A compact 28-DIP non-volatile RAM with integrated real-time clock, crystal oscillator, and lithium battery backup—offering seamless timekeeping and data retention.
The STMicroelectronics M48T08‑150PC1 is a highly integrated Timekeeper® module that combines 8 kB (8 K × 8) SRAM with a precision real-time clock (RTC), all within a single 28-pin DIP package. This module merges memory, a quartz crystal, and a long-life lithium button cell in the CAPHAT™ housing for reliable, uninterrupted data storage and timekeeping—even during power loss. Setting itself apart, this module supports byte-wide RAM-like clock access, and includes automatic power-fail control to protect data integrity with automatic deselection during voltage drops. The real-time clock operates with BCD-coded timekeeping (year, month, day, date, hours, minutes, seconds) and maintains accuracy to within approximately ±1 minute per month at 25 °C, ensuring precise timing functions. It is electrically and functionally compatible with the DS1643, fits standard JEDEC 8 K × 8 SRAM sockets, and requires no special write-timing or wear limitations. The integrated crystal and battery make it ideal for applications where both memory retention and timekeeping continuity are critical.
Key Features
Integrated Timekeeper® module with 8 kB non-volatile SRAM and RTC
28-pin DIP (PCDIP-28) “CAPHAT™” package, housing crystal and lithium battery
JEDEC-compliant SRAM footprint, compatible with DS1643 and standard sockets
Byte-wide RAM-like clock access for easy interfacing
Automatic power-fail deselect & write protection for data safety
BCD time format: year, month, day, date, hours, minutes, seconds
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