描述 Description

The SC16C554B/554DB is a 4-channel Universal Asynchronous Receiver and Transmitter (QUART) used for serial data communications. Its principal function is to convert parallel data into serial data and vice versa. The UART can handle serial data rates up to 5 Mbit/s. It comes with an Intel (16 mode) or Motorola (68 mode) interface.
The SC16C554B/554DB is pin compatible with the ST16C554 and TL16C554 and it will power-up to be functionally equivalent to the 16C454. Programming of control registers enables the added features of the SC16C554B/554DB. Some of these added features are the 16-byte receive and transmit FIFOs, four receive trigger levels. The SC16C554B/554DB also provides DMA mode data transfers through FIFO trigger levels and the TXRDY and RXRDY signals. (TXRDY and RXRDY signals are not available in the HVQFN48 package.) On-board status registers provide the user with error indications, operational status, and modem interface control. System interrupts may be tailored to meet user requirements. An internal loopback capability allows on-board diagnostics.
The SC16C554B/554DB operates at 5 V, 3.3 V and 2.5 V, and the industrial temperature range, and is available in plastic PLCC68, LQFP64, LQFP80, and HVQFN48 packages. On the HVQFN48 package only, channel C has all the modem pins. Channels A and B have only RTSn and CTSn pins and channel D does not have any modem pin.

特性 Features

4 channel UART
5 V, 3.3 V and 2.5 V operation
Industrial temperature range (-40 ℃ to +85 ℃)
The SC16C554B is pin and software compatible with the industry-standard ST16C454/554, ST68C454/554, ST16C554, TL16C554
The SC16C554DB is pin and software compatible with ST16C554D, and software compatible with ST16C454/554, ST16C554, TL16C554
Up to 5 Mbit/s data rate at 5 V and 3.3 V, and 3 Mbit/s at 2.5 V
5 V tolerant on input only pins
16-byte transmit FIFO
16-byte receive FIFO with error flags
Programmable auto-RTS and auto-CTS In auto-CTS mode, CTS controls transmitter
In auto-RTS mode, RX FIFO contents and threshold control RTS
Automatic hardware flow control (RTS/CTS)
Software selectable baud rate generator
Four selectable Receive FIFO interrupt trigger levels
Standard modem interface
Standard asynchronous error and framing bits (Start, Stop, and Parity Overrun Break)
Transmit, Receive, Line Status, and Data Set interrupts independently controlled
Fully programmable character formatting: 5-bit, 6-bit, 7-bit, or 8-bit characters
Even, odd, or no-parity formats
1, 112, or 2-stop bit
Baud generation (DC to 5 Mbit/s)
False start-bit detection
Complete status reporting capabilities
3-state output TTL drive capabilities for bidirectional data bus and control bus
Line break generation and detection
Internal diagnostic capabilities: Loopback controls for communications link fault isolation
Prioritized interrupt system controls
Modem control functions (CTS, RTS, DSR, DTR, RI, CD).