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PDF M74HCT137 Data sheet ( Hoja de datos )
| Número de pieza | M74HCT137 | |
| Descripción | 3 TO 8 LINE DECODER/LATCH INVERTING | |
| Fabricantes | ST Microelectronics | |
| Logotipo |  |
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M54HCT137
M74HCT137
3 TO 8 LINE DECODER/LATCH (INVERTING)
. HIGH SPEED
tPD = 17 ns (TYP.) AT VCC = 5 V
. LOW POWER DISSIPATION
ICC = 4 µA (MAX.) AT TA = 25 °C
. COMPATIBLE WITH TTL OUTPUTS
VIH = 2V (MIN.) VIL = 0.8V (MAX)
. OUTPUT DRIVE CAPABILITY
10 LSTTL LOADS
. SYMMETRICAL OUTPUT IMPEDANCE
IOH = IOL = 4 mA (MIN.)
. BALANCED PROPAGATION DELAYS
tPLH = tPHL
. PIN AND FUNCTION COMPATIBLE
WITH 54/74LS137
DESCRIPTION
The M54/74HCT137 is a high speed CMOS3TO8LINE
DECODER/LATCH (INVERTING) fabricated in silicon
gateC2MOStechnology. Ithas the samehigh speed per-
formance ofLSTTL combined with trueCMOSlow power
consumption. This device is a 3 to 8 line decoder with lat-
ches onthe three address inputs. When GLgoes from low
to high, the address present at the select inputs (A, B and
C) is stored in the latches. As long as GLremains high no
address changes will be recognized. Output enable pins
G1 and G2, control the state of the outputs independently
ofthe select orlatch-enable inputs. All theoutputs are high
unless G1 is high and G2 is low. The HC137 is ideally
suited for the implementation of glitch-free decoders in
stored-address applications in bus oriented systems. All
inputs are equipped with protection circuits against static
discharge and transient excess voltage.This integrated
circuit has input and output characteristics that are fully
compatible with 54/74 LSTTL logic families. M54/74HCT
devices aredesigned todirectly interfaceHSC2MOS sys-
tems with TTL and NMOS components. They are also
plug in replacements for LSTTL devices giving a re-
duction of power consumption.
B1R
(Plastic Package)
F1R
(Ceramic Package)
M 1R
(Micro Package)
C1R
(Chip Carrier)
ORDER CODES :
M54HCT137F1R M74HCT137M1R
M74HCT137B1R M74HCT137C1R
PIN CONNECTIONS (top view)
INPUT AND OUTPUT EQUIVALENT CIRCUIT
February 1993
NC =
No Internal
Connection
1/12
1 page  
M54/M74HCT137
AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, Input tr = tf = 6 ns)
Symbol
Parameter
Test Conditions
VCC
(V)
TA = 25 oC
54HC and 74HC
Min. Typ. Max.
Value
-40 to 85 oC
74HC
Min. Max.
-55 to 125 oC
54HC
Min. Max.
Unit
tTLH Output Transition 4.5
tTHL Time
tPLH Propagation
tPHL Delay Time
(G1 - Y)
4.5
8 15 19 22 ns
17 27 34 41
ns
tPLH Propagation
tPHL Delay Time
(G2 - Y)
4.5
18 28 35 42
ns
tPLH Propagation
tPHL Delay Time
(GL - Y)
4.5
25 39 49 59
ns
tPLH Propagation
tPHL Delay Time
(A, B, C - Y)
4.5
24 37 46 56
ns
tW(L) Minimum Pulse
Width
(GL)
4.5
8 15 19 22
ns
ts Minimum Set-up 4.5
Time
(A, B, C - GL)
568
ns
th Minimum Hold 4.5
Time
(A, B, C - GL)
568
ns
CIN
CPD (*)
Input Capacitance
Power Dissipation
Capacitance
5 10 10 10 pF
58 pF
(*) CPD 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. ICC(opr) = CPD •VCC •fIN + ICC
5/12
5 Page 
DIM.
A
B
D
d1
d2
E
e
e3
F
G
M
M1
M54/M74HCT137
MIN.
9.78
8.89
4.2
7.37
PLCC20 MECHANICAL DATA
mm
TYP.
2.54
0.56
1.27
5.08
0.38
1.27
1.14
MAX.
10.03
9.04
4.57
MIN.
0.385
0.350
0.165
8.38 0.290
0.101
inch
TYP.
0.100
0.022
0.050
0.200
0.015
0.050
0.045
MAX.
0.395
0.356
0.180
0.330
0.004
P027A
11/12
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet M74HCT137.PDF ] | |
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