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Home > Products > Integrated Circuits (ICs) > Memory > Memory

Microchip Technology 23K640T-E/ST

Name: 23K640T-E/ST
Brand: Microchip Technology
SKU: 23K640T-E/ST
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 23K640T-E/ST

Manufacturer:: Microchip Technology

Category:: Memory

Package:: 8-TSSOP (0.173", 4.40mm Width)

Datasheet:: 23K640T-E/ST.pdf

Description:: IC SRAM 64KBIT SPI 20MHZ 8TSSOP

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Product details

Overview

23K640T-E/ST from Microchip Technology is a 64 Kbit (8192 × 8) low-power SPI Serial SRAM with 32-byte page architecture, 20 MHz max clock frequency, and automotive-grade temperature support (−40°C to +125°C). It operates from 2.7–3.6 V, draws only 3 mA at 1 MHz read current and ≤4 µA standby current at +85°C, and integrates HOLD functionality for interrupt-safe bus arbitration in embedded control systems.

For engineers reviewing the 23K640T-E/ST datasheet, 23K640T-E/ST pinout, 23K640T-E/ST application, or 23K640T-E/ST equivalent, key selection criteria include its TSSOP-8 automotive qualification, SPI-compatible serial interface with tri-state SO, 32-byte page write capability, and data retention down to 1.2 V - critical for battery-backed or low-voltage brownout resilience.

Technical Context

The 23K640T-E/ST implements a true SPI-compatible serial interface with separate SI (data in) and SO (data out) lines, requiring only CS, SCK, SI, SO, HOLD, VCC, and VSS. Its internal 16-bit address pointer supports byte, page (32-byte), and sequential read/write modes controlled via STATUS register bits 7–6.

Hold functionality is hardware- and software-gated: HOLD pin must be asserted while SCK is low, and the HOLD bit in STATUS register must be cleared to '0' for activation. The device powers up in standby mode (CS high), with SO in high-impedance state, enabling multi-drop SPI bus sharing.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Size	64 Kbit (8192 × 8-bit organization), providing compact nonvolatile-adjacent fast-access storage for firmware buffers or runtime variables.
Interface	SPI-compatible 4-wire serial bus (CS, SCK, SI, SO) - no I²C or parallel bus overhead; fully compatible with PIC® and other MCU SPI peripherals.
Max Clock Frequency	20 MHz at VCC = 3.0 V (I-temp) and 3.0 V (E-temp), enabling ~2.5 MB/s peak throughput in sequential mode.
Supply Voltage	2.7–3.6 V - matches standard 3.3 V system rails and supports automotive voltage transients per ISO 7637-2.
Standby Current	≤4 µA at +85°C - enables ultra-low-power sleep states in telematics or sensor nodes without external power gating.
Data Retention Voltage	1.2 V minimum - guarantees RAM contents survive deep brownout events down to single-cell LiFePO₄ or coin-cell backup levels.
Temperature Range	−40°C to +125°C (Automotive E-grade) - qualified for under-hood or ADAS domain controller deployment.

Pinout & Package

23K640T-E/ST is housed in an 8-lead TSSOP package (3.0 mm × 4.4 mm, 0.65 mm pitch), RoHS-compliant and halogen-free, optimized for automated SMT assembly and thermal performance in dense automotive PCB layouts.

Pin/Terminal	Circuit Role	Design Meaning
1 CS	Chip Select Input	Active-low enable: drives SO to high-impedance when high; required to initiate any operation; enables multi-device SPI sharing.
2 SO	Serial Data Output	Tri-state CMOS output: data shifted out MSB-first on falling edge of SCK; high-Z when CS high or HOLD active.
3 NC	No Connect	Internally unconnected pin - must remain floating or grounded per layout guidelines; no electrical function.
4 VSS	Ground	Primary reference for all digital and analog circuitry; requires low-inductance connection to system ground plane.
5 SI	Serial Data Input	CMOS input: latches instruction, address, and write data on rising edge of SCK; accepts SPI-mode-0 timing.
6 SCK	Serial Clock Input	Master-generated clock: synchronizes all SI sampling and SO updates; supports up to 20 MHz with <2 µs rise/fall times.
7 HOLD	Hold Input	Active-low pause control: suspends ongoing SPI transfer without reset; requires STATUS register HOLD bit = 0 to activate.
8 VCC	Supply Voltage	2.7–3.6 V power rail: must be decoupled with ≥100 nF ceramic capacitor near pin; supports data retention down to 1.2 V.

