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PI74FCT821T/823T/825T

(25

Ω

Ω

Ω

Ω

Ω Series) P174FCT2821T/2823T

BUS INTERFACE REGISTERS

PS2023A 03/11/96

Product Description:

Pericom Semiconductor’s PI74FCT series of logic circuits are

produced 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 PI74FCT821T/2821T is a 10-bit wide register designed with

ten D-type flip-flops with a buffered common clock and buffered

3-state outputs. The PI74FCT823/2823T is a 9-bit wide register

designed with Clock Enable and Clear. The PI74FCT825T is an

8-bit wide register with all PI74FCT823T controls plus multiple

enables. When output enable (OE) is LOW, the outputs are enabled.

When OE is HIGH, the outputs are in the high impedance state.

Input data meeting the setup and hold time requirements of the D

inputs is transferred to the Y outputs on the LOW-to-HIGH transition

of the clock input.

Logic Block Diagram

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Fast CMOS

Bus Interface Registers

Product Features:

• PI74FCT821T/823T/825T/2821T/2823T 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

• Extremely low static power

• Hysteresis on all inputs

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

• Packages available:

– 24-pin 300 mil wide plastic DIP (P)

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

– 24-pin 150 mil wide plastic TQSOP (R)

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

• Device models available upon request

PI74FCT821T/823T/825T

(25

Ω

Ω

Ω

Ω

Ω Series) PI74FCT2821T/2823T

D

Q

CLR

CP

CP

OE

Q

CL

EN

D

Q

CP

Q

CL

D

Q

CP

Q

CL

D

Q

CP

Q

CL

D

Q

CP

Q

CL

D

Q

CP

Q

CL

D

Q

CP

Q

CL

D

Q

CP

Q

CL

PI74FCT825 Only