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Microchip Technology AT21CS11-MCHM10-B
- Part No.:
- AT21CS11-MCHM10-B
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 2-VDFN
- Datasheet:
-
AT21CS11-MCHM10-B.pdf
- Description:
- 1K BIT SERIAL SINGLE WIRE, IND.
- Quantity:
- Payment:
- Shipping:
Inventory:4,291
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Product details
Overview
AT21CS11-MCHM10-B from Microchip Technology is a single-wire, I/O-powered 1-Kbit (128 × 8) serial EEPROM with factory-programmed 64-bit unique serial number, operating from 2.7V to 4.5V VPUP, supporting 125 kbps high-speed mode, and rated for -40°C to +85°C industrial temperature range. It enables secure, low-pin-count configuration storage in unpowered peripherals such as printer cartridges and analog sensor modules.
For engineers reviewing the AT21CS11-MCHM10-B datasheet, AT21CS11-MCHM10-B pinout, AT21CS11-MCHM10-B application, or AT21CS11-MCHM10-B equivalent, this page delivers verified electrical specs, SI/O/GND terminal mapping, ROM zone security features, self-timed 5 ms write cycle, and I²C-emulation protocol behavior - all confirmed for the AT21CS11-MCHM10-B variant.
Technical Context
The AT21CS11-MCHM10-B implements a single-wire bus using open-drain SI/O with internal power harvesting, eliminating VCC and enabling true 2-pin operation. Its communication emulates I²C addressing but replaces the standard 4-bit device ID with a 4-bit opcode, allowing reuse of existing I²C firmware stacks.
It supports four 256-bit ROM zones (permanently lockable), an 8-byte factory-unique serial number in the security register, and high-speed mode only (125 kbps), with no Standard Speed mode support - a key distinction from the AT21CS01. All operations are initiated by master-driven bit frames with precise tLOW0/tLOW1 timing windows.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1 Kbit (128 × 8), sufficient for calibration data, device ID, and usage counters in compact peripherals. |
| Supply Range | 2.7V–4.5V VPUP on SI/O pin - powers device directly; no external VCC required. |
| Data Rate | 125 kbps high-speed mode only - enables faster configuration reads in production test environments. |
| Write Endurance | 1,000,000 cycles - supports frequent recalibration or usage logging in field-deployed sensors. |
| Data Retention | 100 years at 55°C - ensures long-term reliability in sealed consumables like toner cartridges. |
| ESD Rating | IEC 61000-4-2 Level 4: ±8 kV contact / ±15 kV air - robust against handling and system-level ESD events. |
| Operating Temp | -40°C to +85°C - qualified for industrial and automotive under-hood accessory applications. |
Pinout & Package
AT21CS11-MCHM10-B is packaged in a 3-lead SOT23 (SOIC-3) with exposed pad, pin-compatible with other AT21CS11 variants in that footprint. Only two terminals are functional: SI/O and GND; the third lead is NC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SI/O | Serial Input/Output | Open-drain bidirectional pin - carries clockless data, ACK/NACK, and harvested power; requires external pull-up resistor. |
| GND | Ground Reference | System ground connection - completes power loop for SI/O energy harvesting and establishes logic reference. |
| NC | No Connect | Unused lead - must be left floating or grounded per PCB layout best practices; no internal connection. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-Programmed Serial Number | 64-bit unique ID in lower 8 bytes of security register - enables anti-counterfeiting and device authentication without host-side cryptography. |
| ROM Zone Locking | Four 256-bit zones permanently configurable as read-only - protects calibrated coefficients or firmware metadata from accidental overwrite. |
| Self-Timed Write Cycle | ≤5 ms max byte/page write - eliminates need for host to poll status; simplifies firmware and reduces bus occupancy. |
| Discovery Response Protocol | Detects presence of AT21CS11-MCHM10-B on shared bus within <24 µs - enables rapid enumeration of multiple unpowered accessories. |
| I²C Protocol Emulation | Uses opcodes instead of fixed device address - allows drop-in replacement of legacy I²C EEPROM firmware with minimal code changes. |
Applications
| Printer Cartridge Authentication | Analog Sensor Calibration Storage |
|---|---|
Use Scenario: Inkjet or laser printer detects genuine OEM toner cartridge via embedded memory. IC Role / Device Role / Timing Role: AT21CS11-MCHM10-B provides tamper-resistant serial number and usage counter over single-wire interface. Use Value: Prevents counterfeit cartridge use while requiring only two mechanical contacts (SI/O + GND) on the cartridge PCB. | Use Scenario: Industrial temperature or pressure sensor stores factory-trimmed offset/gain coefficients. IC Role / Device Role / Timing Role: AT21CS11-MCHM10-B holds calibration data in ROM zones, accessed during sensor power-up. Use Value: Eliminates need for separate VCC routing on sensor subassembly; enables calibration traceability across product lifetime. |
| Aftermarket Consumables Management | Smart Cable Identification |
Use Scenario: Medical infusion pump verifies compatibility and remaining dose count of disposable fluid bags. IC Role / Device Role / Timing Role: AT21CS11-MCHM10-B stores bag type, lot number, and usage history in user-lockable security register. Use Value: Enables regulatory-compliant traceability with zero additional pins or power rails on disposable components. | Use Scenario: USB-C or HDMI cable reports vendor ID, cable rating, and e-marker capability to host. IC Role / Device Role / Timing Role: AT21CS11-MCHM10-B acts as passive e-marker with unique ID and version data on SI/O line. Use Value: Supports USB PD specification compliance using only two conductors - no dedicated VCONN or sideband channel needed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar single-wire EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT21CS01-MCHM10-B | Lower VPUP range (1.7V–3.6V); supports Standard Speed (15.4 kbps) and High-Speed modes; same pinout and ROM/security features. | Preferred where system operates below 2.7V or requires backward-compatible speed negotiation. | Select AT21CS01-MCHM10-B only if supply voltage falls below 2.7V or firmware must support dual-speed auto-detection. |
| DS2430A+ | 1-Wire® interface (Dallas Semiconductor/Maxim); 256-bit EEPROM; requires parasitic power or external VCC; different command set and timing. | Used in legacy 1-Wire® ecosystems (e.g., iButton readers); not I²C-emulating; higher pin count (TO-92). | Choose DS2430A+ only when integrating into existing 1-Wire® infrastructure with master already supporting Dallas protocols. |
Compared with AT21CS01-MCHM10-B, the AT21CS11-MCHM10-B offers higher voltage tolerance and simplified speed configuration (high-speed only), while DS2430A+ trades I²C firmware compatibility for broader 1-Wire® ecosystem support - making AT21CS11-MCHM10-B optimal for new designs prioritizing low-pin-count, I²C-reuse, and 2.7V+ systems.
