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PDF IDT3VH257S1 Data sheet ( Hoja de datos )

Número de pieza IDT3VH257S1
Descripción QUICKSWITCH PRODUCTS 2.5V/3.3V QUAD 2:1 MUX/DEMUX HIGH BAND WIDTH BUS SWITCH
Fabricantes Integrated Device 
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IDTQS3VH257
2.5V / 3.3V QUAD 2:1 MUX/DEMUX HIGH BANDWIDTH BUS SWITCH
INDUSTRIALTEMPERATURERANGE
QUICKSWITCH® PRODUCTS 2.5V/3.3V IDTQS3VH257
QUAD 2:1 MUX/DEMUX HIGH BAND-
WIDTH BUS SWITCH
FEATURES:
• N channel FET switches with no parasitic diode to VCC
– Isolation under power-off conditions
– No DC path to VCC or GND
– 5V tolerant in OFF and ON state
• 5V tolerant I/Os
• Low RON - 4typical
• Flat RON characteristics over operating range
• Rail-to-rail switching 0 - 5V
• Bidirectional dataflow with near-zero delay: no added ground
bounce
• Excellent RON matching between channels
• VCC operation: 2.3V to 3.6V
• High bandwidth - up to 500MHz
• LVTTL-compatible control Inputs
• Undershoot Clamp Diodes on all switch and control Inputs
• Low I/O capacitance, 4pF typical
• Available in QSOP, SOIC, and TSSOP packages
APPLICATIONS:
• Hot-swapping
• Multiplexing/demultiplexing
• Low distortion analog switch
• Replaces mechanical relay
• ATM 25/155 switching
FUNCTIONAL BLOCK DIAGRAM
S
DESCRIPTION:
The QS3VH257 HotSwitch Quad 2:1 multiplexer/demultiplexer is a high
bandwidth bus switch. The QS3VH257 has very low ON resistance, resulting
in under 250ps propagation delay through the switch. The Select (S) input
controlsthedataflow. Themultiplexers/demultiplexersareenabledwhenthe
Enable(E)inputislow. IntheONstate,theswitchescanpasssignalsupto5V.
In the OFF state, the switches offer very high impedence at the terminals.
The combination of near-zero propagation delay, high OFF impedance, and
over-voltage tolerance makes the QS3VH257 ideal for high performance
communicationapplications.
The QS3VH257 is characterized for operation from -40°C to +85°C.
E
YA
YB
YC
YD
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
c 2003 Integrated Device Technology, Inc.
1
I0A
I1A
I0B
I1B
I0C
I1C
I0D
I1D
MARCH 2003
DSC-5596/11

1 page




IDT3VH257S1 pdf
IDTQS3VH257
2.5V / 3.3V QUAD 2:1 MUX/DEMUX HIGH BANDWIDTH BUS SWITCH
INDUSTRIALTEMPERATURERANGE
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
TA = -40°C to +85°C
VCC = 2.5 ± 0.2V (1)
VCC = 3.3 ± 0.3V (1)
Symbol
tPLH
tPHL
tSEL
Parameter
Data Propagation Delay(2,3)
Yx to Ixx or Ixx to Yx
Select Time
S to Yx
Min. (4)
1.5
Max. Min. (4)
0.2
9 1.5
Max.
0.2
8
tPZH EnableTime
tPZL S to Ixx
1.5
9 1.5
9
tPHZ DisableTime
tPLZ S to Ixx
tPZH EnableTime
tPZL E to Yx or Ixx
tPHZ DisableTime
tPLZ E to Yx or Ixx
1.5
8 1.5
8
1.5
9 1.5
8
1.5
8 1.5
8
fEorS Operating Frequency - Enable(2,5)
10
20
Unit
ns
ns
ns
ns
ns
ns
MHz
NOTES:
1. See Test Conditions under TEST CIRCUITS AND WAVEFORMS.
2. This parameter is guaranteed but not production tested.
3. The bus switch contributes no propagation delay other than the RC delay of the ON resistance of the switch and the load capacitance. The time constant for the switch alone
is of the order of 0.2ns at CL = 50pF. Since this time constant is much smaller than the rise and fall times of typical driving signals, it adds very little propagation delay to the
system. Propagation delay of the bus switch, when used in a system, is determined by the driving circuit on the driving side of the switch and its interaction with the load on
the driven side.
4. Minimums are guaranteed but not production tested.
5. Maximum toggle frequency for S or E control input (pass voltage > VCC, VIN = 5V, RLOAD 1M, no CLOAD).
5

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