54HC21 is DUAL 4-INPUT AND GATE manufactured by STMicroelectronics (official site).
| Part Number | Description |
|---|---|
| 54HC237 | Rad-hard high speed 2 to 6V CMOS logic |
| 54HC240 | Rad-hard high speed 2 to 6V CMOS logic |
| 54HC244 | Rad-hard high speed 2 to 6V CMOS logic |
| 54HC245 | Rad-hard high speed 2 to 6V CMOS logic |
| 54HC251 | Rad-hard high speed 2 to 6V CMOS logic |
The M54/74HC21 is a high speed CMOS DUAL 4INPUT AND GATE fabricated in silicon gate C2MOS technology. It has the same high speed performance of LSTTL bined with true CMOSlow power consumption. The internal circuits is posed of 3 stages including buffered output, which gives high noise immunity and a stable output.
