Microchip Technology 23AA04M-I/P

Overview

23AA04M-I/P 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, and supports byte/page/sequential read/write with user-selectable 32- or 256-byte page size. It is used in industrial data logging systems requiring fast, low-voltage, nonvolatile-capable memory with pin-efficient serial expansion.

For engineers reviewing the 23AA04M-I/P datasheet, 23AA04M-I/P pinout, 23AA04M-I/P application, or 23AA04M-I/P equivalent, key selection considerations include its 8-lead PDIP package, absence of VBAT backup support, SPI mode default on power-up, and distinction from the 14-lead 23LCV04M which includes battery backup and different voltage range.

Technical Context

The 23AA04M-I/P implements a quad-capable serial interface supporting SPI (mode 0/3), SDI, and SQI protocols - with automatic protocol detection via command instructions (EDIO/EQIO/RSTIO). Its internal architecture includes an ECC engine that latches correction status in the STATUS register's ECS bit and retains configuration across power cycles via nonvolatile register settings.

It uses a 24-bit address space (512 KB total) mapped to 256 × 8-bit organization, with page size configurable via STATUS register bit 8. The HOLD/SIO3 pin functions as a pause control in SPI/SDI modes but becomes an active I/O in SQI mode, and all I/O pins support programmable drive strength (8 levels) and slew rate (4 settings).

Key Specifications

Pinout & Package

23AA04M-I/P is supplied in an 8-lead PDIP package (0.300" wide), pin-compatible with SOIC and TSSOP variants. All 8 leads are functional; no NC pins. Pin 1 is CS, pin 8 is VCC, and VBAT is not present - confirming absence of battery backup capability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 23AA04M-I/P, the 23LCV04M-I/P adds battery backup but requires 14-pin layout and higher minimum voltage, while the IS61WV25616BLL-10MLI offers faster random access but sacrifices serial simplicity, ECC, and voltage flexibility - making 23AA04M-I/P optimal for new compact, low-power, protocol-adaptable designs.

Availability

23AA04M-I/P is available at Aetrix Electronics and suitable for industrial data loggers, medical sensor hubs, smart meter firmware caches, and PLC I/O expansion modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for 23AA04M-I/P 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 components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 23AA04M belongs to Microchip's serial SRAM product line, designed specifically for embedded systems needing high-speed, low-voltage, pin-efficient memory expansion with protocol flexibility and industrial-grade reliability.

FAQ

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

The 23AA04M-I/P supports up to 40 MHz in standard SPI mode (0x03 READ instruction), 80 MHz equivalent in SDI mode, and 143 MHz in SQI mode (0x0B High-Speed Read instruction). These frequencies are validated across the full industrial temperature range (-40°C to +85°C) and require adherence to AC timing parameters including TCSS, TSU, and THD as specified in Table 1-3 of the datasheet. The 143 MHz rating applies only to SQI mode with proper signal integrity controls.

Does the 23AA04M-I/P support battery backup for data retention during power loss?

No, the 23AA04M-I/P does not support battery backup. It lacks the VBAT pin and associated switchover circuitry found in the 23LCV04M variant. Data retention relies solely on maintaining VCC above 1.0V (per parameter D011), with standby current of 140 µA typical at 25°C. For applications requiring external battery hold-up, the 23LCV04M-I/P - which includes VBAT, automatic switchover at 1.75–1.95V, and data retention down to 1.4V - is the appropriate alternative.

How is the page size configured on the 23AA04M-I/P, and what are the implications for write operations?

The page size on the 23AA04M-I/P is set via bit 8 of the STATUS register: '0' selects 32-byte pages, '1' selects 256-byte pages. This setting determines the boundary for automatic address wrap during page-mode writes. Using 32-byte pages minimizes write latency for small data packets, while 256-byte pages maximize throughput for bulk transfers. Page-mode writes are limited to the selected page; crossing the boundary wraps to the start of the same page - not the next - unless sequential mode is enabled.

What role does the HOLD pin play in the 23AA04M-I/P, and how does it behave across interface modes?

The HOLD/SIO3 pin on the 23AA04M-I/P functions exclusively as a hold control in SPI and SDI modes - pausing ongoing transfers without resetting internal state, allowing the host to service interrupts. In SQI mode, it becomes an active I/O pin (SIO3) and cannot be used for hold. Hold activation requires CS low and a falling edge coinciding with SCK low; exit occurs on rising edge coinciding with SCK low. SO tri-states immediately on HOLD assertion, independent of SCK state.

Is the 23AA04M-I/P pin-compatible with other members of the 23XX04M family, such as the 23LCV04M?

No, the 23AA04M-I/P is not pin-compatible with the 23LCV04M. The 23AA04M-I/P uses an 8-lead PDIP package with pins CS, SO/SIO1, SIO2, VSS, SI/SIO0, SCK, HOLD/SIO3, and VCC. The 23LCV04M uses a 14-lead package with additional VBAT and NC pins, and reassigns pin positions (e.g., VCC is on pin 14, not pin 8). The datasheet explicitly states "23AA04M is only available in 8-lead while 23LCV04M is only available in 14-lead," confirming physical and electrical incompatibility.