IDT IDTQS3257 User Manual
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IDTQS3257
HIGH-SPEED CMOS QUICKSWITCH QUAD 2:1 MUX/DEMUX
INDUSTRIAL TEMPERATURE RANGE
QUICKSWITCH® PRODUCTS
HIGH-SPEED CMOS
QUICKSWITCH
QUAD 2:1 MUX/DEMUX
FEA TURES:
• Enhanced N channel FET with no inherent diode to Vcc
ΩΩ
•5
Ω bidirectional switches connect inputs to outputs
ΩΩ
• Pin compatible with the 74F257, 74FCT257, and 74FCT257T
• Zero propagation delay, zero ground bounce
• Undershoot clamp diodes on all switch and control inputs
• TTL-compatible control inputs
• Available in SOIC, QSOP, and S1 packages
APPLICA TIONS:
• Logic replacement
• Video, audio, graphics switching, muxing
• Hot-swapping, hot-docking
• Voltage translation (5V to 3.3V)
• Bus funneling
IDTQS3257
DESCRIPTION:
The QS3257 is a high-speed CMOS LVTTL-compatible Quad 2:1
multiplexer/demultiplexer. The QS3257 is a function and pinout compatible
QuickSwitch version of the 74F257, 74FCT257, and the 74ALS/AS/LS257
Quad 2:1 multiplexers. The low ON resistance of the QS3257 allows inputs
to be connected to outputs without adding propagation delay and without
generating additional ground bounce noise.
Mux/Demux devices provide an order of magnitude faster speed than
equivalent logic devices.
The QS3257 is characterized for operation at -40°C to +85°C.
FUNCTIONAL BLOCK DIAGRAM
S
E
Y
A
YB
YC
YD
I0A
I1A
I0B
I1B
I0C
I1C
I0D
I1D
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
2001 Integrated Device Technology, Inc. DSC-5756/6c
FEBRUARY 2001
1
IDTQS3257
HIGH-SPEED CMOS QUICKSWITCH QUAD 2:1 MUX/DEMUX
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
S
I
0A
I1A
YA
I0B
I1B
YB
GND
1
2
3
4
5
6
7
8
SOIC/ QSOP/ S1
TOP VIEW
16
15
14
13
12
11
10
9
VCC
E
I0D
I1D
YD
I0C
I1C
YC
ABSOLUTE MAXIMUM RATINGS
Symbol Description Max Unit
(2)
VTERM
VTERM
VTERM
VAC AC Input Voltage (pulse width ≤ 20ns) –3 V
IOUT DC Output Current 120 mA
PMAX Maximum Power Dissipation (TA = 85°C) 0.5 W
T
STG Storage Temperature –65 to +150 °C
NOTE:
1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause
permanent damage to the device. This is a stress rating only and functional operation
of the device at these or any other conditions above those indicated in the operational
sections of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect reliability.
2. Vcc terminals.
3. All terminals except Vcc.
Supply Voltage to Ground –0.5 to +7 V
(3)
DC Switch Voltage Vs –0.5 to +7 V
(3)
DC Input Voltage VIN –0.5 to +7 V
(1)
CAPACITANCE
(TA = +25°C, f = 1.0MHZ, VIN = 0V, VOUT = 0V)
Pins Typ. Max.
Control Pins 4 5 pF
Quickswitch Channels Demux 5 7 pF
(Switch OFF) Mux 8 9
(1)
Unit
NOTE:
1. This parameter is measured at characterization but not tested.
PIN DESCRIPTION
Pin Names I/O Description
Ixx I Data Inputs
S I Select Input
E I Enable Input
Y
A - YD O Data Outputs
FUNCTION TABLE
Enable Outputs
E SYA YB YC YD Function
H X Hi-Z Hi-Z Hi-Z Hi-Z Disconnected
LLI0A I0B I0C I0D Select 0
LHI
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don't Care
Z = High-Impedance
1A I1B I1C I1D Select 1
(1)
2
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