My Inquiry
My Account
Microchip Technology 23K640-E/ST
- Part No.:
- 23K640-E/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
23K640-E/ST.pdf
- Description:
- IC SRAM 64KBIT SPI 20MHZ 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,850
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
23K640-E/ST from Microchip Technology is a 64 Kbit (8192 × 8) SPI serial SRAM with 32-byte page architecture, 3.6 V max supply, automotive-grade temperature range (−40°C to +125°C), and HOLD pin for interrupt-safe bus suspension - used in engine control units, ADAS sensor buffers, and automotive infotainment memory expansion.
For engineers reviewing the 23K640-E/ST datasheet, 23K640-E/ST pinout, 23K640-E/ST application, or 23K640-E/ST equivalent, key selection criteria include SPI-compatible timing at up to 20 MHz, standby current ≤4 µA at +85°C, 8-lead TSSOP package compatibility, and automotive AEC-Q100 alignment via extended temperature operation.
Technical Context
The 23K640-E/ST implements a true SPI interface with separate SI/SO lines, supports byte/page/sequential read/write modes via STATUS register configuration, and uses rising-edge sampling on SI and falling-edge output on SO synchronized to SCK. Its HOLD pin enables deterministic pause/resume of ongoing transfers without command retransmission.
It operates across VCC = 2.7–3.6 V, features data retention down to 1.2 V, and maintains full AC timing compliance (e.g., tCSS ≤25 ns, tCLD ≤25 ns) at 3.0 V over −40°C to +125°C - validated per Automotive (E) grade specifications in DS22126E.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 64 Kbit (8192 × 8-bit organization), enabling compact buffer storage for real-time sensor or CAN message queues. |
| Interface | SPI-compatible 4-wire serial bus (CS, SCK, SI, SO), eliminating parallel bus routing and reducing MCU pin count. |
| Max Clock Frequency | 20 MHz at VCC = 3.0 V and TA = −40°C to +125°C, supporting high-throughput logging in automotive black-box recorders. |
| Standby Current | ≤4 µA maximum at +85°C, meeting low-power requirements for always-on vehicle subsystems. |
| Page Size | 32-byte page write capability, optimizing burst writes for firmware update staging or parameter block storage. |
| Operating Voltage | 2.7–3.6 V supply range, compatible with 3.3 V automotive power domains and tolerant of rail droop during cranking. |
| Temperature Range | −40°C to +125°C (Automotive E-grade), qualified for under-hood and transmission-control module deployment. |
Pinout & Package
23K640-E/ST is housed in an 8-lead TSSOP (Thin Shrink Small Outline Package) with 0.65 mm lead pitch, JEDEC MO-153 compliant, and Pb-free/RoHS/halogen-free construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select Input | Active-low enable; places device in Standby (SO tri-stated) when high, required to initiate any SPI transaction. |
| SO | Serial Data Output | CMOS-compatible output; drives data on falling edge of SCK, supports multi-drop SPI bus sharing. |
| VSS | Ground Reference | Primary return path for all internal logic and I/O; must be low-impedance connection to system GND plane. |
| SI | Serial Data Input | CMOS input; latches instruction/address/data on rising edge of SCK; requires clean signal integrity per SPI spec. |
| SCK | Serial Clock Input | Master-generated clock; defines timing for SI sampling and SO updates; max 20 MHz frequency supported. |
| HOLD | Hold Input | Active-low pause control; suspends ongoing SPI transfer without resetting address pointer; requires STATUS bit enable. |
| VCC | Supply Voltage | 2.7–3.6 V power input; decoupling capacitor (0.1 µF ceramic) required within 5 mm of VCC/VSS pins. |
Key Features
| Feature | Design Value |
|---|---|
| 32-byte Page Write Mode | Enables efficient burst writes within page boundaries, reducing transaction overhead vs. byte-by-byte writes. |
| HOLD Pin with Resume Capability | Allows host MCU to service higher-priority interrupts mid-transfer and resume from exact point - no reinitialization needed. |
| Automotive Temperature Grade (E) | Validated operation from −40°C to +125°C, supporting placement in engine bay, transmission, or brake control modules. |
| Data Retention at 1.2 V | Maintains RAM contents during brown-out or battery disconnect events down to 1.2 V supply, preserving critical state. |
| Pb-Free / RoHS / Halogen-Free | Complies with automotive environmental standards (e.g., ELV, JIG-106), enabling use in Tier-1 production programs. |
Applications
| Engine Control Unit (ECU) Data Logging | ADAS Camera Frame Buffer |
|---|---|
|
Use Scenario: Capturing transient sensor data (MAP, knock, O2) during fault conditions for post-diagnostic analysis. IC Role / Device Role / Timing Role: High-speed, non-volatile buffer interfacing directly with PIC MCU SPI port; replaces slower EEPROM for rapid capture. Use Value: 20 MHz clock support enables 2.5 MB/s effective write throughput; 32-byte page mode reduces SPI overhead by 75% vs. byte writes. |
Use Scenario: Temporary frame storage between image sensor capture and DSP processing in lane-departure warning systems. IC Role / Device Role / Timing Role: Low-latency serial SRAM acting as ping-pong buffer; accessed via DMA-driven SPI controller. Use Value: ≤4 µA standby current extends sleep-mode battery life; HOLD pin ensures zero-frame-loss during CPU interrupt servicing. |
| Automotive Infotainment UI State Cache | Telematics Module Event Queue |
|
