鈩?/div>
OCTAL REGISTERED TRANSCEIVERS
Fast CMOS Octal Registered Transceivers
Product Features:
鈥?PI74FCT646T/648T/651T/652T/2646T/2652T is pin compatible
with bipolar FAST鈩?Series at a higher speed and lower power
consumption
鈥?25鈩?series resistor on all outputs (FCT2XXX only)
鈥?TTL input and output levels
鈥?Low ground bounce outputs
鈥?Extremely low static power
鈥?Hysteresis on all inputs
鈥?Industrial operating temperature range: 鈥?0擄C to +85擄C
鈥?Packages available:
鈥?24-pin 300 mil wide plastic DIP (P)
鈥?24-pin 150 mil wide plastic QSOP (Q)
鈥?24-pin 150 mil wide plastic TQSOP (R)
鈥?24-pin 300 mil wide plastic SOIC (S)
鈥?Device models available upon request
Product Description:
Pericom Semiconductor鈥檚 PI74FCT series of logic circuits are
produced in the Company鈥檚 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.
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
1
PS2022A 03/11/96
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2
3
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