IDT74FCT2245ATSO8 [IDT]
Bus Transceiver, FCT Series, 1-Func, 8-Bit, True Output, CMOS, PDSO20, SOIC-20;![IDT74FCT2245ATSO8](http://pdffile.icpdf.com/pdf2/p00290/img/icpdf/IDT74FCT2245_1759313_icpdf.jpg)
型号: | IDT74FCT2245ATSO8 |
厂家: | ![]() |
描述: | Bus Transceiver, FCT Series, 1-Func, 8-Bit, True Output, CMOS, PDSO20, SOIC-20 光电二极管 逻辑集成电路 |
文件: | 总7页 (文件大小:66K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
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FAST CMOS OCTAL
IDT74FCT2245AT/CT
BIDIRECTIONAL
TRANSCEIVER
FEATURES:
DESCRIPTION:
• A and C grades
TheIDToctalbidirectionaltransceiversarebuiltusinganadvanceddual
• Low input and output leakage ≤1µA (max.)
metal CMOS technology. The FCT2245T is designed for asynchronous
two-waycommunicationbetweendatabuses. Thetransmit/receive(T/R)
input determines the direction of data flow through the bidirectional trans-
ceiver. Transmit (active high) enables data from A ports to B ports, and
receive (active low) from B ports to A ports. The output enable (OE) input,
whenhigh, disablesbothAandBportsbyplacingtheminhighZcondition.
TheFCT2245Thasbalanceddriveoutputswithcurrentlimitingresistors.
This offers low ground bounce, minimal undershoot and controlled output
falltimes- reducingtheneedfor externalseriesterminatingresistors. The
FCT2245T parts are plug-in replacements for FCT245T parts.
• CMOS power levels
• True TTL input and output compatibility:
– VOH = 3.3V (typ.)
– VOL = 0.3V (typ.)
• Meets or exceeds JEDEC standard 18 specifications
• Resistor outputs -15mA IOH, 12mA IOL
• Reduced system switching noise
• Available in SOIC, QSOP, and TSSOP packages
FUNCTIONALBLOCKDIAGRAM
T/R
OE
0
A
0
B
1
A
1
B
2
A
2
B
3
A
3
B
4
A
4
B
5
A
5
B
6
A
6
B
7
A
B7
TheIDTlogoisaregisteredtrademarkofIntegratedDeviceTechnology,Inc.
INDUSTRIAL TEMPERATURE RANGE
JUNE 2002
1
© 2002 Integrated Device Technology, Inc.
DSC-5511/2
IDT74FCT2245AT/CT
FASTCMOSOCTALBIDIRECTIONALTRANSCEIVER
INDUSTRIALTEMPERATURERANGE
ABSOLUTEMAXIMUMRATINGS(1)
PINCONFIGURATION
Symbol
Description
Max
Unit
V
(2)
VTERM
Terminal Voltage with Respect to GND
–0.5 to +7
(3)
VTERM
Terminal Voltage with Respect to GND –0.5 to VCC+0.5
V
VCC
20
19
18
17
16
15
14
13
12
11
1
2
T/R
A0
A1
A2
A3
TSTG
IOUT
Storage Temperature
DC Output Current
–65 to +150
–60 to +120
°C
mA
OE
B0
B1
B2
B3
NOTES:
3
4
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. No terminal voltage may exceed
Vcc by +0.5V unless otherwise noted.
5
2. Inputs and Vcc terminals only.
3. Output and I/O terminals only.
A4
A5
A6
A7
6
B4
B5
B6
B7
7
CAPACITANCE (TA = +25°C, F = 1.0MHz)
Symbol
8
Parameter(1)
Input Capacitance
Output Capacitance
Conditions
Typ.
Max. Unit
CIN
VIN = 0V
6
8
10
12
pF
pF
9
COUT
VOUT = 0V
GND
10
NOTE:
1. This parameter is measured at characterization but not tested.
SOIC/ QSOP/ TSSOP
TOP VIEW
PINDESCRIPTION
Pin Names
Description
Output Enable Input (Active LOW)
Transmit/Receive Input
OE
T/R
A0 - A7
B0 - B7
Side A Inputs or 3-State Outputs
Side BInputs or 3-State Outputs
FUNCTIONTABLE(1)
Inputs
OE
L
T/R
L
Outputs
Bus B Data to Bus A
Bus A Data to Bus B
HighZState
L
H
H
X
NOTE:
1. H = HIGH Voltage Level
X = Don’t Care
L = LOW Voltage Level
2
IDT74FCT2245AT/CT
INDUSTRIALTEMPERATURERANGE
FASTCMOSOCTALBIDIRECTIONALTRANSCEIVER
DCELECTRICALCHARACTERISTICSOVEROPERATINGRANGE
FollowingConditionsApplyUnlessOtherwiseSpecified:
Industrial: TA = –40°C to +85°C, VCC = 5.0V ±5%
Symbol
VIH
VIL
Parameter
Input HIGH Level
Test Conditions(1)
Guaranteed Logic HIGH Level
Min.
