CY54FCT543T, CY74FCT543T

8-BIT LATCHED REGISTERED TRANSCEIVERS

WITH 3-STATE OUTPUTS

SCCS030A – MAY 1994 – REVISED OCTOBER 2001

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POST OFFICE BOX 655303

With FCT and F Logic

of Equivalent FCT Functions

Significantly Improved Noise

Characteristics

Operation

Output Logic Levels

– 2000-V Human-Body Model (A114-A)

– 200-V Machine Model (A115-A)

– 1000-V Charged-Device Model (C101)

Direction

– 48-mA Output Sink Current

– 12-mA Output Source Current

– 64-mA Output Sink Current

– 32-mA Output Source Current

description

The ’FCT543T octal latched transceivers contain two sets of eight D-type latches with separate latch-enable

(LEAB, LEBA) and output-enable (OEAB, OEBA) inputs for each set to permit independent control of input and

output in either direction of data flow. For data flow from A to B, for example, the A-to-B enable (CEAB) input

must be low in order to enter data from A or to take data from B, as indicated in the function table. With CEAB

low, a low signal on the A-to-B latch-enable (LEAB) input makes the A-to-B latches transparent; a subsequent

low-to-high transition of the LEAB signal puts the A latches in the storage mode and their outputs no longer

change with the A inputs. With CEAB and OEAB low, the 3-state B-output buffers are active and reflect the data

present at the output of the A latches. Control of data from B to A is similar, but uses CEBA, LEBA, and OEBA

inputs.

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

Copyright

 2001, Texas Instruments Incorporated

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

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LEBA

OEBA

CEAB

GND

CEBA

LEAB

OEAB

CY54FCT543T ...D PACKAGE

CY74FCT543T ...Q OR SO PACKAGE

(TOP VIEW)

On products compliant to MIL-PRF-38535, all parameters are tested

unless otherwise noted. On all other products, production

processing does not necessarily include testing of all parameters.