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PDF VS32257Q Data sheet ( Hoja de datos )

Número de pieza VS32257Q
Descripción Quad 2:1 Mux/Demux VSwitch
Fabricantes Vaishali Semiconductor 
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No Preview Available ! VS32257Q Hoja de datos, Descripción, Manual

VS3257 / VS32257
Quad 2:1 Mux/Demux VSwitch
Applications
= 5V to 3.3V translation in mixed-supply
environment
= Hot-swap interface
= Logic replacement
= Memory bank, video, & audio
swtiching
= Power conservation
General Description
The VS3257 is a high-speed TTL–compatible Quad 2:1 multiplexer/demultiplexer. The VS3257 contains four
mux/demux channels, with a common path control (S) and active low enable (/E). The low ON resistance of
the VS3257 allows inputs to be connected to outputs, without adding propagation delay and without
generating additional signal noise. The VS32257 has 25resistors 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.
Features
= Enhanced N-FET with no DC path to VCC
or GND in normal operating signal voltage
range.
= Low impedance bidirectional data flow:
5(VS3257) and 25(VS32257)
= Pin-compatible with QS3257 and CBT3257
switches.
= Near zero propagation delay
= Zero added ground bounce or signal noise
= 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
Figure 1. Functional Block Diagram
S
/E
YA
YB
YC
YD
Figure 2. Pin Configuration
(All Pins Top View)
QSOP
I0A
I1A
I0B
I1B
I0C
I1C
I0D
I1D
S
I0A
I1A
YA
I0B
I1B
YB
GND
1
2
3
4
5
6
7
8
16 VCC
15 /E
14 I0D
13 I1D
12 YD
11 I0C
10 I1C
9 YC
2001-04-12
Page 1
MDSS-0009-01
www.vaishali.com
Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063

1 page




VS32257Q pdf
VS3257/VS32257
Table 8. Switching Characteristics Over Operating Range
TA = -40oC to +85oC, VCC = 5.0V + 10%
CLOAD = 50pF, RLOAD = 500unless otherwise stated.
Symbol
tPLH, tPHL
Description (1)
Data Propagation Delay (2,3) through the switch
VS3257
Min(3) Max
0.25
tPZH, tPZL
Switch Turn-on Delay, S to YX, I0X, or I1X
0.5 5.2
tPZH, tPZL
Switch Turn-on Delay, /E to YX, I0X, or I1X
0.5 4.8
tPLZ, tPHZ
Switch Turn-off Delay (3), S or /E to YX, I0X, or I1X
0.5 5.0
VS32257
Min(3) Max
1.25
0.5 6.2
0.5 5.8
0.5 5.0
Units
ns
ns
ns
ns
Notes:
1. See test circuits and waveforms.
2. This parameter is the calculated theoretical RC time constant of ON-state resistance of the switch and the specified load
capacitance when driven by an ideal voltage source (zero source impedance). This time-constant is on the order of 0.25 ns for
VS3257 and 1.25 ns for VS32257. Since this time-constant is much smaller than rise/fall times of typical driving signals, it adds
very little propagation delay to the system.
3. This parameter is guaranteed, but not production tested.
Figure 6. AC Test Circuit and Switching Waveforms
AC Test Circuit
Pulse
Generator
VIN VOUT
DUT
50
CL
Load Switch Position
S1
7V
500
450
RL
50=Coax to
Oscilloscope
TEST
tPLH, tPHL
tPLZ, tPZL
tPHZ, tPZH
S1
Open
Closed
Open
Input Conditions
Input voltage = 0 V to 3.0 V
tr = tf = 2.5ns (10% to 90%)
2001-04-12
Page 5
MDSS-0009-01
www.vaishali.com
Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063

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