74AC646_00 FAIRCHILD [Fairchild Semiconductor], 74AC646_00 Datasheet

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74AC646_00

Manufacturer Part Number
74AC646_00
Description
Octal Transceiver/Register with 3-STATE Outputs
Manufacturer
FAIRCHILD [Fairchild Semiconductor]
Datasheet
© 2000 Fairchild Semiconductor Corporation
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.
Ordering Code:
Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code.
Logic Symbols
FACT
Order Number
74AC646SC
74AC646SPC
74ACT646SC
74ACT646SPC
is a trademark of Fairchild Semiconductor Corporation.
Package Number
IEEE/IEC
M24B
N24C
M24B
N24C
24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
DS010132
Features
Connection Diagram
Pin Descriptions
Independent registers for A and B buses
Multiplexed real-time and stored data transfers
3-STATE outputs
300 mil dual-in-line package
Outputs source/sink 24 mA
ACT646 has TTL compatible inputs
A
B
CPAB, CPBA
SAB, SBA
G
DIR
Package Description
0
0
–A
–B
Pin Names
7
7
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
November 1988
Revised October 2000
Description
www.fairchildsemi.com

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74AC646_00 Summary of contents

Page 1

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 ...

Page 2

Function Table Inputs G DIR CPAB CPBA SAB ...

Page 3

Logic Diagram Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. 3 www.fairchildsemi.com ...

Page 4

Absolute Maximum Ratings Supply Voltage ( Input Diode Current ( 0. 0. Input Voltage ( Output Diode Current ( ...

Page 5

DC Electrical Characteristics for ACT V Symbol Parameter (V) V Minimum HIGH Level 4.5 IH Input Voltage 5.5 V Maximum LOW Level 4.5 IL Input Voltage 5.5 V Minimum HIGH Level 4.5 OH Output Voltage 5.5 4.5 5.5 V Maximum ...

Page 6

AC Electrical Characteristics for AC Symbol Parameter t Propagation Delay PLH Clock to Bus t Propagation Delay PHL Clock to Bus t Propagation Delay PLH Bus to Bus t Propagation Delay PHL Bus to Bus t Propagation Delay PLH SBA ...

Page 7

AC Electrical Characteristics for ACT Symbol Parameter t Propagation Delay PLH Clock to Bus t Propagation Delay PHL Clock to Bus t Propagation Delay PLH Bus to Bus t Propagation Delay PHL Bus to Bus t Propagation Delay PLH SBA ...

Page 8

Physical Dimensions inches (millimeters) unless otherwise noted 24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide www.fairchildsemi.com Package Number M24B 8 ...

Page 9

Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right ...

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