MAXIM MAX4670 Technical data

General Description

The MAX4670 is an integrated T1/E1/J1 analog protec­tion switch for 1+1 and N+1 line-card redundancy
applications. It protects two T1/E1/J1 ports by combin­ing eight SPDT switches in a single package. The
switch is optimized for high-return loss and pulse-tem­plate performance in T1/E1/J1 long-haul and short-haul
applications. The part offers built-in chip-side surge
protection capability for short-haul intrabuilding appli­cations.

The MAX4670 replaces two diode arrays or two tran­sient voltage suppressors (TVSs) and four dual-SPDT
relays, significantly reducing board space and simplify­ing PC board routing. The MAX4670 pinout is targeted
for T1/E1/J1 applications, resulting in a simplified layout
when interfacing with standard line transformers and
line interface units (LIUs).

The MAX4670 has four 1.0Ω (max) on-resistance switch­es with 60pF/40pF on-/off-capacitances for interfacing to
the LIU transmitter outputs. The MAX4670 also includes
four 10Ω (max) on-resistance switches with low
24pF/12pF on-/off-capacitances for interfacing to the LIU
receiver inputs. Four logic inputs control the receive/
transmit pairs, in addition to a SWITCH input that con­nects all switches to the system’s protection bus.

The MAX4670 operates from a single +2.7V to +3.6V
supply and is available in 32-pin thermally enhanced
TQFN package. The MAX4670 is specified over the

-40°C to +85°C operating temperature range.

Applications

Optical Multiplexers (ADMs, M13s, etc.)

Edge Routers

Multiservice Switches

Base Station Controllers (Wireless Infrastructure
Equipment)

Media Gateways (VoIP)

Features

♦ Single +3.3V Supply Voltage

♦ Quad-DPDT/Octal-SPDT Switches Support

Two T1/E1/J1 Ports

♦ Low R

ON

♦ 0.7Ω (typ) in Transmit Path; 5Ω (typ) in

Receive Path

♦ Low CON/C

OFF

60pF/40pF (typ) in Transmit Path
24pF/12pF (typ) in Receive Path

♦ Chip Surge Protection

IEC 61000-4-5 (8µs to 20µs Surge)
Class 2 (±1kV)

♦ -70dB (typ) Crosstalk/Off-Isolation (3MHz)

♦ Small, 32-Pin TQFN Package

MAX4670

Integrated T1/E1/J1 Short-Haul and

Long-Haul Protection Switch

________________________________________________________________ Maxim Integrated Products 1

19-3798; Rev 0; 09/06

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

TOP VIEW

1

INB

2

COM33COM4

4

GND

5

INC

6

COM57COM6

8

SWITCH

24

NC323NO322NC421NO420NC519NO518NC617NO6

9

V+

10

IND

11

COM7

12

COM8

13

NO8

14

NC8

15

NO7

16

NC7

32

V+

31

INA

30

COM2

29

COM1

28

NC1

27

NO1

26

NC2

25

NO2

MAX4670

*EP

TQFN

*NOTE:
EXPOSED PADDLE
CONNECTED TO GND

Pin Configuration

Ordering Information

PART*

PIN­PACKAGE

SURGE

PKG

CODE

MAX4670ETJ

32 TQFN

YES T3255-4

*This part operates at a -40°C to +85°C temperature range.

Functional Diagram/Truth Table appears at end of data sheet.

PROTECTION

(5mm x 5mm)

MAX4670

Integrated T1/E1/J1 Short-Haul and
Long-Haul Protection Switch

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

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.

(All voltages referenced to GND.)

V+, IN_, SWITCH ......................................................-0.3V to +4V

COM_, NO_, NC_ (Note 1) ...........................-0.3V to (V+ + 0.3V)

Continuous Current

NO_, NC_, COM_ (Tx interface)..................................±150mA

NO_, NC_, COM_ (Rx interface) .................................±100mA

Peak Currents

NO_, NC_, COM_ (Tx interface)

(pulsed at 1ms, 10% duty cycle) ................................±300mA

NO_, NC_, COM_ (Rx interface)

(pulsed at 1ms, 10% duty cycle) ................................±200mA

Peak Surge Currents

Poised at 8µs ..................................................................21.4A

Poised at 20µs ................................................................11.9A

Continuous Power Dissipation (T

A

= +70°C)

