參數(shù)資料
型號： XR17V254IV-F
廠商： Exar Corporation
文件頁數(shù)： 15/70頁
文件大?。?/td> 0K
描述： IC UART PCI BUS QUAD 144LQFP
標準包裝： 60
特點： *
通道數(shù)： 4，QUART
FIFO's： 64 字節(jié)
規(guī)程： RS485
電源電壓： 3.3V，5V
帶自動流量控制功能： 是
帶IrDA 編碼器/解碼器： 是
帶故障啟動位檢測功能： 是
帶調(diào)制解調(diào)器控制功能： 是
安裝類型： 表面貼裝
封裝/外殼： 144-LQFP
供應(yīng)商設(shè)備封裝： 144-LQFP（20x20）
包裝： 托盤
XR17V254
22
66MHZ PCI BUS QUAD UART WITH POWER MANAGEMENT SUPPORT
REV. 1.0.1
1.6.6
SLEEP [31:24] (default 0x00)
The 8-bit Sleep register enables each UART separately to enter Sleep mode. Sleep mode reduces power
consumption when the system needs to put the UART(s) to idle. The UART enters sleep mode when the
following conditions are satisfied after the sleep mode is enabled (LOW (default) is to disable and logic HIGH is
to enable sleep mode):
■ There is no pending interrupt
■ RX pin is idling at a HIGH in normal mode or a LOW in infrared mode
■ The modem inputs (CTS#, DSR#, CD# and RI#) are steady at either HIGH or LOW (MSR bits [3:0] =
0000)
When all 4 UART channels are put to sleep, the on-chip oscillator shuts off to further conserve power. In this
case, the V254 is awakened by any of the following events occurring at any of the 4 UART channels:
■ A receive data start bit transition (HIGH to LOW in normal mode or from LOW to HIGH in infrared mode)
■ A data byte is loaded into the transmitter
■ A change of logic state on any of the modem inputs, i.e. any of the delta bits (MSR bits[7:4]) is set
The V254 is ready after 32 crystal clocks to ensure full functionality. Therefore, if the V254 is awakened by a
receive data start bit transition, that character (and the subsequent few characters) may not be received
correctly. Also, a special interrupt is generated with an indication of no pending interrupt. The V254 will return
to sleep mode automatically after all interrupting conditions have been serviced and cleared. It will stay in the
sleep mode of operation until it is disabled by resetting the SLEEP register bits.
1.6.7
Device Identification and Revision
There are two internal registers that provide device identification and revision, DVID and DREV registers. The
8-bit content in the DVID register provides device identification. A return value of 0x44 from this register
indicates the device is a XR17V254. The DREV register returns an 8-bit value of 0x01 for revision A with 0x02
equals to revision B and so on. This information is very useful to the software driver for identifying which device
it is communicating with and to keep up with revision changes.
DVID [15:8]
Device identification for the type of UART. The Device ID of the XR17V254 is 0x44.
DREV [7:0]
Revision number of the XR17V254. A 0x01 represents "revision-A" with 0x02 for rev-B and so on.
SLEEP Register
Individual UART Channel Sleep Enable
Bit-7 Bit-6 Bit-5 Bit-4 Bit-3 Bit-2 Bit-1 Bit-0
Rsvd
Ch-3 Ch-2 Ch-1 Ch-0
Rsvd Rsvd Rsvd
相關(guān)PDF資料
PDF描述
XR17V258IV-F IC UART PCI BUS OCTAL 144LQFP
XR17V352IB113-F IC UART PCIE 256B DUAL 113FPBGA
XR17V354IB176-F IC UART PCIE 256B QUAD 176FPBGA
XR17V358IB176-F IC UART PCIE OCTAL 176FPBGA
XR19L200IL32-F IC UART/TXRX RS232 32QFN
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
XR17V258 制造商:EXAR 制造商全稱:EXAR 功能描述:66MHZ PCI BUS OCTAL UART WITH POWER MANAGEMENT SUPPORT
XR17V258_08 制造商:EXAR 制造商全稱:EXAR 功能描述:66MHZ PCI BUS OCTAL UART WITH POWER MANAGEMENT SUPPORT
XR17V258IV 功能描述:UART 接口集成電路 66MHz Octal PCI 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
XR17V258IV-0A-EVB 功能描述:UART 接口集成電路 Supports V258 144 ld TQFP, PCI Interface 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
XR17V258IVF 制造商:Exar Corporation 功能描述:
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*