MC54/74F139 DUAL 1-OF-4 DECODER The MC54/74F139 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 F139 can be used as a function generator providing all four miniterms of two variables. • • • • DUAL 1-OF-4 DECODER FAST SHOTTKY TTL Multifunction Capability Two Completely Independent 1-of-4 Decoders Active Low Mutually Exclusive Outputs Input Clamp Diodes Limit High-Speed Termination Effects J SUFFIX CERAMIC CASE 620-09 CONNECTION DIAGRAM 16 VCC Eb A0b A1b O0b O1b O2b O3b 16 15 14 13 12 11 10 9 1 N SUFFIX PLASTIC CASE 648-08 16 1 1 2 3 4 5 6 7 8 Ea A0a A1a O0a O1a O2a O3a GND D SUFFIX SOIC CASE 751B-03 16 1 ORDERING INFORMATION LOGIC DIAGRAM A0a A1a Ea 1 2 Eb 3 A0b A1b 15 14 MC54FXXXJ MC74FXXXN MC74FXXXD Ceramic Plastic SOIC 13 LOGIC SYMBOL 4 5 O0a 6 O1a 7 O2a 12 O3a 11 O0b 10 O1b 9 O2b O3b VCC = PIN 16 GND = PIN 8 = PIN NUMBERS FAST AND LS TTL DATA 4-56 1 2 3 15 14 13 E A0 A1 E A0 A1 O0 O1 O2 O3 O0 O1 O2 O3 4 5 6 7 12 11 10 9 VCC = Pin 16 GND = Pin 8 MC54/74F139 GUARANTEED OPERATING RANGES Symbol Parameter Min Typ Max Unit 54, 74 4.5 5.0 5.5 V 54 –55 25 125 °C 74 0 25 VCC Supply Voltage TA Operating Ambient Temperature Range IOH Output Current — High 54, 74 –1.0 mA IOL Output Current — Low 54, 74 20 mA 70 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 Min Typ Max Unit 2.0 Test Conditions V Guaranteed Input HIGH Voltage 0.8 V Guaranteed Input LOW Voltage –1.2 V VCC = MIN, IIN = –18 mA 54, 74 2.5 V IOH = –1.0 mA VCC = 4.50 V 74 2.7 V IOH = –1.0 mA VCC = 4.75 V VCC = MIN VOL Output LOW Voltage 0.5 V IOL = 20 mA IIH Input HIGH Current 20 µA VCC = MAX, VIN = 2.7 V 0.1 mA VCC = MAX, VIN = 7.0 V IIL Input LOW Current –0.6 mA VCC = MAX, VIN = 0.5 V IOS Output Short Circuit Current (Note 2) –150 mA VCC = MAX, VOUT = 0 V ICC Power Supply Current 20 mA VCC = MAX -60 1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable device type. 2. Not more than one output should be shorted at a time, nor for more than 1 second. AC CHARACTERISTICS 54/74F 54F TA = +25°C TA = -55°C to +125°C TA = 0°C to 70°C VCC = +5.0 V VCC = 5.0 V ±10% VCC = 5.0 V ±10% CL = 50 pF Symbol Parameter 74F CL = 50 pF CL = 50 pF Min Max Min Max Min Max Unit ns tPLH Propagation Delay, 3.5 7.0 2.5 12.0 3.0 8.5 tPHL Address to Output 3.5 8.0 3.5 9.5 3.5 9.0 tPLH Enable to Output 3.5 7.0 3.0 9.0 3.5 8.0 2.5 6.5 2.5 8.0 2.5 7.5 tPHL ns FUNCTIONAL DESCRIPTION The F139 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 accepts two binary weighted inputs (AO, 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 F139 generates all four miniterms of two variables. These four miniterms are useful in some applications, replacing multiple gate functions as shown in Figure 1, and thereby reducing the number of packages required in a logic network. FAST AND LS TTL DATA 4-57 MC54/74F139 FUNCTION TABLE Inputs E H L L L L A0 X L H L H Outputs A1 X L L H H O0 H L H H H O1 H H L H H O2 H H H L H O3 H H H H L H = HIGH Voltage Level L = LOW Voltage Level X = Don’t Care E A0 A1 O0 E A0 A1 O1 E A0 A1 O2 E A0 A1 O2 E A0 A1 O3 E A0 A1 O3 E A0 A1 E A0 A1 Figure 1. FAST AND LS TTL DATA 4-58 O0 O1