OX16C954

Features:

·  Four independent full-duplex asynchronous 16C950 high performance UART channels
·  128-byte deep FIFO per transmitter and receiver
·  UARTs fully software compatible with industry standard 16C55x type UARTs
·  Pin compatible with TL16C554 and ST16C654
·  Baud rates up to 15 Mbps in normal mode and 60Mbps in external 1x clock (isochronous) mode
·  Readable FIFO levels
·  Flexible clock prescaler from 1 to 31.875
·  Automated in-band flow control using programmable Xon/Xoff characters, in both directions
·  Automated out-of-band flow control using CTS#/RTS# and/or DSR#/DTR#
·  Arbitrary trigger levels for receiver and transmitter FIFO interrupts and automatic in-band and out-ofband flow control
·  Readable in-band and out-of-band flow control status
·  Programmable special character detection
·  Infra-red (IrDA) receiver and transmitter option
·  5, 6, 7, 8 and 9-bits data framing
·  Detection of bad data in the receiver FIFO
·  Independent channel reset by software
·  Transmitter and receiver can be disabled
·  Transmitter idle interrupt
·  RS-485 buffer enable signals
·  Four byte device ID
·  Sleep mode (low operating current)
·  System clock up to 60 MHz at 5V, 50 MHz at 3.3V
·  5.0 volt or 3.3v operation*
·  68pin PLCC and 80pin TQFP package options.


Pinout




Specifications

Symbol	Parameter	Min	Max	Units
VDD	DC supply voltage	4.75	5.25	V
TO	Operating Temperature range	0	70

Description

The OX16C954 is a single chip solution for 4 channel serial add-in cards. Each UART channel in the OX16C954 offers data rates up to 15Mbps and 128-byte deep transmitter and receiver FIFOs. Deep FIFOs reduce CPU overhead and allow utilisation of higher data rates.

Each UART channel of OX16C954  is software compatible with the widely used industry-standard 16C550 devices and compatibles, as well as the OX16C95x family of high performance UARTs. It is pin-compatible with the TL16C554, ST16C654 devices.

In addition to increased performance and FIFO size, the UARTs of OX16C954 also provide the full set of OX16C95x enhanced features. These include improved flow controls such as automated software flow control using Xon/Xoff and automated hardware flow control using CTS#/RTS# and DSR#/DTR# to prevent FIFO over-run.

Flow control and interrupt thresholds of OX16C954 are fully programmable and readable, enabling programmers to fine-tune the performance of their system. FIFO levels are readable to facilitate fast driver applications.

The addition of software reset of OX16C954 enables recovery from unforeseen error conditions allowing drivers to restart gracefully. The OX16C954 supports 9-bit data frames used in multi-drop industrial protocols. It also offers multiple external clock options for isochronous applications, e.g. ISDN, xDSL.

The OX16C954 is ideally suited to PC applications, such as high-speed multi-port add-in cards that enable PC users to take advantage of the maximum performance of analogue modems or ISDN terminal adapters. It is also suitable for any equipment requiring high speed RS232/RS422/RS485 interfaces.

Fabricated in 0.6mm process, OX16C954 also has a low operating current and sleep mode for battery powered applications.