SN54BCT652, SN74BCT652 OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS

SCBS038A - AUGUST 1989 - REVISED NOVEMBER 1993

features

State-of-the-Art BiCMOS Design Significantly Reduces I_CCZ
ESD Protection Exceeds 2000 V Per MIL-STD-883C, Method 3015; Exceeds 200 V Using Machine Model (C = 200 pF, R = 0)
Independent Registers and Enables for A and B Buses
Multiplexed Real-Time and Stored Data
Power-Up High-Impedance Mode
Package Options Include Plastic Small-Outline (DW) Packages, Ceramic Chip Carriers (FK) and Flatpacks (W), and Standard Plastic and Ceramic 300-mil DIPs (JT, NT)

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 ´BCT652.

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 each outputreinforces its input. Therefore, when all other data sources to thetwo sets of bus lines are at high impedance, each set of bus linesremain at its last state.

The SN54BCT652 is characterized for operation over the fullmilitary temperature range of -55°C to 125°C. TheSN74BCT652 is characterized for operation from 0°C to 70°C.

Title: OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS
Product Family: REGISTERED TRANSCEIVERS
Device Functionality: BUS TRANSCEIVERS
Orderable Devices: SNJ54BCT652FK, SNJ54BCT652JT, SNJ54BCT652W, SN74BCT652DW, SN74BCT652DWR, SN74BCT652NT

View the complete PDF datasheet: scbs038a.pdf (105 K Bytes) (Requires Acrobat Reader 3.x)

View more information about generic part numbers:SN54BCT652, SN74BCT652

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