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PDF M74HC237 Data sheet ( Hoja de datos )
| Número de pieza | M74HC237 | |
| Descripción | 3 TO 8 LINE DECODER LATCH | |
| Fabricantes | ST Microelectronics | |
| Logotipo |  |
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M74HC237
3 TO 8 LINE DECODER LATCH
s HIGH SPEED:
tPD = 16ns (TYP.) at VCC = 6V
s LOW POWER DISSIPATION:
ICC = 4µA(MAX.) at TA=25°C
s HIGH NOISE IMMUNITY:
)VNIH = VNIL = 28 % VCC (MIN.)
t(ss SYMMETRICAL OUTPUT IMPEDANCE:
|IOH| = IOL = 4mA (MIN)
ucs BALANCED PROPAGATION DELAYS:
dtPLH ≅ tPHL
ro )s WIDE OPERATING VOLTAGE RANGE:
P t(sVCC (OPR) = 2V to 6V
s PIN AND FUNCTION COMPATIBLE WITH
lete uc74 SERIES 237
so rodDESCRIPTION
b PThe M74HC237 is an high speed CMOS 3 TO 8
LINE DECODER fabricated with silicon gate
- O teC2MOS technology.
) leWhen GL goes from low to high, the address
t(s opresent at the select inputs (A, B, C) is stored in
sthe latches. As long as GL remains high no
c baddress changes will be recognized. Output
u Oenable controls, G1 and G2 control the state of the
d -outputs independently of the select or
DIP
SOP
TSSOP
ORDER CODES
PACKAGE
TUBE
DIP
SOP
TSSOP
M74HC237B1R
M74HC237M1R
T&R
M74HC237RM13TR
M74HC237TTR
latch-enable inputs. All of the outputs are low
unless G1 is high and G2 is low. The M74HC237
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.
OObbssoolleettee PPrrooduct(s)PIN CONNECTION AND IEC LOGIC SYMBOLS
July 2001
1/11
1 page  
M74HC237
AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, Input tr = tf = 6ns)
Test Condition
Value
Symbol
Parameter
VCC
(V)
TA = 25°C
-40 to 85°C -55 to 125°C Unit
Min. Typ. Max. Min. Max. Min. Max.
tTLH tTHL Output Transition
Time
2.0
4.5
30 75
8 15
95 110
19 22 ns
6.0 7 13 16 19
tPLH tPHL Propagation Delay
Time (A, B, C - Y)
2.0
4.5
60 180 225 270
19 36 45 54 ns
)tPLH tPHL Propagation Delay
Time (G1 - Y)
uct(stPLH tPHL Propagation Delay
Time (G2 - Y)
Prod t(s)tPLH tPHL Propagation Delay
Time (GL - Y)
lete ductW(L) Minimum Pulse
so roWidth (GL)
- Ob te Pts Minimum Set-up
Time (A, B, C - GL)
t(s) soleth Minimum Hold
uc ObTime (A, B, C - GL)
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
16 31 38 46
45 140 175 210
15 28 35 42 ns
13 24 30 36
45 140 175 210
15 28 35 42 ns
13 24 30 36
65 190 240 285
21 38 48 57 ns
18 32 41 48
10 75
95 110
6 15 19 22 ns
6 13 16 19
12 50 65 75
3 10 13 15 ns
29
11 13
25 30 40
5 6 8 ns
557
Prod t(s) -CAPACITIVE CHARACTERISTICS
te cTest Condition
Value
sole roduSymbol
Parameter
VCC
(V)
TA = 25°C
-40 to 85°C -55 to 125°C Unit
Min. Typ. Max. Min. Max. Min. Max.
b PCIN Input Capacitance 5.0
5 10 10 10 pF
O teCPD Power Dissipation
leCapacitance (note 5.0
1)
52
pF
so1) CPD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without
Obload.
5/11
5 Page 
M74HC237
OObbssoolleettee PPrroodduucctt((ss)) -- OObbssoolleettee PPrroodduucctt((ss))Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from
its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications
mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information
previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or
systems without express written approval of STMicroelectronics.
© The ST logo is a registered trademark of STMicroelectronics
© 2001 STMicroelectronics - Printed in Italy - All Rights Reserved
STMicroelectronics GROUP OF COMPANIES
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Singapore - Spain - Sweden - Switzerland - United Kingdom
© http://www.st.com
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