DG485 Datasheet, PDF (1/11 Pages) Vishay Siliconix – Octal Analog Switch Array

Octal Analog Switch Array
DG485
Vishay Siliconix
FEATURES
D Low On-Resistance: 55 W
D Rail-to-Rail Analog Input Range
D Serial Interface
D Low-Power—P_D: 35 nW
D TTL and CMOS Compatible
D Any Combination of 8 SPST to the
Output
D High Speed—t_ON: 170 ns
BENEFITS
APPLICATIONS
D Low Signal Distortion
D Devices Can Be Chained for System
Expansion
D Reduced Board Space
D Reduced Switch Errors
D Reduced Power Supply
Requirements
D Simple Interfacing
D Audio Switching and Routing
D Audio Teleconferencing
D Data Acquisition and Industrial
Process Control
D Battery Powered Remote Systems
D Automotive, Avionics and ATE
Systems
D Summing Amplifiers
DESCRIPTION
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 (r_DS(on) 55 W, typ.)
and fast switching (t_ON: 170 ns, typ.), the DG485 is ideally
suited for data acquisition, process control, communication,
and avionic applications.
serial output (D_OUT) allow daisy chaining of multiple arrays for
large systems.
Built on the Vishay Siliconix high voltage silicon gate process
the DG485 has a wide 44-V power supply voltage rating. An
epitaxial layer prevents latchup.
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 (D_IN) and
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.
FUNCTIONAL BLOCK DIAGRAM AND PIN CONFIGURATION
Dual-In-Line
PLCC and LCC
LD ₁
V_{L 2}
S_{4 3}
S_{3 4}
S_{2 5}
S_{1 6}
V+ ₇
D_{IN 8}
CLK ₉
Shift Register
Latches
18 ^RS
17 ^GND
16 ^D
15 ^S5
14 ^S6
13 ^S7
12 ^S8
11 ^V–
10 ^DOUT
Document Number: 70065
S-52433—Rev. E, 06-Sep-99
Top View
3 2 1 20 19
S₄ 4
S₃ 5
S₂ 6
S₁ 7
V+ 8
Shift Register/Latches
9 10 11 12 13
18 D
17 S₅
16 ^S6
15 S₇
14 S₈
Top View
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