IDTQS3257SO8 [IDT]
Multiplexer And Demux/Decoder, 4-Func, 1 Line Input, 2 Line Output, True Output, CMOS, PDSO16, PLASTIC, SOIC-16;
| 型号： | IDTQS3257SO8 |
| 厂家： | 
INTEGRATED DEVICE TECHNOLOGY |
| 描述： | Multiplexer And Demux/Decoder, 4-Func, 1 Line Input, 2 Line Output, True Output, CMOS, PDSO16, PLASTIC, SOIC-16 光电二极管 逻辑集成电路 |
| 文件： | 总5页 (文件大小：50K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
QUICKSWITCH® PRODUCTS
HIGH-SPEED CMOS
QUICKSWITCH
QUAD 2:1 MUX/DEMUX
IDTQS3257
FEATURES:
DESCRIPTION:
• Enhanced N channel FET with no inherent diode to Vcc
• 5Ω bidirectional switches connect inputs to outputs
• 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
The QS3257 is a high-speed CMOS LVTTL-compatible Quad 2:1
multiplexer/demultiplexer.TheQS3257isafunctionandpinoutcompatible
QuickSwitchversionofthe74F257,74FCT257,andthe74ALS/AS/LS257
Quad2:1multiplexers.ThelowONresistanceoftheQS3257allowsinputs
tobe connectedtooutputs withoutaddingpropagationdelayandwithout
generatingadditionalgroundbounce noise.
• Available in SOIC, QSOP, and S1 packages
Mux/Demux devices provide an order of magnitude faster speed than
equivalentlogicdevices.
The QS3257 is characterized for operation at -40°C to +85°C.
APPLICATIONS:
• Logic replacement
• Video, audio, graphics switching, muxing
• Hot-swapping, hot-docking
• Voltage translation (5V to 3.3V)
• Bus funneling
FUNCTIONALBLOCKDIAGRAM
S
E
I0A
I1A
I0B
I1B
I0C
I1C
I0D
I1D
YA
YB
YC
YD
TheIDTlogoisaregisteredtrademarkofIntegratedDeviceTechnology,Inc.
INDUSTRIAL TEMPERATURE RANGE
FEBRUARY 2001
1
c
2001 Integrated Device Technology, Inc.
DSC-5756/8
IDTQS3257
HIGH-SPEEDCMOSQUICKSWITCHQUAD2:1MUX/DEMUX
INDUSTRIALTEMPERATURERANGE
ABSOLUTEMAXIMUMRATINGS(1)
PINCONFIGURATION
Symbol
Description
Supply Voltage to Ground
DC Switch Voltage Vs
Max
–0.5 to +7
–0.5 to +7
–0.5 to +7
–3
Unit
V
(2)
VTERM
(3)
VTERM
V
(3)
1
VTERM
DC Input Voltage VIN
V
S
16
15
VCC
VAC
AC Input Voltage (pulse width ≤ 20ns)
DC Output Current
V
I0A
2
3
4
5
6
7
8
E
I0D
IOUT
PMAX
TSTG
120
mA
W
° C
Maximum Power Dissipation (TA = 85°C)
Storage Temperature
0.5
I1A
YA
14
13
12
11
10
9
–65 to +150
I1D
YD
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.
I0B
I0C
I1B
YB
2. Vcc terminals.
3. All terminals except Vcc.
I1C
YC
GND
CAPACITANCE
(TA = +25°C, f = 1.0MHZ, VIN = 0V, VOUT = 0V)
SOIC/ QSOP/ S1
TOP VIEW
Pins
Typ.
Max.(1)
Unit
pF
ControlPins
4
5
8
5
7
9
QuickswitchChannels
(Switch OFF)
Demux
Mux
pF
NOTE:
1. This parameter is measured at characterization but not tested.
PINDESCRIPTION
Pin Names
I/O
I
Description
Ixx
DataInputs
SelectInput
EnableInput
DataOutputs
S
E
I
I
YA - YD
O
FUNCTIONTABLE(1)
Enable
Outputs
E
H
S
YA
Hi-Z
I0A
YB
YC
YD
Hi-Z
I0D
Function
Disconnected
Select0
X
L
Hi-Z Hi-Z
L
I0B
I1B
I0C
I1C
L
H
I1A
I1D
Select1
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don't Care
Z = High-Impedance
2
IDTQS3257
HIGH-SPEEDCMOSQUICKSWITCHQUAD2:1MUX/DEMUX
INDUSTRIALTEMPERATURERANGE
DCELECTRICALCHARACTERISTICSOVEROPERATINGRANGE
FollowingConditionsApplyUnlessOtherwiseSpecified:
Industrial: TA = –40°C to +85°C, VCC = 5.0V ±5%
Symbol
VIH
Parameter
Input HIGH Level
Input LOW Level
Test Conditions
Guaranteed Logic HIGH for Control Pins
Guaranteed Logic LOW for Control Pins
Min.
