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M74HC237
3 TO 8 LINE DECODER LATCH
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HIGH SPEED: tPD = 16ns (TYP.) at VCC = 6V LOW POWER DISSIPATION: ICC = 4A(MAX.) at TA=25C HIGH NOISE IMMUNITY: VNIH = V NIL = 28 % VCC (MIN.) SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 4mA (MIN) BALANCED PROPAGATION DELAYS: tPLH tPHL WIDE OPERATING VOLTAGE RANGE: VCC (OPR) = 2V to 6V PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 237
DIP
SOP
TSSOP
ORDER CODES
PACKAGE DIP SOP TSSOP TUBE M74HC237B1R M74HC237M1R T&R M74HC237RM13TR M74HC237TTR
DESCRIPTION The M74HC237 is an high speed CMOS 3 TO 8 LINE DECODER fabricated with silicon gate C2MOS technology. When GL goes from low to high, the address present at the select inputs (A, B, C) is stored in the latches. As long as GL remains high no address changes will be recognized. Output enable controls, G1 and G2 control the state of the outputs independently of the select or
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.
PIN CONNECTION AND IEC LOGIC SYMBOLS
July 2001
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M74HC237
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 GL G2 G1 Y0 to Y7 NAME AND FUNCTION Data Inputs Latch Enable Input Data Enable Input (Active LOW) Data Enable Input (Active HIGH) Decoder Outputs
GND VCC
Ground (0V) Positive Supply Voltage
TRUTH TABLE
INPUTS OUTPUTS ENABLE GL X X L L L L L L L L H G2 X H L L L L L L L L L G1 L X H H H H H H H H H C X X L L L L H H H H X SELECT B X X L L H H L L H H X A X X L H L H L H L H X Y0 L L H L L L L L L L Y1 Y2 Y3 Y4 Y5 Y6 Y7 L L L L L L L L L H
L L L L L L L L L L L L L L L L L L H L L L L L L H L L L L L L H L L L L L L H L L L L L L H L L L L L L H L L L L L L Outputs corresponding to stored address H: all others L
X : Don't Care
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M74HC237
LOGIC DIAGRAM
This logic diagram has not be used to estimate propagation delays
ABSOLUTE MAXIMUM RATINGS
Symbol VCC VI VO IIK IOK IO Supply Voltage DC Input Voltage DC Output Voltage DC Input Diode Current DC Output Diode Current DC Output Current Parameter Value -0.5 to +7 -0.5 to VCC + 0.5 -0.5 to VCC + 0.5 20 20 25 50 500(*) -65 to +150 300 Unit V V V mA mA mA mA mW C C
ICC or IGND DC VCC or Ground Current PD Power Dissipation Tstg TL Storage Temperature Lead Temperature (10 sec)
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied (*) 500mW at 65 C; derate to 300mW by 10mW/C from 65C to 85C
RECOMMENDED OPERATING CONDITIONS
Symbol VCC VI VO Top tr, tf Supply Voltage Input Voltage Output Voltage Operating Temperature Input Rise and Fall Time VCC = 2.0V VCC = 4.5V VCC = 6.0V Parameter Value 2 to 6 0 to VCC 0 to VCC -55 to 125 0 to 1000 0 to 500 0 to 400 Unit V V V C ns ns ns 3/11
M74HC237
DC SPECIFICATIONS
Test Condition Symbol Parameter VCC (V) 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 4.5 6.0 VOL Low Level Output Voltage 2.0 4.5 6.0 4.5 6.0 II ICC Input Leakage Current Quiescent Supply Current 6.0 6.0 IO=-20 A IO=-20 A IO=-20 A IO=-4.0 mA IO=-5.2 mA IO=20 A IO=20 A IO=20 A IO=4.0 mA IO=5.2 mA VI = VCC or GND VI = VCC or GND TA = 25C Min. 1.5 3.15 4.2 0.5 1.35 1.8 1.9 4.4 5.9 4.18 5.68 2.0 4.5 6.0 4.31 5.8 0.0 0.0 0.0 0.17 0.18 0.1 0.1 0.1 0.26 0.26 0.1 4 1.9 4.4 5.9 4.13 5.63 0.1 0.1 0.1 0.33 0.33 1 40 Typ. Max. Value -40 to 85C Min. 1.5 3.15 4.2 0.5 1.35 1.8 1.9 4.4 5.9 4.10 5.60 0.1 0.1 0.1 0.40 0.40 1 80 A A V V Max. -55 to 125C Min. 1.5 3.15 4.2 0.5 1.35 1.8 Max. V Unit
