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74F646MSA

更新时间： 2024-11-05 22:20:55
品牌 Logo 应用领域
美国国家半导体 - NSC /
页数 文件大小 规格书
12页 204K
描述
Octal Transceiver/Register with TRI-STATE Outputs

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74F646MSA 数据手册

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December 1994  
54F/74F646 74F646B 54F/74F648  
#
#
Octal Transceiver/Register with TRI-STATE Outputs  
É
General Description  
Features  
Y
Independent registers for A and B buses  
These devices consist of bus transceiver circuits with TRI-  
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 provid-  
ed 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 regis-  
ter.  
Y
Multiplexed real-time and stored data  
Y
’F648 has inverting data paths  
Y
’F646/’F646B have non-inverting data paths  
Y
’F646B is a faster version of the ’F646  
Y
TRI-STATE outputs  
Y
300 mil slim DIP  
Y
Guaranteed 4000V minimum ESD protection  
Package  
Number  
Commercial  
74F646SPC  
Military  
Package Description  
N24C  
J24F  
24-Lead (0.300 Wide) Molded Dual-In-Line  
×
54F646DM (Note 2)  
24-Lead (0.300 Wide) Ceramic Dual-In-Line  
×
74F646SC (Note 1)  
74F646MSA (Note 1)  
M24B  
MSA24  
W24C  
E28A  
N24C  
M24B  
N24C  
J24F  
24-Lead (0.300 Wide) Molded Small Outline, JEDEC  
×
24-Lead Molded Shrink Small Outline, EIAJ, Type II  
54F646FM (Note 2)  
54F646LM (Note 2)  
24-Lead Cerpack  
28-Lead Ceramic Leadless Chip Carrier, Type C  
74F646BSPC  
24-Lead (0.300 Wide) Molded Dual-In-Line  
×
74F646BSC (Note 1)  
74F648SPC  
24-Lead (0.300 Wide) Molded Small Outline, JEDEC  
×
24-Lead (0.300 Wide) Molded Dual-In-Line  
×
54F648SDM (Note 2)  
24-Lead (0.300 Wide) Ceramic Dual-In-Line  
×
74F648SC (Note 1)  
M24B  
W24C  
E28A  
24-Lead (0.300 Wide) Molded Small Outline, JEDEC  
×
54F648FM (Note 2)  
54F648LM (Note 2)  
24-Lead Cerpack  
24-Lead Ceramic Leadless Chip Carrier, Type C  
e
Note 1: Devices also available in 13 reel. Use suffix  
SCX.  
×
Note 2: Military grade device with environmental and burn-in processing. Use suffix  
e
DMQB, FMQB and LMQB.  
Logic Symbols  
’F646/’F646B  
’F648  
TL/F/9580–1  
TL/F/9580–7  
TRI-STATEÉ is a registered trademark of National Semiconductor Corporation.  
C
1995 National Semiconductor Corporation  
TL/F/9580  
RRD-B30M75/Printed in U. S. A.  
1234567...12

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