SN54HC595, SN74HC595
8-BIT SHIFT REGISTERS
WITH 3-STATE OUTPUT REGISTERS

SCLS041B - DECEMBER 1982 - REVISED MAY 1997

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features

• 8-Bit Serial-In, Parallel-Out Shift
• High-Current 3-State Outputs Can Drive up to 15 LSTTL Loads
• Shift Register Has Direct Clear
• 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 'HC595 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. Separate clocks are provided for both the shift and storage register. The shift register has a direct overriding clear () input, serial (SER) input, and serial outputs for cascading.

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

The SN54HC595 is characterized for operation over the full military temperature range of -55°C to 125°C. The SN74HC595 is characterized for operation from -40°C to 85°C.