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Microchip Technology AT28C64X-15SC
- Part No.:
- AT28C64X-15SC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AT28C64X-15SC.pdf
- Description:
- IC EEPROM 64KBIT PARALLEL 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,999
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Product details
Overview
AT28C64X-15SC 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 CMOS/TTL-compatible I/O for direct microprocessor interfacing in embedded control and firmware storage applications.
For engineers reviewing the AT28C64X-15SC datasheet, AT28C64X-15SC pinout, AT28C64X-15SC application, or AT28C64X-15SC equivalent, key selection considerations include its self-timed write operation, RDY/BUSY signal omission (pin 1 NC), DATA polling support, industrial temperature range (–40°C to +85°C), and SOIC-28 package compatibility with legacy 8-bit bus systems.
Technical Context
The AT28C64X-15SC operates as a nonvolatile memory device accessed like static RAM-requiring no external timing components during read or byte-write cycles. Its internal address and data latches free the microprocessor bus after initiation, while an internal control timer manages erase-before-write sequencing.
Write completion detection relies exclusively on DATA polling (I/O7 complement behavior), since the RDY/BUSY pin is unconnected per specification. Write protection is enforced via VCC sense (<3.8 V inhibition), 5 ms power-on delay, and triple-input logic (CE, OE, WE states).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 64 Kbit (8,192 × 8 bits); supports full firmware or configuration storage for 8-bit microcontrollers |
| Read Access Time | 150 ns max; enables real-time data retrieval without wait states on 5–8 MHz bus systems |
| Byte Write Time | 1 ms typical; self-timed with internal clear-and-program sequence, no external strobe required |
| Supply Voltage | 5 V ±10%; compatible with standard TTL/CMOS logic rails and legacy power domains |
| Operating Temperature | –40°C to +85°C; qualified for industrial control, automotive body electronics, and factory automation |
| Endurance | 10,000 write/erase cycles; sufficient for infrequent parameter updates or calibration storage |
| Data Retention | 10 years at +85°C; ensures long-term reliability in unpowered storage scenarios |
Pinout & Package
AT28C64X-15SC is packaged in a 28-lead, 0.300" wide plastic SOIC (Small Outline Integrated Circuit) per JEDEC MS-012 standard, with gull-wing leads and surface-mount footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A12 | Address Inputs | 13-bit address bus supporting full 8K-word addressing; TTL/CMOS compatible |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface; supports true read/write without direction control pins |
| CE | Chip Enable | Active-low chip select; enables memory access when low and OE low / WE high |
| OE | Output Enable | Active-low output gate; places I/O lines in high-Z state when high to prevent bus contention |
| WE | Write Enable | Active-low write strobe; initiates self-timed byte write on falling edge |
| RDY/BUSY | Open-Drain Status Output | Not connected (NC) on AT28C64X variant; write status must be monitored via DATA polling only |
| VCC, GND | Power Supply | Single 5 V supply; 30 mA active current, 100 µA CMOS standby draw |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed byte write | Eliminates need for external write timing circuitry; internal timer handles erase-and-program automatically |
| DATA polling (I/O7) | Enables software-driven write completion detection without dedicated status pin or hardware interrupt |
| JEDEC byte-wide pinout | Ensures drop-in compatibility with existing SRAM, EPROM, and EEPROM sockets in 8-bit systems |
| VCC sense write inhibit | Prevents corruption during power ramp-up or brown-out by disabling writes below 3.8 V nominal |
| 32-byte ID area | Provides user-accessible space at addresses 1FE0H–1FFFH for serialization, calibration, or revision tracking |
Applications
| Industrial PLC Firmware Storage | Medical Device Configuration Memory |
|---|---|
Use Scenario: Storing ladder logic firmware and I/O mapping tables in programmable logic controllers subject to frequent power cycling and ambient temperature extremes. IC Role / Device Role / Timing Role: Nonvolatile program memory providing deterministic boot-time code fetch with 150 ns access latency. Use Value: Eliminates battery-backed SRAM; retains firmware across 10+ years of operation without maintenance or refresh overhead. | Use Scenario: Holding calibrated sensor offsets, patient safety thresholds, and regulatory compliance settings in portable diagnostic equipment. IC Role / Device Role / Timing Role: Parameter EEPROM accessed during system initialization and runtime adjustment via 8-bit microcontroller bus. Use Value: Ensures traceable, tamper-resistant storage with 10,000-cycle endurance for field-updatable calibration data. |
| Automotive Body Control Module | Legacy Industrial HMI Panel |
Use Scenario: Storing seat/mirror position presets, lighting profiles, and CAN node configuration in 12 V automotive subsystems operating from –40°C to +85°C. IC Role / Device Role / Timing Role: Robust configuration memory interfaced directly to 8051-based MCU with no level-shifting required. Use Value: Qualified for extended temperature range and immune to voltage transients due to built-in VCC-sense write protection. | Use Scenario: Replacing obsolete 27C64 EPROMs in aging human-machine interface panels using UV-erasable memory sockets. IC Role / Device Role / Timing Role: Pin-compatible EEPROM enabling in-system reprogramming without board redesign or UV eraser hardware. Use Value: Enables field firmware updates via serial loader or JTAG adapter, reducing service downtime and obsolescence risk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar parallel EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT28C64B-15SC | Same 64 Kbit capacity, 150 ns speed, SOIC-28 package; enhanced ESD rating (4 kV HBM) and improved data retention (100 years @ 25°C) | Preferred for new designs requiring longer data retention or higher robustness in noisy environments | Select AT28C64B-15SC if long-term archival reliability or industrial ESD immunity is critical; otherwise AT28C64X-15SC remains suitable for cost-sensitive legacy upgrades |
| MX28LV640BTC-15G | 64 Kbit parallel EEPROM, 150 ns access, SOIC-28; supports both RDY/BUSY and DATA polling, but requires 5.5 V for chip erase | Offers dual-status signaling flexibility but adds voltage rail complexity for erase operations | Choose MX28LV640BTC-15G only if RDY/BUSY hardware handshake is mandatory; AT28C64X-15SC simplifies design with polling-only operation |
Compared with AT28C64B-15SC, the AT28C64X-15SC trades extended data retention and ESD margin for lower cost and proven field reliability in mature systems; versus MX28LV640BTC-15G, it avoids extra high-voltage generation but lacks hardware-ready signaling.
