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Microchip Technology 23K640T-I/SN

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

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Part No.:: 23K640T-I/SN

Manufacturer:: Microchip Technology

Category:: Memory

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: 23K640T-I/SN.pdf

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

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Product details

Overview

23K640T-I/SN 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 industrial temperature range (–40°C to +85°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 microcontroller-based data logging systems.

For engineers reviewing the 23K640T-I/SN datasheet, 23K640T-I/SN pinout, 23K640T-I/SN application, or 23K640T-I/SN equivalent, this page delivers verified electrical specs, SPI timing constraints, package-confirmed pin functions, real-world use cases in embedded telemetry and automotive control modules, and two validated alternative parts with documented functional and parametric differences.

Technical Context

The 23K640T-I/SN implements a standard 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 8-bit instruction register accepts READ (0x03), WRITE (0x02), RDSR (0x05), and WRSR (0x01) commands, all MSB-first, enabling byte/page/sequential access modes controlled via STATUS register bits 7–6.

It supports three configurable operating modes: Byte (default), Page (32-byte auto-increment within page), and Sequential (full 8192-byte wraparound). The HOLD pin suspends ongoing SPI transfers without resetting the address pointer, and its function is enabled/disabled via the STATUS register HOLD bit - critical for deterministic real-time interrupt handling in PIC® MCU systems.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Size	64 Kbit (8192 × 8-bit organization) - provides compact, non-volatile-like fast-access buffer for firmware variables or sensor history in space-constrained designs.
Interface	SPI-compatible serial bus (CS, SCK, SI, SO, HOLD) - eliminates parallel bus routing, reduces MCU pin count, and enables daisy-chaining with other SPI peripherals.
Max Clock Frequency	20 MHz at VCC = 3.0 V (I-temp) - enables 2.5 MB/s peak throughput for burst data capture in industrial controllers.
Supply Voltage	2.7–3.6 V - compatible with 3.3 V logic domains and tolerant of rail droop in battery-backed systems.
Standby Current	≤4 µA at +85°C - extends battery life in always-on telemetry nodes where SRAM retains state during sleep.
Page Size	32 bytes - balances write efficiency and granularity for firmware parameter updates without overwriting adjacent configuration blocks.
Data Retention Voltage	1.2 V minimum - ensures RAM contents survive brown-out events down to near-threshold supply levels.

Pinout & Package

23K640T-I/SN is packaged in an 8-lead SOIC (3.90 mm body), designated by suffix "SN", with Pb-free matte tin plating and RoHS/halogen-free compliance.

Pin/Terminal	Circuit Role	Design Meaning
CS	Chip Select Input	Active-low enable: drives device into active mode when low; forces SO to high-impedance and enters Standby when high - essential for multi-device SPI bus sharing.
SO	Serial Data Output	Tri-state output: shifts data out on falling edge of SCK; goes high-Z when CS is high or HOLD is asserted - prevents bus contention.
VSS	Ground	Reference return path for all digital I/O and internal circuitry - must be low-impedance and decoupled near VCC pin.
SI	Serial Data Input	Latches instructions, addresses, and write data on rising edge of SCK - requires clean signal integrity to avoid command corruption.
SCK	Serial Clock Input	Synchronizes all data transfers; rising edge clocks input, falling edge updates output - timing margins defined per VCC/temp in AC specs.
HOLD	Hold Input	Pauses ongoing SPI sequence when pulled low (with SCK low); resumes from same point when released - enables deterministic host interrupt servicing.
VCC	Supply Voltage	Primary power rail (2.7–3.6 V); powers core logic and I/O buffers - requires local 0.1 µF ceramic decoupling.

Key Features

Feature	Design Value
Flexible Access Modes	Configurable via STATUS register: Byte (single-location), Page (32-byte auto-increment within boundary), or Sequential (full-array wraparound) - optimizes bandwidth vs. address management overhead.
HOLD Functionality	Hardware-suspended SPI transfer with no address loss - eliminates retransmission overhead and guarantees deterministic latency for time-critical host interrupts.
Low-Power Operation	3 mA read current at 1 MHz / ≤4 µA standby at +85°C - enables continuous SRAM buffering in energy-harvesting or battery-powered edge sensors.
Industrial Temp Range	–40°C to +85°C operation - qualified for deployment in motor control enclosures, HVAC panels, and factory automation PLCs.
Pb-Free & RoHS Compliant	Matte tin (Sn) lead finish, halogen-free materials - meets global environmental compliance requirements for industrial and automotive end equipment.

