PI74FCT16827T/162827/162H827T

20-BIT BUFFERS

1

PS2041A 03/11/96

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Logic Block Diagram

PI74FCT16827T

PI74FCT162827T

PI74FCT162H827T

Fast CMOS

20-Bit Buffers

Product Description:

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

duced in the Company’s advanced 0.6 micron CMOS technology,

achieving industry leading speed grades.

ThePI74FCT16827T,PI74FCT162827T,and PI74FCT162H827Tare

20-bit wide bus drivers designed to provide buffering and high-

performance bus interfacing for wide data/address paths or buses

with parity. Two pair of nanded output enable controls allow the

devices to be operated as two 10-bit buffers or as one 20-bit buffer.

Signal pins are arranged in a flow-through organization for ease of

layout and hysteresis is designed into all inputs to improve noise

margin.

The PI74FCT16827T output buffers are designed with a Power-Off

disable function allowing “live insertion” of boards when the

devices are used as backplane drives.

The PI74FCT162827T has ±24 mA balanced output drivers. It is

designed with current limiting resistors at its outputs to control the

output edge rate resulting in lower ground bounce and undershoot.

This eliminates the need for external terminating resistors for most

interface applications.

The PI74FCT162H827T has “Bus Hold” which retains the input's last

state whenever the input goes to high-impedance preventing

“floating” inputs and eliminating the need for pull-up/down resistors.

Product Features:

CommonFeatures:

• PI74FCT16827T,PI74FCT162827T,andPI74FCT2H827T

are high-speed,

low power devices with high current drive

• Hysteresis on all inputs

• Packages available:

– 56-pin 240 mil wide plastic TSSOP (A)

– 56-pin 300 mil wide plastic SSOP (V)

PI74FCT16827T Features:

• Power off disable outputs permit "live insertion"

PI74FCT162827T Features:

• Balanced output drivers: ±24 mA

• Reduced system switching noise

PI74FCT162H827T Features:

• Bus Hold retains last active bus state during 3-state

• Eliminates the need for external pull-up resistors

1

1

1

1

To 9 other channels

2

2

2

2

To 9 other channels