Microchip Technology 23AA04M-I/SN

Overview

23AA04M-I/SN from Microchip Technology is a 4,096-Kbit serial SRAM with SPI/SDI/SQI interface, operating from 1.7V to 3.6V across -40°C to +85°C. It delivers 143 MHz max clock frequency in SQI mode, features built-in ECC logic for data integrity, and supports byte/page/sequential read/write with user-selectable 32- or 256-byte page size. It is used in industrial embedded systems requiring fast, low-voltage, nonvolatile-capable memory with pin-efficient serial bus access.

For engineers reviewing the 23AA04M-I/SN datasheet, 23AA04M-I/SN pinout, 23AA04M-I/SN application, or 23AA04M-I/SN equivalent, key selection considerations include its 8-lead SOIC/TSSOP/PDIP package, absence of VBAT backup support (distinguishing it from 23LCV04M), SPI mode default on power-up, and dual/quad I/O configurability via EDIO/EQIO commands - all critical for timing-critical, space-constrained, or battery-free industrial control designs.

Technical Context

The 23AA04M-I/SN implements a serial SRAM architecture with three configurable bus modes: SPI (separate SI/SO), SDI (2-wire multiplexed SIO[1:0]), and SQI (4-wire multiplexed SIO[3:0]). It defaults to SPI mode at power-on reset and supports both mode 0 and mode 3 clock polarity/idle states.

Its internal STATUS register controls page size (32/256 bytes), output drive strength (8 levels), slew rate (4 settings), and latches ECC correction status per read operation. The HOLD/SIO3 pin enables pause/resume of ongoing transfers without resetting the command sequence - essential for interrupt-driven host systems.

Key Specifications

Pinout & Package

23AA04M-I/SN is available exclusively in 8-lead packages: SOIC (SN), TSSOP (ST), and PDIP (P). Pin functions are identical across all 8-lead variants.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 23LCV04M-I/SN and IS61WV51216BLL-10MLI, the 23AA04M-I/SN uniquely balances ultra-low-voltage operation (1.7V), 8-lead serial footprint, and 143 MHz SQI bandwidth - making it optimal for new designs prioritizing pin count, power, and speed over battery backup or parallel bus compatibility.

Availability

23AA04M-I/SN is available at Aetrix Electronics and suitable for industrial data loggers, medical sensor hubs, programmable logic controller I/O modules, and smart energy meter firmware caches requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 23AA04M-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 global semiconductor company specializing in microcontrollers, analog devices, and memory solutions for industrial, automotive, and consumer applications.

The 23AA04M belongs to Microchip's serial SRAM product line, designed specifically for space-constrained, low-power embedded systems needing reliable, high-speed serial memory without external battery support.

FAQ

Does the 23AA04M-I/SN support battery backup operation?

No, the 23AA04M-I/SN does not support external battery backup. It lacks the VBAT pin present on the 23LCV04M variant. Data retention relies solely on maintaining VCC above 1.0 V. For applications requiring nonvolatile retention during main power loss, the 23LCV04M-I/SN is the appropriate alternative, though it uses a 14-lead package and is not pin-compatible with the 23AA04M-I/SN.

What is the maximum clock frequency supported by the 23AA04M-I/SN in each interface mode?

The 23AA04M-I/SN supports up to 40 MHz for standard READ (0x03) in all modes. For HIGH-SPEED READ (0x0B), it supports up to 143 MHz in SQI mode, 143 MHz in SDI mode, and 40 MHz in SPI mode. The 143 MHz rating applies only to the 0x0B instruction and requires proper signal integrity design, including controlled impedance traces and minimized stub lengths.

How does the HOLD function operate on the 23AA04M-I/SN, and what are its timing requirements?

The HOLD function on the 23AA04M-I/SN pauses ongoing serial transfers without resetting internal state. Hold activation requires CS low and a falling edge on HOLD coinciding with SCK low; exit requires a rising edge on HOLD coinciding with SCK low. Setup/hold times are 1.4 ns minimum. During Hold, SO immediately enters high-impedance, enabling the host to service interrupts without data corruption or reinitialization.

Can the 23AA04M-I/SN be used in place of a parallel SRAM like the IS61WV51216BLL-10MLI?

No, the 23AA04M-I/SN cannot directly replace parallel SRAMs such as the IS61WV51216BLL-10MLI. It uses a serial SPI/SDI/SQI interface with command-based addressing, whereas the IS61WV51216BLL-10MLI uses asynchronous parallel addressing and data buses. Migration requires firmware changes to implement serial protocol handling and address translation, plus PCB redesign to accommodate the 8-lead SOIC footprint versus 44-pin TSOP.

What page sizes are supported by the 23AA04M-I/SN, and how is the selection made?

The 23AA04M-I/SN supports two page sizes: 32 bytes and 256 bytes. Selection is controlled by bit 8 (PAGE SIZE) in the STATUS register: '0' selects 32-byte pages (16,384 pages total), and '1' selects 256-byte pages (2,048 pages total). This setting persists across power cycles and is configured via the WRSR (Write Status Register) command, allowing runtime optimization for small configuration writes versus large firmware updates.