IDT74FCT645AL [IDT]
FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS; 快速CMOS八路双向收发器
| 型号： | IDT74FCT645AL |
| 厂家： | 
INTEGRATED DEVICE TECHNOLOGY |
| 描述： | FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS |
| 文件： | 总7页 (文件大小：74K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
IDT54/74FCT245/A/C
IDT54/74FCT640/A/C
IDT54/74FCT645/A/C
FAST CMOS OCTAL
BIDIRECTIONAL
TRANSCEIVERS
Integrated Device Technology, Inc.
FEATURES:
• IDT54/74FCT245/640/645 equivalent to FAST speed
and drive
DESCRIPTION:
The IDT octal bidirectional transceivers are built using an
advanced dual metal CMOS technology. The IDT54/
74FCT245/A/C,IDT54/74FCT640/A/CandIDT54/74FCT645/
A/C are designed for asynchronous two-way communication
between data buses. The transmit/receive (T/R) input deter-
mines the direction of data flow through the bidirectional
transceiver. 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, when HIGH, disables
both A and B ports by placing them in High-Z condition.
The IDT54/74FCT245/A/C and IDT54/74FCT645/A/C
transceivers have non-inverting outputs. The IDT54/
74FCT640/A/C has inverting outputs.
• IDT54/74FCT245A/640A/645A 25% faster than FAST
• IDT54/74FCT245C/640C/645C 40% faster than FAST
• TTL input and output level compatible
• CMOS output level compatible
• IOL = 64mA (commercial) and 48mA (military)
• Input current levels only 5µA max.
• CMOS power levels (2.5mW typical static)
• Direction control and over-riding 3-state control
• Product available in Radiation Tolerant and Radiation
Enhanced versions
• Military product compliant to MIL-STD-883, Class B and
DESC listed
• Meets or exceeds JEDEC Standard 18 specifications
FUNCTIONAL BLOCK DIAGRAM
PIN CONFIGURATIONS
1
2
20
19
18
17
16
15
T/R
T/R
A0
A1
A2
A3
A4
A5
A6
A7
Vcc
OE
B0
B1
B2
B3
B4
B5
B6
B7
3
OE
P20-1
D20-1
SO20-2
&
4
A
A
A
A
A
A
A
A
0
1
2
3
4
5
6
7
5
6
B
B
B
B
B
B
B
0
1
2
3
4
5
6
7
E20-1 14
13
12
11
8
9
10
GND
DIP/SOIC/CERPACK
TOP VIEW
INDEX
3
2
20 19
18
A2
A3
A4
A5
A6
4
5
6
7
8
B0
B1
B2
B3
B4
1
17
16
15
14
L20-2
10 11 12 13
9
B7
2534 drw 01
LCC
TOP VIEW
2534 drw 02
NOTES:
1. FCT245, 645 are noninverting options.
2. FCT640 is the inverting option.
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
FAST is a registered trademark of National Semiconductor Co.
MILITARY AND COMMERCIAL TEMPERATURE RANGES
MAY 1992
1992 Integrated Device Technology, Inc.
7.9
DSC-4201/3
1
IDT54/74FCT245/A/C, IDT54/74FCT640/A/C, IDT54/74FCT645/A/C
FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS
MILITARY AND COMMERCIAL TEMPERATURE RANGES
PIN DESCRIPTION
FUNCTION TABLE(2)
Pin Names
Description
Output Enable Input (Active LOW)
Transmit/Receive Input
Inputs
OE
T/
Outputs
Bus B Data to Bus A(1)
Bus A Data to Bus B(1)
High Z State
OE
L
R
T/R
L
A0–A7
B0–B7
Side A Inputs or 3-State Outputs
Side B Inputs or 3-State Outputs
L
H
X
H
2534 tbl 05
NOTES:
2534 tbl 06
1. 640 is inverting from input to output.
2. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
ABSOLUTE MAXIMUM RATINGS(1)
CAPACITANCE (TA = +25°C, f = 1.0MHz)
Symbol
Parameter(1)
Input Capacitance
I/O Capacitance
Conditions Typ. Max. Unit
Symbol
Rating
Commercial
Military
Unit
(2)
VTERM
Terminal Voltage
with Respect
to GND
–0.5 to +7.0 –0.5 to +7.0
V
CIN
VIN = 0V
6
8
10
12
pF
pF
CI/O
VOUT = 0V
(3)
NOTE:
2534 tbl 02
VTERM
Terminal Voltage
with Respect
to GND
–0.5 to VCC
0 to +70
–0.5 to VCC
V
1. This parameter is measured at characterization but not tested.
TA
Operating
–55 to +125 °C
Temperature
TBIAS
TSTG
Temperature
Under Bias
–55 to +125 –65 to +135 °C
–55 to +125 –65 to +150 °C
Storage
Temperature
PT
Power Dissipation
DC Output Current
0.5
0.5
W
IOUT
120
120
mA
NOTES:
2534 tbl 01
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.
