74F646
器件描述：Octal Transceiver/Register with 3-STATE Outputs
器件厂商：FAIRCHILD [Fairchild Semiconductor]
文件大小：78.37KB，共9页
Sponsor by e络盟器件资料摘要：
© 1999 Fairchild Semiconductor Corporation DS009580 www.fairchildsemi.com
March 1988
Revised August 1999
7
4F646
•
74F646
B
•
7
4F648 O
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t
a
l
T
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anscei
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egist
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3-
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A
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E Output
s
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 pro-
vided 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
a73 Independent registers for A and B buses
a73 Multiplexed real-time and stored data
a73 74F648 has inverting data paths
a73 74F646/74F646B have non-inverting data paths
a73 74F646B is a faster version of the 74F646
a73 3-STATE outputs
a73 300 mil slim DIP
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the 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-100, 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-100, 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-100, 0.300 Wide
March 1988
Revised August 1999
7
4F646
•
74F646
B
•
7
4F648 O
c
t
a
l
T
r
anscei
ver/
R
egist
er wit
h
3-
ST
A
T
E Output
s
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 pro-
vided 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
a73 Independent registers for A and B buses
a73 Multiplexed real-time and stored data
a73 74F648 has inverting data paths
a73 74F646/74F646B have non-inverting data paths
a73 74F646B is a faster version of the 74F646
a73 3-STATE outputs
a73 300 mil slim DIP
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the 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-100, 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-100, 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-100, 0.300 Wide