VS3244 / VS32244
High Speed CMOS VSwitch
Dual 4-Bit Bus Switches
Applications
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5V to 3.3V translation in mixed-supply environment
Hot-swap interface
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Logic replacement
Bus isolation
General Description
The VS3244 and VS32244 are high-speed TTL–compatible dual 4-bit bus switches. The VS3244 contains
two banks of 4-bit switches, with one common active low enable (/G) per bank. The low ON resistance of the
VS3244 allows inputs to be connected to outputs, without adding propagation delay and without generating
additional signal noise. The VS32244 has 25Ω resistors in series with the switches to reduce ground-bounce
noise and signal reflection.
The VS3244 and VS32244 bus switches are function and pinout compatible with QS3244 and CBT3244
switches. They enable 5V to 3.3V translation when used with a diode in the power supply line. In addition,
the high off-isolation in the ‘disable’ mode makes VS3244 and VS32244 ideal interface elements for hot-swap
applications.
Features
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Enhanced N-FET with no DC path to V
CC
or GND in normal operating signal voltage
range.
Low impedance bidirectional data flow:
5Ω (VS3244) and 25Ω (VS32244)
Pin-compatible with QS3244 and CBT3244
switches.
Near-zero propagation delay
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Zero added ground bounce or signal noise
TTL-compatible control signals
Undershoot clamp diodes on all switch and
control pins
ESD rating >2000V (Human Body Model)
or >200V (Machine Model)
Latch-up current >100mA
Available- Available in 150-mil wide QSOP
package
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Figure 1. Functional Block Diagram
Figure 2. Pin Configuration
(All Pins Top View)
QSOP
/1G
1A1
1A2
1A3
1A4
1B1
1B2
1B3
1B4
/2G
2A1
2A2
2A3
2A4
2B1
2B2
2B3
2B4
/1G
1A1
2B4
1A2
2B3
1A3
2B2
1A4
2B1
GND
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
V
CC
/2G
1B1
2A4
1B2
2A3
1B3
2A2
1B4
2A1
A0
2001-04-12
Vaishali Semiconductor
Page 1
www.vishali.com
747 Camden Avenue, Suite C Campbell CA 95008
MDSS-0008-02
Ph. 408.377.6060
Fax 408.377.6063
VAISH [ VAISHALI SEMICONDUCTOR ]
