器件名称:
M74HC688RM13TR
功能描述:
8 BIT EQUALITY COMPARATOR
文件大小:
326.1KB 共9页
简 介:
M74HC688 8 BIT EQUALITY COMPARATOR s s s s s s s HIGH SPEED: tPD = 17ns (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 688 DIP SOP TSSOP ORDER CODES PACKAGE DIP SOP TSSOP TUBE M74HC688B1R M74HC688M1R T&R M74HC688RM13TR M74HC688TTR DESCRIPTION The M74HC688 is an high speed CMOS 8 BIT EQUALITY COMPARATOR fabricated with silicon gate C2MOS technology. The M74HC688 compares bit for bit two 8-bit words applied on inputs P0 - P7 and inputs Q0 Q7 and indicates whether or not they are equal. A single active low enable is provided to facilitate cascading several packages to enable comparison of words greater than 8 bits. All inputs are equipped with protection circuits against static discharge and transient excess voltage. PIN CONNECTION AND IEC LOGIC SYMBOLS July 2001 1/9 M74HC688 INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION PIN No 1 2, 4, 6, 8, 11, 13, 15, 17 3, 5, 7, 9, 12, 14, 16, 18 19 10 20 SYMBOL G P0 to P7 Q0 to Q7 P=Q GND VCC NAME AND FUNCTION Enable Input (Active LOW) Word Inputs Word Outputs Equal to Output Ground (0V) Positive Supply Voltage TRUTH TABLE INPUTS P, Q P=Q P <> Q X X: Don’t Care OUTPUT G L L H P=Q L H H LOGIC DIAGRAM This logic diagram has not be used to estimate propagation ……
