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Microchip Technology AT28C64-15PC
- Part No.:
- AT28C64-15PC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
AT28C64-15PC.pdf
- Description:
- IC EEPROM 64KBIT PARALLEL 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,044
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Product details
Overview
AT28C64-15PC from Atmel is a 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 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 embedded system configuration storage and firmware parameter retention.
For engineers reviewing the AT28C64-15PC datasheet, AT28C64-15PC pinout, AT28C64-15PC application, or AT28C64-15PC equivalent, key selection considerations include its JEDEC-standard 28-pin PDIP package, 1 ms standard write time, 10⁴ endurance cycles, 10-year data retention, and direct microprocessor interface without external timing components.
Technical Context
The AT28C64-15PC implements a parallel nonvolatile memory architecture with internal address/data latching and an integrated control timer that autonomously manages erase-before-write sequences. Its RDY/BUSY open-drain output and I/O7 data polling provide two hardware-level write completion signaling methods.
It uses Atmel's proprietary nonvolatile technology with built-in error correction for enhanced data retention and endurance. The device includes VCC sense, power-on delay, and input-level write inhibition to prevent inadvertent writes - all operating within a single 5V supply without auxiliary voltages except for optional chip erase (12V on OE) and device ID access (12V on A9).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 64 Kbit (8,192 × 8 bits); sufficient for boot code storage or calibration tables in 8-bit microcontroller systems |
| Read Access Time | 150 ns max; enables direct replacement of SRAM in legacy 5 MHz bus systems without wait states |
| Byte Write Time | 1 ms typical (standard version); self-timed operation frees CPU bus during programming |
| Endurance | 10,000 write/erase cycles; validated for field-updatable configuration data in industrial controllers |
| Data Retention | 10 years at 25°C; guaranteed retention under commercial temperature conditions without refresh |
| Supply Voltage | 5V ±10%; compatible with legacy TTL/CMOS logic families and unregulated 5V rails |
| Standby Current | 100 µA (CMOS mode); enables low-power hold state in battery-backed applications |
Pinout & Package
AT28C64-15PC is packaged in a 28-lead, 0.600" wide plastic DIP (PDIP) per JEDEC MS-011 AB, with pin 1 designated as RDY/BUSY (open-drain) and pins 1–28 arranged in dual in-line configuration. Pin 17 is NC (no connect); pin 28 is VCC; pin 14 is GND.
| 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; outputs drive 2.1 mA low, inputs accept TTL/CMOS logic levels |
| 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; enables data output only when CE is also low |
| WE | Write Enable | Active-low write strobe; initiates self-timed byte write on falling edge |
| RDY/BUSY | Status Output | Open-drain signal pulled low during write; allows wired-OR connection of multiple devices |
| VCC, GND | Power Supply | Single 5V supply; decoupling required within 1 inch of VCC pin per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed byte write | Eliminates need for external write timing circuitry; internal timer handles erase-and-program sequence automatically |
| DATA polling via I/O7 | Enables software-driven write completion detection without dedicated status lines or interrupts |
| READY/BUSY open-drain output | Supports hardware handshaking and multi-device synchronization on shared memory buses |
| VCC write protection | Prevents spurious writes during power ramp-up or brown-out by disabling WE until VCC ≥ 3.8V |
| JEDEC-standard pinout | Ensures drop-in compatibility with existing 28-pin EPROM/EEPROM sockets and PCB footprints |
Applications
| Industrial PLC Configuration Storage | Legacy PC BIOS Parameter Retention |
|---|---|
Use Scenario: Storing 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 register bank accessed via 8-bit parallel bus during system initialization and runtime updates. Use Value: Enables field reconfiguration without firmware reload; 10⁴ endurance supports weekly parameter updates over 5+ years. |
Use Scenario: Holding CMOS setup values (date/time, boot order, peripheral enables) in ISA-bus-based PCs and embedded x86 systems. IC Role / Device Role / Timing Role: Direct replacement for 28C64 EPROMs in legacy BIOS designs, interfacing with Intel 80286/386 address/data buses. Use Value: 150 ns read speed meets original design timing; 5V-only operation avoids need for 12V programming supplies. |
| Point-of-Sale Terminal Firmware Patching | Medical Device Calibration Data Storage |
Use Scenario: Storing hotfix patches and localized language strings in retail terminals where firmware updates occur infrequently but must survive power loss. IC Role / Device Role / Timing Role: Parallel-accessed code/data partition mapped into microcontroller memory space using standard address decoding. Use Value: Self-timed writes allow safe in-field updates without custom timing logic; 10-year retention ensures data integrity across product lifecycle. |
Use Scenario: Archiving sensor calibration coefficients and usage logs in portable diagnostic equipment requiring regulatory-compliant data persistence. IC Role / Device Role / Timing Role: Secure, tamper-resistant nonvolatile storage accessed only during service mode via dedicated MCU interface. Use Value: VCC-sense write protection prevents corruption during battery swaps; 100 µA standby current extends battery life in idle state. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar parallel EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT28C64B-15PC | Revised revision with improved data retention (10 years @ 85°C vs. 10 years @ 25°C) and tighter tACC tolerance (150 ns max vs. 150 ns typ) | Preferred for extended-temperature industrial deployments where long-term reliability at elevated ambient is critical | Select AT28C64B-15PC if operating above 70°C or requiring updated qualification data; otherwise AT28C64-15PC remains fully functional |
| MX28C64PC-15 | Macronix second-source part with identical pinout, AC/DC specs, and 1 ms write time; same 10⁴ endurance and 5V supply | Drop-in alternative for supply chain diversification; validated for use in existing AT28C64-15PC designs | Use MX28C64PC-15 where dual-sourcing is mandated; no layout or firmware changes required |
Compared with AT28C64-15PC, the AT28C64B-15PC offers higher temperature-rated data retention while maintaining full electrical and mechanical compatibility, whereas MX28C64PC-15 provides verified second-source assurance without any design adaptation.
