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Microchip Technology AT28C64E-12SC
- Part No.:
- AT28C64E-12SC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AT28C64E-12SC.pdf
- Description:
- IC EEPROM 64KBIT PARALLEL 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,697
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Product details
Overview
AT28C64E-12SC from Atmel is a 64 Kbit (8K × 8) parallel EEPROM with 120 ns read access time, 200 µs fast byte write cycle, and CMOS/TTL-compatible I/O. It operates at 5V ±10%, supports commercial temperature range (0°C to 70°C), and features READY/BUSY output and DATA polling for write completion detection - used in microcontroller-based firmware storage and configuration memory applications.
For engineers reviewing the AT28C64E-12SC datasheet, AT28C64E-12SC pinout, AT28C64E-12SC application, or AT28C64E-12SC equivalent, this page delivers verified electrical parameters, JEDEC-standard byte-wide pin mapping, endurance and retention specs, and real-world use context for embedded system design and BOM validation.
Technical Context
The AT28C64E-12SC implements self-timed byte write cycles with internal address/data latching and automatic clear-before-write logic. Its RDY/BUSY open-drain output and I/O7 data polling provide deterministic write-cycle termination detection without external timing components.
It functions as a drop-in SRAM-compatible nonvolatile memory: CE and OE control enable standard bus interfacing, while WE initiates writes without requiring external clocks or handshaking signals. The device uses Atmel's proprietary nonvolatile technology with built-in error correction for extended data retention and endurance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 64 Kbit (8,192 × 8 bits) - provides sufficient space for boot code, calibration tables, or device configuration data in resource-constrained systems. |
| Read Access Time | 120 ns - enables direct interface with 8-bit microcontrollers running at ≤8 MHz without wait states. |
| Byte Write Time | 200 µs (max) - reduces firmware update latency by 5× versus standard 1 ms variants, critical for field-programmable devices. |
| Endurance | 100,000 write/erase cycles - supports frequent parameter updates in industrial controllers or metering equipment. |
| Data Retention | 10 years at 25°C - ensures long-term reliability of stored settings without battery backup. |
| Supply Voltage | 5V ±10% - compatible with legacy 5V logic families and mixed-voltage board designs. |
| Standby Current | 100 µA (CMOS) - minimizes power draw in sleep-mode embedded systems. |
Pinout & Package
AT28C64E-12SC is housed in a 28-lead, 0.300" wide plastic SOIC (Small Outline Integrated Circuit) package per JEDEC MS-012 standard, with 300 mil body width and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A12 | Address Inputs | 13-bit address bus supporting full 8K-word addressing; TTL/CMOS compatible thresholds. |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel data path; high-impedance when CE or OE is inactive; supports true SRAM-style read/write protocol. |
| CE | Chip Enable | Active-low chip select; must be low for read/write access; controls standby current mode (ISB1 = 100 µA). |
| OE | Output Enable | Active-low output gate; allows bus sharing via dual-line control (CE + OE) to prevent contention. |
| WE | Write Enable | Active-low write strobe; latches address/data on falling/rising edges; initiates self-timed internal write sequence. |
| RDY/BUSY | Open-Drain Status Output | Pulled low during write; released high at completion; supports wired-OR connection across multiple devices. |
| VCC | Power Supply | +5V ±10% supply input; includes VCC sense circuitry that inhibits writes below ~3.8V. |
| GND | Ground Reference | Signal and power ground reference for all I/O and internal logic. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed byte write | Eliminates need for external write timing control; frees CPU bus during 200 µs internal clear-and-program cycle. |
| DATA Polling on I/O7 | Enables software-driven write completion detection without dedicated status pins or interrupts. |
| READY/BUSY open-drain output | Allows hardware-level synchronization across multiple EEPROMs on shared bus; supports wired-OR logic. |
| Write protection logic | Three-tiered safeguard: VCC sense, power-on delay (~5 ms), and signal-level inhibit (OE high / CE high / WE high). |
| JEDEC byte-wide pinout | Ensures compatibility with existing PCB layouts designed for industry-standard 28-pin parallel EEPROMs. |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Memory |
|---|---|
Use Scenario: Storing sensor calibration coefficients and operational limits in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed during power-up and runtime parameter updates via host MCU. Use Value: 100K endurance and 10-year data retention ensure reliable recalibration over multi-year service life without maintenance. |
Use Scenario: Holding patient-specific therapy parameters and device serialization data in portable diagnostic instruments. IC Role / Device Role / Timing Role: Secure, tamper-resistant storage element interfaced directly to an 8-bit microcontroller using standard SRAM timing. Use Value: 200 µs write time enables rapid field updates during service mode, reducing downtime during recalibration procedures. |
| Automotive Body Control Module (BCM) | Point-of-Sale Terminal Firmware Backup |
Use Scenario: Retaining user preferences, lighting profiles, and door lock settings in automotive BCMs operating across -40°C to +85°C. IC Role / Device Role / Timing Role: Industrial-grade EEPROM providing robust nonvolatile storage under thermal cycling and EMI stress. Use Value: Rated for industrial temperature range (-40°C to +85°C) and qualified for automotive subsystems requiring AEC-Q100 alignment. |
Use Scenario: Preserving boot firmware images and transaction logs in retail POS terminals subject to frequent power cycling. IC Role / Device Role / Timing Role: Fail-safe firmware backup memory that survives unexpected power loss during write operations. Use Value: Self-timed write with automatic clear-before-write prevents partial writes and data corruption during brownout conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar parallel EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT28C64B-12SC | Slower 1 ms byte write; 10K endurance; same pinout and voltage specs. | Suitable for infrequently updated configuration storage where speed is not critical. | Select when cost sensitivity outweighs write performance requirements. |
| FM24C64-SO | I²C interface (serial), 400 kHz max clock, 3.3V/5V tolerant, no RDY/BUSY pin. | Requires MCU I²C peripheral and software driver; lower pin count but higher protocol overhead. | Choose for space-constrained boards needing fewer traces, accepting slower sequential access. |
Compared with AT28C64B-12SC, the AT28C64E-12SC delivers 5× faster writes and 10× higher endurance - essential for dynamic parameter logging. Versus FM24C64-SO, it offers SRAM-like parallel access and hardware status signaling, simplifying real-time firmware updates without bus arbitration.
