PI74FCT646T Datasheet, PDF (1/7 Pages) Pericom Semiconductor Corporation – Fast CMOS Octal Registered Transceivers

PI74FCT646/648/651/652T
(25Ω Series) P174FCT2646T/2652T
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(25Ω Series PI74FCT2646T/2652T
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Fast CMOS Octal Registered Transceivers
Product Features:
• PI74FCT646T/648T/651T/652T/2646T/2652Tispincompatible
with bipolar FAST™ Series at a higher speed and lower power
consumption
• 25Ω series resistor on all outputs (FCT2XXX only)
• TTL input and output levels
• Low ground bounce outputs
• Extremely low static power
• Hysteresis on all inputs
• Industrial operating temperature range: –40°C to +85°C
• Packages available:
– 24-pin 300 mil wide plastic DIP (P)
– 24-pin 150 mil wide plastic QSOP (Q)
– 24-pin 150 mil wide plastic TQSOP (R)
– 24-pin 300 mil wide plastic SOIC (S)
• Device models available upon request
Logic Block Diagram
Product Description:
Pericom Semiconductor’s PI74FCT series of logic circuits are
produced in the Company’s advanced 0.6/0.8 micron CMOS
technology, achieving industry leading speed grades. All
PI74FCT2XXX devices have a built-in 25-ohm series resistor on
all outputs to reduce noise because of reflections, thus eliminating
the need for an external terminating resistor.
The PI74FCT646T/648T/651T/652T and PI74FCT2646T/2652T
are designed with 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
PI74FCT651/652T/2652T utilize GAB and GBA signals to control
the transceiver functions. The PI74FCT646/2646T/648T utilize
the enable control (G) and direction pins (DIR) to control the
transceiver functions. SAB and SBA control pins are used 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 real-time and stored data.
A low input level selects real-time data and a high selects stored
data.
The PI74FCT646T is a non-inverting option of the PI74FCT648T.
The PI74FCT652T is a non-inverting option of the PI74FCT651T.
PI74FCT646/648
ONLY
G
PI74FCT651/652 ONLY
GBA
GAB
DIR
CPBA
SBA
CPAB
SAB
1 OR 8 CHANNELS
A REG
A0
0D
C0
B REG
0D
C0
PI74FCT651/652 ONLY
B0
646/652
ONLY
646/652
ONLY
TO 7 OTHER CHANNELS
1
PS2022A 03/11/96