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Microchip Technology AT28C64B-15PC
- Part No.:
- AT28C64B-15PC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
AT28C64B-15PC.pdf
- Description:
- IC EEPROM 64KBIT PARALLEL 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,936
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Product details
Overview
AT28C64B-15PC from Atmel is a 64 Kbit (8K × 8) parallel EEPROM with JEDEC-standard byte-wide pinout, 150 ns read access time, single 5 V ±10% supply, and hardware/software data protection-used in industrial control firmware storage and embedded configuration memory.
For engineers reviewing the AT28C64B-15PC datasheet, AT28C64B-15PC pinout, AT28C64B-15PC application, or AT28C64B-15PC equivalent, key selection considerations include page write timing (10 ms max), CMOS standby current (100 µA), DATA polling/Toggle Bit write completion detection, and JEDEC-compliant 28-pin PDIP package compatibility.
Technical Context
The AT28C64B-15PC implements a parallel EEPROM architecture with internal 64-byte page latching, enabling up to 64-byte writes in a single internal programming cycle. It uses CMOS nonvolatile technology with VCC sense and noise-filtered WE/CE inputs for hardware write inhibition.
Write completion is verified via DATA polling on I/O7 (complement-to-data during write) or Toggle Bit behavior on I/O6. Software Data Protection (SDP) is implemented via three-step command sequences at addresses 1555H/0AAAH/1555H, and remains active across power cycles unless explicitly disabled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 64 Kbit (8,192 × 8 bits); supports full byte-addressable nonvolatile storage without external refresh. |
| Read Access Time | 150 ns maximum; enables direct replacement of SRAM in legacy 8-bit bus systems with no wait-state insertion. |
| Page Write Cycle Time | 10 ms maximum (standard); allows efficient bulk configuration updates while freeing address/data bus after initial latch. |
| VCC Supply | 5 V ±10%; compatible with TTL/CMOS logic families and eliminates need for dual-supply design. |
| Standby Current | 100 µA (CMOS mode); reduces system-level power consumption during idle periods in battery-backed or energy-sensitive applications. |
| Endurance & Retention | 100,000 write/erase cycles; 10-year data retention at 85°C-validated for long-life industrial deployment. |
| Operating Temperature | -40°C to +85°C (industrial grade); qualified for use in programmable logic controllers and motor drive firmware storage. |
Pinout & Package
AT28C64B-15PC is supplied in a 28-lead, 0.600" wide plastic dual inline package (PDIP), per JEDEC MS-011 AB. Pin 1 is index-marked; pins 1 and 28 are VCC and GND respectively. NC pins (1, 27) must remain unconnected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A12 | Address Inputs | 13-bit address bus supporting full 8K-word addressing; A6–A12 define page boundaries for 64-byte page writes. |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface; I/O7 used for DATA polling, I/O6 for Toggle Bit detection during write cycles. |
| CE | Chip Enable | Active-low chip select; when high, forces outputs to high-impedance and inhibits all writes regardless of OE/WE state. |
| OE | Output Enable | Active-low read control; must be low with CE low and WE high to assert data on I/O lines; enables bus contention management. |
| WE | Write Enable | Active-low write strobe; falling edge latches address/data; combined with CE/OE logic defines byte vs. page write initiation. |
| GND / VCC | Power Terminals | Pins 14 (GND) and 28 (VCC); decoupling capacitor (0.1 µF) required within 1 cm of VCC/GND for stable write operation. |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC Byte-wide Pinout | Direct drop-in replacement for industry-standard 28-pin EPROMs and SRAMs in existing PCB layouts. |
| 64-byte Page Write | Reduces firmware update time by up to 64× versus byte-by-byte writes; internal latching frees bus for concurrent operations. |
| Hardware Write Inhibit | VCC sense (<3.8 V), 5 ms power-on delay, and 15 ns noise filtering prevent spurious writes during brown-out or EMI events. |
| DATA Polling & Toggle Bit | Real-time, bus-compatible write completion signaling without requiring external timers or status registers. |
| Software Data Protection (SDP) | User-configurable lock/unlock via 3-byte command sequence; persists across power cycles and prevents accidental overwrites. |
Applications
| Industrial PLC Configuration Storage | Legacy Embedded System Boot Code |
|---|---|
Use Scenario: Storing ladder logic parameters and I/O mapping tables in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed via 8-bit parallel bus during power-up and runtime reconfiguration. Use Value: 100,000-cycle endurance and -40°C to +85°C rating ensure reliable parameter retention over 10+ years of continuous operation. |
Use Scenario: Holding boot firmware and calibration constants in 1990s-era microcontroller-based instrumentation with no flash memory. IC Role / Device Role / Timing Role: Pin-compatible EEPROM replacement for obsolete 27C64 EPROMs, eliminating UV-erasure requirement. Use Value: 150 ns read access matches original SRAM timing budgets; software data protection prevents field corruption during power glitches. |
| Motor Drive Parameter Backup | Medical Device Calibration Memory |
Use Scenario: Saving torque curves, PID coefficients, and safety thresholds in variable-frequency drives subject to frequent power cycling. IC Role / Device Role / Timing Role: Standalone parallel EEPROM interfaced to 8051-family MCU via dedicated address/data bus. Use Value: 100 µA CMOS standby current minimizes auxiliary supply load; page write reduces recalibration time after service events. |