Availability
AT28C64-15PC is available at Aetrix Electronics and suitable for industrial PLC configuration storage, legacy PC BIOS parameter retention, and medical device calibration data storage requiring stable component supply across extended production lifecycles.
Supply support for AT28C64-15PC 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 AT28C64 series was designed as a pin-compatible, 5V-only upgrade path from UV-erasable EPROMs, targeting cost-sensitive embedded systems needing field-updatable nonvolatile storage without high-voltage programming.
FAQ
What is the maximum read access time specified for the AT28C64-15PC?
The AT28C64-15PC has a maximum read access time (tACC) of 150 ns under commercial temperature conditions (0°C to 70°C) and 5V ±10% supply. This value is guaranteed across the full operating range and enables direct substitution for 150 ns SRAM or EPROM in legacy 8-bit systems without timing adjustments. The AT28C64-15PC achieves this performance using Atmel's optimized CMOS EEPROM process.
Does the AT28C64-15PC require a 12V programming voltage?
No, the AT28C64-15PC operates entirely from a single 5V supply for normal read and write operations. A 12V voltage is only required for optional functions: chip erase (applied to OE pin) and accessing the 32-byte device identification area (applied to A9 pin). These are infrequent service-mode operations and do not affect standard AT28C64-15PC usage in embedded applications.
How does write protection work on the AT28C64-15PC?
The AT28C64-15PC implements three-tiered write protection: (1) VCC sense disables writes if supply drops below ~3.8V; (2) a 5 ms internal power-on delay prevents writes during startup; and (3) standard logic-level inhibition - holding CE high, OE low, or WE high blocks all byte writes. These mechanisms ensure robust immunity to noise-induced or brown-out corruption during AT28C64-15PC operation.
Can the AT28C64-15PC be used in place of a standard EPROM like the 27C64?
Yes, the AT28C64-15PC uses a JEDEC-approved byte-wide pinout identical to the 27C64 EPROM, allowing socket-level replacement in many designs. However, unlike UV-erasable EPROMs, the AT28C64-15PC supports in-system electrical erasure and reprogramming without removing the device. Its 150 ns access time and 5V-only operation make the AT28C64-15PC a drop-in upgrade for 27C64-based systems requiring field updates.
What is the endurance rating of the AT28C64-15PC?
The AT28C64-15PC is rated for 10,000 write/erase cycles per memory location, verified per JEDEC standards. This endurance level supports applications such as industrial controller configuration updates, medical device calibration logging, and POS terminal firmware patching where writes occur infrequently but must remain reliable over multi-year deployments. The AT28C64-15PC maintains this specification across its full commercial temperature range.
AT28C64-15PC 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:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 28-PDIP
AT28C64-15PC FAQ
1.How can I place an order for AT28C64-15PC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT28C64-15PC 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 AT28C64-15PC reliable?
The price and inventory of AT28C64-15PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT28C64-15PC is usually 5 days.
3.What payment methods are accepted for AT28C64-15PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT28C64-15PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT28C64-15PC?
AT28C64-15PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT28C64-15PC 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 AT28C64-15PC?
For technical support, including AT28C64-15PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT28C64-15PC requirements.
6.How does Aetrix verify that AT28C64-15PC is sourced from the original manufacturer or authorized distributors?
All AT28C64-15PC 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 AT28C64-15PC meets industry standards.
7.What is the process for return or replacement of AT28C64-15PC?
All AT28C64-15PC units undergo pre-shipment inspection (PSI). If there is an issue with AT28C64-15PC, 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 AT28C64-15PC part is unused and in its original packaging.
Return procedure for AT28C64-15PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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