Applications

Industrial Data Logger	Automotive Body Control Module
Use Scenario: Captures timestamped sensor readings (temperature, pressure, vibration) during machine downtime for later upload via CAN or cellular link. IC Role / Device Role / Timing Role: High-speed, low-power SRAM buffer that stores up to 8 KB of transient telemetry while MCU sleeps - accessed via SPI at 10–20 MHz bursts. Use Value: Eliminates need for external FRAM or EEPROM writes during logging, reducing wear and power spikes; HOLD allows MCU to service CAN interrupts without losing buffer state.	Use Scenario: Stores dynamic configuration (door lock states, mirror positions, lighting profiles) updated frequently during vehicle operation. IC Role / Device Role / Timing Role: SPI-connected volatile memory serving as fast-access parameter store for 8-bit/16-bit automotive MCUs - retains data across ignition cycles via backup supply. Use Value: Enables sub-millisecond read/write of user preferences without flash endurance limits; 1.2 V data retention voltage ensures state survival during cranking-induced brown-outs.
Medical Infusion Pump Controller	Smart Energy Meter
Use Scenario: Buffers real-time flow rate, motor position, and alarm history for diagnostic reporting and regulatory audit trails. IC Role / Device Role / Timing Role: Safety-relevant SRAM used for runtime variable storage and fault logging - accessed under IEC 62304-compliant deterministic timing. Use Value: HOLD pin guarantees atomic suspend/resume of log writes during priority therapy interrupts; industrial temp rating validates operation inside sealed pump housings.	Use Scenario: Holds cumulative kWh, tariff schedules, and communication stack buffers in utility-grade meters with 15+ year field life. IC Role / Device Role / Timing Role: Low-quiescent-current memory supporting meter MCU's deep-sleep cycles while preserving volatile session data between wake-ups. Use Value: 4 µA standby current at +85°C minimizes self-discharge of backup capacitors; SOIC-8 package enables automated optical inspection and high-yield reflow assembly.

Industrial Data Logger

Automotive Body Control Module

Use Scenario: Captures timestamped sensor readings (temperature, pressure, vibration) during machine downtime for later upload via CAN or cellular link.

IC Role / Device Role / Timing Role: High-speed, low-power SRAM buffer that stores up to 8 KB of transient telemetry while MCU sleeps - accessed via SPI at 10–20 MHz bursts.

Use Value: Eliminates need for external FRAM or EEPROM writes during logging, reducing wear and power spikes; HOLD allows MCU to service CAN interrupts without losing buffer state.

Use Scenario: Stores dynamic configuration (door lock states, mirror positions, lighting profiles) updated frequently during vehicle operation.

IC Role / Device Role / Timing Role: SPI-connected volatile memory serving as fast-access parameter store for 8-bit/16-bit automotive MCUs - retains data across ignition cycles via backup supply.

Use Value: Enables sub-millisecond read/write of user preferences without flash endurance limits; 1.2 V data retention voltage ensures state survival during cranking-induced brown-outs.

Medical Infusion Pump Controller

Smart Energy Meter

Use Scenario: Buffers real-time flow rate, motor position, and alarm history for diagnostic reporting and regulatory audit trails.

IC Role / Device Role / Timing Role: Safety-relevant SRAM used for runtime variable storage and fault logging - accessed under IEC 62304-compliant deterministic timing.

Use Value: HOLD pin guarantees atomic suspend/resume of log writes during priority therapy interrupts; industrial temp rating validates operation inside sealed pump housings.

Use Scenario: Holds cumulative kWh, tariff schedules, and communication stack buffers in utility-grade meters with 15+ year field life.

IC Role / Device Role / Timing Role: Low-quiescent-current memory supporting meter MCU's deep-sleep cycles while preserving volatile session data between wake-ups.

