M74HC238 3 TO 8 LINE DECODER n HIGH SPEED: t = 15ns (TYP.) at V = 6V PD CC n LOW POWER DISSIPATION: I = 4m A(MAX.) at T =25°C CC A n HIGH NOISE IMMUNITY: V = V = 28 % V (MIN.) NIH NIL CC n SYMMETRICAL OUTPUT IMPEDANCE: DIP SOP TSSOP |I | = I = 4mA (MIN) OH OL n BALANCED PROPAGATION DELAYS: tPLH @ tPHL ORDER CODES n WIDE OPERATING VOLTAGE RANGE: PACKAGE TUBE T & R V (OPR) = 2V to 6V CC DIP M74HC238B1R n PIN AND FUNCTION COMPATIBLE WITH SOP M74HC238M1R M74HC238RM13TR 74 SERIES 238 TSSOP M74HC238TTR DESCRIPTION The M74HC238 is an high speed CMOS 3 TO 8 inhibited and all the 8 outputs go low. Three LINE DECODER fabricated with silicon gate enable inputs are provided to ease cascade C2MOS technology. connection and application of this address If the device is enabled, 3 binary select inputs (A, decoder in memory systems. B and C) determine which one of outputs will go All inputs are equipped with protection circuits high. When enable input G1 is held "Low" or either against static discharge and transient excess G2A or G2B is held "High" decoding function is voltage. PIN CONNECTION AND IEC LOGIC SYMBOLS July 2001 1/10

M74HC238 INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION PIN No SYMBOL NAME AND FUNCTION 1, 2, 3 A, B, C Data Inputs 4, 5 G2A G2B Enable Input (Active LOW) 6 G1 Data Enable Input (Active HIGH) 15, 14, 13, Y0 to Y7 Outputs 12, 11, 10, 9, 7 8 GND Ground (0V) 16 V Positive Supply Voltage CC TRUTH TABLE INPUTS OUTPUTS SELECTED ENABLE SELECT OUTPUT G2B G2A G1 C B A Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 X X L X X X L L L L L L L L NONE X H X X X X L L L L L L L L NONE H X X X X X L L L L L L L L NONE L L H L L L H L L L L L L L Y0 L L H L L H L H L L L L L L Y1 L L H L H L L L H L L L L L Y2 L L H L H H L L L H L L L L Y3 L L H H L L L L L L H L L L Y4 L L H H L H L L L L L H L L Y5 L L H H H L L L L L L L H L Y6 L L H H H H L L L L L L L H Y7 X : Don’t Care LOGIC DIAGRAM This logic diagram has not be used to estimate propagation delays 2/10

M74HC238 ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit VCC Supply Voltage -0.5 to +7 V VI DC Input Voltage -0.5 to VCC + 0.5 V VO DC Output Voltage -0.5 to VCC + 0.5 V IIK DC Input Diode Current – 20 mA IOK DC Output Diode Current – 20 mA IO DC Output Current – 25 mA ICC or IGND DC VCC or Ground Current – 50 mA PD Power Dissipation 500(*) mW Tstg Storage Temperature -65 to +150 °C TL Lead Temperature (10 sec) 300 °C 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 (cid:176) C; derate to 300mW by 10mW/(cid:176) C from 65(cid:176) C to 85(cid:176) C RECOMMENDED OPERATING CONDITIONS Symbol Parameter Value Unit VCC Supply Voltage 2 to 6 V VI Input Voltage 0 to VCC V VO Output Voltage 0 to VCC V Top Operating Temperature -55 to 125 °C Input Rise and Fall Time VCC = 2.0V 0 to 1000 ns tr, tf VCC = 4.5V 0 to 500 ns VCC = 6.0V 0 to 400 ns 3/10

