器件名称:
M74HC148RM13TR
功能描述:
8 TO 3 LINE PRIORITY ENCODER
文件大小:
329.46KB 共11页
简 介:
M74HC148 8 TO 3 LINE PRIORITY ENCODER s s s s s s s HIGH SPEED: tPD = 16ns (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 148 DIP SOP TSSOP ORDER CODES PACKAGE DIP SOP TSSOP TUBE M74HC148B1R M74HC148M1R T&R M74HC148RM13TR M74HC148TTR DESCRIPTION The M74HC148 is an high speed CMOS 8 TO 3 LINE PRIORITY ENCODER fabricated with silicon gate C2MOS technology. The M74HC148 encodes eight data lines to three-line (4-2-1) binary (octal). Cascading circuitry (enable input EI and enable output EO) has been provided to allow octal expansion without the need for external circuitry. Data inputs are active at the low logic level. All inputs are equipped with protection circuits against static discharge and transient excess voltage. PIN CONNECTION AND IEC LOGIC SYMBOLS July 2001 1/11 M74HC148 INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION PIN No 9, 7, 6 10, 11, 12, 13, 1, 2, 3, 4 15 5 14 8 16 SYMBOL A0 to A2 0 to 7 EO EI GS GND VCC NAME AND FUNCTION Data Outputs Data Inputs Enable Output Enable Input Priority Flag Output Ground (0V) Positive Supply Voltage TRUTH TABLE INPUTS E1 H L L L L L L L L L 0 X H X X X X X X X L 1 X H X X X X X X L H 2 X H X X X X X L H H 3 X H X X X X L H H H 4 X H X X X L H H H H 5 X H ……
