74F2645 Datasheet | Fairchild Semiconductor

Description This device is an octal bus transceiver designed for asynchronous two-way data flow between the A and B busses and is functionally equivalent to the 74F645. The 25Ω series resistors in the outputs reduce ringing and eliminate the need for external resistors. Both busses are capable of sinking 12 m A, sourcing 15 m A, have 3-STATE outputs, and a mon output enable pin. The direction of data flow is determined by the transmit/receive (T/R) input. The 74F2645 is a low power version of the 74F245 with 25Ω series resistors in the outputs. Features s 25Ω series resistors in the outputs eliminates the need for external resistors s Designed for asynchronous two-way data flow between busses s Outputs sink 12 m A and source 15 m A s Transmit/receive (T/R) input controls the direction of data flow s 74F2645 is a low power version of the 74F245 with 25Ω series resistors in the outputs Ordering Code: Order Number 74F2645SC Package Number M20B Package Description 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Logic Symbol Connection Diagram FAST® is a registered trademark of Fairchild Semiconductor Corporation. © 1999 Fairchild Semiconductor Corporation DS010629 .fairchildsemi. Unit Loading/Fan Out Pin Names OE T/R A0- A7 B0- B7 Description Output Enable Input (Active LOW) Transmit/Receive Input Side A Inputs or 3-STATE Outputs Side B Inputs or 3-STATE Outputs U.L. HIGH/LOW 1.0/1.0 1.0/1.0 3.5/0.667 750/20 3.5/0.667 750/20 Input IIH/IIL Output IOH/IOL 20 µA/- 0.6 m A 20 µA/- 0.6 m A 70 µA/- 0.4 m A - 15 m A/12 m A 70 µA/- 0.4 m A - 15 m A/12 m A Functional Description The output enable (OE) is active LOW. If the device is disabled (OE HIGH), the outputs are in the high impedance state. The transmit/receive input (T/R) controls whether data is transmitted from the A bus to the B bus or from the B bus to the A bus. When T/R is LOW, B data...