M74HC238 DC SPECIFICATIONS Test Conditions Value Symbol Parameter V TA = 25°C -40 to 85°C -55 to 125°C Unit CC (V) Min. Typ. Max. Min. Max. Min. Max. V High Level Input 2.0 1.5 1.5 1.5 IH Voltage 4.5 3.15 3.15 3.15 V 6.0 4.2 4.2 4.2 V Low Level Input 2.0 0.5 0.5 0.5 IL Voltage 4.5 1.35 1.35 1.35 V 6.0 1.8 1.8 1.8 VOH High Level Output 2.0 IO=-20 m A 1.9 2.0 1.9 1.9 Voltage 4.5 IO=-20 m A 4.4 4.5 4.4 4.4 6.0 IO=-20 m A 5.9 6.0 5.9 5.9 V 4.5 IO=-4.0 mA 4.18 4.31 4.13 4.10 6.0 IO=-5.2 mA 5.68 5.8 5.63 5.60 VOL Low Level Output 2.0 IO=20 m A 0.0 0.1 0.1 0.1 Voltage 4.5 IO=20 m A 0.0 0.1 0.1 0.1 6.0 IO=20 m A 0.0 0.1 0.1 0.1 V 4.5 IO=4.0 mA 0.17 0.26 0.33 0.40 6.0 IO=5.2 mA 0.18 0.26 0.33 0.40 I Input Leakage I Current 6.0 VI = VCC or GND – 0.1 – 1 – 1 m A I Quiescent Supply CC Current 6.0 VI = VCC or GND 4 40 80 m A AC ELECTRICAL CHARACTERISTICS (C = 50 pF, Input t = t = 6ns) L r f Test Conditions Value Symbol Parameter V TA = 25°C -40 to 85°C -55 to 125°C Unit CC (V) Min. Typ. Max. Min. Max. Min. Max. t t Output Transition 2.0 30 75 95 110 TLH THL Time 4.5 8 15 19 22 ns 6.0 7 13 16 19 t t Propagation Delay 2.0 50 150 190 225 PLH PHL Time (A, B, C - Y) 4.5 17 30 38 45 ns 6.0 15 26 32 38 t t Propagation Delay 2.0 50 150 190 225 PLH PHL Time (G1 - Y) 4.5 17 30 38 45 ns 6.0 15 26 32 38 t t Propagation Delay 2.0 50 150 190 225 PLH PHL Time (G2 - Y) 4.5 17 30 38 45 ns 6.0 15 26 32 38 4/10

M74HC238 CAPACITIVE CHARACTERISTICS Test Conditions Value Symbol Parameter V TA = 25°C -40 to 85°C -55 to 125°C Unit CC (V) Min. Typ. Max. Min. Max. Min. Max. CIN Input Capacitance 5.0 5 10 10 10 pF C Power Dissipation PD Capacitance (note 5.0 53 pF 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. (Refer to Test Circuit). Average operating current can be obtained by the following equation. I = C x V x f + I CC(opr) PD CC IN CC TEST CIRCUIT C = 50pF or equivalent (includes jig and probe capacitance) L RT = ZOUT of pulse generator (typically 50W ) 5/10

M74HC238 WAVEFORM 1: PROPAGATION DELAY TIMES (f=1MHz; 50% duty cycle) 6/10

M74HC238 Plastic DIP-16 (0.25) MECHANICAL DATA mm. inch DIM. MIN. TYP MAX. MIN. TYP. MAX. a1 0.51 0.020 B 0.77 1.65 0.030 0.065 b 0.5 0.020 b1 0.25 0.010 D 20 0.787 E 8.5 0.335 e 2.54 0.100 e3 17.78 0.700 F 7.1 0.280 I 5.1 0.201 L 3.3 0.130 Z 1.27 0.050 P001C 7/10

M74HC238 SO-16 MECHANICAL DATA mm. inch DIM. MIN. TYP MAX. MIN. TYP. MAX. A 1.75 0.068 a1 0.1 0.2 0.003 0.007 a2 1.65 0.064 b 0.35 0.46 0.013 0.018 b1 0.19 0.25 0.007 0.010 C 0.5 0.019 c1 45° (typ.) D 9.8 10 0.385 0.393 E 5.8 6.2 0.228 0.244 e 1.27 0.050 e3 8.89 0.350 F 3.8 4.0 0.149 0.157 G 4.6 5.3 0.181 0.208 L 0.5 1.27 0.019 0.050 M 0.62 0.024 S 8° (max.) PO13H 8/10

M74HC238 TSSOP16 MECHANICAL DATA mm. inch DIM. MIN. TYP MAX. MIN. TYP. MAX. A 1.2 0.047 A1 0.05 0.15 0.002 0.004 0.006 A2 0.8 1 1.05 0.031 0.039 0.041 b 0.19 0.30 0.007 0.012 c 0.09 0.20 0.004 0.0089 D 4.9 5 5.1 0.193 0.197 0.201 E 6.2 6.4 6.6 0.244 0.252 0.260 E1 4.3 4.4 4.48 0.169 0.173 0.176 e 0.65 BSC 0.0256 BSC K 0° 8° 0° 8° L 0.45 0.60 0.75 0.018 0.024 0.030 A A2 K L A1 b e c E D E1 PIN 1 IDENTIFICATION 1 0080338D 9/10

M74HC238 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 Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia - Malta - Morocco Singapore - Spain - Sweden - Switzerland - United Kingdom © http://www.st.com 10/10