M48T59Y-70MH1E

Real Time Clock Overview

The M48T59Y-70MH1E is a non-volatile real-time clock and static RAM integrated circuit manufactured by STMicroelectronics. It combines an 8 Kbit (8 Kbit x 8) SRAM array with a quartz-controlled real-time clock in a single package. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports parallel interface communication. It features automatic power-fail detection, write protection, and battery backup switching to maintain data integrity during power loss. The component utilizes a 28-lead Small Outline package (SOH28) designed for surface mount assembly, requiring a separate SNAPHAT housing for the integrated lithium battery and crystal.

Real Time Clock Feature Summary

• Integrated 8 Kbit SRAM and Real-Time Clock with BCD-coded time/date registers
• Automatic power-fail deselect and write protection when VCC falls below threshold
• Battery backup switchover maintains clock and data retention for at least 7 years
• Programmable alarm output and watchdog timer active in battery backup mode

Real Time Clock Applications

• Embedded systems requiring precise timekeeping and non-volatile data storage
• Industrial control units needing reliable clock functions under varying power conditions
• Telecommunications equipment utilizing battery-backed memory solutions

Real Time Clock Procurement Notes

Verify component status as obsolete or not recommended for new designs. Confirm availability through authorized distributors. Ensure compatibility with required SNAPHAT battery housing part numbers such as M4T28-BR12SH1 or M4T32-BR12SHx for proper operation. Check RoHS compliance documentation for lead-free second level interconnect specifications.

Real Time Clock Selection Notes

Select this model for applications requiring a 5V parallel interface RTC with integrated memory. The 'Y' suffix indicates a 4.5V to 5.5V operating voltage range. The 'MH1E' suffix denotes the 28-SOH package with SNAPHAT socket. Ensure system design accommodates the separate mounting of the SNAPHAT housing after reflow soldering to protect the internal battery from high temperatures.

Real Time Clock Part Context

This component belongs to the TIMEKEEPER® M48T59 series, which offers pin-compatible variants including the standard M48T59 (5V) and M48T59V (3.3V). The M48T59Y variant specifically targets 5V systems with a slightly lower power-fail deselect voltage window compared to the standard M48T59. It serves as a drop-in replacement for standard JEDEC 8Kb x 8 SRAMs while providing additional clock functionality.

Real Time Clock Replacement Considerations

Direct functional substitutes include the M48T59Y-70MH1F (tape and reel packaging) or the M48T59-70PC1 (DIP package). For 3.3V applications, consider the M48T59V series. Verify that any replacement maintains the same 28-pin SOH footprint and SNAPHAT compatibility if surface mount integration is required.