2. Inputs and VCC terminals.
3. Outputs and I/O terminals.
7.9
2
IDT54/74FCT245/A/C, IDT54/74FCT640/A/C, IDT54/74FCT645/A/C
FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS
MILITARY AND COMMERCIAL TEMPERATURE RANGES
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified: VLC = 0.2V; VHC = VCC – 0.2V
Commercial: TA = 0°C to +70°C, VCC = 5.0V ± 5%; Military: TA = –55°C to +125°C, VCC = 5.0V ± 10%
Symbol
VIH
Parameter
Test Conditions(1)
Min.
Typ.(2)
Max.
Unit
V
Input HIGH Level
Guaranteed Logic HIGH Level
2.0
—
—
VIL
Input LOW Level
Input HIGH Current
(Except I/O pins)
Input LOW Current
(Except I/O pins)
Input HIGH Current
(I/O pins only)
Guaranteed Logic LOW Level
VCC = Max
—
—
—
—
—
—
—
—
—
—
—
—
0.8
5
5(4)
V
IIH
VI = VCC
VI = 2.7V
VI = 0.5V
VI = GND
VI = VCC
VI = 2.7V
VI = 0.5V
VI = GND
µA
—
IIL
IIH
IIL
—
–5(4)
—
–5
VCC = Max
—
15
µA
—
15(4)
–15(4)
–15
–1.2
Input LOW Current
(I/O pins only)
—
—
VIK
IOS
Clamp Diode Voltage
VCC = Min., IN = –18mA
VCC = Max.(3), VO = GND
–0.7
V
mA
V
Short Circuit Current
Output HIGH Voltage
–60
VHC
VHC
2.4
2.4
—
–120
VCC
VCC
4.3
—
—
VOH
VCC = 3V, VIN = VLC or VHC, IOH = –32µA
VCC = Min.
IOH = –300µA
—
VIN = VIH or VIL
IOH = –12mA MIL.
—
IOH = –15mA COM’L.
4.3
—
VOL
Output LOW Voltage
(Port A and Port B)
VCC = 3V, VIN = VLC or VHC, IOL = 300µA
GND
GND
0.3
VLC
V
(4)
VCC = Min.
IOL = 300µA
—
VLC
VIN = VIH or VIL
IOL = 48mA MIL.
IOL = 64mA COM’L.
—
0.55
0.55
—
0.3
NOTES:
2534 tbl 03
1. For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at VCC = 5.0V, +25°C ambient and maximum loading.
3. Not more than one output should be shorted at one time. Duration of the short circuit test should not exceed one second.
4. This parameter is guaranteed but not tested.
7.9
3
IDT54/74FCT245/A/C, IDT54/74FCT640/A/C, IDT54/74FCT645/A/C
FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS
MILITARY AND COMMERCIAL TEMPERATURE RANGES
POWER SUPPLY CHARACTERISTICS
VLC = 0.2V; VHC = VCC – 0.2V
Symbol
Parameter
Test Conditions(1)
Vcc = Max.
Min.
Typ.(2)
Max.
Unit
ICC
Quiescent Power Supply Current
—
0.5
1.5
mA
VIN ≥ VHC; VIN ≤ VLC
Vcc = Max.
∆ICC
Quiescent Power Supply Current
TTL Inputs HIGH
Dynamic Power Supply Current(4)
—
—
0.5
2.0
mA
VIN = 3.4V(3)
ICCD
Vcc = Max.
Outputs Open
VIN ≥ VHC
VIN ≤ VLC
0.15
0.25
mA/MHz
OE = GND
T/R = GND or VCC
One Input Toggling
50% Duty Cycle
IC
Total Power Supply Current(6)
Vcc = Max.
Outputs Open
fi = 10MHz
VIN ≥ VHC
VIN ≤ VLC
(FCT)
—
2.0
4.0
mA
50% Duty Cycle
T/R = OE = GND
One Bit Toggling
VIN = 3.4V
VIN = GND
—
—
—
2.3
3.5
5.5
5.0
Vcc = Max.
