SGS Thomson Microelectronics M74HC237 Datasheet
.HIGH SPEED
tPD= 12 ns(TYP.) at VCC=5V
.LOWPOWERDISSIPATION
ICC=4µA(MAX.) AT TA=25°C
.HIGH NOISEIMMUNITY
V
NIH=VNIL
=28%VCC(MIN.)
.OUTPUT DRIVE CAPABILITY
10 LSTTL LOADS
.SYMMETRICALOUTPUT IMPEDANCE
IOH =IOL= 4 mA(MIN.)
.BALANCEDPROPAGATION DELAYS
t
PLH=tPHL
.WIDE OPERATINGVOLTAGE RANGE
VCC(OPR)= 2 V TO6 V
.PIN ANDFUNCTION COMPATIBLE
WITH 54/74LS237
M54HC237
M74HC237
3 TO8 LINE DECODER LATCH
B1R
(PlasticPackage)
M1R
(MicroPackage)
ORDER CODES :
M54HC 237F1R M74H C237M1R
M74HC 237B1R M74HC2 37C1R
F1R
(CeramicPackage)
C1R
(Chip Carrier)
DESCRIPTION
The M54/74HC237 is a high speed CMOS 3 TO 8
LINE DECODER LATCH fabricated in silicon gate
C2MOStechnology.
It has the same high speed performance of LSTTL
combined with true CMOS low power consumption.
WhenGL goes from low to high, the address present
atthe select inputs (A, B, C) isstored in thelatches.
Aslong as GLremains highno address changes will
be recognized. Output enable controls, G1 and G2
control the state of the outputs independantly of the
selector latch-enableinputs. Alloftheoutputs are low
unless G1is high andG2is low. The ’HC237 is ideally
suited for the implementation of glitch-free decoders
in stored-address applications in bus oriented systems. Allinputs areequipped with protection circuits
againststatic discharge andtransient excessvoltage.
NC =
No Internal
Connection
PIN CONNECTIONS(top view)
October 1992
1/11
M54/M74HC237
INPUT AND OUTPUT EQUIVALENT CIRCUIT
IEC LOGIC SYMBOLS
PIN DESCRIPTION
PIN No SYMBOL NAME AND FUNCTION
1, 2, 3 A, B, C Data Inputs
4 GL Latch Enable Input
(Active LOW)
5 G2 Data Enable Input
(Active LOW)
6 G1 Data Enable Input
(Active HIGH)
15, 14, 13,
12, 11, 10, 9,
7
8 GND Ground (0V)
16 V
Y0 to Y7 Decoder Outputs
CC
Positive Supply Voltage
TRUTH TABLE
INPUTS
ENABLE SELECT
GLG2G1CBAY0Y1Y2Y3Y4Y5Y6Y7
XXLXXXLLLLLLLL
XHXXXXLLLLLLLL
LLHLLLHLLLLLLL
LLHLLHLHLLLLLL
LLHLHLLLHLLLLL
LLHLHHLLLHLLLL
LLHHLLLLLLHLLL
LLHHLHLLLLLHLL
LLHHHLLLLLLLHL
LLHHHHLLLLLLLH
H L H X X X OUTPUT CORRESPONDING TO STORED ADDRESS, H: ALL OTHERS, L
X: Don’t Care
2/11
OUTPUS
LOGIC DIAGRAM
M54/M74HC237
ABSOLU TE M AXI MU 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
AbsoluteMaximumRatingsarethose valuesbeyond whichdamage to thedevice mayoccur.Functional operation under these conditionisnotimplied.
(*)500 mW: ≅ 65oC derateto300 mWby 10mW/oC: 65oCto85oC
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 (10 sec) 300
L
o
C
o
C
3/11
M54/M74HC237
RECO MM ENDED O PERAT IN G CONDI TIONS
Symbol Parameter Value Unit
V
V
V
T
t
r,tf
DC SPECIFICATIO NS
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
T
High Level Input
Voltage
=25oC
V
(V)
CC
A
54HC and 74HC
Min. Typ. Max. Min. Max. Min. Max.
2.0 1.5 1.5 1.5
4.5 3.15 3.15 3.15
-40 to 85oC
74HC
-55 to 125oC
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 4 40 80 µA
Current
54HC
V
V
o
C
o
C
Unit
V
V
V
V
4/11
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