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 Multifunction Capability Mutually Exclusive Outputs Demultiplexing Capability Input Clamp Diodes Limit High Speed Termination Effects LOW POWER SCHOTTKY CONNECTION DIAGRAM DIP (TOP VIEW) A0 15 VCC 16 A1 14 A2 13 A3 12 9 8 7 11 10 9 J SUFFIX CERAMIC CASE 620-09 16 1 NOTE: The Flatpak version has the same pinouts (Connection Diagram) as the Dual In-Line Package. 1 2 3 4 5 6 7 8 0 1 2 3 4 5 6 GND N SUFFIX PLASTIC CASE 648-08 16 1 PIN NAMES LOADING (Note a) HIGH A0 - A3 0 to 9 Address Inputs Outputs, Active LOW (Note b) D SUFFIX SOIC CASE 751B-03 LOW 0.5 U.L. 10 U.L. 16 0.25 U.L. 5(2.5) U.L. 1 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 A1 15 A2 LOGIC SYMBOL A3 13 14 12 15 14 13 12 A0 A1 A2 A3 0 1 2 3 4 5 6 7 8 9 1 0 3 2 1 2 4 3 6 5 4 5 7 6 9 7 10 8 11 9 VCC = PIN 16 GND = PIN 8 = PIN NUMBERS FAST AND LS TTL DATA 5-53 1 2 3 4 5 6 7 9 10 11 VCC = PIN 16 GND = PIN 8 SN54/74LS42 FUNCTIONAL DESCRIPTION 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. 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 TRUTH TABLE A0 A1 A2 A3 0 1 2 3 4 5 6 7 8 9 L H L H L H L H L H L H L H L H L L H H L L H H L L H H L L H H L L L L H H H H L L L L H H H H L L L L L L L L H H H H H H H H L H H H H H H H H H H H H H H H H L H H H H H H H H H H H H H H H H L H H H H H H H H H H H H H H H H L H H H H H H H H H H H H H H H H L H H H H H H H H H H H H H H H H L H H H H H H H H H H H H H H H H L H H H H H H H H H H H H H H H H L H H H H H H H H H H H H H H H H L H H H H H H H 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 Min Typ Max Unit VCC Symbol Supply Voltage Parameter 54 74 4.5 4.75 5.0 5.0 5.5 5.25 V TA Operating Ambient Temperature Range 54 74 - 55 0 25 25 125 70 C IOH Output Current -- High 54, 74 - 0.4 mA IOL Output Current -- Low 54 74 4.0 8.0 mA FAST AND LS TTL DATA 5-54 SN54/74LS42 DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol Min Parameter VIH Input HIGH Voltage VIL Input LOW Voltage VIK Input Clamp Diode Voltage VOH Output HIGH Voltage VOL Output LOW Voltage IIH Input HIGH Current IIL Input LOW Current IOS Short Circuit Current (Note 1) ICC Power Supply Current Typ Max 2.0 54 0.7 74 0.8 - 0.65 - 1.5 Unit Test Conditions V Guaranteed Input HIGH Voltage for All Inputs V Guaranteed Input LOW Voltage for All Inputs V VCC = MIN, IIN = - 18 mA 54 2.5 3.5 V 74 2.7 3.5 V VCC = MIN, IOH = MAX, VIN = VIH or VIL per Truth Table 54, 74 0.25 0.4 V IOL = 4.0 mA 74 0.35 0.5 V IOL = 8.0 mA VCC = VCC MIN, VIN = VIL or VIH per Truth Table 20 A VCC = MAX, VIN = 2.7 V 0.1 mA VCC = MAX, VIN = 7.0 V - 0.4 mA VCC = MAX, VIN = 0.4 V -100 mA VCC = MAX 13 mA VCC = MAX Typ Max Unit - 20 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 Min Parameter Test Conditions tPLH tPHL Propagation Delay (2 Levels) 15 15 25 25 ns Figure 2 tPLH tPHL Propagation Delay (3 Levels) 20 20 30 30 ns Figure 1 VCC = 5.0 V CL = 15 pF AC WAVEFORMS VIN VOUT 1.3 V 1.3 V tPHL tPLH 1.3 V VIN 1.3 V 1.3 V tPLH tPHL VOUT 1.3 V Figure 1 1.3 V 1.3 V Figure 2 FAST AND LS TTL DATA 5-55