SCC2681：双通道异步接收器/发送器(DUART)
Philips Semiconductors SCC2681两路通用异步接收器/发送器(DUART)是一款单芯片MOS-LSI通信器件，在单个封装中提供两条独立的全双工异步接收器/发送器通道。能直接连接微处理器，可用于轮询或中断驱动系统。用CMOS工艺制造。
可对各通道的工作模式和数据格式进行单独编程。另外，每个接收器和发送器可将其工作速度选为十八个固定波特率、源自可编程计数器/定时器的16×时钟或外部1×或16×时钟之一。可从晶体或从外部时钟输入直接操作波特率生成器以及计数器/定时器。接收器和发送器工作速度的独立编程能力使DUART特别适合双速通道应用，如集群终端系统。
每个接收器均经过四重缓冲以使接收器超载的可能性最小化，或降低中断驱动系统的中断开销。另外，提供流量控制能力以在接收器件的缓冲器已满时禁用远程DUART发送器。
SCC2681上还提供多用途7位输入端口和多用途8位输出端口。这些可用作通用I/O端口或在程序控制下分配特定的功能（如时钟输入或状态/中断输出）。
SCC2681提供三种封装版本：40引脚和28引脚DIP（均为0.6"宽）以及44引脚PLCC。
特性和优势
| 产品图片 功能框图 |
关键参数
| 型号 | Package version | Application | Operating Temperature (Cel) | Number of pins | Receiver/Transmitter type | Function |
|---|---|---|---|---|---|---|
| SCC2681AC1A44 | SOT187-2 | Data Communication | 0~70 | 44 | Dual UARTs | Receivers/Transmitters |
| SCC2681AE1A44 | SOT187-2 | Data Communication | -40~85 | 44 | Dual UARTs | Receivers/Transmitters |
封装与包装
| 型号 | 封装 | Outline version | Reflow-/Wave soldering | 包装 | 产品状态 | 标示 | 可订购的器件编号, (订购码 (12NC)) |
|---|---|---|---|---|---|---|---|
| SCC2681AC1A44 |  PLCC44 (SOT187-2) | sot187-2_po | PLCC-WAVE | Tube in Drypack | 量产 | SCC2681AC1A44 | SCC2681AC1A44,512( 9352 745 21512 ) |
| Tube in Drypack | 量产 | SCC2681AC1A44 | SCC2681AC1A44,529( 9352 745 21529 ) | ||||
| Reel 13" Q1/T1 in Drypack | 量产 | SCC2681AC1A44 | SCC2681AC1A44,518( 9352 745 21518 ) | ||||
| SCC2681AE1A44 | PLCC44 (SOT187-2) | sot187-2_po | PLCC-WAVE | Tube in Drypack | 量产 | SCC2681AE1A44 | SCC2681AE1A44,512( 9352 745 18512 ) |
| Tube in Drypack | 量产 | SCC2681AE1A44 | SCC2681AE1A44,529( 9352 745 18529 ) | ||||
| Reel 13" Q1/T1 in Drypack | 量产 | SCC2681AE1A44 | SCC2681AE1A44,518( 9352 745 18518 ) |
无铅环保信息
| 型号 | 可订购的器件编号 | RoHS / RHF | 无铅转换日期 | EFR | IFR (FIT) | MTBF（小时） | 潮湿敏感度等级 | MSL LF |
|---|---|---|---|---|---|---|---|---|
| SCC2681AC1A44 | SCC2681AC1A44,512 |   | week 9, 2005 | 0.0 | 3.0 | 3.33E8 | 3 | 3 |
| SCC2681AC1A44 | SCC2681AC1A44,529 | | week 9, 2005 | 0.0 | 3.0 | 3.33E8 | 3 | 3 |
| SCC2681AC1A44 | SCC2681AC1A44,518 | | week 9, 2005 | 0.0 | 3.0 | 3.33E8 | 3 | 3 |
| SCC2681AE1A44 | SCC2681AE1A44,512 | | week 9, 2005 | 0.0 | 3.0 | 3.33E8 | 3 | 3 |
| SCC2681AE1A44 | SCC2681AE1A44,529 | | week 9, 2005 | 0.0 | 3.0 | 3.33E8 | 3 | 3 |
| SCC2681AE1A44 | SCC2681AE1A44,518 | | week 9, 2005 | 0.0 | 3.0 | 3.33E8 | 3 | 3 |
文档资料
| 档案名称 | 标题 | 类型 | 格式 | 日期 |
|---|---|---|---|---|
| SCC2681 (中文) | Dual asynchronous receiver/transmitter (DUART) | Data sheet | 2004-04-06 | |
| AN10307 | UART to Bluetooth interfacing | Application note | 2004-08-11 | |
| AN10353 | Application of UART in GPS navigation system | Application note | 2005-03-01 | |
| AN10320 | Addressing migrations of SCN devices to more advanced technologies | Application note | 2004-06-29 | |
| sot187-2_po | plastic leaded chip carrier; 44 leads | Outline drawing | 2009-10-08 | |
| PLCC-WAVE | Footprint for wave soldering | Wave soldering | 2009-10-08 |
订购信息
| 型号 | 订购码 (12NC) | 可订购的器件编号 |
|---|---|---|
| SCC2681AC1A44 | 9352 745 21512 | SCC2681AC1A44,512 |
| SCC2681AC1A44 | 9352 745 21529 | SCC2681AC1A44,529 |
| SCC2681AC1A44 | 9352 745 21518 | SCC2681AC1A44,518 |
| SCC2681AE1A44 | 9352 745 18512 | SCC2681AE1A44,512 |
| SCC2681AE1A44 | 9352 745 18529 | SCC2681AE1A44,529 |
| SCC2681AE1A44 | 9352 745 18518 | SCC2681AE1A44,518 |
- SCC2681
- UART to Bluetooth interfacing SC28L92
- Application of UART in GPS navigation system SC28L92
- Addressing migrations of SCN devices to more advanced technologies SC28L92
- plastic leaded chip carrier; 44 leads P87C52X2FA
- Footprint for wave soldering SC28L92