Use Scenario: Storing sensor offset/gain values and regulatory audit logs in Class II medical analyzers requiring traceable calibration history. IC Role / Device Role / Timing Role: Secure nonvolatile memory with SDP enabled to prevent unauthorized parameter modification. Use Value: Extra 64-byte ID sector (accessible at 1FC0H–1FFFH with A9 = 12 V) stores device serial number and calibration timestamp. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar parallel EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ST M28C64C-150K1 | Same 64K × 8 organization, 150 ns access, but requires 5 V ±5% supply and lacks software data protection. | No SDP command sequence; relies solely on hardware write inhibit-less robust in noisy power environments. | Preferred where strict 5 V regulation exists and simplified firmware is prioritized over field-write security. |
| Microchip 28C64B-15/P | Identical pinout and AC/DC specs, but rated only for commercial temperature (0°C to 70°C) and offers no 12 V ID sector. | Not qualified for industrial ambient conditions; unsuitable for outdoor or enclosed thermal environments. | Select only for cost-sensitive consumer-grade designs with controlled thermal profiles and no extended ID requirements. |
Compared with ST M28C64C-150K1 and Microchip 28C64B-15/P, the AT28C64B-15PC uniquely combines industrial temperature range, software data protection, and user-accessible device identification memory-making it the sole option for ruggedized, secure, and traceable embedded storage.
Availability
AT28C64B-15PC is available at Aetrix Electronics and suitable for industrial PLC configuration storage, legacy embedded system boot code, and motor drive parameter backup requiring stable component supply across extended product lifecycles.
Supply support for AT28C64B-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 AT28C64B belongs to Atmel's parallel EEPROM product line, designed specifically for pin-compatible migration from EPROM/SRAM in legacy 8-bit systems requiring field-upgradable, low-power, and highly reliable nonvolatile storage.
FAQ
What is the maximum page write cycle time for the AT28C64B-15PC?
The AT28C64B-15PC has a maximum standard page write cycle time of 10 ms. An optional 2 ms version is available under different ordering codes (e.g., AT28C64B-15PC with special marking), but the AT28C64B-15PC itself is rated at 10 ms. This timing is internally controlled and does not require external clocking or timing circuitry.
How does DATA polling work on the AT28C64B-15PC?
During a write cycle, reading the last written byte from the AT28C64B-15PC returns the complement of that data on I/O7. Once the write completes, true data appears on all I/O lines-including I/O7-and subsequent reads return valid stored values. This allows real-time, bus-synchronous verification without halting the host processor.
Can the AT28C64B-15PC be used as a direct replacement for a 27C64 EPROM?
Yes-the AT28C64B-15PC uses the same JEDEC-standard 28-pin byte-wide pinout as the 27C64 EPROM and operates with identical read timing (150 ns). Unlike EPROMs, it requires no UV erasure and supports in-system reprogramming, making it a functional and layout-compatible upgrade path.
What is the purpose of the extra 64 bytes of EEPROM in the AT28C64B-15PC?
The AT28C64B-15PC includes an additional 64-byte sector (addresses 1FC0H–1FFFH) accessible by raising A9 to 12 V ±0.5 V. This area is intended for device-specific data such as serial numbers, calibration timestamps, or manufacturing lot codes-enabling traceability without consuming main array space.
Does the AT28C64B-15PC support both commercial and industrial temperature ranges?
Yes-the AT28C64B-15PC is specified for industrial temperature operation (-40°C to +85°C), as confirmed by its "PI" and "PC" suffix variants in the ordering table. The "PC" suffix denotes the 28-pin PDIP package in the industrial temperature grade, distinguishing it from commercial-only variants like "SC" or "TC".
AT28C64B-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:
- 10ms
- 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
AT28C64B-15PC FAQ
1.How can I place an order for AT28C64B-15PC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT28C64B-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 AT28C64B-15PC reliable?
The price and inventory of AT28C64B-15PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT28C64B-15PC is usually 5 days.
3.What payment methods are accepted for AT28C64B-15PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT28C64B-15PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT28C64B-15PC?
AT28C64B-15PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT28C64B-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 AT28C64B-15PC?
For technical support, including AT28C64B-15PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT28C64B-15PC requirements.
6.How does Aetrix verify that AT28C64B-15PC is sourced from the original manufacturer or authorized distributors?
All AT28C64B-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 AT28C64B-15PC meets industry standards.
7.What is the process for return or replacement of AT28C64B-15PC?
All AT28C64B-15PC units undergo pre-shipment inspection (PSI). If there is an issue with AT28C64B-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 AT28C64B-15PC part is unused and in its original packaging.
Return procedure for AT28C64B-15PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT28C64B-15PC Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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AT24CS02-SSHM-T
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