M48T559YMH1TR STMicroelectronics Integrated Circuit (Small Outline Packages) In Stock
M48T559YMH1TR is a 512 Kbit (64 K x 8) TIMEKEEPER SRAM from STMicroelectronics with an integrated real-time clock, watchdog timer, and on-chip lithium cell, housed in a 28-pin SO package. It operates from 4.5 V to 5.5 V and retains data for up to 10 years, ideal for industrial controllers and telecommunications equipment requiring non-volatile timekeeping memory.
- Manufacturer
- STMicroelectronics
- Package
- Small Outline Packages
- Pin Count
- 28
- Lifecycle
- OBSOLETE
- Datasheet
- M48T559YMH1TR Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 512 Kbit (64 K x 8) battery-backed SRAM with integrated lithium cell
- On-chip real-time clock with century register and leap-year compensation
- Watchdog timer with selectable timeout periods
- Data retention up to 10 years from integrated lithium source
- Operating supply 4.5 V to 5.5 V with 70 ns access time
- 28-pin SO package for drop-in compatibility with standard SRAM
Applications
The M48T559YMH1TR is used in industrial programmable logic controllers, telecom switching equipment, and network routers that require both fast SRAM access and reliable non-volatile timekeeping without external batteries. Its integrated 10-year lithium cell eliminates the need for external backup circuitry, simplifying board design and improving long-term reliability in harsh environments. It also suits legacy military and aerospace systems where discrete battery management is impractical.
Specifications
| Pbfree Code | No |
| YTEOL | 0 |
| Memory IC Type | STANDARD SRAM |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.32.00.41 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How long does the M48T559YMH1TR retain data after main power is removed?
The M48T559YMH1TR retains all 512 Kbit (64 K x 8) of SRAM data and the real-time clock state for up to 10 years using its on-chip lithium cell, eliminating the need for an external backup battery and simplifying board design in industrial control systems.
What is the access time of M48T559YMH1TR and how does it compare to standard SRAM for CPU-direct interfacing?
M48T559YMH1TR provides a 70 ns SRAM access time with a 4.5 V to 5.5 V operating supply, making it pin-compatible and performance-competitive with standard 64 Kx8 SRAM devices while adding non-volatile timekeeping and watchdog functions in the same 28-pin SO footprint.
Which industries rely on M48T559YMH1TR for time-stamped data logging and control?
Telecommunications switching equipment, industrial PLC systems, and network infrastructure devices rely on M48T559YMH1TR because it combines 64 K x 8 fast SRAM with an integrated real-time clock accurate to ±1 ppm and a watchdog timer, providing all timekeeping and memory functions in a single 28-pin package.
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About STMicroelectronics
STMicroelectronics is a global semiconductor leader serving customers across the spectrum of electronics applications. ST's products are found in a wide range of applications including automotive, industrial, personal electronics, and communications.
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