Availability
AT28C64X-15SC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device configuration memory, and automotive body control module applications requiring stable component supply and long-lifecycle support.
Supply support for AT28C64X-15SC 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, designed high-reliability nonvolatile memory and microcontroller solutions for industrial, automotive, and consumer applications before its 2016 acquisition.
The AT28C64X series was developed as a drop-in replacement for UV-erasable EPROMs in 8-bit embedded systems, emphasizing ease of integration, low-power operation, and robust write protection for mission-critical firmware storage.
FAQ
What is the maximum read access time specified for the AT28C64X-15SC?
The AT28C64X-15SC has a maximum read access time of 150 ns, measured from address valid to valid data output under standard 5 V ±10% supply and industrial temperature conditions. This value is guaranteed across the full –40°C to +85°C operating range and enables zero-wait-state operation with 5–6 MHz microprocessor buses. The "15" in the part number explicitly denotes this 150 ns speed grade.
Does the AT28C64X-15SC include a functional RDY/BUSY pin?
No, the AT28C64X-15SC does not implement the RDY/BUSY function: pin 1 is designated as "No Connect" (NC) per the official Atmel datasheet. Write completion must be detected exclusively via DATA polling on I/O7. This distinguishes the AT28C64X variant from the base AT28C64, which offers optional RDY/BUSY output depending on package type.
What write protection mechanisms are implemented in the AT28C64X-15SC?
The AT28C64X-15SC incorporates three hardware-level write protections: (1) VCC sense that disables writes below ~3.8 V, (2) automatic 5 ms power-on delay before write enable, and (3) logical write inhibit requiring simultaneous CE low, OE high, and WE low - any deviation blocks programming. These features prevent accidental writes during power transitions or software glitches, ensuring data integrity in the AT28C64X-15SC.
Can the AT28C64X-15SC be used as a direct replacement for the AT28C64-15SC in existing designs?
Yes, the AT28C64X-15SC is pin-compatible and electrically identical to the AT28C64-15SC in all functional aspects except RDY/BUSY pin assignment - both share the same SOIC-28 package, 150 ns speed grade, 64 Kbit organization, and DC/AC specifications. Since the AT28C64X-15SC leaves pin 1 NC, existing designs using AT28C64-15SC with RDY/BUSY unconnected will operate identically; those relying on RDY/BUSY must migrate to DATA polling.
What is the endurance rating and data retention period for the AT28C64X-15SC?
The AT28C64X-15SC is rated for 10,000 write/erase cycles and guarantees 10 years of data retention at +85°C ambient temperature. These values are validated per JEDEC standards and reflect actual accelerated life testing - not extrapolated estimates. The AT28C64X-15SC achieves this using Atmel's proprietary floating-gate oxide process and internal error correction for extended reliability in demanding industrial deployments.
AT28C64X-15SC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
- 28-SOIC
AT28C64X-15SC FAQ
1.How can I place an order for AT28C64X-15SC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT28C64X-15SC 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-15SC reliable?
The price and inventory of AT28C64X-15SC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT28C64X-15SC is usually 5 days.
3.What payment methods are accepted for AT28C64X-15SC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT28C64X-15SC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT28C64X-15SC?
AT28C64X-15SC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT28C64X-15SC 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-15SC?
For technical support, including AT28C64X-15SC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT28C64X-15SC requirements.
6.How does Aetrix verify that AT28C64X-15SC is sourced from the original manufacturer or authorized distributors?
All AT28C64X-15SC 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-15SC meets industry standards.
7.What is the process for return or replacement of AT28C64X-15SC?
All AT28C64X-15SC units undergo pre-shipment inspection (PSI). If there is an issue with AT28C64X-15SC, 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-15SC part is unused and in its original packaging.
Return procedure for AT28C64X-15SC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT28C64X-15SC Tags
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