Maxim MAX4547ESE, MAX4547EPE, MAX4547EEE, MAX4547CSE, MAX4547CPE Datasheet

_______________General Description

The MAX4545/MAX4546/MAX4547 are low-voltage
T-switches designed for switching RF and video signals
from DC to 300MHz in 50Ω and 75Ω systems. The
MAX4545 contains four normally open single-pole/single­throw (SPST) switches. The MAX4546 contains two dual
SPST switches (one normally open, one normally closed.)
The MAX4547 contains two single-pole/double-throw
(SPDT) switches.

Each switch is constructed in a “T” configuration, ensuring
excellent high-frequency off isolation and crosstalk of

-80dB at 10MHz. They can handle Rail-to-Rail

®

analog sig­nals in either direction. On-resistance (20Ω max) is
matched between switches to 1Ω max and is flat (0.5Ω
max) over the specified signal range, using ±5V supplies.
The off leakage current is less than 5nA at +25°C and
50nA at +85°C.

These CMOS switches can operate with dual power sup­plies ranging from ±2.7V to ±6V or a single supply
between +2.7V and +12V. All digital inputs have 0.8V/2.4V
logic thresholds, ensuring both TTL- and CMOS-logic com­patibility when using ±5V or a single +5V supply.

________________________Applications

RF Switching
Video Signal Routing
High-Speed Data Acquisition
Test Equipment
ATE Equipment
Networking

____________________________Features

♦ Low 50Ω Insertion Loss: -1dB at 100MHz
♦ High 50Ω Off Isolation: -80dB at 10MHz
♦ Low 50Ω Crosstalk: -80dB at 10MHz
♦ DC to 300MHz -3dB Signal Bandwidth
♦ 20Ω Signal Paths with ±5V Supplies
♦ 1Ω Signal-Path Matching with ±5V Supplies
♦ 0.5Ω Signal-Path Flatness with ±5V Supplies
♦ ±2.7V to ±6V Dual Supplies

+2.7V to +12V Single Supply

♦ Low Power Consumption: <1µW
♦ Rail-to-Rail Bidirectional Signal Handling
♦ Pin Compatible with Industry-Standard DG540,

DG542, DG643

♦ >2kV ESD Protection per Method 3015.7
♦ TTL/CMOS-Compatible Inputs

with Single +5V or ±5V

MAX4545/MAX4546/MAX4547

Quad/Dual, Low-Voltage,

Bidirectional RF/Video Switches

________________________________________________________________

Maxim Integrated Products

1

TOP VIEW

16
15
14
13
12
11
10

9

1
2
3
4
5
6
7
8

MAX4546

DIP/SO/QSOP

IN2
COM2
GND2
NO2
V+
NC3
GND3
COM3

N01

GND1

COM1

IN1

COM4

GND4

NC4

V-

20
19
18
17
16
15
14
13

1
2
3
4
5
6
7
8

IN2
COM2
GND2
NO2N01

GND1

COM1

IN1

V+
GND6
N03
GND3GND4

N04

GND5

V-

12
11

9

10

COM3
IN3IN4

COM4

MAX4545

DIP/SO/SSOP

16
15
14
13
12
11
10

9

1
2
3
4
5
6
7
8

MAX4547

DIP/SO/QSOP

N02
V+
GND2
COM2
GND3
V­NC2
IN2

GND1

V-

N01

IN1

NC1

V+

GND4

COM1

MAX4545

SWITCHES SHOWN
FOR LOGIC “0” INPUT

LOGIC SWITCH

0
1

OFF

ON

MAX4547

LOGIC NO-COM

0
1

OFF

ON

NC-COM

ON

OFF

MAX4546

LOGIC 1, 2

0
1

OFF

ON

3, 4

ON

OFF

_____________________Pin Configurations/Functional Diagrams/Truth Tables

19-1232; Rev 0; 6/97

______________Ordering Information

Ordering Information continued at end of data sheet.

For free samples & the latest literature: http://www.maxim-ic.com, or phone [phone]

Rail-to-Rail is a registered trademark of Nippon Motorola Ltd.

PART

MAX4545CPP

MAX4545CWP 0°C to +70°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

20 Plastic DIP
20 Wide SO

MAX4545/MAX4546/MAX4547

Quad/Dual, Low-Voltage,
Bidirectional RF/Video Switches

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS—Dual Supplies

(V+ = +4.5V to +5.5V, V- = -4.5V to -5.5V, V

INL

= 0.8V, V

INH

= 2.4V, V

GND_

= 0V, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical

values are at T

A

= +25°C.)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

(Voltages Referenced to GND)

V+...........................................................................-0.3V, +13.0V

V-............................................................................-13.0V, +0.3V

V+ to V-...................................................................-0.3V, +13.0V

All Other Pins (Note 1)..........................(V- - 0.3V) to (V+ + 0.3V)

Continuous Current into Any Terminal..............................±25mA

Peak Current into Any Terminal

(pulsed at 1ms, 10% duty cycle)..................................±50mA

ESD per Method 3015.7 ..................................................>2000V

Continuous Power Dissipation (T

A

= +70°C) (Note 2)

16-Pin Plastic DIP

(derate 10.53mW/°C above +70°C)..........................842mW

16-Pin Narrow SO

(derate 8.70mW/°C above +70°C)............................696mW

16-Pin QSOP (derate 8.3mW/°C above +70°C).......... 667mW

20-Pin Plastic DIP (derate 8.0mW/°C above +70°C) ...640mW
20-Pin Wide SO (derate 10.00mW/°C above +70°C) .. 800mW

20-Pin SSOP (derate 8.0mW/°C above +70°C) .......... 640mW

Operating Temperature Ranges

MAX454_C_ E.....................................................0°C to +70°C

MAX454_E_ E ..................................................-40°C to +85°C

Storage Temperature Range.............................-65°C to +150°C

Lead Temperature (soldering, 10sec).............................+300°C

Note 1: Voltages on all other pins exceeding V+ or V- are clamped by internal diodes. Limit forward diode current to maximum cur-

rent rating.

