Datasheet > 1337GDCGK8

1337GDCGK8

更新时间： 2024-02-18 04:44:01

品牌	Logo	应用领域
艾迪悌 - IDT		时钟光电二极管外围集成电路
页数	文件大小	规格书
28页	278K
描述
Real Time Clock, 1 Timer(s), PDSO8, 0.150 INCH, ROHS COMPLIANT, SOIC-8

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1337GDCGK8 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Obsolete	零件包装代码：	SOIC
包装说明：	0.150 INCH, ROHS COMPLIANT, SOIC-8	针数：	8
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：	0.4 MHz	信息访问方法：	I2C
中断能力：	Y	JESD-30 代码：	R-PDSO-G8
JESD-609代码：	e3	长度：	4.9 mm
湿度敏感等级：	1	位数：	8
端子数量：	8	计时器数量：	1
最高工作温度：	105 °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：	SOP8,.25	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE	峰值回流温度（摄氏度）：	260
电源：	2/5 V	认证状态：	Not Qualified
座面最大高度：	1.75 mm	子类别：	Timer or RTC
最大供电电压：	5.5 V	最小供电电压：	1.8 V
标称供电电压：	3.3 V	表面贴装：	YES
技术：	CMOS	温度等级：	INDUSTRIAL
端子面层：	Matte Tin (Sn) - annealed	端子形式：	GULL WING
端子节距：	1.27 mm	端子位置：	DUAL
最短时间：	SECONDS	处于峰值回流温度下的最长时间：	30
宽度：	3.9 mm	uPs/uCs/外围集成电路类型：	TIMER, REAL TIME CLOCK
Base Number Matches：	1

1337GDCGK8 数据手册

IDT1337G

REA LTIME CLOCK WITH SERIAL INTERFACE

RTC

Typical Operating Circuit

CRYSTAL

V_CC

10k

SCL

SQW/INTB

CPU

IDT1337G

INTA

SDA

GND

Detailed Description

Communications to and from the IDT1337G occur serially

over an I C bus. The IDT1337G operates as a slave device

Effective Load Capacitance

Please see diagram below for effective load capacitance

calculation. The effective load capacitance (CL) should

match the recommended load capacitance of the crystal in

order for the crystal to oscillate at its specified parallel

resonant frequency with 0ppm frequency error.

on the serial bus. Access is obtained by implementing a

START condition and providing a device identification code,

followed by data. Subsequent registers can be accessed

sequentially until a STOP condition is executed. The device

is fully accessible through the I C interface whenever VCC

is between 5.5 V and 1.8 V. I C operation is not guaranteed

when VCC is below 1.8 V. The IDT1337G maintains the time

and date when VCC is as low as 1.3 V.

The following sections discuss in detail the Oscillator block,

Clock/Calendar Register Block and Serial I C block.

Oscillator Block

Selection of the right crystal, correct load capacitance and

careful PCB layout are important for a stable crystal

oscillator. Due to the optimization for the lowest possible

current in the design for these oscillators, losses caused by

parasitic currents can have a significant impact on the

overall oscillator performance. Extra care needs to be taken

to maintain a certain quality and cleanliness of the PCB.

Crystal Selection

The key parameters when selecting a 32 kHz crystal to work

with IDT1337G RTC are:

In the above figure, X1 and X2 are the crystal pins of our

device. Cin1 and Cin2 are the internal capacitors which

include the X1 and X2 pin capacitance. Cex1 and Cex2 are

the external capacitors that are needed to tune the crystal

frequency. Ct1 and Ct2 are the PCB trace capacitances

between the crystal and the device pins. CS is the shunt

capacitance of the crystal (as specified in the crystal

manufacturer's datasheet or measured using a network

analyzer).

• Recommended Load Capacitance

• Crystal Effective Series Resistance (ESR)

• Frequency Tolerance

IDT® REAL-TIME CLOCK WITH I C SERIAL INTERFACE

IDT1337G

REV L 062613

1 2 345 6 7...28

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