PI74ALVCH16543A 查看數據表（PDF） - Pericom Semiconductor

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PI74ALVCH16543A

16-Bit Registered Transceiver with 3-State Outputs

Pericom Semiconductor 

PI74ALVCH16543

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16-Bit Registered Transceiver

with 3-State Outputs

Product Features

• PI74ALVCH16543 is designed for low voltage operation

• VCC = 2.3V to 3.6V

• Hysteresis on all inputs

• Typical VOLP (Output Ground Bounce)

< 0.8V at VCC = 3.3V, TA = 25°C

• Typical VOHV (Output VOH Undershoot)

< 2.0V at VCC = 3.3V, TA = 25°C

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

eliminating the need for external pullup resistors

• Industrial operation at –40°C to +85°C

• Packages available:

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

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

Product Description

Pericom Semiconductor’s PI74ALVCH series of logic circuits are

produced in the Company’s advanced 0.5 micron CMOS technology,

achieving industry leading speed.

The PI74ALVCH16543, a 16-bit registered transceiver designed

for 2.3V to 3.6V VCC operation, can be used as two 8-bit transceivers

or one 16-bit transceiver. Separate Latch Enable (LEAB or LEBA),

and Output Enable (OEAB and OEBA) inputs are provided for each

register to permit independent control in either direction of data

flow.

The A-to-B Enable (CEAB) input must be LOW to enter data from

A or to output data from B. If CEAB is LOW and LEAB is LOW,

the A-to-B latches are transparent; a subsequent low-to-high

transition of LEAB puts the A latches in the storage mode. With

CEAB and OEAB both LOW, the 3-State B outputs are active and

reflect the data present at the output of the A latches. Data flow from

B to A is similar but requires using CEBA, LEBA, and OEBA.

To ensure the high-impedance state during power up or power

down, OE should be tied to VCC through a pull-up resistor; the

minimum value of the resistor is determined by the current-sinking

capability of the driver.

Active bus-hold circuitry is provided to hold unused or floating

data inputs at a valid logic level.

Logic Block Diagram

1

PS8128A 11/06/00

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