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Microchip Technology 93C66C-E/ST
- Part No.:
- 93C66C-E/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93C66C-E/ST.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,033
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Product details
Overview
93C66C-E/ST from Microchip Technology Inc. is a 4 Kbit low-voltage serial EEPROM with Microwire-compatible 3-wire interface, ORG-pin-selectable 8-/16-bit word organization, and 4.5–5.5 V operating range. It delivers 1 million erase/write cycles, >200-year data retention, and integrated power-on/off data protection. Used in industrial control systems for parameter storage and calibration data backup.
For engineers reviewing the 93C66C-E/ST datasheet, 93C66C-E/ST pinout, 93C66C-E/ST application, or 93C66C-E/ST equivalent, key selection criteria include VCC range (4.5–5.5 V), ORG-configurable word size, industrial/automotive temperature support (−40°C to +125°C), and TSSOP-8 package compatibility with legacy 93C-series designs.
Technical Context
The 93C66C-E/ST implements a synchronous serial Microwire interface with CS, CLK, DI, and DO signals, plus dedicated ORG pin for runtime memory width selection (x8 when ORG = VSS, x16 when ORG = VCC). Its self-timed erase/write architecture eliminates external timing components.
It supports full-memory operations including ERAL (Erase All) and WRAL (Write All), both requiring VCC ≥ 4.5 V. Ready/Busy status is reported via DO pin polling during programming, with automatic EWDS power-up default and explicit EWEN/EWDS command control for write protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4 Kbit (512 × 8 or 256 × 16, selectable via ORG pin) |
| VCC Range | 4.5 V to 5.5 V - ensures compatibility with 5 V logic systems and rejects brown-out corruption |
| Temp Range | −40°C to +125°C (Automotive E-grade) - validated for under-hood and industrial ambient operation |
| Endurance | 1,000,000 erase/write cycles - supports frequent field calibration updates over product lifetime |
| Data Retention | >200 years at +25°C - guarantees long-term integrity of stored configuration without refresh |
| Write Cycle Time | 2 ms (TWC) - enables fast firmware parameter updates without blocking host MCU execution |
| Max Clock Frequency | 3 MHz at VCC ≥ 4.5 V - allows high-throughput serial access while maintaining noise margin |
Pinout & Package
93C66C-E/ST is packaged in an 8-lead TSSOP (ST) with 3.0 mm × 4.4 mm footprint and 0.65 mm lead pitch. Pin 1 is marked by laser dot; device is Pb-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions to reset internal state |
| CLK | Serial Clock | Synchronizes all data transfers on rising edge; stoppable mid-sequence without corruption |
| DI | Data Input | Accepts Start bit, opcode, address, and write data; requires pull-down if unused |
| DO | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z on CS falling edge |
| VSS | Ground | Reference for all I/O and internal circuitry; must be low-impedance connection |
| ORG | Organization Control | Logic level selects x8 (VSS) or x16 (VCC); must be stable before instruction start |
| NC | No Connect | Internally unconnected; may be left floating or tied to VSS for mechanical stability |
| VCC | Power Supply | 4.5–5.5 V supply; includes POR detection at 3.8 V to inhibit writes during power ramp |
Key Features
| Feature | Design Value |
|---|---|
| ORG-pin word-size selection | Enables single BOM part to serve both 8-bit microcontroller and 16-bit DSP host interfaces |
| Self-timed Erase/Write | Eliminates need for external wait-state generation or clock stretching in host firmware |
| Auto-ERAL before WRAL | Guarantees clean memory state prior to bulk write, preventing partial-page corruption |
| Power-on/off data protection | Hardware-level VCC monitoring blocks writes below 3.8 V, preventing bit corruption during brown-out |
| Ready/Busy polling via DO | Allows non-blocking host operation: MCU can service interrupts while waiting for write completion |
Applications
| Industrial Sensor Calibration | Automotive Body Control Module |
|---|---|
Use Scenario: Storing factory-trimmed sensor offset/gain coefficients and field-updated linearization tables in pressure/temperature transducers. IC Role / Device Role / Timing Role: Nonvolatile parameter store with ORG set to x8 for 8-bit MCU interface; accessed during power-up initialization and periodic recalibration. Use Value: Eliminates external trimming potentiometers and enables digital calibration traceability across production batches. | Use Scenario: Holding seat position memory, mirror angle presets, and lighting configuration profiles in automotive door modules. IC Role / Device Role / Timing Role: EEPROM configured as x16 (ORG = VCC) for efficient 16-bit CAN message payload storage; accessed via microcontroller SPI-to-Microwire bridge. Use Value: Survives 125°C under-hood thermal cycling and supports 1M-cycle endurance for daily user adjustments over 15-year vehicle life. |
| Medical Infusion Pump Settings | Industrial PLC Configuration Backup |
Use Scenario: Securing drug library parameters, dose limits, and clinician access codes in battery-backed infusion devices. IC Role / Device Role / Timing Role: Safety-critical nonvolatile storage with EWEN/EWDS write-lock sequence; accessed only during authorized service mode. Use Value: Hardware-enforced write protection prevents accidental overwrite during routine operation or firmware update. | Use Scenario: Preserving ladder logic I/O mapping, PID tuning constants, and alarm thresholds across PLC power cycles and firmware reloads. IC Role / Device Role / Timing Role: Robust configuration archive with ERAL/WRAL support for factory reset; interfaced to 5 V tolerant industrial MCU GPIOs. Use Value: Enables zero-downtime field reconfiguration: new settings written while system remains operational, then activated on next reboot. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC66C-E/ST | Wider VCC range (2.5–5.5 V); same pinout, ORG function, and instruction set | Better suited for mixed-voltage systems (e.g., 3.3 V MCU + 5 V peripherals) where 93C66C-E/ST's 4.5–5.5 V range is restrictive | Select 93LC66C-E/ST if system operates below 4.5 V or requires broader supply tolerance |
| 93AA66C-E/ST | Lowest VCC range (1.8–5.5 V); identical package and ORG behavior | Enables direct replacement in battery-powered portable equipment where 93C66C-E/ST cannot operate below 4.5 V | Choose 93AA66C-E/ST for ultra-low-power or single-cell Li-ion applications needing EEPROM down to 1.8 V |
Compared with 93LC66C-E/ST and 93AA66C-E/ST, the 93C66C-E/ST offers highest noise immunity and reduced susceptibility to supply transients due to its narrower, higher-VCC operating window - ideal for electrically noisy 5 V industrial bus environments.
