Vaishali Semiconductor VS3345Q, VS32345Q Datasheet

VS3345 / VS32345

CC

3

8

5 6

9

A0A1A

A3A

A

A

A7/

High Speed CMOS VSwitch

8-Bit Bus Switches with

Active High & Low Enables

Applications

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

•= Hot-swap interface

General Description

The VS3345 and VS32345 are high-speed TTL–compatible 8-bit bus switches. The VS3345 contains eight high-speed
bus switches, with common active low (/OE) and active high (OE) enables. The low ON resistance of the VS3345
allows inputs to be connected to outputs, without adding propagation delay and without generating additional signal
noise. The VS32345 has 25Ω resistors in series with the switches to reduce ground-bounce noise and signal reflection.

The VS3345 and VS32345 bus switches switches 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 VS3345 and VS32345 ideal interface
elements for hot-swap applications.

•= Logic replacement

•= Bus isolation

Features

•= Enhanced N-FET with no DC path to VCC
or GND in normal operating signal voltage
range.

•= Low impedance bidirectional data flow:
5Ω (VS3345) and 25Ω (VS32345)

•= 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

Figure 1. Functional Block Diagram Figure 2. Pin Configuration

(All Pins Top View)

A0

A1 A2 A3 A4 A5 A6 A7

QSOP

OE

/OE

B2

B3 B4 B5 B6

OE

1
2

4

2

4
5

7

6

B7B0 B1

GND

10

20
19
18

17
16

15

14
13

12
11

V

OE

B0
B1
B2

B3
B4

B5
B6

B7

2001-04-12 Page 1 MDSS-0010-01

Vaishali Semic onductor  747 Camden Avenue, Suite C  Cam pbel l  CA 95008  P h. 408.377.6060  Fax [phone]

www.vaishali.com

VS3345/VS32345
Table 1. Pin Description

Name I/O Description

A0 - A7 I/O Data Input or Output
/OE I Active Low Enable Input
OE I Active High Enable Input
B0 – B7 I/O Data Output or Input

Table 2. Function Table

Input Path Function

/OE OE
H X Hi Impedance Disable all switches
X L Hi Impedance Disable all switches
L H An <-> Bn A

Note: X = Don’t care

= Bn

n

Table 3. Absolute Maximum Ratings

Supply Voltage to Ground………………………….…..-0.5V to +7.0V
DC Switch Voltage VS……………………….………….-0.5V to +7.0V
DC Input Voltage VIN………………………………… ...-0.5V to +7.0V
AC Input Voltage (Pulse Width < 20ns)……………….…………-3.0V
DC Output Sink Current per Switch Pin…………………...…..120 mA
Maximum Power Dissipation…………………………….…..0.5 Watts
Storage Temperature………………………………...-65oC to +150oC

Note: ABSOLUTE MAXIMUM CONTINUOUS RATINGS are those values beyond which damage to the device

may occur. Exposure to these conditions or conditions beyond those indicated may adversely affect
device reliability. Correct functional operation whiled operating in the absolute maximum rated conditions
is not implied.

Table 4. Capacitance

TA = 25oC, f = 1 MHz, VIN = 0V, V

OUT

= 0V

QSOP

Pins Typ Max Unit

Control Inputs 4 5 pF
VSwitch Channels

(Switch OFF)

Note: Capacitance is guaranteed, but not production tested. Total capacitance of a path, when the switch is

closed, is the sum of the switch terminal capacitances.

2001-04-12 Page 2 MDSS-0010-01

Vaishali Semic onductor  747 Camden Avenue, Suite C  Cam pbel l  CA 95008  P h. 408.377.6060  Fax [phone]

5

7

pF

www.vaishali.com