Vishay Siliconix
DG308B, DG309B
Document Number: 70047
S11-0303-Rev. G, 28-Feb-11
www.vishay.com
1
Improved Quad CMOS Analog Switches
FEATURES
• ± 22 V supply voltage rating
• CMOS compatible logic
• Low on-resistance - R
DS(on)
: 45
• Low leakage - I
D(on)
: 20 pA
• Single supply operation possible
• Extended temperature range
• Fast switching - t
ON
: < 200 ns
• Low glitching - Q: 1 pC
BENEFITS
• Wide analog signal range
• Simple logic interface
• Higher accuracy
• Minimum transients
• Reduced power consumption
• Superior to DG308A, DG309
• Space savings (TSSOP)
APPLICATIONS
• Industrial instrumentation
• Test equipment
• Communications systems
• Disk drives
• Computer peripherals
• Portable instruments
• Sample-and-hold circuits
DESCRIPTION
The DG308B, DG309B analog switches are highly improved
versions of the industry-standard DG308A, DG309. These
devices are fabricated in Vishay Siliconix’ proprietary silicon
gate CMOS process, resulting in lower on-resistance, lower
leakage, higher speed, and lower power consumption.
These quad single-pole single-throw switches are designed
for a wide variety of applications in telecommunications,
instrumentation, process control, computer peripherals, etc.
An improved charge injection compensation design
minimizes switching transients. The DG308B and DG309B
can handle up to ± 22 V input signals. An epitaxial layer
prevents latchup.
All devices feature true bi-directional performance in the on
condition, and will block signals to the supply levels in the off
condition.
The DG308B is a normally open switch and the DG309B is
a normally closed switch. (see Truth Table.)
FUNCTIONAL BLOCK DIAGRAM AND PIN CONFIGURATION
Logic “0” 3.5 V
Logic “1” 11 V
* Pb containing terminations are not RoHS compliant, exemptions may apply
DG308B
IN
1
IN
2
D
1
D
2
S
1
S
2
V- V+
GND NC
S
4
S
3
D
4
D
3
IN
4
IN
3
Dual-In-Line, SOIC and TSSOP
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
Top View
TRUTH TABLE
Logic DG308B DG309B
0 OFF ON
1ONOFF