2
Typ.(2)
—
Max.
—
Unit
V
Input LOW Level
Guaranteed Logic LOW Level
VCC = Max.
—
—
—
—
—
—
—
—
—
—
0.8
±1
±1
±1
±1
±1
–1.2
—
V
IIH
Input HIGH Current(4)
Input LOW Current(4)
VI = 2.7V
VI = 0.5V
VI = 2.7V
VI = 0.5V
—
µA
µA
µA
IIL
VCC = Max.
—
IOZH
IOZL
II
High Impedance Output Current
(3-State Output Pins)(4)
Input HIGH Current(4)
Clamp Diode Voltage
Input Hysteresis
VCC = Max.
—
—
VCC = Max., VI = VCC (Max.)
VCC = Min., IIN = –18mA
—
µA
V
VIK
VH
–0.7
200
0.01
—
mV
mA
ICC
Quiescent Power Supply Current
VCC = Max.
1
VIN = GND or VCC
OUTPUTDRIVECHARACTERISTICS
Symbol
Parameter
OutputLOWCurrent
Output HIGH Current
Output HIGH Voltage
Test Conditions(1)
Min.
16
-16
2.4
Typ.(2)
48
-48
3.3
Max.
—
—
Unit
mA
mA
V
IODL
IODH
VOH
VCC = 5V, VIN = VIH or VIL, VOUT = 1.5V(3)
VCC = 5V, VIN = VIH or VIL, VOUT = 1.5V(3)
VCC = Min
IOH = –15mA
IOL = 12mA
—
VIN = VIH or VIL
VCC = Min
VOL
Output LOWVoltage
—
0.3
0.5
V
VIN = VIH or VIL
NOTES:
1. For conditions shown as Min. or Max., use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at VCC = 5.0V, +25°C ambient.
3. Not more than one output should be tested at one time. Duration of the test should not exceed one second.
4. The test limit for this parameter is ±5µA at TA = -55°C.
3
IDT74FCT2245AT/CT
FASTCMOSOCTALBIDIRECTIONALTRANSCEIVER
INDUSTRIALTEMPERATURERANGE
POWERSUPPLYCHARACTERISTICS
Symbol
Parameter
Test Conditions(1)
Min.
Typ.(2)
Max.
Unit
∆ICC
Quiescent Power Supply Current
TTL Inputs HIGH
VCC = Max.
VIN = 3.4V(3)
—
0.5
2
mA
ICCD
Dynamic Power Supply
Current(4)
VCC = Max.
Outputs Open
OE = T/R = GND
VIN = VCC
VIN = GND
—
0.06
0.12
mA/
MHz
One Input Toggling
50% Duty Cycle
IC
Total Power Supply Current(6)
VCC = Max.
Outputs Open
fi = 10MHz
VIN = VCC
VIN = GND
—
—
—
—
0.6
0.9
1.2
3.2
2.2
3.2
mA
50% Duty Cycle
OE = T/R = GND
One BitToggling
VIN = 3.4V
VIN = GND
VCC = Max.
Outputs Open
fi = 2.5MHz
VIN = VCC
VIN = GND
3.4(5)
11.4(5)
50% Duty Cycle
OE = T/R = GND
Eight Bits Toggling
VIN = 3.4V
VIN = GND
NOTES:
1. For conditions shown as Min. or Max., use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at VCC = 5.0V, +25°C ambient.
3. Per TTL driven input; (VIN = 3.4V). All other inputs at VCC or GND.
4. This parameter is not directly testable, but is derived for use in Total Power Supply Calculations.
5. Values for these conditions are examples of ∆ICC formula. These limits are guaranteed but not tested.
6. IC = IQUIESCENT + IINPUTS + IDYNAMIC
IC = ICC + ∆ICC DHNT + ICCD (fCP/2+ fiNi)
ICC = Quiescent Current
∆ICC = Power Supply Current for a TTL High Input (VIN = 3.4V)
DH = Duty Cycle for TTL Inputs High
NT = Number of TTL Inputs at DH
ICCD = Dynamic Current caused by an Input Transition Pair (HLH or LHL)
fCP = Clock Frequency for Register Devices (Zero for Non-Register Devices)
fi = Output Frequency
Ni = Number of Outputs at fi
All currents are in milliamps and all frequencies are in megahertz.
