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74F646

Octal Transceiver/Register with 3-STATE Outputs

Fairchild Semiconductor 

March 1988

Revised October 2000

74F646 • 74F646B • 74F648

Octal Transceiver/Register with 3-STATE Outputs

General Description

These devices consist of bus transceiver circuits with

3-STATE, D-type flip-flops, and control circuitry arranged

for multiplexed transmission of data directly from the input

bus or from the internal registers. Data on the A or B bus

will be clocked into the registers as the appropriate clock

pin goes to a high logic level. Control G and direction pins

are provided to control the transceiver function. In the

transceiver mode, data present at the high impedance port

may be stored in either the A or the B register or in both.

The select controls can multiplex stored and real-time

(transparent mode) data. The direction control determines

which bus will receive data when the enable control G is

Active LOW. In the isolation mode (control G HIGH), A data

may be stored in the B register and/or B data may be

stored in the A register.

Features

s Independent registers for A and B buses

s Multiplexed real-time and stored data

s 74F648 has inverting data paths

s 74F646/74F646B have non-inverting data paths

s 74F646B is a faster version of the 74F646

s 3-STATE outputs

s 300 mil slim DIP

Ordering Code:

Order Number Package Number

Package Description

74F646SC

M24B

24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide

74F646MSA

MSA24

24-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide

74F646SPC

N24C

24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide

74F646BSC

M24B

24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide

74F646BSPC

N24C

24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide

74F648SC

M24B

24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide

74F648SPC

N24C

24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide

Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.

© 2000 Fairchild Semiconductor Corporation DS009580

www.fairchildsemi.com

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