1. General description
The 74HC594; 74HCT594 is a high-speed Si-gate CMOS device and is pin compatible
with Low-Power Schottky TTL (LSTTL).
The 74HC594; 74HCT594 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
n Synchronous serial input and output
n Complies with JEDEC standard No.7A
n 8-bit parallel output
n Shift and storage registers have independent direct clear and clocks
n Independent clocks for shift and storage registers
n 100 MHz (typical)
n Multiple package options
n Specified from −40 °Cto+85°C and from −40 °C to +125 °C
3. Applications
n Serial-to parallel data conversion
n Remote control holding register
74HC594; 74HCT594
8-bit shift register with output register
Rev. 03 — 20 December 2006 Product data sheet