Availability
93C66C-E/ST is available at Aetrix Electronics and suitable for industrial control, automotive electronics, and medical device applications requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for 93C66C-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 microcontrollers, analog, and Flash-IP solutions, serving industrial, automotive, and consumer markets with high-reliability semiconductor products.
The 93C66C-E/ST belongs to Microchip's legacy 93XX serial EEPROM family, designed specifically for cost-sensitive, space-constrained systems requiring robust nonvolatile storage with minimal external components and proven field reliability.
FAQ
What is the function of the ORG pin on the 93C66C-E/ST?
The ORG pin on the 93C66C-E/ST selects memory word size: tied to VSS for 512 × 8-bit organization, or to VCC for 256 × 16-bit organization. This pin must be held at a valid logic level before any instruction starts; floating ORG causes undefined behavior. The 93C66C-E/ST requires this pin, unlike A/B variants which fix word size.
Does the 93C66C-E/ST support sequential read operations?
Yes, the 93C66C-E/ST supports sequential read: when CS remains high after a READ instruction, the device automatically increments the address counter and outputs subsequent bytes (or words) on each CLK rising edge. This enables efficient block reads without re-sending addresses, reducing host software overhead and bus traffic.
What is the minimum VCC voltage required for reliable operation of the 93C66C-E/ST?
The 93C66C-E/ST requires VCC ≥ 4.5 V for all operations, with power-on reset (POR) threshold at 3.8 V. Below 4.5 V, write/erase functions are inhibited, and the device enters a protected state. This differs from 93LC66C-E/ST (2.5 V min) and 93AA66C-E/ST (1.8 V min), making 93C66C-E/ST optimal for stable 5 V systems.
How does the 93C66C-E/ST indicate readiness after a write operation?
The 93C66C-E/ST uses the DO pin for Ready/Busy status: during erase or write, DO outputs low while programming is active and transitions high when complete. Host must bring CS high for ≥250 ns after TCSL to sample status. Issuing a Start bit then lowering CS clears the status flag, enabling immediate polling restart.
Is the 93C66C-E/ST pin-compatible with other 93XX66C variants in TSSOP-8 package?
Yes, the 93C66C-E/ST shares identical TSSOP-8 pinout, electrical characteristics, and instruction set with 93AA66C-E/ST and 93LC66C-E/ST. All three support ORG-based word-size selection and share CS/CLK/DI/DO/ORG/VSS/NC/VCC mapping. Differences lie solely in VCC operating ranges and temperature grade validation - not pin function or layout.
93C66C-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:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 4Kbit
- Memory Organization:
- 512 x 8, 256 x 16
- Memory Interface:
- Microwire
- Clock Frequency:
- 3 MHz
- Write Cycle Time - Word, Page:
- 2ms
- Access Time:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
93C66C-E/ST FAQ
1.How can I place an order for 93C66C-E/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C66C-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 93C66C-E/ST reliable?
The price and inventory of 93C66C-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 93C66C-E/ST is usually 5 days.
3.What payment methods are accepted for 93C66C-E/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C66C-E/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C66C-E/ST?
93C66C-E/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C66C-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 93C66C-E/ST?
For technical support, including 93C66C-E/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C66C-E/ST requirements.
6.How does Aetrix verify that 93C66C-E/ST is sourced from the original manufacturer or authorized distributors?
All 93C66C-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 93C66C-E/ST meets industry standards.
7.What is the process for return or replacement of 93C66C-E/ST?
All 93C66C-E/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93C66C-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 93C66C-E/ST part is unused and in its original packaging.
Return procedure for 93C66C-E/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93C66C-E/ST Tags
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