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Microchip Technology AT28C64E-15PI
- Part No.:
- AT28C64E-15PI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
AT28C64E-15PI.pdf
- Description:
- IC EEPROM 64KBIT PARALLEL 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,096
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Product details
Overview
AT28C64E-15PI from Atmel is a 64 Kbit (8K × 8) parallel EEPROM with 150 ns read access time, 200 µs fast byte write cycle, and CMOS/TTL-compatible I/O. It operates at 5V ±10%, supports industrial temperature range (–40°C to +85°C), and features READY/BUSY output and DATA polling for microprocessor-controlled write completion detection - used in firmware storage and configuration retention for embedded controllers.
For engineers reviewing the AT28C64E-15PI datasheet, AT28C64E-15PI pinout, AT28C64E-15PI application, or AT28C64E-15PI equivalent, this page delivers verified electrical specs, JEDEC-standard byte-wide pin mapping, endurance and retention data, industrial-grade supply stability, and real-world use context for legacy system upgrades and field-programmable memory design.
Technical Context
The AT28C64E-15PI implements self-timed byte write with internal address/data latching and automatic clear-before-write logic, eliminating external timing circuitry. Its RDY/BUSY open-drain output and I/O7 data polling provide two independent, hardware-synchronized methods to detect write completion without bus contention.
It uses Atmel's nonvolatile EEPROM technology with built-in error correction for extended reliability, delivering 10⁵ write cycles and 10-year data retention. The device supports chip erase via 12 V on OE and includes 32 bytes of user-accessible identification memory at addresses 1FE0H–1FFFH.
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 in 8-bit microcontroller systems. |
| Read Access Time | 150 ns max - enables direct replacement of SRAM in legacy 5 MHz bus systems without wait-state insertion. |
| Byte Write Time | 200 µs max (AT28C64E variant) - reduces full-memory reprogramming time to ~1.6 seconds, critical for field firmware updates. |
| Endurance | 100,000 write/erase cycles - supports frequent parameter logging or dynamic configuration changes in industrial control applications. |
| Data Retention | 10 years at +85°C - ensures long-term reliability in unattended equipment such as remote sensors or power meters. |
| 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 industrial environments including factory automation and outdoor telemetry units. |
Pinout & Package
AT28C64E-15PI is supplied in a 28-pin plastic DIP (PDIP) package per JEDEC MS-011 AB, with 0.600" width and through-hole mounting. Pin 1 is RDY/BUSY (open-drain), and pins 1 and 17 are not connected in PLCC variants - but PDIP version uses all 28 pins as defined.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A12 | Address Inputs | 13-bit address bus supporting full 8K-word addressing; TTL/CMOS compatible thresholds ensure robust decoding in mixed-signal systems. |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface with high-impedance tri-state outputs during standby; supports direct connection to microprocessor data bus without buffers. |
| CE | Chip Enable | Active-low chip select; when high, places device in standby (<100 µA), enabling low-power multi-chip memory subsystems. |
| OE | Output Enable | Active-low read control; dual-line enable (with CE) prevents bus contention during partial decode or shared bus arbitration. |
| WE | Write Enable | Active-low write strobe; initiates self-timed byte write on falling edge, freeing CPU bus immediately after latch. |
| RDY/BUSY | Status Output | Open-drain signal pulled low during write; allows wired-OR connection across multiple EEPROMs for centralized status monitoring. |
| VCC, GND | Power Supply | Single 5 V supply with decoupling recommended near pin 28 (VCC) and pin 14 (GND) to maintain noise immunity during write transitions. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed byte write | Eliminates need for external write timing circuitry; internal control timer handles clear-and-write sequence automatically. |
| DATA Polling on I/O7 | Enables software-driven write completion detection without dedicated status lines - ideal for systems with limited GPIO. |
| WRITE PROTECTION logic | VCC sense (disable below 3.8 V), power-on delay (~5 ms), and triple-gate inhibit (CE/OE/WE states) prevent accidental writes during power transients. |
| JEDEC byte-wide pinout | Ensures drop-in compatibility with industry-standard 28-pin parallel EEPROM sockets and legacy PCB layouts. |
| User identification memory | 32-byte reserved area (1FE0H–1FFFH) accessible via 12 V on A9 - supports device serialization, calibration traceability, or firmware version tagging. |
Applications
| Industrial PLC Configuration Storage | Legacy BIOS/Bootloader Memory |
|---|---|
Use Scenario: Storing I/O mapping tables, PID tuning parameters, and alarm thresholds in programmable logic controllers deployed in factory environments. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed during power-up and runtime via 8-bit parallel bus; RDY/BUSY synchronizes parameter updates without halting main control loop. Use Value: 100,000-cycle endurance supports daily recalibration; 10-year retention eliminates battery-backed SRAM maintenance in sealed enclosures. |
Use Scenario: Holding boot code and hardware initialization routines in x86-based industrial PCs and single-board computers where flash BIOS is unavailable or obsolete. IC Role / Device Role / Timing Role: Static RAM-compatible read interface (150 ns) allows direct substitution into existing ISA bus designs; WE-controlled write enables safe field updates via diagnostic utilities. Use Value: JEDEC pinout and 5 V operation ensure plug compatibility with decades-old motherboard layouts; DATA polling avoids adding external ready logic. |
| Medical Device Calibration Data | Point-of-Sale Terminal Settings |
Use Scenario: Retaining sensor calibration coefficients and usage logs in portable diagnostic instruments subject to frequent power cycling and regulatory audit requirements. IC Role / Device Role / Timing Role: Secure, tamper-resistant nonvolatile memory with write protection; chip erase (12 V on OE) enables full reset before device redeployment. Use Value: VCC-sense and 5 ms power-on delay prevent corruption during brown-out conditions common in battery-operated devices. |
