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Members of the Texas Instruments

WidebusE Family

State-of-the-Art EPIC-IIBE BiCMOS Design

Significantly Reduces Power Dissipation

UBT E (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-883, 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 VOLP (Output Ground Bounce)

< 0.8 V at VCC = 5 V, TA = 25°C

Flow-Through Architecture Optimizes PCB

Layout

Package Options Include Plastic 300-mil

Shrink Small-Outline (DL) and Thin Shrink

Small-Outline (DGG) Packages and 380-mil

Fine-Pitch Ceramic Flat (WD) Package

Using 25-mil Center-to-Center Spacings

description

These 18-bit universal bus transceivers consist of

storage elements that can operate either as

D-type latches or D-type flip-flops to allow data

flow in transparent or 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 data is stored in the latch/flip-flop on

the low-to-high transition of CLKAB. 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 and OE should be tied to VCC through a pullup resistor; the minimum value of the resistor is

determined by the current-sourcing/current-sinking capability of the driver.