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This literature is subject to all applicable copyright laws and is not for resale in any manner.74VHC161284 IEEE 1284 Transceiver February 1998 Revised June 2005 74VHC161284 IEEE 1284 Transceiver General Description Features The VHC161284 contains eight bidirectional data buffers Supports IEEE 1284 Level 1 and Level 2 signaling and eleven control/status buffers to implement a full standards for bidirectional parallel communications IEEE 1284 compliant interface. The device supports the between personal computers and printing peripherals IEEE1284 standard and is intended to be used in Replaces the function of two (2) 74ACT1284 devices Extended Capabilities Port mode (ECP). The pinout allows All inputs have hysteresis to provide noise margin for easy connection from the Peripheral (A-side) to the B and Y output resistance optimized to drive external Host (cable side). cable Outputs on the cable side can be configured to be either B and Y outputs in high impedance mode during power open drain or high drive (r 14 mA). The pull-up and pull- down down series termination resistance of these outputs on the Inputs and outputs on cable side have internal pull-up cable side is optimized to drive an external cable. In addi- tion, all inputs (except HLH) and outputs on the cable side resistors contain internal pull-up resistors connected to the V sup- CC Flow-through pin configuration allows easy interface ply to provide proper termination and pull-ups for open between the Peripheral and Host drain mode. Outputs on the Peripheral side are standard LOW-drive CMOS outputs. The DIR input controls data flow on the A 1 A /B B transceiver pins. 8 1 8 Ordering Code: Ordering Number Package Number Package Description 74VHC161284MEA MS48A 48-Lead Small Shrink Outline Package (SSOP), JEDEC MO-118, 0.300 Wide 74VHC161284MTD MTD48 48-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide Surface mount packages are also available on Tape and Reel. Specify by appending the suffix letter X to the ordering code. Logic Symbol Connection Diagram 2005 Fairchild Semiconductor Corporation DS500098 www.fairchildsemi.com