Key Features

Feature	Design Value
32-byte Page Write Mode	Enables burst writes within page boundaries without reissuing address; reduces SPI transaction count by up to 32× vs. byte mode.
HOLD Pin with Software Enable	Allows deterministic pause/resume of SPI transfers during host interrupt servicing - eliminates retransmission and improves real-time determinism.
Three Operating Modes (Byte/Page/Sequential)	Configurable via STATUS register bits 7–6: supports fine-grained access (byte), buffered block writes (page), or continuous streaming (sequential).
Low-Power Standby	Draws ≤4 µA at +85°C with CS high - suitable for always-on modules where memory must retain state between wake cycles.
Automotive Temperature Qualification	Rated −40°C to +125°C (E-grade) with full AC/DC specs guaranteed - meets AEC-Q100 stress test requirements for automotive electronics.

Applications

Infotainment Head Unit Memory Buffer	ADAS Camera Frame Buffer
Use Scenario: Temporary storage of decoded UI assets (icons, fonts, menus) during boot and dynamic theme switching. IC Role / Device Role / Timing Role: SPI-attached fast-access SRAM acting as L2 cache between application processor and display controller. Use Value: Eliminates NAND flash latency bottlenecks; enables sub-100 ms UI rendering startup using 20 MHz SPI burst reads.	Use Scenario: Storing one frame of raw image data from a 1.3 MP MIPI CSI-2 camera before compression or analysis. IC Role / Device Role / Timing Role: High-speed serial buffer interfacing with FPGA or SoC video pipeline via dedicated SPI port. Use Value: Provides 8 KB of deterministic-access memory with ≤50 ns output valid time - avoids FIFO overflow during variable exposure intervals.
Telematics Control Unit (TCU) Event Logger	Electric Power Steering (EPS) Fault History Storage
Use Scenario: Capturing CAN bus diagnostic snapshots (DTCs, timestamps, sensor values) during vehicle ignition cycles. IC Role / Device Role / Timing Role: Nonvolatile-adjacent volatile memory holding last 50–100 fault records with rapid overwrite capability. Use Value: Supports 32-byte page writes for atomic log entries; retains data down to 1.2 V during battery disconnect events.	Use Scenario: Recording torque sensor anomalies, motor current spikes, and steering angle deviations during EPS calibration or failure modes. IC Role / Device Role / Timing Role: Automotive-grade SRAM storing time-critical safety-critical event history with guaranteed E-grade reliability. Use Value: −40°C to +125°C operation ensures integrity across engine bay thermal cycling; HOLD pin enables safe logging during MCU interrupts.

Infotainment Head Unit Memory Buffer

ADAS Camera Frame Buffer

Use Scenario: Temporary storage of decoded UI assets (icons, fonts, menus) during boot and dynamic theme switching.

IC Role / Device Role / Timing Role: SPI-attached fast-access SRAM acting as L2 cache between application processor and display controller.

Use Value: Eliminates NAND flash latency bottlenecks; enables sub-100 ms UI rendering startup using 20 MHz SPI burst reads.

Use Scenario: Storing one frame of raw image data from a 1.3 MP MIPI CSI-2 camera before compression or analysis.

IC Role / Device Role / Timing Role: High-speed serial buffer interfacing with FPGA or SoC video pipeline via dedicated SPI port.

Use Value: Provides 8 KB of deterministic-access memory with ≤50 ns output valid time - avoids FIFO overflow during variable exposure intervals.

Telematics Control Unit (TCU) Event Logger

Electric Power Steering (EPS) Fault History Storage

Use Scenario: Capturing CAN bus diagnostic snapshots (DTCs, timestamps, sensor values) during vehicle ignition cycles.

IC Role / Device Role / Timing Role: Nonvolatile-adjacent volatile memory holding last 50–100 fault records with rapid overwrite capability.

Use Value: Supports 32-byte page writes for atomic log entries; retains data down to 1.2 V during battery disconnect events.

Use Scenario: Recording torque sensor anomalies, motor current spikes, and steering angle deviations during EPS calibration or failure modes.

IC Role / Device Role / Timing Role: Automotive-grade SRAM storing time-critical safety-critical event history with guaranteed E-grade reliability.

Use Value: −40°C to +125°C operation ensures integrity across engine bay thermal cycling; HOLD pin enables safe logging during MCU interrupts.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
CY14V104Q2L-BA25XIT	4 Mbit nvSRAM (nonvolatile + SRAM), 3.3 V, SOIC-28; includes automatic store/retrieve on power loss.	Replaces battery-backed SRAM in long-term event logging; adds EEPROM-like persistence without external capacitors.	Choose when data retention beyond power cycle is mandatory; avoid if only volatile buffering is needed and cost sensitivity is high.
IS66WV51216EBLL-100BLI	8 Mbit parallel SRAM, 3.3 V, TSSOP-48; 100 MHz async interface; no SPI or HOLD pin.	Used in legacy MCU designs with parallel bus; higher density but requires more PCB space and GPIOs.	Choose only if existing design uses parallel interface and board layout cannot accommodate serial topology change.

