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| DUAL 1-OF-4 DECODER/ DEMULTIPLEXER The LSTTL/MSI SN54/74LS139 is a high speed Dual 1-of-4 Decoder /Demultiplexer. The device has two independent decoders, each accepting two inputs and providing four mutually exclusive active LOW Outputs. Each decoder has an active LOW Enable input which can be used as a data input for a 4-output demultiplexer. Each half of the LS139 can be used as a function generator providing all four minterms of two variables. The LS139 is fabricated with the Schottky barrier diode process for high speed and is completely compatible with all Motorola TTL families. SN54/74LS139 DUAL 1-OF-4 DECODER / DEMULTIPLEXER LOW POWER SCHOTTKY * * * * * * Schottky Process for High Speed Multifunction Capability Two Completely Independent 1-of-4 Decoders Active Low Mutually Exclusive Outputs Input Clamp Diodes Limit High Speed Termination Effects ESD > 3500 Volts CONNECTION DIAGRAM DIP (TOP VIEW) VCC 16 Eb 15 AOb 14 A1b 13 O0b 12 O1b 11 O2b 10 O3b 9 NOTE: The Flatpak version has the same pinouts (Connection Diagram) as the Dual In-Line Package. J SUFFIX CERAMIC CASE 620-09 16 1 16 1 N SUFFIX PLASTIC CASE 648-08 1 Ea 2 A0a 3 A1a 4 O0a 5 O1a 6 O2a 7 8 16 1 O3a GND LOADING (Note a) HIGH LOW 0.25 U.L. 0.25 U.L. 5 (2.5) U.L. D SUFFIX SOIC CASE 751B-03 PIN NAMES A0, A1 E O0 - O 3 Address Inputs Enable (Active LOW) Input Active LOW Outputs (Note b) 0.5 U.L. 0.5 U.L. 10 U.L. ORDERING INFORMATION SN54LSXXXJ SN74LSXXXN SN74LSXXXD Ceramic Plastic SOIC NOTES: a) 1 TTL Unit Load (U.L.) = 40 A HIGH/1.6 mA LOW. b) The Output LOW drive factor is 2.5 U.L. for Military (54) and 5 U.L. for Commercial (74) Temperature Ranges. LOGIC DIAGRAM Ea 1 2 LOGIC SYMBOL 1 23 15 14 13 A0a A1a 3 15 Eb 14 A0b A1b 13 E A0 A1 E A0 A1 DECODER a O0 O1 O2 O3 DECODER b O0 O1 O2 O3 VCC = PIN 16 GND = PIN 8 = PIN NUMBERS 4 5 6 7 12 11 10 9 VCC = PIN 16 GND = PIN 8 4 5 6 7 12 11 10 9 O0a O1a O2a O3a O0b O1b O2b O3b FAST AND LS TTL DATA 5-1 SN54/74LS139 FUNCTIONAL DESCRIPTION The LS139 is a high speed dual 1-of-4 decoder/demultiplexer fabricated with the Schottky barrier diode process. The device has two independent decoders, each of which accept two binary weighted inputs (A0, A1) and provide four mutually exclusive active LOW outputs (O0 - O3). Each decoder has an active LOW Enable (E). When E is HIGH all outputs are forced HIGH. The enable can be used as the data input for a 4-output demultiplexer application. Each half of the LS139 generates all four minterms of two variables. These four minterms are useful in some applications, replacing multiple gate functions as shown in Fig. a, and thereby reducing the number of packages required in a logic network. TRUTH TABLE INPUTS E H L L L L A0 X L H L H A1 X L L H H O0 H L H H H OUTPUTS O1 H H L H H O2 H H H L H O3 H H H H L E A0 A1 E A0 A1 E A0 A1 E A0 A1 E O0 A0 A1 E O1 A0 A1 E O2 A0 A1 E O3 A0 A1 O0 O1 O2 O3 H = HIGH Voltage Level L = LOW Voltage Level X = Don't Care Figure a GUARANTEED OPERATING RANGES Symbol VCC TA IOH IOL Supply Voltage Operating Ambient Temperature Range Output Current -- High Output Current -- Low Parameter 54 74 54 74 54, 74 54 74 Min 4.5 4.75 - 55 0 Typ 5.0 5.0 25 25 Max 5.5 5.25 125 70 - 0.4 4.0 8.0 Unit V C mA mA FAST AND LS TTL DATA 5-2 SN54/74LS139 DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol S bl VIH VIL VIK VOH Parameter P Input HIGH Voltage Input LOW Voltage Input Clamp Diode Voltage Output HIGH Voltage O Vl 54 74 54, 74 VOL Output LOW Voltage 74 Input HIGH Current Input LOW Current Short Circuit Current (Note 1) Power Supply Current - 20 0.35 0.5 20 0.1 - 0.4 -100 11 V A mA mA mA mA 25 2.5 2.7 54 74 - 0.65 35 3.5 3.5 0.25 0.4 Min 2.0 0.7 0.8 - 1.5 V V V V Typ Max Unit Ui V V Test C di i T Conditions Guaranteed Input HIGH Voltage for All Inputs Guaranteed Input LOW Voltage for p g All Inputs VCC = MIN, IIN = - 18 mA VCC = MIN, IOH = MAX, VIN = VIH MAX, MIN, or VIL per Truth Table IOL = 4.0 mA IOL = 8.0 mA VCC = VCC MIN, VIN = VIL or VIH per Truth Table IIH IIL IOS ICC VCC = MAX, VIN = 2.7 V VCC = MAX, VIN = 7.0 V VCC = MAX, VIN = 0.4 V VCC = MAX VCC = MAX Note 1: Not more than one output should be shorted at a time, nor for more than 1 second. AC CHARACTERISTICS (TA = 25C) Symbol S bl tPLH tPHL tPLH tPHL tPLH tPHL Parameter P Propagation Delay Address to Output Propagation Delay Address to Output Propagation Delay Enable to Output Levels of Delay 2 2 3 3 2 2 Limits Min Typ 13 22 18 25 16 21 Max 20 33 29 38 24 32 Unit Ui ns ns ns VCC = 5.0 V 50 CL = 15 pF Test C di i T Conditions AC WAVEFORMS VIN 1.3 V tPHL VOUT 1.3 V 1.3 V tPLH 1.3 V VOUT VIN 1.3 V tPHL 1.3 V tPLH 1.3 V 1.3 V Figure 1 Figure 2 FAST AND LS TTL DATA 5-3 |
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