74AHC573; 74AHCT573
Octal D-type transparant latch; 3-state
Rev. 03 — 24 April 2008
Product data sheet
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:
•
74AHC563; 74AHCT563 which has inverted outputs and a different pin arrangement
•
74AHC373; 74AHCT373 which has a different pin arrangement
2. Features
I
I
I
I
I
I
Balanced propagation delays
All inputs have a Schmitt-trigger action
Common 3-state output enable input
Functionally identical to the 74AHC563; 74AHCT563 and 74AHC373; 74AHCT373
Inputs accept voltages higher than V
CC
Input levels:
N
For 74AHC573: CMOS input level
N
For 74AHCT573: TTL input level
I
ESD protection:
N
HBM EIA/JESD22-A114E exceeds 2000 V
N
MM EIA/JESD22-A115-A exceeds 200 V
N
CDM EIA/JESD22-C101C exceeds 1000 V
I
Multiple package options
I
Specified from
−40 °C
to +85
°C
and from
−40 °C
to +125
°C
NXP Semiconductors
74AHC573; 74AHCT573
Octal D-type transparant latch; 3-state
3. Ordering information
Table 1.
Ordering information
Package
Temperature range
74AHC573
74AHC573D
74AHC573PW
74AHCT573
74AHCT573D
74AHCT573PW
−40 °C
to +125
°C
−40 °C
to +125
°C
SO20
TSSOP20
plastic small outline package; 20 leads;
body width 7.5 mm
plastic thin shrink small outline package; 20 leads;
body width 4.4 mm
SOT163-1
SOT360-1
−40 °C
to +125
°C
−40 °C
to +125
°C
SO20
TSSOP20
plastic small outline package; 20 leads;
body width 7.5 mm
plastic thin shrink small outline package; 20 leads;
body width 4.4 mm
SOT163-1
SOT360-1
Name
Description
Version
Type number
4. Functional diagram
2
3
4
5
6
7
8
9
D0
D1
D2
D3
D4
D5
D6
D7
LATCH
1 to 8
3-STATE
OUTPUTS
Q0 19
Q1 18
Q2 17
Q3 16
Q4 15
Q5 14
Q6 13
Q7 12
11 LE
1 OE
mna809
Fig 1.
Functional diagram
74AHC_AHCT573_3
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 03 — 24 April 2008
2 of 17
NXP Semiconductors
74AHC573; 74AHCT573
Octal D-type transparant latch; 3-state
5. Pinning information
5.1 Pinning
OE
D0
D1
D2
D3
D4
D5
D6
D7
1
2
3
4
5
6
7
8
9
20 V
CC
19 Q0
18 Q1
17 Q2
16 Q3
15 Q4
14 Q5
13 Q6
12 Q7
11 LE
001aad099
573
GND 10
Fig 5.
Pin configuration SO20 and TSSOP20
5.2 Pin description
Table 2.
Symbol
OE
D0
D1
D2
D3
D4
D5
D6
D7
GND
LE
Q7
Q6
Q5
Q4
Q3
Q2
Q1
Q0
V
CC
Pin description
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Description
3-state output enable input (active LOW)
data input 0
data input 1
data input 2
data input 3
data input 4
data input 5
data input 6
data input 7
ground (0 V)
latch enable input (active HIGH)
3-state latch output 7
3-state latch output 6
3-state latch output 5
3-state latch output 4
3-state latch output 3
3-state latch output 2
3-state latch output 1
3-state latch output 0
supply voltage
74AHC_AHCT573_3
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 03 — 24 April 2008
4 of 17
NXP Semiconductors
74AHC573; 74AHCT573
Octal D-type transparant latch; 3-state
6. Functional description
Table 3.
Function table
[1]
Input
OE
Enable and read register (transparent
mode)
Latch and read register
Latch register and disable outputs
L
L
H
LE
H
L
L
Dn
L
H
l
h
l
h
[1]
H = HIGH voltage level;
h = HIGH voltage level one set-up time prior to the HIGH-to-LOW LE transition;
L = LOW voltage level;
l = LOW voltage level one set-up time prior to the HIGH-to-LOW LE transition;
Z = high-impedance OFF-state.
Operating mode
Internal latch
L
H
L
H
L
H
Output
Q0 to Q7
L
H
L
H
Z
Z
7. Limiting values
Table 4.
Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to GND (ground = 0 V).
Symbol
V
CC
V
I
I
IK
I
OK
I
O
I
CC
I
GND
T
stg
P
tot
[1]
[2]
Parameter
supply voltage
input voltage
input clamping current
output clamping current
output current
supply current
ground current
storage temperature
total power dissipation
Conditions
Min
−0.5
−0.5
Max
+7.0
+7.0
-
+20
+25
+75
-
+150
500
Unit
V
V
mA
mA
mA
mA
mA
°C
mW
V
I
<
−0.5
V
V
O
<
−0.5
V or V
O
> V
CC
+ 0.5 V
V
O
=
−0.5
V to (V
CC
+ 0.5 V)
[1]
[1]
−20
−20
−25
-
−75
−65
T
amb
=
−40 °C
to +125
°C
[2]
-
The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
For SO20 packages: above 70
°C
the value of P
tot
derates linearly at 8 mW/K.
For TSSOP20 packages: above 60
°C
the value of P
tot
derates linearly at 5.5 mW/K.
74AHC_AHCT573_3
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 03 — 24 April 2008
5 of 17
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