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| SN54/74LS42 ONE-OF-TEN DECODER The LSTTL / MSI SN54 / 74LS42 is a Multipurpose Decoder designed to accept four BCD inputs and provide ten mutually exclusive outputs. The LS42 is fabricated with the Schottky barrier diode process for high speed and is completely compatible with all Motorola TTL families. ONE-OF-TEN DECODER LOW POWER SCHOTTKY * * * * Multifunction Capability Mutually Exclusive Outputs Demultiplexing Capability Input Clamp Diodes Limit High Speed Termination Effects CONNECTION DIAGRAM DIP (TOP VIEW) VCC 16 A0 15 A1 14 A2 13 A3 12 9 11 8 10 7 9 NOTE: The Flatpak version has the same pinouts (Connection Diagram) as the Dual In-Line Package. 16 1 J SUFFIX CERAMIC CASE 620-09 1 0 2 1 3 2 4 3 5 4 6 5 7 6 8 GND 16 1 N SUFFIX PLASTIC CASE 648-08 PIN NAMES LOADING (Note a) HIGH LOW 0.25 U.L. 5(2.5) U.L. 16 1 A0 - A3 0 to 9 Address Inputs Outputs, Active LOW (Note b) 0.5 U.L. 10 U.L. D SUFFIX SOIC CASE 751B-03 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. ORDERING INFORMATION SN54LSXXJ SN74LSXXN SN74LSXXD Ceramic Plastic SOIC LOGIC DIAGRAM A0 15 A1 14 A2 13 A3 12 LOGIC SYMBOL 15 14 13 12 A0 A1 A2 A3 012345 6789 1 2 3 4 5 6 7 9 10 11 1 2 3 4 5 6 7 9 10 11 VCC = PIN 16 GND = PIN 8 0 1 2 3 4 5 6 7 8 9 VCC = PIN 16 GND = PIN 8 = PIN NUMBERS FAST AND LS TTL DATA 5-53 SN54/74LS42 FUNCTIONAL DESCRIPTION The LS42 decoder accepts four active HIGH BCD inputs and provides ten mutually exclusive active LOW outputs, as shown by logic symbol or diagram. The active LOW outputs facilitate addressing other MSI units with LOW input enables. The logic design of the LS42 ensures that all outputs are HIGH when binary codes greater than nine are applied to the inputs. The most significant input A3 produces a useful inhibit function when the LS42 is used as a one-of-eight decoder. The A3 input can also be used as the Data input in an 8-output demultiplexer application. TRUTH TABLE A0 L H L H L H L H L H L H L H L H A1 L L H H L L H H L L H H L L H H A2 L L L L H H H H L L L L H H H H A3 L L L L L L L L H H H H H H H H 0 L H H H H H H H H H H H H H H H 1 H L H H H H H H H H H H H H H H 2 H H L H H H H H H H H H H H H H 3 H H H L H H H H H H H H H H H H 4 H H H H L H H H H H H H H H H H 5 H H H H H L H H H H H H H H H H 6 H H H H H H L H H H H H H H H H 7 H H H H H H H L H H H H H H H H 8 H H H H H H H H L H H H H H H H 9 H H H H H H H H H L H H H H H H H = HIGH Voltage Level L = LOW Voltage Level 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 5-54 SN54/74LS42 DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol VIH VIL VIK VOH Parameter Input HIGH Voltage 54 Input LOW Voltage 74 Input Clamp Diode Voltage 54 Output HIGH Voltage 74 54, 74 VOL Output LOW Voltage 74 Input HIGH Current 0.1 Input LOW Current Short Circuit Current (Note 1) Power Supply Current - 20 - 0.4 -100 13 0.35 0.5 20 IIH IIL IOS ICC V A mA mA mA mA 2.7 3.5 0.25 0.4 V V 2.5 - 0.65 3.5 0.8 - 1.5 V V Min 2.0 0.7 V Typ Max Unit V Test Conditions Guaranteed Input HIGH Voltage for All Inputs Guaranteed Input LOW Voltage for All Inputs VCC = MIN, IIN = - 18 mA VCC = MIN, IOH = MAX, VIN = VIH or VIL per Truth Table IOL = 4.0 mA IOL = 8.0 mA VCC = VCC MIN, VIN = VIL or VIH per Truth Table 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) Limits Symbol tPLH tPHL tPLH tPHL Parameter Propagation Delay (2 Levels) Propagation Delay (3 Levels) Min Typ 15 15 20 20 Max 25 25 30 30 Unit ns ns Figure 2 Figure 1 VCC = 5.0 V CL = 15 pF Test Conditions AC WAVEFORMS VIN 1.3 V tPHL 1.3 V tPLH 1.3 V 1.3 V VIN 1.3 V tPHL 1.3 V tPLH 1.3 V VOUT VOUT 1.3 V Figure 1 Figure 2 FAST AND LS TTL DATA 5-55 |
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