SLM1302

The SLM1302 trickle charge timekeeping chip incorporates a real-time clock/calendar and 31 bytes of static RAM (SRAM). 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. End-of-month dates are automatically adjusted for months with fewer than 31 days, including leap year correction. The clock can operate in either 24-hour or 12-hour format with an AM/PM indicator. By using synchronous serial communication, the interface between the SLM1302 and the microprocessor is simplified. Only three wires are required for clock/RAM communication: (1) RST (Reset), (2) I/O (Data Line), and (3) SCLK (Serial Clock).

Key features

• Real-time clock counts seconds, minutes, hours, date of month, day of week, and year with leap-year compensation valid through 2100
• 31×8 RAM
• Serial I/O with minimum pin count
• Full operating range: 2 ~ 5.5V
• Power consumption less than 300nA at 2.5V or lower
• Single-byte or multi-byte data transfer
• Available in SOIC8, SOP8, or DIP8 package
• Simple 3-wire interface
• TTL-compatible
• Optional industrial temperature range: -40℃ ~ 85℃