Compared with CY14V104Q2L-BA25XIT and IS66WV51216EBLL-100BLI, the 23K640T-E/ST delivers optimal balance of automotive qualification, SPI simplicity, low pin count, and ultra-low standby power - making it ideal for new designs prioritizing cost, footprint, and interrupt-safe serial buffering over nonvolatility or parallel bandwidth.

Availability

23K640T-E/ST is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera interfaces, telematics event logging, and electric power steering fault history storage requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 23K640T-E/ST 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 microcontroller, mixed-signal, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with high-reliability silicon and development tools.

The 23K640T-E/ST belongs to Microchip's 23X640 SPI Serial SRAM product line, designed specifically to replace parallel SRAM and battery-backed NVSRAM in space-constrained, low-power, and automotive-qualified embedded systems.

FAQ

What is the maximum clock frequency supported by the 23K640T-E/ST?

The 23K640T-E/ST supports a maximum clock frequency of 20 MHz when operating at VCC = 3.0 V over the automotive temperature range (−40°C to +125°C). This is confirmed in Table 1-2 of DS22126E, where FCLK = 20 MHz is specified for VCC = 3.0 V (E-Temp). At lower voltages or temperatures, the limit reduces - e.g., 16 MHz at 3.0 V (I-Temp) and 10 MHz at 1.5 V (I-Temp).

Does the 23K640T-E/ST require external pull-up resistors on its SPI lines?

The 23K640T-E/ST does not require external pull-ups on SI, SCK, or HOLD - these are CMOS inputs with standard logic thresholds. However, CS and SO lines benefit from weak pull-ups (e.g., 10 kΩ) in multi-drop configurations to ensure defined states during power-up or bus contention. SO is actively driven or tri-stated; no pull-up is mandatory but may improve noise immunity in noisy automotive environments.

How does the HOLD function interact with the STATUS register in the 23K640T-E/ST?

In the 23K640T-E/ST, the HOLD pin is hardware-enabled only when the HOLD bit (bit 0) in the STATUS register is cleared to '0'. If the STATUS register HOLD bit is set to '1', asserting the HOLD pin has no effect. This dual-gating prevents accidental suspension during initialization. The RDSR and WRSR instructions allow full read/write access to configure this behavior before enabling HOLD in live operation.

What is the meaning of "T" and "E/ST" in the part number 23K640T-E/ST?

In 23K640T-E/ST, "T" denotes tape-and-reel packaging (per Microchip's Product Identification System on page 25), "E" specifies the automotive temperature range (−40°C to +125°C), and "ST" identifies the 8-lead TSSOP package. This distinguishes it from tube-packaged variants (e.g., 23K640-E/ST without "T") and SOIC (SN) or PDIP (P) alternatives.

Can the 23K640T-E/ST be used in place of the 23A640 series?

No - the 23K640T-E/ST is not a drop-in replacement for the 23A640 series. They differ in supply voltage (2.7–3.6 V vs. 1.5–1.95 V), temperature grading (E-grade vs. I-grade only), and internal DC characteristics. Interchanging them risks overvoltage damage to 23A640 or insufficient drive strength from 23K640T-E/ST in 1.8 V systems. Always verify VCC compatibility and temp-range alignment before substitution.

23K640T-E/ST Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 8-TSSOP (0.173", 4.40mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: Not Verified

Memory Type:: Volatile

Memory Format:: SRAM

Technology:: SRAM

Memory Size:: 64Kbit

Memory Organization:: 8K x 8

Memory Interface:: SPI

Clock Frequency:: 20 MHz

Write Cycle Time - Word, Page:: -

Access Time:: -

Voltage - Supply:: 2.7V ~ 3.6V

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-TSSOP

23K640T-E/ST FAQ

1.How can I place an order for 23K640T-E/ST through Aetrix?

Please submit a Request for Quotation (RFQ) for 23K640T-E/ST on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for 23K640T-E/ST reliable?

The price and inventory of 23K640T-E/ST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 23K640T-E/ST is usually 5 days.

3.What payment methods are accepted for 23K640T-E/ST?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 23K640T-E/ST transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 23K640T-E/ST?

23K640T-E/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 23K640T-E/ST order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for 23K640T-E/ST?

For technical support, including 23K640T-E/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 23K640T-E/ST requirements.

6.How does Aetrix verify that 23K640T-E/ST is sourced from the original manufacturer or authorized distributors?

All 23K640T-E/ST products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 23K640T-E/ST meets industry standards.

7.What is the process for return or replacement of 23K640T-E/ST?

All 23K640T-E/ST units undergo pre-shipment inspection (PSI). If there is an issue with 23K640T-E/ST, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The 23K640T-E/ST part is unused and in its original packaging.

Return procedure for 23K640T-E/ST:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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