M54HC237
M74HC237
October 1992
3 TO 8 LINE DECODER LATCH
B1R
(Plastic Package)
ORDER CODES :
M54HC237F1R
M74HC237M1R
M74HC237B1R
M74HC237C1R
F1R
(Ceramic Package)
M1R
(Micro Package)
C1R
(Chip Carrier)
PIN CONNECTIONS (top view)
NC =
No Internal
Connection
.
HIGH SPEED
t
PD
= 12 ns (TYP.) at V
CC
= 5 V
.
LOW POWER DISSIPATION
I
CC
= 4
A (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 54/74LS237
The M54/74HC237 is a high speed CMOS 3 TO 8
LINE DECODER LATCH fabricated in silicon gate
C
2
MOS technology.
It has the same high speed performance of LSTTL
combined with true CMOS low power consumption.
When GL goes from low to high, the address present
at the select inputs (A, B, C) is stored in the latches.
As long as GL remains high no address changes will
be recognized. Output enable controls, G1 and G2
control the state of the outputs independantly of the
select or latch-enable inputs. All of the outputs are low
unless G1 is high and G2 is low. The 'HC237 is ideally
suited for the implementation of glitch-free decoders
in stored-address applications in bus oriented sys-
tems. All inputs are equipped with protection circuits
against static discharge and transient excess voltage.
DESCRIPTION
1/11
TRUTH TABLE
INPUTS
OUTPUS
ENABLE
SELECT
GL
G2
G1
C
B
A
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
X
X
L
X
X
X
L
L
L
L
L
L
L
L
X
H
X
X
X
X
L
L
L
L
L
L
L
L
L
L
H
L
L
L
H
L
L
L
L
L
L
L
L
L
H
L
L
H
L
H
L
L
L
L
L
L
L
L
H
L
H
L
L
L
H
L
L
L
L
L
L
L
H
L
H
H
L
L
L
H
L
L
L
L
L
L
H
H
L
L
L
L
L
L
H
L
L
L
L
L
H
H
L
H
L
L
L
L
L
H
L
L
L
L
H
H
H
L
L
L
L
L
L
L
H
L
L
L
H
H
H
H
L
L
L
L
L
L
L
H
H
L
H
X
X
X
OUTPUT CORRESPONDING TO STORED ADDRESS, H: ALL OTHERS, L
X: Don't Care
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
Y0 to Y7
Decoder Outputs
8
GND
Ground (0V)
16
V
CC
Positive Supply Voltage
IEC LOGIC SYMBOLS
INPUT AND OUTPUT EQUIVALENT CIRCUIT
M54/M74HC237
2/11
LOGIC DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
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 Source Sink Current Per Output Pin
25
mA
I
CC
or I
GND
DC V
CC
or Ground Current
50
mA
P
D
Power Dissipation
500 (*)
mW
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.
(*) 500 mW:
65
o
C derate to 300 mW by 10mW/
o
C: 65
o
C to 85
o
C
M54/M74HC237
3/11
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
Value
Unit
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: M54HC Series
M74HC Series
-55 to +125
-40 to +85
o
C
o
C
t
r
, t
f
Input Rise and Fall Time
V
CC
= 2 V
0 to 1000
ns
V
CC
= 4.5 V
0 to 500
V
CC
= 6 V
0 to 400
DC SPECIFICATIONS
Symbol
Parameter
Test Conditions
Value
Unit
V
CC
(V)
T
A
= 25
o
C
54HC and 74HC
-40 to 85
o
C
74HC
-55 to 125
o
C
54HC
Min.
Typ.
Max.
Min.
Max.
Min.
Max.
V
IH
High Level Input
Voltage
2.0
1.5
1.5
1.5
V
4.5
3.15
3.15
3.15
6.0
4.2
4.2
4.2
V
IL
Low Level Input
Voltage
2.0
0.5
0.5
0.5
V
4.5
1.35
1.35
1.35
6.0
1.8
1.8
1.8
V
OH
High Level
Output Voltage
2.0
V
I
=
V
IH
or
V
IL
I
O
=-20
A
1.9
2.0
1.9
1.9
V
4.5
4.4
4.5
4.4
4.4
6.0
5.9
6.0
5.9
5.9
4.5
I
O
=-4.0 mA
4.18
4.31
4.13
4.10
6.0
I
O
=-5.2 mA
5.68
5.8
5.63
5.60
V
OL
Low Level Output
Voltage
2.0
V
I
=
V
IH
or
V
IL
I
O
= 20
A
0.0
0.1
0.1
0.1
V
4.5
0.0
0.1
0.1
0.1
6.0
0.0
0.1
0.1
0.1
4.5
I
O
= 4.0 mA
0.17
0.26
0.33
0.40
6.0
I
O
= 5.2 mA
0.18
0.26
0.33
0.40
I
I
Input Leakage
Current
6.0
V
I
= V
CC
or GND
0.1
1
1
A
I
CC
Quiescent Supply
Current
6.0
V
I
= V
CC
or GND
4
40
80
A
M54/M74HC237
4/11
AC ELECTRICAL CHARACTERISTICS (C
L
= 50 pF, Input t
r
= t
f
= 6 ns)
Symbol
Parameter
Test Conditions
Value
Unit
V
CC
(V)
T
A
= 25
o
C
54HC and 74HC
-40 to 85
o
C
74HC
-55 to 125
o
C
54HC
Min.
Typ.
Max.
Min.
Max.
Min.
Max.
t
TLH
t
THL
Output Transition
Time
2.0
30
75
95
115
ns
4.5
8
15
19
22
6.0
7
13
16
19
t
PLH
t
PHL
Propagation
Delay Time
(A, B, C - Y)
2.0
60
180
225
270
ns
4.5
19
36
45
54
6.0
16
31
38
46
t
PLH
t
PHL
Propagation
Delay Time
(G1 - Y)
2.0
45
140
175
210
ns
4.5
15
28
35
42
6.0
13
24
30
36
t
PLH
t
PHL
Propagation
Delay Time
(G2 - Y)
2.0
45
140
175
210
ns
4.5
15
28
35
42
6.0
13
24
30
36
t
PLH
t
PHL
Propagation
Delay Time
(GL - Y)
2.0
65
190
240
285
ns
4.5
21
38
48
57
6.0
18
32
41
48
t
W(L)
Minimum Pulse
Width
(GL)
2.0
10
75
95
110
ns
4.5
6
15
19
22
6.0
6
13
16
19
t
s
Minimum Set-up
Time
(A, B, C - GL)
2.0
12
50
65
75
ns
4.5
3
10
13
15
6.0
2
9
11
13
t
h
Minimum Hold
Time
(A, B, C - GL)
2.0
25
30
40
ns
4.5
5
6
8
6.0
5
5
7
C
IN
Input Capacitance
5
10
10
10
pF
C
PD
(*)
Power Dissipation
Capacitance
52
pF
(*) C
PD
is defined as the value of the IC's internal equivalent capacitance which is calculated from the operating current consumption without load.
SWITCHING CHARACTERISTICS TEST WAVEFORM
M54/M74HC237
5/11
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