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/HCT137 3-to-8 line decoder/demultiplexer with address latches; inverting Product specification File under Integrated Circuits, IC06 December 1990 Philips Semiconductors Product specification 3-to-8 line decoder/demultiplexer with address latches; inverting 74HC/HCT137 The 74HC/HCT137 are 3-to-8 line decoder/demultiplexers with latches at the three address inputs (An). The “137” essentially combines the 3-to-8 decoder function with a 3-bit storage latch. When the latch is enabled (LE = LOW), the “137” acts as a 3-to-8 active LOW decoder. When the latch enable (LE) goes from LOW-to-HIGH, the last data present at the inputs before this transition, is stored in the latches. Further address changes are ignored as long as LE remains HIGH. FEATURES • Combines 3-to-8 decoder with 3-bit latch • Multiple input enable for easy expansion or independent controls • Active LOW mutually exclusive outputs • Output capability: standard • ICC category: MSI The output enable input (E1 and E2) controls the state of the outputs independent of the address inputs or latch operation. All outputs are HIGH unless E1 is LOW and E2 is HIGH. GENERAL DESCRIPTION The 74HC/HCT137 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. The “137” is ideally suited for implementing non-overlapping decoders in 3-state systems and strobed (stored address) applications in bus oriented systems. QUICK REFERENCE DATA GND = 0 V; Tamb= 25 °C; tr = tf = 6 ns TYPICAL SYMBOL tPHL/ tPLH PARAMETER CONDITIONS HCT An to Yn 18 19 ns LE to Yn 17 21 ns E1 to Yn 15 17 ns E2 to Yn 15 15 ns 3.5 3.5 pF 57 59 pF propagation delay CL = 15 pF; VCC = 5 V CI input capacitance CPD power dissipation capacitance per package notes 1 and 2 Notes 1. CPD is used to determine the dynamic power dissipation (PD in µW): PD = CPD × VCC2 × fi + ∑ (CL × VCC2 × fo) where: fi = input frequency in MHz fo = output frequency in MHz ∑ (CL × VCC2 × 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”. December 1990 UNIT HC 2 Philips Semiconductors Product specification 3-to-8 line decoder/demultiplexer with address latches; inverting 74HC/HCT137 PIN DESCRIPTION PIN NO. SYMBOL NAME AND FUNCTION 1, 2, 3 A0 to A2 data inputs 4 LE latch enable input (active LOW) 5 E1 data enable input (active LOW) 6 E2 data enable input (active HIGH) 8 GND ground (0 V) 15, 14, 13, 12, 11, 10, 9, 7 Y0 to Y7 multiplexer outputs 16 VCC positive supply voltage December 1990 Fig.1 Pin configuration. Fig.2 Logic symbol. Fig.3 IEC logic symbol. Fig.4 Functional diagram. 3 Philips Semiconductors Product specification 3-to-8 line decoder/demultiplexer with address latches; inverting 74HC/HCT137 FUNCTION TABLE INPUTS LE E1 E2 OUTPUTS A0 A1 A2 Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 H L H X X X stable X X H X X L X X X X X X H H H H H H H H H H H H H H H H L L L L L L L L H H H H L H L H L L H H L L L L L H H H H L H H H H L H H H H L H H H H H H H H H H H H H H H H L L L L L L L L H H H H L H L H L L H H H H H H H H H H H H H H H H H H H H H H L H H H H L H H H H L H H H H L Notes 1. H = HIGH voltage level L = LOW voltage level X = don’t care Fig.5 Logic diagram. December 1990 4 Philips Semiconductors Product specification 3-to-8 line decoder/demultiplexer with address latches; inverting 74HC/HCT137 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) TEST CONDITIONS 74HC SYMBOL PARAMETER +25 min. typ. −40 to +85 max. min. max. −40 to +125 min. UNIT VCC WAVEFORMS (V) max. tPHL/ tPLH propagation delay An to Yn 58 21 17 180 36 31 225 45 38 270 54 46 ns 2.0 4.5 6.0 Fig.6 tPHL/ tPLH propagation delay LE to Yn 55 20 16 190 38 32 240 48 41 285 57 48 ns 2.0 4.5 6.0 Fig.7 tPHL/ tPLH propagation delay E1 to Yn 50 18 14 145 29 25 180 36 31 220 44 38 ns 2.0 4.5 6.0 Fig.7 tPHL/ tPLH propagation delay E2 to Yn 50 18 14 145 29 25 180 36 31 220 44 38 ns 2.0 4.5 6.0 Fig.6 tTHL/ tTLH output transition time 19 7 6 75 15 13 95 19 16 110 22 19 ns 2.0 4.5 6.0 Fig.6 tW LE pulse width HIGH 50 10 9 11 4 3 65 13 11 75 15 13 ns 2.0 4.5 6.0 Fig.8 tsu set-up time An to LE 50 10 9 3 1 1 65 13 11 75 15 13 ns 2.0 4.5 6.0 Fig.8 th hold time An to LE 30 6 5 3 1 1 40 8 7 45 9 8 ns 2.0 4.5 6.0 Fig.8 December 1990 5 Philips Semiconductors Product specification 3-to-8 line decoder/demultiplexer with address latches; inverting 74HC/HCT137 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 UNIT LOAD COEFFICIENT An 1.50 E1 1.50 E2 1.50 LE 1.50 AC CHARACTERISTICS FOR 74HCT GND = 0 V; tr = tf = 6 ns; CL = 50 pF Tamb (°C) TEST CONDITIONS 74HCT SYMBO L PARAMETER +25 min. −40 to +85 typ. max. min. max. −40 to +125 min. UNIT VCC WAVEFORMS (V) max. tPHL/ tPLH propagation delay An to Yn 22 38 48 57 ns 4.5 Fig.6 tPHL/ tPLH propagation delay LE to Yn 25 44 55 66 ns 4.5 Fig.7 tPHL/ tPLH propagation delay E1 to Yn 20 37 46 56 ns 4.5 Fig.7 tPHL/ tPLH propagation delay E2 to Yn 18 35 44 53 ns 4.5 Fig.6 7 15 19 22 ns 4.5 Fig.6 tTHL/ tTLH output transition time LE pulse width HIGH 10 5 13 15 ns 4.5 Fig.8 tsu set-up time An to LE 10 2 13 15 ns 4.5 Fig.8 th hold time An to LE 7 2 9 11 ns 4.5 Fig.8 tW December 1990 6 Philips Semiconductors Product specification 3-to-8 line decoder/demultiplexer with address latches; inverting 74HC/HCT137 AC WAVEFORMS (1) HC : VM = 50%; VI = GND to VCC. HCT: VM = 1.3 V; VI = GND to 3 V. (1) HC : VM = 50%; VI = GND to VCC. HCT: VM = 1.3 V; VI = GND to 3 V. Fig.6 Fig.7 Waveforms showing the address input (An) and enable inputs (E2) to output (Yn) propagation delays and the output transition times. Waveforms showing the enable input (E1, LE) to output (Yn) propagation delays and the output transition times. The shaded areas indicate when the input is permitted to change for predictable output performance. (1) HC : VM = 50%; VI = GND to VCC. HCT: VM = 1.3 V; VI = GND to 3 V. Fig.8 Waveforms showing the data set-up, hold times for An input to LE input and the latch enable pulse width. APPLICATION INFORMATION Fig.9 6-to-64 line decoder with input address storage. December 1990 7 Philips Semiconductors Product specification 3-to-8 line decoder/demultiplexer with address latches; inverting PACKAGE OUTLINES See “74HC/HCT/HCU/HCMOS Logic Package Outlines”. December 1990 8 74HC/HCT137