Use Scenario: Preserving tax rate tables, receipt formatting rules, and operator permissions in retail terminals operating 24/7 in varying ambient temperatures. IC Role / Device Role / Timing Role: Industrial-temperature-rated EEPROM interfaced to 8051 or Z80 derivatives; RDY/BUSY line shared across multiple peripherals for coordinated firmware patching. Use Value: –40°C to +85°C rating guarantees reliable operation in uncontrolled retail environments; 200 µs write time minimizes transaction interruption during settings update. |
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 | Slower 1 ms byte write; 10⁴ endurance; same pinout, voltage, and timing except tWC. | Lower-cost option where infrequent updates suffice; unsuitable for high-frequency logging or rapid field updates. | Select AT28C64B-15PI only if write speed and endurance requirements are relaxed - verify full memory rewrite time (8.2 sec vs. 1.6 sec). |
| MX28LV640E-15PC | Same 64 Kbit, 150 ns, 200 µs write, but uses 3.3 V core with 5 V tolerant I/O; different pinout (no RDY/BUSY). | Requires level-shifting in pure 5 V systems; lacks hardware busy signaling - relies solely on DATA polling. | Choose MX28LV640E-15PC only in mixed-voltage designs with available GPIO for polling; avoid if RDY/BUSY line sharing is required. |
Compared with AT28C64B-15PI, the AT28C64E-15PI delivers 5× faster writes and 10× higher endurance - critical for dynamic configuration. Against MX28LV640E-15PC, it offers native 5 V operation and hardware-ready signaling but lacks 3.3 V compatibility - making it the preferred choice for legacy 5 V industrial systems requiring deterministic write synchronization.
Availability
AT28C64E-15PI is available at Aetrix Electronics and suitable for industrial PLCs, legacy BIOS modules, and medical calibration systems requiring stable component supply, long-lifecycle support, and drop-in compatibility with existing 28-pin parallel EEPROM footprints.
Supply support for AT28C64E-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 semiconductor manufacturer specializing in microcontrollers, nonvolatile memory, and secure authentication ICs for industrial, automotive, and consumer applications.
The AT28C64 series was designed as a direct, pin-compatible EEPROM replacement for battery-backed SRAM in 8-bit embedded systems - emphasizing ease of integration, industrial temperature resilience, and microprocessor-native timing behavior.
FAQ
What is the maximum write endurance specification for AT28C64E-15PI?
The AT28C64E-15PI is rated for 100,000 write/erase cycles - confirmed in the "Features" section and ordering information table, where the "E" suffix explicitly denotes the high-endurance variant versus the standard 10,000-cycle AT28C64B. This endurance level supports daily parameter updates over a 27-year operational life under worst-case conditions.
Does AT28C64E-15PI support both hardware and software write completion detection?
Yes, AT28C64E-15PI supports dual write completion detection: hardware via the open-drain RDY/BUSY pin (pin 1), which goes low during write and releases at completion; and software via DATA polling on I/O7, where the complement of written data appears until the operation finishes. Both methods are fully documented in the Device Operation section.
What is the function of the 12 V signal on OE and A9 pins for AT28C64E-15PI?
Applying 12.0 V ± 0.5 V to OE performs Chip Erase - clearing the entire memory array to FFH. Applying the same voltage to A9 enables access to the 32-byte device identification memory at addresses 1FE0H–1FFFH. These functions are electrically isolated from normal 5 V operation and require explicit high-voltage programming circuitry.
Is AT28C64E-15PI pin-compatible with older AT28C64-15PI variants?
Yes, AT28C64E-15PI maintains identical pinout, voltage levels, timing specifications (tACC = 150 ns), and functional behavior with non-E variants - differing only in write speed (200 µs vs. 1 ms) and endurance (10⁵ vs. 10⁴ cycles). JEDEC byte-wide pinout compliance ensures mechanical and electrical drop-in replacement in existing PDIP sockets.
What power supply conditions trigger write inhibition on AT28C64E-15PI?
AT28C64E-15PI inhibits writes under three conditions: (1) VCC < 3.8 V (typical), detected by internal VCC sense; (2) within 5 ms (typical) after VCC rises above 3.8 V, enforced by internal power-on delay; and (3) if any of CE (high), OE (low), or WE (high) violates active-write logic states - all documented in the WRITE PROTECTION section.
AT28C64E-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:
- 200µs
- 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
AT28C64E-15PI FAQ
1.How can I place an order for AT28C64E-15PI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT28C64E-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 AT28C64E-15PI reliable?
The price and inventory of AT28C64E-15PI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT28C64E-15PI is usually 5 days.
3.What payment methods are accepted for AT28C64E-15PI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT28C64E-15PI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT28C64E-15PI?
AT28C64E-15PI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT28C64E-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 AT28C64E-15PI?
For technical support, including AT28C64E-15PI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT28C64E-15PI requirements.
6.How does Aetrix verify that AT28C64E-15PI is sourced from the original manufacturer or authorized distributors?
All AT28C64E-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 AT28C64E-15PI meets industry standards.
7.What is the process for return or replacement of AT28C64E-15PI?
All AT28C64E-15PI units undergo pre-shipment inspection (PSI). If there is an issue with AT28C64E-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 AT28C64E-15PI part is unused and in its original packaging.
Return procedure for AT28C64E-15PI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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