IDT1337G

REAL-TIME CLOCK WITH I2C SERIAL INTERFACE

RTC

IDT® REAL-TIME CLOCK WITH I2C SERIAL INTERFACE

3

IDT1337G

REV M 073013

Pin Descriptions

Pin Number

Pin

Name

Pin Description/Function

MSOP

SOIC

QFN

1

—

14

X1

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 7 pF. An external 32.768 kHz oscillator can also drive the

IDT1337G. In this configuration, the X1 pin is connected to the external

oscillator signal and the X2 pin is left floating.

2—

15

X2

314

2

INTA

Interrupt output. When enabled, INTA is asserted low when the time/day/date

matches the values set in the alarm registers. This pin is an open-drain output

and requires an external pull-up resistor (10 k

 typical).

4

15

3

GND

Connect to ground. DC power is provided to the device on these pins.

5

16

6

SDA

Serial data input/output. SDA is the input/output pin for the I2C serial interface.

The SDA pin is an open-drain output and requires an external pull-up resistor

(2 k

 typical).

6

1

7

SCL

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

interface. The SCL pin is an open-drain output and requires an external pull-up

resistor (2 k

 typical).

7

2

10

SQW/INTB

Square-Wave/Interrupt output. Programmable square-wave or interrupt output

signal. The SQW/INT pin is an open-drain output and requires an external

pull-up resistor (10 k

 typical). This pin can also function as an additional

interrupt pin under certain conditions (see page 6 for details).

8

3

11

VCC

Primary power supply. DC power is applied to this pin.

—

4 - 13

1,4,5,8,9,

12,13,16

NC

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