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DS1305 3-Wire/SPI Serial Interface Real-Time Clock - Buy DS1305

DS1305 - DS1305 Real-Time Clock


arrowReal-time clock counts seconds, minutes, hours, date, month, day, year, and leap year to 2100

arrow96-byte, battery-backed, nonvolatile (NV) RAM for data storage

arrowTwo time of day Alarms

arrowSerial interface SPI or standard 3-wire interface

arrowDual-power supply pins for primary and backup power supplies

arrowOptional trickle charge output to Backup Supply

arrowUnderwriters Laboratory (UL) Recognized

Pin Layout
DS1305 Pin Layout

Pin Description
Pin Number Description
1 Vcc2 - Backup Power Supply
2 Vbat - +3V Battery Input
3 X1 - 32.768kHz Crystal
4 X2 - 32.768kHz Crystal
5 NC - Not Connected
6 INT0 - Interrupt 0 Output
7 INT1 - Interrupt 1 Output
8 GND - Ground
9 SEMODE - Serial Interface Mode
10 CE - Chip Enable
11 SCLK - Serial Clock
12 SDI - Serial Data In
13 SDO - Serial Data Out
14 Vccif - Interface Logic Power Supply Input
15 PF - Power Fail Output
16 Vcc1 - Primary Power Supply

Dimensional Drawing
DS1305 DIP16 Dimension Drawing
DS1305 DIP16 Dimension Drawing

Technical Data


Maxim Integrated Website - Datasheet for DS1305 DS1305 Datasheet

Application Notes