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Microchip Technology AT28C64X-15JI
- Part No.:
- AT28C64X-15JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT28C64X-15JI.pdf
- Description:
- IC EEPROM 64KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT28C64X-15JI from Atmel is an industrial-grade 64 Kbit (8K × 8) parallel EEPROM with 150 ns read access time, self-timed byte write cycle, and CMOS/TTL-compatible I/O. It operates from 5V ±10%, draws 45 mA active current and 100 µA standby current, and supports JEDEC-standard pinout for microprocessor interfacing in embedded control and firmware storage applications.
For engineers reviewing the AT28C64X-15JI datasheet, AT28C64X-15JI pinout, AT28C64X-15JI application, or AT28C64X-15JI equivalent, key selection criteria include industrial temperature range (-40°C to +85°C), RDY/BUSY omission in X-variant, fast byte write timing (1 ms), DATA polling support, and PLCC-32 package compatibility with legacy board designs.
Technical Context
The AT28C64X-15JI implements a parallel EEPROM architecture with internal address/data latching and automatic clear-before-write logic. Its self-timed write cycle eliminates external timing control, while DATA polling on I/O7 provides software-based write completion detection without requiring RDY/BUSY hardware signaling.
It uses Atmel's nonvolatile technology with built-in error correction for extended endurance (10⁴ cycles) and 10-year data retention. The device includes VCC sense, power-on delay, and input-level write inhibit mechanisms to prevent inadvertent writes-critical for field-updatable firmware storage in unattended systems.
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 microcontroller-based systems |
| Read Access Time | 150 ns max; enables direct interface with 8-bit microprocessors running at ≤6 MHz without wait states |
| Byte Write Time | 1 ms typical; self-timed operation frees CPU bus during programming, supporting background firmware updates |
| Supply Voltage | 5V ±10%; compatible with standard TTL/CMOS logic rails and legacy 5V system power domains |
| Operating Temperature | -40°C to +85°C; qualified for industrial environments including factory automation and outdoor telemetry |
| Standby Current | 100 µA max; enables low-power operation in battery-backed or energy-constrained embedded nodes |
| Endurance | 10,000 write/erase cycles; supports repeated field calibration or parameter logging over product lifetime |
| Data Retention | 10 years at +85°C; ensures long-term reliability of stored configuration without refresh |
Pinout & Package
AT28C64X-15JI is supplied in a 32-lead Plastic J-Leaded Chip Carrier (PLCC) package per JEDEC MS-016 AE, with 1.27 mm pitch and 13.7 mm × 13.1 mm body size. Pin 1 is index-marked; pins 1 and 17 are designated "Don't Connect" (DC) per datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A12 | Address Inputs | 13-bit address bus for accessing all 8,192 memory locations; TTL/CMOS compatible |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel data path; supports true read/write operations without direction control lines |
| CE | Chip Enable | Active-low chip select; enables memory access when low and OE is low / WE is high |
| OE | Output Enable | Active-low output gate; places I/O pins in high-impedance state when high to prevent bus contention |
| WE | Write Enable | Active-low write strobe; initiates self-timed byte write on falling edge with data latched on rising edge |
| RDY/BUSY | Open-Drain Status Output | Not connected (NC) on AT28C64X variant; write completion must be detected via DATA polling only |
| VCC | Power Supply | +5V ±10% supply; powers core logic and memory array; requires local decoupling |
| GND | Ground Reference | Signal and power ground reference; separate ground plane recommended for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed byte write | Eliminates need for external timing circuitry; internal control timer manages erase-and-program sequence automatically |
| DATA polling on I/O7 | Enables software-driven write completion detection by reading complemented data until true value appears |
| VCC sense and power-on delay | Prevents accidental writes during power ramp-up by inhibiting WE until VCC ≥3.8V and 5 ms delay expires |
| JEDEC-standard pinout | Ensures drop-in compatibility with existing 28-pin and 32-pin parallel EEPROM footprints across multiple vendors |
| Industrial temperature rating | Validated operation from -40°C to +85°C supports deployment in harsh environments without derating |
Applications
| Industrial PLC Firmware Storage | Medical Device Calibration Data |
|---|---|
Use Scenario: Storing firmware images and updateable logic routines in programmable logic controllers deployed in factory-floor environments. IC Role / Device Role / Timing Role: Nonvolatile program memory accessed directly by 8-bit microcontrollers via parallel bus; read during boot, written during field upgrades. Use Value: 150 ns access time avoids CPU wait states; industrial temperature rating ensures reliability in uncontrolled ambient conditions. | Use Scenario: Retaining patient-specific calibration coefficients and sensor offset values in portable diagnostic equipment. IC Role / Device Role / Timing Role: Parameter storage element with guaranteed 10-year data retention and 10⁴-cycle endurance for recalibration events. Use Value: Low 100 µA standby current extends battery life; VCC-sense protection prevents corruption during brownout conditions. |
| Automotive ECU Configuration | Telecom Line Card Bootloader |
Use Scenario: Holding vehicle-specific configuration maps (e.g., transmission shift points, emissions tuning) in engine control units. IC Role / Device Role / Timing Role: Field-programmable configuration memory interfaced to automotive-grade MCUs; written once per service interval. Use Value: RDY/BUSY omission is acceptable due to robust DATA polling support; 5V tolerance matches legacy automotive power domains. | Use Scenario: Storing bootloader code and initialization parameters for line cards in carrier-class telecom switches. IC Role / Device Role / Timing Role: Primary boot memory mapped into MCU address space; read at power-on reset, updated during remote firmware patches. Use Value: JEDEC pinout allows reuse of existing PCB layouts; 1 ms write time enables efficient in-system updates without service interruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar parallel EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT28C64B-15JI | Same 64 Kbit capacity, 150 ns speed, and PLCC-32 package; improved endurance (100K cycles) and faster write (200 µs) due to 'E' variant process | Supports higher-frequency field updates and longer service life in high-write applications like data loggers | Select when write endurance or speed is critical; requires verification of VH (12V) programming voltage compatibility |
| MX28LV640CT-15G | 64 Kbit parallel EEPROM in TSOP-28; 150 ns access, but no RDY/BUSY pin and different pinout (no A12, NC mapping differs) | Requires PCB redesign for TSOP footprint and signal routing; lacks PLCC mechanical robustness for vibration-prone applications | Consider for space-constrained designs where SOIC/TSOP is preferred; verify DATA polling behavior matches AT28C64X-15JI |
Compared with AT28C64X-15JI, AT28C64B-15JI offers superior endurance and write speed at identical packaging and interface, while MX28LV640CT-15G trades mechanical ruggedness and pin compatibility for smaller footprint-making it suitable only where layout revision is feasible and vibration resistance is not required.
