Vaishali Semiconductor VS3257Q, VS32257Q Datasheet
VS3257 / VS32257
A
A
(
)
Quad 2:1 Mux/Demux VSwitch
Applications
•= 5V to 3.3V translation in mixed-supply
environment
•= Hot-swap interface
•= Logic replacement
General Description
The VS3257 is a high-speed TT L–c ompatible Quad 2:1 multiplexer/dem ultiplex er . T he VS3257 c ontains four
mux/demux channels, with a com mon path c ontrol (S) and active low enable (/E). T he low ON resis tance of
the VS3257 allows inputs to be connected to outputs, without adding propagation delay and without
generating additional signal noise. The VS32257 has 25Ω resistors in series with the switches to reduce
ground-bounce noise and signal reflection.
The VS3257 and VS32257 mux/demux switches are function and pinout compatible with QS3257 and
CBT3257 switches. They enable 5V to 3.3V translation when used with an external diode in the power supply
line. In addition, the high off-isolation in the ‘disable’ mode makes VS3257 and VS32257 ideal interface
elements for hot-swap applications.
•= Memory bank, video, & audio
swtiching
•= Power conservation
Features
•= Enhanced N-FET with no DC path to VCC
or GND in normal operating signal voltage
range.
•= Low impedance bidirectional data flow:
5Ω (VS3257) and 25Ω (VS32257)
•= Pin-compatible with QS3257 and CBT3257
switches.
•= Near zero propagation delay
•= Break-before-make feature
•= 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
•= Zero added ground bounce or signal noise
Figure 1. Functional Block Diagram Figure 2. Pin Configuration
All Pins Top View
S
QSOP
/E
S
1
I0
2
A
I1
3
A
Y
4
A
I0
B
5
I1
B
6
Y
B
7
8
Y
Y
Y
Y
A
B
C
D
I0
I0
I1
I0
I1
I1
I0
I1
B
B
C
C
D
D
GND
16
15
14
13
12
11
10
V
CC
/E
I0
D
I1
D
Y
D
I0
C
I1
C
9
Y
C
2001-04-12 Page 1 MDSS-0009-01
Vaishali Semic onductor 747 Camden Avenue, Suite C Cam pbel l CA 95008 P h. 408.377.6060 Fax 408.377.6063
www.vaishali.com
VS3257/VS32257
Table 1. Pin Description
Name I/O Description
I0X, I1X I/O Data Input or Output
S I Select Input
/E I Enable Input
YA - YD I/O Data Output or Input
Table 2. Function Table
Inputs Path Function
/E S
H X Hi Impedance Disable all switches
L L IOX <-> YX Select 0
L H I1X <-> YX Select 1
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 while 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 Operation Typ Max Unit
Control Inputs 4 5 pF
VSwitch Channels Demux 5 7 pF
(Switch OFF) Mux 7 8 pF
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-0009-01
www.vaishali.com
Vaishali Semic onductor 747 Camden Avenue, Suite C Cam pbel l CA 95008 P h. 408.377.6060 Fax 408.377.6063
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