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Part: IDT74FCT245
Category:
Logic
-> Bus Interface
-> Bus Oriented Circuits
Description: Fast CMOS Octal Bidirectional Transceiver
Company: Integrated Device Technology, Inc.
Datasheet: Download IDT74FCT245 datasheet File size : 843 kB
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Datasheet text preview:
IDT54/74FCT245/A/C FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVER
MILITARY AND COMMERCIAL TEMPERATURE RANGES
FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVER
IDT54/74FCT245/A/C
FEATURES:
- - - - - - - - - - - - IDT54/74FCT245 equivalent to FASTTM speed IDT54/74FCT245A 25% faster than FAST IDT54/74FCT245C 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 typ. 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
DESCRIPTION:
The IDT octal bidirectional transceivers are built using an advanced dual metal CMOS technology. The IDT54/74FCT245/A/C is designed for asynchronous two-way communication between data buses. The transmit/ receive (T/R) input determines 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 HighZ condition. The IDT54/74FCT245/A/C transceivers have non-inverting outputs.
FUNCTIONAL BLOCK DIAGRAM
T/R
1 19
OE A0
2 18 3
B0
A1
17 4 16
B1
A2
B2 A3
5 15
B3
6
A4
14
B4 A5
7 13 8 12
B5
A6
B6 A7
9
11
B7
MILITARY AND COMMERCIAL TEMPERATURE RANGES
1
c 1999 Integrated Device Technology, Inc.
JULY 1999
DSC-5421/-
IDT54/74FCT245/A/C FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVER
MILITARY AND COMMERCIAL TEMPERATURE RANGES
PIN CONFIGURATION
A1 A0
IN D E X
A0 A1 A2 A3 A4 A5 A6 A7 GND
2 3 4 5 6 7 8 9 10
P 2 0 -1 D 2 0 -1 S O 2 0 -2 E 2 0 -1
19 18 17 16 15 14 13 12 11
OE B0 B1 B2 B3 B4 B5 B6 A2 A3 A4 A5 A6
4 5 6 7 8 9 10 11 12 13 L 2 0 -2 3 2 1 20 19 18 17 16 15 14
OE
T /R
T /R
1
20
V CC
V CC
B0 B1 B2 B3 B4
A7
B7
B6
B7
DIP/ SOIC/ CERPACK TOP VIEW
ABSOLUTE MAXIMUM RATINGS(1)
Symbol VTERM(2) VTERM(3) TA TBIAS TSTG PT IOUT Rating Terminal Voltage with Respect to GND Terminal Voltage with Respect to GND Operating Temperature Temperature Under Bias Storage Temperature Power Dissipation DC Output Current Commercial 0.5 to +7 0.5 to VCC 0 to +70 55 to +125 55 to +125 0.5 120 Military 0.5 to +7 0.5 to VCC 55 to +125 65 to +135 65 to +150 0.5 120 Unit V V °C °C °C W mA
8-link
PIN DESCRIPTION
Pin Names OE T/R A0-A7 B0-B7 Description Output Enable Input (Active LOW) Transmit/Receive Input Side A Inputs or 3-State Outputs Side B Inputs or 3-State Outputs
FUNCTION TABLE (1)
Inputs OE L L H T/R L H X Outputs Bus B Data to Bus A Bus A Data to Bus B High Z State
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. No terminal voltage may exceed VCC by +.5V unless otherwise noted. 2. Input and VCC terminals only. 3. Outputs and I/O terminals only.
NOTE: 1. H = HIGH Voltage Level L = LOW Voltage Level X = Don't Care
CAPACITANCE (TA = +25OC, f = 1.0MHz)
Symbol CIN CI/O Parameter(1) Input Capacitance I/O Capacitance Conditions VIN = 0V VOUT = 0V Typ. 6 8 Max. 10 12 Unit pF pF
NOTE: 1. This parameter is measured at characterization but not tested.
2
GND
LCC TOP VIEW
B5
IDT54/74FCT245/A/C FAST CMOS OCTAL BIDIRECTIONAL TRANSCEIVER
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 VIL II H II L II H II L VIK IOS VOH Parameter Input HIGH Level Input LOW Level Input HIGH Current (Except I/O pins) Input LOW Current (Except I/O pins) Input HIGH Current (I/O pins only) Input LOW Current (I/O pins only) Clamp Diode Voltage Short Circuit Current Output HIGH Voltage VCC = Min., IN = 18mA VCC = Max.(3), VO = GND VCC = 3V, VIN = VLC or VHC, IOH = 32µ A VCC = Min. VIN = VIH or VIL VOL Output LOW Voltage (Port A and Port B) IOH = 300µ A IOH = 12mA MIL. IOH = 15mA COM'L. VCC = 3V, VIN = VLC or VHC, IOL = 300µ A VCC = Min. VIN = VIH or VIL IOL = 300µ A IOL = 48mA MIL. IOL = 64mA COM'L. VCC = Max. Test Conditions(1) Guaranteed Logic HIGH Level Guaranteed Logic LOW Level VCC = Max. VI = VCC VI = 2.7V VI = 0.5V VI = GND VI = VCC VI = 2.7V VI = 0.5V VI = GND Min. 2 -- -- -- -- -- -- -- -- -- -- 60 VHC VHC 2.4 2.4 -- -- -- -- Typ.(2) -- -- -- -- -- -- -- -- -- -- 0.7 120 VCC VCC 4.3 4.3 GND GND 0.3 0.3 Max. -- 0.8 5 5(4) 5(4) 5 15 15(4) 15(4) 15 1.2 -- -- -- -- -- VLC VLC(4) 0.55 0.55 V V mA V µA Unit V V µA
NOTES: 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.
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