IDT54/74FCT623T/AT/CT
FAST CMOS OCTAL BUS TRANSCEIVERS (3-STATE)
IDT54/74FCT623T/AT/CT
FAST CMOS OCTAL
BUS TRANSCEIVERS
(3-STATE)
Integrated Device Technology, Inc.
DESCRIPTION
FEATURES:
The FCT623T/AT/CT is a non-inverting octal transceiver
with 3-state bus-driving outputs in both the send and receive
directions.TheBbusoutputsarecapableofsinking64mAand
sourcing up to 15mA, providing very good capacitive drive
characteristics.
• 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.)
These octal bus transceivers are designed for asynchro-
noustwo-waycommunicationbetweendatabuses.Thecontrol
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.
– 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
FUNCTIONAL BLOCK DIAGRAM
GBA
GAB
B1
A1
B2 - B8
A2 - A8
7 other transceivers
2563 drw 01
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
MILITARY AND COMMERCIAL TEMPERATURE RANGES
NOVEMBER 1995
1996 Integrated Device Technology, Inc.
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