VS32X245 / VS32X2245
High Speed CMOS VSwitch
16-Bit Bus Switches
Applications
鈥?
鈥?
5V to 3.3V translation in mixed-supply environment
Hot-swap interface
鈥?
鈥?
Logic replacement
Bus isolation
General Description
The VS32X245 and VS32X2245 are high-speed TTL-compatible 16-bit bus switches in a flow-through pinout.
Each device contains two banks of 8-bit switches with a common active-LOW enable (/OEx) for each bank.
The low ON resistance of the VS32X245 allows inputs to be connected to outputs, without adding
propagation delay and without generating additional signal noise. The VS32X2245 has 25鈩?resistors in series
with the switches to reduce ground-bounce noise from the driving source and signal reflection.
The VS32X245 and VS32X2245 bus switches are function and pinout compatible with QS32X245 and
QS32X2245 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 鈥榙isable鈥?mode makes these switches ideal interface elements for hot-
swap applications.
Features
鈥?
Enhanced N-FET with no DC path to V
CC
or GND in normal operating signal voltage
range.
Low impedance bidirectional data flow:
5鈩?(VS32X245) and 25鈩?(VS32X2245)
Pin-compatible with QS32X245 and
QS32X2245 switches.
Near-zero propagation delay
鈥?
鈥?
鈥?
鈥?
鈥?
鈥?
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 40 pin QSOP
package
鈥?
鈥?
鈥?
Figure 1. Functional Block Diagram
A0 A1 A2 A3 A4 A5
A6 A7
Figure 2. Pin Configuration
QSOP
(All Pins Top View)
NC
A0
A1
A2
A3
A4
A5
A6
A7
GND
NC
A8
A9
A10
A11
A12
A13
A14
A15
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
V
CC
/OE1
B0
B1
B2
B3
B4
B5
B6
B7
V
CC
/OE2
B8
B9
B10
B11
B12
B13
B14
B15
/OE1
B0 B1 B2 B3 B4 B5 B6 B7
A8 A9 A10 A11 A12 A13 A14 A15
/OE2
B8 B9 B10 B11 B12 B13 B14 B15
2001-04-12
Vaishali Semiconductor
Page 1
www.vaishali.com
747 Camden Avenue, Suite C Campbell CA 95008
MDSS-0013-01
Ph. 408.377.6060
Fax 408.377.6063
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