V+ = 4.5V, V- = -4.5V,
V

COM_

= ±2V, I

COM_

= 10mA

(Note 3)

V+ = 5.5V, V- = -5.5V,
V

COM_

= ±4.5V, VN_= 4.5V

V+ = 4.5V, V- = -4.5V,
V

COM_

= ±2V, I

COM_

= 10mA

V+ = 5V; V- = -5V; V

COM_

= 1V,

0V, -1V; I

COM

= 10mA

V+ = 5.5V, V- = -5.5V,
V

COM_

= ±4.5V, VN_= 4.5V

V+ = 5.5V, V- = -5.5V,
V

COM_

= ±4.5V, VN_= 4.5V

V

IN_

= 0.8V or 2.4V

CONDITIONS

µA-1 0.03 1I

INH_

, I

INL_

IN_ Input Current Logic High or
Low

Ω

14 20

R

ON

Signal-Path On-Resistance

VV- V+

V

COM_

,

V

NO_,VNC_

Analog Signal Range

V0.8 1.5V

IN_L

IN_ Input Logic Threshold Low

V1.5 2.4V

IN_H

IN_ Input Logic Threshold High

nA

-10 0.04 10

I

COM_(ON)

COM_ On Leakage Current
(Note 6)

Ω

0.5 1

∆R

ON

Signal-Path On-Resistance Match
Between Channels (Note 4)

Ω0.3 0.5R

FLAT(ON)

Signal-Path On-Resistance
Flatness (Note 5)

nA

-5 0.02 5

I

NO_(OFF)

,

I

NC_(OFF)

NO_, NC_ Off Leakage Current
(Note 6)

nA

-5 0.02 5

I

COM_(OFF)

COM_ Off Leakage Current
(Note 6)

UNITS

MIN TYP MAX

(Note 2)

SYMBOLPARAMETER

+25°C

C, E

C, E

C, E

+25°C

+25°C

+25°C
+25°C

+25°C

C, E

T

A

C, E

C, E

C, E -50 50

-50 50

-100 100

C, E

C, E 1.25

18 25

ANALOG SWITCH

LOGIC INPUT

±

±

±

MAX4545/MAX4546/MAX4547

Quad/Dual, Low-Voltage,

Bidirectional RF/Video Switches

_______________________________________________________________________________________ 3

VIN= 5Vp-p, f < 20kHz,
600Ω in and out

Figure 7, RL= 50Ω

V

NO_

= GND, f = 1MHz, Figure 8

CL= 1.0nF, V

NO_

= 0V, RS = 0Ω,

Figure 6

V

COM_

= ±3V, V+ = 5V, V- = -5V,

Figure 5 (Note 3)

V

COM_

= ±3V, V+ = 5V, V- = -5V,

Figure 4

V

COM_

= ±3V, V+ = 5V, V- = -5V,

Figure 4

CONDITIONS

%0.004THD+NDistortion

MHz300BW-3dB Bandwidth

-80

11.5

COM_ Off Capacitance

pF6C

N_(OFF)

NO_, NC_ Off Capacitance

pC60 150Q

Charge Injection
(Note 3)

ns15 40t

BBM

Break-Before-Make Time Delay
(MAX4546/MAX4547 only)

ns

35 100

t

OFF

Turn-Off Time

ns

90 150

t

ON

Turn-On Time

UNITS

MIN TYP MAX

(Note 2)

SYMBOLPARAMETER

V- = -5.5V

V+ = 5.5V, all V

IN_

= 0V or V+

µA

-1 0.05 1

I-V - Supply Current

µA

-1 0.05 1

I+V+ Supply Current

V-6 +6V+, V-Power-Supply Range

+25°C

+25°C

+25°C

+25°C

+25°C

+25°C

+25°C

T

A

+25°C

+25°C

C, E

6

V

COM_

= 0V,
f = 1MHz,
Figure 8

pFC

COM_(OFF)

+25°C

11.5

V

COM_

= V

NO_

= 0V,

f = 1MHz, Figure 8

pF

17

C

COM_(ON)

COM_ On Capacitance +25°C

-80

RL= 50Ω,
V

COM_

= 1V

RMS

,

f = 10MHz, Figure 7

dB

-82

V

ISO

Off Isolation (Note 7) +25°C

MAX4545

MAX4545
MAX4546
MAX4547
MAX4545
MAX4546
MAX4547

C, E -10 10

C, E -10 10

C, E 120

C, E 200

ELECTRICAL CHARACTERISTICS—Dual Supplies (continued)

(V+ = +4.5V to +5.5V, V- = -4.5V to -5.5V, V

INL

= 0.8V, V

INH

= 2.4V, V

GND_

= 0V, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical

values are at T

A

= +25°C.)

MAX4546 6

-88MAX4545
MAX4546
MAX4547

-80

RL= 50Ω, V

COM_

=

1V

RMS

, f = 10MHz,

Figure 7

dB

-84

V

CT

Channel-to-Channel Crosstalk
(Note 8)

+25°C

SWITCH DYNAMIC CHARACTERISTICS

POWER SUPPLY

MAX4545/MAX4546/MAX4547

Quad/Dual, Low-Voltage,
Bidirectional RF/Video Switches

4 _______________________________________________________________________________________

CL= 1.0nF, VNO= 2.5V,
RS= 0Ω, Figure 6

V

COM_

= 3V, V+ = 5V,

Figure 5 (Note 3)

V+ = 4.5V, V

COM_

= 3.5V,

I

COM_

= 1mA

V

COM_

= 3V, V+ = 5V,

Figure 4

(Note 3)

