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 VCC
■ 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
| Type number | Package |
| Temperature range | Name | Description | Version |
| 74AHC595 | | | | |
| 74AHC595D | −40 °C to +125 °C
| SO16 | plastic small outline package;16 leads; body width 3.9 mm | SOT109-1 |
| 74AHC595PW | −40 °C to +125 °C | TSSOP16 | plastic thin shrink small outline package;16 leads; body width 4.4
mm | SOT403-1 |
| 74AHC595BQ | −40 °C to +125 °C | DHVQFN16 | plastic dual in-line compatible thermal enhanced very thin quad
flat package; no leads;16 terminals; body 2.5 × 3.5 ×0.85mm
| SOT763-1 |
5. Functional diagram
