LINEAR TECHNOLOGY LTC1391 Technical data

FEATURES

■

Low RON: 45Ω

■

Single 2.7V to ±5V Supply Operation

■

Low Charge Injection

■

Serial Digital Interface

■

Analog Inputs May Extend to Supply Rails

■

Low Leakage: ±5nA Max

■

Guaranteed Break-Before-Make

■

TTL/CMOS Compatible for All Digital Inputs

■

Cascadable to Allow Additional Channels

■

Can Be Used as a Demultiplexer

U

APPLICATIO S

■

Data Acquisition Systems

■

Communication Systems

■

Signal Multiplexing/Demultiplexing

LTC1391

8-Channel

Analog Multiplexer with

Cascadable Serial Interface

U

DESCRIPTIO

The LTC®1391 is a high performance CMOS 8-to-1 analog
multiplexer. It features a serial digital interface that allows
several LTC1391s to be daisy-chained together, increas­ing the number of MUX channels available using a single
digital port.

The LTC1391 features a typical RON of 45Ω, a typical
switch leakage of 50pA and guaranteed break-before­make operation. Charge injection is ±10pC maximum. All
digital inputs are TTL and CMOS compatible when oper­ated from single or dual supplies. The inputs can with­stand 100mA fault current.

The LTC1391 is available in 16-pin PDIP, SSOP and
narrow SO packages. For applications requiring 2-way
serial data transmission, see the LTC1390 data sheet.

, LTC and LT are registered trademarks of Linear Technology Corporation.

TYPICAL APPLICATIO

3V, 8-Channel 12-Bit ADC

ANALOG

INPUTS

SERIAL INTERFACE

TO MUX AND ADC

1

S0

2

S1

3

S2

4

S3

LTC1391

5

S4

6

S5

7

S6

8

S7

DATA IN

DATA OUT

D

GND

CLK

OUT

D

CLK

CS

16

+

V

15

D

14

–

V

13
12

IN

11

CS

10

9

U

0.1µF

OPTIONAL A/D

INPUT FILTER

On-Resistance vs

3V

300

1391 TA01

1µF

250

200

150

100

ON-RESISTANCE (Ω)

50

0

–5 –4 –2 0 2 4

1

V

REF

2

+IN

LTC1285

3

–IN

4

GND

CS/SHDN

8

V

CC

7

CLK

6

D

OUT

5

Analog Input Voltage

TA = 25°C

V+ = 5V

–

= –5V

V

–3 –1 1 3

ANALOG INPUT VOLTAGE (V)

V+ = 2.7V

–

= 0V

V

5

1391 TA02

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1

LTC1391

WWWU

ABSOLUTE AXI U RATI GS

PACKAGE/ORDER I FOR ATIO

UU

W

(Note 1)

Total Supply Voltage (V+ to V–) .............................. 15V

Input Voltage

Analog Inputs/Outputs ..... (V– – 0.3V) to (V+ + 0.3V)

Digital Inputs .........................................– 0.3V to 15V

Digital Outputs ..........................–0.3V to (V+ + 0.3V)

Power Dissipation.............................................. 500mW

Operating Temperature Range

LTC1391C ............................................... 0°C to 70°C

LTC1391I........................................... –40°C to 85°C

Storage Temperature Range ................. –65°C to 150°C

Lead Temperature (Soldering, 10 sec).................. 300°C

ELECTRICAL CHARACTERISTICS

The ● denotes the specifications which apply over the full operating

S0
S1
S2
S3
S4
S5
S6
S7

GN PACKAGE

16-LEAD PLASTIC SSOP

T

JMAX

T

JMAX

T

JMAX

Consult LTC Marketing for parts specified with wider operating temperature ranges.

