DS17285E-5

Real Time Clock Overview

The DS17285E-5 is a real-time clock (RTC) integrated circuit designed as a successor to the industry-standard DS12885. It provides timekeeping for seconds, minutes, hours, day, date, month, and year with leap year compensation through 2099. The device operates at +5.0V and features a multiplexed parallel interface. It includes one time-of-day alarm, three maskable interrupts, a programmable square wave output, and 114 bytes of battery-backed NV SRAM. The component is housed in a 28-pin TSOP package and supports operation within a commercial temperature range of 0°C to +70°C.

Real Time Clock Feature Summary

• Multiplexed parallel interface compatible with standard PC clock architectures
• Real-time clock/calendar with automatic leap year compensation through 2099
• 114 bytes of general-purpose battery-backed non-volatile SRAM
• Integrated power-fail detect and switch circuitry for seamless backup power transition

Real Time Clock Applications

• Personal computer systems requiring precise timekeeping
• Industrial control systems needing reliable calendar functions
• Data logging equipment requiring timestamping capabilities

Real Time Clock Procurement Notes

Verify the specific suffix 'E' indicates the TSOP package variant and '-5' denotes the +5.0V operating voltage. Confirm availability status as this component may be subject to discontinuation or limited stock depending on the manufacturer's lifecycle management. Ensure compatibility with existing board layouts designed for 28-pin TSOP footprints.

Real Time Clock Selection Notes

Select the DS17285E-5 when a +5.0V supply is required rather than the +3.0V variant. This model offers 114 bytes of NV SRAM; choose higher-capacity models like the DS17885 if larger memory storage is needed. Verify that the system design supports multiplexed parallel addressing and data buses. Check if industrial temperature ranges are necessary, as this part is specified for commercial temperatures.

Real Time Clock Part Context

The DS17285 belongs to the DS17x85 family, which serves as an enhanced replacement for the legacy DS12885 series. The 'E' suffix identifies the Thin Shrink Small Outline Package (TSOP), while the '5' specifies the +5V power supply requirement. This family integrates silicon serial numbers and SMI recovery stacks not present in earlier generations.

Real Time Clock Replacement Considerations

The DS17285S-5+ is a pin-compatible alternative in an SOIC-28 package. For systems requiring more NV SRAM, the DS17885E-5+ provides 8KB of storage. Direct replacements must maintain the multiplexed parallel interface and +5V operation.