SN74LS640

The SN74LS640 is designed as octal bus transceiver for asynchronous two-way communication between data buses. Control function implementation minimizes external timing requirements. These circuits allow data transmission from the A bus to B or from the B bus to A bus depending upon the logic level of the direction control (DIR) input. Enable input (G) can disable the device so that the buses are effectively isolated.

Some guaranteed operating ranges of SN74LS640 have been concluded into several points as follow. (1)Its supply voltage range would be min 4.75V and typ 5.0V and max 5.25V. (2)Its operating ambient temperature range would be min 0°C and typ 25°C and max 70°C. (3)Its output current high level would be max -3.0mA. (4)Its output current low level would be max 24mA.

Also some DC characteristics of SN74LS640 are concluded as follow. (1)Its input high voltage would be min 2.0V with conditions of guaranteed input high voltage for all inputs. (2)Its input low voltage would be max 0.6V with conditions of guaranteed input low voltage for all inputs. (3)Its input clamp diode voltage would be typ -0.65V and max -1.5V with condition of Vcc=min, Iin=-18mA. (4)Its output high voltage would be min 2.4V and typ 3.4V. (5)Its output low voltage would be typ 0.25V and max 0.4V with condition of Iol=12mA and would be typ 0.35V and max 0.5V with condition of Iol=24mA. (6)Its input high current would be max 20uA with condition of Vcc=max and Vin=2.7V. (7)Its input low current would be max -0.4mA. (8)Its short circuit current would be min -40mA and max -225mA with condition of Vcc=max. (9)Its power supply current would be max 70mA with condition of Vcc=max.

And some AC characteristics of SN74LS640 are concluded into several points as follow. (1)Its propagation delay A or B to output would be typ 6.0ns and max 10ns. (2)Its propagation delay B to A would be typ 6ns and max 10ns. (3)Its output enable time DIR to A would be typ 31ns and max 40ns. And so on. If you have any question or suggestion or want to know more information please contact us for details. Thank you!