1. General description
The 74AHC573; 74AHCT573 is a high-speed Si-gate CMOS device and is pin compatible
with Low-power Schottky TTL (LSTTL). It is specified in compliance with JEDEC standard
No. 7A.
The 74AHC573; 74AHCT573 consists of eight D-type transparent latches featuring
separate D-type inputs for each latch and 3-state true outputs for bus oriented
applications. A latch enable input (LE) and an output enable input (OE
) are common to all
latches.
When pin LE is HIGH, data at the Dn inputs enters the latches. In this condition the
latches are transparent, i.e. a latch output will change state each time its corresponding
Dn input changes. When pin LE is LOW, the latches store the information that is present
at the Dn inputs, after a set-up time preceding the HIGH-to-LOW transition of LE.
When pin OE
is LOW, the contents of the 8 latches are available at the outputs. When
pin OE
is HIGH, the outputs go to the high-impedance OFF-state. Operation of the OE
input does not affect the state of the latches.
The 74AHC573; 74AHCT573 is functionally identical to the 74AHC373; 74AHCT373, but
has a different pin arrangement.
2. Features and benefits
Balanced propagation delays
All inputs have a Schmitt trigger action
Common 3-state output enable input
Functionally identical to the 74AHC373; 74AHCT373
Inputs accept voltages higher than V
CC
Input levels:
For 74AHC573: CMOS input level
For 74AHCT573: TTL input level
ESD protection:
HBM EIA/JESD22-A114E exceeds 2000 V
MM EIA/JESD22-A115-A exceeds 200 V
CDM EIA/JESD22-C101C exceeds 1000 V
Multiple package options
Specified from 40 C to +85 C and from 40 C to +125 C
74AHC573; 74AHCT573
Octal D-type transparant latch; 3-state
Rev. 7 — 8 November 2011 Product data sheet
