Microchip Technology 47L04-I/SN

Overview

47L04-I/SN from Microchip Technology is a 4 Kbit I²C serial EERAM combining 512 × 8-bit SRAM with integrated EEPROM backup, operating at 2.7–3.6 V and supporting up to 1 MHz I²C clock. It enables automatic power-loss data retention via VCAP capacitor-assisted store/recall, features hardware Store (HS) pin and software-controlled commands, and targets industrial embedded systems requiring nonvolatile memory with infinite SRAM write endurance.

For engineers reviewing the 47L04-I/SN datasheet, 47L04-I/SN pinout, 47L04-I/SN application, or 47L04-I/SN equivalent, this device serves as a drop-in upgrade path from legacy I²C EEPROMs or battery-backed SRAMs-offering zero-cycle-delay reads/writes, configurable software write protection, and deterministic 8 ms store time without external supervision logic.

Technical Context

The 47L04-I/SN implements a dual-memory architecture where SRAM provides high-speed volatile access while EEPROM preserves data across power cycles. Its I²C interface complies with standard 100 kHz/400 kHz/1 MHz modes, uses Schmitt-trigger inputs for noise immunity, and supports cascading up to four devices on one bus via A1/A2 address pins.

Store and recall operations are managed through three independent mechanisms: automatic execution upon VCC fall below VTRIP (2.4–2.6 V), manual triggering via HS pin pulse (≥150 ns), or software command (0x55 + 0x33 for Store, 0x55 + 0xDD for Recall). The STATUS register (address 0x00) exposes AM, ASE, BP<2:0>, and EVENT bits for real-time state monitoring and configuration.

Key Specifications

Pinout & Package

47L04-I/SN is housed in an 8-lead SOIC package (SN suffix), with 1.27 mm pitch and JEDEC MS-012AC footprint. Pin functions are electrically validated per DS20005371E and support direct PCB replacement of industry-standard 8-pin I²C memory devices.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 47L04-I/P, the 47L04-I/SN offers identical functionality in a space-saving SOIC package ideal for high-density layouts; compared with AT24C04C-SSHM-T, it delivers true EERAM behavior-enabling both high-speed SRAM operation and fail-safe EEPROM backup without software overhead or external components.

Availability

47L04-I/SN is available at Aetrix Electronics and suitable for smart energy meters, programmable logic controllers, and medical infusion pumps requiring stable component supply across extended product lifecycles.

Supply support for 47L04-I/SN 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 Inc. is a leading provider of microcontrollers, analog, FPGA, and memory solutions, serving industrial, automotive, and communications markets with vertically integrated silicon and development tools.

The 47L04-I/SN belongs to Microchip's EERAM product line, designed specifically to replace battery-backed SRAM and legacy EEPROM in systems demanding both speed and nonvolatility - bridging the gap between volatile performance and persistent data integrity.

FAQ

What is the function of the VCAP pin on the 47L04-I/SN?

The VCAP pin on the 47L04-I/SN connects to an external 5–6.8 µF capacitor that supplies hold-up energy during VCC collapse, enabling automatic SRAM-to-EEPROM store when voltage drops below 2.4–2.6 V. If VCAP is tied directly to VCC, Auto-Store must be disabled (ASE = 0) to prevent EEPROM corruption during power loss - a requirement explicitly stated in DS20005371E.

How does the 47L04-I/SN handle write protection?

The 47L04-I/SN implements software-configurable write protection via BP<2:0> bits in its STATUS register (address 0x00), allowing protection of 1/64 to the full 512-byte SRAM array. Protection is nonvolatile and persists across power cycles. Attempts to write to protected regions result in NACK after the data byte, halting the operation without incrementing the address pointer - behavior confirmed in Table 2-1 of DS20005371E.

Can the 47L04-I/SN operate at 1 MHz I²C speed across its full temperature range?

Yes, the 47L04-I/SN supports 1 MHz I²C operation from −40°C to +85°C (Industrial grade), as specified in the Device Selection Table and verified in Table 1-2 AC Characteristics. Minimum clock high/low times are 500 ns, and rise/fall times are limited to 300 ns - all met under worst-case VCC = 2.7 V and TA = +85°C conditions per DS20005371E.

What is the maximum number of devices that can be cascaded on a single I²C bus using the 47L04-I/SN?

Up to four 47L04-I/SN devices can be cascaded on a single I²C bus using the A1 and A2 address pins, which configure the two least-significant bits of the 7-bit client address (1010A2A10). This yields four unique addresses: 0xA0, 0xA2, 0xA4, and 0xA6 - a capability explicitly documented in the Features section and Figure 2-3 of DS20005371E.

Does the 47L04-I/SN require external pull-up resistors on SDA and SCL lines?

Yes, the 47L04-I/SN requires external pull-up resistors on both SDA and SCL lines because its I²C interface uses open-drain outputs. Recommended values range from 2.2 kΩ to 10 kΩ depending on bus capacitance and speed; DS20005371E specifies maximum bus capacitance as 400 pF and confirms Schmitt-trigger inputs for noise suppression - confirming standard I²C bus topology compliance.