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STMicro transceiver has power-on protection

Posted: 11 Nov 2003 ?? ?Print Version ?Bookmark and Share

Keywords:stmicroelectronics? transceiver ic? 74lvc161284ttr? transceiver? 74lvcz161284attr?

STMicroelectronics has developed a pair of low-voltage transceiver ICs that conform to the IEEE1284 parallel port interface standard and are designed for use in printers, scanners, and copiers.

The 74LVC161284TTR is a low-voltage, high-speed IEEE1284 transceiver, while the 74LVCZ161284ATTR is a similar part but offers an error-free power-up function as well. Each IC can replace the function of two 74ACT1284 devices.

Both parts support IEEE1284-I and -II bi-directional parallel communications between personal computers and peripherals. A translation capability allows outputs on the cable side to interface with a 5V signal. A pull-up resistor is integrated on each open-drain output to eliminate the need for a discrete resistor to perform the same function.

The A port pins of the interface have standard 4mA totem-pole outputs, while the B port pins offer the ability to source or sink up to 14mA. The products have TTL-compatible inputs, despite working with operating voltages of between 3V and 3.6V. Power dissipation is 20mA with a 3.6V supply, and delay is 9ns.

The chips are laid out with a 'flow-through' pin configuration so they can be designed into PCBs. The transceiver ICs are available in a TSSOP at a commercial temperature grade.

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