IDTQS3V245Q [IDT]
QUICKSWITCH PRODUCTS 3.3V HIGH SPEED BUS SWITCH; 快速切换产品3.3V高速总线开关
| 型号： | IDTQS3V245Q |
| 厂家： | 
INTEGRATED DEVICE TECHNOLOGY |
| 描述： | QUICKSWITCH PRODUCTS 3.3V HIGH SPEED BUS SWITCH |
| 文件： | 总7页 (文件大小：56K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
QUICKSWITCH® PRODUCTS
IDTQS3V245
3.3V HIGH SPEED BUS SWITCH
FEATURES:
DESCRIPTION:
• 5Ω bi-directional switches connect inputs to outputs
• Pin compatibility with QS3245
The QS3V245 is an 8-bit high speed bus switch controlled by LVTTL-
compatibleactivelowenablesignal.Whenclosed,theswitchesexhibitnear
zero propagation delay without generating additional ground bounce or
switchingnoise.
• 250ps propagation delay
• Undershoot Clamp Diodes on all switch and control Inputs
• LVTTL-compatible control Inputs
TheQS3V245isspeciallydesignedfordirectinterfacebetween3.3Vand
2.5Vdeviceswithoutanyexternalcomponents.Whenoperatingfroma3.3V
supply, thelogichighlevelattheswitchoutputisclampedto2.5Vwhenthe
switchinputsignalexceeds2.5V.Thisdevicecanbeusedforswitching2.5V
buseswithoutsignalattenuation.TheONresistanceat3.3VVCC islessthan
5Ω typical, providing near zero propagation delay through the switch.
AbsenceofDCpathfromswitchI/OpinstoVCC orgroundmakesQS3V245
an ideal device for hot swapping applications.
• Available in SOIC and QSOP packages
APPLICATIONS:
• 3.3V to 2.5V voltage translation
• 2.5V to 1.8V voltage translation
• PCI bus isolation hot swap
The QS3V245 is characterized for operation from -40°C to +85°C.
FUNCTIONALBLOCKDIAGRAM
2
3
4
5
6
7
8
9
A0
A1
A2
A3
A4
A5
A6
A7
19
OE
B0
18
B1
17
B2
16
B3
15
B4
14
B5
13
B6
12
B7
11
TheIDTlogoisaregisteredtrademarkofIntegratedDeviceTechnology,Inc.
NOVEMBER 2000
INDUSTRIAL TEMPERATURE RANGE
1
c
2000 Integrated Device Technology, Inc.
DSC-5512/1
IDTQS3V245
INDUSTRIALTEMPERATURERANGE
3.3VHIGHSPEEDBUSSWITCH
ABSOLUTEMAXIMUMRATINGS(1)
PINCONFIGURATION
Symbol
Description
Supply Voltage to Ground
DC Switch Voltage
Max
–0.5 to +4.6
–0.5 to +4.6
–0.5 to +4.6
–3
Unit
V
(2)
VTERM
VS
V
VIN
DC Input Voltage
V
20
19
18
17
16
15
14
13
12
11
NC
A0
1
2
3
4
5
6
7
8
9
10
VCC
OE
B0
B1
B2
B3
B4
B5
B6
B7
VAC
IOUT
AC Input Voltage (pulse width ≤20ns)
DC Output Current (max. sink current/pin)
Maximum Power Dissipation
Storage Temperature
V
120
mA
W
0.5
A1
TSTG
–65 to +150
°C
A2
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.
A3
A4
2. VCC terminals.
A5
A6
A7
CAPACITANCE (TA = +25°C, f = 1MHz, VIN = 0V, VOUT = 0V)
GND
Symbol
CIN
Parameter(1)
Typ.
Max. Unit
Control Inputs
4
5
6
7
pF
pF
CI/O
Quickswitch Channels (Switch OFF)
SOIC/ QSOP
TOP VIEW
NOTE:
1. As applicable to the device type.
PINDESCRIPTION
Pin Names
Description
OE
Ax
Bx
Output Enable
Data I/Os
Data I/Os
FUNCTIONTABLE(1)
OE
Outputs
Disconnected
Ax = Bx
H
L
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
2
IDTQS3V245
3.3VHIGHSPEEDBUSSWITCH
INDUSTRIALTEMPERATURERANGE
DCELECTRICALCHARACTERISTICSOVEROPERATINGRANGE
FollowingConditionsApplyUnlessOtherwiseSpecified:
Industrial: TA = –40°C to +85°C, VCC = 3.3V ±0.3V
Symbol
VIH
Parameter
Input HIGH Voltage
Test Conditions
GuaranteedLogicHIGHforControlInputs
GuaranteedLogicLOWforControlInputs
0V ≤ VIN ≤ VCC
Min.
