54ABT646  Product Folder

The 'ABT646 consists of bus transceiver circuits with TRI-STATE, D-type flip-flops, and control circuitry arranged for multiplexed transmission of data directly from the input bus or from the internal registers. Data on the A or B bus will be clocked into the registers as the appropriate clock pin goes to a high logic level. Control OE# and direction pins are provided to control the transceiver function. In the transceiver mode, data present at the high impedance port may be stored in either the A or the B register or in both. The select controls can multiplex stored and real-time (transparent mode) data. The direction control determines which bus will receive data when the enable control OE# is Active LOW. In the isolation mode (control OE# HIGH), A data may be stored in the B register and/or B data may be stored in the A register.

• Independent registers for A and B buses
• Multiplexed real-time and stored data
• A and B output sink capability of 48 mA, source capability of 24 mA
• Guaranteed multiple output switching specifications
• Output switching specified for both 50 pF and 250 pF loads
• Guaranteed simultaneous switching noise level and dynamic threshold performance
• Guaranteed latchup protection
• High impedance glitch free bus loading during entire power up and power down cycle
• Nondestructive hot insertion capability
• Standard Microcircuit Drawing (SMD) 5962-9457701