DG485
Vishay Siliconix
Document Number: 70065
S-52433—Rev. E, 06-Sep-99 www .vishay.com FaxBack 408-970-5600
5-1
Octal Analog Switch Array
Low On-Resistance: 55
Rail-to-Rail Analog Input Range
Serial Interface
Low-Power—PD: 35 nW
TTL and CMOS Compatible
Any Combination of 8 SPST to the
Output
High Speed—tON: 170 ns
Low Signal Distortion
Devices Can Be Chained for System
Expansion
Reduced Board Space
Reduced Switch Errors
Reduced Power Supply
Requirements
Simple Interfacing
Audio Switching and Routing
Audio Teleconferencing
Data Acquisition and Industrial
Process Control
Battery Powered Remote Systems
Automotive, Avionics and ATE
Systems
Summing Amplifiers
The DG485 is an analog switch array consisting of eight SPST
switches connected to a common output. This device may be
used as an 8-channel multiplexer in serial control applications.
Any, all or none of the eight switches may be closed at any
given time. Combining low on-resistance (rDS(on) 55 , typ.)
and fast switching (tON: 170 ns, typ.), the DG485 is ideally
suited for data acquisition, process control, communication,
and avionic applications.
Control data is input serially into the shift register with each
clock pulse. The shift register contents can be latched-in (via
LD) at any point into an octal latch which in turn controls all
switches. RS resets the shift register, forcing all latch inputs to
a low condition (all switches off). The serial input (DIN) and
serial output (DOUT) allow daisy chaining of multiple arrays for
large systems.
Built on the V ishay Siliconix high voltage silicon gate process
the DG485 has a wide 44-V power supply voltage rating. An
epitaxial layer prevents latchup.
Each channel conducts equally well in either direction when on
and blocks up to rail-to-rail voltages when off.
For additional information please refer to application note
AN204.
1
2
3
4
5
6
7
8
18
17
16
15
14
13
12
11
LD RS
VLGND
S4D
S3S5
S2S6
S1S7
V+ S8
DIN V–
Dual-In-Line
Top View
910
CLK DOUT
Shift Register
Latches
PLCC and LCC
14
15
16
17
18
8
7
6
5
4
1231920
111091312
Top View
S4D
S3S5
S2S6
S1S7
V+ S8
IN
CLK
NC
OUT
V
LD
NC
RS
GND
Shift Register/Latches
L
D
D
V–