1. General description

The 74AHC595; 74AHCT595 are high-speed Si-gate CMOS devices and are pin

compatible with Low-power Schottky TTL (LSTTL). They are specified in compliance with

JEDEC standard No. 7A.

The 74AHC595; 74AHCT595 are 8-stage serial shift registers with a storage register and

3-state outputs. The registers have separate clocks.

Data is shifted on the positive-going transitions of the shift register clock input (SHCP).

The data in each register is transferred to the storage register on a positive-going

transition of the storage register clock input (STCP). If both clocks are connected together,

the shift register will always be one clock pulse ahead of the storage register.

The shift register has a serial input (DS) and a serial standard output (Q7S) for cascading.

It is also provided with asynchronous reset (active LOW) for all 8 shift register stages. The

storage register has 8 parallel 3-state bus driver outputs. Data in the storage register

appears at the output whenever the output enable input (OE) is LOW

2. Features

■ Balanced propagation delays

■ All inputs have Schmitt-trigger action

■ Inputs accept voltages higher than V_CC

■ Input levels:

◆ The 74AHC595 operates with CMOS input levels

◆ The 74AHCT595 operates with TTL input levels

■ ESD protection:

◆ HBM JESD22-A114E exceeds 2000 V

◆ MM JESD22-A115-A exceeds 200 V

◆ CDM JESD22-C101C exceeds 1000 V

■ Multiple package options

■ Specified from −40 °C to +85 °C and from −40 °C to +125 °C

3. Applications

■ Serial-to-parallel data conversion

■ Remote control holding register

4. Ordering information

5. Functional diagram

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