My Inquiry
My Account
Microchip Technology AT93C66-10TI-1.8
- Part No.:
- AT93C66-10TI-1.8
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT93C66-10TI-1.8.pdf
- Description:
- IC EEPROM 4KBIT 3-WIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,003
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT93C66-10TI-1.8 from Microchip Technology (formerly Atmel) is a 4-kbit serial EEPROM with three-wire interface, supporting 1.8V to 5.5V operation and user-selectable 512 × 8 or 256 × 16 organization via the ORG pin. It delivers 2 MHz clock rate at 5V, 10 ms max self-timed write cycle, 1 million write endurance, and 100-year data retention - deployed in automotive instrument clusters, industrial sensor calibration storage, and embedded system configuration memory.
For engineers reviewing the AT93C66-10TI-1.8 datasheet, AT93C66-10TI-1.8 pinout, AT93C66-10TI-1.8 application, or AT93C66-10TI-1.8 equivalent, key selection considerations include low-voltage compatibility (1.8V min), TSSOP-8 packaging, industrial temperature range (−40°C to +85°C), and absence of ORG pin functionality in 1.8V variants per datasheet note.
Technical Context
The AT93C66-10TI-1.8 implements a synchronous three-wire serial interface (CS, SK, DI/DO) with start-bit–driven instruction decoding. Its architecture supports seven instructions - READ, EWEN, ERASE, WRITE, ERAL, WRAL, and EWDS - all initiated by CS rising edge and validated by internal state machine sequencing.
Memory organization is fixed at power-on: for 1.8V versions like AT93C66-10TI-1.8, the ORG pin is not functional per datasheet Figure 1 note, locking the device to default x8/x16 mode determined by internal pull-up; no external ORG control is available. Write operations require prior EWEN execution and are self-timed with DO status feedback during active cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4096 bits (512 × 8 or 256 × 16), enabling compact nonvolatile storage for firmware flags, calibration coefficients, or device IDs |
| Supply Voltage | 1.8V to 5.5V - supports direct interfacing with 1.8V logic families and mixed-voltage systems without level shifters |
| Interface | Three-wire serial (CS/SK/DI/DO) - reduces PCB routing complexity vs. SPI/I²C; requires only four signal traces |
| Write Cycle Time | Max 10 ms - enables predictable timing budgeting for host firmware during configuration updates |
| Endurance & Retention | 1 million write cycles / 100 years data retention - suitable for field-updatable systems requiring long service life |
| Operating Temp | −40°C to +85°C - qualified for industrial and automotive under-hood applications per datasheet ordering info |
| Package | TSSOP-8 (8A2), 3.0 mm × 4.4 mm body - surface-mount compatible with automated assembly and space-constrained layouts |
Pinout & Package
AT93C66-10TI-1.8 is housed in an 8-lead Thin Shrink Small Outline Package (TSSOP-8, package code 8A2), measuring 3.0 mm × 4.4 mm with 0.65 mm lead pitch. The package features gull-wing leads, exposed pad not present, and RoHS-compliant lead-free/halogen-free construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; must be held low for entire instruction sequence; rising edge initiates command decode |
| SK | Serial Clock | Input clock synchronizing all data transfers; max 2 MHz at 5V, scaled down per VCC per Table 4 |
| DI | Data Input | Serial command/address/data input; sampled on SK rising edge; requires tDIS/tDIH setup/hold timing |
| DO | Data Output | Open-drain output providing read data or Ready/Busy status; high-impedance when CS high |
| GND | Ground | Reference return path for VCC and I/O; must be low-impedance to minimize noise coupling into DO timing |
| VCC | Power Supply | 1.8V–5.5V supply; decoupling capacitor (0.1 µF) required within 10 mm per layout guidelines |
| ORG | Organization Select | No functional effect in 1.8V variants (AT93C66-10TI-1.8); internally tied to VCC; x8/x16 mode fixed at manufacture |
| DC | Don't Connect | NC pin; must remain unconnected and floating - solder mask coverage recommended to prevent accidental shorts |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | 1.8V minimum VCC enables direct integration with ultra-low-power microcontrollers and battery-backed systems |
