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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/HCT7540 Octal Schmitt trigger buffer/line driver; 3-state; inverting
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; inverting
FEATURES • Inverting outputs • Schmitt trigger action on all data inputs • Output capability: bus driver • ICC category: MSI GENERAL DESCRIPTION The 74HC/HCT7540 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/HCT7540
The 74HC/HCT7540 are octal Schmitt trigger 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 “7540” is identical to the “540” but has hysteresis on the data inputs.
TYPICAL SYMBOL PARAMETER tPHL/ tPLH CI CPD 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”. propagation delay An to Yn input capacitance power dissipation capacitance per buffer notes 1 and 2 CONDITIONS HC CL = 15 pF; VCC = 5 V 11 3.5 29 HCT 16 3.5 31 ns pF pF UNIT
December 1990
2
Philips Semiconductors
Product specification
Octal Schmitt trigger buffer/line driver; 3-state; inverting
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 output enable inputs (active LOW) data inputs ground (0 V) bus outputs positive supply voltage
74HC/HCT7540
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; inverting
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 H L Z Z
74HC/HCT7540
Fig.4 Functional diagram.
Fig.5 Logic diagram.
December 1990
4
Philips Semiconductors
Product specification
Octal Schmitt trigger buffer/line driver; 3-state; inverting
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 min. typ. 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 41 15 12 52 19 15 14 5 4 −40 to +85 max. min. max. 120 24 20 150 30 26 150 30 26 60 12 10 150 30 26 190 38 33 190 38 33 75 15 13 −40 to +125 min. max. 180 36 31 225 45 38 225 45 38 90 18 15 ns
74HC/HCT7540
TEST CONDITIONS UNIT VCC 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
tPZH/ tPZL
ns
Fig.9
tPHZ/ tPLZ
ns
Fig.9
tTHL/ tTLH
ns
Fig.8
TRANSFER CHARACTERISTICS FOR 74HC Voltages are referred to GND (ground = 0 V) Tamb (°C) 74HC SYMBOL PARAMETER +25 min. typ. VT+ positive-going threshold max. 1.50 3.15 4.20 0.30 1.35 1.80 0.20 0.40 0.50 0.10 0.25 0.30 −40 to +85 min. max. 1.50 3.15 4.20 0.30 1.35 1.80 0.10 0.25 0.30 −40 to +125 min. max. 1.50 3.15 4.20 V 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 Figs 6 and 7 UNIT V CC WAVEFORMS (V) TEST CONDITIONS
VT −
negative-going threshold 0.30 1.35 1.80 hysteresis (VT+ − VT−) 0.10 0.25 0.30
V
Figs 6 and 7
VH
V
Figs 6 and 7
December 1990
5
Philips Semiconductors
Product specification
Octal Schmitt trigger buffer/line driver; 3-state; inverting
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/HCT7540
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.