SN74LS157 Quad 2-Input Multiplexer The LSTTL / MSI SN74LS157 is a high speed Quad 2-Input Multiplexer. Four bits of data from two sources can be selected using the common Select and Enable inputs. The four buffered outputs present the selected data in the true (non-inverted) form. The LS157 can also be used to generate any four of the 16 different functions of two variables. The LS157 is fabricated with the Schottky barrier diode process for high speed and is completely compatible with all ON Semiconductor TTL families. • • • • • • http://onsemi.com LOW POWER SCHOTTKY Schottky Process for High Speed Multifunction Capability Non-Inverting Outputs Input Clamp Diodes Limit High Speed Termination Effects Special Circuitry Ensures Glitch Free Multiplexing ESD > 3500 Volts GUARANTEED OPERATING RANGES Symbol VCC Parameter Supply Voltage 16 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 1 PLASTIC N SUFFIX CASE 648 16 1 SOIC D SUFFIX CASE 751B ORDERING INFORMATION Semiconductor Components Industries, LLC, 1999 December, 1999 – Rev. 6 1 Device Package Shipping SN74LS157N 16 Pin DIP 2000 Units/Box SN74LS157D 16 Pin 2500/Tape & Reel Publication Order Number: SN74LS157/D SN74LS157 CONNECTION DIAGRAM DIP (TOP VIEW) VCC E I0c I1c Zc I0d I1d Zd 16 15 14 13 12 11 10 9 NOTE: The Flatpak version has the same pinouts (Connection Diagram) as the Dual In-Line Package. 1 S 2 I0a 3 I1d 4 Za 5 I0b 6 I1b 7 Zb 8 GND LOADING (Note a) HIGH LOW 1.0 U.L. 1.0 U.L. 0.5 U.L. 0.5 U.L. 10 U.L. 0.5 U.L. 0.5 U.L. 0.25 U.L. 0.25 U.L. 5 U.L. PIN NAMES S E I0a – I0d I1a – I1d Za – Zd Common Select Input Enable (Active LOW) Input Data Inputs from Source 0 Data Inputs from Source 1 Multiplexer Outputs NOTES: a) 1 TTL Unit Load (U.L.) = 40 mA HIGH/1.6 mA LOW. LOGIC SYMBOL 15 2 3 5 6 14 13 11 10 E I0a I1a I0b I1b I0c I1c I0d I1d 1 S Za Zb Zc Zd 4 7 12 9 VCC = PIN 16 GND = PIN 8 http://onsemi.com 2 SN74LS157 LOGIC DIAGRAM I0a I1a 2 3 I0b I1b 5 6 I0c 14 Za I0d 13 Zb I1d E S 11 10 12 7 4 I1c 1 VCC = PIN 16 GND = PIN 8 = PIN NUMBERS 9 Zc 15 Zd FUNCTIONAL DESCRIPTION The LS157 is a Quad 2-Input Multiplexer fabricated with the Schottky barrier diode process for high speed. It selects four bits of data from two sources under the control of a common Select Input (S). The Enable Input (E) is active LOW. When E is HIGH, all of the outputs (Z) are forced LOW regardless of all other inputs. The LS157 is the logic implementation of a 4-pole, 2-position switch where the position of the switch is determined by the logic levels supplied to the Select Input. The logic equations for the outputs are: Za = E ⋅ (I1a ⋅ S + I0a ⋅ S) Zb = E ⋅ (I1b ⋅ S + I0b ⋅ S) Zc = E ⋅ (I1c ⋅ S + I0c ⋅ S) Zd = E ⋅ (I1d ⋅ S + I0d ⋅ S) A common use of the LS157 is the moving of data from two groups of registers to four common output busses. The particular register from which the data comes is determined by the state of the Select Input. A less obvious use is as a function generator. The LS157 can generate any four of the 16 different functions of two variables with one variable common. This is useful for implementing highly irregular logic. TRUTH TABLE ENABLE SELECT INPUT E S I0 I1 Z H L L L L X H H L L X X X L H X L H X X L L H L H INPUTS H = HIGH Voltage Level L = LOW Voltage Level X = Don’t Care http://onsemi.com 3 OUTPUT SN74LS157 DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol Parameter VIH Input HIGH Voltage VIL Input LOW Voltage VIK Input Clamp Diode Voltage VOH Output HIGH Voltage VOL O Output LOW Voltage IIH Min Typ Unit Max 2.0 0.8 – 0.65 2.7 – 1.5 3.5 Short Circuit Current (Note 1) ICC Power Supply Current 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 V IOL = 4.0 mA 0.35 0.5 V IOL = 8.0 mA 20 40 µA VCC = MAX, VIN = 2.7 V mA VCC = MAX, VIN = 7.0 V – 0.4 – 0.8 mA VCC = MAX, VIN = 0.4 V – 100 mA VCC = MAX 16 mA VCC = MAX 0.1 0.2 IOS V 0.4 I0, I1 E, S Input LOW Current I0, I1 E, S V 0.25 Input HIGH Current I0, I1 E, S IIL Test Conditions Guaranteed Input HIGH Voltage for All Inputs – 20 Note 1: Not more than one output should be shorted at a time, nor for more than 1 second. AC CHARACTERISTICS (TA = 25°C) Limits Symbol Parameter Min Typ Max Unit Test Conditions tPLH tPHL Propagation Delay Data to Output 9.0 9.0 14 14 ns Figure 2 tPLH tPHL Propagation Delay Enable to Output 13 14 20 21 ns Figure 1 tPLH tPHL Propagation Delay Select to Output 15 18 23 27 ns Figure 2 VCC = 5.0 V CL = 15 pF AC WAVEFORMS VIN VOUT 1.3 V 1.3 V VIN tPHL tPLH 1.3 V 1.3 V VOUT Figure 1. 1.3 V tPHL tPLH 1.3 V 1.3 V Figure 2. http://onsemi.com 4 1.3 V SN74LS157 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 SN74LS157 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 SN74LS157 Notes http://onsemi.com 7 SN74LS157 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 North America 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] ASIA/PACIFIC: LDC for ON Semiconductor – Asia Support Phone: 303–675–2121 (Tue–Fri 9:00am to 1:00pm, Hong Kong Time) Toll Free from Hong Kong 800–4422–3781 Email: ONlit–[email protected] N. American Technical Support: 800–282–9855 Toll Free USA/Canada EUROPE: LDC for ON Semiconductor – European Support German Phone: (+1) 303–308–7140 (M–F 2:30pm to 5:00pm Munich Time) Email: ONlit–[email protected] French Phone: (+1) 303–308–7141 (M–F 2:30pm to 5:00pm Toulouse Time) Email: ONlit–[email protected] English Phone: (+1) 303–308–7142 (M–F 1:30pm to 5:00pm UK Time) Email: [email protected] JAPAN: ON Semiconductor, Japan Customer Focus Center 4–32–1 Nishi–Gotanda, Shinagawa–ku, Tokyo, Japan 141–8549 Phone: 81–3–5487–8345 Email: [email protected] Fax Response Line: 303–675–2167 800–344–3810 Toll Free USA/Canada ON Semiconductor Website: http://onsemi.com For additional information, please contact your local Sales Representative. http://onsemi.com 8 SN74LS157/D