Document
IDT54/74FCT623T/AT/CT FAST CMOS OCTAL BUS TRANSCEIVERS (3-STATE)
FAST CMOS OCTAL BUS TRANSCEIVERS (3-STATE)
Integrated Device Technology, Inc.
IDT54/74FCT623T/AT/CT
FEATURES:
• • • • Std., A and C speed grades Low input and output leakage ≤1µA (max.) CMOS power levels True TTL input and output compatibility – VOH = 3.3V (typ.) – VOL = 0.3V (typ.) High drive outputs (-15mA IOH, 64mA IOL) Power off disable outputs permit “live insertion” Meets or exceeds JEDEC standard 18 specifications Product available in Radiation Tolerant and Radiation Enhanced versions Military product compliant to MIL-STD-883, Class B and DESC listed (dual marked) Available in DIP, SOIC, CERPACK and LCC packages
DESCRIPTION
The FCT623T/AT/CT is a non-inverting octal transceiver with 3-state bus-driving outputs in both the send and receive directions. The B bus outputs are capable of sinking 64mA and sourcing up to 15mA, providing very good capacitive drive characteristics. These octal bus transceivers are designed for asynchronous two-way communication between data buses. The control function implementation allows for maximum flexibility in timing. One important feature of the FCT623T/AT/CT is the Power Down Disable capability. When the GAB and GBA inputs are conditioned to put the device in high-Z state, the I/O ports will maintain high impedance during power supply ramps and when VCC = 0V. This is a desirable feature in back-plane applications where it may be necessary to perform “live” insertion and removal of cards for on-line maintenance. It is also a benefit in systems with multiple redundancy where one or more redundant cards may be powered-off.
• • • • • •
FUNCTIONAL BLOCK DIAGRAM
GBA
GAB
A1
B1
A2 - A8
B2 - B8
7 other transceivers
2563 drw 01
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
MILITARY AND COMMERCIAL TEMPERATURE RANGES
©1996 Integrated Device Technology, Inc.
NOVEMBER 1995
DSC-2563/5
6.19 6.19
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IDT54/74FCT623T/AT/CT FAST CMOS OCTAL BUS TRANSCEIVERS (3-STATE)
MILITARY AND COMMERCIAL TEMPERATURE RANGES
PIN CONFIGURATIONS
GAB
1 GAB A1 A2 A3 A4 A5 A6 A7 A8 GND 2 3 4 5 6 7 8 9 10 P20-1 D20-1 SO20-2 & E20-1 19 18 17 16 15 14 13 12 11 GBA B1 B2 B3 B4 B5 B6 B7 B8
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A2
3 A3 A4 A5 A6 A7 4 5 6 7 8
A1
1
20
VCC
2
20 19 18 17 16 15 14
GBA
VCC
INDEX
B1 B2 B3 B4 B5
L20-2
9 10 11 12 13
GND
B8 B7
A8
B6
DIP/SOIC/CERPACK TOP VIEW
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LCC TOP VIEW
DEFINITION OF FUNCTIONAL TERMS
Pin Names GBA, GAB A1 - A8 B1 - B8 Description Enable Inputs A Bus Inputs or 3-State Outputs B Bus Inputs or 3-State Outputs
2563 tbl 01
ABSOLUTE MAXIMUM RATINGS(1)
Symbol Rating Commercial VTERM(2) Terminal Voltage –0.5 to +7.0 with Respect to GND VTERM(3) Terminal Voltage –0.5 to with Respect to VCC +0.5 GND TA Operating 0 to +70 Temperature TBIAS Temperature –55 to +125 Under Bias TSTG Storage –55 to +125 Temperature PT Power Dissipation 0.5 I OUT DC Output Current –60 to +120 Military –0.5 to +7.0 Unit V
–0.5 to VCC +0.5 –55 to +125 –65 to +135 –65 to +150 0.5 –60 to +120
V
FUNCTION TABLE(1)
°C °C °C
W mA
GBA
L H H L
Enable Inputs GAB L H L H Outputs B data to A bus A data to B bus Z B data to A bus A data to B bus
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NOTES: 1. H = HIGH Voltage Level 2. L = LOW Volage Level 3. Z = High-Impedance (OFF) state
2563 lnk 03 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 +0.5V unless otherwise noted. 2. Input and VCC terminals only. 3. Outputs and I/O terminals only.
CAPACITANCE (TA = +25°C, f = 1.0MHz)
Symbol Parameter(1) CIN Input Capacitance COUT Output Capacitance Conditions VIN = 0V VOUT = 0V Typ. 6 8 Max. Unit 10 pF 12
pF
2563 lnk 04 NOTE: 1. This parameter is measured at characterization but not tested.
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IDT54/74FCT623T/AT/CT FAST CMOS OCTAL BUS TRANSCEIVERS (3-STATE)
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified: Commercial: TA = 0°C to +70°C, V CC = 5.0V ± 5%; Military: TA = –55°C to +125°C, VCC = 5.0V ± 10%
Symbol VIH VIL II H II L II VIK IOS VOH Parameter Input HIGH Level Input LOW Level Input HIGH Input HIGH Current (5) Current (5) Input LOW Current (5) Clamp Diode Voltage Short Circuit Current Output HIGH Voltage (A and B Bus) Test Conditions(1) Guaranteed Logic HIGH Level Guaranteed Logic LOW Level VCC = Max., VI = 2.7V VCC = Max., VI = 0.5V VCC = Max., VI = VCC (Max.) VCC = Min., IN = –18mA VCC = Max.(3) , VO = GND IOH = –6mA MIL. IOH = –8mA COM'L. IOH = –12mA MIL. IOH = –15mA COM'L. VCC = Min. IOL = 32mA MIL. (4) VIN = VIH or VIL IOL = 48mA COM'L. VCC = Min. IOL = 48mA MIL. (4) VIN = VI.