2001-04-12

Page 1

MDSS-0007-02

www.vaishali.com

Vaishali Semiconductor

747 Camden Avenue, Suite C

Campbell

CA 95008

Ph. 408.377.6060

Fax 408.377.6063

Applications

•= 5V to 3.3V translation in mixed-supply environment

•= Hot-swap interface

•= 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 25

Ω 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.

Figure 1. Functional Block Diagram

Figure 2. Pin Configuration

VS3245 / VS32245

High Speed CMOS VSwitch

8-Bit Bus Switches

Features

or GND in normal operating signal voltage

range.

•= Low impedance bidirectional data flow:

5

Ω (VS3245) and 25Ω (VS32245)

•= Pin-compatible with QS3245 and CBT3245

switches.

•= Near-zero propagation delay

•= 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

(All Pins Top View)

QSOP

/OE

B7

B0

B1

B2

A0

B3

B4

B5

B6

A1

A2

A3

A4

A5

A6

A7

GND

1

2

3

4

8

5

6

7

9

10

20

19

18

17

16

15

14

13

12

11

NC

A0

A1

A2

A3

A4

A5

A6

A7

/OE

B0

B2

B3

B4

B5

B1

B6

B7