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| INTEGRATED CIRCUITS DATA SHEET For a complete data sheet, please also download: * The IC06 74HC/HCT/HCU/HCMOS Logic Family Specifications * The IC06 74HC/HCT/HCU/HCMOS Logic Package Information * The IC06 74HC/HCT/HCU/HCMOS Logic Package Outlines 74HC/HCT42 BCD to decimal decoder (1-of-10) Product specification File under Integrated Circuits, IC06 December 1990 Philips Semiconductors Product specification BCD to decimal decoder (1-of-10) FEATURES * Mutually exclusive outputs * 1-of-8 demultiplexing capability * Outputs disabled for input codes above nine * Output capability: standard * ICC category: MSI GENERAL DESCRIPTION The 74HC/HCT42 are high-speed Si-gate CMOS devices and are pin compatible with low power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard no. 7A. QUICK REFERENCE DATA GND = 0 V; Tamb = 25 C; tr = tf = 6 ns 74HC/HCT42 The 74HC/HCT42 decoders accept four active HIGH BCD inputs and provide 10 mutually exclusive active LOW outputs. The active LOW outputs facilitate addressing other MSI circuits with active LOW input enables. The logic design of the "42" ensures that all outputs are HIGH when binary codes greater than nine are applied to the inputs. The most significant input (A3) produces an useful inhibit function when the "42" is used as a 1-of-8 decoder. The A3 input can also be used as the data input in an 8-output demultiplexer application. TYPICAL SYMBOL tPHL/ tPLH CI CPD Notes 1. CPD is used to determine the dynamic power dissipation (PD in W): PD = CPD x VCC2 x fi + (CL x VCC2 x fo) where: fi = input frequency in MHz fo = output frequency in MHz (CL x VCC2 x fo) = sum of outputs CL = output load capacitance in pF VCC = supply voltage in V 2. For HC the condition is VI = GND to VCC For HCT the condition is VI = GND to VCC - 1.5 V ORDERING INFORMATION See "74HC/HCT/HCU/HCMOS Logic Package Information". PARAMETER propagation delay An to Yn input capacitance power dissipation capacitance per package notes 1 and 2 CONDITIONS HC CL = 15 pF; VCC = 5 V 14 3.5 37 HCT 17 3.5 37 ns pF pF UNIT December 1990 2 Philips Semiconductors Product specification BCD to decimal decoder (1-of-10) PIN DESCRIPTION PIN NO. 1, 2, 3, 4, 5, 6, 7, 9, 10, 11 8 15, 14, 13, 12 16 SYMBOL Y0 to Y9 GND A0 to A3 VCC 74HC/HCT42 NAME AND FUNCTION multiplexer outputs ground (0 V) data inputs positive supply voltage Fig.1 Pin configuration. Fig.2 Logic symbol. Fig.3 IEC logic symbol. December 1990 3 Philips Semiconductors Product specification BCD to decimal decoder (1-of-10) FUNCTION TABLE INPUTS A3 L L L L L L L L H H H H H H H H Note 1. H = HIGH voltage level L = LOW voltage level A2 L L L L H H H H L L L L H H H H A1 L L H H L L H H L L H H L L H H A0 L H L H L H L H L H L H L H L H Y0 L H H H H H H H H H H H H H H H Y1 H L H H H H H H H H H H H H H H Y2 H H L H H H H H H H H H H H H H Y3 H H H L H H H H H H H H H H H H 74HC/HCT42 OUTPUTS Y4 H H H H L H H H H H H H H H H H Y5 H H H H H L H H H H H H H H H H Y6 H H H H H H L H H H H H H H H H Y7 H H H H H H H L H H H H H H H H Y8 H H H H H H H H L H H H H H H H Y9 H H H H H H H H H L H H H H H H Fig.4 Functional diagram. Fig.5 Logic diagram. December 1990 4 Philips Semiconductors Product specification BCD to decimal decoder (1-of-10) DC CHARACTERISTICS FOR 74HC For the DC characteristics see "74HC/HCT/HCU/HCMOS Logic Family Specifications". Output capability: standard ICC category: MSI AC CHARACTERISTICS FOR 74HC GND = 0 V; tr = tf = 6 ns; CL = 50 pF Tamb (C) 74HC SYMBOL PARAMETER +25 min. typ. tPHL/ tPLH propagation delay An to Yn output transition time 47 17 14 19 7 6 max. 150 30 26 75 15 13 -40 to +85 min. max. 190 38 33 95 19 16 -40 to +125 min. max. 225 45 38 110 22 19 ns UNIT 74HC/HCT42 TEST CONDITIONS VCC WAVEFORMS (V) 2.0 4.5 6.0 2.0 4.5 6.0 Fig.6 tTHL/ tTLH ns Fig.6 DC CHARACTERISTICS FOR 74HCT For the DC characteristics see "74HC/HCT/HCU/HCMOS Logic Family Specifications". Output capability: standard ICC category: MSI Note to HCT types The value of additional quiescent supply current (ICC) for a unit load of 1 is given in the family specifications. To determine ICC per input, multiply this value by the unit load coefficient shown in the table below. INPUT An UNIT LOAD COEFFICIENT 1.0 AC CHARACTERISTICS FOR 74HCT GND = 0 V; tr = tf = 6 ns; CL = 50 pF Tamb (C) 74HCT SYMBOL PARAMETER min. tPHL/ tPLH tTHL/ tTLH propagation delay An to Yn output transition time +25 typ. 20 7 max. 35 15 -40 to +85 min. max. 44 19 -40 to +125 min. max. 53 22 ns ns 4.5 4.5 Fig.6 Fig.6 UNIT VCC WAVEFORMS (V) TEST CONDITIONS December 1990 5 Philips Semiconductors Product specification BCD to decimal decoder (1-of-10) AC WAVEFORMS 74HC/HCT42 (1) HC : VM = 50%; VI = GND to VCC. HCT: VM = 1.3 V; VI = GND to 3 V. Fig.6 Waveforms showing the input (An) to output (Yn) propagation delays and the output transition times. PACKAGE OUTLINES See "74HC/HCT/HCU/HCMOS Logic Package Outlines". December 1990 6 |
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