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Microchip Technology AT28C64X-15PI
- Part No.:
- AT28C64X-15PI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
AT28C64X-15PI.pdf
- Description:
- IC EEPROM 64KBIT PARALLEL 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,543
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Product details
Overview
AT28C64X-15PI from Atmel is a 64 Kbit (8K × 8) parallel EEPROM with JEDEC-standard byte-wide pinout, 150 ns read access time, 1 ms fast byte write cycle, and industrial temperature range (–40°C to +85°C). It operates from 5V ±10%, supports DATA polling and READY/BUSY signaling (RDY/BUSY pin unconnected in AT28C64X variant), and is used for nonvolatile configuration storage in microcontroller-based embedded systems.
For engineers reviewing the AT28C64X-15PI datasheet, AT28C64X-15PI pinout, AT28C64X-15PI application, or AT28C64X-15PI equivalent, key selection criteria include its self-timed write architecture, CMOS/TTL compatibility, 10⁴ endurance cycles, low 100 µA standby current, and PDIP-28 industrial-grade packaging.
Technical Context
The AT28C64X-15PI implements a parallel EEPROM architecture with internal address/data latching and an autonomous control timer that manages erase-before-write sequencing without external timing components. Its RDY/BUSY output is internally disconnected per datasheet specification, requiring reliance on DATA polling (I/O7 complement detection) for write completion signaling.
It features dual write-inhibit mechanisms-VCC sense (write disabled below 3.8 V) and active-level control (OE high, CE high, or WE high blocks writes)-and supports CHIP CLEAR via 12 V on A9 and 10 ms WE pulse. The device includes 32 bytes of dedicated identification EEPROM at addresses 1FE0H–1FFFH.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 64 Kbit (8,192 × 8 bits); sufficient for firmware parameter tables or calibration data in resource-constrained controllers. |
| 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 cycle eliminates need for external write timing logic or software delays. |
| Endurance | 10,000 write/erase cycles; validated for field-updatable configuration storage with moderate update frequency. |
| Standby Current | 100 µA max (CMOS mode); supports low-power operation in battery-backed or energy-sensitive applications. |
| Supply Voltage | 5 V ±10%; compatible with legacy 5 V logic families and mixed-voltage system backplanes. |
| Operating Temperature | –40°C to +85°C; qualified for industrial automation, motor control, and outdoor instrumentation environments. |
Pinout & Package
AT28C64X-15PI is supplied in a 28-pin Plastic Dual Inline Package (PDIP), 0.600" wide, JEDEC MS-011 AB compliant. Pin 1 is NC (No Connect), and RDY/BUSY functionality is disabled per AT28C64X variant specification.
| 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 interface; I/O7 used for DATA polling during write completion detection. |
| CE | Chip Enable | Active-low chip select; when high, places outputs in high-impedance state to prevent bus contention. |
| OE | Output Enable | Active-low read control; must be low with CE low and WE high for valid read access. |
| WE | Write Enable | Active-low write strobe; falling edge latches address, rising edge latches data for self-timed byte write. |
| VCC | Power Supply | +5 V ±10% supply input; internal VCC sense circuitry inhibits writes if voltage drops below 3.8 V. |
| GND | Ground Reference | Signal and power ground return; decoupling capacitor required within 1 cm of VCC/GND pins. |
| NC | No Connect | Pin 1 is unconnected; must remain floating-no external tie or pull-up/down. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed byte write | Eliminates external timing circuitry and software wait loops; internal timer handles erase-and-program sequence automatically. |
| DATA polling support | Enables write completion detection via I/O7 complement read without requiring RDY/BUSY hardware signal. |
| VCC sense write protection | Prevents inadvertent writes during power ramp-up or brownout by disabling WE function below 3.8 V. |
| JEDEC-standard pinout | Ensures drop-in compatibility with existing 28-pin parallel memory sockets and PCB layouts designed for industry-standard EEPROMs. |
| Industrial temperature grade | Validated operation from –40°C to +85°C supports deployment in harsh environments without derating. |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Data Retention |
|---|---|
Use Scenario: Storing I/O mapping, scaling factors, and alarm thresholds in programmable logic controllers deployed in factory-floor cabinets. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed during boot and runtime reconfiguration; read at startup, written infrequently during commissioning or maintenance. Use Value: Ensures parameter persistence across power cycles and supports field updates without requiring battery backup or external NVRAM. |
Use Scenario: Retaining sensor calibration coefficients and user-defined therapy parameters in portable diagnostic equipment. IC Role / Device Role / Timing Role: Secure, long-term data storage element interfaced directly to an 8-bit microcontroller's data bus; accessed only during calibration routines or device initialization. Use Value: Meets 10-year data retention requirement and provides deterministic 150 ns read latency for real-time parameter loading. |
| Automotive Body Control Module Settings | Test Equipment Firmware Patch Storage |
Use Scenario: Holding seat/mirror position presets, lighting profiles, and CAN node configuration in automotive body control units. IC Role / Device Role / Timing Role: Parallel EEPROM used as configuration register bank; accessed via standard microcontroller memory-mapped I/O with no additional glue logic. Use Value: Industrial temperature rating ensures reliability under hood ambient conditions; 10⁴ endurance exceeds lifetime update requirements. |
