Improved Low-Power,

CMOS Analog Switches with Latches

________________________________________________________________

Maxim Integrated Products

1

TOP VIEW

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

S1

IN1

V-

GND

N.C.

N.C.

WR

D1

DG421

V+

IN2

S2

D2

RS

N.C.

N.C.

DIP

_________________Pin Configurations

SWITCHES SHOWN FOR

LOGIC "1" INPUT

D2

D1

CK

R

DQ

CK

R

DQ

TWO SPST SWITCHES

PER PACKAGE

WR RS IN

SWITCH

01

0

1

Off

On

LOGIC "O"

≤ 0.8V

LOGIC "1"

≥ 2.4V

DG421 TRUTH TABLE

S1

WR

IN1

IN2

RS

S2

DG421

__Functional Diagrams/Truth Tables

Call toll free 1-800-998-8800 for free samples or literature.

19-0137; Rev 1; 3/94

_______________General Description

Maxim’s redesigned DG421/DG423/DG425 monolithic

analog switches now feature guaranteed on-resistance

matching (3

Ω max) between switches and on-resistance

flatness over the signal range (4

Ω max). These low on-

resistance switches (20

Ω typ) conduct equally well in both

directions. They guarantee a low charge injection of 15pC

maximum and an ESD tolerance of 2000V minimum per

Method 3015.7. Off leakage current over temperature has

also been reduced (less than 5nA at +85°C).

The DG421/DG423/DG425 are precision, dual CMOS

switches with latchable logic inputs that simplify inter-

facing with microprocessors (µPs). The single-pole/single-

throw DG421 and double-pole/single-throw DG425 are

normally open dual switches. The dual, single-

pole/double-throw DG423 has two normally open and

two normally closed switches. Fast switching times

consumption (35µW max) make these parts ideal for

battery-powered applications requiring µP-compatible

switches. Operation is from a single +10V to +30V supply,

or bipolar ±4.5V to ±20V supplies. Fabricated with the

same 44V silicon-gate process, these switches have

rail-to-rail signal handling capabilities.

_______________________Applications

Sample-and-Hold Circuits

Modems

Fax Machines

Test Equipment

Battery-Operated Systems

PBX, PABX

Guidance and Control Systems

Military Radios

Audio Signal Routing

Communication Systems

______________________New Features

o Plug-In Upgrades for Industry-Standard

DG421/DG423/DG425

Ω max)

Ω max)

o Improved Charge Injection (15pC max)

o Improved Off Leakage Current Over Temperature

(<5nA at +85°C)

o Withstands Electrostatic Discharge (2000V min)

per Method 3015.7

__________________Existing Features

Ω max)

o Single-Supply Operation +10V to +30V

Bipolar-Supply Operation ±4.5V to ±20V

o Low Power Consumption (35µW max)

o Rail-to-Rail Signal Handling Capability

o TTL/CMOS-Logic Compatible

______________Ordering Information

Ordering Information continued at end of data sheet.

* Contact factory for dice specifications.

**Contact factory for availability and processing to MIL-STD-883B.

Functional Diagrams/Truth Tables continued at end of data sheet.

N.C. = No Internal Connection

Pin Configurations continued at end of data sheet.

16 CERDIP**

-55°C to +125°C

DG421AK

16 SO

-40°C to +85°C

DG421DY

Dice*

0°C to +70°C

DG421C/D

0°C to +70°C

16 CERDIP

-40°C to +85°C

DG421DK

16 Plastic DIP

-40°C to +85°C

DG421DJ

16 SO

0°C to +70°C

DG421CY

16 Plastic DIP

DG421CJ

PIN-PACKAGE

TEMP. RANGE

PART