| Self-timed write cycle | Eliminates need for external write-time polling or timeout logic - host reads DO pin for Ready/Busy status post-CS high |
| Three-wire interface | Reduces pin count and PCB trace count vs. SPI (4-wire) or I²C (2-wire + pull-ups), simplifying routing in dense layouts |
| Industrial temperature grade | −40°C to +85°C operation verified across full voltage range - suitable for factory automation and transportation electronics |
| High reliability | 1M write cycles and 100-year retention meet long-lifecycle requirements for medical devices and infrastructure equipment |
Applications
| Automotive Instrument Clusters | Industrial Sensor Calibration Storage |
|---|---|
Use Scenario: Storing odometer values, warning thresholds, and display configuration across ignition cycles in digital dashboards. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with guaranteed retention over 15+ year vehicle lifespan; accessed during boot via MCU GPIO bit-banged interface. Use Value: Eliminates backup battery dependency; 1.8V compatibility allows direct connection to 1.8V CAN transceiver power domain. |
Use Scenario: Holding factory-trimmed offset/gain coefficients for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Calibration data repository written once during production test; read at system startup to configure ADC reference points. Use Value: Enables zero-touch field recalibration; 1M endurance supports re-trimming during maintenance without replacement. |
| Embedded System Configuration Memory | Consumer Appliance User Preference Storage |
Use Scenario: Saving network settings (SSID, password), UI language, and brightness presets in smart home gateways. IC Role / Device Role / Timing Role: Persistent configuration store updated infrequently (<10 writes/year); accessed via MCU SPI-like bit-bang driver. Use Value: TSSOP-8 footprint minimizes board area vs. SOIC; 1.8V support aligns with energy-efficient application processors. |
Use Scenario: Retaining cooking time defaults, child lock status, and cycle history in microwave ovens and washing machines. IC Role / Device Role / Timing Role: End-user setting retention across AC power loss; written during button press events with automatic write-enable sequencing. Use Value: No external voltage supervisor needed - built-in EWEN/EWDS protocol prevents accidental writes during brown-out conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT93C66A-10TI-1.8 | Revised version with enhanced ESD robustness (4 kV HBM), improved data retention spec at 85°C, and ORG pin disabled in all voltage grades | Drop-in replacement for new designs; same pinout, timing, and instruction set; preferred for production releases post-2005 | Select AT93C66A-10TI-1.8 for new designs requiring extended lifecycle support and documented qualification to AEC-Q100 Grade 2 |
| M95M04-DRMN6TP/K | 4-Mbit SPI EEPROM (vs. 4-kbit), 1.7–5.5V, 20 MHz SPI interface, WLCSP-8 package; no ORG pin or three-wire mode | Higher density and faster interface but requires SPI controller hardware; incompatible pinout and protocol stack | Choose M95M04-DRMN6TP/K only if migrating to SPI-based architecture and needing >10× capacity increase |
Compared with AT93C66-10TI-1.8, the AT93C66A-10TI-1.8 offers identical functionality with improved reliability specs and ongoing manufacturing support, while the M95M04-DRMN6TP/K provides higher density and speed at the cost of interface and software incompatibility.
Availability
AT93C66-10TI-1.8 is available at Aetrix Electronics and suitable for automotive instrument clusters, industrial sensor calibration storage, and embedded system configuration memory requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for AT93C66-10TI-1.8 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 acquired Atmel in 2016 and maintains legacy Atmel memory products including the AT93C series, emphasizing industrial reliability and long-term supply assurance.
The AT93C66-10TI-1.8 belongs to Microchip's legacy serial EEPROM product line, designed specifically for cost-sensitive, low-pin-count applications where three-wire simplicity, wide voltage operation, and proven field reliability outweigh higher-speed interface needs.