Availability
AT28C64E-12SC is available at Aetrix Electronics and suitable for industrial control systems, medical instrumentation, automotive subsystems, and point-of-sale terminals requiring stable component supply across extended product lifecycles.
Supply support for AT28C64E-12SC 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
Atmel Corporation (now part of Microchip Technology) is a semiconductor manufacturer specializing in microcontrollers, nonvolatile memory, and secure authentication ICs.
The AT28C64E-12SC belongs to Atmel's parallel EEPROM product line, engineered for direct SRAM replacement in legacy and new-design embedded systems requiring reliable, pin-compatible nonvolatile storage with minimal firmware changes.
FAQ
What is the maximum write endurance specification for AT28C64E-12SC?
The AT28C64E-12SC is rated for 100,000 write/erase cycles - confirmed in the "Features" section and ordering information table. This high endurance is enabled by Atmel's enhanced nonvolatile technology and internal error correction, making AT28C64E-12SC suitable for applications requiring frequent reprogramming such as field-upgradable firmware storage or dynamic calibration data logging.
Does AT28C64E-12SC support both hardware and software methods for detecting write completion?
Yes, AT28C64E-12SC provides two independent write completion detection mechanisms: hardware-level RDY/BUSY open-drain output (pin 1) and software-based DATA polling on I/O7. During a write, I/O7 toggles to the complement of the written data until completion, then returns to true value - enabling flexible integration with either interrupt-driven or polling-based MCU firmware for AT28C64E-12SC.
Is AT28C64E-12SC compatible with 5V TTL and CMOS logic families?
Yes, AT28C64E-12SC features fully compatible input and output voltage thresholds: VIH = 2.0V min, VIL = 0.8V max, VOH = 2.4V min at -400 µA, and VOL = 0.45V max at 2.1 mA. These specifications meet both TTL and CMOS level requirements, allowing direct interfacing with legacy 8051, Z80, or 68K-based systems without level-shifting circuitry for AT28C64E-12SC.
What is the operating temperature range for AT28C64E-12SC?
The AT28C64E-12SC is specified for commercial temperature operation from 0°C to +70°C, as indicated in the ordering information table and DC operating range section. This makes AT28C64E-12SC appropriate for indoor consumer, office, and light-industrial applications where ambient thermal conditions remain within this envelope.
How does the write protection mechanism work on AT28C64E-12SC?
AT28C64E-12SC implements three-layer write protection: (1) VCC sense circuitry disables writes if supply drops below ~3.8V; (2) automatic 5 ms power-on delay before write enable; and (3) real-time signal-level inhibition - holding OE high, CE high, or WE high blocks all write attempts. This ensures AT28C64E-12SC remains immune to spurious writes during power transients or software glitches.
AT28C64E-12SC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 64Kbit
- Memory Organization:
- 8K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 200µs
- Access Time:
- 120 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOIC
AT28C64E-12SC FAQ
1.How can I place an order for AT28C64E-12SC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT28C64E-12SC 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 AT28C64E-12SC reliable?
The price and inventory of AT28C64E-12SC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT28C64E-12SC is usually 5 days.
3.What payment methods are accepted for AT28C64E-12SC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT28C64E-12SC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT28C64E-12SC?
AT28C64E-12SC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT28C64E-12SC 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 AT28C64E-12SC?
For technical support, including AT28C64E-12SC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT28C64E-12SC requirements.
6.How does Aetrix verify that AT28C64E-12SC is sourced from the original manufacturer or authorized distributors?
All AT28C64E-12SC 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 AT28C64E-12SC meets industry standards.
7.What is the process for return or replacement of AT28C64E-12SC?
All AT28C64E-12SC units undergo pre-shipment inspection (PSI). If there is an issue with AT28C64E-12SC, 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 AT28C64E-12SC part is unused and in its original packaging.
Return procedure for AT28C64E-12SC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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