器件名称:
M74HC688
功能描述:
8 BIT EQUALITY COMPARATOR
文件大小:
243.3KB 共10页
简 介:
M54HC688 M74HC688 8 BIT EQUALITY COMPARATOR . . . . . . . . HIGH SPEED tPD = 17 ns (TYP.) AT VCC = 5 V LOW POWER DISSIPATION ICC = 4 A (MAX.) AT TA = 25 °C HIGH NOISE IMMUNITY VNIH = VNIL = 28 % VCC (MIN.) OUTPUT DRIVE CAPABILITY 10 LSTTL LOADS SYMMETRICAL OUTPUT IMPEDANCE |IOH| = IOL = 4 mA (MIN.) BALANCED PROPAGATION DELAYS tPLH = tPHL WIDE OPERATING VOLTAGE RANGE VCC (OPR) = 2 V TO 6 V PIN AND FUNCTION COMPATIBLE WITH 54/74LS688 B1R (Plastic Package) F1R (Ceramic Package) M1R (Micro Package) C1R (Chip Carrier) ORDER CODES : M54HC688F1R M74HC688M1R M74HC688B1R M74HC688C1R PIN CONNECTIONS (top view) DESCRIPTION The M54/74HC688 utilizes silicon gate C2MOS technology to achieve operating speeds equivalent to LSTTL devices. Along with the low power dissi2 pation and high noise immunity of standard C MOS integrated circuit, it possesses the driving capability of 10 LSTTL load. The M54/74HC688 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 circuit against static discharge and transient excess voltage. October 1992 NC = No Internal Connection 1/10 M54/M74HC688 INPUT AND OUTPUT EQUIVALENT CIRCUIT TRUTH TABLE INPUT P, Q P=Q P≠Q X X: DON’T CARE OUTPUT G L L H P=Q L H H LOGIC DIAGRAM 2/10 M54/M74HC688 PIN DESCRIPTION PI……