Use Scenario: Storing user interface context (menu depth, volume setting, Bluetooth pairing state) across power cycles. IC Role / Device Role / Timing Role: Fast-access memory holding volatile UI metadata; retains data during ignition-off periods via backup supply. Use Value: 1.2 V data retention voltage allows operation during 12 V rail collapse; TSSOP package enables compact layout near SoC. |
Use Scenario: Queuing GPS position fixes, cellular handshakes, and diagnostic trouble codes before cloud upload. IC Role / Device Role / Timing Role: SPI-connected circular buffer managing asynchronous event ingestion from multiple sources. Use Value: Sequential read/write mode enables continuous streaming without address wrap management; automotive temp grade ensures reliability in trunk-mounted units. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY14V104Q2L-BAI | 4 Mbit nvSRAM with integrated lithium battery backup; 3.3 V only; no HOLD pin; SOIC-28 package. | Used where persistent storage without external backup circuitry is required; unsuitable for space-constrained TSSOP layouts. | Select when data retention during complete power loss is mandatory - not for temporary buffering only. |
| FM25V05-G | 512 Kbit F-RAM with SPI interface; 2.7–3.6 V; 40 MHz max clock; no page limits; SOIC-8 package. | Preferred for high-endurance write-intensive logging (e.g., odometer, DTC counters); higher cost per bit. | Choose when >10¹⁴ write cycles or instant-write capability eliminates wear leveling complexity. |
Compared with CY14V104Q2L-BAI and FM25V05-G, the 23K640-E/ST delivers optimal balance of automotive qualification, low standby power, compact TSSOP footprint, and cost-effective 64 Kbit capacity for transient buffer applications - without over-engineering for persistence or endurance.
Availability
23K640-E/ST is available at Aetrix Electronics and suitable for automotive ECU development, ADAS sensor integration, and telematics module production requiring stable component supply across extended temperature and long lifecycle commitments.
Supply support for 23K640-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 23K640-E/ST belongs to Microchip's 23X640 SPI Serial SRAM product line, designed specifically for automotive and industrial applications demanding robust serial memory with low-power operation and extended temperature performance.
FAQ
What is the maximum clock frequency supported by the 23K640-E/ST across its full automotive temperature range?
The 23K640-E/ST supports up to 20 MHz clock frequency at VCC = 3.0 V and TA = −40°C to +125°C, as specified in Table 1-2 of DS22126E. This timing is fully characterized and guaranteed for automotive (E-grade) operation - unlike lower-voltage variants that limit to 16 MHz at 3.0 V.
Does the 23K640-E/ST require external pull-up resistors on its SPI interface lines?
No, the 23K640-E/ST does not require external pull-ups on CS, SI, SCK, or HOLD - all inputs have internal weak pull-downs (per DC characteristics table). SO is actively driven and tri-states when CS is high; external pull-up on SO is unnecessary unless shared with other open-drain devices.
How does the HOLD function interact with the STATUS register in the 23K640-E/ST?
The HOLD function in the 23K640-E/ST is disabled unless bit 0 (HOLD) of the STATUS register is cleared to '0'. The 23K640-E/ST powers up with this bit set to '1', so a WRSR command must first clear it before pulling HOLD low will suspend SPI communication.
What is the data retention capability of the 23K640-E/ST when VCC drops below operating voltage?
The 23K640-E/ST guarantees data retention down to VCC = 1.2 V (parameter D011, VDR), meaning RAM contents remain valid during brown-out or battery sag events - critical for automotive systems where 12 V rail may dip to ~6 V but backup supplies hold above 1.2 V.
Is the 23K640-E/ST pin-compatible with other members of the 23X640 family such as the 23A640?
Yes, the 23K640-E/ST shares identical 8-lead TSSOP pinout and SPI protocol with all 23X640 variants including 23A640, but differs in VCC range (2.7–3.6 V vs. 1.5–1.95 V) and temperature grade (E vs. I). Electrical interface behavior is consistent; only supply and thermal validation differ.
23K640-E/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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
23K640-E/ST FAQ
1.How can I place an order for 23K640-E/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 23K640-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 23K640-E/ST reliable?
The price and inventory of 23K640-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 23K640-E/ST is usually 5 days.
3.What payment methods are accepted for 23K640-E/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 23K640-E/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 23K640-E/ST?
23K640-E/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 23K640-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 23K640-E/ST?
For technical support, including 23K640-E/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 23K640-E/ST requirements.
6.How does Aetrix verify that 23K640-E/ST is sourced from the original manufacturer or authorized distributors?
All 23K640-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 23K640-E/ST meets industry standards.
7.What is the process for return or replacement of 23K640-E/ST?
All 23K640-E/ST units undergo pre-shipment inspection (PSI). If there is an issue with 23K640-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 23K640-E/ST part is unused and in its original packaging.
Return procedure for 23K640-E/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
23K640-E/ST Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
