- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄3763 > XR16C2850IJ-F (Exar Corporation)IC UART FIFO 128B 44PLCC PDF資料下載
參數(shù)資料
| 型號(hào)： | XR16C2850IJ-F |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 11/51頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC UART FIFO 128B 44PLCC |
| 標(biāo)準(zhǔn)包裝： | 27 |
| 特點(diǎn)： | * |
| 通道數(shù)： | 2，DUART |
| FIFO's： | 128 字節(jié) |
| 規(guī)程： | RS232，RS485 |
| 電源電壓： | 2.97 V ~ 5.5 V |
| 帶自動(dòng)流量控制功能： | 是 |
| 帶IrDA 編碼器/解碼器： | 是 |
| 帶故障啟動(dòng)位檢測功能： | 是 |
| 帶調(diào)制解調(diào)器控制功能： | 是 |
| 帶CMOS： | 是 |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 44-LCC（J 形引線） |
| 供應(yīng)商設(shè)備封裝： | 44-PLCC（16.59x16.59） |
| 包裝： | 管件 |
| 其它名稱： | 1016-1567-5 XR16C2850IJ-F-ND |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁當(dāng)前第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁
xr
XR16C2850
REV. 2.1.3
2.97V TO 5.5V DUAL UART WITH 128-BYTE FIFOS
19
2.19
Sleep Mode with Auto Wake-Up
The 2850 supports low voltage system designs, hence, a sleep mode is included to reduce its power
consumption when the chip is not actively used.
All of these conditions must be satisfied for the 2850 to enter sleep mode:
■ no interrupts pending for both channels of the 2850 (ISR bit-0 = 1)
■ sleep mode of both channels are enabled (IER bit-4 = 1)
■ modem inputs are not toggling (MSR bits 0-3 = 0)
■ RX input pin of both channels are idling at a logic 1
The 2850 stops its crystal oscillator to conserve power in the sleep mode. User can check the XTAL2 pin for
no clock output as an indication that the device has entered the sleep mode.
The 2850 resumes normal operation by any of the following:
■ a receive data start bit transition (HIGH to LOW)
■ a data byte is loaded to the transmitter, THR or FIFO
■ a change of logic state on any of the modem or general purpose serial inputs: CTS#, DSR#, CD#, RI#
If the 2850 is awakened by any one of the above conditions, it will return to the sleep mode automatically after
all interrupting conditions have been serviced and cleared. If the 2850 is awakened by the modem inputs, a
read to the MSR is required to reset the modem inputs. In any case, the sleep mode will not be entered while
an interrupt is pending from channel A or B. The 2850 will stay in the sleep mode of operation until it is disabled
by setting IER bit-4 to a logic 0.
If the address lines, data bus lines, IOW#, IOR#, CSA#, CSB#, and modem input lines remain steady when the
2850 is in sleep mode, the maximum current will be in the microamp range as specified in the DC Electrical
Characteristics on page 38. If the input lines are floating or are toggling while the 2850 is in sleep mode, the
current can be up to 100 times more. If any of those signals are toggling or floating, then an external buffer
would be required to keep the address, data and control lines steady to achieve the low current.
A word of caution: owing to the starting up delay of the crystal oscillator after waking up from sleep mode, the
first few receive characters may be lost. The number of characters lost during the restart also depends on your
operating data rate. More characters are lost when operating at higher data rate. Also, it is important to keep
RX A/B inputs idling HIGH or “marking” condition during sleep mode to avoid receiving a “break” condition
upon the restart. This may occur when the external interface transceivers (RS-232, RS-485 or another type)
are also put to sleep mode and cannot maintain the “marking” condition. To avoid this, the designer can use a
47k-100k ohm pull-up resistor on the RXA and RXB pins.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ST16C554DIJ68-F | IC UART FIFO 16B QUAD 68PLCC |
| XR16C850IJ-F | IC UART FIFO 128B 44PLCC |
| ST16C2552IJ44-F | IC UART FIFO 16B DUAL 44PLCC |
| ST16C2552CJ44-F | IC UART FIFO 16B DUAL 44PLCC |
| XR88C681CJ-F | IC UART CMOS DUAL 44PLCC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XR16C2850IJTR-F | 功能描述:UART 接口集成電路 UART RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel |
| XR16C2850IM | 制造商:EXAR 制造商全稱:EXAR 功能描述:2.97V TO 5.5V DUAL UART WITH 128-BYTE FIFOS |
| XR16C2850IM48 | 制造商:EXAR 制造商全稱:EXAR 功能描述:3.3V AND 5V DUART WITH 128-BYTE FIFO |
| XR16C2850IM-F | 功能描述:UART 接口集成電路 2.97V-5.5V 128B FIFO temp -45 to 85C;UART RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel |
| XR16C2850IMTR-F | 制造商:Exar Corporation 功能描述:XR16C2850IMTR-F |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。