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74HC573; 74HCT573
Octal D-type transparent latch; 3-state
Rev. 7 — 4 March 2016
Product data sheet
1. General description
The 74HC573; 74HCT573 is an 8-bit D-type transparent latch with 3-state outputs. The
device features latch enable (LE) and output enable (OE) inputs. When LE is HIGH, data
at the inputs enter the latches. In this condition the latches are transparent, a latch output
will change each time its corresponding D-input changes. When LE is LOW the latches
store the information that was present at the inputs a set-up time preceding the
HIGH-to-LOW transition of LE. 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
latches. Inputs include clamp diodes. This enables the use of current limiting resistors to
interface inputs to voltages in excess of V
CC
.
2. Features and benefits
Input levels:
For 74HC573: CMOS level
For 74HCT573: TTL level
Inputs and outputs on opposite sides of package allowing easy interface with
microprocessors
Useful as input or output port for microprocessors and microcomputers
3-state non-inverting outputs for bus-oriented applications
Common 3-state output enable input
Multiple package options
Complies with JEDEC standard no. 7 A
ESD protection:
HBM JESD22-A114F exceeds 2 000 V
MM JESD22-A115-A exceeds 200 V
Specified from
40 C
to +85
C
and from
40 C
to +125
C
NXP Semiconductors
74HC573; 74HCT573
Octal D-type transparent latch; 3-state
3. Ordering information
Table 1.
Ordering information
Temperature range
74HC573D
74HCT573D
74HC573DB
74HCT573DB
74HC573PW
74HCT573PW
74HC573BQ
74HCT573BQ
40 C
to +125
C
DHVQFN20
40 C
to +125
C
TSSOP20
40 C
to +125
C
SSOP20
40 C
to +125
C
Name
SO20
Description
plastic small outline package; 20 leads;
body width 7.5 mm
plastic shrink small outline package; 20 leads;
body width 5.3 mm
plastic thin shrink small outline package; 20 leads;
body width 4.4 mm
plastic dual in-line compatible thermal enhanced very
thin quad flat package; no leads; 20 terminals;
body 2.5
4.5
0.85 mm
Version
SOT163-1
SOT339-1
SOT360-1
SOT764-1
Type number Package
4. Functional diagram
Fig 1.
Functional diagram
74HC_HCT573
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2016. All rights reserved.
Product data sheet
Rev. 7 — 4 March 2016
2 of 20
NXP Semiconductors
74HC573; 74HCT573
Octal D-type transparent latch; 3-state
Fig 2.
Logic diagram
Fig 3.
Logic symbol
Fig 4.
IEC logic symbol
74HC_HCT573
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2016. All rights reserved.
Product data sheet
Rev. 7 — 4 March 2016
3 of 20
NXP Semiconductors
74HC573; 74HCT573
Octal D-type transparent latch; 3-state
5. Pinning information
5.1 Pinning
(1) This is not a supply pin. The substrate is attached to this
pad using conductive die attach material. There is no
electrical or mechanical requirement to solder this pad.
However, if it is soldered, the solder land should remain
floating or be connected to GND.
Fig 5.
Pin configuration SO20, SSOP20 and
TSSOP20
Fig 6.
Pin configuration DHVQFN20
5.2 Pin description
Table 2.
Symbol
OE
D[0:7]
GND
LE
Q[0:7]
V
CC
Pin description
Pin
1
2, 3, 4, 5, 6, 7, 8, 9
10
11
19, 18, 17, 16, 15, 14, 13, 12
20
Description
3-state output enable input (active LOW)
data input
ground (0 V)
latch enable input (active HIGH)
3-state latch output
supply voltage
74HC_HCT573
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2016. All rights reserved.
Product data sheet
Rev. 7 — 4 March 2016
4 of 20
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