M48T58-70PC1

Real Time Clock Overview

The M48T58-70PC1 is a Real-Time Clock (RTC) and non-volatile static RAM integrated circuit manufactured by STMicroelectronics. It features an 8.19 kB memory capacity organized as 8K x 8 bits, with a maximum access time of 70 ns. The device operates within a supply voltage range of 4.75 V to 5.5 V and supports parallel interface communication. Designed for industrial applications, it functions reliably between 0°C and +70°C. The component is housed in a 28-pin PCDIP package, providing through-hole mounting capabilities for system integration.

Real Time Clock Feature Summary

• Integrated Real-Time Clock with BCD-coded date and time registers
• 8.19 kB Non-Volatile SRAM with 70 ns access speed
• Parallel interface compatible with JEDEC standard 8K x 8 SRAMs
• Automatic power-fail chip deselect and write protection

Real Time Clock Applications

• Industrial control systems requiring persistent timekeeping
• Data logging equipment needing battery-backed memory
• Telecommunications infrastructure maintaining synchronization
• Embedded systems with parallel bus architectures

Real Time Clock Procurement Notes

Verify the specific voltage threshold requirements against the datasheet, as the M48T58 variant specifies a minimum operating voltage of 4.75 V, distinct from the 4.5 V rating found in related models like the M48T58Y. Confirm package authenticity and lead-free compliance status prior to integration into production assemblies.

Real Time Clock Selection Notes

Select this component when a parallel interface is required for direct SRAM-like access combined with RTC functionality. Ensure the design accommodates the 28-pin PCDIP footprint and that the system power supply remains stable above 4.75 V to maintain proper operation and write protection thresholds during power transitions.

Real Time Clock Part Context

This part belongs to the M48T58 series of TIMEKEEPER® SRAM devices. It serves as a pin-and-function equivalent to standard JEDEC 8K x 8 SRAMs while adding real-time clock capabilities. The series includes variants such as the M48T58Y, which differs primarily in its lower minimum supply voltage specification.

Real Time Clock Replacement Considerations

The M48T58Y-70PC1 is a functional substitute but operates at a lower minimum voltage (4.5 V vs 4.75 V). Verify that the system voltage does not drop below 4.75 V if retaining the original M48T58-70PC1, or confirm compatibility if switching to the Y variant.