VIH
High Level Input Voltage Low Level Input Voltage High Level Output Voltage
VIL
V
VOH
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M74HC237
AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, Input tr = tf = 6ns)
Test Condition Symbol Parameter VCC (V) 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 2.0 4.5 6.0 2.0 4.5 6.0 TA = 25C Min. Typ. 30 8 7 60 19 16 45 15 13 45 15 13 65 21 18 10 6 6 12 3 2 Max. 75 15 13 180 36 31 140 28 24 140 28 24 190 38 32 75 15 13 50 10 9 25 5 5 Value -40 to 85C Min. Max. 95 19 16 225 45 38 175 35 30 175 35 30 240 48 41 95 19 16 65 13 11 30 6 5 -55 to 125C Min. Max. 110 22 19 270 54 46 210 42 36 210 42 36 285 57 48 110 22 19 75 15 13 40 8 7 ns Unit
tTLH tTHL Output Transition Time tPLH tPHL Propagation Delay Time (A, B, C - Y) tPLH tPHL Propagation Delay Time (G1 - Y) tPLH tPHL Propagation Delay Time (G2 - Y) tPLH tPHL Propagation Delay Time (GL - Y) tW(L) Minimum Pulse Width (GL) Minimum Set-up Time (A, B, C - GL) Minimum Hold Time (A, B, C - GL)
ns
ns
ns
ns
ns
ts
ns
th
ns
CAPACITIVE CHARACTERISTICS
Test Condition Symbol Parameter VCC (V) 5.0 5.0 TA = 25C Min. Typ. 5 52 Max. 10 Value -40 to 85C Min. Max. 10 -55 to 125C Min. Max. 10 pF pF Unit
CIN CPD
Input Capacitance Power Dissipation Capacitance (note 1)
1) CPD is defined as the value of the IC's internal equivalent capacitance which is calculated from the operating current consumption without load.
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M74HC237
TEST CIRCUIT
CL = 50pF or equivalent (includes jig and probe capacitance) RT = ZOUT of pulse generator (typically 50)
WAVEFORM 1: PROPAGATION DELAY TIME (f=1MHz; 50% duty cycle)
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M74HC237
WAVEFORM 2: SETUP AND HOLD TIME, MINIMUM PULSE WIDTH (GL)(f=1MHz; 50% duty cycle)
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M74HC237
Plastic DIP-16 (0.25) MECHANICAL DATA
mm. DIM. MIN. a1 B b b1 D E e e3 F I L Z 3.3 1.27 8.5 2.54 17.78 7.1 5.1 0.130 0.050 0.51 0.77 0.5 0.25 20 0.335 0.100 0.700 0.280 0.201 1.65 TYP MAX. MIN. 0.020 0.030 0.020 0.010 0.787 0.065 TYP. MAX. inch
P001C
8/11
M74HC237
SO-16 MECHANICAL DATA
DIM. A a1 a2 b b1 C c1 D E e e3 F G L M S 3.8 4.6 0.5 9.8 5.8 1.27 8.89 4.0 5.3 1.27 0.62 8 (max.) 0.149 0.181 0.019 10 6.2 0.35 0.19 0.5 45 (typ.) 0.385 0.228 0.050 0.350 0.157 0.208 0.050 0.024 0.393 0.244 0.1 mm. MIN. TYP MAX. 1.75 0.2 1.65 0.46 0.25 0.013 0.007 0.019 0.003 MIN. inch TYP. MAX. 0.068 0.007 0.064 0.018 0.010
PO13H
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M74HC237
TSSOP16 MECHANICAL DATA
mm. DIM. MIN. A A1 A2 b c D E E1 e K L 0 0.45 0.60 0.05 0.8 0.19 0.09 4.9 6.2 4.3 5 6.4 4.4 0.65 BSC 8 0.75 0 0.018 0.024 1 TYP MAX. 1.2 0.15 1.05 0.30 0.20 5.1 6.6 4.48 0.002 0.031 0.007 0.004 0.193 0.244 0.169 0.197 0.252 0.173 0.0256 BSC 8 0.030 0.004 0.039 MIN. TYP. MAX. 0.047 0.006 0.041 0.012 0.0089 0.201 0.260 0.176 inch
A
A2 A1 b e K c L E
D
E1
PIN 1 IDENTIFICATION
1
0080338D
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M74HC237
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. (c) The ST logo is a registered trademark of STMicroelectronics (c) 2001 STMicroelectronics - Printed in Italy - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia - Malta - Morocco Singapore - Spain - Sweden - Switzerland - United Kingdom (c) http://www.st.com
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