HD74LV161A Datasheet | Hitachi Semiconductor

Description The HD74LV161A is 4-bit binary counters. All flip flops are clocked simultaneously on the low to high to transition (positive edge) of the clock input waveform. 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 tha 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 puters), 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 m A (@VCC = 3.0 V to 3.6 V), ±12 m A (@VCC = 4.5 V to 5.5 V) Function Table Inputs CLR L H H H H H LOAD X L H H H X ENP X X X L H X ENT X X L X H X CLK X ↑ ↑ ↑ ↑ ↓ 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 - QD Pin Arrangement CLR 1 CK 2 A 3 B 4 C 5 D 6 ENP 7 GND 8 16 VCC CARRY 15 OUTPUT 14 QA 13 QB 12 QC 11 QD 10 ENT 9 LOAD (Top view) Absolute Maximum Ratings Item Supply voltage range Input voltage range- 1 1, 2 Symbol VCC VI VO Ratings - 0.5 to 7.0 - 0.5 to 7.0 - 0.5 to VCC + 0.5 - 0.5 to 7.0 Unit V V V Conditions H or L Output: H or L VCC: OFF Output voltage range- Input clamp current Output clamp current Continuous output current Continuous current through VCC or GND Maximum power dissipation at Ta = 25°C (in still air)- 3 I IK I OK IO I CC or IGND PT - 20 ±50 ±25 ±50 785 500 m...