DG221
Quad SPST CMOS Analog Switch with Latches
Features
Benefits
Applications
D
D
D
D
D
D Compatible with Most mP Buses
D Allows Wide Power Supply Tolerance
Without Affecting TTL Compatibility
D Reduced Power Consumption
D Allows Flexibility of Design
D
D
D
D
D
D
Accepts 150-ns Write Pulse Width
5-V On-Chip Regulator
Built on PLUS-40 Process
Latches Are Transparent with WR Low
Low On-Resistance: 60 W
mP Based Systems
Automatic Test Equipment
Communication Systems
Data Acquisition Systems
Medical Instrumentation
Factory Automation
Description
The DG221 is a monolithic quad single-pole, single-throw
analog switch designed for precision switching applications
in communication, instrumentation and process control
systems. Featuring independent onboard latches and a
common WR pin, each DG221 can be memory mapped,
and addressed as a single data byte for simultaneous
switching.
Designed on the Siliconix PLUS-40 CMOS process, the
DG221 combines low power and low on-resistance (60 W
typical) while handling continuous currents up to 20 mA.
An epitaxial layer prevents latchup.
The device features true bidirectional performance in the
on condition. These switches guarantee a rail-to-rail
blocking capability (44 V max), in the off condition.
Functional Block Diagram and Pin Configuration
Four Latchable SPST Switches per Package
Dual-In-Line and SOIC
Truth Table
INX
WR
Switch
0
0
ON
1
0
OFF
1
16
IN2
D1
2
15
D2
S1
3
14
S2
V–
4
13
V+
X
GND
5
12
WR
X
S4
6
11
S3
D4
7
10
D3
IN4
8
9
IN3
Input Latch
IN1
Control data latched-in,
switches on or off as selected
by last INX
1
Maintains previous state
Logic “0” v 0.8 V
Logic “1” w 2.4 V
Ordering Information
Temp Range
Package
0_C to 70_C
16-Pin Plastic DIP
DG221CJ
–40_C to 85_C
16-Pin Narrow SOIC
DG221DY
–55_C to 125_C
Top View
16-Pin CerDIP
Part Number
DG221AK/883
Updates to this data sheet may be obtained via facsimile by calling Siliconix FaxBack, 1-408-970-5600. Please request FaxBack document #70041.
Siliconix
S-52881—Rev. C, 28-Apr-97
1