Outputs Open
fi = 2.5MHz
VIN ≥ VHC
VIN ≤ VLC
(FCT)
6.5(5)
14.5(5)
50% Duty Cycle
T/R = OE = GND
Eight Bits Toggling
VIN = 3.4V
VIN = GND
NOTES:
2534 tbl 04
1. For conditions shown as Max. or Min., 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 the 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 Output Transition Pair (HLH or LHL)
fCP = Clock Frequency for Register Devices (Zero for Non-Register Devices)
fi = Input Frequency
Ni = Number of Inputs at fi
All currents are in milliamps and all frequencies are in megahertz.
7.9
4
IDT54/74FCT245/A/C, IDT54/74FCT640/A/C, IDT54/74FCT645/A/C
FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS
MILITARY AND COMMERCIAL TEMPERATURE RANGES
SWITCHING CHARACTERISTICS OVER OPERATING RANGE FOR FCT245/A/C
54/74FCT245
54/74FCT245A
54/74FCT245C
Com’l. Mil.
Com’l. Mil.
Com’l. Mil.
(2)
(2)
Max. Min.
(2)
Max. Min.
(2)
Max. Min.
(2)
Max. Min.
(2)
Symbol
Parameter
Condition(1) Min.
Max. Min.
Max. Unit
tPLH
tPHL
Propagation Delay
A to B, B to A
CL = 50 pF 1.5
RL = 500Ω
7.0
9.5
7.5
9.5
7.5
1.5
7.5 1.5
4.6
6.2
5.0
6.2
5.0
1.5
4.9
6.5
6.0
6.5
6.0
1.5
4.1 1.5
5.8 1.5
4.8 1.5
5.8 1.5
4.8 1.5
4.5
6.2
5.2
6.2
5.2
ns
ns
ns
ns
tPZH
tPZL
Output Enable Time
OE to A or B
1.5
1.5
1.5
1.5
1.5 10.0 1.5
1.5 10.0 1.5
1.5 10.0 1.5
1.5 10.0 1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
tPHZ
tPLZ
Output Disable Time
OE to A or B
tPZH
tPZL
Output EnableTime
T/R to A or B(3)
tPHZ
tPLZ
Output Disable Time
T/R to A or B(3)
ns
2534 tbl 07
SWITCHING CHARACTERISTICS OVER OPERATING RANGE FOR FCT640/A/C
54/74FCT640
54/74FCT640A
54/74FCT640C
Com’l. Mil.
Com’l. Mil.
Com’l. Mil.
(2)
(2)
Max. Min.
(2)
Max. Min.
(2)
Max. Min.
(2)
Max. Min.
(2)
Symbol
Parameter
Condition(1) Min.
Max. Min.
Max. Unit
tPLH
tPHL
Propagation Delay
A to B, B to A
CL = 50 pF 2.0
RL = 500Ω
7.0 2.0
8.0 1.5
5.0
6.2
5.0
6.2
5.0
1.5
5.3
6.5
6.0
6.5
6.0
1.5
4.4 1.5
5.8 1.5
4.8 1.5
5.8 1.5
4.8 1.5
4.7
6.2
5.2
6.2
5.2
ns
ns
ns
ns
tPZH
tPZL
Output Enable Time
OE to A or B
2.0 13.0 2.0 16.0 1.5
2.0 10.0 2.0 12.0 1.5
2.0 13.0 2.0 16.0 1.5
2.0 10.0 2.0 12.0 1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
tPHZ
tPLZ
Output Disable Time
OE to A or B
tPZH
tPZL
Output Enable Time
T/R to A or B(3)
tPHZ
tPLZ
Output Disable Time
T/R to A or B(3)
ns
2534 tbl 08
SWITCHING CHARACTERISTICS OVER OPERATING RANGE FOR FCT645/A/C
54/74FCT645
54/74FCT645A
54/74FCT645C
Com’l. Mil.
Com’l. Mil.
Com’l. Mil.
(2)
(2)
Max. Min.
(2)
Max. Min.
(2)
Max. Min.
(2)
Max. Min.
(2)
Symbol
Parameter
Condition(1) Min.
Max. Min.
