54ACT16474, 74ACT16474

18BIT REGISTERED BUS TRANSCEIVERS

WITH 3STATE OUTPUTS

SCAS238A − MAY 1992 − REVISED APRIL 1996

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POST OFFICE BOX 655303

POST OFFICE BOX 1443

Widebus

 Family

PCB Layout

Configurations Minimize High-Speed

Switching Noise

CMOS) 1-

µm Process

125

°C

Shrink Small-Outline (DL) Packages Using

25-mil Center-to-Center Pin Spacings and

380-mil Fine-Pitch Ceramic Flat (WD)

Packages Using 25-mil Center-to-Center

Pin Spacings

description

The ’ACT16474 are noninverting 18-bit registered

bus transceivers composed of two 9-bit sections

with separate control signals. For either 9-bit

transceiver section, data flow in the A-to-B mode

is controlled by output-enable (1OEAB or 2OEAB)

and clock (1CLKAB or 2CLKAB) inputs. When

1OEAB or 2OEAB is low, the corresponding

outputs are active (high or low) and take on either

the current data on low-to-high transition of

1CLKAB or 2CLKAB or the previously stored data

if 1CLKAB or 2CLKAB is low.

When 1OEAB or 2OEAB is high, the corresponding outputs are in the high-impedance state. 1OEAB or 2OEAB

does not affect the operation on the internal registers. Previously stored data can be retained or new data can

be entered while the outputs are in the high-impedance state.

Data flow from B to A is similar, but uses 1OEBA and/or 2OEBA and 1CLKBA and/or 2CLKBA.

The 74ACT16474 is packaged in TI’s shrink small-outline package, which provides twice the I/O pin count and

functionality of standard small-outline packages in the same printed-circuit-board area.

The 54ACT16474 is characterized for operation over the full military temperature range of −55

°C to 125°C. The

74ACT16474 is characterized for operation from −40

°C to 85°C.

Copyright

 1996, Texas Instruments Incorporated

UNLESS OTHERWISE NOTED this document contains PRODUCTION

DATA information 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.

EPIC and Widebus are trademarks of Texas Instruments Incorporated.

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1OEAB

1CLKAB

1A1

GND

1A2

1A3

1A4

1A5

1A6

GND

1A7

1A8

1A9

2A1

2A2

2A3

GND

2A4

2A5

2A6

2A7

2A8

GND

2A9

2CLKAB

2OEAB

1OEBA

1CLKBA

1B1

GND

1B2

1B3

1B4

1B5

1B6

GND

1B7

1B8

1B9

2B1

2B2

2B3

GND

2B4

2B5

2B6

2B7

2B8

GND

2B9

2CLKBA

2OEBA

54ACT16474 . . . WD PACKAGE

74ACT16474 . . . DL PACKAGE

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