HD74HC273

HD74HC273 Octal D-type Flip-Flops (with Clear) Description This device contains 8 master-slave flip-flops with a common clock and common clear. Data on the D input having the specified setup and hold times is transferred to the Q output on the low to high transition of the clock input. The clear input when low, sets all outputs to a low state. Features High Speed Operation: tpd (Clock to Q) = 18 ns typ (CL = 50 pF) High Output Current: Fanout of 10 LSTTL Loads Wide Operating Voltage: VCC = 2 to 6 V Low Input Current: 1 µA max Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C) Function Table Inputs Clear L H H H H L Clock X D X H L X X Outputs Q L H L No change No change HD74HC273 Pin Arrangement Clear 1Q 1D 2D 2Q 3Q 3D 4D 4Q 1 2 3 4 5 6 7 8 9 20 VCC Q Q 19 8Q 18 8D 17 7D 16 7Q 15 6Q 14 6D 13 5D 12 5Q 11 Clock Clear D CK Clear CK D D Q CK CK D Q Clear Clear Q Q Clear D CK Clear CK D D Q CK CK D Q Clear Clear GND 10 (Top view) 2 HD74HC273 Logic Diagram Clock 1D Clear CK Q CK D CL Q 1Q 2D D CL 2Q CK 3D D CL Q 3Q CK 4D D CL CK Q 4Q 5D D CL Q 5Q CK 6D D CL Q 6Q CK 7D D CL Q 7Q CK 8D D CL Q 8Q 3 HD74HC273 DC Characteristics Ta = 25°C Item Input voltage Symbol VIH Ta = –40 to +85°C Max — — — 0.5 1.35 1.8 — — — — — 0.1 0.1 0.1 0.33 0.33 ±1.0 40 µA µA I OL = 4 mA I OL = 5.2 mA Vin = VCC or GND Vin = VCC or GND, Iout = 0 µA V I OH = –4 mA I OH = –5.2 mA Vin = VIH or VIL I OL = 20 µA V Vin = VIH or ...