1. General description
The 74LV595 is an 8-bit serial-in/serial or parallel-out shift register with a storage register and
3-state outputs. Both the shift and storage register have separate clocks. The device features a
serial input (DS) and a serial output (Q7S) to enable cascading and an asynchronous reset MR
input. A LOW on MR will reset the shift register. Data is shifted on the LOW-to-HIGH transitions
of the SHCP input. The data in the shift register is transferred to the storage register on a
LOW-to-HIGH transition of the STCP input. If both clocks are connected together, the shift register
will always be one clock pulse ahead of the storage register. Data in the storage register appears
at the output whenever the output enable input (OE) is LOW. A HIGH on OE causes the outputs
to assume a high-impedance OFF-state. Operation of the OE input does not affect the state of the
registers. Inputs include clamp diodes. This enables the use of current limiting resistors to interface
inputs to voltages in excess VCC.
2. Features and benefits
• Wide supply voltage range from 1.0 V to 3.6 V
• CMOS low power dissipation
• Direct interface with TTL levels
• Typical output ground bounce < 0.8 V at VCC = 3.3 V and Tamb = 25 °C
• Typical HIGH-level output voltage (VOH) undershoot: > 2 V at VCC = 3.3 V and Tamb = 25 °C
• Has a shift register with direct clear
• Output capability:
• Parallel outputs; bus driver
• Serial output; standard
• Latch-up performance exceeds 100 mA per JESD 78 Class II Level B
• Complies with JEDEC standards
• JESD8-7 (1.65 V to 1.95 V)
• JESD8-5 (2.3 V to 2.7 V)
• JESD8C (2.7 V to 3.6 V)
• ESD protection:
• HBM JESD22-A114E exceeds 2000 V
• MM JESD22-A115-A exceeds 200 V
• Multiple package options
• Specified from -40 °C to 85 °C and -40 °C to 125 °C
3. Applications
• Serial-to-parallel data conversion
• Remote control holding register