Datasheet > 微控制器和处理器 > 计时器或实时时钟> X1288S16I-2.7

X1288S16I-2.7

更新时间： 2024-01-01 04:59:13

品牌	Logo	应用领域
XICOR		计时器或实时时钟微控制器和处理器外围集成电路光电二极管监控可编程只读存储器电动程控只读存储器电可擦编程只读存储器
页数	文件大小	规格书
31页	559K
描述
2-Wire RTC Real Time Clock/Calendar/CPU Supervisor with EEPROM

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技术参数
数据手册

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X1288S16I-2.7 技术参数

是否Rohs认证：	不符合	生命周期：	Transferred
包装说明：	0.300 INCH, PLASTIC, SOIC-16	Reach Compliance Code：	unknown
风险等级：	5.71	Is Samacsys：	N
最大时钟频率：	0.032 MHz	信息访问方法：	I2C
中断能力：	Y	JESD-30 代码：	R-PDSO-G16
JESD-609代码：	e0	长度：	10.35 mm
端子数量：	16	计时器数量：	1
最高工作温度：	85 °C	最低工作温度：	-40 °C
封装主体材料：	PLASTIC/EPOXY	封装代码：	SOP
封装等效代码：	SOP16,.4	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE	电源：	3/5 V
认证状态：	Not Qualified	座面最大高度：	2.65 mm
子类别：	Timer or RTC	最大供电电压：	5.5 V
最小供电电压：	2.7 V	标称供电电压：	5 V
表面贴装：	YES	技术：	CMOS
温度等级：	INDUSTRIAL	端子面层：	Tin/Lead (Sn/Pb)
端子形式：	GULL WING	端子节距：	1.27 mm
端子位置：	DUAL	最短时间：	1/100 SECOND
易失性：	YES	宽度：	7.5 mm
uPs/uCs/外围集成电路类型：	TIMER, REAL TIME CLOCK	Base Number Matches：	1

X1288S16I-2.7 数据手册

Preliminary Information

X1288

APPLICATION SECTION

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

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.

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.

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 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-

Table 7. Crystal Parameters Required for Xicor RTC’s

Parameter

Min

Typ

Max

Units

kHz

ppm

°C

Notes

Frequency

32.768

Freq. Tolerance

100

Down to 20ppm if desired

Turnover Temperature

Typically the value used for most

crystals

Operating Temperature Range

Parallel Load Capacitance

Equivalent Series Resistance

-40

°C

kΩ

12.5

For best oscillator performance

Table 8. Crystal Manufacturers

Manufacturer

Citizen

Part Number

CM201, CM202, CM200S

MC-405, MC-406

RSM-200S-A or B

32S12A or B

Temp Range

-40 to +85°C

-10 to +60°C

-40 to +85°C

+25°C Freq Toler.

20ppm

Epson

Raltron

SaRonix

Ecliptek

ECS

20ppm

ECPSM29T-32.768K

ECX-306/ECX-306I

FSM-327

20ppm

Fox

20ppm

25 of 31

REV 1.1.30 3/24/04

www.xicor.com

1...22 23 242526 27 28...31

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与X1288S16I-2.7相关器件

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X1288S16I-2.7A	INTERSIL	2-Wire⑩ RTC Real Time Clock/Calendar/CPU Supe	获取价格
X1288S16I-2.7A	XICOR	2-Wire RTC Real Time Clock/Calendar/CPU Supervisor with EEPROM	获取价格
X1288S16I-2.7AT1	RENESAS	1 TIMER(S), REAL TIME CLOCK, PDSO16, 0.300 INCH, PLASTIC, SOIC-16	获取价格
X1288S16I-2.7T1	RENESAS	1 TIMER(S), REAL TIME CLOCK, PDSO16, 0.300 INCH, PLASTIC, SOIC-16	获取价格
X1288S16I-4.5A	INTERSIL	2-Wire⑩ RTC Real Time Clock/Calendar/CPU Supe	获取价格
X1288S16I-4.5A	XICOR	2-Wire RTC Real Time Clock/Calendar/CPU Supervisor with EEPROM	获取价格

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