DS1302 Datasheet – Trickle-Charge Timekeeping Chip

Part Number : DS1302, DS1302S, DS1302Z

Function : Trickle-Charge Timekeeping Chip

Package : 8 Pin PDIP, SO type

Manufacturers : Maxim

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Description :

The DS1302 trickle-charge timekeeping chip contains a real-time clock/calendar and 31 bytes of static RAM. It communicates with a microprocessor via a simple serial interface. The real-time clock/calendar provides seconds, minutes, hours, day, date, month, and year information. The end of the month date is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clock operates in either the 24-hour or 12-hour format with an AM/PM indicator.
Interfacing the DS1302 with a microprocessor is simplified by using synchronous serial communication. Only three wires are required to communicate with the clock/RAM: CE, I/O (data line), and SCLK (serial clock). Data can be transferred to and from the clock/RAM 1 byte at a time or in a burst of up to 31 bytes. The DS1302 is designed to operate on very low power and retain data and clock information on less than 1μW. The DS1302 is the successor to the DS1202. In addition to the basic timekeeping functions of the DS1202, the DS1302 has the additional features of dual power pins for primary and backup power supplies, programmable trickle charger for VCC1, and seven additional bytes of scratchpad memory.


1. Completely Manages All Timekeeping Functions
(1) Real-Time Clock Counts Seconds, Minutes, Hours, Date of the Month, Month, Day of the Week, and Year with Leap-Year Compensation Valid Up to 2100
(2) 31 x 8 Battery-Backed General-Purpose RAM

2. Simple Serial Port Interfaces to Most Microcontrollers
(1) Simple 3-Wire Interface
(2) TTL-Compatible (VCC = 5V)
(3) Single-Byte or Multiple-Byte (Burst Mode) Data Transfer for Read or Write of Clock or RAM Data

3. Low Power Operation Extends Battery Backup Run Time
(1) 2.0V to 5.5V Full Operation
(2) Uses Less Than 300nA at 2.0V


Official Homepage : https://www.maximintegrated.com/en/products/digital/real-time-clocks/DS1302.html


DS1302 PDF Datasheet Download

MF1 Datasheet PDF

Part Number : MF1

Function : general purpose metal film leaded resistor

Manufacturers : Koa Speed Electonics

Images :

MF1 datasheet


Description :

1. Semi-precision metal film resistors
2. The discharge path resistor is recognized by UL 1676 and c-UL (CAS-C22.2 No.1-M94).
3. Meets requirements of MIL-R-22684
4. Suitable for automatic machine insertion
5. MFS two times the power rating of the standard body type
6. Marking: Blue-gray body color with color-coded bands
7. Products with lead-free terminations meet EU RoHS and China RoHS requirements
8. AEC-Q200 Qualified: MF1/4, MFS1/4, MFS1/2

Other data sheets within the file : MF1/2, MF1/4, MF1/4CT52R20RJ-L, MFS1/2

MF1 Datasheet PDF Download

MF1 pdf