Max. Unit
tPLH
tPHL
Propagation Delay
A to B, B to A
CL = 50 pF 1.5
RL = 500Ω
9.5 1.5 11.0 1.5
4.6
6.2
5.0
6.2
5.0
1.5
4.9
6.5
6.0
6.5
6.0
1.5
4.1 1.5
5.8 1.5
4.8 1.5
5.8 1.5
4.8 1.5
4.5
6.2
5.2
6.2
5.2
ns
ns
ns
tPZH
tPZL
Output Enable Time
OE to A or B
1.5 11.0 1.5 12.0 1.5
1.5 12.0 1.5 13.0 1.5
1.5 11.0 1.5 12.0 1.5
1.5 12.0 1.5 13.0 1.5
1.5
1.5
tPHZ
tPLZ
Output Disable Time
OE to A or B
1.5
1.5
1.5
1.5
1.5
1.5
tPZH
tPZL
Output Enable Time
T/R to A or B(3)
ns
ns
tPHZ
tPLZ
Output Disable Time
T/R to A or B(3)
NOTES:
2534 tbl 09
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.
7.9
5
IDT54/74FCT245/A/C, IDT54/74FCT640/A/C, IDT54/74FCT645/A/C
FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS
MILITARY AND COMMERCIAL TEMPERATURE RANGES
TEST CIRCUITS AND WAVEFORMS
TEST CIRCUITS FOR ALL OUTPUTS
SWITCH POSITION
Test
Switch
Closed
Open
VCC
7.0V
Open Drain
Disable Low
Enable Low
500Ω
VOUT
VIN
Pulse
Generator
D.U.T.
All Other Tests
50pF
CL
500Ω
DEFINITIONS:
CL = Load capacitance: includes jig and probe capacitance.
2534 tbl 08
R T
RT = Termination resistance: should be equal to ZOUT of the Pulse
Generator.
SET-UP, HOLD AND RELEASE TIMES
PULSE WIDTH
3V
1.5V
0V
DATA
INPUT
tSU
t H
LOW-HIGH-LOW
1.5V
3V
1.5V
0V
TIMING
INPUT
PULSE
t W
ASYNCHRONOUS CONTROL
t REM
PRESET
CLEAR
ETC.
3V
1.5V
0V
HIGH-LOW-HIGH
PULSE
1.5V
SYNCHRONOUS CONTROL
PRESET
CLEAR
CLOCK ENABLE
ETC.
3V
1.5V
0V
t H
tSU
PROPAGATION DELAY
ENABLE AND DISABLE TIMES
ENABLE
DISABLE
3V
3V
CONTROL
INPUT
1.5V
0V
SAME PHASE
INPUT TRANSITION
1.5V
0V
tPZL
tPLZ
tPHL
tPLH
3.5V
1.5V
3.5V
OUTPUT
NORMALLY
LOW
VOH
SWITCH
CLOSED
OUTPUT
1.5V
0.3V
0.3V
VOL
VOH
tPZH
tPHZ
VOL
tPLH
tPHL
OUTPUT
NORMALLY
HIGH
SWITCH
OPEN
3V
1.5V
0V
OPPOSITE PHASE
INPUT TRANSITION
1.5V
0V
0V
NOTES
2534 drw 04
1. Diagram shown for input Control Enable-LOW and input Control
Disable-HIGH.
2. Pulse Generator for All Pulses: Rate ≤ 1.0 MHz; ZO ≤ 50Ω; tF ≤ 2.5ns;
tR ≤ 2.5ns.
7.9
6
IDT54/74FCT245/A/C, IDT54/74FCT640/A/C, IDT54/74FCT645/A/C
FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVERS
MILITARY AND COMMERCIAL TEMPERATURE RANGES
ORDERING INFORMATION
IDT
XX
FCT
X
X
X
Temperature
Range
Device
Type
Package Process
Blank
B
Commercial
MIL-STD-883, Class B
P
Plastic DIP
D
CERDIP
SO
L
E
Small Outline IC
Leadless Chip Carrier
CERPACK
245
Non-Inverting Buffer Transceiver
640
Octal Inverting Buffer Transceiver
645
Non-Inverting Buffer Transceiver
245A
640A
645A
245C
640C
645C
Fast Non-Inverting Buffer Transceiver
Fast Octal Inverting Buffer Transceiver
Fast Non-Inverting Buffer Transceiver
Super Fast Non-Inverting Buffer Transceiver
Super Fast Octal Inverting Buffer Transceiver
Super Fast Non-Inverting Buffer Transceiver
54
74
–55
°C to +125°C
0
°
C to +70°C
2534 drw 03
7.9
7
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