TOP VIEW

1
2
3
4
5
6
7
8

S PACKAGE

16-LEAD PLASTIC SO

= 125°C, θJA = 110°C/ W (GN)
= 125°C, θJA = 70°C/W (N)
= 125°C, θJA = 100°C/ W (S)

16
15
14
13
12
11
10

9

N PACKAGE

16-LEAD PDIP

+

V
D

–

V
D

OUT

DIN
CS
CLK
GND

ORDER PART

NUMBER

LTC1391CGN
LTC1391CN
LTC1391CS
LTC1391IGN
LTC1391IN
LTC1391IS

GN PART MARKING

1391
1391I

temperature range, otherwise specifications are at TA = 25°C. V+ = 5V, V– = –5V, GND = 0V, unless otherwise specified.

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Switch

V

ANALOG

R

ON

I

S(OFF)

I

D(OFF)

I

D(ON)

Digital

V

INH

V

INL

I

INL

V

OH

V

OL

Analog Signal Range (Note 2) ● –5 5 V
On-Resistance VS = ±3.5V, ID = 1mA T

∆RON vs V
∆RON vs Temperature 0.5 %/°C

Off Input Leakage VS = 4V, VD = –4V, VS = –4V, VD = 4V ±0.05 ±5nA

Off Output Leakage VS = 4V, VD = –4V, VS = –4V, VD = 4V ±0.05 ±5nA

On Channel Leakage VS = VD = ±4V ±0.05 ±5nA

High Level Input Voltage V+ = 5.25V ● 2.4 V
Low Level Input Voltage V+ = 4.75V ● 0.8 V

, I

Input Current VIN = 5V, 0V ● ±5 µA

INH

High Level Output Voltage V+ = 4.75V, IO = –10µA 4.74 V

Low Level Output Voltage V+ = 4.75V, IO = 1.6mA ● 0.5 0.8 V

S

Channel Off

Channel Off

Channel On

+

= 4.75V, IO = –360µA ● 2.4 4.50 V

V

= 0°C (LTC1391C) 75 Ω

MIN

T

= –40°C (LTC1391I)

MIN

25°C4575Ω
T

= 70°C (LTC1391C) 120 Ω

MAX

= 85°C (LTC1391I)

T

MAX

20 %

● ±20 nA

● ±20 nA

● ±20 nA

2

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LTC1391

ELECTRICAL CHARACTERISTICS

The ● denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. V+ = 5V, V– = –5V, GND = 0V, unless otherwise specified.

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Dynamic

f

CLK

t

ON

t

OFF

t

OPEN

OIRR Off Isolation VS = 2V
Q

INJ

C

S(OFF)

C

D(0FF)

Clock Frequency (Note 2) 5 MHz
Enable Turn-On Time VS = 2.5V, RL = 1k, CL = 35pF 260 400 ns
Enable Turn-Off Time VS = 2.5V, RL = 1k, CL = 35pF 100 200 ns
Break-Before-Make Interval 35 155 ns

, RL = 1k, f = 100kHz 70 dB

P–P

Charge Injection RS = 0, CL = 1000pF, VS = 1V (Note 2) ±2 ±10 pC
Input Off Capacitance 5pF
Output Off Capacitance 10 pF

Supply

+

I

–

I

Positive Supply Current All Logic Inputs Tied Together, VIN = 0V or 5V ● 15 40 µA
Negative Supply Current All Logic Inputs Tied Together, VIN = 0V or 5V ● –15 –40 µA

The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
V+ = 2.7V, V– = GND = 0V, unless otherwise specified.

