Page 1
DATA SH EET
Product specification
File under Integrated Circuits, IC06
September 1993
INTEGRATED CIRCUITS
74HC/HCT373
Octal D-type transparent latch;
3-state
For a complete data sheet, please also download:
•The IC06 74HC/HCT/HCU/HCMOS Logic Family Specifications
•The IC06 74HC/HCT/HCU/HCMOS Logic Package Information
•The IC06 74HC/HCT/HCU/HCMOS Logic Package Outlines
Page 2
September 1993 2
Philips Semiconductors Product specification
Octal D-type transparent latch; 3-state 74HC/HCT373
FEATURES
• 3-state non-inverting outputs for bus oriented
applications
• Common 3-state output enable input
• Functionally identical to the “563”, “573” and “533”
• Output capability: bus driver
• ICC category: MSI
GENERAL DESCRIPTION
The 74HC/HCT373 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 74HC/HCT373 are octal D-type transparent latches
featuring separate D-type inputs for each latch and 3-state
outputs for bus oriented applications. A latch enable (LE)
input and an output enable (
OE) input are common to all
latches.
The “373” consists of eight D-type transparent latches with
3-state true outputs. When LE is HIGH, data at the D
n
inputs enters the latches. In this condition the latches are
transparent, i.e. a latch output will change state each time
its corresponding D-input changes.
When LE is LOW the latches store the information that was
present at the D-inputs a set-up time preceding the
HIGH-to-LOW transition of LE. When OE is LOW, the
contents of the 8 latches are available at the outputs.
When 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 “373” is functionally identical to the “533”, “563” and
“573”, but the “563” and “533” have inverted outputs and
the “563” and “573” have a different pin arrangement.
QUICK REFERENCE DATA
GND = 0 V; T
amb
=25°C; tr=tf= 6 ns
Notes
1. C
PD
is used to determine the dynamic power dissipation (PD in µW):
PD=CPD× V
CC
2
× fi+∑ (CL× V
CC
2
× fo) where:
fi= input frequency in MHz
fo= output frequency in MHz
∑ (CL× V
CC
2
× fo) = sum of outputs
CL= output load capacitance in pF
VCC= supply voltage in V
2. For HC the condition is VI= GND to VCC. For HCT the condition is VI= GND to VCC− 1.5 V
ORDERING INFORMATION
See
“74HC/HCT/HCU/HCMOS Logic Package Information”
.
SYMBOL PARAMETER CONDITIONS
TYPICAL
UNIT
HC HCT
t
PHL
/ t
PLH
propagation delay CL= 15 pF; VCC=5V
D
n
to Q
n
12 14 ns
LE to Q
n
15 13 ns
C
I
input capacitance 3.5 3.5 pF
C
PD
power dissipation capacitance per latch notes 1 and 2 45 41 pF
Page 3
September 1993 3
Philips Semiconductors Product specification
Octal D-type transparent latch; 3-state 74HC/HCT373
PIN DESCRIPTION
PIN NO. SYMBOL NAME AND FUNCTION
1
OE 3-state output enable input (active LOW)
2, 5, 6, 9, 12, 15, 16, 19 Q
0
to Q
7
3-state latch outputs
3, 4, 7, 8, 13, 14, 17, 18 D
0
to D
7
data inputs
10 GND ground (0 V)
11 LE latch enable input (active HIGH)
20 V
CC
positive supply voltage
Fig.1 Pin configuration. Fig.2 Logic symbol. Fig.3 IEC logic symbol.
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September 1993 4
Philips Semiconductors Product specification
Octal D-type transparent latch; 3-state 74HC/HCT373
Fig.4 Functional diagram.
Fig.5 Logic diagram (one latch).
FUNCTION TABLE
Notes
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
I = LOW voltage level one set-up time prior to the
HIGH-to-LOW LE transition
X = don’t care
Z = high impedance OFF-state
OPERATING
MODES
INPUTS
INTERNAL
LATCHES
OUTPUTS
OE LE D
n
Q0to Q
7
enable and
read
register
(transparent
mode)
LLHHL
H
L
H
L
H
latch and
read registerLLLLlh
L
H
L
H
latch register
and disable
outputs
HHXXX
X
X
X
Z
Z
Fig.6 Logic diagram.
Page 5
September 1993 5
Philips Semiconductors Product specification
Octal D-type transparent latch; 3-state 74HC/HCT373
DC CHARACTERISTICS FOR 74HC
For the DC characteristics see
“74HC/HCT/HCU/HCMOS Logic Family Specifications”
.
