QS3257SO8 [IDT]
Logic Circuit, CMOS, PDSO16;
| 型号： | QS3257SO8 |
| 厂家： | 
INTEGRATED DEVICE TECHNOLOGY |
| 描述： | Logic Circuit, CMOS, PDSO16 光电二极管 |
| 文件： | 总5页 (文件大小：78K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
QUICKSWITCH® PRODUCTS
IDTQS3257
HIGH-SPEED CMOS
QUICKSWITCH
QUAD 2:1 MUX/DEMUX
FEATURES:
DESCRIPTION:
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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 QSOP, SOIC, and S1 Packages
Mux/Demux devices provide an order of magnitude faster speed than
equivalentlogicdevices.
APPLICATIONS:
The QS3257 is characterized for operation at -40°C to +85°C.
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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
B
Y
YC
YD
TheIDTlogoisaregisteredtrademarkofIntegratedDeviceTechnology,Inc.
INDUSTRIAL TEMPERATURE RANGE
NOVEMBER 2001
1
c
2001 Integrated Device Technology, Inc.
DSC-5756/3
IDTQS3257
HIGH-SPEEDCMOSQUICKSWITCHQUAD2:1MUX/DEMUX
INDUSTRIALTEMPERATURERANGE
ABSOLUTE MAXIMUM RATINGS (1)
PINCONFIGURATION
Symbol
Description
Max.
Unit
(2)
Supply Voltage to Ground
– 0.5 to +7
V
VTERM
(3)
DC Switch Voltage VS
– 0.5 to +7
– 0.5 to +7
-3
V
V
VTERM
(3)
DC Input Voltage VIN
1
2
3
4
5
6
7
8
S
16
15
VCC
VTERM
VAC
AC Input Voltage (pulse width ≤20ns)
DC Output Current
V
I0A
E
IOUT
PMAX
TSTG
120
mA
W
Maximum Power Dissipation (TA = 85°C)
Storage Temperature
0.5
I0D
I1A
YA
14
13
12
11
10
9
– 65 to +150 °C
SO16-1
SO16-7
SO16-8
I1D
YD
NOTES:
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.
I0B
I0C
I1B
YB
I1C
YC
3. All terminals except Vcc.
GND
CAPACITANCE
(TA = +25OC, f = 1.0MHz, VIN = 0V, VOUT = 0V)
Pins
Typ.
Max. (1)
Unit
Control Pins
4
5
pF
SOIC/ QSOP/ S1
TOP VIEW
Quickswitch Channels
(Switch OFF)
Demux
Mux
5
8
7
9
pF
pF
NOTE:
1. This parameter is guaranteed but not production tested.
PIN DESCRIPTION
Pin Names
I/O
Description
Data Inputs
Ixx
I
S
E
I
I
Select Input
Enable Input
Data Outputs
YA - YD
O
FUNCTION TABLE(1)
Inputs
Outputs
E
S
YA
Z
YB
Z
YC
YD
Z
Function
H
L
X
L
H
Z
Disconnected
Select 0
I0A
I1A
I0B
I1B
I0C
I1C
I0D
I1D
L
Select 1
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
Z = High-Impedence
2
IDTQS3257
HIGH-SPEEDCMOSQUICKSWITCHQUAD2:1MUX/DEMUX
INDUSTRIALTEMPERATURERANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Industrial: TA = -40°C to +85°C, VCC = 5.0V ± 5%
Symbol
Parameter
Input HIGH Voltage
Test Conditions
Min. Typ.(1) Max.
Unit
VIH
Guaranteed Logic HIGH for Control Pins
2
—
—
—
—
5
—
0.8
±1
±1
7
V
VIL
IIN
Input LOW Voltage
Guaranteed Logic LOW for Control Pins
0V ≤ VIN ≤ Vcc
—
—
—
—
—
3.7
V
µA
µA
Ω
Input Leakage Current (Control Inputs)
Off-State Current (Hi-Z)
Switch ON Resistance
Switch ON Resistance
Pass Voltage (2)
IOZ
RON
RON
VP
0V ≤ VOUT ≤ Vcc
Vcc = Min., VIN = 0V, ION = 30mA
Vcc = Min., VIN = 2.4V, ION = 15mA
VIN = Vcc = 5V, IOUT = -5µA
10
4
15
4.2
Ω
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
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
IDTQS3257
HIGH-SPEEDCMOSQUICKSWITCHQUAD2:1MUX/DEMUX
INDUSTRIALTEMPERATURERANGE
POWER SUPPLY CHARACTERISTICS
Symbol
Parameter
Test Conditions(1)
Max.
Unit
ICCQ
Quiescent Power Supply Current
VCC = Max., VIN = GND or Vcc, f = 0
3
µA
∆ICC
Power Supply Current per Control Input HIGH (2)
Dynamic Power Supply Current per MHz(3)
VCC = Max., VIN = 3.4V, f = 0
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.
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
TA = -40°C to +85°C, VCC = 5.0V ± 5%
LOAD
C
LOAD
= 50pF, R
Ω
= 500 unless otherwise noted.
Min. (1)
Typ.
Max.
Symbol
tPLH
Parameter
Unit
Data Propagation Delay (2,3)
In to Y
—
—
0.25
ns
tPHL
tPZH
tPZL
Switch Turn-on Delay
Sn to Y
0.5
0.5
0.5
—
—
—
5.2
4.8
5
ns
ns
ns
tPZH
tPZL
Switch Turn-on Delay
EN to Y
Switch Turn-off Delay (2)
tPHZ
tPLZ
EN to Y, Sn 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
S1
Small Outline IC (SO16-1)
Quarter Size Outline Package (SO16-7)
Quarter Size Outline Package (SO16-8)
3257
High Speed CMOS Quickswitch Quad 2:1 Mux/Demux
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logichelp@idt.com
(408) 654-6459
www.idt.com
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