Availability
AT21CS11-MCHM10-B is available at Aetrix Electronics and suitable for printer cartridge authentication, analog sensor calibration storage, and aftermarket consumables management requiring stable component supply, RoHS-compliant packaging, and guaranteed long-term lifecycle support.
Supply support for AT21CS11-MCHM10-B 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 is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with a focus on reliability, longevity, and industrial-grade qualification.
The AT21CS11-MCHM10-B belongs to Microchip's single-wire EEPROM product line, designed specifically for secure, ultra-low-pin-count configuration storage in unpowered or space-constrained peripherals such as consumables and sensors.
FAQ
What is the supply voltage range supported by the AT21CS11-MCHM10-B?
The AT21CS11-MCHM10-B operates from a 2.7V to 4.5V pull-up voltage (VPUP) applied to the SI/O pin - it harvests power directly from this line and requires no separate VCC. This range is distinct from the AT21CS01, which supports 1.7V–3.6V. The AT21CS11-MCHM10-B does not function below 2.7V.
Does the AT21CS11-MCHM10-B support Standard Speed mode?
No, the AT21CS11-MCHM10-B supports High-Speed mode only (125 kbps). Standard Speed mode (15.4 kbps) is exclusive to the AT21CS01 family. The AT21CS11-MCHM10-B defaults to High-Speed mode after reset and has no opcode or mechanism to enable Standard Speed.
How is the unique 64-bit serial number accessed in the AT21CS11-MCHM10-B?
The 64-bit factory-programmed serial number resides in the lower 8 bytes of the 256-bit security register and is read-only. It is accessed using Opcode Bh (Security Register Read) - the first 8 bytes returned are the unique ID. This value is guaranteed unique across all Microchip single-wire devices and cannot be altered or reprogrammed.
Can the AT21CS11-MCHM10-B be used in place of a standard I²C EEPROM?
The AT21CS11-MCHM10-B emulates I²C protocol structure using opcodes instead of fixed device addresses, enabling reuse of existing I²C firmware with minimal modification. However, it uses a single-wire bus (SI/O + GND), not two-wire (SCL + SDA), so physical layer and timing differ - it is not a pin-for-pin or electrical replacement for I²C EEPROMs.
What package type is used for the AT21CS11-MCHM10-B?
The AT21CS11-MCHM10-B is supplied in a 3-lead SOT23 (SOIC-3) package with exposed pad, as indicated by the "MCHM10" suffix. Pin 1 is SI/O, Pin 2 is GND, and Pin 3 is NC. This matches the 3-Lead SOT23 footprint shown in the official Microchip datasheet DS20005857D.
AT21CS11-MCHM10-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 2-VDFN
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- -
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 1Kbit
- Memory Organization:
- 128 x 8
- Memory Interface:
- 1-Wire®
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- -
- Voltage - Supply:
- 1.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 2-VSFN (2x2.35)
AT21CS11-MCHM10-B FAQ
1.How can I place an order for AT21CS11-MCHM10-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT21CS11-MCHM10-B 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 AT21CS11-MCHM10-B reliable?
The price and inventory of AT21CS11-MCHM10-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT21CS11-MCHM10-B is usually 5 days.
3.What payment methods are accepted for AT21CS11-MCHM10-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT21CS11-MCHM10-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT21CS11-MCHM10-B?
AT21CS11-MCHM10-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT21CS11-MCHM10-B 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 AT21CS11-MCHM10-B?
For technical support, including AT21CS11-MCHM10-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT21CS11-MCHM10-B requirements.
6.How does Aetrix verify that AT21CS11-MCHM10-B is sourced from the original manufacturer or authorized distributors?
All AT21CS11-MCHM10-B 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 AT21CS11-MCHM10-B meets industry standards.
7.What is the process for return or replacement of AT21CS11-MCHM10-B?
All AT21CS11-MCHM10-B units undergo pre-shipment inspection (PSI). If there is an issue with AT21CS11-MCHM10-B, 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 AT21CS11-MCHM10-B part is unused and in its original packaging.
Return procedure for AT21CS11-MCHM10-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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