DG221B
Vishay Siliconix
Quad SPST CMOS Analog Switch with Latches
DESCRIPTION
The DG221B is a monolithic quad single-po...
DG221B
Vishay Siliconix
Quad SPST CMOS Analog Switch with Latches
DESCRIPTION
The DG221B 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 DG221B can be memory mapped, and addressed as a single data byte for simultaneous switching.
The DG221B combines low power and low on-resistance (60 typical) while handling continuous currents up to 20 mA. An epitaxial layer prevents latchup.
The device features true bidirectional performance in the on condition.
FEATURES Accepts 150 ns write pulse width 5 V on-chip
regulator Latches are transparent with WR low Low on-resistance: 60 W
Pb-free Available
RoHS*
COMPLIANT
BENEFITS Compatible with most µP buses Allows wide power supply tolerance without affecting TTL
compatibility Reduced power consumption Allows flexibility of design
APPLICATIONS µP based systems Automatic test equipment Communication systems Data acquisition systems Medical instrumentation Factory automation
FUNCTIONAL BLOCK DIAGRAM AND PIN CONFIGURATION
Dual-In-Line and SOIC
IN1 D1 S1 VGND S4 D4 IN4
1 2 3 4 5 6 7 8
Input Latch
16 IN2 15 D2 14 S2 13 V+ 12 WR 11 S3 10 D3 9 IN3
Four latchable SPST switches per package
TRUTH TABLE
INX WR 00 10
X
X
Logic "0" ≤ 0.8 V Logic "1" ≥ 2.4 V
1
Switch
ON OFF Control data latched-in, switches on or off as selected ...