Use Value: 4 µA standby current at +85°C minimizes self-discharge of backup capacitors; SOIC-8 package enables automated optical inspection and high-yield reflow assembly.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
CY14V101QS-SZ25XI	128 Kbit density, 25 MHz max clock, 2.7–3.6 V, built-in NVSRAM with lithium battery backup - higher cost, larger footprint (16-pin SOIC).	Required where true non-volatility (no backup supply) is mandated for regulatory compliance or safety-critical data retention.	Select only if data persistence through complete power loss is required; otherwise 23K640T-I/SN offers lower BOM cost and simpler layout.
23LC1024-I/SN	1 Mbit density, identical 2.7–3.6 V supply and SOIC-8 package, but 20 MHz max clock and 5 mA read current - larger capacity, slightly higher power.	Suitable for applications needing >64 Kbit buffer (e.g., audio sample storage, extended firmware rollback tables).	Choose when memory expansion beyond 8 KB is needed without changing PCB footprint; verify MCU SPI driver can sustain 20 MHz reliably.

Compared with CY14V101QS-SZ25XI and 23LC1024-I/SN, the 23K640T-I/SN delivers optimal balance of density, speed, and ultra-low standby power in a minimal 8-pin SOIC - ideal for cost-sensitive, space-constrained industrial and automotive modules where external backup is acceptable.

Availability

23K640T-I/SN is available at Aetrix Electronics and suitable for industrial data loggers, automotive body control units, medical infusion pump controllers, and smart energy meters requiring stable component supply across long production lifecycles.

Supply support for 23K640T-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 devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 23K640T-I/SN belongs to Microchip's 23X640 SPI Serial SRAM product line, engineered specifically for low-power, high-reliability embedded systems requiring fast, flexible, and pin-efficient memory expansion without parallel bus overhead.

FAQ

What is the maximum clock frequency supported by the 23K640T-I/SN?

The 23K640T-I/SN supports up to 20 MHz clock frequency at VCC = 3.0 V and industrial temperature (–40°C to +85°C). At 1.5 V or automotive temperature, maximum frequency is reduced per AC specifications - always consult Table 1-2 in DS22126E for voltage- and temp-specific limits before final timing validation.

Does the 23K640T-I/SN retain data during power loss?

The 23K640T-I/SN retains data only while powered above its minimum retention voltage of 1.2 V. Below that threshold, RAM contents are lost. It is not non-volatile memory - persistent storage requires external backup (e.g., supercapacitor, coin cell) or pairing with EEPROM/FRAM for critical parameters.

How does the HOLD pin function in the 23K640T-I/SN?

The HOLD pin pauses ongoing SPI communication without resetting the internal address counter. To activate, HOLD must be pulled low while SCK is low; SO enters high-impedance, and inputs are ignored except CS. Resuming requires bringing HOLD high while SCK remains low - behavior confirmed in Figure 1-1 and Section 2.5 of DS22126E.

What package type does the 23K640T-I/SN use?

The 23K640T-I/SN uses an 8-lead plastic SOIC package with 3.90 mm body width (suffix "SN"), Pb-free matte tin plating, and RoHS/halogen-free compliance. Pinout matches standard SOIC-8 footprints and is identical to PDIP and TSSOP variants per Package Types table on DS22126E-page 2.

Can the 23K640T-I/SN operate in automotive temperature range?

No - the 23K640T-I/SN is rated for industrial temperature only (–40°C to +85°C). For automotive applications requiring –40°C to +125°C, Microchip specifies the 23K640-E/ST or 23K640-E/SN variants. Using the I-temp part outside its qualified range may result in timing violations or increased standby current.

23K640T-I/SN Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm 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 ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

23K640T-I/SN FAQ

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

Please submit a Request for Quotation (RFQ) for 23K640T-I/SN 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-I/SN reliable?

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

3.What payment methods are accepted for 23K640T-I/SN?

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

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 23K640T-I/SN?

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

Once your 23K640T-I/SN 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-I/SN?

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

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

All 23K640T-I/SN 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-I/SN meets industry standards.

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

All 23K640T-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 23K640T-I/SN, 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-I/SN part is unused and in its original packaging.

Return procedure for 23K640T-I/SN:

1.Submit a request within 90 days.

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

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