器件名称:
M74HC251
功能描述:
8-CHANNEL MULTIPLEXER (3-STATE)
文件大小:
379.99KB 共11页
简 介:
M74HC251 8-CHANNEL MULTIPLEXER (3-STATE) s s s s s s s HIGH SPEED : tPD = 17 ns (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 251 DIP SOP TSSOP ORDER CODES PACKAGE DIP SOP TSSOP TUBE M74HC251B1R M74HC251M1R T&R M74HC251RM13TR M74HC251TTR DESCRIPTION The M74HC251 is an high speed CMOS 8-CHANNEL MULTIPLEXER (3-STATE) fabricated with silicon gate C2MOS technology. This Multiplexer features both true (Y) and complement (W) outputs as well as STROBE input. When the STROBE is high, both outputs are in the high impedance state. When enabled, address information on the data select inputs determines which data input is routed to Y and W. All inputs are equipped with protection circuits against static discharge and transient excess voltage. PIN CONNECTION AND IEC LOGIC SYMBOLS July 2001 1/11 M74HC251 INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION PIN No 4, 3, 2, 1, 15, 14, 13, 12 5 6 7 11, 10, 9 8 16 SYMBOL D0 to D7 Y W STROBE A, B, C GND Vcc NAME AND FUNCTION Multiplexer Inputs Multiplexer Output Complementary Multiplexer Output 3 State Output Enable Input Select Inputs Ground (0V) Positive Supply Voltage TRUTH TABLE INPUTS STROBE Y C X L L L L H H H H X : Don’t Care Z : High Impedance OUTPUTS W Z D0 D1 ……
