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SN74ABT16833DLR

双8位至9位奇偶总线收发器 DUAL 8-BIT TO 9-BIT PARITY BUS TRANSCEIVERS

The "ABT16833 consist of two noninverting 8-bit to 9-bit parity bus transceivers and are designed for communication between data buses. For each transceiver, when data is transmitted from the A bus to the B bus, an odd-parity bit is generated and output on the parity I/O pin 1PARITY or 2PARITY. When data is transmitted from the B bus to the A bus, 1PARITY or 2PARITY is configured as an input and combined with the B-input data to generate an active-low error flag if odd parity is not detected.

The error 1 or 2 output is configured as an open-collector output. The B-to-A parity-error flag is clocked into 1 or 2 on the low-to-high transition of the clock 1CLK or 2CLK input. 1 or 2 is cleared set high by taking the clear 1 or 2 input low.

The output-enable and inputs can be used to disable the device so that the buses are effectively isolated. When both and are low, data is transferred from the A bus to the B bus and inverted parity is generated. Inverted parity is a forced error condition that gives the designer more system diagnostic capability.

To ensure the high-impedance state during power up or power down, 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.

The SN54ABT16833 is characterized for operation over the full military temperature range of -55°C to 125°C. The SN74ABT16833 is characterized for operation from -40°C to 85°C.

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