(Hong Kong)
Product Summary
The 74HC191A is a high speed CMOS 4-Bit Binary Up/Down Counter. It is fabricated with silicon gate C2MOS technology. The 74HC191A has an asynchronous load input (LOAD) which is active low. The direction of counting is determined by the level of DOWN/UP. When D/U is low, the counter counts up; when D/U is high, it counts down. Counting occurs on the positive going transition of the clock input.
Parametrics
74HC191A absolute maximum ratings: (1)Supply voltage range VCC: -0.5 to 7V; (2)DC input voltage VIN: -0.5V to VCC + 0.5V; (3)DC output voltage VOUT: -0.5V to VCC + 0.5V; (4)Input diode current IIK: ±20mA; (5)Output diode current IOK: ±20mA; (6)DC output current IOUT: ±25mA; (7)DC VCC/ground current ICC: ±50mA; (8)Power dissipation PD: 500mW (DIP) (Note 2)/180 (SOP); (9)Storage temperature Tstg: - 65℃ to 150℃.
Features
74HC191A features: (1)High speed: fmax = 48 MHz (typ.) at VCC = 5V; (2)Low power dissipation: ICC = 4μA (max) at Ta = 25℃; (3)High noise immunity: VNIH = VNIL = 28% VCC (min); (4)Output drive capability: 10 LSTTL loads; (5)Symmetrical output impedance: |IOH| = IOL = 4mA (min); (6)Balanced propagation delays: tpLH≈ tpHL; (7)Wide operating voltage range: VCC (opr) = 2V to 6V; (8)Pin and function compatible with 74LS191.
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