V

COM_

= 3V, V+ = 5V,

Figure 4

V

IN_

= 0.8V or 2.4V

V+ = 5.5V; V

COM_

= 1V, 4.5V

V+ = 5.5V, V

COM_

= 1V,

VN_= 4.5V

V+ = 4.5V, V

COM_

= 3.5V,

I

COM_

= 1mA

V+ = 5.5V, V

COM_

= 1V,

VN_= 4.5V

CONDITIONS

pC25QCharge Injection

ns20 70t

BBM

Break-Before-Make Time Delay
(MAX4546/MAX4547 only)

ns

150

40 100

t

OFF

Turn-Off Time

ns

350

130 250

t

ON

Turn-On Time

µA-1 0.03 1I

INH_

, I

INL_

IN_ Input Current Logic High or
Low

V0.8 1.5V

IN_L

IN_ Input Logic Threshold Low

V1.5 2.4V

IN_H

IN_ Input Logic Threshold High

nA

-100 100

26 40

R

ON

Signal-Path On-Resistance

V0 V+

V

COM_

,

V

NO_

, V

NC_

Analog Signal Range

-10 0.04 10

I

COM_(ON)

COM_ On Leakage Current
(Note 9)

nA

-50 50

-5 0.02 5

I

COM_(OFF)

COM_ Off Leakage Current
(Note 9)

nA

-50 50

Ω

60

2

∆R

ON

Signal-Path On-Resistance
Match

Ω

4

-5 0.02 5

I

NO_(OFF)

,

I

NC_(OFF)

NO_, NC_ Off Leakage Current
(Note 9)

UNITS

MIN TYP MAX

(Note 2)

SYMBOLPARAMETER

+25°C

+25°C

+25°C

C, E

+25°C

+25°C

C, E

+25°C

C, E

+25°C

C, E

C, E

C, E

+25°C

C, E

C, E

+25°C

C, E

+25°C

C, E

T

A

ELECTRICAL CHARACTERISTICS—Single +5V Supply

(V+ = +4.5V to +5.5V, V- = 0V, V

INL

= 0.8V, V

INH

= 2.4V, V

GND_

= 0V, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are

at T

A

= +25°C.)

V+ = 5.5V, all V

IN_

= 0V or V+

-1 0.05 1

I+V+ Supply Current µA

-10 10

+25°C

C, E

RL= 50Ω, V

COM_

= 1V

RMS

,

f = 10MHz, Figure 7

dB-75V

ISO

Off-Isolation
(Note 7)

+25°C

RL= 50Ω, V

COM_

= 1V

RMS

,

f = 10MHz, Figure 7

dB-70V

CT

Channel-to-Channel Crosstalk
(Note 8)

+25°C

ANALOG SWITCH

LOGIC INPUT

SWITCH DYNAMIC CHARACTERISTICS

POWER SUPPLY

V+ Supply Current

MAX4545/MAX4546/MAX4547

Quad/Dual, Low-Voltage,

Bidirectional RF/Video Switches

_______________________________________________________________________________________ 5

ELECTRICAL CHARACTERISTICS—Single +3V Supply

(V+ = +2.7V to +3.6V, V- = 0V, V

INL

= 0.8V, V

INH

= 2.4V, V

GND_

= 0V, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are

at T

A

= +25°C.)

V+ = 2.7V, V

COM_

= 1V,

I

COM_

= 1mA

(Note 3)

V+ = 3.6V, all V

IN_

= 0V or V+

V

COM_

= 1.5V, V+ = 2.7V,

Figure 4 (Note 3)

V

COM_

= 1.5V, V+ = 2.7V,

Figure 5 (Note 3)

V

IN_

= 0.8V or 2.4V (Note 3)

(Note 3)
(Note 3)

V

COM_

= 1.5V, V+ = 2.7V,

Figure 4 (Note 3)

CONDITIONS

µA

-1 0.05 1

I+V+ Supply Current

ns15 100t

BBM

Break-Before-Make Time Delay
(MAX4546/MAX4547 only)

ns

200

50 150

t

OFF

Turn-Off Time

70 120

R

ON

Signal-Path On-Resistance

V0 V+

V

COM_

,

V

NO_

, V

NC_

Analog Signal Range

ns

800

300 600

t

ON

Turn-On Time

µA-1 1I

INH_

, I

INL_

IN_ Input Current Logic High or
Low

Ω

150

V1.0 2.4V

IN_H

IN_ Input Logic Threshold High

V0.8 1.0V

IN_L

IN_ Input Logic Threshold Low

UNITS

MIN TYP MAX

(Note 2)

SYMBOLPARAMETER

+25°C

+25°C

+25°C

C, E

+25°C

+25°C

C, E

C, E

C, E

C, E

C, E

+25°C

T

A

-10 10C, E

ANALOG SWITCH

LOGIC INPUT

SWITCH DYNAMIC CHARACTERISTICS

POWER SUPPLY

Note 2: The algebraic convention is used in this data sheet; the most negative value is shown in the minimum column.
Note 3: Guaranteed by design.
Note 4: ∆R

ON

= ∆R

ON(MAX)

- ∆R

ON(MIN)

.

Note 5: Resistance flatness is defined as the difference between the maximum and the minimum value of on-resistance as mea-

sured over the specified analog signal range.

Note 6: Leakage parameters are 100% tested at the maximum rated hot temperature and guaranteed by correlation at +25°C.
Note 7: Off isolation = 20log

10[VCOM

/ (VNCor VNO)], V

COM

= output, VNCor VNO= input to off switch.

Note 8: Between any two switches.
Note 9: Leakage testing for single-supply operation is guaranteed by testing with dual supplies.

MAX4545/MAX4546/MAX4547

Quad/Dual, Low-Voltage,
Bidirectional RF/Video Switches

6 _______________________________________________________________________________________

__________________________________________Typical Operating Characteristics

(V+ = +5V, V- = -5V, TA= +25°C, GND = 0V, packages are surface mount, unless otherwise noted.)