FAQ
What is the function of the ORG pin on the AT93C66-10TI-1.8?
The ORG pin has no functional effect on the AT93C66-10TI-1.8. As explicitly stated in the datasheet Figure 1 note, "The feature is not available on the 1.8V devices." For AT93C66-10TI-1.8, memory organization (512 × 8 or 256 × 16) is fixed at manufacture and cannot be selected externally. This differs from 2.7V variants where ORG controls x8/x16 mode.
Does the AT93C66-10TI-1.8 support write protection at the hardware level?
The AT93C66-10TI-1.8 does not include dedicated hardware write-protect pins (e.g., WP pin). Protection relies entirely on the Erase/Write Disable (EWDS) instruction: after executing EWDS, all programming commands (WRITE, ERASE, etc.) are blocked until EWEN is issued again. This software-controlled lock requires proper firmware sequencing but eliminates need for external components.
What is the maximum clock frequency supported by the AT93C66-10TI-1.8 at 1.8V?
Per Table 4 of the datasheet, the maximum SK clock frequency for AT93C66-10TI-1.8 is 0.25 MHz when VCC = 1.8V to 5.5V. This is significantly lower than the 2 MHz achievable at 5V. Designers must scale host bit-bang timing accordingly - e.g., minimum SK period = 4000 ns - to ensure reliable communication across the full voltage range.
Can the AT93C66-10TI-1.8 be used in automotive applications requiring AEC-Q200 qualification?
The AT93C66-10TI-1.8 is specified for industrial temperature range (−40°C to +85°C) and labeled "Automotive Grade" in features, but it is not AEC-Q200 qualified. For AEC-Q200 compliance, Microchip recommends the AT93C66A-10TI-1.8, which carries formal qualification documentation and enhanced stress-test margins aligned with automotive reliability standards.
Is the AT93C66-10TI-1.8 pin-compatible with the AT93C66-10TI-2.7 variant?
Yes, AT93C66-10TI-1.8 and AT93C66-10TI-2.7 share identical TSSOP-8 (8A2) packaging, pinout, and mechanical dimensions. However, electrical behavior differs: the 1.8V variant operates down to 1.8V and disables the ORG pin, while the 2.7V variant supports 2.7–5.5V and retains ORG functionality. Interchangeability requires verifying system voltage and ORG usage.
AT93C66-10TI-1.8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 4Kbit
- Memory Organization:
- 512 x 8, 256 x 16
- Memory Interface:
- 3-Wire Serial
- Clock Frequency:
- 2 MHz
- Write Cycle Time - Word, Page:
- 10ms
- Access Time:
- -
- Voltage - Supply:
- 1.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
AT93C66-10TI-1.8 FAQ
1.How can I place an order for AT93C66-10TI-1.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT93C66-10TI-1.8 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 AT93C66-10TI-1.8 reliable?
The price and inventory of AT93C66-10TI-1.8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT93C66-10TI-1.8 is usually 5 days.
3.What payment methods are accepted for AT93C66-10TI-1.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT93C66-10TI-1.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT93C66-10TI-1.8?
AT93C66-10TI-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT93C66-10TI-1.8 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 AT93C66-10TI-1.8?
For technical support, including AT93C66-10TI-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT93C66-10TI-1.8 requirements.
6.How does Aetrix verify that AT93C66-10TI-1.8 is sourced from the original manufacturer or authorized distributors?
All AT93C66-10TI-1.8 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 AT93C66-10TI-1.8 meets industry standards.
7.What is the process for return or replacement of AT93C66-10TI-1.8?
All AT93C66-10TI-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with AT93C66-10TI-1.8, 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 AT93C66-10TI-1.8 part is unused and in its original packaging.
Return procedure for AT93C66-10TI-1.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT93C66-10TI-1.8 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…
