Microchip Technology 23LC1024T-I/SNVAO

Overview

23LC1024T-I/SNVAO from Microchip Technology is a 1 Mbit (128K × 8) SPI serial SRAM with SDI and SQI interface support, operating at 2.5–5.5 V over –40°C to +85°C. It delivers 20 MHz clock rate in SPI/SDI/SQI modes, 3 mA read current at 5.5 V/20 MHz, and 4 µA standby current at +85°C. Used for real-time data buffering in industrial controllers interfacing PIC® or ARM-based MCUs via compact serial bus.

For engineers reviewing the 23LC1024T-I/SNVAO datasheet, 23LC1024T-I/SNVAO pinout, 23LC1024T-I/SNVAO application, or 23LC1024T-I/SNVAO equivalent, key selection criteria include voltage range compatibility (2.5–5.5 V), industrial temperature rating, quad/dual I/O mode enablement, page/sequential write flexibility, and SOIC-8 tape-and-reel packaging for automated assembly.

Technical Context

The 23LC1024T-I/SNVAO implements a serial SRAM architecture with three configurable access modes-Byte, Page (32-byte), and Sequential-controlled via an 8-bit MODE register. Its instruction set includes READ (0x03), WRITE (0x02), EDIO (0x3B), EQIO (0x38), and RSTIO (0xFF), enabling dynamic switching between SPI, SDI, and SQI protocols without reset.

It supports full-duplex SDI (2-bit/clock on SI/SO) and true quad-duplex SQI (4-bit/clock on SIO0–SIO3), with HOLD functionality active only in SPI/SDI modes. The device powers on in Standby mode (CS = high), requires CS low-to-high transition for initialization, and retains RAM data down to 1.0 V V_CC.

Key Specifications

Pinout & Package

8-lead SOIC package (3.90 mm body width), RoHS-compliant, tape-and-reel (VAO suffix indicates tape-and-reel packaging per Microchip's ordering system).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 23LC1024-I/SN, the 23LC1024T-I/SNVAO adds tape-and-reel packaging for production scalability; compared with IS66WV1M8ALL-150BLLI, it trades raw speed for interface simplicity, footprint reduction, and multi-mode flexibility in resource-constrained embedded systems.

Availability

23LC1024T-I/SNVAO is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and medical device manufacturing requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant SOIC packaging.

Supply support for 23LC1024T-I/SNVAO 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, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 23LC1024T-I/SNVAO belongs to Microchip's serial SRAM product line, engineered for low-pin-count, low-power, high-reliability data buffering in space- and power-constrained embedded systems where SPI bus efficiency and endurance matter more than parallel interface speed.

FAQ

What is the maximum clock frequency supported by the 23LC1024T-I/SNVAO in industrial temperature range?

The 23LC1024T-I/SNVAO supports up to 20 MHz clock frequency across its full industrial temperature range (–40°C to +85°C) in SPI, SDI, and SQI modes. This is confirmed in the Device Selection Table and AC Characteristics section of the official datasheet (DS20005142C). At extended temperature (–40°C to +125°C), the maximum clock rate reduces to 16 MHz. The 23LC1024T-I/SNVAO maintains full functionality-including page and sequential modes-at this rated speed.

Does the 23LC1024T-I/SNVAO support quad I/O (SQI) mode, and how is it enabled?

Yes, the 23LC1024T-I/SNVAO supports Serial Quad Interface (SQI) mode using pins SIO0–SIO3 for 4-bit-per-clock data transfer. SQI mode is enabled by issuing the EQIO command (0x38) via the SPI bus while the device is selected. Once activated, the HOLD pin becomes SIO3, and the device operates in true quad-duplex mode. To revert, the RSTIO command (0xFF) must be sent in SQI mode. This behavior is documented in Sections 4.2 and 4.3 of DS20005142C.

What is the purpose of the HOLD pin on the 23LC1024T-I/SNVAO, and does it function in all interface modes?

The HOLD pin (Pin 7) on the 23LC1024T-I/SNVAO suspends ongoing SPI or SDI transfers without resetting internal state-allowing MCU interrupts to execute before resuming. However, HOLD functionality is explicitly disabled in SQI mode, where Pin 7 serves as SIO3. The datasheet states: "Hold functionality is not available when operating in SQI bus mode" (Section 3.6). Therefore, HOLD is active only in SPI and SDI configurations, and must be held high when unused in those modes.

How does the 23LC1024T-I/SNVAO handle power loss, and what is its minimum data retention voltage?

The 23LC1024T-I/SNVAO guarantees RAM data retention down to 1.0 V V_CC, as specified in the Electrical Characteristics table (Parameter D011, VDR). This means that even during brown-out conditions or controlled power-down sequences where supply voltage drops below nominal levels, stored data remains intact until V_CC falls below 1.0 V. This parameter is critical for fail-safe logging and is validated per Microchip's testing protocol-not extrapolated or estimated.

Is the 23LC1024T-I/SNVAO pin-compatible with other members of the 23A1024/23LC1024 family, such as the 23A1024?

Yes, the 23LC1024T-I/SNVAO shares identical pinout, package (SOIC-8), and functional interface with the 23A1024 series. However, they differ in supply voltage range: 23LC1024T-I/SNVAO operates at 2.5–5.5 V, while 23A1024 variants require 1.7–2.2 V. Swapping them without adjusting V_CC will cause functional failure or damage. Both support SDI/SQI, but voltage incompatibility makes them electrically non-interchangeable despite mechanical and logical equivalence.