100

10

-5 0 1 2 3 4-4 -3 -2 -1 5

ON-RESISTANCE vs. V

COM

(DUAL SUPPLIES)

MAX4545 TOC01

V

COM

(V)

R

ON

(Ω)

V+, V- = 1.2V, -1.2V

V+, V- = 2V, -2V

V+, V- = 5V, -5V

V+, V- = 3.3V, -3.3V

V+, V- =

2.7V, -2.7V

5

11

13

15

9
7

17

23

19

21

25

-5 -3 -2-4 -1 0 1 2 3 4 5

ON-RESISTANCE vs. V

COM

AND TEMPERATURE

(DUAL SUPPLIES)

MAX4545 TOC03

V

COM

(V)

R

ON

(Ω)

TA = -55°C

T

A

= +85°C

TA = 0°C

TA = +25°C

TA = +125°C

1000

10

100

10 2 3 4 5 6 7 8 9 10

ON-RESISTANCE vs. V

COM

(SINGLE SUPPLY)

MAX4545 TOC02

V

COM

(V)

R

ON

(Ω)

V- = 0V

V+ = 10V

V+ = 7.5V

V+ = 5V

V+ = 3.3V

V+ = 2.7V

V+ = 2V

10

20

25

15

30

40

35

45

0 1.0 1.50.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0

ON-RESISTANCE vs. V

COM

AND TEMPERATURE

(SINGLE SUPPLY)

MAX4545 TOC04

V

COM

(V)

R

ON

(Ω)

TA = 0°C

TA = +25°C

TA = +125°C

TA = -55°C

TA = +85°C

0

50

100

150

200

250

±2 ±3 ±4 ±5 ±6 ±8

ON/OFF TIME vs.

SUPPLY VOLTAGE

MAX4545 TOC07

V+, V- (V)

t

ON,

t

OFF

(ns)

t

ON

t

OFF

0.0001

0.001

0.01

0.1

1

10

-75 -50 -25 0 25 7550 100 125

ON/OFF-LEAKAGE CURRENT vs.

TEMPERATURE

MAX4545 TOC05

TEMPERATURE (°C)

LEAKAGE (nA)

ON/OFF LEAKAGE

-20

20

40

0

60

100

80

120

-5 -3 -2-4 -1 0 1 2 3 4 5

CHARGE INJECTION vs. V

COM

MAX4545 TOC06

V

COM

(V)

Q

j

(pC)

DUAL

SUPPLIES

SINGLE

SUPPLY

10

30

50

70

90

110

20

40

60

80

100

-75 -25 0 75 125-50 25 50 100

ON/OFF TIME vs.

TEMPERATURE

MAX4545 TOC08

TEMPERATURE (°C)

t

ON,

t

OFF

(ns)

t

ON

t

OFF

0.00001

0.0001

0.001

I-

I+

0.01

0.1

1

-75 -25 0 75 125-50 25 50 100

POWER-SUPPLY CURRENT

vs. TEMPERATURE

MAX4545 TOC09

TEMPERATURE (°C)

I+, I- (µA)

MAX4545/MAX4546/MAX4547

Quad/Dual, Low-Voltage,

Bidirectional RF/Video Switches

_______________________________________________________________________________________

7

0

0.4

0.2

0.6

1.2

1.4

1.0

0.8

1.6

0 1.0 1.5 2.0 2.50.5 3.0 3.5 4.0 4.5 5.0

LOGIC-LEVEL THRESHOLD

vs. POSITIVE SUPPLY VOLTAGE

MAX4545 TOC10

V+ (V)

LOGIC-LEVEL THRESHOLD (V)

0

-120

0.1 10 10001001

MAX4545

FREQUENCY RESPONSE

-100

-110

MAX14545 TOC11

FREQUENCY (MHz)

LOSS (dB)

-80

-90

-60

-50

-70

-40

-20

-10

-30

V+ = +5V
V- = -5V
5VΩ INPUT
50Ω OUTPUT

INSERTION LOSS

OFF ISOLATION

CROSSTALK

0

-100
1 10 100 1000

MAX4546

FREQUENCY RESPONSE

-60

-70

-80

-90

-30

-40

-50

-20

-10

MAX4545 TOC12

FREQUENCY (MHz)

LOSS (dB)

V+ = +5V
V- = -5V
5VΩ INPUT
50 Ω OUTPUT

OFF ISOLATION

CROSSTALK

INSERTION

LOSS

10

0

-20

-10

-100
1 10 1000

FREQUENCY RESPONSE

-70

-80

-90

-30

-40

-50

-60

100

60

80

-100

-40

-60

-80

40
20
0

-20

MAX4545 TOC13

FREQUENCY (MHz)

SWITCH LOSS (dB)

ON PHASE (DEGREES)

100

ON LOSS

ON PHASE

OFF ISOLATION

CROSSTALK

100

0.0001
10 1k 100k10k100

MAX4547

TOTAL HARMONIC DISTORTION

vs. FREQUENCY

0.001

MAX14545 TOC14

FREQUENCY (Hz)

THD (%)

0.01

0.1

1

10

V+ = +5V
V- = -5V
5Vp-p SIGNAL
600Ω SOURCE AND LOAD

____________________________Typical Operating Characteristics (continued)

(V+ = +5V, V- = -5V, TA= +25°C, GND = 0V, packages are surface mount, unless otherwise noted.)

_______________Theory of Operation

Logic-Level Translators

The MAX4545/MAX4546/MAX4547 are constructed as
high-frequency “T” switches, as shown in Figure 1. The
logic-level input, IN_, is translated by amplifier A1 into a
V+ to V- logic signal that drives amplifier A2. (Amplifier
A2 is an inverter for normally closed switches.)
Amplifier A2 drives the gates of N-channel MOSFETs
N1 and N2 from V+ to V-, turning them fully on or off.
The same signal drives inverter A3 (which drives the
P-channel MOSFETs P1 and P2) from V+ to V-, turning
them fully on or off, and drives the N-channel MOSFET
N3 off and on.

