(China (Mainland))
Product Summary
The 74HC257A is a quad 2-input data selector. The 74HC257A inputs are compatible with standard CMOS outputs; with pullup resistors, they are compatible with LS/ALSTTL outputs. The 74HC257A selects a (4-bit) nibble from either the A or B inputs as determined by the Select input. The nibble is presented at the outputs in noninverted from when the Output Enable pin is at a low level. A high level on the Output Enable pin switches the outputs into the high-impedance state.
Parametrics
74HC257A absolute maximum ratings: (1)VCC DC Supply Voltage (Referenced to GND): -0.5 to +7.0V ; (2)VIN DC Input Voltage (Referenced to GND):-1.5 to VCC +1.5V; (3)VOUT DC Output Voltage (Referenced to GND): -0.5 to VCC +0.5V; (4)IIN DC Input Current, per Pin: ±20mA ; (5)IOUT DC Output Current, per Pin: ±35mA ; (6)ICC DC Supply Current, VCC and GND Pins: ±75 mA ; (7)PD Power Dissipation in Still Air, Plastic DIP+ SOIC Package+ 750: 500 mW ; (8)Tstg Storage Temperature: -65 to +150 ℃ ; (9)TL Lead Temperature, 1 mm from Case for 10 Seconds (Plastic DIP or SOIC Package): 260 ℃ .
Features
74HC257A features: (1)3-state non-inverting outputs for bus oriented applications; (2)8-bit positive, edge-triggered register; (3)Common 3-state output enable input; (4)Independent register and 3-state buffer operation; (5)Output capability: bus driver; (6)ICC category: MSI.
Diagrams
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