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PI74ALVCHT16245

3.3V 16-Bit Bidirectional Transceiver with 3-State Output

Pericom Semiconductor 

PI74ALVCHT16245

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3.3V 16-Bit Bidirectional Transceiver

with 3-State Output

Product Features

• PI74ALVCHT16245 is designed for low voltage operation

• VCC=2.3Vto3.6V

• 5V I/O Tolerant

• 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 pull-up resistors

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

• Packages available:

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

– 48-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 grades.

The PI74ALVCHT16245 is a 16-bit bidirectional transceiver designed

for asynchronous two-way communication between data buses.

The direction control input pin (xDIR) determines the direction of

data flow through the bidirectional transceiver. The Direction and

Output Enable controls are designed to operate this device as either

two independent 8-bit transceivers or one 16-bit transceiver. The

output enable (OE) input, when HIGH, disables both A and B ports

by placing them in HIGH Z condition.

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

ability of the driver.

The PI74ALVCHT16245 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

The PI74ALVCHT16245 can be driven from either 3.3V or 5.0Vdevices

allowing this device to be used as a translator in a mixed 3.3/5.0V

system.

1DIR

1A0

1A1

1A2

1A3

1A4

1A5

1A6

1A7

1OE

1B0

1B1

1B2

1B3

1B4

1B5

1B6

1B7

2DIR

2A0

2A1

2A2

2A3

2A4

2A5

2A6

2A7

2OE

2B0

2B1

2B2

2B3

2B4

2B5

2B6

2B7

1

PS8308 07/30/98

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