32-Pin TQFN (derate 21.3mW/°C above +70°C) .......1702mW

38-Pin TSSOP (derate 13.7mW/°C above +70°C) .....1096mW

Operating Temperature Range ...........................-40°C to +85°C

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

Junction Temperature......................................................+150°C

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

ELECTRICAL CHARACTERISTICS

(V+ = +2.7V to +3.6V, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C, unless otherwise noted.) (Notes 2, 3)

PARAMETER

CONDITIONS

UNITS

Rx INTERFACE

TA = +25°C59

On-Resistance R

ON

V

NO_

or V

NC_

= 1.5V

10

Ω

TA = +25°C 1.0

On-Resistance Match Between
Channels (Note 4)

∆R

ON

V

NO_

or V

NC_

= 1.5V

1.3

Ω

TA = +25°C 2.0 3.0

On-Resistance Flatness (Note 4)

)

V

NO_

or V

NC_

= 1.0V,

1.5V, 2.0V

3.4

Ω

)

NO_ or NC_ Off-Leakage
Current

)

V + = 3.6V ; V

C OM _

= 0.3V , 3.3V ;

V

N O_

or V

N C _

= 3.3V , 0.3V

-1 +1 µA

COM_ On-Leakage Current

)

V+ = 3.6V; V

COM_

= 0.3V, 3.3V;

V

NO_

or V

NC_

= 3.3V, 0.3V or floating

-1 +1 µA

Tx INTERFACE

TA = +25°C 0.7 0.9

On-Resistance (Note 5) R

ON

V

N O_

or V

N C _

= 1.5V

1.0

Ω

TA = +25°C

On-Resistance Match Between
Channels (Notes 3, 5)

∆R

ON

V

N O_

or V

N C _

= 1.5V

Ω

TA = +25°C 0.1

On-Resistance Flatness
(Notes 5, 6)

)

V+ = 3V;
I

COM_

= 100mA;

V

NO_

or V

NC_

= 1.0V,

1.5V, 2.0V

0.2

Ω

Note 1: Signals on NO_, NC_, COM_ exceeding V+ or GND are clamped by internal diodes. Limit forward-diode current to maximum

current rating.

SYM B O L

MIN TYP MAX

R

FLAT(ON

I

NO(OFF

I

NC (OFF

I

COM(ON

R

FLAT(ON

V+ = 3V, I

V+ = 3V, I

V+ = 3V; I

COM_

COM_

COM_

= 10mA,

= 10mA,

= 10mA;

V + = 3V , I

= 100m A,

C OM _

V + = 3V , I

= 100m A,

C OM _

TA = T

TA = T

TA = T

TA = T

TA = T

TA = T

to T

MIN

MAX

to T

MIN

MAX

to T

MIN

MAX

to T

MIN

MAX

0.03 0.150

to T

MIN

MAX

to T

MIN

MAX

0.175

0.18

MAX4670

Integrated T1/E1/J1 Short-Haul and

Long-Haul Protection Switch

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(V+ = +2.7V to +3.6V, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C, unless otherwise noted.) (Notes 2, 3)

PARAMETER

SYM B O L

CONDITIONS

MIN

TYP

MAX

UNITS

NO_ or NC_ Off-Leakage
Current

),

)

V + = 3.6V ; V

C OM _

= 0.3V , 3.3V ;

V

N O_

or V

N C _

= 0.3V , 3.3V

-1 +1 µA

COM_ On-Leakage Current

)

V+ = 3.6V; V

COM_

= 0.3V, 3.3V;

V

NO_

or V

NC_

= 0.3V, 3.3V or floating

-1 +1 µA

DYNAMIC CHARACTERISTICS

TA = +25°C

Turn-On Time t

ON

RL = 50Ω, C L = 35p F,
Fi g ur e 2

T

A

= T

MIN

to T

MAX

ns

TA = +25°C

Turn-Off Time t

OFF

RL = 50Ω,

TA = T

MIN

to T

MAX

ns

Break-Before-Make Delay t

D

RL = 50Ω, CL = 35pF, Figure 3 80 ns

Rx interface 8

Charge Injection Q

V

GE N

= 1.5V, R

GE N

=

Tx interface 20

pC

Rx interface

On-Channel
3dB Bandwidth

BW

Tx interface

MHz

V

ISO1

f < 3MHz

V

ISO2

Rx interface

R

L

= 50Ω, CL = 35pF,

3MHz < f < 30MHz

V

ISO1

f < 3MHz

Off-Isolation (Note 7)

