DS1337C#T&R

Overview

The DS1337C#T&R is a low-power I2C serial real-time clock/calendar manufactured by Analog Devices Inc./Maxim Integrated. It features an integrated 32,768Hz crystal within a 16-pin SO package (300 mils). The device supports full operation with VCC between 1.8V and 5.5V, maintaining timekeeping down to 1.3V. Key electrical parameters include an active supply current of 150 µA, standby current of 1.5 µA, and timekeeping current ranging from 425 nA to 600 nA. It provides two programmable alarms, a square-wave output, and automatic leap-year correction valid up to the year 2100.

Feature Summary

• Integrated 32,768Hz crystal in 16-pin SO package
• I2C interface supporting standard (100kHz) and fast mode (400kHz)
• Two programmable time-of-day alarms
• Automatic date adjustment for months with fewer than 31 days and leap years

Applications

• Handheld devices such as GPS units and POS terminals
• Consumer electronics including set-top boxes and digital recorders
• Office equipment like fax machines and printers
• Telecommunications infrastructure including routers and servers

Procurement Notes

Verify the RoHS compliance status associated with the '#' suffix, which indicates a lead-free/RoHS-compliant device potentially containing exempt lead. Confirm the specific tape-and-reel packaging quantity required for production integration. Ensure the ordering suffix matches the exact package dimensions and pin configuration specified in the manufacturer's documentation.

Selection Notes

Select this component when space constraints require an integrated oscillator solution within a 16-pin SO footprint. It is suitable for applications requiring dual interrupt capabilities via INTA and SQW/INTB pins. Verify that the system power supply remains above 1.8V for full I2C accessibility or utilizes battery backup below 1.8V for timekeeping maintenance.

Part Context

This part belongs to the DS1337 family of serial real-time clocks. The 'C' designation specifically identifies the variant with an integrated crystal, distinguishing it from the DS1337, DS1337S, and DS1337U which require external crystals. The '#T&R' suffix denotes the RoHS-compliant version supplied in a tape-and-reel format for automated assembly.

Replacement Considerations

Functionally equivalent parts include the DS1337S+ and DS1337U+, though these require external 32.768kHz crystals. The ISL12057 is noted as pin-compatible and functionally equivalent but lacks the integrated crystal feature.