VS3V257 / VS3V2257
High-speed 3.3V CMOS VSwitch
Quad 2:1 Mux/Demux
Applications
鈥?
鈥?
鈥?
3.3V to 2.5V translation
2.5V to 1.8V translation
Hot-Swapping
鈥?
鈥?
Logic replacement
Memory bank, video, and audio
switching
General Description
The VS3V257 is a high-speed LVTTL鈥揷ompatible Quad 2:1 multiplexer/demultiplexer. The VS3V257
contains four mux/demux channels, with a common path control (S) and active low enable (/E). The low ON
resistance of the VS3V257 allows inputs to be connected to outputs, without adding propagation delay and
without generating additional signal noise. The VS3V2257 has 25鈩?resistors in series with the switches to
reduce ground-bounce noise and signal reflection.
The VS3V257 and VS3V2257 are designed for 3.3V to 2.5V or 2.5V to 1.8V level translation, without any
external components. These switches also offer very high impedance between switch terminals in the
power-off or 鈥渄isabled鈥?state. This feature, combined with near-zero propagation delay in the 鈥渙n鈥?state,
makes VS3V257 and VS3V2257 ideal interface elements for hot-swapping applications.
Features
鈥?
Enhanced N-FET with no DC path to V
CC
or GND in normal operating signal voltage
range.
Low impedance switches connect inputs to
outputs with near-zero propagation delay:
5鈩?(VS3V257) and 25鈩?(VS3V2257)
Pin-compatible with 74LVC257 or
equivalent logic devices
Zero added ground bounce or signal noise
鈥?
鈥?
鈥?
鈥?
鈥?
鈥?
Break-before-make feature
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
鈥?
鈥?
鈥?
Figure 1. Functional Block Diagram
Figure 2. Pin Configuration
S
/E
Y
A
Y
B
Y
C
Y
D
I0
A
I1
A
I0
B
I1
B
I0
C
I1
C
I0
D
I1
D
S
I0
A
I1
A
Y
A
I0
B
I1
B
Y
B
GND
1
2
3
4
5
6
7
8
QSOP
16
15
14
13
12
11
10
9
V
CC
/E
I0
D
I1
D
Y
D
I0
C
I1
C
Y
C
(All Pins Top View)
2000-11-28
Vaishali Semiconductor
Page 1
www.vaishali.com
747 Camden Avenue, Suite C Campbell CA 95008
MDSS-0001-01
Ph. 408.377.6060
Fax 408.377.6063
1
2
3
4
5
6
