
DG421/DG423/DG425
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.
WR
D1
DG421
VL
V+
IN2
S2
D2
RS
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
max) between switches and on-resistance
flatness over the signal range (4
max). These low on-
resistance switches (20
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 (Ps). 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
(175ns for tON and 145ns for tOFF) and low power
consumption (35W max) make these parts ideal for
battery-powered applications requiring P-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
o Improved r(DS)ON Match Between Channels (3
max)
o Guaranteed rFLAT(ON) Over Signal Range (4
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
o Low rDS(ON) (35
max)
o Single-Supply Operation +10V to +30V
Bipolar-Supply Operation ±4.5V to ±20V
o Low Power Consumption (35W 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