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74AC646

Fairchild Semiconductor
Part Number 74AC646
Manufacturer Fairchild Semiconductor
Description Octal Transceiver/Register
Published Apr 3, 2005
Detailed Description 74AC646 • 74ACT646 Octal Transceiver/Register with 3-STATE Outputs November 1988 Revised December 1998 74AC646 • 74ACT...
Datasheet PDF File 74AC646 PDF File

74AC646
74AC646

Overview
74AC646 • 74ACT646 Octal Transceiver/Register with 3-STATE Outputs November 1988 Revised December 1998 74AC646 • 74ACT646 Octal Transceiver/Register with 3-STATE Outputs General Description The AC/ACT646 consist of registered bus transceiver circuits, 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 Figure 1, Figure 2, Figure 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: Order Number 74AC646SC 74AC646SPC 74ACT646SPC Package Number M24B N24C N24C Package Description 24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.
300” Wide Body 24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-100, 0.
300” Wide 24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-100, 0.
300” Wide Device also available in Tape and Reel.
Specify by appending suffix letter “X” to the ordering code.
Logic Symbols www.
DataSheet4U.
com Connection Diagram Pin Assignment for DIP and SOIC IEEE/IEC Pin Descriptions Pin Names A0–A7 B0–B7 CPAB, CPBA SAB, SBA G DIR FACT™ is a trademark of Fairchild Semiconductor Corporation.
Description Data Register A Inputs Data Register A Outputs Data Register B Inputs Data Register B Outputs Clock Pulse Inputs Transmit/Receive Inputs Output Enable Input Direction Control Input © 1999 Fairchild Semiconductor Corporation DS010132.
prf www.
fairchildsemi.
com 74AC646 • 74ACT646 Function Table Inputs G H H H L L L L L L L L DIR X X X H H H H L L L L CPAB CPBA SAB H or L SBA X X X X X X X L L H H Output Input Input Output Inpu...


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