SN54ABT16500A, SN74ABT16500A 18-BIT UNIVERSAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS

SCBS057C-D3658, DECEMBER 1990-REVISED OCTOBER 1992

features

Members of the Texas Instruments Widebus^TM Family
State-of-the-Art EPIC-IIB^TM BiCMOS Design Significantly Reduces Power Dissipation
UBT^TM (Universal Bus Transceiver) Combines D-Type Latches and D-Type Flip-Flops for Operation in Transparent, Latched, or Clocked Mode
ESD Protection Exceeds 2000 V Per MIL-STD-883C, Method 3015; Exceeds 200V 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) < 0.8 V at V_CC = 5 V, T_A = 25°C
Flow-Through Architecture Optimizes PCB Layout
Packaged in Plastic 300-mil Shrink Small-Outline Packages (DL) and 380-mil Fine-Pitch Ceramic Flat Packages (WD) Using 25-mil Center-to-Center Spacings

Widebus+, EPIC-IIB, and UBT are trademarks of Texas Instruments Incorporated.

description

These 18-bit universal bus transceivers combine D-type latches and D-type flip-flops to allow data flow in transparent, latched, and clocked modes.

Data flow in each direction is controlled by output-enable (OEAB and OEBA\), latch-enable (LEAB and LEBA), and clock (CLKAB\ and CLKBA\) inputs. For A-to-B data flow, the device operates in the transparent mode when LEAB is high. When LEAB is low, the A data is latched if

CLKAB\ is held at a high or low logic level. If LEAB is low, the A bus data is stored in the latch/flip-flop on the high-to-low transition of CLKAB\. Output-enable OEAB is active-high. When OEAB is high, the outputs are active. When OEAB is low, the outputs are in the high-impedance state.

Data flow for B to A is similar to that of A to B but uses OEBA\, LEBA, and CLKBA\. The output enables are complementary (OEAB is active high and OEBA\ is active low).

To ensure the high-impedance state during power up or power down, OE should be tied to GND through a pulldown resistor; the minimum value of the resistor is determined by the current-sourcing capability of the driver.

The SN74ABT16500A is packaged in TI's shrink small-outline package (DL), which provides twice the I/O pin count and functionality of standard small-outline packages in the same printed-circuit-board area.

The SN54ABT16500A is characterized over the full military temperature range of -55°C to 125°C. The SN74ABT16500A is characterized for operation from -40°C to 85°C.

Title: 18-BIT UNIVERSAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS
Product Family: UNIVERSAL BUS TRANSCEIVERS (UBTS)
Device Functionality: 18-BIT BUS TRANSCEIVER
Orderable Devices: SN74ABT16500ADGGR, SN74ABT16500ADL, SN74ABT16500ADLR

View the complete PDF datasheet: scbs057c.pdf (112 K Bytes) (Requires Acrobat Reader 3.x)

View more information about generic part numbers:SN74ABT16500A

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