參數(shù)資料
型號(hào)： X1288S16I
元件分類： CPU監(jiān)測(cè)
英文描述： RTC Module With CPU Supervisor
中文描述： 時(shí)鐘模塊CPU監(jiān)控
文件頁(yè)數(shù)： 25/31頁(yè)
文件大?。?/td> 560K
代理商： X1288S16I
25 of 31
REV 1.1.30 3/24/04
www.xicor.com
Preliminary Information
X1288
APPLICATION SECTION
CRYSTAL OSCILLATOR AND TEMPERATURE
COMPENSATION
Xicor has now integrated the oscillator compensation
circuity on-chip, to eliminate the need for external com-
ponents and adjust for crystal drift over temperature
and enable very high accuracy time keeping (<5ppm
drift).
The Xicor RTC family uses an oscillator circuit with on-
chip crystal compensation network, including adjust-
able load-capacitance. The only external component
required is the crystal. The compensation network is
optimized for operation with certain crystal parameters
which are common in many of the surface mount or
tuning-fork crystals available today. Table 7 summa-
rizes these parameters.
Table 8 contains some crystal manufacturers and part
numbers that meet the requirements for the Xicor RTC
products.
The turnover temperature in Table 7 describes the
temperature where the apex of the of the drift vs. tem-
perature curve occurs. This curve is parabolic with the
drift increasing as (T-T0)
2
. For an Epson MC-405
device, for example, the turnover temperature is typi-
cally 25 deg C, and a peak drift of >110ppm occurs at
the temperature extremes of –40 and +85 deg C. It is
possible to address this variable drift by adjusting the
load capacitance of the crystal, which will result in pre-
dictable change to the crystal frequency. The Xicor
RTC family allows this adjustment over temperature
since the devices include on-chip load capacitor trim-
ming. This control is handled by the Analog Trimming
Register, or ATR, which has 6 bits of control . The load
capacitance range covered by the ATR circuit is
approximately 3.25pF to 18.75pF, in 0.25pf incre-
ments. Note that actual capacitance would also
include about 2pF of package related capacitance. In-
circuit tests with commercially available crystals dem-
onstrate that this range of capacitance allows fre-
quency control from +116ppm to –37ppm, using a
12.5pF load crystal.
In addition to the analog compensation afforded by the
adjustable load capacitance, a digital compensation
feature is available for the Xicor RTC family. There are
three bits known as the Digital Trimming Register or
DTR, and they operate by adding or skipping pulses in
the clock signal. The range provided is ±30ppm in
increments of 10ppm. The default setting is 0ppm. The
DTR control can be used for coarse adjustments of
frequency drift over temperature or for crystal initial
accuracy correction.
Table 7. Crystal Parameters Required for Xicor RTC’s
Table 8. Crystal Manufacturers
Parameter
Min
Typ
32.768
Max
Units
kHz
ppm
°C
Notes
Frequency
Freq. Tolerance
Turnover Temperature
±100
30
Down to 20ppm if desired
Typically the value used for most
crystals
20
25
Operating Temperature Range
Parallel Load Capacitance
Equivalent Series Resistance
-40
85
°C
pF
k
12.5
50
For best oscillator performance
Manufacturer
Citizen
Epson
Raltron
SaRonix
Ecliptek
ECS
Fox
Part Number
Temp Range
-40 to +85°C
-40 to +85°C
-40 to +85°C
-40 to +85°C
-10 to +60°C
-10 to +60°C
-40 to +85°C
+25°C Freq Toler.
±20ppm
±20ppm
±20ppm
±20ppm
±20ppm
±20ppm
±20ppm
CM201, CM202, CM200S
MC-405, MC-406
RSM-200S-A or B
32S12A or B
ECPSM29T-32.768K
ECX-306/ECX-306I
FSM-327
相關(guān)PDF資料
PDF描述
X1288S16I-2.7 RTC Module With CPU Supervisor
X1288S16I-2.7A RTC Module With CPU Supervisor
X1288S16I-4.5A RTC Module With CPU Supervisor
X1288V14 RTC Module With CPU Supervisor
X1288V14-2.7 RTC Module With CPU Supervisor
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
X1288S16I-2.7 功能描述:IC RTC/CAL/CPU SUP EE 16-SOIC RoHS:否 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 實(shí)時(shí)時(shí)鐘 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 類型:時(shí)鐘/日歷 特點(diǎn):警報(bào)器，閏年，SRAM 存儲(chǔ)容量:- 時(shí)間格式:HH:MM:SS（12/24 小時(shí)） 數(shù)據(jù)格式:YY-MM-DD-dd 接口:SPI 電源電壓:2 V ~ 5.5 V 電壓 - 電源，電池:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-WDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:8-TDFN EP 包裝:管件
X1288S16I-2.7A 功能描述:IC RTC/CAL/CPU SUP EE 16-SOIC RoHS:否 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 實(shí)時(shí)時(shí)鐘 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 類型:時(shí)鐘/日歷 特點(diǎn):警報(bào)器，閏年，SRAM 存儲(chǔ)容量:- 時(shí)間格式:HH:MM:SS（12/24 小時(shí)） 數(shù)據(jù)格式:YY-MM-DD-dd 接口:SPI 電源電壓:2 V ~ 5.5 V 電壓 - 電源，電池:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-WDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:8-TDFN EP 包裝:管件
X1288S16I-2.7AT1 功能描述:IC RTC/CAL/CPU SUP EE 16-SOIC RoHS:否 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 實(shí)時(shí)時(shí)鐘 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 類型:時(shí)鐘/日歷 特點(diǎn):警報(bào)器，閏年，SRAM 存儲(chǔ)容量:- 時(shí)間格式:HH:MM:SS（12/24 小時(shí)） 數(shù)據(jù)格式:YY-MM-DD-dd 接口:SPI 電源電壓:2 V ~ 5.5 V 電壓 - 電源，電池:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-WDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:8-TDFN EP 包裝:管件
X1288S16I-2.7T1 功能描述:IC RTC/CAL/CPU SUP EE 16-SOIC RoHS:否 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 實(shí)時(shí)時(shí)鐘 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 類型:時(shí)鐘/日歷 特點(diǎn):警報(bào)器，閏年，SRAM 存儲(chǔ)容量:- 時(shí)間格式:HH:MM:SS（12/24 小時(shí)） 數(shù)據(jù)格式:YY-MM-DD-dd 接口:SPI 電源電壓:2 V ~ 5.5 V 電壓 - 電源，電池:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-WDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:8-TDFN EP 包裝:管件
X1288S16I-4.5A 功能描述:IC RTC/CAL/CPU SUP EE 16-SOIC RoHS:否 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 實(shí)時(shí)時(shí)鐘 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 類型:時(shí)鐘/日歷 特點(diǎn):警報(bào)器，閏年，SRAM 存儲(chǔ)容量:- 時(shí)間格式:HH:MM:SS（12/24 小時(shí)） 數(shù)據(jù)格式:YY-MM-DD-dd 接口:SPI 電源電壓:2 V ~ 5.5 V 電壓 - 電源，電池:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-WDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:8-TDFN EP 包裝:管件
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*