74HCT7245

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/HCT7245 Octal bus Schmitt-trigger transceiver; 3-state Product specification File under Integrated Circuits, IC06 December 1990 Philips Semiconductors Product specification Octal bus Schmitt-trigger transceiver; 3-state FEATURES • Octal bidirectional bus interface • Non-inverting 3-state outputs • Output capability: bus driver • ICC category: MSI • Schmitt-trigger action on all data inputs GENERAL DESCRIPTION The 74HC/HCT7245 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 74HC/HCT7245 are octal transceivers featuring non-inverting 3-state bus compatible outputs in both send and receive directions. The “7245” features an output enable (OE) input for easy cascading and a send/receive input (DIR) for direction control. OE controls the outputs so that the buses are effectively isolated. The 74HC/HCT7245 have Schmitt-trigger inputs. These inputs are capable of transforming slowly changing input signals into sharply defined jitter-free output signals. 74HC/HCT7245 The “7245” is identical to the “245” but has hysteresis on the data inputs. FUNCTION TABLE INPUTS OE L L H Notes 1. H = HIGH voltage level L = LOW voltage level X = don’t care Z = high impedance OFF-state DIR L H X INPUTS/OUTPUTS An A=B inputs Z Bn inputs B=A Z QUICK REFERENCE DATA GND = 0 V; Tamb = 25 °C; tr = tf = 6 ns TYPICAL SYMBOL tPHL/ tPLH CI CI/O 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”. PARAMETER propagation delay An to Bn input capacitance input/output capacitance power dissipation capacitance per transceiver notes 1 and 2 CONDITIONS HC CL = 15 pF; VCC = 5 V 8 3.5 10 40 HCT 12 3.5 10 40 ns pF pF pF UNIT December 1990 2 Philips Semiconductors Product specification Octal bus Schmitt-trigger transceiver; 3-state PIN DESCRIPTION PIN NO. 1 2, 3, 4, 5, 6, 7, 8, 9 10 18, 17, 16, 15, 14, 13, 12, 11 19 20 SYMBOL DIR A0 to A7 GND B0 to B7 OE VCC NAME AND FUNCTION direction control data inputs/outputs ground (0 V) data inputs/outputs 74HC/HCT7245 output enable input (active LOW) positive supply voltage alfpage ge DIR A0 A1 A2 A3 A4 A5 A6 A7 1 2 3 4 5 20 VCC 19 OE 19 OE age 19 1 1 18 B 0 17 B 1 16 B 2 2 DIR G3 3EN1 3EN2 A0 B0 18 2 3 4 5 1 2 18 17 16 15 14 13 12 11 MBA404 7245 6 7 8 9 15 B 3 14 B 4 13 B 5 12 B 6 11 B 7 MBA327 MBA330 9 A7 B7 6 11 7 8 9 GND 10 Fig.1 Pin configuration. Fig.2 Functional diagram. Fig.3 IEC logic symbol. December 1990 3 Philips Semiconductors Product specification Octal bus Schmitt-trigger transceiver; 3-state DC CHARACTERISTICS FOR 74HC For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”. Output capability: bus driver ICC category: MSI 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 74HC/HCT7245 TEST CONDITIONS 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. 4 and 5 typ. max. min. max. min. max. 1.50 3.15 4.20 1.50 3.15 4.20 0.30 1.35 1.80 0.2 0.4 0.5 0.1 0.25 0.3 0.30 1.35 1.80 0.1 0.25 0.3 1.50 3.15 4.20 V T− negative-going threshold 0.30 1.35 1.80 0.1 0.25 0.3 V Figs. 4 and 5 VH hysteresis (VT+ − VT−) V Figs. 4 and 5 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. 150 30 26 240 48 41 240 48 41 90 18 15 ns 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.7 UNIT V CC WAVEFORMS (V) TEST CONDITIONS min. typ. max. min. max. min. tPHL/ tPLH propagation delay An to Bn; Bn to An 3-state output enable time OE to An; OE to Bn 3-state output disable time OE to An; OE to Bn output transition time 33 12 10 47 17 14 52 19 16 14 5 4 100 20 17 160 32 27 160 32 27 60 12 10 125 25 21 200 40 34 200 40 34 75 15 13 tPZH/ tPZL ns Fig.7 tPHZ/ tPLZ ns Fig.7 tTHL/ tTLH ns Fig.7 December 1990 4 Philips Semiconductors Product specification Octal bus Schmitt-trigger transceiver; 3-state DC CHARACTERISTICS FOR 74HCT For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”. Output capability: bus driver ICC category: MSI Note to HCT types 74HC/HCT7245 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 Bn OE DIR UNIT LOAD COEFFICIENT 0.33 0.33 1.50 1.00 TRANSFER CHARACTERISTICS FOR 74HCT Voltages are referred to GND (ground = 0 V) Tamb (°C) 74HCT SYMBOL PARAMETER min. VT + V T− VH positive-going threshold negative-going threshold hysteresis (VT+ − VT−) 0.7 0.8 0.17 0.17 0.23 0.23 +25 −40 to +85 −40 to +125 UNIT V CC WAVEFORMS (V) V V V 4.5 5.5 4.5 5.5 4.5 5.5 Figs. 4 and 5 Figs. 4 and 5 Figs. 4 and 5 TEST CONDITIONS typ. max. min. max. min. max. 2.0 2.1 0.64 0.74 2.0 2.1 0.6 0.7 2.0 2.1 December 1990 5 Philips Semiconductors Product specification Octal bus Schmitt-trigger transceiver; 3-state 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 max. 45 ns 74HC/HCT7245 TEST CONDITIONS UNIT V CC WAVEFORMS (V) 4.5 Fig.7 min. typ. max. min. max. min. tPHL/ tPLH propagation delay An to Bn; Bn to An 3-state output enable time OE to An; OE to Bn 3-state output disable time OE to An; OE to Bn output transition time 17 30 37 tPZH/ tPZL 19 32 40 48 ns 4.5 Fig.7 tPHZ/ tPLZ 19 32 40 48 ns 4.5 Fig.7 tTHL/ tTLH 5 12 15 18 ns 4.5 Fig.7 TRANSFER CHARACTERISTIC WAVEFORMS handbook, halfpage VO MBA325 handbook, halfpage VI VT VT V H V H VT VT VI VO MBA324 Fig.4 Transfer characteristic. Fig.5 Waveforms showing the definition of VT+, VT − and VH. December 1990 6 Philips Semiconductors Product specification Octal bus Schmitt-trigger transceiver; 3-state AC WAVEFORMS 74HC/HCT7245 (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, Bn) to output (Bn, An) propagation delays and the output transition times. handbook, full pagewidth tr 90 % OE n INPUT 10 % t PLZ OUTPUT LOW - to - OFF OFF - to - LOW t PHZ OUTPUT HIGH - to - OFF OFF - to - HIGH outputs enabled 90 % VM (1) tf t PZL V M (1) 10 % t PZH VM outputs disabled (1) MBA322 outputs enabled (1) HC : VM = 50%; VI = GND to VCC. HCT: VM = 1.3 V; VI = GND to 3 V. Fig.7 Waveforms showing the 3-state enable and disable times. PACKAGE OUTLINES See “74HC/HCT/HCU/HCMOS Logic Package Outlines”. December 1990 7