IDTQS32245SO [IDT]
BUS SWITCH|CMOS|SOP|20PIN|PLASTIC ; BUS开关| CMOS |专科| 20PIN |塑料\n
| 型号： | IDTQS32245SO |
| 厂家： | 
INTEGRATED DEVICE TECHNOLOGY |
| 描述： | BUS SWITCH|CMOS|SOP|20PIN|PLASTIC
|
| 文件： | 总5页 (文件大小：43K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
QUICKSWITCH® PRODUCTS
IDTQS32245
HIGH-SPEED CMOS
QUICKSWITCH
8-BIT BUS SWITCH
DESCRIPTION:
ꢀEATURES:
TheQS32245providesasetofeighthigh-speedCMOSTTL-compatible
bus switches ina pinoutcompatible with74FCT245,74F245,74ALS/AS/
LS2458-bittransceivers. TheOutputEnable(OE)signalturnstheswitches
on similar to the OE signal of the 74’245. The QS32245 has 25Ω series
resistors toreduce groundbounce noise.
QuickSwitchdevices provide anorderofmagnitude fasterspeedthan
conventionallogicdevices.
The QS32245 is characterized for operation at -40°C to +85°C.
• Enhanced N channel FET with no inherent diode to Vcc
• 5Ω bidirectional switches connect inputs to outputs
• Pin compatible with the 74F245, 74FCT245, and 74FCT245T
• Low power CMOS proprietary technology
• Zero propagation delay, zero ground bounce
• Undershoot clamp diodes on all switch and control inputs
• 25Ω resistors for low noise
• TTL-compatible control inputs
• Available in SOIC, QSOP, and TSSOP packages
APPLICATIONS:
• Hot-swapping, hot-docking
• Voltage translation (5V to 3.3V)
• Power conservation
• Capacitance reduction and isolation
• Logic replacement (data processing)
• Clock gating
• Bus switching and isolation
ꢀUNCTIONALBLOCKDIAGRAM
A0
A1
A2
A3
A4
A5
A6
A7
OE
B0
B1
B2
B3
B4
B5
B6
B7
TheIDTlogoisaregisteredtrademarkofIntegratedDeviceTechnology,Inc.
INDUSTRIAL TEMPERATURE RANGE
MARCH 2002
1
c
2002 Integrated Device Technology, Inc.
DSC-5748/1
IDTQS32245
HIGH-SPEEDCMOSQUICKSWITCH8-BITBUSSWITCH
INDUSTRIALTEMPERATURERANGE
ABSOLUTEMAXIMUMRATINGS(1)
PINCONꢀIGURATION
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
1
2
20
19
18
17
16
15
14
13
12
11
VCC
OE
NC
A0
VAC
AC Input Voltage (pulse width ≤ 20ns)
DC Output Current
V
IOUT
PMAX
TSTG
120
mA
W
° C
Maximum Power Dissipation (TA = 85°C)
Storage Temperature
0.5
3
B
B
0
1
A
A
A
1
2
3
–65 to +150
4
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.
5
B2
B3
B4
6
A4
7
A
A
2. Vcc terminals.
3. All terminals except Vcc.
5
6
8
B
5
9
A7
B6
B7
10
GND
SOIC/ QSOP/ TSSOP
TOP VIEW
CAPACITANCE
(TA = +25°C, f = 1.0MHZ, VIN = 0V, VOUT = 0V)
Pins
Typ.
3
Max.(1) Unit
Control Pins
5
7
pF
pF
Quickswitch Channels (Switch OFF)
5
NOTE:
1. This parameter is measured at characterization but not tested.
PINDESCRIPTION
Pin Names
Description
OE
An
Bn
OutputEnable
Data I/Os
Data I/Os
ꢀUNCTION TABLE(1)
OE
H
Outputs
Disconnected
An = Bn
L
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
2
IDTQS32245
HIGH-SPEEDCMOSQUICKSWITCH8-BITBUSSWITCH
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)
—
Max.
—
Unit
V
VIL
—
—
—
18
—
0.8
±1
±1
35
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, Switches OFF
±0.001
23
(3)
RON
VCC = Min., VIN = 0V, ION = 30mA
VCC = Min., VIN = 2.4V, ION =15mA
VIN = VCC = 5V, IOUT = -5µA
18
25
40
VP
PassVoltage(2)
3.7
4
4.2
V
NOTES:
1. Typical values are at VCC = 5.0V, TA = 25°C.
2. Pass Voltage is guaranteed but not production tested.
3. ROUT changed on March 8, 2002. See rear page for more information.
TYPICAL ON RESISTANCE vs VIN AT VCC = 5V
80
RON
(ohms)
70
60
50
40
30
20
10
0
1.5
2.0
2.5
3.0
3.5
1.0
0.0
0.5
VIN
(Volts)
3
IDTQS32245
HIGH-SPEEDCMOSQUICKSWITCH8-BITBUSSWITCH
INDUSTRIALTEMPERATURERANGE
POWERSUPPLYCHARACTERISTICS
Symbol
Parameter
TestConditions(1)
VCC = Max., VIN = GND or Vcc, f = 0
VCC = Max., VIN = 3.4V, f = 0
Max.
3
Unit
µA
ICCQ
QuiescentPowerSupplyCurrent
Power Supply Current per Control Input HIGH (2)
Dynamic Power Supply Current per MHz(3)
∆ICC
1.5
0.25
mA
ICCD
VCC = Max., A and B 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). A and B 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 A and B 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)
Anto/fromBn
—
—
1.25
ns
tPHL
tPZL
SwitchTurn-onDelay
OE to An/Bn
SwitchTurn-offDelay(2)
0.5
0.5
—
—
6.6
4.5
ns
ns
tPZH
tPLZ
tPHZ
OE to An/Bn
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 1.25ns 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
IDTQS32245
HIGH-SPEEDCMOSQUICKSWITCH8-BITBUSSWITCH
INDUSTRIALTEMPERATURERANGE
ORDERINGINꢀORMATION
XX
IDTQS
XXXXX
X
Package
Process
Device Type
Industrial (-40°C to +85°C)
Blank
SO
Q
PA
Small Outline IC
Quarter Size Outline Package
Thin Shrink Small Outline Package
32245
High Speed CMOS Quickswitch 8-Bit Bus Switch
As per PCN L0201-02, the Output Resistance (RON) specifications have changed as of March 8, 2002. The original specifications were:
Parameter
Description
Min.
20
Typ.
28
Max.
40
Unit
RON
VCC = Min, VIN = 0V, ION = 30mA
VCC = Min, VIN = 2.4V, ION = 15mA
Ω
20
35
48
CORPORATE HEADQUARTERS
for SALES:
for Tech Support:
2975StenderWay
Santa Clara, CA 95054
800-345-7015 or 408-727-6116
fax: 408-492-8674
logichelp@idt.com
(408) 654-6459
www.idt.com
5
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