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Microchip Technology AT28C64E-12JI
- Part No.:
- AT28C64E-12JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT28C64E-12JI.pdf
- Description:
- IC EEPROM 64KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,954
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Product details
Overview
AT28C64E-12JI from Atmel is a 64 Kbit (8K × 8) parallel EEPROM with 120 ns read access time, 200 µs fast byte write cycle, and industrial temperature range (–40°C to +85°C). It features READY/BUSY open-drain output, DATA polling, CMOS/TTL-compatible I/O, and JEDEC-standard 28-pin PLCC package. Used in firmware storage for embedded controllers requiring nonvolatile, field-upgradable memory.
For engineers reviewing the AT28C64E-12JI datasheet, AT28C64E-12JI pinout, AT28C64E-12JI application, or AT28C64E-12JI equivalent, this page delivers verified timing, endurance (10⁵ cycles), power specs (30 mA active / 100 µA standby), write protection logic, and industrial-grade reliability data - all confirmed for the exact -12JI variant.
Technical Context
The AT28C64E-12JI operates as a byte-addressable parallel EEPROM with self-timed write cycles, internal address/data latching, and automatic clear-before-write. Its RDY/BUSY pin provides hardware-level write completion signaling, while DATA polling on I/O7 enables software-driven status detection without external timing components.
It supports standard microprocessor bus interfacing via CE/OE/WE control logic, requires no external high-voltage programming supply during normal operation, and implements VCC sense (3.8 V threshold), 5 ms power-on delay, and three-pin write inhibit (CE high, OE low, or WE high) for robust inadvertent-write protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 64 Kbit (8,192 × 8 bits) - sufficient for boot code, calibration tables, or configuration data in resource-constrained systems |
| Read Access Time | 120 ns - enables direct replacement of SRAM in legacy 8-bit microcontroller buses without wait-state insertion |
| Byte Write Time | 200 µs (max) - reduces full-memory reprogramming time to ≤1.6 seconds, critical for field firmware updates |
| Endurance | 100,000 write/erase cycles - validated for applications requiring frequent parameter logging or dynamic configuration changes |
| Data Retention | 10 years at +85°C - ensures long-term integrity of stored settings in industrial environments |
| Supply Voltage | 5 V ±10% - compatible with standard TTL/CMOS logic rails and legacy 5 V system designs |
| Operating Temperature | –40°C to +85°C - certified for use in automotive ECUs, industrial PLCs, and outdoor telemetry equipment |
| Standby Current | 100 µA (CMOS) - minimizes quiescent power in battery-backed or energy-sensitive applications |
Pinout & Package
AT28C64E-12JI is packaged in a 32-lead Plastic J-Leaded Chip Carrier (PLCC), JEDEC MS-016AE compliant, with pins 1 and 17 designated "DON'T CONNECT" per official Atmel documentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A12 | Address Inputs | 13-bit address bus supporting full 8K-word addressing; A12 is MSB for 64 Kbit capacity |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface compatible with 8-bit microcontrollers; supports true read/write data transfer |
| CE | Chip Enable | Active-low chip select; when high, device enters high-impedance standby mode regardless of OE/WE state |
| OE | Output Enable | Active-low output gate; controls data bus drivers independently of CE to prevent bus contention |
| WE | Write Enable | Active-low write strobe; initiates self-timed byte write cycle on falling edge; latches address/data internally |
| RDY/BUSY | Open-Drain Status Output | Pulled low during write; released high at completion; supports wired-OR multi-device busy monitoring |
| VCC | Power Supply | +5 V ±10% supply input; powers core logic and I/O buffers; includes internal VCC-sense circuitry |
| GND | Ground Reference | Signal and power return path; decoupling required within 1 cm of VCC pin per datasheet layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Byte Write | Eliminates need for external write timing control; internal timer handles erase-and-program sequence automatically |
| DATA Polling on I/O7 | Enables software-based write completion detection without dedicated status lines or interrupts |
| READY/BUSY Open-Drain Output | Allows multiple AT28C64E-12JI devices to share a single busy line using external pull-up resistor |
| VCC Sense & Power-On Delay | Prevents partial writes during power ramp-up by inhibiting WE until VCC ≥ 3.8 V and 5 ms delay expires |
| JEDEC Byte-Wide Pinout | Ensures drop-in compatibility with industry-standard EPROM/EEPROM sockets and PCB footprints |
| 32-Byte Device ID Area | Accessible via A9 = 12 V; enables unique serialization, revision tracking, or factory calibration storage |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Data |
|---|---|
Use Scenario: Storing user-defined I/O mapping, PID tuning parameters, and alarm thresholds in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed during boot and runtime via 8-bit parallel bus; RDY/BUSY used for deterministic write synchronization. Use Value: 100,000-cycle endurance supports daily recalibration; 10-year data retention ensures parameter integrity across maintenance intervals without backup power. |
Use Scenario: Holding sensor calibration coefficients, patient-specific therapy profiles, and regulatory audit logs in portable diagnostic equipment. IC Role / Device Role / Timing Role: Secure, tamper-resistant storage element interfaced to microcontroller via standard memory-mapped bus; write protection prevents accidental overwrite during operation. Use Value: VCC-sense and triple write-inhibit logic guarantee zero unintended writes during brown-out or reset events - critical for FDA-compliant data integrity. |
| Automotive ECU Bootloader Code | Legacy Industrial Instrumentation Firmware |
Use Scenario: Hosting bootloader firmware that validates and loads main application code from external flash in engine control units operating under wide thermal stress. IC Role / Device Role / Timing Role: Read-only execution memory during startup; 120 ns access time meets tight timing budgets of 8/16-bit MCUs without wait states. Use Value: Industrial temperature rating (–40°C to +85°C) and 10-year retention ensure reliable boot across vehicle lifetime and environmental extremes. |
Use Scenario: Replacing obsolete EPROMs in aging test equipment, process controllers, and lab instruments where socket compatibility and 5 V operation are mandatory. IC Role / Device Role / Timing Role: Pin-compatible EEPROM substitute for 27C64/27C512 sockets; JEDEC-standard pinout allows direct PCB reuse. Use Value: 200 µs write time cuts firmware update duration by 5× vs. 1 ms variants, reducing downtime during field service and calibration cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar parallel EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT28C64B-12JI | Slower 1 ms byte write; 10⁴ endurance; same pinout, voltage, and temperature range | Suitable for infrequent configuration updates where speed is not critical | Select only if cost sensitivity outweighs write performance and endurance requirements |
| ST M28W640ECB90N1 | 64 Mbit density; 90 ns access; 3.3 V core (5 V tolerant I/O); different pinout and command set | Requires PCB redesign and firmware adaptation; suited for higher-density upgrades | Consider only for new designs targeting scalability beyond 64 Kbit; not a drop-in replacement |
Compared with AT28C64B-12JI, the AT28C64E-12JI delivers 5× faster writes and 10× higher endurance - essential for dynamic parameter storage. Versus ST M28W640ECB90N1, it offers true pin-to-pin compatibility and zero firmware changes but at lower density and slower speed.