2
Typ.(1) Max.
Unit
V
—
—
—
0.8
1
VIL
InputLOWVoltage
—
—
—
—
—
—
—
2.3
—
V
IIN
InputLeakageCurrent(ControlInputs)
Off-StateCurrent(Hi-Z)
—
µA
µA
IOZ
0V ≤ VOUT ≤ VCC, Switches OFF
VCC = Min., VIN = 0V, ION = 8mA
VCC = Min., VIN = 1.7V, ION = 8mA
VCC = 2.3V, VIN = 0V, ION = 8mA
VCC = 2.3V, VIN = 1.3V, ION = 8mA
VIN = VCC = 3.3V, IOUT = -5µA
VIN = VCC = 2.5V, IOUT = -5µA
0.001
5
1
7
RON
VP
Switch ON Resistance
PassVoltage(2)
15
20
—
—
2.9
—
Ω
7
25
2.7
1.8
V
NOTES:
1. Typical values are at VCC = 3.3V and TA = 25°C.
2. Pass voltage is guaranteed, but not production tested.
IN
CC
TYPICAL ON RESISTANCE vs V AT V = 3.3V
16
14
12
10
RON
(ohms)
8
6
4
2
0
2.5
0
0.5
1
1.5
2
VIN
(Volts)
3
IDTQS3V245
INDUSTRIALTEMPERATURERANGE
3.3VHIGHSPEEDBUSSWITCH
POWERSUPPLYCHARACTERISTICS
TA = –40°C to +85°C, VCC = 3.3V ±0.3V
Symbol
ICCQ
Parameter
TestConditions(1)
Min.
—
Max.
3
Unit
µA
Quiescent Power Supply Current
Power Supply Current (2) per Input HIGH
Dynamic Power Supply Current per MHz (3) VCC = 3.3V, A and B Pins Open, Control Input Toggling
VCC = Max., VIN = GND or VCC, f = 0
∆ICC
VCC = Max., VIN = 3V or VCC, f = 0 per Control Input
—
30
µA
ICCD
—
0.15
mA/MHz
@ 50% Duty Cycle
NOTES:
1. For conditions shown as Min. or Max., use the appropriate values specified under DC Electrical Characteristics.
2. Per TTL driven input (VIN = 3V, 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(1)
TA = -40°C to +85°C
Symbol
tPLH
Parameter
DataPropagationDelay(2,3)
Min.
Typ.
Max.
Unit
0.25
ns
tPHL
Ax to/from Bx
tPZL
SwitchTurn-OnDelay
OE to Ax/Bx
SwitchTurn-OffDelay(2)
0.5
0.5
6.5
4
ns
ns
tPZH
tPLZ
tPHZ
OE to Ax/Bx
NOTES:
1. See TEST CIRCUITS AND WAVEFORMS. Minimums 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 = 30pF. 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
IDTQS3V245
3.3VHIGHSPEEDBUSSWITCH
INDUSTRIALTEMPERATURERANGE
OUTPUTVICHARACTERISTICS
VOUT (Volts)
2
3
4
1
-50
250
-100
-150
-200
200
150
100
50
-250
-300
0
0
0.5
1
2
1.5
VOUT (Volts)
Outputs Low Characteristic
Outputs High Characteristic
CC
PASS VOLTAGE vs V
3
VOUT = 2.5V @ VCC = 3.3V
VOUT = 1.8V @ VCC = 2.5V
2.5
2
1.5
3
2.2
2.4
2.7
3.3
3.6
VCC (V)
5
IDTQS3V245
INDUSTRIALTEMPERATURERANGE
3.3VHIGHSPEEDBUSSWITCH
3.3VTO2.5VVOLTAGETRANSLATION
3.3V
VOUT
3.3V Supply
2.5V
3.3V
2.5V
2.5V
QS3V245
2.5V
VIN
0V
3.3V
Input of Switch
2.5VTO1.8VVOLTAGETRANSLATION
2.5V
VOUT
2.5V Supply
1.8V
2.5V
1.8V
QS3V245
1.8V
1.8V
VIN
0V
2.5V
Input of Switch
6
IDTQS3V245
3.3VHIGHSPEEDBUSSWITCH
INDUSTRIALTEMPERATURERANGE
ORDERINGINFORMATION
IDTQS
XXXXX
XX
Package
Device Type
Small Outline IC (Gull Wing)
Quarter Size Small Outline Package
SO
Q
3.3V High Speed Bus Switch
3V245
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
7
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