Availability
AT28C64X-15JI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device calibration data retention, and automotive ECU configuration requiring stable component supply across extended production lifecycles.
Supply support for AT28C64X-15JI 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 AT28C64X series was designed as a drop-in replacement for EPROM and early EEPROM solutions in 5V microprocessor systems, emphasizing ease of integration, industrial reliability, and backward compatibility with legacy parallel bus architectures.
FAQ
What is the maximum operating temperature range for the AT28C64X-15JI?
The AT28C64X-15JI is rated for industrial operation from -40°C to +85°C. This specification is validated per the datasheet's DC and AC operating range table and applies to all electrical parameters including read access time, write timing, and current consumption. The AT28C64X-15JI maintains full functionality across this range without derating, making it suitable for deployment in factory automation, outdoor infrastructure, and transportation electronics where ambient temperatures exceed commercial limits.
Does the AT28C64X-15JI include a RDY/BUSY output pin?
No, the AT28C64X-15JI does not implement the RDY/BUSY function. As confirmed in the Device Operation section, "The RDY/BUSY pin is not connected for the AT28C64X." Instead, write completion must be detected using DATA polling on I/O7-reading the target location returns the complement of the written data until the operation completes, then returns true data. This behavior is fully supported in the AT28C64X-15JI and requires no hardware modification.
What is the write endurance specification for the AT28C64X-15JI?
The AT28C64X-15JI guarantees a minimum of 10,000 write/erase cycles per memory location, as stated in the Features section under "High Reliability." This endurance rating is measured under standard conditions (VCC = 5V ±10%, TA = 25°C) and reflects the number of times a given byte can be reliably programmed and erased before failure. The AT28C64X-15JI achieves this using Atmel's nonvolatile technology with internal error correction, ensuring consistent performance across its industrial temperature range.
Can the AT28C64X-15JI be used as a direct replacement for the AT28C64-15JI?
Yes, the AT28C64X-15JI is functionally and pin-compatible with the AT28C64-15JI in all respects except RDY/BUSY functionality. Both share identical memory organization (8K × 8), timing specifications (150 ns read, 1 ms write), supply requirements (5V ±10%), package (PLCC-32), and pinout-including NC assignments for pins 1 and 17. Since the AT28C64X-15JI omits RDY/BUSY (documented as NC), systems relying solely on DATA polling will operate identically; those using RDY/BUSY must be reconfigured to use polling instead.
What package type is used for the AT28C64X-15JI?
The AT28C64X-15JI uses a 32-lead Plastic J-Leaded Chip Carrier (PLCC) package, designated as "32J" in Atmel's ordering information. Its dimensions conform to JEDEC standard MS-016 AE, with a 1.27 mm lead pitch and overall body size of 13.7 mm × 13.1 mm. The package features an index mark for pin 1 identification and specifies pins 1 and 17 as "Don't Connect" (DC), consistent across all AT28C64X-15JI units shipped by Aetrix Electronics.
AT28C64X-15JI 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:
- 1ms
- Access Time:
- 150 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)
AT28C64X-15JI FAQ
1.How can I place an order for AT28C64X-15JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT28C64X-15JI 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 AT28C64X-15JI reliable?
The price and inventory of AT28C64X-15JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT28C64X-15JI is usually 5 days.
3.What payment methods are accepted for AT28C64X-15JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT28C64X-15JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT28C64X-15JI?
AT28C64X-15JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT28C64X-15JI 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 AT28C64X-15JI?
For technical support, including AT28C64X-15JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT28C64X-15JI requirements.
6.How does Aetrix verify that AT28C64X-15JI is sourced from the original manufacturer or authorized distributors?
All AT28C64X-15JI 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 AT28C64X-15JI meets industry standards.
7.What is the process for return or replacement of AT28C64X-15JI?
All AT28C64X-15JI units undergo pre-shipment inspection (PSI). If there is an issue with AT28C64X-15JI, 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 AT28C64X-15JI part is unused and in its original packaging.
Return procedure for AT28C64X-15JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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