INDUSTRIAL TEMPERATURE RANGE
IDT74FCT2646AT/CT
FAST CMOS OCTAL TRANSCEIVER/REGISTER (3-STATE)
1
AUGUST 2000
INDUSTRIAL TEMPERATURE RANGE
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
2000 Integrated Device Technology, Inc.
DSC-5506/1
FEATURES:
A and C grades
Low input and output leakage
1A (max.)
CMOS power levels
True TTL input and output compatibility:
V
OH
= 3.3V (typ.)
V
OL
= 0.3V (typ.)
Resistor outputs (-15mA I
OH
, 12mA I
OL
)
Meets or exceeds JEDEC standard 18 specifications
Reduced system switching noise
Power off disable outputs permit "live insertion"
Available in SOIC, QSOP, and TSSOP packages
FUNCTIONAL BLOCK DIAGRAM
IDT74FCT2646AT/CT
FAST CMOS OCTAL
TRANSCEIVER/
REGISTER (3-STATE)
DESCRIPTION:
The FCT2646T 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 FCT2646T
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 flip-
flops by low-to-high transitions at the appropriate clock pins (CPAB or
CPBA), regardless of the select or enable control pins.
The FCT2646T have balanced drive outputs with current limiting
resistors. This offers low ground bounce, minimal undershoot and con-
trolled output fall times-reducing the need for external series terminating
resistors. FCT2646T parts are plug-in replacements for FCT646T parts.
A1
G
DIR
CPB A
SBA
CPA B
SAB
ONE OF EIGH T CHANNELS
B REG
A REG
B1
1D
C1
C1
1D
TO SEVE N OTHER CHANN ELS
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