SN54LS440

The SN54LS440 is designed as one kind of bus transceivers for asynchronous three-way communication between four-line data buses. SN54LS440 gives the designer a choice of selecting inverting, noninverting or a combination of inverting and noninverting data paths with either 3-state or open-collector outputs.

SN54LS440 has four features. (1)3-way asynchronous communication. (2)On-chip bus selection decoding. (3)Input hysteresis improves noise margin. (4)Choice of open-collector ot 3-state outputs. Those are all the main features.

Some absolute maximum ratings of SN54LS440 have been concluded into several points as follow. (1)Its supply voltage Vcc would be 7V. (2)Its input voltage would be 7V. (3)Its off-state output voltage would be 5.5V. (4)Its operating free-air temperature range would be from -55°C to 125°C. (5)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 of SN54LS440 are concluded as follow. (1)Its high level input voltage would be min 2V. (2)Its low level input voltage would be max 0.5V. (3)Its input clamp voltage would be max -1.5V. (4)Its hysteresis would be min 0.1V and typ 0.4V. (5)Its high level output current would be max 100uA. (6)Its low level output voltage would be typ 0.25V and max 0.4V at Iol=12mA. (7)Its input current at maximum input voltage would be max 0.1mA. (8)Its high level input current would be max 20uA. (9)Its low level input current would be max -0.4mA. (10)Its supply current would be typ 62mA and max 90mA for output low and would be typ 64mA and max 95mA for output disabled. And so on. At present we have not got so much information about this IC and we would try hard to get more information about SN54LS440. If you have any question or suggestion or want to know more information please contact us for details. Thank you!