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M48T59-70PC1 from ST,ST Microelectronics

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M48T59-70PC1

Manufacturer: ST

64 Kbit 8Kb x8 TIMEKEEPER SRAM

Partnumber Manufacturer Quantity Availability
M48T59-70PC1,M48T5970PC1 ST 140 In Stock

Description and Introduction

64 Kbit 8Kb x8 TIMEKEEPER SRAM The **M48T59-70PC1** is a Timekeeping RAM (TKRAM) manufactured by **STMicroelectronics**. Below are the factual details about this component:  

### **Specifications:**  
- **Type:** Non-volatile SRAM (NVSRAM) with real-time clock (RTC)  
- **Density:** 64 Kb (8 KB)  
- **Organization:** 8K x 8 bits  
- **Access Time:** 70 ns  
- **Supply Voltage:** 4.5V to 5.5V  
- **Operating Temperature Range:** 0°C to +70°C  
- **Package:** 28-pin DIP (Dual In-line Package)  
- **Battery Backup:** Built-in lithium energy source for data retention  
- **Data Retention:** Minimum 10 years in the absence of power  
- **Clock Accuracy:** ±1 minute per month at 25°C  

### **Descriptions:**  
- Combines SRAM with a real-time clock/calendar (RTC) in a single chip.  
- Non-volatile memory ensures data retention during power loss.  
- Includes a power-fail detection circuit for automatic switchover to battery backup.  
- Used in applications requiring timekeeping and data storage, such as industrial systems, embedded controllers, and networking equipment.  

### **Features:**  
- **Integrated RTC:** Provides seconds, minutes, hours, day, date, month, and year with leap-year compensation.  
- **Automatic Power-Fail Switchover:** Seamless transition to battery backup.  
- **Low Power Consumption:** Optimized for battery-backed applications.  
- **Industrial Standard Pinout:** Compatible with JEDEC-standard 8K SRAMs.  
- **Write Protection:** Prevents accidental writes to critical memory areas.  

This information is based on the manufacturer's datasheet and technical documentation.

Application Scenarios & Design Considerations

64 Kbit 8Kb x8 TIMEKEEPER SRAM

Alternative Part Number

  • DS1556-70 --: Pin-compatible timekeeper RAM with 64K x 8 nonvolatile memory and integrated battery, similar 70ns access time and 5V operation, direct functional replacement for the M48T59 timekeeper.
  • BQ4845S-70 --: Nonvolatile timekeeper SRAM with embedded battery and RTC, comparable 70ns speed and byte-wide interface, suitable drop-in alternative for timekeeping plus NV RAM applications.
  • DS1245Y-70 --: Nonvolatile SRAM module with 128K x 8 organization and 70ns access, offers similar battery-backed data retention and can replace the M48T59 in systems where the RTC function is handled separately.
  • DS1556-70+ --: Direct functional equivalent timekeeper RAM with integrated battery and RTC; same 70ns speed grade and 5V parallel interface, widely used as a drop-in replacement for the M48T59 family.
  • M48Z58Y-70PC1 --: ZEROPOWER SRAM from ST's M48Z series offering the same 8Kx8 organization, 70ns speed and battery-backed non-volatile operation as a same-vendor fallback.

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