器件名称:
74HC244
功能描述:
Octal buffer/line driver; 3-state
文件大小:
39.17KB 共7页
简 介:
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/HCT244 Octal buffer/line driver; 3-state Product specication File under Integrated Circuits, IC06 December 1990 Philips Semiconductors Product specication Octal buffer/line driver; 3-state FEATURES Output capability: bus driver ICC category: MSI GENERAL DESCRIPTION The 74HC/HCT244 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/HCT244 The 74HC/HCT244 are octal non-inverting buffer/line drivers with 3-state outputs. The 3-state outputs are controlled by the output enable inputs 1OE and 2OE. A HIGH on nOE causes the outputs to assume a high impedance OFF-state. The “244” is identical to the “240” but has non-inverting outputs. TYPICAL SYMBOL tPHL/ tPLH PARAMETER propagation delay 1An to 1Yn; 2An to 2Yn input capacitance power dissipation capacitance per buffer notes 1 and 2 CONDITIONS HC CL = 15 pF; VCC = 5 V 9 HCT 11 ns UNIT CI CPD Notes 3.5 35 3.5 35 pF pF 1. CPD is used to determine the dynamic power dissipation (PD in W): PD = CPD × VCC2 × fi + ∑ (CL × VCC2 × fo) where: fi = input frequency in MHz fo = output frequency in MHz ∑ (CL × VCC2 × fo……