2
Typ.(1)
—
—
—
—
5
Max.
—
0.8
1
Unit
V
VIL
—
—
—
—
—
3.7
V
(2)
IIN
Input LeakageCurrent (Control Inputs) 0V ≤ VIN ≤ VCC
µA
µA
Ω
IOZ
Off-State Output Current (Hi-Z)
Switch ON Resistance
0V ≤ VOUT ≤ VCC
1
RON
VCC = Min., VIN = 0V, ION = 30mA
VCC = Min., VIN = 2.4V, ION =15mA
VIN = VCC = 5V, IOUT = -5μA
7
10
15
4.2
VP
PassVoltage(2)
4
V
NOTES:
1. Typical values are at VCC = 5.0V, TA = 25°C.
2. Pass Voltage is guaranteed but not production tested.
TYPICAL ON RESISTANCE vs VIN AT VCC = 5V
16
14
12
10
8
RON
(ohms)
6
4
2
0
0.0
1.5
2.0
2.5
3.0
3.5
1.0
0.5
VIN
(Volts)
3
IDTQS3257
HIGH-SPEEDCMOSQUICKSWITCHQUAD2:1MUX/DEMUX
INDUSTRIALTEMPERATURERANGE
POWERSUPPLYCHARACTERISTICS
Symbol
ICCQ
Parameter
TestConditions(1)
VCC = Max., VIN = GND or Vcc, f = 0
VCC = Max., VIN = 3.4V, f = 0
Max.
3
Unit
μA
QuiescentPowerSupplyCurrent
Power Supply Current per Control Input HIGH (2)
Dynamic Power Supply Current per MHz(3)
ΔICC
1.5
0.25
mA
ICCD
VCC = Max., I and Y pins open
mA/MHz
Control Inputs Toggling at 50% Duty Cycle
NOTES:
1. For conditions shown as Min. or Max., use the appropriate values specified under DC Electrical Characteristics.
2. Per TLL driven input (VIN = 3.4V, control inputs only). I and Y pins do not contribute to ΔIcc.
3. This current applies to the control inputs only and represents the current required to switch internal capacitance at the specified frequency. The I and Y inputs generate no significant
AC or DC currents as they transition. This parameter is guaranteed but not production tested.
SWITCHINGCHARACTERISTICSOVEROPERATINGRANGE
TA = -40°C to +85°C, VCC = 5.0V ± 5%;
CLOAD = 50pF, RLOAD = 500Ω unless otherwise noted.
Symbol
tPLH
Parameter
Min.(1)
Typ.
Max.
0.25(3)
Unit
DataPropagationDelay(2,3)
Ix to Y
—
—
ns
tPHL
tPZH
tPZL
SwitchTurn-onDelay
Sx to Y
0.5
0.5
0.5
—
—
—
5.2
4.8
5
ns
ns
ns
tPZH
tPZL
SwitchTurn-onDelay
Ex to Y
SwitchTurn-offDelay(2)
tPHZ
tPLZ
Ex to Y, Sx to Y
NOTES:
1. Minimums are guaranteed but not production tested.
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 0.25ns for 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
IDTQS3257
HIGH-SPEEDCMOSQUICKSWITCHQUAD2:1MUX/DEMUX
INDUSTRIALTEMPERATURERANGE
ORDERINGINFORMATION
XX
IDTQS
XXXXX
Package
Device Type
SO
Q
Small Outline IC
Quarter Size Outline Package
QG
S1
QSOP - Green
Small Outline IC
S1G
SOIC - Green
3257
High Speed CMOS Quickswitch Quad 2:1 Mux/Demux
CORPORATE HEADQUARTERS
for SALES:
for Tech Support:
6024 Silver Creek Valley Road
San Jose, CA 95138
800-345-7015 or 408-284-8200
fax: 408-284-2775
logichelp@idt.com
www.idt.com
5
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