SN54ABT646, SN74ABT646 OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS

SCBS068E - 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), Shrink Small-Outline (DB), and Thin Shrink Small-Outline (PW) 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 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 ´ABT646.

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.

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.

The SN74ABT646 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 SN54ABT646 is characterized for operation over the fullmilitary temperature range of -55°C to 125°C. TheSN74ABT646 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: SN74ABT646DBLE, SN74ABT646DGVR, SN74ABT646DW, SN74ABT646DWR, SN74ABT646NT, SN74ABT646PWLE

View the complete PDF datasheet: scbs068e.pdf (147 K Bytes) (Requires Acrobat Reader 3.x)

View more information about generic part numbers:SN74ABT646

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