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(25鈩?Series PI74FCT2646T/2652T
Fast CMOS Octal Registered Transceivers
Product Features
Product Description
Pericom Semiconductor聮s PI74FCT series of logic circuits are
produced using the Company聮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 use 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.
聲 PI74FCT646T/648T/651T/652T/2646T/2652T is pin compatible
with bipolar FAST聶 Series at a higher speed and lower power
consumption
聲 25鈩?series resistor on all outputs (FCT2XXX only)
聲 TTL input and output levels
聲 Low ground bounce outputs
聲 Extremely low static power
聲 Hysteresis on all inputs
聲 Industrial operating temperature range: 聳40擄C to +85擄C
聲 Packages available:
聳 24-pin 300 mil wide plastic DIP (P)
聳 24-pin 150 mil wide plastic QSOP (Q)
聳 24-pin 150 mil wide plastic TQSOP (R)
聳 24-pin 300 mil wide plastic SOIC (S)
聲 Device models available upon request
Logic Block Diagram
PI74FCT651/652 ONLY
GBA
PI74FCT646/648
ONLY
G
GAB
DIR
CPBA
SBA
CPAB
SAB
1 OR 8 CHANNELS
B REG
0D
C
0
B
0
A REG
A
0
0D
C
0
PI74FCT651/652 ONLY
646/652
ONLY
646/652
ONLY
TO 7 OTHER CHANNELS
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