The logic-level threshold is determined by V+ and
GND_. The voltage on GND_ is usually at ground
potential, but it may be set to any voltage between
(V+ - 2V) and V-. When the voltage between V+ and
GND_ is less than 2V, the level translators become very
slow and unreliable. Since individual switches in each
package have individual GND_ pins, they may be set to
different voltages. Normally, however, they should all
be connected to the ground plane.

Switch On Condition

When the switch is on, MOSFETs N1, N2, P1, and P2
are on and MOSFET N3 is off. The signal path is COM_
to NO_, and because both N-channel and P-channel
MOSFETs act as pure resistances, it is symmetrical

(i.e., signals may pass in either direction). The off
MOSFET, N3, has no DC conduction, but has a small
amount of capacitance to GND_. The four on
MOSFETs also have capacitance to ground that,
together with the series resistance, forms a lowpass fil­ter. All of these capacitances are distributed evenly
along the series resistance, so they act as a transmis­sion line rather than a simple R-C filter. This helps to
explain the exceptional 300MHz bandwidth when the
switches are on.

MAX4545/MAX4546/MAX4547

Quad/Dual, Low-Voltage,
Bidirectional RF/Video Switches

8 _______________________________________________________________________________________

______________________________________________________________Pin Description

NAME FUNCTION*

MAX4545

1, 10, 11,

20

IN_ Digital Control Input

PIN

3, 6, 8, 13,

15, 18

GND_

RF and Logic Ground. Grounds are not internally connected to each other,
and should all be connected to a ground plane (see

Grounding

section).

16 V+ Positive Supply-Voltage Input (analog and digital)

2, 9, 12, 19 COM_ Analog Switch Common** Terminals

— NC_ Analog Switch Normally Closed** Terminals

4, 7, 14, 17 NO_ Analog Switch Normally Open** Terminals

5 V-

Negative Supply-Voltage Input. Connect to ground plane for single-supply
operation.

MAX4546

1, 16

3, 7, 10, 14

12

2, 8, 9, 15

6, 11

4, 13

5

MAX4547

1, 9

4, 6, 12, 14

7, 15

5, 13

8, 10

2, 16

3, 11

* All pins have ESD diodes to V- and V+.
** NO_ (or NC_) and COM_ pins are identical and interchangeable. Either may be considered as an input or output; signals pass

equally well in either direction.

A1 A2 A3

A1

(NC)

S

S

P1

N3

D

D

D

N1

V-

GND_

IN_

V+

V+

V+

COM_ NO_

S D

N2

S

S

P2

D

NORMALLY OPEN SWITCH CONSTRUCTION

COM_ - NO_IN_

0
1

OFF

ON

BSD DIODES

ON GND_, IN_,

COM_, NO_, AND NC_

Figure 1. T-Switch Construction

Typical attenuation in 50Ω systems is -1dB and is rea­sonably flat up to 100MHz. Higher-impedance circuits
show even lower attenuation (and vice versa), but
slightly lower bandwidth due to the increased effect of
the internal and external capacitance and the switch’s
internal resistance.

The MAX4545/MAX4546/MAX4547 are optimized for
±5V operation. Using lower supply voltages or a single
supply increases switching time, increases on-resis­tance (and therefore on-state attenuation), and increas­es nonlinearity.

Switch Off Condition

When the switch is off, MOSFETs N1, N2, P1, and P2
are off and MOSFET N3 is on. The signal path is
through the off-capacitances of the series MOSFETs,
but it is shunted to ground by N3. This forms a high­pass filter whose exact characteristics are dependent
on the source and load impedances. In 50Ω systems,
and below 10MHz, the attenuation can exceed 80dB.
This value decreases with increasing frequency and
increasing circuit impedances. External capacitance
and board layout have a major role in determining over­all performance.

__________Applications Information

Power-Supply Considerations

Overview

The MAX4545/MAX4546/MAX4547 construction is typi­cal of most CMOS analog switches. It has three supply
pins: V+, V-, and GND. V+ and V- are used to drive the
internal CMOS switches and set the limits of the analog
voltage on any switch. Reverse ESD protection diodes
are internally connected between each analog signal
pin and both V+ and V-. If the voltage on any pin
exceeds V+ or V-, one of these diodes will conduct.
During normal operation these reverse-biased ESD
diodes leak, forming the only current drawn from V-.

Virtually all the analog leakage current is through the
ESD diodes. Although the ESD diodes on a given sig­nal pin are identical, and therefore fairly well balanced,
they are reverse biased differently. Each is biased by
either V+ or V- and the analog signal. This means their
leakages vary as the signal varies. The

difference

in the
two diode leakages from the signal path to the V+ and
V- pins constitutes the analog signal-path leakage cur­rent. All analog leakage current flows to the supply ter­minals, not to the other switch terminal. This explains
how both sides of a given switch can show leakage
currents of either the same or opposite polarity.

There is no connection between the analog signal
paths and GND. The analog signal paths consist of an

N-channel and P-channel MOSFET with their sources
and drains paralleled and their gates driven out of
phase with V+ and V- by the logic-level translators.

V+ and GND power the internal logic and logic-level
translators, and set the input logic thresholds. The
logic-level translators convert the logic levels to
switched V+ and V- signals to drive the gates of the
analog switches. This drive signal is the only connec­tion between the logic supplies and the analog sup­plies. All pins have ESD protection to V+ and to V-.

Increasing V- has no effect on the logic-level thresh­olds, but it does increase the drive to the P-channel
switches, reducing their on-resistance. V- also sets the
negative limit of the analog signal voltage.

