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Microchip Technology AT28C64E-15SC
- Part No.:
- AT28C64E-15SC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AT28C64E-15SC.pdf
- Description:
- IC EEPROM 64KBIT PARALLEL 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,331
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Product details
Overview
AT28C64E-15SC from Atmel is a 64 Kbit (8K × 8) parallel EEPROM with JEDEC-standard byte-wide pinout, 150 ns read access time, 200 µs fast byte write cycle, and CMOS/TTL-compatible I/O. It operates at 5V ±10%, supports commercial temperature range (0°C to 70°C), and delivers 30 mA active current and 100 µA standby current for embedded microcontroller systems requiring nonvolatile configuration storage.
For engineers reviewing the AT28C64E-15SC datasheet, AT28C64E-15SC pinout, AT28C64E-15SC application, or AT28C64E-15SC equivalent, key selection criteria include verified fast write timing (200 µs), RDY/BUSY open-drain signaling, DATA polling support, self-timed write with internal latching, and industrial-grade reliability (100,000 write cycles, 10-year data retention).
Technical Context
The AT28C64E-15SC functions as a drop-in SRAM-compatible nonvolatile memory: reads occur with CE and OE low and WE high; writes initiate on falling WE (or CE) edge with address/data latched internally, enabling bus release during self-timed erase-and-write. Its architecture includes VCC sense, power-on delay, and input-level write inhibit for robust inadvertent-write protection.
Two hardware-based write completion detection methods are implemented: level-sensitive RDY/BUSY output (open-drain, pin 1) and DATA polling via I/O7 complement behavior. The device integrates internal error correction for enhanced endurance and includes 32 bytes of dedicated identification EEPROM accessible at 1FE0H–1FFFH using A9 = 12 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 64 Kbit (8,192 × 8 bits); provides full byte-addressable nonvolatile storage without external address decoding logic. |
| Read Access Time | 150 ns maximum; enables direct interface with 6–8 MHz microcontrollers without wait states. |
| Byte Write Time | 200 µs maximum (AT28C64E variant); reduces full-memory rewrite to ≤1.6 seconds versus 1 ms in standard version. |
| Endurance | 100,000 write/erase cycles; validated for long-term field deployment in firmware update or calibration storage applications. |
| Data Retention | 10 years at 25°C; ensures persistent storage integrity across product lifecycle without refresh. |
| Supply Voltage | 5V ±10%; compatible with legacy 5V logic families and mixed-voltage system rails. |
| Operating Temperature | 0°C to 70°C (Commercial); suitable for office, consumer, and industrial control environments with passive thermal management. |
Pinout & Package
AT28C64E-15SC is packaged in a 28-lead SOIC (Small Outline Integrated Circuit), 0.300" wide, JEDEC MS-012 compliant, with 1.27 mm lead pitch and surface-mount gull-wing terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A12 | Address Inputs | 13-bit address bus supporting full 8K-word addressing; TTL/CMOS compatible thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V). |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel data path; supports true read/write operation with high-impedance tri-state outputs when CE or OE is high. |
| CE | Chip Enable | Active-low chip select; enables memory access only when low; used with OE/WE to prevent bus contention. |
| OE | Output Enable | Active-low output control; places I/O lines in high-Z state when high, allowing shared bus operation. |
| WE | Write Enable | Active-low write strobe; initiates self-timed byte write on falling edge; latches address and data internally. |
| RDY/BUSY | Open-Drain Status Output | Actively pulled low during write; released high-Z at completion; supports wired-OR multi-device status monitoring. |
| VCC | Power Supply | +5V ±10% supply input; powers core logic and memory array; includes VCC sense circuitry for write inhibition below 3.8 V. |
| GND | Ground Reference | Signal and power ground return; required for stable DC bias and noise margin compliance. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed byte write | Eliminates external timing circuitry; internal control timer manages erase-before-write sequence automatically. |
| RDY/BUSY + DATA polling | Dual asynchronous write completion detection enables flexible host software or hardware handshake strategies. |
| Write protection logic | VCC sense, 5 ms power-on delay, and triple-input inhibit (CE high / OE low / WE high) prevent spurious writes. |
| JEDEC byte-wide pinout | Ensures PCB layout compatibility with legacy SRAM and EPROM sockets, reducing redesign effort. |
| 32-byte ID memory | User-accessible EEPROM block at 1FE0H–1FFFH (A9 = 12 V) for serialization, calibration data, or firmware version tracking. |
Applications
| Industrial PLC Configuration Storage | Legacy Microcontroller Bootloader Parameters |
|---|---|
Use Scenario: Storing I/O mapping tables, PID tuning constants, and alarm thresholds in programmable logic controllers with no battery backup. IC Role / Device Role / Timing Role: Nonvolatile parameter memory accessed during power-up initialization and runtime reconfiguration. Use Value: 100,000-cycle endurance and 10-year retention ensure reliable operation over 10+ years of unattended industrial use. |
Use Scenario: Holding bootloader jump vectors, secure boot keys, and factory-calibrated ADC offsets in 8-bit MCUs like 8051 or PIC18. IC Role / Device Role / Timing Role: Parallel-configurable firmware auxiliary memory mapped into MCU address space alongside ROM/Flash. Use Value: 150 ns read access allows zero-wait-state execution of critical startup routines; 200 µs write enables rapid field updates. |
| Point-of-Sale Terminal Settings | Medical Device Calibration Data |
Use Scenario: Preserving tax rate tables, receipt formatting rules, and user preferences across power cycles in retail terminals. IC Role / Device Role / Timing Role: Byte-addressable configuration store interfaced directly to Z80 or 68K-family processors. Use Value: JEDEC pinout enables drop-in replacement of obsolete 27C64 EPROMs; RDY/BUSY signaling simplifies interrupt-driven write handling. |
Use Scenario: Archiving sensor offset/gain coefficients and regulatory compliance logs in portable diagnostic equipment. IC Role / Device Role / Timing Role: Tamper-resistant, nonvolatile calibration memory accessed during pre-use self-test sequences. Use Value: VCC-sense write protection prevents corruption during brown-out conditions; 5V operation aligns with isolated medical power supplies. |
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 | Standard endurance (10K cycles), 1 ms write time; identical pinout, timing, and voltage specs. | Limited to infrequent configuration updates; unsuitable for high-frequency calibration logging. | Select when cost sensitivity outweighs write-cycle longevity and speed requirements. |
| FM24C64-SO | I²C interface (not parallel), 400 kHz max clock, 5 ms write time per byte; 5V tolerant but not 5V native. | Requires MCU I²C peripheral and software driver; incompatible with SRAM-style bus interfacing. | Choose only if board layout lacks parallel bus resources or system already uses I²C for other peripherals. |
Compared with AT28C64B-15SC, the AT28C64E-15SC delivers 10× higher endurance and 5× faster writes-critical for dynamic calibration storage-while FM24C64-SO trades parallel simplicity for serial footprint savings but introduces protocol overhead and slower writes.
