74AC74
DUAL D-TYPE FLIP FLOP WITH PRESET AND CLEAR
April 1997
s
HIGH SPEED:
f
MAX
= 300 MHz (TYP.) at V
CC
= 5V
s
LOW POWER DISSIPATION:
I
CC
= 4
A (MAX.) at T
A
= 25
o
C
s
HIGH NOISE IMMUNITY:
V
NIH
= V
NIL
= 28% V
CC
(MIN.)
s
50
TRANSMISSION LINE DRIVING
CAPABILITY
s
SYMMETRICAL OUTPUT IMPEDANCE:
|I
OH
| = I
OL
= 24 mA (MIN)
s
BALANCED PROPAGATION DELAYS:
t
PLH
t
PHL
s
OPERATING VOLTAGE RANGE:
V
CC
(OPR) = 2V to 6V
s
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 74
s
IMPROVED LATCH-UP IMMUNITY
DESCRIPTION
The AC74 is an advanced high-speed CMOS
OCTAL D-TYPE FLIP FLOP WITH PRESET AND
CLEAR
NON
INVERTING
fabricated
with
sub-micron silicon gate and double-layer metal
wiring C
2
MOS technology.
A signal on the D INPUT is transferred to the Q
OUTPUT during the positive going transition of
the clock pulse.
CLEAR and PRESET are independent of the
clock and accomplished by a low setting on the
appropriate input.
It is ideal for low power applications mantaining
high speed operation similar to equivalent Bipolar
Schottky TTL.
All
inputs and
outputs
are
equipped with
protection circuits against static discharge, giving
them 2KV ESD immunity and transient excess
voltage.
PIN CONNECTION AND IEC LOGIC SYMBOLS
ORDER CODES :
74AC74B
74AC74M
M
(Micro Package)
B
(Plastic Package)
1/11
INPUT AND OUTPUT EQUIVALENT CIRCUIT
LOGIC DIAGRAMS
PIN DESCRIPTION
PIN No
SYMBOL
NAME AND F UNCTIO N
1, 13
1CLR,
2CLR
Asyncronous Reset -
Direct Input
2, 12
1D, 2D
Data Inputs
3, 11
1CK, 2CK
Clock Input
(LOW-to-HIGH, Edge-
Triggered)
4, 10
1PR, 2PR
Asyncronous Set - Direct
Input
5, 9
1Q, 2Q
True Flip-Flop Outputs
6, 8
1Q, 2Q
Complement Flip-Flop
Outputs
7
GND
Ground (0V)
14
V
CC
Positive Supply Voltage
TRUTH TABLE
INPUTS
OUT PUT S
F UNCT IO N
CLR
PR
D
CK
Q
Q
L
H
X
X
L
H
CLEAR
H
L
X
X
H
L
PRESET
L
L
X
X
H
H
H
H
L
L
H
H
H
H
H
L
H
H
X
Q
n
Q
n
NO CHANGE
X: Don't Care
This logic diagram has not be used to estimate propagation delays
74AC74
2/11
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Val ue
Uni t
V
CC
Supply Voltage
-0.5 to +7
V
V
I
DC Input Voltage
-0.5 to V
CC
+ 0.5
V
V
O
DC Output Voltage
-0.5 to V
CC
+ 0.5
V
I
IK
DC Input Diode Current
20
mA
I
OK
DC Output Diode Current
20
mA
I
O
DC Output Current
50
mA
I
CC
or I
GND
DC V
CC
or Ground Current
200
mA
T
stg
Storage Temperature
-65 to +150
o
C
T
L
Lead Temperature (10 sec)
300
o
C
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
Value
Un it
V
CC
Supply Voltage
2 to 6
V
V
I
Input Voltage
0 to V
CC
V
V
O
Output Voltage
0 to V
CC
V
T
op
Operating Temperature:
-40 to +85
o
C
dt/dv
Input Rise and Fall Time V
CC
= 3.0, 4.5 or 5.5 V(note 1)
8
ns/V
1) V
IN
from 30% to 70% of V
CC
74AC74
3/11
DC SPECIFICATIONS
Symbol
Parameter
Test Con dition s
Value
Unit
V
CC
(V)
T
A
= 25
o
C
-40 to 85
o
C
Mi n.
Typ.
Max.
Min .
Max.
V
IH
High Level Input Voltage
3.0
V
O
= 0.1 V or
V
CC
- 0.1 V
2.1
1.5
2.1
V
4.5
3.15
2.25
3.15
5.5
3.85
2.75
3.85
V
IL
Low Level Input Voltage
3.0
V
O
= 0.1 V or
V
CC
- 0.1 V
1.5
0.9
0.9
V
4.5
2.25
1.35
1.35
5.5
2.75
1.65
1.65
V
OH
High Level Output
Voltage
3.0
V
I
(*)
=
V
IH
or
V
IL
I
O
=-50
A
2.9
2.99
2.9
V
4.5
I
O
=-50
A
4.4
4.49
4.4
5.5
I
O
=-50
A
5.4
5.49
5.4
3.0
I
O
=-12 mA
2.56
2.46
4.5
I
O
=-24 mA
3.86
3.76
5.5
I
O
=-24 mA
4.86
4.76
V
OL
Low Level Output
Voltage
3.0
V
I
(*)
=
V
IH
or
V
IL
I
O
=50
A
0.002
0.1
0.1
V
4.5
I
O
=50
A
0.001
0.1
0.1
5.5
I
O
=50
A
0.001
0.1
0.1
3.0
I
O
=12 mA
0.36
0.44
4.5
I
O
=24 mA
0.36
0.44
5.5
I
O
=24 mA
0.36
0.44
I
I
Input Leakage Current
5.5
V
I
= V
CC
or GND
0.1
1
A
I
CC
Quiescent Supply
Current
5.5
V
I
= V
CC
or GND
4
40
A
I
OLD
Dynamic Output Current
(note 1, 2)
5.5
V
OLD
= 1.65 V max
75
mA
I
OHD
V
OHD
= 3.85 V min
-75
mA
1) Maximum test duration 2ms, one output loaded at time
2) Incident wave switching is guaranteed on transmission lines with impedances as low as 50
.