The logic-level thresholds are CMOS and TTL compati­ble when V+ is +5V. As V+ is raised, the threshold
increases slightly; when V+ reaches +12V, the level
threshold is about 3.1V, which is above the TTL output
high-level minimum of 2.8V, but still compatible with
CMOS outputs.

Bipolar-Supply Operation

The MAX4545/MAX4546/MAX4547 operate with bipolar
supplies between ±2.7V and ±6V. The V+ and V- sup­plies need not be symmetrical, but their sum cannot
exceed the absolute maximum rating of 13.0V. Do not

connect the MAX4545/MAX4546/MAX4547 V+ pin to
+3V and connect the logic-level input pins to TTL
logic-level signals. TTL logic-level outputs can
exceed the absolute maximum ratings, causing
damage to the part and/or external circuits.

CAUTION:

The absolute maximum V+ to V- differential
voltage is 13.0V. Typical “±6-Volt” or “12-Volt”
supplies with ±10% tolerances can be as high
as 13.2V. This voltage can damage the
MAX4545/MAX4546/MAX4547. Even ±5% toler­ance supplies may have overshoot or noise
spikes that exceed 13.0V.

Single-Supply Operation

The MAX4545/MAX4546/MAX4547 operate from a sin­gle supply between +2.7V and +12V when V- is con­nected to GND. All of the bipolar precautions must be
observed. Note, however, that these parts are opti­mized for ±5V operation, and most AC and DC charac­teristics are degraded significantly when departing
from ±5V. As the overall supply voltage (V+ to V-) is
lowered, switching speed, on-resistance, off isolation,
and distortion are degraded. (See

Typical Operating

Characteristics

.)

MAX4545/MAX4546/MAX4547

Quad/Dual, Low-Voltage,

Bidirectional RF/Video Switches

_______________________________________________________________________________________ 9

MAX4545/MAX4546/MAX4547

Single-supply operation also limits signal levels and
interferes with grounded signals. When V- = 0V, AC sig­nals are limited to -0.3V. Voltages below -0.3V can be
clipped by the internal ESD-protection diodes, and the
parts can be damaged if excessive current flows.

Power Off

When power to the MAX4545/MAX4546/MAX4547 is off
(i.e., V+ = 0V and V- = 0V), the Absolute Maximum
Ratings still apply. This means that neither logic-level
inputs on IN_ nor signals on COM_, NO_, or NC_ can
exceed ±0.3V. Voltages beyond ±0.3V cause the inter­nal ESD-protection diodes to conduct, and the parts
can be damaged if excessive current flows.

Grounding

DC Ground Considerations

Satisfactory high-frequency operation requires that
careful consideration be given to grounding. For most

applications, a ground plane is strongly recom­mended, and all GND_ pins should be connected to
it with solid copper. While the V+ and V- power-supply

pins are common to all switches in a given package,
each switch has separate ground pins that are not
internally connected to each other. This contributes to
the overall high-frequency performance and provides
added flexibility in some applications, but it can cause
problems if it is overlooked. All the GND_ pins have
ESD diodes to V+ and V-.

In systems that have separate digital and analog (sig­nal) grounds, connect these switch GND_ pins to ana­log ground. Preserving a good signal ground is much
more important than preserving a digital ground.
Ground current is only a few nanoamps.

The logic-level inputs, IN_, have voltage thresholds
determined by V+ and GND_. (V- does not influence
the logic-level threshold.) With +5V and 0V applied to
V+ and GND_, the threshold is about 1.6V, ensuring
compatibility with TTL- and CMOS-logic drivers.

The various GND_ pins can be connected to separate
voltage potentials if any or all of the logic-level inputs is
not a normal logic signal. (The GND_ voltages cannot
exceed (V+ - 2V) or V-.) Elevating GND_ reduces off
isolation. For example, using the MAX4545, if GND2–
GND6 are connected to 0V and GND1 is connected to
V-, then switches 2, 3, and 4 would be TTL/CMOS com­patible, but switch 1 (IN1) could be driven with the rail­to-rail output of an op amp operating from V+ and V-.
Note, however, that IN_ can be driven more negative
than GND_, as far as V-. GND_ does not have to be
removed from 0V when IN_ is driven from bipolar
sources, but the voltage on IN_ should never exceed V-.

GND_ should be separated from 0V only if the logic­level threshold has to be changed.

Any GND_ pin not connected to 0V should be
bypassed to the ground plane with a surface-mount
10nF capacitor to maintain good RF grounding. DC
current in the IN_ and GND_ pins is less than 1nA, but
increases with switching frequency.

On the MAX4545 only, two extra ground pins—GND5
and GND6—are provided to improve isolation and
crosstalk. They are not connected to the logic-level cir­cuit. These pins should always be connected to the
ground plane with solid copper.

AC Ground and Bypassing

A ground plane is mandatory for satisfactory high­frequency operation. (Prototyping using hand wiring or

wire-wrap boards is strongly discouraged.) Connect all
0V GND_ pins to the ground plane with solid copper.
(The GND_ pins extend the high-frequency ground
through the package wire-frame, into the silicon itself,
thus improving isolation.) The ground plane should be
solid metal underneath the device, without interruptions.
There should be no traces under the device itself. For
DIP packages, this applies to both sides of a two-sided
board. Failure to observe this will have a minimal effect
on the “on” characteristics of the switch at high frequen­cies, but it will degrade the off isolation and crosstalk.

All V+ and V- pins should be bypassed to the ground
plane with surface-mount 10nF capacitors. For DIP
packages, they should be mounted as close as possi­ble to the pins on the same side of the board as the
device. Do not use feedthroughs or vias for bypass
capacitors. For surface-mount packages, the pins are
so close to each other that the bypass capacitors
should be mounted on the opposite side of the board
from the device. In this case, use short feedthroughs or
vias, directly under the V+ and V- pins. Any GND_ pin
not connected to 0V should be similarly bypassed. If V­is 0V, connect it directly to the ground plane with solid
copper. Keep all leads short.

