1. General description

The 74AHC594; 74AHCT594 is a high-speed Si-gate CMOS device and is pin compatible with

Low-Power Schottky TTL (LSTTL). It is specified in compliance with JEDEC standard No. 7-A.

The 74AHC594; 74AHCT594 is an 8-bit, non-inverting, serial-in, parallel-out shift register that

feeds an 8-bit D-type storage register. Separate clocks (SHCP and STCP) and direct overriding

clears (SHR and STR) are provided on both the shift and storage registers. A serial output (Q7S) is

provided for cascading purposes.

Both the shift and storage register clocks are positive-edge triggered. If the user wishes to connect

both clocks together, the shift register will always be one count pulse ahead of the storage register.

2. Features and benefits

• Wide supply voltage range from 2.0 V to 5.5 V

• Balanced propagation delays

• All inputs have Schmitt-trigger action

• Overvoltage tolerant inputs to 5.5 V

• High noise immunity

• CMOS low power dissipation

• 8-bit serial-in, parallel-out shift register with storage

• Independent direct overriding clears on shift and storage registers

• Independent clocks for shift and storage registers

• Latch-up performance exceeds 100 mA per JESD 78 Class II Level A

• Input levels:

• For 74AHC594: CMOS level

• For 74AHCT594: TTL level

• ESD protection:

• HBM JESD22-A114F exceeds 2000 V

• MM JESD22-A115-A exceeds 200 V

• CDM JESD22-C101E exceeds 1000 V

• Multiple package options

• Specified from -40 °C to +85 °C and from -40 °C to +125 °C

3. Applications

• Serial-to parallel data conversion

• Remote control holding register