Availability
AT28C64E-15SC is available at Aetrix Electronics and suitable for industrial control systems, legacy microcontroller upgrades, and medical device calibration storage requiring stable component supply, long-lifecycle availability, and guaranteed 5V-compatible nonvolatile memory performance.
Supply support for AT28C64E-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) is a semiconductor manufacturer specializing in microcontrollers, nonvolatile memory, and secure authentication ICs for embedded and industrial applications.
The AT28C64 family was designed as a pin-compatible, SRAM-transparent upgrade path from UV-erasable EPROMs and battery-backed SRAMs-delivering true nonvolatility with zero external components in 5V systems.
FAQ
What is the maximum write speed of the AT28C64E-15SC?
The AT28C64E-15SC supports a maximum byte write time of 200 µs, enabled by its high-endurance "E" variant architecture. This is confirmed in the AC Write Characteristics table where tWC = 200 µs for AT28C64E devices. The standard AT28C64 requires 1 ms per byte. This speed allows full 64 Kbit rewrite in under 1.6 seconds, making AT28C64E-15SC suitable for applications requiring frequent field updates without system downtime.
Does the AT28C64E-15SC require external high-voltage programming?
No, the AT28C64E-15SC performs all write and erase operations using only a single 5V ±10% supply-no external 12 V or 21 V programming voltage is needed during normal byte writes. High voltage (12 V ±0.5 V on A9) is required only for accessing the 32-byte device identification area (1FE0H–1FFFH) or executing CHIP CLEAR, both of which are infrequent maintenance functions-not part of routine AT28C64E-15SC operation.
How does write protection work on the AT28C64E-15SC?
The AT28C64E-15SC implements three independent hardware write protection mechanisms: (1) VCC sense circuitry inhibits writes if supply drops below ~3.8 V; (2) a built-in 5 ms power-on delay prevents writes until VCC stabilizes; and (3) write is disabled if any of CE is high, OE is low, or WE is high. These features ensure AT28C64E-15SC remains immune to spurious writes during power transients or software glitches.
Can the AT28C64E-15SC be used as a direct replacement for standard SRAM in existing designs?
Yes-the AT28C64E-15SC uses JEDEC-approved byte-wide pinout and behaves electrically like a static RAM during reads and writes: CE/OE/WE control signals match standard SRAM timing, and I/O pins are fully TTL/CMOS compatible. However, write cycles take finite time (200 µs), so host firmware must poll RDY/BUSY or I/O7 to detect completion before initiating subsequent accesses-unlike volatile SRAM.
What package type is used for the AT28C64E-15SC?
The AT28C64E-15SC is supplied in a 28-lead Small Outline Integrated Circuit (SOIC) package, 0.300" wide, with gull-wing leads and JEDEC MS-012 compliance. Pin 1 is RDY/BUSY (open-drain), and the package supports surface-mount reflow assembly. This matches the "SC" suffix in the part number and is distinct from PDIP ("PC"), TSOP ("TC"), or PLCC ("JC") variants.
AT28C64E-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:
- 200µs
- 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
AT28C64E-15SC FAQ
1.How can I place an order for AT28C64E-15SC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT28C64E-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 AT28C64E-15SC reliable?
The price and inventory of AT28C64E-15SC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT28C64E-15SC is usually 5 days.
3.What payment methods are accepted for AT28C64E-15SC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT28C64E-15SC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT28C64E-15SC?
AT28C64E-15SC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT28C64E-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 AT28C64E-15SC?
For technical support, including AT28C64E-15SC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT28C64E-15SC requirements.
6.How does Aetrix verify that AT28C64E-15SC is sourced from the original manufacturer or authorized distributors?
All AT28C64E-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 AT28C64E-15SC meets industry standards.
7.What is the process for return or replacement of AT28C64E-15SC?
All AT28C64E-15SC units undergo pre-shipment inspection (PSI). If there is an issue with AT28C64E-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 AT28C64E-15SC part is unused and in its original packaging.
Return procedure for AT28C64E-15SC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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