器件名称: 74AHC244PW
功能描述: Octal buffer/line driver; 3-state
文件大小: 80.83KB 共16页
简 介:INTEGRATED CIRCUITS
DATA SHEET
74AHC244; 74AHCT244 Octal buffer/line driver; 3-state
Product specication Supersedes data of 1999 Feb 24 File under Integrated Circuits, IC06 1999 Sep 28
Philips Semiconductors
Product specication
Octal buffer/line driver; 3-state
FEATURES ESD protection: HBM EIA/JESD22-A114-A exceeds 2000 V MM EIA/JESD22-A115-A exceeds 200 V CDM EIA/JESD22-C101 exceeds 1000 V Balanced propagation delays All inputs have a Schmitt-trigger action Inputs accepts voltages higher than VCC For AHC only: operates with CMOS input levels For AHCT only: operates with TTL input levels Specified from 40 to +85 and +125 °C. DESCRIPTION The 74AHC/AHCT244 is a high-speed Si-gate CMOS device. The 74AHC/AHCT244 is an octal non-inverting buffer/line driver with 3-state outputs. The 3-state outputs are controlled by the outputs enable inputs 1OE and 2OE. A HIGH on nOE causes the outputs to assume a high-impedance OFF state. CI CO CPD Note 1. H = HIGH voltage level; L = LOW voltage level; X = don’t care; Z = high-impedance OFF state. FUNCTION TABLE See note 1. INPUTS nOE L L H
74AHC244; 74AHCT244
OUTPUT nAn L H X nYn L H Z
QUICK REFERENCE DATA GND = 0 V; Tamb = 25 °C; tr = tf ≤ 3.0 ns. TYPICAL SYMBOL tPHL/tPLH PARAMETER propagation delay 1An to 1Yn; 2An to 2Yn input capacitance output capacitance power dissipation capacitance CL = 50 pF; f = 1 MHz; notes 1 and 2 CONDITIONS AHC CL = 15 pF; VCC = 5 V VI = VCC or GND 3.5 AHCT 5.0 ns UNIT
3.5 4.0 10
3.5 4.0 12
pF pF ……
