IDT74FCT646AT/CT
FAST CMOS OCTAL TRANSCEIVER/REGISTER (3-STATE)
INDUSTRIAL TEMPERATURE RANGE
FAST CMOS OCTAL
TRANSCEIVER/
REGISTER (3-STATE)
IDT74FCT646AT/CT
FEATURES:
DESCRIPTION:
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The FCT646T consists of a bus transceiver with 3-state D-type flip-flops
and control circuitry arranged for multiplexed transmission of data directly
from the data bus or from the internal storage registers. The FCT646T
utilizes the enable control (G) and direction (DIR) pins to control the
transceiver functions.
SAB and SBA control pins are provided to select either real- time or stored
data transfer. The circuitry used for select control will eliminate the typical
decoding glitch that occurs in a multiplexer during the transition between
stored and real-time data. A low input level selects real-time data and a high
selects stored data.
Data on the A or B data bus, or both, can be stored in the internal D flipflops by low-to-high transitions at the appropriate clock pins (CPAB or
CPBA), regardless of the select or enable control pins.
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A and C 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)
Meets or exceeds JEDEC standard 18 specifications
Power off disable outputs permit "live insertion"
Available in SOIC, SSOP, and QSOP packages
FUNCTIONAL BLOCK DIAGRAM
G
DIR
CPBA
SBA
CPAB
SAB
B REG
ONE OF EIGH T CHANNELS
1D
C1
A1
A REG
B1
1D
C1
TO SEVEN OTHER CHANN ELS
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
FEBRUARY 2006
1
© 2006 Integrated Device Technology, Inc.
DSC-5505/6
