SN74LS138 1-of-8 Decoder/ Demultiplexer The LSTTL/MSI SN74LS138 is a high speed 1-of-8 Decoder/ Demultiplexer. This device is ideally suited for high speed bipolar memory chip select address decoding. The multiple input enables allow parallel expansion to a 1-of-24 decoder using just three LS138 devices or to a 1-of-32 decoder using four LS138s and one inverter. The LS138 is fabricated with the Schottky barrier diode process for high speed and is completely compatible with all ON Semiconductor TTL families. • Demultiplexing Capability • Multiple Input Enable for Easy Expansion • Typical Power Dissipation of 32 mW • Active Low Mutually Exclusive Outputs • Input Clamp Diodes Limit High Speed Termination Effects http://onsemi.com LOW POWER SCHOTTKY 16 1 PLASTIC N SUFFIX CASE 648 GUARANTEED OPERATING RANGES Symbol VCC Parameter Supply Voltage Min Typ Max Unit 4.75 5.0 5.25 V 0 25 70 °C TA Operating Ambient Temperature Range IOH Output Current – High –0.4 mA IOL Output Current – Low 8.0 mA 16 1 SOIC D SUFFIX CASE 751B 16 1 SOEIAJ M SUFFIX CASE 966 ORDERING INFORMATION Device Package Shipping SN74LS138N 16 Pin DIP 2000 Units/Box SN74LS138D SOIC–16 38 Units/Rail SN74LS138DR2 SOIC–16 2500/Tape & Reel SN74LS138M SOEIAJ–16 See Note 1 SN74LS138MEL SOEIAJ–16 See Note 1 1. For ordering information on the EIAJ version of the SOIC package, please contact your local ON Semiconductor representative. Semiconductor Components Industries, LLC, 2001 October, 2001 – Rev. 7 1 Publication Order Number: SN74LS138/D SN74LS138 CONNECTION DIAGRAM DIP (TOP VIEW) VCC 16 O0 15 O1 14 O2 13 O3 12 O4 11 O5 10 O6 9 NOTE: The Flatpak version has the same pinouts (Connection Diagram) as the Dual InLine Package. 1 2 A0 A1 3 4 5 6 7 8 A2 E1 E2 E3 O7 GND LOADING (Note a) HIGH LOW 0.5 U.L. 0.5 U.L. 0.5 U.L. 10 U.L. 0.25 U.L. 0.25 U.L. 0.25 U.L. 5 U.L. PIN NAMES A0 - A2 E1, E2 E3 O0 - O7 Address Inputs Enable (Active LOW) Inputs Enable (Active HIGH) Input Active LOW Outputs NOTES: a) 1 TTL Unit Load (U.L.) = 40 A HIGH/1.6 mA LOW. LOGIC SYMBOL 1 2 3 456 1 23 A0 A1 A2 E O0 O1 O2 O3 O4 O5 O6 O7 15 14 13 12 11 10 9 7 VCC = PIN 16 GND = PIN 8 LOGIC DIAGRAM A2 3 A1 2 7 9 O7 E1 E2 E3 A0 1 4 10 O6 11 O5 5 12 O4 6 13 O3 14 O2 http://onsemi.com 2 VCC = PIN 16 GND = PIN 8 = Pin Numbers 15 O1 O0 SN74LS138 FUNCTIONAL DESCRIPTION The LS138 is a high speed 1-of-8 Decoder/Demultiplexer fabricated with the low power Schottky barrier diode process. The decoder accepts three binary weighted inputs (A0, A1, A2) and when enabled provides eight mutually exclusive active LOW Outputs (O0–O7). The LS138 features three Enable inputs, two active LOW (E1, E2) and one active HIGH (E3). All outputs will be HIGH unless E1 and E2 are LOW and E3 is HIGH. This multiple enable function allows easy parallel expansion of the device to a 1-of-32 (5 lines to 32 lines) decoder with just four LS138s and one inverter. (See Figure a.) The LS138 can be used as an 8-output demultiplexer by using one of the active LOW Enable inputs as the data input and the other Enable inputs as strobes. The Enable inputs which are not used must be permanently tied to their appropriate active HIGH or active LOW state. TRUTH TABLE INPUTS OUTPUTS E1 E2 E3 A0 A1 A2 O0 O1 O2 O3 O4 O5 O6 O7 H X X L L L L L L L L X H X L L L L L L L L X X L H H H H H H H H X X X L H L H L H L H X X X L L H H L L H H X X X L L L L H H H H H H H L H H H H H H H H H H H L H H H H H H H H H H H L H H H H H H H H H H H L H H H H H H H H H H H L H H H H H H H H H H H L H H H H H H H H H H H L H H H H H H H H H H H L H = HIGH Voltage Level L = LOW Voltage Level X = Don’t Care A0 A1 A2 LS04 A3 A4 H 123 A0 A1 A2 E 123 A0 A1 A2 123 A0 A1 A2 E E 123 A0 A1 A2 E LS138 LS138 LS138 LS138 O0 O1 O2 O3 O4 O5 O6 O7 O0 O1 O2 O3 O4 O5 O6 O7 O0 O1 O2 O3 O4 O5 O6 O7 O0 O1 O2 O3 O4 O5 O6 O7 O0 O31 Figure a http://onsemi.com 3 SN74LS138 DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol Min Parameter VIH Input HIGH Voltage VIL Input LOW Voltage VIK Input Clamp Diode Voltage Typ Max Unit 2.0 0.8 –0.65 2.7 VOH Output HIGH Voltage VOL Output LOW Voltage IIH Input HIGH Current IIL Input LOW Current IOS Short Circuit Current (Note 2) –1.5 3.5 Test Conditions V Guaranteed Input HIGH Voltage for All Inputs V Guaranteed Input LOW Voltage for All Inputs V VCC = MIN, IIN = –18 mA V VCC = MIN, IOH = MAX, VIN = VIH or VIL per Truth Table VCC = VCC MIN, VIN = VIL or VIH per Truth Table 0.25 0.4 V IOL = 4.0 mA 0.35 0.5 V IOL = 8.0 mA 20 µA VCC = MAX, VIN = 2.7 V 0.1 mA VCC = MAX, VIN = 7.0 V –0.4 mA VCC = MAX, VIN = 0.4 V –100 mA VCC = MAX ICC Power Supply Current 10 mA 2. Not more than one output should be shorted at a time, nor for more than 1 second. VCC = MAX –20 AC CHARACTERISTICS (TA = 25°C) Levels of Delay Limits Typ Max Unit tPLH tPHL Propagation Delay Address to Output 2 2 13 27 20 41 ns tPLH tPHL Propagation Delay Address to Output 3 3 18 26 27 39 ns tPLH tPHL Propagation Delay E1 or E2 Enable to Output 2 2 12 21 18 32 ns tPLH tPHL Propagation Delay E3 Enable to Output 3 3 17 25 26 38 ns Symbol Parameter Min Test Conditions VCC = 5.0 V CL = 15 pF AC WAVEFORMS VIN 1.3 V tPHL VOUT VIN 1.3 V 1.3 V tPLH 1.3 V tPHL VOUT 1.3 V Figure 1. 1.3 V tPLH 1.3 V Figure 2. http://onsemi.com 4 1.3 V SN74LS138 PACKAGE DIMENSIONS N SUFFIX PLASTIC PACKAGE CASE 648–08 ISSUE R NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. DIMENSION L TO CENTER OF LEADS WHEN FORMED PARALLEL. 4. DIMENSION B DOES NOT INCLUDE MOLD FLASH. 