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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/HCT7541 Octal Schmitt trigger buffer/line driver; 3-state Product specification Supersedes data of March 1988 File under Integrated Circuits, IC06 December 1990 Philips Semiconductors Product specification Octal Schmitt trigger buffer/line driver; 3-state FEATURES * Non-inverting outputs * Schmitt trigger action on all data inputs * Output capability: bus driver * ICC category: MSI GENERAL DESCRIPTION The 74HC/HCT7541 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/HCT7541 The 74HC/HCT7541 are octal Schmitt trigger non-inverting buffer/line drivers with 3-state outputs. The 3-state outputs are controlled by the output enable inputs OE1 and OE2. A HIGH on OEn causes the outputs to assume a high impedance OFF-state. The Schmitt trigger action in the data inputs transforms slowly changing input signals into sharply defined jitter-free output signals. The "7541" is identical to the "541" but has hysteresis on the data inputs. 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 buffer notes 1 and 2 CONDITIONS HC CL = 15 pF; VCC = 5 V 10 3.5 30 HCT 16 3.5 32 ns pF pF UNIT December 1990 2 Philips Semiconductors Product specification Octal Schmitt trigger buffer/line driver; 3-state PIN DESCRIPTION PIN NO. 1, 19 2, 3, 4, 5, 6, 7, 8, 9 10 18, 17, 16, 15, 14, 13, 12, 11 20 SYMBOL OE1, OE2 A0 to A7 GND Y0 to Y7 VCC NAME AND FUNCTION 74HC/HCT7541 output enable inputs (active LOW) data inputs ground (0 V) bus outputs positive supply voltage Fig.1 Pin configuration. Fig.2 Logic symbol. Fig.3 IEC logic symbol. December 1990 3 Philips Semiconductors Product specification Octal Schmitt trigger buffer/line driver; 3-state FUNCTION TABLE INPUTS OE1 L L X H Notes 1. H = HIGH voltage level L = LOW voltage level X = don't care Z = high impedance OFF-state OE2 L L H X An L H X X OUTPUTS Yn L H Z Z 74HC/HCT7541 Fig.4 Functional diagram. Fig.5 Logic diagram. December 1990 4 Philips Semiconductors Product specification Octal Schmitt trigger buffer/line driver; 3-state DC CHARACTERISTICS FOR 74HC For the DC characteristics see "74HC/HCT/HCU/HCMOS Logic Family Specifications". Transfer characteristics are given below (not applicable for OEn inputs). Output capability: bus driver ICC category: MSI AC CHARACTERISTICS FOR 74HC GND = 0 V; tr = tf = 6 ns; CL = 50 pF Tamb (C) 74HC SYMBOL PARAMETER +25 -40 to +85 -40 to +125 max. 180 36 32 240 48 41 240 48 41 90 18 15 ns 74HC/HCT7541 TEST CONDITIONS UNIT V CC WAVEFORMS (V) 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 Fig.8 min. typ. max. min. max. min. tPHL/ tPLH propagation delay An to Yn 3-state output enable time OEn to Yn 3-state output disable time OEn to Yn output transition time 39 14 11 44 16 13 58 21 17 14 5 4 120 24 20 160 32 27 160 32 27 60 12 10 150 30 26 200 40 34 200 40 34 75 15 13 tPZH/ tPZL ns Fig.8 tPHZ/ tPLZ ns Fig.8 tTHL/ tTLH ns Fig.8 TRANSFER CHARACTERISTICS FOR 74HC Voltages are referred to GND (ground = 0 V) Tamb (C) 74HC SYMBOL PARAMETER min. VT+ positive-going threshold +25 -40 to +85 -40 to +125 UNIT V CC WAVEFORMS (V) V 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 Figs 6 and 7 TEST CONDITIONS typ. max. min. max. min. max. 1.50 3.15 4.20 1.50 3.15 4.20 0.30 1.35 1.80 0.20 0.40 0.50 0.10 0.25 0.30 0.30 1.35 1.80 0.10 0.25 0.30 1.50 3.15 4.20 VT- negative-going threshold 0.30 1.35 1.80 0.10 0.25 0.30 V Figs 6 and 7 VH hysteresis (VT+ - VT-) V Figs 6 and 7 December 1990 5 Philips Semiconductors Product specification Octal Schmitt trigger buffer/line driver; 3-state DC CHARACTERISTICS FOR 74HCT For the DC characteristics see "74HC/HCT/HCU/HCMOS Logic Family Specifications". Transfer characteristics are given below (not applicable for OEn inputs). Output capability: bus driver ICC category: MSI 74HC/HCT7541 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 OE1 OE2 An UNIT LOAD COEFFICIENT 1.30 1.30 0.20 AC CHARACTERISTICS FOR 74HCT GND = 0 V; tr = tf = 6 ns; CL = 50 pF Tamb (C) 74HCT SYMBOL PARAMETER +25 -40 to +85 -40 to +125 min. max. 48 48 48 18 ns ns ns ns 4.5 4.5 4.5 4.5 Fig.8 Fig.8 Fig.8 Fig.8 UNIT V CC WAVEFORMS (V) TEST CONDITIONS min typ. max min. max tPHL/ tPLH tPZH/ tPZL tPHZ/ tPLZ tTHL/ tTLH propagation delay An to Yn 3-state output enable time OEn to Yn 3-state output disable time OEn to Yn output transition time 19 18 20 5 32 32 32 12 40 40 40 15 TRANSFER CHARACTERISTICS FOR 74HCT Voltages are referred to GND (ground = 0 V) Tamb (C) 74HCT SYMBOL PARAMETER +25 min. typ. VT+ VT- VH positive-going threshold negative-going threshold hysteresis (VT+ - VT-) 0.70 0.80 0.17 0.17 0.23 0.23 -40 to +85 max. min. max. 2.0 2.1 0.64 0.74 2.0 2.1 0.60 0.70 -40 to +125 min. max. 2.0 2.1 V V V 4.5 5.5 4.5 5.5 4.5 5.5 Figs 6 and 7 Figs 6 and 7 Figs 6 and 7 UNIT V CC WAVEFORMS (V) TEST CONDITIONS December 1990 6 Philips Semiconductors Product specification Octal Schmitt trigger buffer/line driver; 3-state TRANSFER CHARACTERISTIC WAVEFORMS handbook, halfpage 74HC/HCT7541 VO MBA325 VH VT VT VI Fig.6 Transfer characteristic. Fig.7 Waveforms showing the definition of VT+, VT- and VH. AC WAVEFORMS (1) HC : VM = 50%; VI = GND to VCC. HCT: VM = 1.3 V; VI = GND to 3 V. Fig.8 Waveforms showing the input (An) to output (Yn) propagation delays and the output transition times. (1) HC : VM = 50%; VI = GND to VCC. HCT: VM = 1.3 V; VI = GND to 3 V. Fig.9 Waveforms showing the 3-state enable and disable times. PACKAGE OUTLINES See "74HC/HCT/HCU/HCMOS Logic Package Outlines". December 1990 7 This datasheet has been download from: www..com Datasheets for electronics components. |
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