UART "ON THE
RUN" FROM EXAR!
Introducing the fastest available RS-485 UART with integrated transceiver!
In early April 2007, EXAR CORPORATION,
a manufacturer of diverse silicon solutions for the worldwide communications
infrastructure, launched the XR19L40x series - the first single- and dual-channel 8-bit
UARTs on the market to integrate an RS-485 transceiver and thus support data rates of up
to 8Mbps.
The XR19L40x series offers different packaging and modem interface options. The devices
operate using a +3.3V to 5.5V supply voltage, at data rates of up to 8Mbps, while meeting
all EIA/TIA-485 specifications. The configuration register set is 16550 UART-compatible
with respect to control, status and data transfer. In addition, the devices have 64byte
transmit and receive buffers, automatic RTS/CTS hardware flow control, automatic Xon/Xoff
and special character (software) flow control. The chips furthermore include an ACP pin
that permits shutting down the charge pump for the RS-485 transceiver. Activating this pin
also isolates the cutoff of the data bus in the UART portion, to further reduce power
consumption.
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Both the XR19L400 and XR19L402 can
operate in four different modes: active, partial sleep, full sleep and power save. Each
mode can be invoked via hardware or software. Upon power-up, the device is in the active
mode, where the UART and RS-485 transceiver function normally. In the partial sleep mode,
the internal crystal oscillator of the UART and the charge pump for the RS-485 transceiver
are turned off.
In full sleep mode, all of the device's oscillators and charge pumps are turned off. The
power-save mode isolates the core logic from the control signals (chip select, read/write
strobes, address and data bus lines) to minimize power consumption. The receiver, however
remains active in each of these four modes.
I would be pleased to tell you more in person! Simply call:
Ondrej Gavura, EXT 953
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