DS1302S-16/T&R

Overview

The DS1302S-16/T&R is a Real-Time Clock (RTC) integrated circuit manufactured by Analog Devices Inc./Maxim Integrated. It provides timekeeping functions including seconds, minutes, hours, date, month, and year with leap-year compensation valid up to the year 2100. The device features 31 bytes of battery-backed static RAM for general-purpose data storage. Communication is handled via a simple 3-wire serial interface compatible with most microcontrollers. It operates within a supply voltage range of 2V to 5.5V and supports both single-byte and burst mode data transfers. The component is housed in a 16-SOIC package.

Feature Summary

• Real-time clock/calendar with leap-year compensation valid up to 2100
• 31 x 8 Battery-Backed General-Purpose RAM
• Simple 3-Wire Serial Interface (CE, I/O, SCLK)
• Low Power Operation: <300nA at 2.0V

Applications

• Microcontroller-based systems requiring precise time tracking
• Data logging devices needing timestamping capabilities
• Battery-operated equipment requiring low standby current
• Industrial control systems with calendar functionality

Procurement Notes

Verify the specific suffix 'T&R' indicates Tape & Reel packaging as per local product fields. Confirm the 16-pin SOIC package variant availability against standard 8-pin datasheet configurations. Check for lead-free/RoHS compliance status indicated by '+' in manufacturer part numbers. Ensure the commercial temperature grade (0°C to +70°C) meets application requirements.

Selection Notes

Select this component when a 3-wire serial RTC is required with 31 bytes of non-volatile RAM. The 16-SOIC package offers surface-mount convenience. Ensure the system design accommodates the dual power pin configuration (VCC1/VCC2) for primary and backup power sources. Verify that the microcontroller can support the synchronous serial protocol timing requirements.

Part Context

The DS1302 series is a successor to the DS1202, offering enhanced features such as dual power pins and a programmable trickle charger. While the standard datasheet highlights 8-pin packages, the DS1302S-16 represents a 16-SOIC variant. The 'S' suffix typically denotes the SO package style, and '-16' specifies the 16-pin configuration. This variant maintains the core RTC functionality while adapting to different footprint requirements.

Replacement Considerations

Direct pin-compatible replacements are not explicitly listed for the 16-SOIC variant in the provided documentation. Standard 8-pin equivalents include DS1302S+ or DS1302Z+. When substituting, verify package dimensions and pinout compatibility. Consider the DS1302SN+ for industrial temperature ranges (-40°C to +85°C) if environmental conditions exceed the commercial grade limits.