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IDT54/74FCT623T/AT/CT
FAST CMOS OCTAL BUS TRANSCEIVERS (3-STATE)
6.19
Integrated Device Technology, Inc.
FAST CMOS OCTAL
BUS TRANSCEIVERS
(3-STATE)
IDT54/74FCT623T/AT/CT
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 asynchro-
nous 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
G
BA 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 V
CC
= 0V. This is a desirable feature in back-plane
applications where it may be necessary to perform “l(fā)ive”
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
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
1
MILITARY AND COMMERCIAL TEMPERATURE RANGES
NOVEMBER 1995
1996 Integrated Device Technology, Inc.
6.19
DSC-2563/5
FEATURES:
Std., A and C speed grades
Low input and output leakage
≤
1
μ
A (max.)
CMOS power levels
True TTL input and output compatibility
– V
OH
= 3.3V (typ.)
– V
OL
= 0.3V (typ.)
High drive outputs (-15mA I
OH
, 64mA I
OL
)
Power off disable outputs permit “l(fā)ive 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
GAB
A1
B1
A2 - A8
B2 - B8
7 other transceivers
GBA
2563 drw 01