1338C-31SRI8

更新时间： 2024-02-10 16:37:53

品牌	Logo	应用领域
艾迪悌 - IDT		电池时钟
页数	文件大小	规格书
23页	317K
描述
REAL-TIME CLOCK WITH BATTERY BACKED NON-VOLATILE RAM

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数据手册

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1338C-31SRI8 数据手册

IDT1338

REAL-TIME CLOCK WITH BATTERY BACKED NON-VOLATILE RAM

RTC

Pin Assignment (8-pin MSOP/8-pin SOIC)

Pin Assignment (16-pin SOIC)

SCL

SQW/OUT

VCC

SDA

VCC

GND

V_BAT

SQW/OUT

SCL

IDT

1338

V_BAT

GND

IDT

1338C

SDA

Pin Descriptions

Number

Name

Pin Description/Function

8MSOP, 16SOIC

8SOIC

—

Connections for standard 32.768 kHz quartz crystal. The internal oscillator circuitry is designed

for operation with a crystal having a specified load capacitance (CL) of 12.5 pF. An external

32.768 kHz oscillator can also drive the IDT1338. In this configuration, the X1 pin is connected to

the external oscillator signal and the X2 pin is left floating.

V_BAT

Backup Supply Input for Lithium Coin Cell or Other Energy Source. Battery voltage must be held

between the minimum and maximum limits for proper operation. Diodes placed in series

between the backup source and the V_BATpin may prevent proper operation. If a backup supply is

not required, V_BATmust be connected to ground.

GND

SDA

Connect to ground.

Serial data input/output. SDA is the input/output pin for the I²C serial interface. It is an open-drain

output and requires an external pull-up resistor (2 Kohm typical).

SCL

Serial clock input. SCL is used to synchronize data movement on the serial interface. It is an

open-drain output and requires an external pull-up resistor (2 Kohm typical)

SQW/OUT Square-Wave/Output driver. When enabled and the SQWE bit set to 1, the SQW/OUT pin

outputs one of four square-wave frequencies (1 Hz, 4 kHz, 8 kHz, 32 kHz). It is an open drain

output and requires an external pull-up resistor (10K ohm typical). Operates when the device is

powered with VCC or V_BAT

V_CC

Device power supply. When voltage is applied within specified limits, the device is fully

accessible by I²C and data can be written and read.

—

4 - 13

No connect. These pins are unused and must be connected to ground for proper operation.

IDT® REAL-TIME CLOCK WITH BATTERY BACKED NON-VOLATILE RAM

IDT1338

REV K 032910

123 4 5 6 7...23

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