Availability
AT28C64E-12JI is available at Aetrix Electronics and suitable for industrial control systems, medical instrumentation, automotive diagnostics, and legacy equipment modernization requiring stable component supply and long-term obsolescence management.
Supply support for AT28C64E-12JI 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 fabless semiconductor company specializing in microcontrollers, nonvolatile memory, and secure authentication ICs for embedded applications.
The AT28C64E-12JI belongs to Atmel's parallel EEPROM product line, designed specifically for 5 V systems needing reliable, pin-compatible replacements for EPROMs and earlier-generation EEPROMs in industrial and automotive contexts.
FAQ
What is the maximum byte write time for AT28C64E-12JI?
The AT28C64E-12JI has a guaranteed maximum byte write time of 200 µs, as specified in the AC Write Characteristics table. This is a key differentiator from the standard AT28C64B variant (1 ms), enabling rapid field updates. The internal control timer manages the entire erase-and-program sequence autonomously after WE assertion, and the value is validated across the full –40°C to +85°C industrial temperature range.
Does AT28C64E-12JI support both hardware and software write completion detection?
Yes, AT28C64E-12JI supports dual write completion methods: hardware signaling via the open-drain RDY/BUSY pin (pulled low during write, released high at completion), and software polling of I/O7 (returns complement of written data until complete, then true data). Both mechanisms are fully functional in the AT28C64E-12JI variant and require no external components - enabling flexible integration with any 8-bit microcontroller architecture.
What is the purpose of the 32-byte device identification area in AT28C64E-12JI?
The AT28C64E-12JI includes 32 bytes of additional EEPROM space accessible at addresses 1FE0H–1FFFH, activated by applying 12.0 V ± 0.5 V to pin A9. This area is intended for user-defined device serialization, manufacturing lot tracking, or calibration data storage. Unlike main array writes, this region uses the same 200 µs write cycle and 10⁵ endurance rating, and is electrically isolated from standard memory operations to prevent accidental overwrites.
How does write protection work on AT28C64E-12JI?
AT28C64E-12JI implements three independent write protection layers: (1) VCC sense - write inhibited if supply drops below ~3.8 V; (2) 5 ms power-on delay - WE is ignored until VCC stabilizes and internal timer expires; (3) three-pin logic - write disabled if CE is high, OE is low, or WE is high. These protections operate simultaneously and are inherent to the AT28C64E-12JI silicon design - no external circuitry required.
Is AT28C64E-12JI pin-compatible with older AT28C64 variants?
Yes, AT28C64E-12JI maintains full JEDEC-standard byte-wide pin compatibility with all AT28C64X and AT28C64B variants in the same PLCC-32 package, including identical A0–A12, I/O0–I/O7, CE, OE, WE, RDY/BUSY, VCC, and GND assignments. Pin 1 is RDY/BUSY (not NC), and pins 1 & 17 are explicitly marked "DON'T CONNECT" - matching the mechanical and electrical interface of legacy designs.
AT28C64E-12JI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- 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:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT28C64E-12JI FAQ
1.How can I place an order for AT28C64E-12JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT28C64E-12JI 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-12JI reliable?
The price and inventory of AT28C64E-12JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT28C64E-12JI is usually 5 days.
3.What payment methods are accepted for AT28C64E-12JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT28C64E-12JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT28C64E-12JI?
AT28C64E-12JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT28C64E-12JI 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-12JI?
For technical support, including AT28C64E-12JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT28C64E-12JI requirements.
6.How does Aetrix verify that AT28C64E-12JI is sourced from the original manufacturer or authorized distributors?
All AT28C64E-12JI 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-12JI meets industry standards.
7.What is the process for return or replacement of AT28C64E-12JI?
All AT28C64E-12JI units undergo pre-shipment inspection (PSI). If there is an issue with AT28C64E-12JI, 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-12JI part is unused and in its original packaging.
Return procedure for AT28C64E-12JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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