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DS1308U-3+ Datasheet(PDF) 7 Page - Maxim Integrated Products |
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DS1308U-3+ Datasheet(HTML) 7 Page - Maxim Integrated Products |
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7 / 16 page  ����������������������������������������������������������������� Maxim Integrated Products 7 DS1308 Low-Current I2C RTC with 56-Byte NV RAM Pin Configuration Pin Description PIN NAME FUNCTION 1 X1 32.768kHz Crystal Connections. The internal oscillator circuitry is designed for use with a crystal having a specified load capacitance (CL) of 6pF. Note: For more information about crystal selection and crystal layout considerations, refer to Application Note 58: Crystal Considerations with Maxim Real-Time Clocks (RTCs). 2 X2 3 VBAT Battery Supply Input for Lithium 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 VBAT pin can prevent proper operation. If a backup supply is not required, VBAT must be grounded. UL recognized to ensure against reverse charging when used with a lithium cell. 4 GND Ground 5 SDA Serial Data Input/Output for the I2C serial interface. It is an open-drain output and requires an external pullup resistor. The pullup voltage can be up to 5.5V, regardless of the voltage on VCC. 6 SCL Serial Clock Input for the I2C serial interface. Used to synchronize data movement on the serial interface. The pullup voltage can be up to 5.5V, regardless of the voltage on VCC. 7 SQW/CLKIN Square-Wave Output/Clock Input. This I/O pin is used to output one of four square-wave frequencies (1Hz, 4kHz, 8kHz, 32kHz) or accept an external clock input to drive the RTC counter. In the output mode (ECLK = 0), it is open drain and requires an external pullup resistor. The square-wave operates on VCC, or on VBAT with BBCLK = 1. The pullup voltage can be up to 5.5V, regardless of the voltage on VCC. If not used, this pin may be left unconnected. 8 VCC Primary Power Supply. Decouple the power supply with a 0.1FF capacitor to ground. µSOP 27 SQW/CLKIN X2 18 VCC X1 SCL VBAT 36 SDA GND 45 DS1308 TOP VIEW + |
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