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| 型号： | SC28L198A1BE,551 |
| 厂商： | NXP Semiconductors |
| 文件页数： | 55/57页 |
| 文件大小： | 0K |
| 描述： | IC UART OCTAL SOT407-1 |
| 标准包装： | 90 |
| 特点： | 故障启动位检测 |
| 通道数： | 8 |
| FIFO's： | 16 字节 |
| 电源电压： | 3.3V，5V |
| 带自动流量控制功能： | 是 |
| 带故障启动位检测功能： | 是 |
| 带调制解调器控制功能： | 是 |
| 带CMOS： | 是 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 100-LQFP |
| 供应商设备封装： | 100-LQFP（14x14） |
| 包装： | 托盘 |
| 其它名称： | 935262731551 SC28L198A1BE-S SC28L198A1BE-S-ND |
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Philips Semiconductors
Product data sheet
SC28L198
Octal UART for 3.3 V and 5 V supply voltage
2006 Aug 10
7
BLOCK DIAGRAM
Block Diagram SC28C/28L198
HOST
INTERF
ACE
TIMING
AND
BAUD
RA
TE
GENERA
T
O
R
INTERRUPT
ARBITRA
TION
I/O
POR
T
TIMING
AND
INTERF
ACE
FULL DUPLEX UART CHANNEL
INPUT BUFFERS AND OUTPUT DRIVERS
DA
T
A
DRIVERS
AND
MODEM
INTERF
ACE
SD00193
As shown in the block diagram, the Octal UART consists of: an
interrupt arbiter, host interface, timing blocks and eight UART
channel blocks. The eight channels blocks operate independently,
interacting only with the timing, host I/F and interrupt blocks.
FUNCTIONAL DESCRIPTION
The SC28L198 is composed of several functional blocks:
Synchronous host interface block
A timing block consisting of a common baud rate generator
making 22 industry standard baud rates and 2 16–bit counters
used for non–standard baud rate generation
4 identical independent full duplex UART channel blocks
Interrupt arbitration system evaluating 24 contenders
I/O port control section and change of state detectors.
CONCEPTUAL OVERVIEW
Host Interface
The Host interface is comprised of the signal pins CEN, W/RN,
IACKN, DACKN, IRQN Sclk and provides all the control for data
transfer between the external and internal data buses of the host
and the OCTART. The host interface operates in a synchronous
mode with the system (Sclk) which has been designed for a nominal
operating frequency of 33 MHz. The interface operates in either of
two modes; synchronous or asynchronous to the Sclk However
the bus cycle within the OCTART always takes place in four Sclk
cycles after CEN is recognized. These four cycles are the C1, C2,
C3, C4 periods shown in the timing diagrams. DACKN always
occurs in the C4 time and occurs approximately 18 ns after the
rising edge of C4.
Addressing of the various functions of the OCTART is through the
address bus A(7:0). The 28L198 is compatible with the SC28L198
OCTAL UART in software and function. A[7], in a general sense, is
used to separate the data portion of the circuit from the control
portion.
Asynchronous bus cycle
The asynchronous mode requires one bus cycle of the chip select
(CEN) for each read or write to the chip. No more action will occur
on the bus after the C4 time until CEN is returned high.
Synchronous bus cycle
In the synchronous mode a read or write will be done every four
cycles of the Sclk. CEN does not require cycling but must remain
low to keep the synchronous accesses active. This provides a burst
mode of access to the chip.
In both cases each read or write operation(s) will be completed in
four (4) Sclk cycles. The difference in the two modes is only that the
asynchronous mode will not begin another bus cycle if the CEN
remains active after the four internal Sclk have completed. Internally
the asynchronous cycle will terminate after the four periods of Sclk
regardless of how long CEN is held active
In all cases the internal action will terminate at the withdrawal of
CEN. Synchronous CEN cycles shorter than multiples of four Sclk
cycles minus 1 Sclk and asynchronous CEN cycles shorter than four
Sclk cycles may cause short read or write cycles and produce
corrupted data transfers.
Timing Circuits
The timing block consists of a crystal oscillator, a fixed baud rate
generator (BRG), a pair of programmable 16 bit register based
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SC28L198A1BE-S | 功能描述:UART 接口集成电路 3V-5V 8CH UART INTEL/MOT INTRF RoHS:否 制造商:Texas Instruments 通道数量:2 数据速率:3 Mbps 电源电压-最大:3.6 V 电源电压-最小:2.7 V 电源电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:LQFP-48 封装:Reel |
| SC28L198C1A | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Octal UART for 3.3V and 5V supply voltage |
| SC28L201 | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:3.3 V, 5 V UART, 3.125 Mbit/s, with 256-byte FIFO |
| SC28L201A1DGG | 功能描述:UART 接口集成电路 3-5V 1CH UART 3MBPS 256B FIFO RoHS:否 制造商:Texas Instruments 通道数量:2 数据速率:3 Mbps 电源电压-最大:3.6 V 电源电压-最小:2.7 V 电源电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:LQFP-48 封装:Reel |
| SC28L201A1DGG,112 | 功能描述:UART 接口集成电路 3-5V 1CH UART 3MBPS RoHS:否 制造商:Texas Instruments 通道数量:2 数据速率:3 Mbps 电源电压-最大:3.6 V 电源电压-最小:2.7 V 电源电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:LQFP-48 封装:Reel |
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