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Switch

V

ANALOG

R

ON

I

S(OFF)

I

D(OFF)

I

D(ON)

Digital

V

INH

V

INL

I

INL

V

OH

V

OL

Analog Signal Range (Note 2) ● 0 2.7 V
On-Resistance VS = 1.2V, IO = 1mA T

= 0°C (LTC1391C) 300 Ω

MIN

T

= –40°C (LTC1391I)

MIN

25°C 250 300 Ω
T

= 70°C (LTC1391C) 350 Ω

MAX

= 85°C (LTC1391I)

T

MAX

∆RON vs V

S

20 %

∆RON vs Temperature 0.5 %/°C
Off Input Leakage VS = 2.5V, VD = 0.5V; VS = 0.5V, VD = 2.5V (Note 3) ±0.05 ±5nA

Channel Off

● ±20 nA

Off Output Leakage VS = 2.5V, VD = 0.5V; VS = 0.5V, VD = 2.5V (Note 3) ±0.05 ±5nA

Channel Off

● ±20 nA

On Channel Leakage VS = VD = 0.5V, 2.5V (Note 3) ±0.05 ±5nA

Channel On

● ±20 nA

High Level Input Voltage V+ = 3.0V ● 2.0 V
Low Level Input Voltage V+ = 2.4V ● 0.8 V

, I

Input Current VIN = 2.7V, 0V ● ±5 µA

INH

High Level Output Voltage V+ = 2.7V, IO = –20µA 2.68 V

Low Level Output Voltage V+ = 2.7V, IO = 20µA 0.01 V

+

= 2.7V, IO = –400µA ● 2.0 2.30 V

V

+

V

= 2.7V, IO = 400µA ● 0.20 0.8 V

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3

LTC1391

TEMPERATURE (°C)

–40

OUTPUT VOLTAGE (V)

0.65

0.60

0.55

0.50

0.45

0.40

0.35

0.30

0.25

0.20

0.15

0.10
60

1391 G03

–20

020

40

80

V+ = 5V

V

–

= –5V

I

O

= 1.8mA

V+ = 2.7V

V

–

= 0V

I

O

= 400µA

ELECTRICAL CHARACTERISTICS

The ● denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. V+ = 2.7V, V– = GND = 0V, unless otherwise specified.

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Dynamic

f

CLK

t

ON

t

OFF

t

OPEN

QIRR Off Isolation VS = 2V
Q

INJ

C

S(OFF)

C

D(OFF)

Clock Frequency (Note 2) 5 MHz
Enable Turn-On Time VS = 1.5V, RL = 1k, CL = 35pF (Note 4) 490 800 ns
Enable Turn-Off Time VS = 1.5V, RL = 1k, CL = 35pF (Note 4) 190 400 ns
Break-Before-Make Interval (Note 4) 125 290 ns

, RL = 1k, f = 100kHz 70 dB

P–P

Charge Injection RS = 0, CL = 1000pF, VS = 1V (Note 2) ±1 ±5pC
Input Off Capacitance 5pF
Output Off Capacitance 10 pF

Supply

+

I

Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.

Note 2: Guaranteed by Design.

Positive Supply Current All Logic Inputs Tied Together, VIN = 0V or 2.7V ● 0.2 2 µA

Note 3: Leakage current with a single 2.7V supply is guaranteed by
correlation with the ±5V leakage current specifications.

Note 4: Timing specifications with a single 2.7V supply are guaranteed by
correlation with the ±5V timing specifications.

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TYPICAL PERFOR A CE CHARACTERISTICS

300

250

200

150

100

ON-RESISTANCE (Ω)

50

0

4

On-Resistance vs Temperature

V+ = 2.7V

–

= 0V

V

= 1.2V

V

S

V+ = 5V

–

= –5V

V

= 0V

V

S

–40 –20

20 40 60

0

TEMPERATURE (°C)

80

1391 G01

Driver Output Low Voltage
vs Output Current

1.2
TA = 25°C

1.1

1.0

0.9

0.8

0.7

0.6

0.5

0.4

OUTPUT VOLTAGE (V)

0.3

0.2

0.1

0

0.2 0.6

0.4

0

OUTPUT CURRENT (mA)

1.0 2.01.8

0.8

V+ = 2.7V

–

= 0V

V

V+ = 5V

–

= –5V

V

1.4

1.2

Driver Output Low Voltage
vs Temperature

1.6

1391 G02

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