DG221B Datasheet, PDF (6/6 Pages) Vishay Siliconix – Quad SPST CMOS Analog Switch with Latches

DG221B
Vishay Siliconix
APPLICATIONS
New Product
Data Bus
WR
Address Bus
+15 V
V+
DG221B
S₁
IN₁
D
Q
C
D₁
S₂
IN₂
D
Q
C
D₂
S₃
IN₃
D
Q
C
D₃
S₄
IN₄
D
Q
C
WR
D₄
CS
Address
Decoder
GND
V–
–15 V
The TL081 is used as an output buffer while
the voltage divider provides attenuation.
FIGURE 8. mP-Controlled Analog Signal Attenuator
V_IN
9 MW
900 kW
90 kW
9 kW
1 kW
+
TL081
V_O
–
TRUTH TABLE
IN₁
IN₂
IN₃
IN₄ WR^A ON SWITCH
0
0
0
0
0
All
1
1
1
1
0
None
0
1
1
1
0
1
1
0
1
1
0
2
1
1
0
1
0
3
1
1
1
0
0
4
OUTPUT ATTENUATION FOR FIGURE 8
WR IN₁
IN₂
IN₃
IN₄
0
0
1
1
1
0
1
0
1
1
Gain
0.1
0.01
0
1
1
0
1
0.001
0
1
1
1
0
0.0001
Notes:
a. WR may be held at “0” for temporary operation similar to DG201A/DG201B. With WR at “0” SW₁ will remain on as long as IN₁ is held at “0”.
www.vishay.com
6
Document Number: 71616
S-03627—Rev. A, 23-Apr-01