SN54BCT646, SN74BCT646 OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS

SCBS037C - 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)
Bus Transceivers/Registers
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 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 input bus or from the internalregisters. Data on the A or B bus is clocked into the registers onthe low-to-high transition of the appropriate clock (CLKAB or CLKBA)input. Figure 1 illustrates the four fundamental bus-managementfunctions that can be performed with the ´BCT646.

Output-enable () anddirection-control (DIR) inputs are provided to control thetransceiver functions. In the transceiver mode, data present at thehigh-impedance port may be stored in either register or in both.

The select-control (SAB and SBA) inputs can multiplex stored andreal-time (transparent mode) data. The direction control (DIR)determines which bus will receive data when is low. In the isolation mode( high), A datamay be stored in one register and/or B data may be stored in theother register.

When an output function is disabled, the input function is stillenabled and may be used to store and transmit data. Only one of thetwo buses, A or B, may be driven at a time.

The SN54BCT646 is characterized for operation over the fullmilitary temperature range of -55°C to 125°C. TheSN74BCT646 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: SNJ54BCT646FK, SNJ54BCT646JT, SNJ54BCT646W, SN74BCT646DW, SN74BCT646DWR, SN74BCT646NT

View the complete PDF datasheet: scbs037c.pdf (122 K Bytes) (Requires Acrobat Reader 3.x)

View more information about generic part numbers:SN54BCT646, SN74BCT646

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