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| MC54/74F138 1-OF-8 DECODER/ DEMULTIPLEXER The MC54/74F138 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 F138 devices or to a 1-of-32 decoder using four F138s and one inverter. * Demultiplexing Capability * Multiple Input Enable for Easy Expansion * Active Low Mutually Exclusive Outputs * Input Clamp Diodes Limit High-Speed Termination Effects CONNECTION DIAGRAM DIP (TOP VIEW) VCC 16 O0 15 O1 14 O2 13 O3 12 O4 11 O5 10 O6 9 16 1 1-OF-8 DECODER/ DEMULTIPLEXER FASTTM SHOTTKY TTL J SUFFIX CERAMIC CASE 620-09 16 N SUFFIX PLASTIC CASE 648-08 1 1 A0 2 A1 3 A2 4 E1 5 E2 6 E3 7 O7 8 GND 16 1 D SUFFIX SOIC CASE 751B-03 LOGIC DIAGRAM A2 3 2 ORDERING INFORMATION VCC = PIN 16 GND = PIN 8 = PIN NUMBERS MC54FXXXJ MC74FXXXN MC74FXXXD Ceramic Plastic SOIC A1 1 A0 4 E1 E2 E3 5 6 LOGIC SYMBOL 123 456 123 A0 A1 A2 O0 O1 O2 O3 O4 O5 O6 O7 7 9 10 11 12 13 14 15 15 14 13 12 11 10 9 7 O0 VCC = PIN 16 GND = PIN 8 O7 O6 O5 O4 O3 O2 O1 FAST AND LS TTL DATA 4-53 MC54/74F138 GUARANTEED OPERATING RANGES Symbol VCC TA IOH IOL Supply Voltage Operating Ambient Temperature Range Parameter 54, 74 54 74 Output Current -- High Output Current -- Low 54, 74 54, 74 Min 4.5 -55 0 Typ 5.0 25 25 Max 5.5 125 70 -1.0 20 mA mA Unit V C DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol VIH VIL VIK VOH VOL IIH IIL IOS ICC Parameter Input HIGH Voltage Input LOW Voltage Input Clamp Diode Voltage Output HIGH Voltage 54, 74 74 Output LOW Voltage Input HIGH Current 2.5 2.7 0.5 20 0.1 Input LOW Current Output Short Circuit Current (Note 2) Power Supply Current -60 -0.6 -150 20 Min 2.0 0.8 -1.2 Typ Max Unit V V V V V V A mA mA mA mA Test Conditions Guaranteed Input HIGH Voltage Guaranteed Input LOW Voltage VCC = MIN, IIN = -18 mA IOH = -1.0 mA IOH = -1.0 mA IOL = 20 mA VCC = 4.50 V VCC = 4.75 V VCC = MIN VCC = MAX, VIN = 2.7 V VCC = MAX, VIN = 7.0 V VCC = MAX, VIN = 0.5 V VCC = MAX, VOUT = 0 V VCC = MAX NOTES: 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 TA = +25 C Levels of Symbol tPLH tPHL tPLH tPHL tPLH tPHL Parameter Propagation Delay, Address to Output Enable to Output E1 or E2 Enable to Output E3 3 2 Delay 3 VCC = +5.0 V CL = 50 pF Min 3.0 3.0 3.5 3.0 4.0 3.5 Max 7.5 8.0 7.0 7.0 8.0 7.5 54F TA = +25C to +125C VCC = 5.0 V 10% CL = 50 pF Min 3.0 3.0 3.5 3.0 4.0 3.5 Max 12 9.5 11 8.0 12.5 8.5 74F TA = 0C to 70C VCC = 5.0 V 10% CL = 50 pF Min 3.0 3.0 3.5 3.0 4.0 3.5 Max 8.5 9.0 8.0 7.5 9.0 8.5 ns ns Unit ns FUNCTIONAL DESCRIPTION The decoder accepts three binary weighted inputs (AO, A1, A2) and when enabled provides eight mutually exclusive active LOW outputs (O0-O7). The F138 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 F138s and one inverter. The F138 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 states. FAST AND LS TTL DATA 4-54 MC54/74F138 FUNCTION TABLE Inputs E1 H X X L L L L L L L L E2 X H X L L L L L L L L E3 X X L H H H H H H H H A0 X X X L H L H L H L H A1 X X X L L H H L L H H A2 X X X L L L L H H H H O0 H H H L H H H H H H H O1 H H H H L H H H H H H O2 H H H H H L H H H H H Outputs O3 H H H H H H L H H H H O4 H H H H H H H L H H H O5 H H H H H H H H L H H O6 H H H H H H H H H L H O7 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 FO4 A3 A4 H 123 A0 A1 A2 E A0 A1 A2 123 E A0 A1 A2 123 E A0 A1 A2 123 E F138 O0 O1 O2 O3 O4 O5 O6 O7 F138 O0 O1 O2 O3 O4 O5 O6 O7 F138 O0 O1 O2 O3 O4 O5 O6 O7 F138 O0 O1 O2 O3 O4 O5 O6 O7 O0 O31 FAST AND LS TTL DATA 4-55 |
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