STMicroelectronics M48Z02-70PC1

Overview

M48Z02-70PC1 from STMicroelectronics is a 16 kbit (2 Kb × 8) non-volatile ZEROPOWER® SRAM with integrated lithium battery, CAPHAT™ DIP package, 70 ns access time, and automatic power-fail write protection. It functions as a drop-in replacement for JEDEC-standard 2 K × 8 SRAMs (e.g., DS1220) in real-time clock backup, configuration storage, and firmware parameter retention applications.

For engineers reviewing the M48Z02-70PC1 datasheet, M48Z02-70PC1 pinout, M48Z02-70PC1 application, or M48Z02-70PC1 equivalent, this page delivers verified timing specs, battery-backed retention behavior, VPFD voltage thresholds, pin-level control logic, and functional alternatives for legacy system upgrades requiring guaranteed 10-year data retention without external backup circuitry.

Technical Context

The M48Z02-70PC1 integrates a 2 K × 8 static RAM array, ultra-low-power voltage-sensing circuitry, and a sealed lithium button cell within a 24-pin PDIP CAPHAT™ package. Its power-fail detection triggers write protection when VCC falls between 4.5 V and 4.75 V (VPFD window), then seamlessly switches to battery backup at ≤3.0 V (VSO).

It supports standard TTL/CMOS-compatible control signals (E, G, W) with ripple-through read access, identical read/write cycle times (70 ns), and automatic high-impedance output disable during power transition. The BOK (Battery OK) flag enables runtime battery health verification via software-read complement check sequence.

Key Specifications

Pinout & Package

24-pin plastic DIP (PDIP24.7) with integrated CAPHAT™ battery housing; 600 mil width, 0.3 inch lead pitch, RoHS-compliant lead-free second-level interconnect.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar non-volatile SRAM applications.

Compared with DS1225Y-150+, M48Z02-70PC1 reduces system-level validation effort by integrating VPFD logic and battery health monitoring; compared with M48Z12-70PC1, it offers higher VPFD threshold for improved noise immunity in stable +5 V environments.

Availability

M48Z02-70PC1 is available at Aetrix Electronics and suitable for real-time clock backup, firmware configuration storage, industrial PLC parameter retention, and legacy system ROM replacement requiring stable component supply across extended product lifecycles.

Supply support for M48Z02-70PC1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power ICs, sensors, and memory solutions for industrial, automotive, and consumer markets.

The M48Z02 belongs to ST's ZEROPOWER® SRAM product line, engineered specifically for mission-critical data retention in systems where external backup power infrastructure is impractical or cost-prohibitive.

FAQ

What is the expected battery lifetime under continuous backup operation?

The integrated lithium carbon monofluoride (LiCFx) battery in the CAPHAT™ package guarantees ≥10 years of data retention at 0–70 °C ambient temperature with no power applied. This rating reflects accumulated backup time, not calendar life, and assumes proper decoupling and absence of negative VCC transients below –0.3 V.

How does the BOK (Battery OK) flag operate during power-up?

At power-up, the BOK flag indicates battery health: if set, the first attempted WRITE is blocked and the system must execute a complement-read sequence (per Figure 7) to clear it. The flag is automatically reset after successful first write, restoring normal operation - no external reset signal required.

Can M48Z02-70PC1 be used in place of a standard 2 K × 8 SRAM without design changes?

Yes - it is pin- and function-compatible with JEDEC-standard 2 K × 8 SRAMs like the DS1220. No timing or logic interface modifications are needed; however, ensure VCC decoupling includes a 0.1 µF ceramic capacitor and consider adding a Schottky diode (e.g., 1N5817) from VCC to VSS to suppress negative transients.

What happens if VCC falls rapidly through the VPFD window?

If VCC fall time from VPFD(max) to VPFD(min) is less than 300 µs (tF), write protection may delay up to 200 µs after crossing VPFD(min), risking corruption at the currently addressed location. Systems must limit VCC slew rate or add hold-up capacitance to meet tF specification.