These SN74LS595 devices each 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 ('LS595) or open-collector ('LS596) outputs. Separate clocks are provided for both the shift register and the storage register. The shift register has a direct-overriding clear, serial input, and serial output pins for cascading.

Both the shift register and storage register clocks are positive-edge triggered. If the user wishes to connect both clocks together, the shift register state will always be one clock pulse ahead of the storage register.

Features:

8-Bit Serial-In, Parallel-Out Shift Registers with Storage
Choice of 3-State ('LS595) or Open-Collector ('LS596) Parallel Outputs
Shift Register Has Direct Clear
Accurate Shift Frequency:DC to 20 MHz

The SN74HC595 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. Separate clocks are provided for both the shift and storage register. The shift register has a direct overriding clear (SRCLR) input, serial (SER) input, and serial outputs for cascading. When the output-enable (OE) input is high, the outputs are in the high-impedance state.

Features:

8-Bit Serial-In, Parallel-Out Shift
Wide Operating Voltage Range of 2 V to 6 V
High-Current 3-State Outputs Can Drive Up to 15
LSTTL Loads
Low Power Consumption: 80-µA (Maximum) ICC
tpd = 13 ns (Typical)
±6-mA Output Drive at 5 V
Low Input Current: 1 µA (Maximum)
Shift Register Has Direct Clear
On Products Compliant to MIL-PRF-38535, All Parameters Are Tested Unless Otherwise Noted. On All Other Products, Production Processing Does Not Necessarily include Testing of All Parameters.