鈩?/div>
QUAD 2-INPUT MULTIPLEXER
Product Features:
鈥?PI74FCT157/257/2157/2257T 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 (25鈩?series only)
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?16-pin 150 mil wide plastic QSOP (Q)
鈥?16-pin 300 mil wide plastic SOIC (S)
鈥?16-pin 150 mil wide plastic SOIC (W)
Product Description:
Pericom Semiconductor鈥檚 PI74FCT series of logic circuits are pro-
duced in the Company鈥檚 advanced 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 PI74FCT157T/257T and PI74FCT2157T/2257T are high-
speed quad 2-input multiplexers. The common select input can be
used to select four bits of data from two sources. The four buffered
outputs present the selected data in the true (non-inverting) form.
The PI74FCT157T/2157T has a common, active-LOW, Enable
input (E). When E is inactive, all four outputs are held LOW. The
PI74FCT157T/2157T can generate any four of the 16 different
funtions of two variables with one common variable. The
PI74FCT157T/2157T can be used as a function generator or to
move data from two different groups of registers to a common bus.
The PI74FCT257/2257T has a common Output Enable (OE) input.
When OE is HIGH, all outputs are switched to a high-impedance
state allowing the outputs to interface directly with bus-oriented
systems.
Logic Block Diagram
S
157
ONLY
E
3 OTHER MULTIPLEXERS
I
1
B-I
1
D
Z
B
-Z
D
I
0
B-I
0
D
I
1
A
Z
A
I
0
A
257
ONLY
OE
1
PS2010A 03/09/96
1
2
3
4
5
