SN54LS640

The SN54LS640 is designed as octal bus transceiver for asynchronous two-way communication between data buses. SN54LS640 transmits data from A bus to the B bus or from the B bus to the A bus depending upon the level at the direction control (DIR) input. The enable input can be used to disable so the buses are effectively isolated.

SN54LS640 has five features. (1) Rated at Iol of 48mA. (2) Bi-directional bus transceivers in high density 20-pin packages. (3) Hysteresis at bus inputs improves noise margins. (4) Choice of true or inverting logic. (5) Choice of 3-state or open collector outputs. That are all the main features.

Some absolute maximum ratings of SN54LS640 have been concluded into several points as follow. (1) Its supply voltage would be 7V. (2) Its input voltage would be 7V for all inputs and would be 5.5V for I/O ports. (3) Its operating free-air temperature range would be from -55°C to 125°C. (4) 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 SN54LS640. (1) Its Vik would be max -1.5V. (2) Its output voltage high would be min 2.4V and typ 3.4V at Ioh=-3mA and would be min 2V at Ioh= max. (3) Its output voltage low would be typ 0.25V and max 0.4V at Iol=12mA. (4) Its Iozh would be max 20uA. (5) Its Iozl would be max -0.4mA. (6) Its Iih would be max 20uA. (7) Its Iil would be max -0.4uA. (8) Its Ios would be min -40mA and max -225mA. (9) Its Icc would be typ 48mA and max 70mA for outputs high would be typ 62mA and max 90mA for outputs low and would be typ 64mA and max 95mA for outputs at Hi-Z. And so on. If you have any question or suggestion or want to know more information about SN54LS640 please contact us for details. Thank you!