PI74ALVCHR162524A 查看數據表（PDF） - Pericom Semiconductor

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PI74ALVCHR162524A

18-Bit Registered Bus Transceiver with 3-State Outputs

Pericom Semiconductor 

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18-Bit Registered Bus Transceiver

with 3-State Outputs

Product Features

• PI74ALVCHR162524 is designed for low voltage operation

• VCC = 2.3V to 3.6V

• A & B parts have equivalent 26 Ohm series resistors

• 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 using the Company’s advanced 0.5 micron CMOS

technology, achieving industry leading speed.

The PI74ALVCHR162524 data flow in each direction is controlled by

output-enable (OEAB and OEBA) and clock-enable (CLKENBA)

inputs. For the A-to-B data flow, the data flows through a single

buffer. The B-to-A data can flow through a four-stage pipeline

register path, or through a single register path, depending on the

state of the select (SEL) input.

Data is stored in the internal registers on the low-to-high

transition of the clock (CLK) input, provided that the appropriate

CLKENBA input is low. The B-to-A data transfer is synchronized

with CLK.

To reduce overshoot and undershoot, the A and B-port outputs

include 26-ohm series resistors.

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.

The PI74ALVCHR162524 has “Bus Hold” which retains the data

input’s last state whenever the data input goes to high-impedance

preventing “floating” inputs and eliminating the need for pullup/

down resistors.

Logic Block Diagram

CLK 30

CLKENBA 28

OEAB 2

OEBA 27

SEL 55

1 of 18 Channels

A1 3

CE

G1

C1

1

1D

1

CE

C1

1D

CE

C1

1D

CE

C1

1D

54 B1

To 17 Other Channels

1

PS8314B 11/06/00

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