General Description

The LVTH646 consists of registered bus transceiver circuits, D-type flip-flops, and control circuitry providing multiplexed transmission of data directly from the input bus or from the internal storage registers. Data on the A or B bus will be loaded into the respective registers on the LOW-to-HIGH transition of the appropriate clock pin (CPAB or CPBA). (See Functional Description)

The LVTH646 data inputs include bushold, eliminating the need for external pull-up resistors to hold unused inputs.

The bus transceivers are designed for low-voltage (3.3V) VCC applications, but with the capability to provide a TTL interface to a 5V environment. The LVTH646 is fabricated with an advanced BiCMOS technology to achieve high speed operation similar to 5V ABT while maintaining low power dissipation.

Features

■ Input and output interface capability to systems at 5V VCC

■ Bushold data inputs eliminate the need for external

pull-up resistors to hold unused inputs

■ Live insertion/extraction permitted

■ Power Up/Down high impedance provides glitch-free bus loading

■ Outputs source/sink −32 mA/+64 mA

■ Functionally compatible with the 74 series 646

■ Latch-up performance exceeds 500 mA