IDTQS3245PA8 [IDT]
Bus Driver, 3245 Series, 1-Func, 8-Bit, True Output, CMOS, PDSO20, TSSOP-20;
| 型号： | IDTQS3245PA8 |
| 厂家： | 
INTEGRATED DEVICE TECHNOLOGY |
| 描述： | Bus Driver, 3245 Series, 1-Func, 8-Bit, True Output, CMOS, PDSO20, TSSOP-20 驱动 光电二极管 逻辑集成电路 |
| 文件： | 总5页 (文件大小：92K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
QUICKSWITCH® PRODUCTS
IDTQS3245
HIGH-SPEED CMOS
QUICKSWITCH
8-BIT BUS SWITCH
DESCRIPTION:
FEATURES:
−
−
−
−
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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 74F245, 74FCT245, and 74FCT245T
Low power CMOS proprietary technology
Zero propagation delay, zero ground bounce
Undershoot clamp diodes on all switch and control inputs
TTL-compatible control inputs
TheQS3245provides asetofeighthigh-speedCMOSTTL-compatible
bus switches ina pinoutcompatible with74FCT245,74F245,74ALS/AS/
LS245 8-bit transceivers. The low ON resistance of the QS3245 allows
inputs to be connected to outputs without adding propagation delay and
without generating additional ground bounce noise. The Output Enable
(OE)signalturns the switches onsimilartothe OE signalofthe 74’245.
QuickSwitchdevices provide anorderofmagnitude fasterspeedthan
conventionallogicdevices.
Available in TSSOP, SOIC, and QSOP Packages
The QS3245 is characterized for operation at -40°C to +85°C.
APPLICATIONS
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−
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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
FUNCTIONALBLOCKDIAGRAM
A0
A1
A2
A3
A4
A5
A6
A7
OE
0
1
2
3
4
5
6
7
B
B
B
B
B
B
B
B
INDUSTRIAL TEMPERATURE RANGE
APRIL 2000
1
c
1999 Integrated Device Technology, Inc.
DSC-5753/-
IDTQS3245
HIGH-SPEEDCMOSQUICKSWITCH8-BITBUSSWITCH
INDUSTRIALTEMPERATURERANGE
ABSOLUTE MAXIMUM RATINGS (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)
V
VTERM
1
2
20
19
18
17
16
15
14
13
12
11
VCC
OE
B0
NC
A0
(3)
DC Input Voltage VIN
V
VTERM
VAC
AC Input Voltage (pulse width ≤20ns)
V
IOUT
PMAX
TSTG
DC Output Current
120
mA
W
3
A1
A2
A3
Maximum Power Dissipation (TA = 85°C)
Storage Temperature
0.5
– 65 to +150 °C
B1
4
NOTES:
SO20-2
SO20-8
SO20-9
5
B
2
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.
6
B3
B4
B5
B6
A
4
7
A5
A6
8
3. All terminals except Vcc.
9
A7
10
GND
B
7
CAPACITANCE
(TA = +25OC, f = 1.0MHz, VIN = 0V, VOUT = 0V)
Pins
Typ.
Max. (1)
Unit
Control Pins
3
5
pF
SOIC/ QSOP/ TSSOP
TOP VIEW
Quickswitch Channels (Switch OFF)
5
7
pF
NOTE:
1. This parameter is guaranteed but not production tested.
PIN DESCRIPTION
Pin Names
Description
OE
Output Enable
Data I/Os
An
Bn
Data I/Os
FUNCTION TABLE(1)
OE
Outputs
Disconnected
An =Bn
H
L
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
2
IDTQS3245
HIGH-SPEEDCMOSQUICKSWITCH8-BITBUSSWITCH
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
—
—
—
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) (2)
Off-State Current (Hi-Z)
Switch ON Resistance
Switch ON Resistance
Pass Voltage (2)
—
IOZ
RON
RON
VP
0V ≤ VOUT ≤ Vcc, Switches OFF
Vcc = Min., VIN = 0V, ION = 30mA
Vcc = Min., VIN = 2.4V, ION = 15mA
VIN = Vcc = 5V, IOUT = -5µA
±0.001
5
10
15
4.2
Ω
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
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
IDTQS3245
HIGH-SPEEDCMOSQUICKSWITCH8-BITBUSSWITCH
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)
V
CC = Max., V = 3.4V, f = 0
1.5
mA
IN
ICCD
VCC = Max., A and B 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). 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 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
Industrial: TA = -40°C to +85°C, VCC = 5.0V ± 5%
Ω
CLOAD = 50pF, RLOAD = 500 unless otherwise noted.
Min. (1)
Typ.
—
Max.
Symbol
tPLH
Parameter
Data Propagation Delay (2,3)
An to/from Bn
Unit
—
0.25
ns
tPHL
tPZL
Switch Turn-on Delay
OE to An/Bn
Switch Turn-off Delay (2)
—
5.6
4.5
0.5
0.5
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 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
IDTQS3245
HIGH-SPEEDCMOSQUICKSWITCH8-BITBUSSWITCH
INDUSTRIALTEMPERATURERANGE
ORDERINGINFORMATION
XX
IDTQS
XXXXX
X
Package
Process
Device Type
Industrial (-40°C to +85°C)
Blank
SO
Q
PA
Small Outline IC (SO20-2)
Quarter Size Outline Package (SO20-8)
Thin Shrink Small Outline Package (SO20-9)
3245
High Speed CMOS Quickswitch 8-Bit Bus Switch
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The IDT logo, QuickSwitch, and SynchroSwitch are registered trademarks of Integrated Device Technology, Inc.
5
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