DS1339A

7

Maxim Integrated

Pin Configuration

Pin Description

PIN

NAME

FUNCTION

1

X1

Connections for Standard 32.768kHz Quartz Crystal. The internal oscillator circuitry is designed for

For more information about crystal selection and crystal layout considerations, see the Applications

Information section and refer to Application Note 58: Crystal Considerations with Dallas Real-Time Clocks.

2

X2

3

Secondary Power Supply. Supply voltage must be held between 1.3V and 3.7V for proper operation.

This pin can be connected to a primary cell, such as a lithium coin cell. Additionally, this pin can be

connected to a rechargeable cell or a super cap when used in conjunction with the trickle-charge

recognized to ensure against reverse charging current when used with a primary lithium cell. For more

information, visit www.maximintegrated.com/qa/info/ul.

4

GND

Ground

5

SDA

drain output and requires an external pullup resistor. The pull up voltage may be up to 5.5V regardless of

6

SCL

7

SQW/INT

Square-Wave/Interrupt Output. Programmable square-wave or interrupt output signal. The SQW/INT pin

is an open-drain output and requires an external pullup resistor. The pull up voltage may be up to 5.5V

8

Primary Power Supply. When voltage is applied within normal limits, the device is fully accessible and

µSOP

27

SQW/INT

X2

18

+

X1

SCL

36

SDA

GND

TOP VIEW

45

DS1339A