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M74HC238 반도체 회로 부품 판매점

3 TO 8 LINE DECODER



ST Microelectronics 로고
ST Microelectronics
M74HC238 데이터시트, 핀배열, 회로
. 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


M74HC238 데이터시트, 핀배열, 회로
M54/M74HC238
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
1, 2, 3
4, 5
6
15, 14, 13,
12, 11, 10, 9,
7
8
16
SYMBOL
A, B, C
G2A G2B
G1
Y0 to Y7
GND
VCC
NAME AND FUNCTION
Data Inputs
Enable Input (Active
LOW)
Data Enable Input
(Active HIGH)
Outputs
Ground (0V)
Positive Supply Voltage
IEC LOGIC SYMBOLS
TRUTH TABLE
INPUTS
ENABLE
SELECT
G2B G2A G1 C B A
OUTPUS
SELECTED
OUTPUT
Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7
XXLXXXL LL L L L L L
NONE
XHXXXXL L L L L L L L
NONE
HXXXXXL L L L L L L L
NONE
L LHL L LHLL L L L L L
Y0
L LHL LHLHL L L L L L
Y1
L LHLHL L LHL L L L L
Y2
L L HL HHL L L HL L L L
Y3
L L HHL L L L L LHL L L
Y4
L L HHL HL L L L LHL L
Y5
L L HHHL L L L L L LHL
Y6
L L HHHHL L L L L L LH
Y7
X: Don’t Care
2/10




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