M74HC85

M 54HC85 M74HC85 4-BIT MAGNITUDE COMPARATOR . . . . . . . . HIGH SPEED tPD = 22 ns (TYP.) at VCC = 5 V LOW POWER DISSIPATION ICC = 4 µA (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 54/74LS85 B1R (Plastic Package) F1R (Ceramic Package) M1R (Micro Package) C1R (Chip Carrier) ORDER CODES : M54HC85F1R M74HC85M1R M74HC85B1R M74HC85C1R DESCRIPTION The M54/74HC85 is a high speed CMOS 4-BIT MAGNITUDE COMPARATOR fabricated in silicon gate C2MOS technology. It has the same high speed performance of LSTTL combined with true CMOS low power consumption. This comparator compares two 4-bit words and provides a high voltage level on one of the A > B out, A = B out and A < B out outputs. The comparing bit number is easily expanded by cascading several devices as shown in the typical application. All inputs are equipped with protection circuits against static discharge and transient excess voltage. INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN CONNECTIONS (top view) NC = No Internal Connection December 1992 1/11 M54/M74HC85 P IN DESCRIPTION PIN No 2 3 4 5 6 7 9, 11, 14, 1 10, 12, 13, 15 8 16 SYMBOL IN AB OUTA>B OUTA=B OUTAB Expansion Output A=B Expansion Output AB3 A3=B3 A3=B3 A3=B3 X A2>B2 A2=B2 A2=B2 X X A1>B1 A1=B1 X X X A0>B0 CASCADING INPUTS A>B X X X X L X A3=B3 A2=B2 A1=B1 A0=B0 L H A3=B3 A3=B3 A3=B3 A3B H H H H H L L H L L L L L A