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DESCRIPTION/ORDERING INFORMATION (CONTINUED)

GQL OR ZQL PACKAGE

(TOP VIEW)

1

2

3

4

A

B

C

D

E

F

G

H

J

K

5

6

SN74LVCH16543A

16-BIT REGISTERED TRANSCEIVER

WITH 3-STATE OUTPUTS

SCAS317M – NOVEMBER 1993 – REVISED MARCH 2005

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 the CEBA, LEBA, and

OEBA inputs.

resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of this device as a translator in

a mixed 3.3-V/5-V system environment.

preventing damaging current backflow through the device when it is powered down.

Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level. Use of pullup or

pulldown resistors with the bus-hold circuitry is not recommended. The bus-hold circuitry is part of the input

circuit and is not disabled by OE or DIR.

TERMINAL ASSIGNMENTS

1

2

3

4

5

6

A

1CEAB

1LEAB

1OEAB

1OEBA

1LEBA

1CEBA

B

1A2

1A1

GND

GND

1B1

1B2

C

1A4

1A3

1B3

1B4

D

1A6

1A5

GND

GND

1B5

1B6

E

1A8

1A7

1B7

1B8

F

2A1

2A2

2B2

2B1

G

2A3

2A4

GND

GND

2B4

2B3

H

2A5

2A6

2B6

2B5

J

2A7

2A8

GND

GND

2B8

2B7

K

2CEAB

2LEAB

2OEAB

2OEBA

2LEBA

2CEBA

2