5. ROUNDED CORNERS OPTIONAL. –A– 16 9 1 8 B F C L S –T– SEATING PLANE K H G D M J 16 PL 0.25 (0.010) M T A M http://onsemi.com 5 DIM A B C D F G H J K L M S INCHES MIN MAX 0.740 0.770 0.250 0.270 0.145 0.175 0.015 0.021 0.040 0.70 0.100 BSC 0.050 BSC 0.008 0.015 0.110 0.130 0.295 0.305 0 10 0.020 0.040 MILLIMETERS MIN MAX 18.80 19.55 6.35 6.85 3.69 4.44 0.39 0.53 1.02 1.77 2.54 BSC 1.27 BSC 0.21 0.38 2.80 3.30 7.50 7.74 0 10 0.51 1.01 SN74LS138 PACKAGE DIMENSIONS D SUFFIX PLASTIC SOIC PACKAGE CASE 751B–05 ISSUE J –A– 16 9 1 8 –B– P NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSIONS A AND B DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER SIDE. 5. DIMENSION D DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.127 (0.005) TOTAL IN EXCESS OF THE D DIMENSION AT MAXIMUM MATERIAL CONDITION. 8 PL 0.25 (0.010) M B S G R K F X 45 C –T– SEATING PLANE J M D 16 PL 0.25 (0.010) M T B S A S http://onsemi.com 6 DIM A B C D F G J K M P R MILLIMETERS MIN MAX 9.80 10.00 3.80 4.00 1.35 1.75 0.35 0.49 0.40 1.25 1.27 BSC 0.19 0.25 0.10 0.25 0 7 5.80 6.20 0.25 0.50 INCHES MIN MAX 0.386 0.393 0.150 0.157 0.054 0.068 0.014 0.019 0.016 0.049 0.050 BSC 0.008 0.009 0.004 0.009 0 7 0.229 0.244 0.010 0.019 SN74LS138 PACKAGE DIMENSIONS M SUFFIX SOEIAJ PACKAGE CASE 966–01 ISSUE O 16 NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSIONS D AND E DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS AND ARE MEASURED AT THE PARTING LINE. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.15 (0.006) PER SIDE. 4. TERMINAL NUMBERS ARE SHOWN FOR REFERENCE ONLY. 5. THE LEAD WIDTH DIMENSION (b) DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.08 (0.003) TOTAL IN EXCESS OF THE LEAD WIDTH DIMENSION AT MAXIMUM MATERIAL CONDITION. DAMBAR CANNOT BE LOCATED ON THE LOWER RADIUS OR THE FOOT. MINIMUM SPACE BETWEEN PROTRUSIONS AND ADJACENT LEAD TO BE 0.46 ( 0.018). LE 9 Q1 M E HE 1 8 L DETAIL P Z D e VIEW P A A1 b 0.13 (0.005) c M 0.10 (0.004) http://onsemi.com 7 DIM A A1 b c D E e HE L LE M Q1 Z MILLIMETERS MIN MAX --2.05 0.05 0.20 0.35 0.50 0.18 0.27 9.90 10.50 5.10 5.45 1.27 BSC 7.40 8.20 0.50 0.85 1.10 1.50 10 0 0.70 0.90 --0.78 INCHES MIN MAX --0.081 0.002 0.008 0.014 0.020 0.007 0.011 0.390 0.413 0.201 0.215 0.050 BSC 0.291 0.323 0.020 0.033 0.043 0.059 10 0 0.028 0.035 --0.031 SN74LS138 ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. PUBLICATION ORDERING INFORMATION Literature Fulfillment: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303–675–2175 or 800–344–3860 Toll Free USA/Canada Fax: 303–675–2176 or 800–344–3867 Toll Free USA/Canada Email: [email protected] JAPAN: ON Semiconductor, Japan Customer Focus Center 4–32–1 Nishi–Gotanda, Shinagawa–ku, Tokyo, Japan 141–0031 Phone: 81–3–5740–2700 Email: [email protected] ON Semiconductor Website: http://onsemi.com For additional information, please contact your local Sales Representative. N. American Technical Support: 800–282–9855 Toll Free USA/Canada http://onsemi.com 8 SN74LS138/D