Output capability: bus driver
ICC category: MSI
AC CHARACTERISTICS FOR 74HC
GND = 0 V; t
r=tf
= 6 ns; CL=50pF
SYMBOL PARAMETER
T
amb
(°C)
UNIT
TEST CONDITIONS
74HC
V
CC
(V)
WAVEFORMS
+25 −40 to +85 −40 to +125
min. typ. max. min. max. min. max.
t
PHL
/ t
PLH
propagation delay
Dn to Q
n
41
15
12
150
30
26
190
38
33
225
45
38
ns 2.0
4.5
6.0
Fig.7
t
PHL
/ t
PLH
propagation delay
LE to Q
n
50
18
14
175
35
30
220
44
37
265
53
45
ns 2.0
4.5
6.0
Fig.8
t
PZH
/ t
PZL
3-state output enable time
OE to Q
n
44
16
13
150
30
26
190
38
33
225
45
38
ns 2.0
4.5
6.0
Fig.9
t
PHZ
/ t
PLZ
3-state output disable time
OE to Q
n
47
17
14
150
30
26
190
38
33
225
45
38
ns 2.0
4.5
6.0
Fig.9
t
THL
/ t
TLH
output transition time 14
5
4
60
12
10
75
15
13
90
18
15
ns 2.0
4.5
6.0
Fig.7
t
W
LE pulse width
HIGH
80
16
14
17
6
5
100
20
17
120
24
20
ns 2.0
4.5
6.0
Fig.8
t
su
set-up time
Dn to LE
50
10
9
14
5
4
65
13
11
75
15
13
ns 2.0
4.5
6.0
Fig.10
t
h
hold time
Dn to LE
5
5
5
−8
−3
−2
5
5
5
5
5
5
ns 2.0
4.5
6.0
Fig.10
Page 6
September 1993 6
Philips Semiconductors Product specification
Octal D-type transparent latch; 3-state 74HC/HCT373
DC CHARACTERISTICS FOR 74HCT
For the DC characteristics see
“74HC/HCT/HCU/HCMOS Logic Family Specifications”
.
Output capability: bus driver
ICC category: MSI
Note to HCT types
The value of additional quiescent supply current (∆I
CC
) for a unit load of 1 is given in the family specifications.
To determine ∆ICC per input, multiply this value by the unit load coefficient shown in the table below.
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; t
r=tf
= 6 ns; CL=50pF
INPUT UNIT LOAD COEFFICIENT
D
n
LE
OE
0.30
1.50
1.00
SYMBOL PARAMETER
T
amb
(°C)
UNIT
TEST CONDITIONS
74HCT
V
CC
(V)
WAVEFORMS
+25 −40 to +85 −40 to +125
min. typ. max. min. max. min. max.
t
PHL
/ t
PLH
propagation delay
Dn to Q
n
17 30 38 45 ns 4.5 Fig.7
t
PHL
/ t
PLH
propagation delay
LE to Q
n
16 32 40 48 ns 4.5 Fig.8
t
PZH
/ t
PZL
3-state output enable time
OE to Q
n
19 32 40 48 ns 4.5 Fig.9
t
PHZ
/ t
PLZ
3-state output disable time
OE to Q
n
18 30 38 45 ns 4.5 Fig.9
t
THL
/ t
TLH
output transition time 5 12 15 18 ns 4.5 Fig.7
t
W
LE pulse width
HIGH
16 4 20 24 ns 4.5 Fig.8
t
su
set-up time
Dn to LE
12 6 15 18 ns 4.5 Fig.10
t
h
hold time
Dn to LE
4 −1 4 4 ns 4.5 Fig.10
Page 7
September 1993 7
Philips Semiconductors Product specification
Octal D-type transparent latch; 3-state 74HC/HCT373
AC WAVEFORMS
Fig.7 Waveforms showing the input (Dn) to output
(Qn) propagation delays and the output
transition times.
(1) HC : VM= 50%; VI= GND to VCC.
HCT : V
M
= 1.3 V; VI= GND to 3 V.
Fig.8 Waveforms showing the latch enable input
(LE) pulse width, the latch enable input to
output (Qn) propagation delays and the
output transition times.
(1) HC : VM= 50%; VI= GND to VCC.
HCT : V
M
= 1.3 V; VI= GND to 3 V.
Fig.9 Waveforms showing the 3-state enable and disable times.
(1) HC : VM= 50%; VI= GND to VCC.
HCT : V
M
= 1.3 V; VI= GND to 3 V.
Fig.10 Waveforms showing the data set-up and hold times for Dn input to LE input.
The shaded areas indicate when the input is permitted to
change for predictable output performance.
(1) HC : V
M
= 50%; VI= GND to VCC.
HCT : V
M
= 1.3 V; VI= GND to 3 V.
Page 8
September 1993 8
Philips Semiconductors Product specification
Octal D-type transparent latch; 3-state 74HC/HCT373
PACKAGE OUTLINES
See
“74HC/HCT/HCU/HCMOS Logic Package Outlines”
.
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