SN74ALVCHG162280GR

Registered Bus Exchanger 1Element 80Pin TSSOP T/R

The SN74ALVCHG162280 is a 16-bit to 32-bit registered bus exchanger. This device is intended for use in applications where data must be transferred from a narrow high-speed bus to a wide lower-frequency bus. It is designed specifically for low-voltage 3.3-V VCC operation.

The device provides synchronous data exchange between the two ports, A and B. Data is stored in the internal registers on the low-to-high transition of the clock CLK input. For data transfer in the B-to-A direction, the select SEL\ input selects 1B or 2B data for the A outputs.

For data transfer in the A-to-B direction, a two-stage pipeline is provided in the 1B path, with a single storage register in the 2B path. Data flow is controlled by the active-low output-enable OE\ and direction-control DIR inputs. DIR is registered to synchronize the bus direction changes with the clock.

Two mask bits are provided for both data bytes. The data D outputs are controlled by OE\\\\.

The A-port N-channel output transistors are sized at 450 µm, and the P-channel output transistors are sized at 700 µm. All A-port outputs have equivalent 50- series resistors.

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

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

The switching characteristics are based on 25-pF A port and 80-pF B and D ports loads, but are tested with the standard 50-pF load.

The SN74ALVCHG162280 is characterized for operation from 0°C to 70°C.