HD74LV163A

HD74LV163A Synchronous 4-bit Binary Counter (Synchronous Clear) ADE-205-265B (Z) 3rd Edition April 2000 Description The HD74LV163A is 4-bit binary counters. All flip flops are clocked simultaneously on the low to high to transition (positive edge) of the clock input waceform. These counters may be preset using the load input. Presetting of all four flip flops is synchronous to the rising edge of clock. When load is held low counting is disabled and the data on the A, B, C and D inputs is loaded into the counter on the rising edge clock. If the load input is taken high before the positive edge of clock the count operation will be unaffected. Low-voltage and high-speed operation is suitable for the battery-powered products (e.g., notebook computers), and the low-power consumption extends the battery life. Features VCC = 2.0 V to 5.5 V operation All inputs VIH (Max.) = 5.5 V (@VCC = 0 V to 5.5 V) All outputs VO (Max.) = 5.5 V (@VCC = 0 V) Typical VOL ground bounce < 0.8 V (@VCC = 3.3 V, Ta = 25°C) Typical VOH undershoot > 2.3 V (@VCC = 3.3 V, Ta = 25°C) Output current ±6 mA (@VCC = 3.0 V to 3.6 V), ±12 mA (@VCC = 4.5 V to 5.5 V) HD74LV163A Function Table Inputs CLR L H H H H X LOAD X L H H H X ENP X X X L H X ENT X X L X H X CLK ↑ ↑ ↑ ↑ ↑ ↓ Outputs QA L A No change No change Count up No change QB L B QC L C QD L D Note: H: High level L: Low level X: Immaterial ↑: Low to high transition ↓: High to low transition A, B, C, D: Data input Carry = ENT QA QB QC ...