IDTQS3251 [IDT]
QUICKSWITCH PRODUCTS HIGH-SPEED CMOS QUICKSWITCH 8:1 MUX/DEMUX; 快速切换产品高速CMOS快速切换8 ： 1复用器/解复用器
| 型号： | IDTQS3251 |
| 厂家： | 
INTEGRATED DEVICE TECHNOLOGY |
| 描述： | QUICKSWITCH PRODUCTS HIGH-SPEED CMOS QUICKSWITCH 8:1 MUX/DEMUX |
| 文件： | 总5页 (文件大小：47K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
QUICKSWITCH® PRODUCTS
IDTQS3251
HIGH-SPEED CMOS
QUICKSWITCH 8:1 MUX/DEMUX
FEATURES:
DESCRIPTION:
• Enhanced N channel FET with no inherent diode to Vcc
• 5Ω bidirectional switches connect inputs to outputs
• Pin compatible with the 74F251, 74FCT251, and 74FCT251T
• Zero propagation delay, zero ground bounce
• Undershoot clamp diodes on all switch and control inputs
• TTL-compatible control inputs
The QS3251 is a high-speed CMOS TTL-compatible 8:1 multiplexer/
demultiplexer. The QS3251has3-stateoutputs. TheQS3251isafunction
and pinout compatible version of the 74F251, 74FCT251 and the 74ALS/
AS/LS251 8:1 multiplexers. The low ON resistance of the QS3251 allows
inputs to be connected to outputs without adding propagation delay and
without generating additional ground bounce noise.
• Available in SOIC and QSOP packages
Mux/Demux devices provide an order of magnitude faster speed than
equivalent logic devices.
The QS3251 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)
FUNCTIONALBLOCKDIAGRAM
S0
S1
S2
E
I0
I1
I2
I3
I4
I5
I6
I7
Y
TheIDTlogoisaregisteredtrademarkofIntegratedDeviceTechnology,Inc.
INDUSTRIAL TEMPERATURE RANGE
FEBRUARY 2000
1
c
2000 Integrated Device Technology, Inc.
DSC-5754/1
IDTQS3251
HIGH-SPEEDCMOSQUICKSWITCH8:1MUX/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)
VTERM
DC Input Voltage VIN
V
VCC
I3
I2
1
2
3
16
15
14
VAC
AC Input Voltage (pulse width ≤ 20ns)
DC Output Current
V
IOUT
PMAX
TSTG
120
mA
W
I4
I5
Maximum Power Dissipation (TA = 85°C)
Storage Temperature
0.5
–65 to +150
°C
I1
NOTE:
I6
I0
4
5
6
13
12
11
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.
I7
Y
NC
S0
S1
S2
2. Vcc terminals.
3. All terminals except Vcc.
E
7
8
10
9
GND
CAPACITANCE (TA = +25°C, f = 1MHz, VIN = 0V, VOUT = 0V)
Pins
Typ.
Max.(1)
Unit
ControlInputs
4
5
pF
QuickswitchChannels
(Switch OFF)
Demux
Mux
5
21
7
23
pF
SOIC/ QSOP
TOP VIEW
NOTE:
1. This parameter is guaranteed but not production tested.
FUNCTIONTABLE(1)
PINDESCRIPTION
Select
Pin Names
I/O
Description
E
S2
X
L
S1
X
L
S0
X
L
Y
Hi-Z
I0
Function
I0 - I7
S0 - S2
E
I
I
DataInputs
SelectInputs
EnableInput
DataOutput
H
Disable
L
S2 - S 0 = 0
S2 - S 0 = 1
S2 - S 0 = 2
S2 - S 0 = 3
S2 - S 0 = 4
S2 - S 0 = 5
S2 - S 0 = 6
S2 - S 0 = 7
I
L
L
L
H
L
I1
Y
O
L
L
H
H
L
I2
L
L
H
L
I3
L
H
H
H
H
I4
L
L
H
L
I5
L
L
H
H
I6
H
I7
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
Z = High-Impedence
2
IDTQS3251
HIGH-SPEEDCMOSQUICKSWITCH8:1MUX/DEMUX
INDUSTRIALTEMPERATURERANGE
DCELECTRICALCHARACTERISTICSOVEROPERATINGRANGE
FollowingConditionsApplyUnlessOtherwiseSpecified:
Industrial: TA = –40°C to +85°C, VCC = 5.0V ±5%
Symbol
VIH
Parameter
Input HIGH Level
Test Conditions
Guaranteed Logic HIGH for Control Pins
Guaranteed Logic LOW for Control Pins
0V ≤ VIN ≤ VCC
Min.
2
Typ.(1)
—
Max.
—
Unit
V
VIL
Input LOW Level
—
—
0.8
±1
±1
7
V
IIN
Input LeakageCurrent (Control Inputs)
Off-State Output Current (Hi-Z)
Switch ON Resistance(2)
—
—
µA
µA
Ω
IOZ
0V ≤ VOUT ≤ VCC
—
—
RON
VCC = Min., VIN = 0V, ION = 30mA
VCC = Min., VIN = 2.4V, ION =15mA
VIN = VCC = 5V, IOUT = -5µA
—
5
—
10
15
VP
PassVoltage(3)
3.7
4
4.2
V
NOTES:
1. Typical values are at VCC = 5.0V, TA = 25°C.
2. RON is guaranteed but not production tested.
3. Pass Voltage is guaranteed but not production tested.
TYPICAL ON RESISTANCE vs VIN AT VCC = 5V
16
RON
(ohms)
14
12
10
8
6
4
2
0
1.5
2.0
2.5
3.0
3.5
1.0
0.0
0.5
VIN
(Volts)
3
IDTQS3251
HIGH-SPEEDCMOSQUICKSWITCH8:1MUX/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
Quiescent Power Supply Current
Power Supply Current per Control Input HIGH (2)
Dynamic Power Supply Current per MHz(3)
∆ICC
1.5
mA
ICCD
VCC = Max., I and Y pins open
0.25
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 ∆Icc.
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.
Unit
DataPropagationDelay(2,3)
Ix to Y
—
—
0.25
ns
tPHL
tPZL
SwitchTurn-onDelay
Sx to Y
0.5
0.5
0.5
—
—
—
6.6
6
ns
ns
ns
tPZH
tPZL
SwitchTurn-onDelay
E to Y
SwitchTurn-offDelay(2)
tPZH
tPLZ
6
tPHZ
E 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
IDTQS3251
HIGH-SPEEDCMOSQUICKSWITCH8:1MUX/DEMUX
INDUSTRIALTEMPERATURERANGE
ORDERINGINFORMATION
XX
IDTQS
XXXXX
Package
Device Type
S1
Q
Small Outline IC
Quarter Size Outline Package
3251
High Speed CMOS Quickswitch 8:1 Mux/Demux
CORPORATE HEADQUARTERS
2975StenderWay
Santa Clara, CA 95054
for SALES:
800-345-7015 or 408-727-6116
fax: 408-492-8674
www.idt.com
for Tech Support:
logichelp@idt.com
(408) 654-6459
5
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