(*) All outputs loaded.
74AC74
4/11
CAPACITIVE CHARACTERISTICS
Symbol
Parameter
Test Con dition s
Value
Unit
V
CC
(V)
T
A
= 25
o
C
-40 to 85
o
C
Mi n.
Typ.
Max.
Min .
Max.
C
IN
Input Capacitance
5.0
4
pF
C
PD
Power Dissipation
Capacitance (note 1)
5.0
35
pF
1) C
PD
is defined as the value of the IC's internal equivalent capacitance which is calculated from the operating current consumption without load. (Refer to
Test Circuit). Average operating current can be obtained by the following equation. I
CC
(opr) = C
PD
V
CC
f
IN
+ I
CC
/n (per circuit)
AC ELECTRICAL CHARACTERISTICS (C
L
= 50 pF, R
L
= 500
, Input t
r
= t
f
=3 ns)
Symbol
Parameter
T est Cond iti on
Value
Unit
V
CC
(V)
T
A
= 25
o
C
-40 to 85
o
C
Mi n.
Typ.
Max.
Min .
Max.
t
PLH
t
PHL
Propagation Delay Time
CK to Q
3.3
(*)
7
13
14
ns
5.0
(**)
5
10
11
t
PLH
t
PHL
Propagation Delay Time
PR or CLR to Q
3.3
(*)
6
12
13
ns
5.0
(**)
4.5
9
10
t
w
Pulse Width HIGH or
LOW, CK or PR or CLR
3.3
(*)
1.5
5
7
ns
5.0
(**)
1.5
4
5
t
s
Setup Time D to CK
HIGH or LOW
3.3
(*)
-0.2
4
4
ns
5.0
(**)
-0.2
3
3
t
h
Hold Time D to CK
HIGH or LOW
3.3
(*)
0.2
2
3
ns
5.0
(**)
0.2
2
3
t
REM
Removal Time
PR or CLR to CK
3.3
(*)
-1
1
1
ns
5.0
(**)
-0.7
1
1
f
MAX
Maximum Clock
Frequency
3.3
(*)
100
300
90
MHz
5.0
(**)
140
300
130
(*) Voltage range is 3.3V
0.3V
(**) Voltage range is 5V
0.5V
74AC74
5/11
TEST CIRCUIT
C
L
= 50 pF or equivalent (includes jig and probe capacitance)
R
L
= R
1
= 500
or equivalent
R
T
= Z
OUT
of pulse generator (typically 50
)
WAVEFORM 1: PROPAGATION DELAYS, SETUP AND HOLD TIMES (f=1MHz; 50% duty cycle)
74AC74
6/11
WAVEFORM 2: PROPAGATION DELAYS (f=1MHz; 50% duty cycle)
74AC74
7/11
WAVEFORM 3: RECOVERY TIMES (f=1MHz; 50% duty cycle)
WAVEFORM 3: PULSE WIDTH
74AC74
8/11
DIM.
mm
inch
MIN.
TYP.
MAX.
MIN.
TYP.
MAX.
a1
0.51
0.020
B
1.39
1.65
0.055
0.065
b
0.5
0.020
b1
0.25
0.010
D
20
0.787
E
8.5
0.335
e
2.54
0.100
e3
15.24
0.600
F
7.1
0.280
I
5.1
0.201
L
3.3
0.130
Z
1.27
2.54
0.050
0.100
P001A
Plastic DIP14 MECHANICAL DATA
74AC74
9/11
DIM.
mm
inch
MIN.
TYP.
MAX.
MIN.
TYP.
MAX.
A
1.75
0.068
a1
0.1
0.2
0.003
0.007
a2
1.65
0.064
b
0.35
0.46
0.013
0.018
b1
0.19
0.25
0.007
0.010
C
0.5
0.019
c1
45 (typ.)
D
8.55
8.75
0.336
0.344
E
5.8
6.2
0.228
0.244
e
1.27
0.050
e3
7.62
0.300
F
3.8
4.0
0.149
0.157
G
4.6
5.3
0.181
0.208
L
0.5
1.27
0.019
0.050
M
0.68
0.026
S
8 (max.)
P013G
SO14 MECHANICAL DATA
74AC74
10/11
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsability for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may results from its use. No
license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned
in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.
SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express
written approval of SGS-THOMSON Microelectonics.
1997 SGS-THOMSON Microelectronics - Printed in Italy - All Rights Reserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
Australia - Brazil - Canada - China - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands -
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.
74AC74
11/11
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