V

ISO2

Tx interface

R

L

= 50Ω, CL = 35pF,

3MHz < f < 30MHz

dB

V

CT1

f < 3MHz

V

CT2

Rx interface,
Figure 5

3MHz < f < 30MHz

V

CT1

f < 3MHz

Crosstalk (Note 8)

V

CT2

Tx interface,
Figure 5

3MHz < f < 30MHz

dB

Rx interface f = 1MHz, Figure 6 12

NC_ or NO_ Off-Capacitance

Tx interface f = 1MHz, Figure 6 40

pF

Rx interface 24

COM_ On-Capacitance

f = 1MHz

Tx interface 60

pF

I

NO(OFF

I

NC(OFF

I

COM(ON

V

or V

N C _

= 1.5V ,

N O_

VNO or VNC = 1.5V,

CL = 35pF, Figure 2

0Ω, CL = 1nF, Fi gur e 4

300

RL = 50Ω, CL = 35pF,

RL = 50Ω, CL = 35pF,

RL = 50Ω, CL = 35pF,

RL = 50Ω, CL = 35pF,

300

-65

-58

-60

-40

-65

-50

C

OFFRX

C

OFFTX

C

C OM ( ON ) TX

C

C OM ( ON ) RX

RL = 50Ω, CL = 35pF,

RL = 50Ω, CL = 35pF,

-78

-30

400

750

200

750

MAX4670

Integrated T1/E1/J1 Short-Haul and
Long-Haul Protection Switch

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(V+ = +2.7V to +3.6V, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C, unless otherwise noted.) (Notes 2, 3)

PARAMETER

SYM B O L

CONDITIONS

MIN

TYP

MAX

UNITS

DIGITAL I/O (IN_, SWITCH )

Input-Low Voltage V

IL

V+ = 2.7V 0.5 V

Input-High Voltage V

IH

V+ = 3.6V 1.4 V

Input Leakage Current I

IL

V

IN_

= 0 or V+, V

S W I T C H

= 0 or V+ -1 +1 µA

SUPPLY

Operating Voltage Range V+ 2.7 3.6 V

Supply Current I+ V+ = 3.6V, V

IN_

= V

S W I T C H

= 0 or V+ 10 µA

Note 2: The algebraic convention is used in this data sheet. The most negative value is shown in the minimum column.
Note 3: Devices are 100% tested at hot and room and guaranteed by design at cold.
Note 4: ∆R

ON

= R

ON(MAX)

- R

ON(MIN)

.

Note 5: Guaranteed by design.
Note 6: Flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the

specified analog signal ranges.

Note 7: Off-isolation = 20log

10[VCOM_

/ (V

NO_

or V

NC_

)], V

COM_

= output, V

NO_

or V

NC_

= input to off switch.

Note 8: Crosstalk between any two switches.

Typical Operating Characteristics

(V+ = 3.0V, TA= +25°C, unless otherwise noted.)

ON-RESISTANCE

vs. COM_VOLTAGE (Tx INTERFACE)

MAX4670 toc01

V

COM_

(V)

ON-RESISTANCE (Ω)

3.01.2 1.8 2.40.6

0.6

0.7

0.8

0.9

0.5

03.6

V+ = 3V

V+ = 2.7V

V+ = 3.6V

ON-RESISTANCE vs. COM_ VOLTAGE

OVER TEMPERATURE (Tx INTERFACE)

MAX4670 toc02

V

COM_

(V)

ON-RESISTANCE (Ω)

2.72.42.11.81.51.20.90.60.3

0.2

0.4

0.6

0.8

1.0

1.2

0

0 3.0

TA = +85°C

TA = +25°C

TA = -40°C

ON-RESISTANCE

vs. COM_VOLTAGE (Rx INTERFACE)

MAX4670 toc03

V

COM_

(V)

ON-RESISTANCE (Ω)

3.01.2 1.8 2.40.6

4

5

6

7

8

9

10

3

0 3.6

V+ = 3.6V

V+ = 2.7V

V+ = 3V

MAX4670

Integrated T1/E1/J1 Short-Haul and

Long-Haul Protection Switch

_______________________________________________________________________________________ 5

ON-RESISTANCE vs. COM_ VOLTAGE

OVER TEMPERATURE (Rx INTERFACE)

MAX4670 toc04

V

COM_

(V)

ON-RESISTANCE (Ω)

2.72.42.11.81.51.20.90.60.3

2

4

6

8

10

12

0

0 3.0

TA = +85°C

TA = +25°C

TA = -40°C

10

0.01

-40 35 85

COM_ LEAKAGE CURRENT

vs. TEMPERATURE (Tx INTERFACE)

