SN54AHCT595, SN74AHCT595 are 8-bit serial-in, parallel-out shift registers with 3-state output registers.
The SN54AHCT595 and SN74AHCT595 devices contain an 8-bit serial-in, parallel-out shift register that feeds an 8-bit D-type storage register. The storage register has parallel 3-state outputs, allowing the data to be driven onto a bus or disabled by placing the output-enable (OE) input high.
These devices feature separate clocks for the shift and storage registers, both of which are positive-edge triggered. They include a direct overriding clear (SRCLR) input for the shift register and support cascading via serial outputs. The SN54AHCT595 is characterized for military temperature ranges (-55°C to 125°C), while the SN74AHCT595 covers commercial temperatures (-40°C to 85°C).
| Operating Temperature (SN54AHCT595) | -55°C to 125°C |
|---|---|
| High-Level Input Voltage | 2 V minimum |
The main difference is their operating temperature range; the SN54AHCT595 operates from -55°C to 125°C, while the SN74AHCT595 operates from -40°C to 85°C.
Yes, the inputs are TTL-voltage compatible.