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These devices contain two independent 4-input NAND gates. They perform the Boolean functions Y = A • B • C • D or Y = A + B + C + D in positive logic. The SN54F20 is characterized for operation over the full military temperature range of – 55°C to 125°C. The SN74F20 is characterized for operation from 0°C to 70°C. SDFS041A – MARCH 1987 – REVISED OCTOBER 199.
6
16 NC
NC 7
15 NC
1D 8
14 2B
9 10 11 12 13
2A
2Y
NC
GND
1Y
NC
– No internal connection
6 1Y
8 2Y
† This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12. Pin numbers shown are for the D, J, and N packages.
logic diagram, each gate (positive logic)
A
B
Y
C
D
PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.
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Copyright © 19.
| No. | Partie # | Fabricant | Description | Fiche Technique |
|---|---|---|---|---|
| 1 | SN54F21 |
Texas Instruments |
Dual 4-Input Positive-AND Gates |
|
| 2 | SN54F240 |
Texas Instruments |
OCTAL BUFFERS/DRIVERS |
|
| 3 | SN54F241 |
Texas Instruments |
OCTAL BUFFERS/DRIVERS |
|
| 4 | SN54F243 |
Texas Instruments |
QUADRUPLE BUS TRANSCEIVERS |
|
| 5 | SN54F244 |
Texas Instruments |
OCTAL BUFFERS/DRIVERS |
|
| 6 | SN54F245 |
Texas Instruments |
OCTAL BUS TRANSCEIVERS |
|
| 7 | SN54F251B |
Texas Instruments |
1-of-8 Data Selectors/Multiplexers |
|
| 8 | SN54F253 |
Texas Instruments |
Dual 1-of-4 Data Selector/Multiplexers |
|
| 9 | SN54F257 |
Texas Instruments |
Quadruple 2-Line To 1-Line Data Selectors/Multiplexers |
|
| 10 | SN54F258 |
Texas Instruments |
Quadruple 2-Line To 1-Line Data Selectors/Multiplexers |
|
| 11 | SN54F27 |
Texas Instruments |
TRIPLE 3-INPUT POSITIVE-NOR GATES |
|
| 12 | SN54F280B |
Texas Instruments |
9-Bit Parity Generators/Checkers |
|