参数资料
| 型号： | XR16C854CQ-F |
| 厂商： | Exar Corporation |
| 文件页数： | 3/53页 |
| 文件大小： | 0K |
| 描述： | IC UART FIFO 128B QUAD 100QFP |
| 标准包装： | 66 |
| 特点： | * |
| 通道数： | 4，QUART |
| FIFO's： | 128 字节 |
| 规程： | RS232，RS485 |
| 电源电压： | 2.97 V ~ 5.5 V |
| 带自动流量控制功能： | 是 |
| 带IrDA 编码器/解码器： | 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-BQFP |
| 供应商设备封装： | 100-QFP（14x20） |
| 包装： | 托盘 |
| 其它名称： | 1016-1447 1016-1447-ND 1016-1654 XR16C854CQ-F-ND |
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XR16C854/854D
11
REV. 3.1.0
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
2.2
5-Volt Tolerant Inputs
For devices that have top mark date code "F2 YYWW" and newer, the 854 can accept a voltage of up to 5.5V
on any of its inputs (except XTAL1) when operating from 2.97V to 5.5V. XTAL1 is not 5 volt tolerant. Devices
that have top mark date code "DC YYWW" and older do not have 5V tolerant inputs.
2.3
Device Reset
The RESET input resets the internal registers and the serial interface outputs in all four channels to their
default state (see Table 19). An active high pulse of longer than 40 ns duration will be required to activate the
reset function in the device. Following a power-on reset or an external reset, the 854 is software compatible
with previous generation of UARTs, 16C454 and 16C554 and 16C654.
2.4
Device Identification and Revision
The XR16C854 provides a Device Identification code and a Device Revision code to distinguish the part from
other devices and revisions. To read the identification code from the part, it is required to set the baud rate
generator registers DLL and DLM both to 0x00. Now reading the content of the DLM will provide 0x14 for the
XR16C854 and reading the content of DLL will provide the revision of the part; for example, a reading of 0x01
means revision A.
2.5
Channel Selection
The UART provides the user with the capability to bi-directionally transfer information between an external
CPU and an external serial communication device. During Intel Bus Mode (16/68# pin is connected to VCC), a
logic 0 on chip select pins, CSA#, CSB#, CSC# or CSD# allows the user to select UART channel A, B, C or D
to configure, send transmit data and/or unload receive data to/from the UART. Selecting all four UARTs can be
useful during power up initialization to write to the same internal registers, but do not attempt to read from all
four uarts simultaneously. Individual channel select functions are shown in Table 1 below.
During Motorola Bus Mode (16/68# pin is connected to GND), the package interface pins are configured for
connection with Motorola, and other popular microprocessor bus types. In this mode the 854 decodes two
additional addresses, A3 and A4, to select one of the four UART ports. The A3 and A4 address decode
function is used only when in the Motorola Bus Mode. See Table 2 below.
TABLE 1: CHANNEL A-D SELECT IN 16 MODE
CSA#
CSB#
CSC#
CSD#
FUNCTION
1
UART de-selected
0
1
Channel A selected
1
0
1
Channel B selected
1
0
1
Channel C selected
1
0
Channel D selected
0
Channels A-D selected
TABLE 2: CHANNEL A-D SELECT IN 68 MODE
CS#
A4
A3
FUNCTION
1
N/A
UART de-selected
0
Channel A selected
0
1
Channel B selected
0
1
0
Channel C selected
0
1
Channel D selected
相关PDF资料 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| XR16C854CQTR-F | 功能描述:UART 接口集成电路 UART 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 |
| XR16C854CV | 制造商:EXAR 制造商全称:EXAR 功能描述:QUAD UART WITH RX/TX FIFO COUNTERS,128-BYTE FIFO |
| XR16C854CV-0A-EVB | 功能描述:UART 接口集成电路 Supports C854 64 ld TQFP, ISA Interface 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 |
| XR16C854CV-F | 功能描述:UART 接口集成电路 UART 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 |
| XR16C854CVTR-F | 功能描述:UART 接口集成电路 UART 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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