M74HC298

M54HC298 M74HC298 QUAD 2 CHANNEL MULTIPLEXER/REGISTER . . . . . . . . HIGH SPEED fMAX = 73 MHz (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 54/74LS298 B1R (Plastic Package) F1R (Ceramic Package) M1R (Micro Package) C1R (Chip Carrier) DESCRIPTION The M54/74HC298 is a high speed CMOS QUAD 2CHANNEL MULTIPLEXER/REGISTER fabricated in silicon gate C 2MOS technology. It has the same high speed performance of LSTTL combined with true CMOS low power consumption. These circuits are controlled by the signals WORD SELECT and CLOCK. When the WORD SELECT input is taken low Word 1 (A1, B1, C1 and D1) is presented to the input of the flip-flops, and when WORD SELECT is high Word 2 (A2, B2, C2 and D2) is presented to the inputs of the flip-flops. The select word is clocked to the output terminals on the negative edge of the clock pulse. All inputs are equipped with protection circuits against static discharge and transient excess voltage. INPUT AND OUTPUT EQUIVALENT CIRCUIT ORDER CODES : M54HC298F1R M74HC298M1R M74HC298B1R M74HC298C1R PIN CONNECTIONS (top view) NC = No Internal Connection October 1992 1/11 M54/M74HC298 TRUTH TABLE INPUTS WORD SELECT L H X CLOCK QA a1 a2 QA0 QB b1 b2 QB0...