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PDF M54HC138 Data sheet ( Hoja de datos )
| Número de pieza | M54HC138 | |
| Descripción | 3 TO 8 LINE DECODER INVERTING | |
| Fabricantes | ST Microelectronics | |
| Logotipo |  |
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M54HC138
M74HC138
3 TO 8 LINE DECODER (INVERTING)
. HIGH SPEED
tPD = 16 ns (TYP.) AT VCC = 5 V
. LOW POWER DISSIPATION
ICC = 4 µA AT TA = 25 °C
. OUTPUT DRIVE CAPABILITY
10 LSTTL LOADS
. BALANCED PROPAGATION DELAYS
tPLH = tPHL
. SYMMETRICAL OUTPUT IMPEDANCE
|IOH| = IOL
. HIGH NOISE IMMUNITY
VNIH = VNIL = 28 % VCC (MIN.)
. WIDE OPERATING VOLTAGE RANGE
VCC (OPR) = 2 V TO 6 V
. PIN AND FUNCTION COMPATIBLE
WITH 54/74LS138
DESCRIPTION
B1R
(Plastic Package)
F1R
(Ceramic Package)
M 1R
(Micro Package)
C1R
(Chip Carrier)
ORDER CODES :
M 54HC 13 8F 1R
M 74H C1 38 M1 R
M 74HC 13 8B 1R
M 74H C1 38 C1 R
The M54/74HC138 is a high speed CMOS 3 TO 8
LINE DECODER fabricated in silicon gate C2MOS
technology.
PIN CONNECTIONS (top view)
It has the same high speed performance of LSTTL
combined with true CMOS low power consumption.
If the device is enabled, 3 binary select inputs (A, B
and C) determine which one of the outputs will go
low. If enable input G1 is held low or either G2A or
G2B is held high, the decoding function is inhibited
and all the 8 outputs go high.
Three enable inputs are provided to ease cascade
connection and application of address decoders for
memory systems. All inputs are equipped with pro-
tection circuits against static discharge and tran-
sient excess voltage.
INPUT AND OUTPUT EQUIVALENT CIRCUIT
October 1992
NC =
No Internal
Connection
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1 page  
M54/M74HC138
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 2.0
tTHL Time
4.5
30 75
8 15
95 110
19 22 ns
6.0 7 13 16 19
tPLH Propagation
tPHL Delay Time
(A, B, C - Y)
2.0
4.5
6.0
60 125 155 190
15 25 31 38 ns
13 21 26 32
tPLH Propagation
tPHL Delay Time
(G, G - Y)
2.0
4.5
6.0
56 120 150 180
14 24 30 36 ns
12 20 26 31
CIN Input Capacitance
5 10 10 10 pF
CPD (*) Power Dissipation
Capacitance
47
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
SWITCHING CHARACTERISTICS TEST WAVEFORM
TEST CIRCUIT ICC (Opr.)
INPUT WAVEFORM IS THE SAME
AS THAT IN CASE OF SWITCHING
CHARACTERISTICS TEST.
5/10
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| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet M54HC138.PDF ] | |
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