SN54HC594, SN74HC594
8-BIT SHIFT REGISTERS
WITH OUTPUT REGISTERS

SCLS040B - DECEMBER 1982 - REVISED MAY 1997

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of TexasInstruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

features

• 8-Bit Serial-In, Parallel-Out Shift Registers With Storage
• Independent Direct Overriding Clears on Shift and Storage Registers
• Independent Clocks for Both Shift and Storage Registers
• High-Current Outputs Can Drive up to 15 LSTTL Loads
• Package Options Include Plastic Small-Outline (D) and Ceramic Flat (W) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) 300-mil DIPs

description

The 'HC594 contain an 8-bit serial-in, parallel-out shift register that feeds an 8-bit D-type storage register. Separate clocks and direct overriding clear (, ) inputs are provided on both the shift and storage registers. A serial (Q_H´) output is provided for cascading purposes.

Both the shift register (RCLK) and storage register (SRCLK) clocks are positive edge triggered. If both clocks are connected together, the shift register is always one count pulse ahead of the storage register.

The parallel (Q_A-Q_H) outputs have high-current capability. Q_H´ is a standard output.

The SN54HC594 is characterized for operation over the full military temperature range of -55°C to 125°C. The SN74HC594 is characterized for operation from -40°C to 85°C.