SN54ABT652, SN74ABT652 OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS

SCBS070D - JULY 1991 - REVISED JULY 1994

features

State-of-the-Art EPIC-IIB^TM BiCMOS Design Significantly Reduces Power Dissipation
ESD Protection Exceeds 2000 V Per MIL-STD-883C, Method 3015; Exceeds 200 V Using Machine Model (C = 200 pF, R = 0)
Latch-Up Performance Exceeds 500 mA Per JEDEC Standard JESD-17
Typical V_OLP (Output Ground Bounce) < 1 V at V_CC = 5 V, T_A = 25°C
High-Drive Outputs (-32-mA I_OH, 64-mA I_OL)
Package Options Include Plastic Small-Outline ((DW)) and Shrink Small-Outline (DB) Packages, Ceramic Chip Carriers (FK), and Plastic (NT) and Ceramic (JT) DIPs

EPIC-IIB is a trademark of Texas Instruments

description

These devices consist of bus transceiver circuits, D-typeflip-flops, and control circuitry arranged for multiplexedtransmission of data directly from the data bus or from the internalstorage registers.

Output-enable (OEAB and )inputs are provided to control the transceiver functions.Select-control (SAB and SBA) inputs are provided to select whetherreal-time or stored data is transferred. The circuitry used forselect control eliminates the typical decoding glitch that occurs ina multiplexer during the transition between stored and real-timedata. A low input selects real-time data, and a high input selectsstored data. Figure 1 illustrates the four fundamental bus-managementfunctions that can be performed with the ´ABT652.

Data on the A or B data bus, or both, can be stored in theinternal D-type flip-flops by low-to-high transitions at theappropriate clock (CLKAB or CLKBA) inputs regardless of the select-or enable-control pins. When SAB and SBA are in the real-timetransfer mode, it is possible to store data without using theinternal D-type flip-flops by simultaneously enabling OEAB and . In this configuration, eachoutput reinforces its input. When all other data sources to the twosets of bus lines are at high impedance, each set of bus linesremains at its last state.

To ensure the high-impedance state during power up or power down, should be tiedto V_CC through a pullup resistor; the minimum value of theresistor is determined by the current-sinking capability of thedriver (B to A). OEAB should be tied to GND through a pulldownresistor; the minimum value of the resistor is determined by thecurrent-sourcing capability of the driver (A to B).

The SN74ABT652 is available in TI's shrink small-outline package(DB), which provides the same I/O pin count and functionality ofstandard small-outline packages in less than half theprinted-circuit-board area.

The SN54ABT652 is characterized for operation over the fullmilitary temperature range of -55°C to 125°C. TheSN74ABT652 is characterized for operation from -40°C to85°C.

Title: OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS
Product Family: REGISTERED TRANSCEIVERS
Device Functionality: OCTAL BUS TRANSCEIVER AND REGISTER
Orderable Devices: SN74ABT652DBLE, SN74ABT652DW, SN74ABT652DWR, SN74ABT652NT

View the complete PDF datasheet: scbs070d.pdf (166 K Bytes) (Requires Acrobat Reader 3.x)

View more information about generic part numbers:SN74ABT652

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