器件名称:
M74HC238
功能描述:
3 TO 8 LINE DECODER
文件大小:
298.5KB 共10页
简 介:
M74HC238 3 TO 8 LINE DECODER s s s s s s s HIGH SPEED: tPD = 15ns (TYP.) at VCC = 6V LOW POWER DISSIPATION: ICC = 4A(MAX.) at TA=25°C HIGH NOISE IMMUNITY: VNIH = V NIL = 28 % VCC (MIN.) SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 4mA (MIN) BALANCED PROPAGATION DELAYS: tPLH tPHL WIDE OPERATING VOLTAGE RANGE: VCC (OPR) = 2V to 6V PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 238 DIP SOP TSSOP ORDER CODES PACKAGE DIP SOP TSSOP TUBE M74HC238B1R M74HC238M1R T&R M74HC238RM13TR M74HC238TTR DESCRIPTION The M74HC238 is an high speed CMOS 3 TO 8 LINE DECODER fabricated with silicon gate C2MOS technology. If the device is enabled, 3 binary select inputs (A, B and C) determine which one of outputs will go high. When enable input G1 is held "Low" or either G2A or G2B is held "High" decoding function is inhibited and all the 8 outputs go low. Three enable inputs are provided to ease cascade connection and application of this address decoder in memory systems. All inputs are equipped with protection circuits against static discharge and transient excess voltage. PIN CONNECTION AND IEC LOGIC SYMBOLS July 2001 1/10 M74HC238 INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION PIN No 1, 2, 3 4, 5 6 15, 14, 13, 12, 11, 10, 9, 7 8 16 SYMBOL A, B, C G2A G2B G1 Y0 to Y7 NAME AND FUNCTION Data Inputs Enable Input (Active LOW) Data Enable Input (Active HIGH) Outputs GND VCC Ground (0V) Positive Supply Voltage TRUTH TABLE INPUTS OUTPUTS ENABLE G2B X X H L L L L L L L L G2A X H X L L……