The MAX4547 has two V+ and V- pins. Make DC con­nections to only one of each to minimize crosstalk. Do
not route DC current into one of the V+ or V- pins and
out the other V+ or V- pin to other devices. The second
set of V+ and V- pins is for AC bypassing only.

For dual-supply operation, the MAX4547 should have
four 10nF bypass capacitors connected to each V+
and V- pin, as close to the package as possible. For
single-supply operation, the MAX4547 should have two
10nF bypass capacitors connected (one to each V+
pin), as close to the package as possible.

Quad/Dual, Low-Voltage,
Bidirectional RF/Video Switches

10 ______________________________________________________________________________________

MAX4545/MAX4546/MAX4547

Quad/Dual, Low-Voltage,

Bidirectional RF/Video Switches

______________________________________________________________________________________ 11

On the MAX4545, GND5 and GND6 should always be
connected to the ground plane with solid copper to
improve isolation and crosstalk.

Signal Routing

Keep all signal leads as short as possible. Separate all
signal leads from each other and other traces with the
ground plane on both sides of the board. Where possi­ble, use coaxial cable instead of printed circuit board
traces.

Board Layout

IC sockets degrade high-frequency performance and
should not be used if signal bandwidth exceeds 5MHz.
Surface-mount parts, having shorter internal lead
frames, provide the best high-frequency performance.
Keep all bypass capacitors close to the device, and
separate all signal leads with ground planes. Such
grounds tend to be wedge-shaped as they get closer to
the device. Use vias to connect the ground planes on
each side of the board, and place the vias in the apex of
the wedge-shaped grounds that separate signal leads.
Logic-level signal lead placement is not critical.

Impedance Matching

The typical on-resistances of the switches in the
MAX4545/MAX4546/MAX4547 are 14Ω, but the off­state impedances are approximately equal to a 6pF
capacitor. In coaxial systems, therefore, it is impossible
to match any impedance for both the on and off state. If
impedance matching is critical, the MAX4546 is best
suited, since its two sections can be configured as a
single on/off switch, as shown in Figure 2. This circuit
“wastes” switches and has higher losses, but has bet­ter off isolation and maintains good impedance match­ing in both the on and off states. The resistance values
shown in Figure 3 are optimized with ±5V supplies for
both 50Ω and 75Ω systems at room temperature.

Multiplexer

With its excellent off isolation, the MAX4545 is ideal for
use in high-frequency video multiplexers. Figure 3
shows such an application for switching any one of four
video inputs to a single output. The same circuit may
be used as a demultiplexer by simply reversing the sig­nal direction.

Stray capacitance of traces and the output capacitance
of switches placed in parallel reduces bandwidth, so the
outputs of no more than four individual switches should
be placed in parallel if high bandwidth is to be main­tained. If more than four mux channels are needed, the
4-channel circuit should be duplicated and cascaded.

COM1

GND1

GND1

NC4

NO1

GND4
COM4

NC3

NO2

COM2

GND2

IN2

GND3

COM3

IN1

1

3

4
6

7

8

14

15

16

12

13
11

10

9

5

V-

V-

10nF

38Ω

(61Ω)

38Ω
(61Ω)

50Ω

OUT/IN

82Ω
(194Ω)

50Ω

IN/OUT

LOGIC

IN

2

V+

V+

10nF

SWITCHES SHOWN FOR LOGIC “0” INPUT
( ) ARE FOR 75 SYSTEMS.

SWITCHLOGIC

0
1

OFF

ON

MAX4546

Figure 2. Impedance Matching On/Off Switch

MAX4545/MAX4546/MAX4547

Quad/Dual, Low-Voltage,
Bidirectional RF/Video Switches

12 ______________________________________________________________________________________

MAX4545

MAX4545

MAX4545

MAX4545

GND6
COM1

COM2

COM3

COM4

GND1

NO1

NO2

NO3

NO4

50/75Ω
OUT/IN

50/75Ω
OUT/IN

GND5

V-

V-

10nF

V+

V+

2 TO 4 CHANNELS

MORE THAN 4 CHANNELS

10nF

GND2

GND3

GND4

IN1

IN1

IN2

IN2

IN3

IN3

IN4

IN4

1 OUT
2

3
4

1

2

3

4

1

OUT

TO

ADDITIONAL

MUXES

2

3
4

5

6

7

8

1 OUT
2

3
4

ADDRESS

DECODING

Figure 3. 4-Channel Multiplexer

MAX4545/MAX4546/MAX4547

Quad/Dual, Low-Voltage,

Bidirectional RF/Video Switches

______________________________________________________________________________________ 13

50% 50%

t

OFF

t

ON

V+

0V

V

IN_

V

OUT

V

OUT

V+

IN_

NO_OR NC_

COM_

3V

REPEAT TEST FOR EACH SWITCH.

50Ω

MAX4545
MAX4546
MAX4547

RL = 50Ω

90%

90%

ALL GND_ PINS ARE CONNECTED TO GROUND PLANE (OV).
V- IS CONNECTED TO GND (OV) FOR SINGLE-SUPPLY OPERATION.

0V

V

IN_

+5V

10nF

GND_ V-

10nF

-5V

Figure 4. Switching Time

______________________________________________Test Circuits/Timing Diagrams

50%

t

BBM

tR < 20ns
tF < 20ns

V+

0V

V

IN_

V

OUT

V

OUT

V+

IN_

* COM2

* COM3

* NC3

* N02

3V

* REPEAT TEST FOR OTHER PAIR OF SWITCHES.

50Ω

MAX4546

RL = 50Ω

80%

ALL GND_ PINS ARE CONNECTED TO GROUND PLANE (OV).
V+ IS CONNECTED TO GND (OV) FOR SINGLE-SUPPLY OPERATION.