4
IDT74FCT2245AT/CT
INDUSTRIALTEMPERATURERANGE
FASTCMOSOCTALBIDIRECTIONALTRANSCEIVER
SWITCHINGCHARACTERISTICSOVEROPERATINGRANGE(1)
74FCT2245AT
74FCT2245CT
(2)
(2)
Symbol
tPLH
Parameter
Condition(1)
CL = 50 pF
RL = 500Ω
Min.
Max.
Min.
Max.
Unit
PropagationDelay
A to B, B to A
1.5
4.6
1.5
4.1
5.8
4.8
5.8
4.8
ns
tPHL
tPZH
tPZL
OutputEnableTime
OE to A or B
1.5
1.5
1.5
1.5
6.2
5
1.5
1.5
1.5
1.5
ns
ns
ns
ns
tPHZ
tPLZ
OutputDisableTime
OE to A or B
tPZH
tPZL
OutputEnableTime
T/R to A or B(3)
OutputDisableTime
T/R to A or B(3)
6.2
5
tPHZ
tPLZ
NOTES:
1. See test circuit and waveforms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
3. This parameter is guaranteed but not tested.
5
IDT74FCT2245AT/CT
FASTCMOSOCTALBIDIRECTIONALTRANSCEIVER
INDUSTRIALTEMPERATURERANGE
TESTCIRCUITSANDWAVEFORMS
VCC
SWITCHPOSITION
7.0V
Test
Switch
Closed
Open
500Ω
Open Drain
Disable Low
Enable Low
VOUT
VIN
Pulse
Generator
D.U.T
.
All Other Tests
50pF
500Ω
T
R
DEFINITIONS:
CL = Load capacitance: includes jig and probe capacitance.
L
C
RT = Termination resistance: should be equal to ZOUT of the Pulse Generator.
Octal link
Test Circuits for All Outputs
3V
DATA
1.5V
0V
INPUT
LOW-HIGH-LOW
tH
tSU
1.5V
PULSE
3V
1.5V
0V
TIMING
INPUT
ASYNCHRONOUS CONTROL
tW
tREM
PRESET
CLEAR
ETC.
3V
1.5V
0V
HIGH-LOW-HIGH
PULSE
1.5V
SYNCHRONOUS CONTROL
PRESET
3V
Octal link
1.5V
0V
CLEAR
tSU
tH
CLOCK ENABLE
ETC.
Pulse Width
Octal link
Set-Up, Hold, and Release Times
ENABLE
DISABLE
3V
1.5V
0V
3V
SAME PHASE
CONTROL
INPUT
1.5V
0V
INPUT TRANSITION
tPLH
tPLH
tPHL
tPHL
tPZL
tPLZ
VOH
1.5V
VOL
OUTPUT
3.5V
1.5V
3.5V
VOL
VOH
OUTPUT
NORMALLY
LOW
SWITCH
CLOSED
0.3V
0.3V
3V
1.5V
0V
tPZH
tPHZ
OPPOSITE PHASE
INPUT TRANSITION
OUTPUT
NORMALLY
HIGH
SWITCH
OPEN
1.5V
0V
Octal link
0V
Octal link
Propagation Delay
Enable and Disable Times
NOTES:
1. Diagram shown for input Control Enable-LOW and input Control Disable-HIGH.
2. Pulse Generator for All Pulses: Rate ≤ 1.0MHz; tF ≤ 2.5ns; tR ≤ 2.5ns.
6
IDT74FCT2245AT/CT
INDUSTRIALTEMPERATURERANGE
FASTCMOSOCTALBIDIRECTIONALTRANSCEIVER
ORDERINGINFORMATION
XXXX
XX
IDT
XX
FCT
Package
Device Type
Temp. Range
SO
Q
PG
Small Outline IC
Quarter-size Small Outline Package
Thin Shrink Small Outline Package
Octal Bidirectional Transceiver
2245AT
2245CT
74
– 40°C to +85°C
DATASHEETDOCUMENTHISTORY
6/24/2002 Updated as per PDNs Logic-00-07 and Logic-01-04
CORPORATE HEADQUARTERS
2975StenderWay
Santa Clara, CA 95054
for SALES:
800-345-7015 or 408-727-6116
fax: 408-492-8674
for Tech Support:
logichelp@idt.com
(408) 654-6459
www.idt.com
7
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Bus Transceiver, FCT Series, 1-Func, 8-Bit, True Output, CMOS, PDSO20, GREEN, SOIC-20
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