SN74LVTH16652EP

3.3V ABT 16BIT BUS TRANSCEIVER AND REGISTER

WITH 3STATE OUTPUTS

SCBS787 − NOVEMBER 2003

2

POST OFFICE BOX 655303

description/ordering information (continued)

Output-enable (OEAB and OEBA) inputs are provided to control the transceiver functions. Select-control (SAB

and SBA) inputs are provided to select whether real-time or stored data is transferred. A low input level selects

real-time data, and a high input level selects stored data. The circuitry used for select control eliminates the

typical decoding glitch that occurs in a multiplexer during the transition between stored and real-time data.

Figure 1 illustrates the four fundamental bus-management functions that can be performed with the

SN74LVTH16652.

Data on the A or B bus, or both, can be stored in the internal D flip-flops by low-to-high transitions at the

appropriate clock (CLKAB or CLKBA) inputs, regardless of the levels on the select-control or output-enable

inputs. When SAB and SBA are in the real-time transfer mode, it also is possible to store data without using the

internal D-type flip-flops by simultaneously enabling OEAB and OEBA. In this configuration, each output

reinforces its input. When all other data sources to the two sets of bus lines are at high impedance, each set

of bus lines remains at its last level configuration.

and OE should be tied to GND through a pulldown resistor; the minimum value of the resistor is determined by

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

Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level.

disables the outputs, preventing damaging current backflow through the device when it is powered down. The

power-up 3-state circuitry places the outputs in the high-impedance state during power up and power down,

which prevents driver conflict.

ORDERING INFORMATION

TA

PACKAGE†

ORDERABLE

PART NUMBER

TOP-SIDE

MARKING

−40

°C to 85°C

TSSOP − DGG

Tape and reel

CLVTH16652IDGGREP

LH16652EP

† Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available

at www.ti.com/sc/package.