INTEGRATED CIRCUITS
DATA SHEET
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
74HC/HCT574
Octal D-type flip-flop; positive
edge-trigger; 3-state
Product specification
File under Integrated Circuits, IC06
December 1990
Philips Semiconductors
Product specification
Octal D-type flip-flop; positive
edge-trigger; 3-state
FEATURES
•
3-state non-inverting outputs for
bus oriented applications
•
8-bit positive edge-triggered
register
•
Common 3-state output enable
input
•
Independent register and 3-state
buffer operation
•
Output capability: bus driver
•
I
CC
category: MSI
GENERAL DESCRIPTION
The 74HC/HCT574 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/HCT574 are octal D-type
flip-flops featuring separate D-type
inputs for each flip-flop and
non-inverting 3-state outputs for bus
oriented applications. A clock (CP)
and an output enable (OE) input are
common to all flip-flops.
74HC/HCT574
The 8 flip-flops will store the state of
their individual D-inputs that meet the
set-up and hold time requirements on
the LOW-to-HIGH CP transition.
When OE is LOW, the contents of the
8 flip-flops 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 flip-flops.
The “574” is functionally identical to
the “564”, but has non-inverting
outputs.
The “574” is functionally identical to
the “374”, but has a different pinning.
QUICK REFERENCE DATA
GND = 0 V; T
amb
= 25
°C;
t
r
= t
f
= 6 ns
TYPICAL
SYMBOL
t
PHL/
t
PLH
f
max
C
I
C
PD
Notes
1. C
PD
is used to determine the dynamic power dissipation (P
D
in
µW):
P
D
= C
PD
×
V
CC2
×
f
i
+ ∑
(C
L
×
V
CC2
×
f
o
) where:
f
i
= input frequency in MHz
f
o
= output frequency in MHz
∑
(C
L
×
V
CC2
×
f
o
) = sum of outputs
C
L
= output load capacitance in pF
V
CC
= supply voltage in V
2. For HC the condition is V
I
= GND to V
CC
For HCT the condition is V
I
= GND to V
CC
−
1.5 V
ORDERING INFORMATION
See
“74HC/HCT/HCU/HCMOS Logic Package Information”.
PARAMETER
propagation delay CP to Q
n
maximum clock frequency
input capacitance
power dissipation capacitance per flip-flop
notes 1 and 2
CONDITIONS
HC
C
L
= 15 pF; V
CC
= 5 V
14
123
3.5
22
HCT
15
76
3.5
25
ns
MHz
pF
pF
UNIT
December 1990
2
Philips Semiconductors
Product specification
Octal D-type flip-flop; positive edge-trigger;
3-state
PIN DESCRIPTION
PIN NO.
1
2, 3, 4, 5, 6, 7, 8, 9
10
11
19, 18, 17, 16, 15, 14, 13, 12
20
SYMBOL
OE
D
0
to D
7
GND
CP
Q
0
to Q
7
V
CC
NAME AND FUNCTION
74HC/HCT574
3-state output enable input (active LOW)
data inputs
ground (0 V)
clock input (LOW-to-HIGH, edge-triggered)
3-state flip-flop outputs
positive supply voltage
Fig.1 Pin configuration.
Fig.2 Logic symbol.
Fig.3 IEC logic symbol.
December 1990
3
Philips Semiconductors
Product specification
Octal D-type flip-flop; positive edge-trigger;
3-state
FUNCTION TABLE
OPERATING
MODES
load and read
register
load register and
disable outputs
Notes
INPUTS
OE
L
L
H
H
CP
↑
↑
↑
↑
D
n
l
h
l
h
74HC/HCT574
INTERNAL
FLIP-FLOPS
L
H
L
H
OUTPUTS
Q
0
to Q
7
L
H
Z
Z
1. H = HIGH voltage level
h = HIGH voltage level one set-up time prior to the LOW-to-HIGH
CP transition
L = LOW voltage level
l = LOW voltage level on set-up time prior to the LOW-to-HIGH
CP transition
Z = HIGH impedance OFF-state
↑
= LOW-to-HIGH clock transition
Fig.4 Functional diagram.
Fig.5 Logic diagram.
December 1990
4
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