ST M54HC279, M74HC279 User Manual
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.HIGH SPEED
tPD= 12 ns(TYP.) AT VCC=5V
.LOWPOWER DISSIPATION
ICC=2µA(MAX.) AT TA=25°C
.HIGH NOISE IMMUNITY
V
NIH=VNIL
=28%VCC(MIN.)
.OUTPUT DRIVE CAPABILITY
10 LSTTL LOADS
.SYMMETRICAL OUTPUT IMPEDANCE
IOH =IOL= 4 mA (MIN.)
.BALANCEDPROPAGATION DELAYS
t
PLH=tPHL
.WIDE OPERATING VOLTAGE RANGE
VCC(OPR)= 2 V TO 6 V
.PIN AND FUNCTION COMPATIBLE
WITH 54/74LS279
M54HC279
M74HC279
QUAD S - R LATCH
B1R
(PlasticPackage)
M1R
(MicroPackage)
ORDER CODES :
M54HC 279F1R M74H C279M1R
M74HC 279B1R M74HC2 79C1R
F1R
(CeramicPackage)
C1R
(Chip Carrier)
DESCRIPTION
The M54/74HC279 isahighspeedCMOSQUAD S
- R LATCH fabricated in silicon gate C2MOS technology. It has the samehigh speed performance of
LSTTL combined with true CMOS low power consumption.
All inputs are equipped with protection circuits
against static discharge and transient excess voltage.
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN CONNECTIONS(top view)
NC =
No Internal
Connection
March1993
1/10
M54/M74HC279
PIN DESCRIPTION
PIN No SYMBOL NAME AND FUNCTION
1, 5, 10. 14 1R to 4R Reset Inputs (ActiveLOW)
2, 3, 6, 11,
12, 15
1S1, 1S2, 2S,
3S1,3S2,4S
Set Inputs (Active LOW)
4, 7, 9, 13 1Q to 4Q Outputs
8 GND Ground (0V)
16 V
CC
Positive Supply Voltage
TRUTH TABLE
S# R Q
HHQ0
LHH
HLL
LLH
NOTE: Q0 = THE LEVELOF Q BEFORETHE INDICRTED INPUT
CONDITIONWAS ESTABLISHED.
# FOR LATCHESWITH DOUBLES INPUT:
H =BOTH S INPUTSHIGH
L = ONE OF BOTHINPUTS LOW
LOGI C DI AG RAM
IEC LOGIC SYMBOL
ABSOLU TE M AXIMU M R AT INGS
Symbol Parameter Value Unit
V
CC
V
V
O
I
IK
I
OK
I
O
I
or I
CC
P
D
T
stg
T
AbsoluteMaximumRatingsarethosevaluesbeyond whichdamage tothedevicemayoccur. Functional operationunder theseconditionisnotimplied.
(*)500 mW:≅ 65oC derate to300 mWby 10mW/oC: 65oCto85oC
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Supply Voltage -0.5 to +7 V
DC Input Voltage -0.5 to VCC+ 0.5 V
I
DC Output Voltage -0.5 to VCC+ 0.5 V
DC Input Diode Current ± 20 mA
DC Output Diode Current ± 20 mA
DC Output Source Sink Current Per Output Pin ± 25 mA
DC VCCor Ground Current ± 50 mA
GND
Power Dissipation 500 (*) mW
Storage Temperature -65 to +150
Lead Temperature (10sec) 300
L
o
C
o
C
M54/M74HC279
RECO MM ENDED OPERATIN G CO NDI TI O NS
Symbol Parameter Value Unit
V
V
V
T
t
r,tf
DC SPECIFICATIONS
Symbol Parameter
V
IH
V
V
OH
V
OL
I
I
CC
Supply Voltage 2 to 6 V
CC
Input Voltage 0 to V
I
Output Voltage 0 to V
O
Operating Temperature: M54HC Series
op
M74HC Series
CC
CC
-55 to +125
-40 to +85
Input Rise and Fall Time VCC= 2 V 0 to 1000 ns
V
= 4.5 V 0 to 500
CC
V
= 6 V 0 to 400
CC
Test Conditions Value
V
(V)
CC
=25oC
T
A
54HC and 74HC
-40 to 85oC
74HC
-55 to 125oC
Min. Typ. Max. Min. Max. Min. Max.
High Level Input
Voltage
2.0 1.5 1.5 1.5
4.5 3.15 3.15 3.15
6.0 4.2 4.2 4.2
Low Level Input
IL
Voltage
2.0 0.5 0.5 0.5
4.5 1.35 1.35 1.35
6.0 1.8 1.8 1.8
High Level
Output Voltage
Low Level Output
Voltage
Input Leakage
I
Current
Quiescent Supply
2.0
V
=
I
4.5 4.4 4.5 4.4 4.4
6.0 5.9 6.0 5.9 5.9
4.5 I
6.0 I
2.0
4.5 0.0 0.1 0.1 0.1
6.0 0.0 0.1 0.1 0.1
4.5 I
6.0 I
6.0
IO=-20 µA
V
IH
or
V
IL
=-4.0 mA 4.18 4.31 4.13 4.10
O
=-5.2 mA 5.68 5.8 5.63 5.60
O
V
=
I
IO=20µA
V
IH
or
V
IL
= 4.0 mA 0.17 0.26 0.33 0.40
O
= 5.2 mA 0.18 0.26 0.33 0.40
O
VI=VCCor GND ±0.1 ±1 ±1 µA
1.9 2.0 1.9 1.9
0.0 0.1 0.1 0.1
6.0 VI=VCCor GND 2 20 40 µA
Current
54HC
V
V
o
C
o
C
Unit
V
V
V
V
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