DS17487-5IND+

Real Time Clock Overview

The DS17487-5IND+ is a real-time clock (RTC) module designed as a successor to the industry-standard DS12887. It integrates a quartz crystal and lithium energy source within a 24-pin encapsulated DIP (EDIP) package, eliminating the need for external components. The device provides timekeeping with leap-year compensation through 2099 and supports both 12-hour and 24-hour formats. It features a multiplexed byte-wide interface for system access. Electrical specifications include a VCC supply range of 4.5V to 5.5V and a standby current of 1.0mA to 3.0mA at 5V operation. The module includes 4096 bytes of battery-backed NV SRAM and a 64-bit silicon serial number.

Real Time Clock Feature Summary

• Integrated EDIP Package: Combines RTC, 32.768kHz crystal, and lithium battery in a single 24-pin DIP form factor.
• Extended Memory: Provides 4096 bytes of battery-backed nonvolatile RAM alongside standard user registers.
• Power Control Circuitry: Supports system power-on via date/time alarm or kickstart input using the PWR output pin.
• Enhanced Accuracy: Factory trimmed to ±1 minute per month accuracy at 25°C with automatic leap-year correction.

Real Time Clock Applications

• Embedded Systems
• Utility Meters
• Security Systems
• Network Hubs, Bridges, and Routers

Real Time Clock Procurement Notes

Verify the specific suffix IND+ indicates industrial temperature range (-40°C to +85°C) and lead-free compliance. Confirm the -5 suffix denotes the 5V operating voltage variant. Check for RoHS status and UL recognition details in the official datasheet before integration.

Real Time Clock Selection Notes

Select this model when an integrated solution without external crystals or batteries is required. Ensure the system design accommodates the multiplexed address/data bus interface. Verify that the 5V VCC requirement aligns with the host processor logic levels and that the EDIP package fits the PCB layout constraints.

Real Time Clock Part Context

This component belongs to the DS17x87 family, which are standalone RTC modules. Unlike the DS17x85 series, these devices do not require external VBAT connections for primary timekeeping as the energy source is embedded. They serve as direct replacements for legacy DS12887 designs while offering enhanced memory and power management features.

Real Time Clock Replacement Considerations

Public confirmed substitute part numbers include DS17287-5IND+ and DS17887-5IND+. These variants share the same package and interface but differ in extended RAM capacity (2KB and 8KB respectively). Verify compatibility if memory size changes affect the application software.

Real Time Clock FAQ

How does the DS17487-5IND+ handle power failure?

A precision temperature-compensated circuit monitors VCC. If primary power fails, the device automatically switches to the internal lithium backup supply to maintain time and data retention.

What is the function of the PWR pin?

The PWR pin is an active-low open-drain output used to control system power. It can trigger power-on events based on a wake-up alarm or kickstart input.

Is the DS17487-5IND+ Y2K compliant?

Yes, the device includes a century register and automatic leap-year compensation valid up to the year 2099, ensuring Y2K compliance.