0.1

1

MAX4670toc05

TEMPERATURE (°C)

LEAKAGE CURRENT (nA)

-15 6010

10

0.01

-40 35 85

NC_/NO_ LEAKAGE CURRENT

vs. TEMPERATURE (Tx INTERFACE)

0.1

1

MAX4670toc06

TEMPERATURE (°C)

LEAKAGE CURRENT (nA)

-15 6010

NC_

NO_

COM_ LEAKAGE CURRENT

vs. TEMPERATURE (Rx INTERFACE)

MAX4670 toc07

TEMPERATURE (°C)

LEAKAGE CURRENT (nA)

603510-15

0.1

1

10

0.01

-40 85

NC_/NO_ LEAKAGE CURRENT

vs. TEMPERATURE (Rx INTERFACE)

MAX4670 toc08

TEMPERATURE (°C)

LEAKAGE CURRENT (nA)

603510-15

0.1

1

10

0.01

-40 85

NC_

NO_

TURN-ON TIME

vs. SUPPLY VOLTAGE (Tx INTERFACE)

MAX4670 toc09

SUPPLY VOLTAGE (V)

TURN-ON TIME (ns)

3.53.43.33.23.13.02.92.8

130

160

190

220

250

280

100

2.7 3.6

Typical Operating Characteristics (continued)

(V+ = 3.0V, TA= +25°C, unless otherwise noted.)

MAX4670

Integrated T1/E1/J1 Short-Haul and
Long-Haul Protection Switch

6 _______________________________________________________________________________________

TURN-ON/OFF TIMES

vs. TEMPERATURE (Rx INTERFACE)

MAX4670 toc14

TEMPERATURE (°C)

TURN-ON/OFF TIMES (ns)

603510-15

10

20

30

40

50

60

0

-40 85

t

ON

t

OFF

CHARGE INJECTION

vs. COM_ VOLTAGE (Tx INTERFACE)

MAX4670 toc15

V

COM

(V)

CHARGE INJECTION (pC)

2.52.01.51.00.5

30

60

90

120

150

0

0 3.0

CHARGE INJECTION

vs. COM_ VOLTAGE (Rx INTERFACE)

MAX4670 toc16

V

COM_

(V)

CHARGE INJECTION (pC)

2.52.01.51.00.5

2

4

6

8

10

12

0

0 3.0

FREQUENCY RESPONSE

(Tx INTERFACE)

FREQUENCY (MHz)

ON LOSS (dB)

MAX4670 toc17

-140

-120

-100

-80

-60

-40

-20

0

20

0.1 1 10 100 1000

ON LOSS

OFF-ISOLATIONOFF-ISOLATION

CROSSTALK

FREQUENCY RESPONSE

(Rx INTERFACE)

FREQUENCY (MHz)

ON LOSS (dB)

MAX4670 toc18

-140

-120

-100

-80

-60

-40

-20

0

20

0.1 1 10 100 1000

ON LOSS

OFF-ISOLATIONOFF-ISOLATION

CROSSTALK

Typical Operating Characteristics (continued)

(V+ = 3.0V, TA= +25°C, unless otherwise noted.)

TURN-OFF TIME

vs. SUPPLY VOLTAGE (Tx INTERFACE)

MAX4670 toc10

SUPPLY VOLTAGE (V)

TURN-OFF TIME (ns)

3.53.43.33.23.13.02.92.8

10

20

30

40

50

60

0

2.7 3.6

TURN-ON TIME

vs. TEMPERATURE (Tx INTERFACE)

MAX4670 toc12

TEMPERATURE (°C)

TURN-ON TIME (ns)

603510-15

150

175

200

250

300

350

225

275

325

375

125

400

100

-40 85

V+ = 3V

TURN-ON/OFF TIMES

vs. SUPPLY VOLTAGE (Rx INTERFACE)

MAX4670 toc11

SUPPLY VOLTAGE (V)

TURN-ON/OFF TIMES (ns)

3.43.33.23.13.02.92.8

65

70

75

80

85

90

95

60

2.7 3.5

3.6

t

ON

t

OFF

TURN-OFF TIME

vs. TEMPERATURE (Tx INTERFACE)

MAX4670 toc13

TEMPERATURE (°C)

TURN-OFF TIME (ns)

603510-15

22

24

28

32

36

26

30

34

38

40

20

-40 85

V+ = 3V