0V

V

IN_

+5V10nF

GND_ V-

10nF

-5V

V

OUT

V+

IN_

**NO_

**NC_

**COM_

1V

** REPEAT TEST FOR OTHER SWITCH.

50Ω

MAX4547

RL = 50Ω

V

IN_

-+5V10nF

GND_ V-

10nF

-5V

Figure 5. Break-Before-Make Interval (MAX4546/MAX4547 only)

MAX4545/MAX4546/MAX4547

Quad/Dual, Low-Voltage,
Bidirectional RF/Video Switches

14 ______________________________________________________________________________________

∆V

OUT

V+

0V

V

IN_

V

OUT

∆V

OUT

IS THE MEASURED VOLTAGE DUE TO CHARGE TRANSFER

ERROR Q WHEN THE CHANNEL TURNS OFF.
Q = ∆V

OUT x CL

V

OUT

V+

IN_

NO_ OR NC_

COM_

V

NO

= 0V

V- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION.

50Ω

MAX4545
MAX4546
MAX4547

CL = 1000pF

V

IN_

+5V

10nF

GND_ V-

10nF

-5V

Figure 6. Charge Injection

MEASUREMENTS ARE STANDARDIZED AGAINST SHORT AT IC TERMINALS.
OFF ISOLATION IS MEASURED BETWEEN COM_ AND "OFF" NO_ OR NC_ TERMINAL ON EACH SWITCH.
ON LOSS IS MEASURED BETWEEN COM_ AND "ON" NO_ OR NC_TERMINAL ON EACH SWITCH.
CROSSTALK IS MEASURED FROM ONE CHANNEL TO ALL OTHER CHANNELS.
SIGNAL DIRECTION THROUGH SWITCH IS REVERSED; WORST VALUES ARE RECORDED.
V- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION.

+5V

V

OUT

V+

IN_

NO_

COM_

V

IN

MAX4545
MAX4546
MAX4547

OFF ISOLATION = 20log

V

OUT

V

IN

ON LOSS = 20log

V

OUT

V

IN

CROSSTALK = 20log

V

OUT

V

IN

NETWORK

ANALYZER

50Ω

50Ω 50Ω

50Ω

MEAS REF

10nF

0V OR V+

GND_ V-

10nF

-5V

Figure 7. On Loss, Off Isolation, and Crosstalk

_________________________________Test Circuits/Timing Diagrams (continued)

MAX4545/MAX4546/MAX4547

Quad/Dual, Low-Voltage,

Bidirectional RF/Video Switches

______________________________________________________________________________________ 15

N.C. = NO INTERNAL CONNECTION TRANSISTOR COUNT: 253

SUBSTRATE INTERNALLY CONNECTED TO V-

GND2

GND5

GND4

NO4

V-

NO1

COM3

0.101"

(2.565mm)

0.085"

(2.159mm)

COM4 IN4 IN3

GND6

V+

NO2

N.C.

NO3

GND3

COM1 IN1 IN2 COM2

GND1

N.C.

MAX4545

GND2

GND4

N.C.

COM1

N.C.

N.C.

NC2

0.101"

(2.565mm)

0.085"

(2.159mm)

V+ NC1 IN2

COM2

N.C.

N.C.

V-

N.C.

GND3

NO1 IN1 IN2 V+

GND1

V-

MAX4547

GND2

N.C.

N.C.

NC4

V-

NO1

GND3

0.101"

(2.565mm)

MAX4546

GND4 COM4 COM3

N.C.

V+

NO2

N.C.

NC3

0.085"

(2.159mm)

COM1 IN1 IN2 COM2

GND1

N.C.

+5V10nF

0V OR V+

V+

IN_

ALL GND_ PINS ARE CONNECTED TO GROUND PLANE (0V).

NO_
NC_

COM_

MAX4545
MAX4546
MAX4547

1MHz

CAPACITANCE

ANALYZER

GND_ V-

10nF

-5V

Figure 8. NO_, NC_, COM_ Capacitance

_________________Chip Topographies

Test Circuits/Timing

______________Diagrams (continued)

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

16

__________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 [phone]

© 1997 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

MAX4545/MAX4546/MAX4547

Quad/Dual, Low-Voltage,
Bidirectional RF/Video Switches

________________________________________________________Package Information

QSOP.EPS

PART

MAX4545CAP 0°C to +70°C

TEMP. RANGE PIN-PACKAGE

20 SSOP
MAX4545C/D
MAX4545EPP
MAX4545EWP -40°C to +85°C

-40°C to +85°C

0°C to +70°C Dice*

20 Plastic DIP

20 Wide SO
MAX4545EAP
MAX4546CPE
MAX4546CSE 0°C to +70°C

0°C to +70°C

-40°C to +85°C 20 SSOP
16 Plastic DIP
16 Narrow SO

MAX4546CEE
MAX4546C/D
MAX4546EPE -40°C to +85°C

0°C to +70°C

0°C to +70°C 16 QSOP

Dice*
16 Plastic DIP

MAX4546ESE -40°C to +85°C 16 Narrow SO

___________________________________________Ordering Information (continued)

*

Contact factory for dice specifications.

PART TEMP. RANGE PIN-PACKAGE

MAX4546EEE
MAX4547CPE

0°C to +70°C

-40°C to +85°C 16 QSOP
16 Plastic DIP

MAX4547CSE
MAX4547CEE
MAX4547C/D 0°C to +70°C

0°C to +70°C

0°C to +70°C 16 Narrow SO

16 QSOP
Dice*

MAX4547EPE
MAX4547ESE
MAX4547EEE -40°C to +85°C

-40°C to +85°C

-40°C to +85°C 16 Plastic DIP
16 Narrow SO
16 QSOP