Microchip Technology 47C16-I/S16K

Overview

47C16-I/S16K from Microchip Technology is a 16 Kbit (2,048 × 8) I²C serial EERAM combining volatile SRAM with nonvolatile EEPROM backup. It operates at 4.5V–5.5V, supports up to 1 MHz I²C, and delivers automatic power-loss data retention via VCAP capacitor-assisted store/recall. It is used in industrial control modules where persistent memory state must survive unexpected power interruption.

For engineers reviewing the 47C16-I/S16K datasheet, 47C16-I/S16K pinout, 47C16-I/S16K application, or 47C16-I/S16K equivalent, key selection criteria include SRAM-EEPROM co-location, hardware/software store control, I²C timing compliance at 1 MHz, and AEC-Q100-qualified temperature range support for embedded systems requiring deterministic nonvolatile write behavior without external microcontroller intervention.

Technical Context

The 47C16-I/S16K implements a dual-memory architecture: a 2,048 × 8-bit SRAM array for high-speed read/write access and an integrated EEPROM array for nonvolatile backup. Store operations transfer SRAM contents to EEPROM either automatically on VCC fall below 4.0V (VTRIP), manually via HS pin pulse ≥150 ns, or through software command (0x55 + 0x33).

Recall restores EEPROM data to SRAM on power-up or via software (0x55 + 0xDD); both operations lock the I²C interface for up to 25 ms (store) or 5 ms (recall). The STATUS register (address 0x00) provides AM bit tracking, ASE-enabled auto-store control, BP<2:0> software write protection, and EVENT flag for HS-triggered detection.

Key Specifications

Pinout & Package

47C16-I/S16K is packaged in an 8-lead SOIC (Small Outline Integrated Circuit) with standard 1.27 mm pitch, RoHS-compliant, and rated for industrial temperature operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 47C16-I/S16K, 47L16-I/S16K offers voltage compatibility with modern low-power MCUs but requires redesign of power rail and VCAP network, while FM24V10-G trades deterministic store timing and hardware trigger capability for infinite write endurance and faster random writes - making it unfit for strict power-loss recovery workflows.

Availability

47C16-I/S16K is available at Aetrix Electronics and suitable for industrial PLCs, smart sensor nodes, motor drives, and energy meters requiring stable component supply with guaranteed long-term manufacturability and lifecycle continuity.

Supply support for 47C16-I/S16K 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

Microchip Technology is a global semiconductor company specializing in microcontrollers, analog, FPGA, and memory solutions, with strong focus on industrial, automotive, and aerospace reliability standards.

The 47C16-I/S16K belongs to Microchip's EERAM product line, designed specifically to replace battery-backed SRAM and simplify nonvolatile data retention in resource-constrained embedded systems without compromising on timing predictability or power-fail robustness.

FAQ

What is the function of the VCAP pin on the 47C16-I/S16K?

The VCAP pin on the 47C16-I/S16K connects to an external 5–6.8 µF capacitor that supplies hold-up energy during VCC collapse, enabling automatic SRAM-to-EEPROM store when VCC falls below 4.0–4.4V (VTRIP). If VCAP is left unconnected, Auto-Store must be disabled (ASE = 0) and VCAP tied to VCC to prevent EEPROM corruption during power loss.

How does the 47C16-I/S16K handle write protection of its SRAM array?

The 47C16-I/S16K uses three nonvolatile BP<2:0> bits in its STATUS register (0x00) to configure software write protection across 1/64 to full 2,048-byte SRAM array. Protection ranges are fixed per density - e.g., BP<2:0>=111 locks addresses 0x000–0x7FF. Write attempts to protected regions result in NACK and no data modification, preserving critical configuration data.

Can the 47C16-I/S16K operate on a 1 MHz I²C bus reliably?

Yes, the 47C16-I/S16K fully supports 1 MHz I²C operation per DS20005371E, with specified THIGH/TLOW ≥500 ns, rise/fall times ≤300 ns, and Schmitt-triggered SDA/SCL inputs. Its zero-cycle-delay reads/writes and 4 kV ESD protection ensure robust high-speed communication in electrically noisy industrial environments.

What happens to the 47C16-I/S16K during a Hardware Store operation?

During a Hardware Store operation triggered by an HS pin pulse ≥150 ns, the 47C16-I/S16K immediately suspends all I²C activity, transfers SRAM contents to EEPROM, and remains unresponsive for up to 25 ms. The AM bit clears upon completion, and the EVENT bit sets to indicate the HS-triggered event - all without requiring host software intervention.

Is the 47C16-I/S16K qualified for automotive applications?

The 47C16-I/S16K is AEC-Q100 qualified and rated for Industrial temperature (−40°C to +85°C), making it suitable for automotive-adjacent applications such as EV charging infrastructure, body control modules, and telematics gateways - though it is not marketed as a full automotive-grade part (Grade 1 or Grade 0). Its 200-year data retention and 1M store endurance meet stringent automotive reliability requirements.