SC16C2550 datasheet(9/46 Pages) PHILIPS

Part #	SC16C2550

Description	Dual UART with 16 bytes of transmit and receive FIFOs and infrared (IrDA) encoder/decoder

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Manufacturer	PHILIPS [NXP Semiconductors]

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Philips Semiconductors

SC16C2550

Dual UART with 16 bytes of transmit and receive FIFOs and IrDA

encoder/decoder

Product data

Rev. 03 — 19 June 2003

9 of 46

9397 750 11621

6.

Functional description

The SC16C2550 provides serial asynchronous receive data synchronization,

parallel-to-serial and serial-to-parallel data conversions for both the transmitter and

receiver sections. These functions are necessary for converting the serial data

stream into parallel data that is required with digital data systems. Synchronization for

the serial data stream is accomplished by adding start and stop bits to the transmit

data to form a data character (character orientated protocol). Data integrity is insured

by attaching a parity bit to the data character. The parity bit is checked by the receiver

for any transmission bit errors. The electronic circuitry to provide all these functions is

fairly complex, especially when manufactured on a single integrated silicon chip. The

SC16C2550 represents such an integration with greatly enhanced features. The

SC16C2550 is fabricated with an advanced CMOS process.

The SC16C2550 is an upward solution that provides a dual UART capability with

16 bytes of transmit and receive FIFO memory, instead of none in the 16C2450. The

SC16C2550 is designed to work with high speed modems and shared network

environments that require fast data processing time. Increased performance is

realized in the SC16C2550 by the transmit and receive FIFOs. This allows the

external processor to handle more networking tasks within a given time. For example,

the ST16C2450 without a receive FIFO, will require unloading of the RHR in

93 microseconds (this example uses a character length of 11 bits, including start/stop

bits at 115.2 kbits/s). This means the external CPU will have to service the receive

FIFO less than every 100 microseconds. However, with the 16 byte FIFO in the

SC16C2550, the data buffer will not require unloading/loading for 1.53 ms. This

increases the service interval, giving the external CPU additional time for other

applications and reducing the overall UART interrupt servicing time. In addition, the

four selectable receive FIFO trigger interrupt levels is uniquely provided for maximum

data throughput performance especially when operating in a multi-channel

environment. The FIFO memory greatly reduces the bandwidth requirement of the

external controlling CPU, increases performance, and reduces power consumption.

The SC16C2550 is capable of operation up to 5 Mbits/s with a 80 MHz clock. With a

crystal or external clock input of 7.3728 MHz, the user can select data rates up to

460.8 kbits/s.

The rich feature set of the SC16C2550 is available through internal registers.

Selectable receive FIFO trigger levels, selectable TX and RX baud rates, and modem

interface controls are all standard features. Following a power-on reset or an external

reset, the SC16C2550 is software compatible with the previous generation,

ST16C2450.

6.1 UART A-B functions

The UART provides the user with the capability to bi-directionally transfer information

between an external CPU, the SC16C2550 package, and an external serial device. A

logic 0 on chip select pins CSA and/or CSB allows the user to conﬁgure, send data,

and/or receive data via UART channels A-B. Individual channel select functions are

shown in Table 3.

Similar Part No. - SC16C2550

Manufacturer	Part #	Datasheet	Description
NXP Semiconductors	SC16C2550	603Kb / 46P	Dual UART with 16 bytes of transmit and receive FIFOs and infrared (IrDA) encoder/decoder Rev. 03-19 June 2003
	SC16C2550B	200Kb / 42P	5 V, 3.3 V and 2.5 V dual UART, 5 Mbit/s (max.), with 16-byte FIFOs Rev. 02-14 December 2004
	SC16C2550B	211Kb / 43P	5 V, 3.3 V and 2.5 V dual UART, 5 Mbit/s (max.), with 16-byte FIFOs Rev. 04-15 February 2007
	SC16C2550B	221Kb / 43P	5 V, 3.3 V and 2.5 V dual UART, 5 Mbit/s (max.), with 16-byte FIFOs Rev. 05-12 January 2009
	SC16C2550BIA44	200Kb / 42P	5 V, 3.3 V and 2.5 V dual UART, 5 Mbit/s (max.), with 16-byte FIFOs Rev. 02-14 December 2004

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Similar Description - SC16C2550

Manufacturer	Part #	Datasheet	Description
NXP Semiconductors	SC16C2550	603Kb / 46P	Dual UART with 16 bytes of transmit and receive FIFOs and infrared (IrDA) encoder/decoder Rev. 03-19 June 2003
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Exar Corporation	ST16C2550	443Kb / 34P	DUAL UART WITH 16-BYTE TRANSMIT AND RECEIVE FIFOS
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