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Número de pieza | M74HC238 | |
Descripción | 3 TO 8 LINE DECODER | |
Fabricantes | ST Microelectronics | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de M74HC238 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
No Preview Available ! . HIGH SPEED
tPD = 14 ns (TYP.) AT VCC = 5 V
. LOW POWER DISSIPATION
ICC = 4 µA (MAX.) AT TA = 25 °C
. HIGH NOISE IMMUNITY
VNIH = VNIL = 28 % VCC (MIN.)
. OUTPUT DRIVE CAPABILITY
10 LSTTL LOADS
. SYMMETRICAL OUTPUT IMPEDANCE
|IOH| = IOL = 4 mA (MIN.)
. BALANCED PROPAGATION DELAYS
tPLH = tPHL
. WIDE OPERATING VOLTAGE RANGE
VCC (OPR) = 2 V TO 6 V
. PIN AND FUNCTION COMPATIBLE
WITH 54/74LS238
M54HC238
M74HC238
3 TO 8 LINE DECODER
B1R
(Plastic Package)
F1R
(Ceramic Package)
M 1R
(Micro Package)
C1R
(Chip Carrier)
ORDER CODES :
M 54HC 23 8F 1R
M 74H C2 38 M1 R
M 74HC 23 8B 1R
M 74H C2 38 C1 R
PIN CONNECTIONS (top view)
DESCRIPTION
The M54/74HC238 is a high speed CMOS 3 to 8 line
decoder fabricated in silicon gate C2MOS technology.
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 outputs will go high. Enable
input G1 is held ”Low” or either G2A or G2B is held
”High” decoding function is inhibited and all the 8 out-
puts go low. Three enable inputs are provided to ease
cascade connection and application of this address
decoder in memory systems.
All inputs are equipped with protection circuits against
static discharge and transient excess voltage.
NC =
No Internal
Connection
October 1993
1/10
1 page M54/M74HC238
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
50 150 190 225
17 30 38 45 ns
15 26 32 38
tPLH Propagation
tPHL Delay Time
(G1 - Y)
2.0
4.5
6.0
50 150 190 225
17 30 38 45 ns
15 26 32 38
tPLH Propagation
tPHL Delay Time
(G2 - Y)
2.0
4.5
6.0
50 150 190 225
17 30 38 45 ns
15 26 32 38
CIN
CPD (*)
Input Capacitance
Power Dissipation
Capacitance
5 10 10 10 pF
53 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 CHARACTERISTICSTEST.
5/10
5 Page |
Páginas | Total 10 Páginas | |
PDF Descargar | [ Datasheet M74HC238.PDF ] |
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