SN54HCT257FK

The SN54HCT257FK is designed as quadruple 2-line to 1-line data seletors / multiplexers with 3-state outputs to multiplex signals from 4-bit data sources to 4-output data lines in bus-organized systems. The 3-state outputs of SN54HCT257FK do not load the data lines when the output-enable (OE) input is at the high logic level.

SN54HCT257FK has six features. (1) Inputs are TTL-voltage compatible. (2) Provide bus interface from multiple sources in high-performance systems. (3) High-current 3-state outputs interface directly with system bus. (4) Buffered inputs and outputs. (5) Package options include ceramic chip carriers (FK) and standard plastic (N) and ceramic (J) 300-mil DIPs. That are all the main features.

Some absolute maximum ratings of SN54HCT257FK have been concluded into several points as follow. (1) Its supply voltage range would be from -0.5V to 7V. (2) Its input clamp current would be ±20mA. (3) Its output clamp current would be ±20mA. (4) Its continuous output current would be ±35mA. (5) Its continuous current through VCC or GND would be ±70mA. (6) Its package thermal impedance would be 78°C/W for N package. (7) Its storage temperature range would be from -65°C to 150°C. It should be noted that stresses above those listed in absolute maximum ratings may cause permanent damage to device.

Also some electrical characteristics about SN54HCT257FK. (1) Its output voltage high would be min 4.4V and typ 4.499V at Vcc=4.5V and Ioh=-20uA and it would be min 3.98V and typ 4.3V at Vcc=4.5V and Ioh=-6mA. (2) Its output voltage low would be typ 0.001V and max 0.1V at Vcc=4.5V and Iol=20uA and typ 0.17V and max 0.26V at Vcc=4.5V and Iol=6mA. (3) Its Ii would be typ 0.1nA and max 100nA. (4) Its Ioz would be typ 0.01uA and max 0.5uA. And so on. If you have any question or suggestion or want to know more information please contact us for details. Thank you!