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74AC646SC Scheda tecnica(PDF) 1 Page - Fairchild Semiconductor

Il numero della parte 74AC646SC
Spiegazioni elettronici  Octal Transceiver/Register with 3-STATE Outputs
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© 2000 Fairchild Semiconductor Corporation
DS010132
www.fairchildsemi.com
November 1988
Revised October 2000
74AC646 • 74ACT646
Octal Transceiver/Register with 3-STATE Outputs
General Description
The AC/ACT646 consist of registered bus transceiver cir-
cuits, with outputs, D-type flip-flops and control circuitry
providing multiplexed transmission of data directly from the
input bus or from the internal storage registers. Data on the
A or B bus will be loaded into the respective registers on
the LOW-to-HIGH transition of the appropriate clock pin
(CPAB or CPBA). The four fundamental data handling
functions available are illustrated in Figures 1, 2, 3, and
Figure 4.
Features
s Independent registers for A and B buses
s Multiplexed real-time and stored data transfers
s 3-STATE outputs
s 300 mil dual-in-line package
s Outputs source/sink 24 mA
s ACT646 has TTL compatible inputs
Ordering Code:
Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code.
Logic Symbols
IEEE/IEC
Connection Diagram
Pin Descriptions
FACT
 is a trademark of Fairchild Semiconductor Corporation.
Order Number
Package Number
Package Description
74AC646SC
M24B
24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
74AC646SPC
N24C
24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
74ACT646SC
M24B
24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
74ACT646SPC
N24C
24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Pin Names
Description
A0–A7
Data Register A Inputs
Data Register A Outputs
B0–B7
Data Register B Inputs
Data Register B Outputs
CPAB, CPBA
Clock Pulse Inputs
SAB, SBA
Transmit/Receive Inputs
G
Output Enable Input
DIR
Direction Control Input


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