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PS2010A 03/09/96

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PI74FCT157T/257T

(25

Ω

Ω

Ω

Ω

Ω Series)PI74FCT2157T/2257T

QUAD 2-INPUT MULTIPLEXER

Product Description:

Pericom Semiconductor’s PI74FCT series of logic circuits are pro-

duced in the Company’s 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

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PI74FCT157T/257T

(25

Ω

Ω

Ω

Ω

Ω Series)PI74FCT2157T/2257T

Fast CMOS

Quad 2-Input Multiplexer

Product Features:

• PI74FCT157/257/2157/2257T is pin compatible with bipolar

FAST™ Series at a higher speed and lower power

consumption

•25

Ω series resistor on all outputs (FCT2XXX only)

• TTL input and output levels

• Low ground bounce outputs (25

Ω series only)

• Extremely low static power

• Hysteresis on all inputs

• Industrial operating temperature range: –40°C to +85°C

• Packages available:

– 16-pin 150 mil wide plastic QSOP (Q)

– 16-pin 300 mil wide plastic SOIC (S)

– 16-pin 150 mil wide plastic SOIC (W)

157

ONLY

S

E

257

ONLY

OE

3 OTHER MULTIPLEXERS