Texas Instruments BQ4016YMC-70

Overview

BQ4016YMC-70 from Texas Instruments is a nonvolatile 1,048,576 × 8-bit SRAM with integrated lithium backup, 70 ns access time, -10% VCC supply tolerance (VPFD = 4.37 V), and 10-year data retention without power. It operates as standard SRAM during normal operation and automatically switches to battery-backed mode during power failure-used in industrial control memory logging and embedded system configuration storage.

For engineers reviewing the BQ4016YMC-70 datasheet, BQ4016YMC-70 pinout, BQ4016YMC-70 application, or BQ4016YMC-70 equivalent, key selection criteria include VPFD threshold compatibility with ±10% supply systems, write-protection timing (tWPT = 100 µs typical), tCER = 120 ms recovery window, and MC-module 36-pin DIP mechanical fit for legacy board layouts.

Technical Context

The BQ4016YMC-70 integrates CMOS SRAM with on-die power-fail detection circuitry that triggers at VPFD = 4.37 V (typical), enabling automatic write-protection and lithium cell activation before VCC drops below 3 V. Its control logic ensures uninterrupted data preservation across power transitions without external components.

It supports conventional asynchronous SRAM timing with CE/OE/WE controls, delivers 70 ns read cycle time (tRC), and maintains high-impedance I/O states during power-down. The internal lithium cell remains electrically isolated until first VCC application, limiting self-discharge to ~0.5% per year prior to activation.

Key Specifications

Pinout & Package

Package: 36-pin plastic dual-in-line module (MC-type), 0.600-inch width, through-hole mounting compatible with legacy PCB footprints.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar nonvolatile SRAM applications.

Compared with STK15C88-70, BQ4016YMC-70 eliminates external backup components and provides longer data retention; versus BQ4015YMC-70, it doubles memory capacity while preserving identical timing, VPFD, and reliability characteristics for seamless scalability.

Availability

BQ4016YMC-70 is available at Aetrix Electronics and suitable for industrial control configuration storage, medical device calibration data retention, and telecom real-time logging requiring stable component supply across extended product lifecycles.

Supply support for BQ4016YMC-70 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

Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.

The BQ4016YMC-70 belongs to TI's Benchmarq nonvolatile SRAM product line, engineered specifically for mission-critical data retention in systems subject to frequent or unpredictable power interruptions.

FAQ

What is the VPFD threshold voltage for BQ4016YMC-70, and how does it differ from the standard BQ4016MC-70?

The BQ4016YMC-70 has a VPFD threshold of 4.37 V (typical), optimized for systems with ±10% 5 V supply tolerance. In contrast, the BQ4016MC-70 uses 4.62 V (typical) for ±5% tolerance. This difference ensures reliable write-protection triggering across wider input voltage variations without requiring external adjustment-critical for industrial power supplies with looser regulation.

Does BQ4016YMC-70 require external components to achieve nonvolatility?

No, the BQ4016YMC-70 requires zero external components for nonvolatile operation. Its integrated lithium coin cell, precision voltage monitor, and automatic switchover circuitry eliminate the need for backup capacitors, diodes, or discrete power-fail detectors-reducing BOM count, PCB area, and qualification effort compared to capacitor-based NVSRAM alternatives.

How long does the internal lithium cell retain data in BQ4016YMC-70 after power removal?

The BQ4016YMC-70 guarantees ≥10 years of data retention without external power, measured from the time VCC is first applied. The lithium cell remains electrically isolated until that initial power-on event, limiting pre-activation self-discharge to approximately 0.5% per year-ensuring shelf life exceeds 15 years before deployment.

What happens to BQ4016YMC-70 outputs during power-down?

When VCC falls below the VPFD threshold, the BQ4016YMC-70 immediately places all DQ0–DQ7 outputs into high-impedance state and treats all inputs as "don't care." This prevents bus contention and unintended writes during brownout, while the internal lithium supply sustains memory contents until VCC returns above VPFD + tCER (120 ms).

Is BQ4016YMC-70 pin-compatible with other members of the bq4016 family?

Yes, the BQ4016YMC-70 shares identical 36-pin MC-module pinout and signal definitions with BQ4016MC-70 and BQ4015YMC-70. Address, data, and control pins (A0–A19, DQ0–DQ7, CE/OE/WE, VCC/VSS) map one-to-one-enabling direct substitution in existing layouts where supply tolerance or memory depth requirements change.