VS3245 / VS32245
High Speed CMOS VSwitch
8-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 VS3245 and VS32245 are high-speed TTL–compatible 8-bit bus switches. The VS3245 contains eight
high-speed bus switches, with a common active low enable (/OE). The low ON resistance of the VS3245
allows inputs to be connected to outputs, without adding propagation delay and without generating additional
signal noise. The VS32245 has 25Ω resistors in series with the switches to reduce ground-bounce noise and
signal reflection.
The VS3245 and VS32245 bus switches are function and pinout compatible with QS3245 and CBT3245
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 VS3245 and VS32245 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 (VS3245) and 25Ω (VS32245)
Pin-compatible with QS3245 and CBT3245
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 in 150-mil wide QSOP package
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Figure 1. Functional Block Diagram
Figure 2. Pin Configuration
(All Pins Top View)
A0
A1
A2
A3
A4
A5
A6
A7
NC
A0
A1
A2
1
2
3
4
5
6
7
8
9
QSOP
20
19
18
17
16
15
14
13
12
11
V
CC
/OE
B0
B1
B2
B3
B4
B5
B6
B7
/OE
A3
A4
A5
A6
A7
GND
10
B0
B1
B2
B3
B4
B5
B6
B7
2001-04-12
Vaishali Semiconductor
Page 1
www.vaishali.com
747 Camden Avenue, Suite C Campbell CA 95008
MDSS-0007-02
Ph. 408.377.6060
Fax 408.377.6063
VAISH [ VAISHALI SEMICONDUCTOR ]