Use Scenario: Storing field-upgradable firmware patches and instrument-specific calibration offsets in benchtop test systems. IC Role / Device Role / Timing Role: Field-serviceable nonvolatile memory enabling in-situ updates without disassembly or reprogramming jigs. Use Value: 1 ms write time allows rapid patch deployment; DATA polling simplifies host firmware implementation versus interrupt-driven RDY/BUSY handling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar parallel EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT28C64B-15PI | Same pinout and timing; enhanced reliability features including internal error correction and extended data retention (10 years guaranteed). | Identical use cases; preferred where long-term data integrity is critical (e.g., medical or aerospace). | Select AT28C64B-15PI when higher endurance (10⁵ cycles) and built-in ECC are required; otherwise AT28C64X-15PI remains cost-optimized. |
| MX28LV640E-15PI | Same 64 Kbit size and PDIP-28 package; 150 ns access, but requires external VPP (12 V) for write and lacks VCC sense protection. | Suitable for legacy designs already using VPP-based EEPROMs; not recommended for new designs lacking dedicated high-voltage generation. | Choose MX28LV640E-15PI only if migrating from existing VPP-dependent systems; AT28C64X-15PI offers simpler 5 V-only operation. |
Compared with AT28C64B-15PI, AT28C64X-15PI trades enhanced ECC and 10× endurance for lower cost and identical timing/package; versus MX28LV640E-15PI, it eliminates VPP dependency and adds robust write-inhibit logic, simplifying power design and improving field reliability.
Availability
AT28C64X-15PI is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, and automotive body electronics requiring stable component supply, long-lifecycle support, and guaranteed industrial temperature performance.
Supply support for AT28C64X-15PI 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.
The AT28C64X series was designed as a drop-in replacement for EPROM and early EEPROM solutions in 5 V microprocessor systems, emphasizing ease of integration, low-power operation, and industrial-grade reliability.
FAQ
What is the RDY/BUSY pin configuration on AT28C64X-15PI?
The RDY/BUSY pin (Pin 1) is unconnected (NC) on the AT28C64X-15PI per datasheet specification. Unlike the base AT28C64, this variant disables the open-drain READY/BUSY output, requiring use of DATA polling (I/O7 complement detection) to monitor write completion. This simplifies board routing but mandates firmware support for polling logic.
Does AT28C64X-15PI require a 12 V programming voltage?
No, AT28C64X-15PI operates entirely from a single 5 V ±10% supply. It does not require external 12 V (VPP) for write operations-unlike older EPROMs or some competing EEPROMs. Chip Clear and Device Identification functions do use 12 V on A9, but these are optional and infrequent procedures, not part of normal byte write cycles.
What is the endurance rating of AT28C64X-15PI?
AT28C64X-15PI is rated for 10,000 (10⁴) write/erase cycles per memory location. This endurance level is verified per JEDEC standards and is sufficient for applications involving periodic configuration updates, calibration storage, or infrequent firmware patching-not for high-frequency logging or buffer-style usage.
Can AT28C64X-15PI be used as a direct replacement for AT28C64-15PI?
Yes, AT28C64X-15PI is pin-compatible and electrically identical to AT28C64-15PI in all functional modes except RDY/BUSY pin behavior: Pin 1 is NC on AT28C64X-15PI but active READY/BUSY on AT28C64-15PI. If the host system does not rely on RDY/BUSY signaling, AT28C64X-15PI can replace AT28C64-15PI without PCB changes.
How is write protection implemented on AT28C64X-15PI?
AT28C64X-15PI uses three-tiered write protection: (1) VCC sense-writes disabled if supply drops below ~3.8 V; (2) Power-on delay-5 ms internal timeout after VCC stabilization before writes enabled; (3) Control-line inhibition-holding OE high, CE high, or WE high blocks all write attempts. These features prevent spurious writes during power transitions or noise events.
AT28C64X-15PI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 28-DIP (0.600", 15.24mm)
- 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:
- Through Hole
- Supplier Device Package:
- 28-PDIP
AT28C64X-15PI FAQ
1.How can I place an order for AT28C64X-15PI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT28C64X-15PI 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-15PI reliable?
The price and inventory of AT28C64X-15PI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT28C64X-15PI is usually 5 days.
3.What payment methods are accepted for AT28C64X-15PI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT28C64X-15PI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT28C64X-15PI?
AT28C64X-15PI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT28C64X-15PI 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-15PI?
For technical support, including AT28C64X-15PI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT28C64X-15PI requirements.
6.How does Aetrix verify that AT28C64X-15PI is sourced from the original manufacturer or authorized distributors?
All AT28C64X-15PI 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-15PI meets industry standards.
7.What is the process for return or replacement of AT28C64X-15PI?
All AT28C64X-15PI units undergo pre-shipment inspection (PSI). If there is an issue with AT28C64X-15PI, 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-15PI part is unused and in its original packaging.
Return procedure for AT28C64X-15PI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT28C64X-15PI Tags
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