M54HC279
M74HC279
QUAD S - R LATCH
.
.
.
.
.
.
.
.
HIGH SPEED
t
PD
= 12 ns (TYP.) AT V
CC
= 5 V
LOW POWER DISSIPATION
I
CC
= 2
µA
(MAX.) AT T
A
= 25
°C
HIGH NOISE IMMUNITY
V
NIH
= V
NIL
= 28 % V
CC
(MIN.)
OUTPUT DRIVE CAPABILITY
10 LSTTL LOADS
SYMMETRICAL OUTPUT IMPEDANCE
I
OH
= I
OL
= 4 mA (MIN.)
BALANCED PROPAGATION DELAYS
t
PLH
= t
PHL
WIDE OPERATING VOLTAGE RANGE
V
CC
(OPR) = 2 V TO 6 V
PIN AND FUNCTION COMPATIBLE
WITH 54/74LS279
B1R
(Plastic Package)
F1R
(Ceramic Package)
M1R
(Micro Package)
C1R
(Chip Carrier)
ORDER CODES :
M54HC279F1R
M74HC279M1R
M74HC279B1R
M74HC279C1R
PIN CONNECTIONS
(top view)
DESCRIPTION
The M54/74HC279 is a high speed CMOS QUAD S
- R LATCH fabricated in silicon gate C
2
MOS tech-
nology. It has the same high speed performance of
LSTTL combined with true CMOS low power con-
sumption.
All inputs are equipped with protection circuits
against static discharge and transient excess volt-
age.
INPUT AND OUTPUT EQUIVALENT CIRCUIT
NC =
No Internal
Connection
March 1993
1/10
M54/M74HC279
PIN DESCRIPTION
PIN No
SYMBOL
1, 5, 10. 14 1R to 4R
2, 3, 6, 11, 1S1, 1S2, 2S,
12, 15
3S1, 3S2, 4S
4, 7, 9, 13
1Q to 4Q
8
GND
16
V
CC
NAME AND FUNCTION
Reset Inputs (Active LOW)
Set Inputs (Active LOW)
Outputs
Ground (0V)
Positive Supply Voltage
IEC LOGIC SYMBOL
TRUTH TABLE
S #
H
L
H
L
R
H
H
L
L
Q
Q0
H
L
H
NOTE: Q0 = THE LEVEL OF Q BEFORE THE INDICRTED INPUT
CONDITION WAS ESTABLISHED.
#
FOR LATCHES WITH DOUBLE S INPUT:
H = BOTH S INPUTS HIGH
L = ONE OF BOTH INPUTS LOW
LOGIC DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Symbol
V
CC
V
I
V
O
I
IK
I
OK
I
O
I
CC
or I
GND
P
D
T
stg
T
L
Supply Voltage
DC Input Voltage
DC Output Voltage
DC Input Diode Current
DC Output Diode Current
DC Output Source Sink Current Per Output Pin
DC V
CC
or Ground Current
Power Dissipation
Storage Temperature
Lead Temperature (10 sec)
Parameter
Value
-0.5 to +7
-0.5 to V
CC
+ 0.5
-0.5 to V
CC
+ 0.5
±
20
±
20
±
25
±
50
500 (*)
-65 to +150
300
Unit
V
V
V
mA
mA
mA
mA
mW
o
o
C
C
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition isnotimplied.
(*) 500 mW:
≅
65
o
C derate to 300 mW by 10mW/
o
C: 65
o
C to 85
o
C
2/10
M54/M74HC279
RECOMMENDED OPERATING CONDITIONS
Symbol
V
CC
V
I
V
O
T
op
t
r
, t
f
Supply Voltage
Input Voltage
Output Voltage
Operating Temperature:
M54HC
Series
M74HC
Series
Input Rise and Fall Time
Parameter
Value
2 to 6
0 to V
CC
0 to V
CC
-55 to +125
-40 to +85
0 to 1000
0 to 500
0 to 400
Unit
V
V
V
C
C
ns
o
o
V
CC
= 2 V
V
CC
= 4.5 V
V
CC
= 6 V
DC SPECIFICATIONS
Test Conditions
Symbol
Parameter
V
CC
(V)
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
4.5
6.0
V
OL
Low Level Output
Voltage
2.0
4.5
6.0
4.5
6.0
I
I
I
CC
Input Leakage
Current
Quiescent Supply
Current
6.0
6.0
1.9
4.4
5.9
4.18
5.68
2.0
4.5
6.0
4.31
5.8
0.0
0.0
0.0
0.17
0.18
0.1
0.1
0.1
0.26
0.26
±0.1
2
T
A
= 25 C
54HC and 74HC
Min.
1.5
3.15
4.2
0.5
1.35
1.8
V
I
=
I
O
=-20
µA
V
IH
or
V
IL
I
O
=-4.0 mA
I
O
=-5.2 mA
V
I
=
I
O
= 20
µA
V
IH
or
V
IL
I
O
= 4.0 mA
I
O
= 5.2 mA
V
I
= V
CC
or GND
V
I
= V
CC
or GND
1.9
4.4
5.9
4.13
5.63
0.1
0.1
0.1
0.33
0.33
±1
20
Typ.
Max.
o
Value
-40 to 85
o
C -55 to 125
o
C
74HC
54HC
Min.
1.5
3.15
4.2
0.5
1.35
1.8
1.9
4.4
5.9
4.10
5.60
0.1
0.1
0.1
0.40
0.40
±1
40
µA
µA
V
V
Max.
Min.
1.5
3.15
4.2
0.5
1.35
1.8
V
Max.
V
Unit
V
IH
High Level Input
Voltage
Low Level Input
Voltage
High Level
Output Voltage
V
IL
V
OH
3/10
M54/M74HC279
AC ELECTRICAL CHARACTERISTICS
(C
L
= 50 pF, Input t
r
= t
f
= 6 ns)
Test Conditions
Symbol
Parameter
V
CC
(V)
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
T
A
= 25 C
54HC and 74HC
Min.
Typ.
30
8
7
45
15
13
38
12
10
42
14
12
5
18
Max.
75
15
13
130
26
22
100
20
17
120
24
20
10
o
Value
-40 to 85
o
C -55 to 125
o
C
74HC
54HC
Min.
Max.
95
19
16
165
33
28
125
25
21
150
30
26
10
Min.
Max.
110
22
19
195
39
33
150
30
26
180
36
31
10
Unit
t
TLH
t
THL
t
PLH
t
PHL
t
PLH
t
PHL
t
PHL
Output Transition
Time
Propagation
Delay Time
(S1, S2 - Q)
Propagation
Delay Time
(S - Q)
Propagation
Delay Time
(R - Q)
Input Capacitance
Power Dissipation
Capacitance
ns
ns
ns
ns
pF
pF
C
IN
C
PD
(*)
(*) 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 operting current can be obtained by the following equation. I
CC
(opr) = C
PD
•V
CC
•f
IN
+ I
CC
SWITCHING CHARACTERISTICS TEST WAVEFORM
4/10
M54/M74HC279
TEST CIRCUIT I
CC
(Opr.)
5/10
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