Datasheet > X1288V14IZT1

X1288V14IZT1

更新时间： 2024-01-20 18:15:11

品牌	Logo	应用领域
瑞萨 - RENESAS		时钟光电二极管外围集成电路
页数	文件大小	规格书
27页	433K
描述
1 TIMER(S), REAL TIME CLOCK, PDSO14, ROHS COMPLIANT, PLASTIC, TSSOP-14

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X1288V14IZT1 技术参数

是否Rohs认证：	符合	生命周期：	Obsolete
零件包装代码：	TSSOP	包装说明：	TSSOP-14
针数：	14	Reach Compliance Code：	unknown
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
风险等级：	5.65	最大时钟频率：	0.032 MHz
信息访问方法：	I2C	JESD-30 代码：	R-PDSO-G14
JESD-609代码：	e3	长度：	5 mm
湿度敏感等级：	5	端子数量：	14
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：	TSSOP	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH	峰值回流温度（摄氏度）：	260
认证状态：	Not Qualified	座面最大高度：	1.2 mm
最大供电电压：	5.5 V	最小供电电压：	4.5 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：	Matte Tin (Sn)	端子形式：	GULL WING
端子节距：	0.65 mm	端子位置：	DUAL
处于峰值回流温度下的最长时间：	NOT SPECIFIED	宽度：	4.4 mm
uPs/uCs/外围集成电路类型：	TIMER, REAL TIME CLOCK	Base Number Matches：	1

X1288V14IZT1 数据手册

X1288

from the X1 and X2 pins. Also, minimizing the switch-

ing current at this pin by careful selection of the pullup

resistor value will reduce noise. Intersil suggests a

minimum value of 5.1k for 32.768kHz, and higher val-

ues (i.e. 20kΩ) for lower frequency PHZ outputs.

setting an alarm for each minute. Using the pulse

interrupt mode setting, the once-per-minute interrupt

functions as an indication of proper oscillation.

Backup Battery Operation

Many types of batteries can be used with the Intersil

RTC products. 3.0V or 3.6V Lithium batteries are

appropriate, and sizes are available that can power a

Intersil RTC device for up to 10 years. Another option

is to use a supercapacitor for applications where Vcc

may disappear intermittently for short periods of time.

Depending on the value of supercapacitor used,

backup time can last from a few days to two weeks

(with >1F). A simple silicon or Schottky barrier diode

can be used in series with Vcc to charge the superca-

pacitor, which is connected to the Vback pin. Do not

use the diode to charge a battery (especially lithium

batteries!).

For other RTC products, the same rules stated above

should be observed, but adjusted slightly since the

packages and pinouts are slightly different.

Assembly

Most electronic circuits do not have to deal with

assembly issues, but with the RTC devices assembly

includes insertion or soldering of a live battery into an

unpowered circuit. If a socket is soldered to the board,

and a battery is inserted in final assembly, then there

are no issues with operation of the RTC. If the battery

is soldered to the board directly, then the RTC device

Vback pin will see some transient upset from either

soldering tools or intermittent battery connections

which can stop the circuit from oscillating. Once the

battery is soldered to the board, the only way to assure

the circuit will start up is to momentarily (very short

period of time!) short the Vback pin to ground and the

circuit will begin to oscillate.

2.7-5.5V

V_CC

V_back

Supercapacitor

V_SS

Oscillator Measurements

When a proper crystal is selected and the layout

guidelines above are observed, the oscillator should

start up in most circuits in less than one second. Some

circuits may take slightly longer, but startup should

definitely occur in less than 5 seconds. When testing

RTC circuits, the most common impulse is to apply a

scope probe to the circuit at the X2 pin (oscillator out-

put) and observe the waveform. DO NOT DO THIS!

Although in some cases you may see a useable wave-

form, due to the parasitics (usually 10pF to ground)

applied with the

FIGURE 20. SUPERCAPACTOR CHARGING CIRCUIT

Since the battery switchover occurs at Vcc=Vback-

0.1V (see Figure 20), the battery voltage must always

be lower than the Vcc voltage during normal operation

or the battery will be drained. A second consideration

is the trip point setting for the system RESET- func-

tion, known as Vtrip. Vtrip is set at the factory at levels

for systems with either Vcc = 5V or 3.3V operation,

with the following standard options:

scope probe, there will be no useful information in that

waveform other than the fact that the circuit is oscillat-

ing. The X2 output is sensitive to capacitive imped-

ance so the voltage levels and the frequency will be

affected by the parasitic elements in the scope probe.

Applying a scope probe can possibly cause a faulty

oscillator to start up, hiding other issues (although in

the Intersil RTC’s, the internal circuitry assures startup

when using the proper crystal and layout).

= 4.63V ± 3%

= 4.38V ± 3%

= 2.85V ± 3%

= 2.65V ± 3%

TRIP

The best way to analyze the RTC circuit is to power it

up and read the real time clock as time advances, or if

the chip has the PHZ output, look at the output of that

pin on an oscilloscope (after enabling it with the con-

trol register). Alternatively, the X1226/1286/1288

devices have an IRQ- output which can be checked by

FN8102.3

April 14, 2006

1...21 22 232425 26 27

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与X1288V14IZT1相关器件

型号	品牌	获取价格	描述	数据表
X1288V14Z	INTERSIL	获取价格	2-Wire⑩ RTC Real Time Clock/Calendar/CPU Supe
X1288V14Z-2.7	INTERSIL	获取价格	2-Wire⑩ RTC Real Time Clock/Calendar/CPU Supe
X1288V14Z-2.7A	INTERSIL	获取价格	2-Wire⑩ RTC Real Time Clock/Calendar/CPU Supe
X1288V14Z-4.5A	INTERSIL	获取价格	2-Wire⑩ RTC Real Time Clock/Calendar/CPU Supe
X1288V14Z-4.5AT1	RENESAS	获取价格	1 TIMER(S), REAL TIME CLOCK, PDSO14, ROHS COMPLIANT, PLASTIC, TSSOP-14
X12M288000L199	AEL	获取价格	Parallel - Fundamental Quartz Crystal,
X13005	STMICROELECTRONICS	获取价格	HIGH VOLTAGE FAST-SWITCHING NPN POWER TRANSISTOR
X130C	ETC	获取价格	CRYSTAL
X130K	ETC	获取价格	CRYSTAL OSCILLATOR 16.384000MHZ
X131310H	XFMRS	获取价格	HDSL LINE DRIVER XFMR

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