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Microchip Technology AT28HC64B-12JC
- Part No.:
- AT28HC64B-12JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT28HC64B-12JC.pdf
- Description:
- IC EEPROM 64KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,919
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Product details
Overview
AT28HC64B-12JC from Atmel is a 64 Kbit (8K × 8) parallel EEPROM with JEDEC-standard byte-wide pinout, 120 ns maximum access time, 5 V ±10% single-supply operation, and hardware/software data protection. It supports page write (1–64 bytes), DATA polling, and toggle-bit write completion detection for embedded control and configuration storage in industrial instrumentation.
For engineers reviewing the AT28HC64B-12JC datasheet, AT28HC64B-12JC pinout, AT28HC64B-12JC application, or AT28HC64B-12JC equivalent, key selection considerations include its 120 ns read timing, 10 ms standard page write cycle, CMOS/TTL-compatible I/O, industrial-grade temperature range option, and dual-layer write protection architecture.
Technical Context
The AT28HC64B-12JC implements a static RAM-like interface with CE/OE/WE control logic enabling seamless integration into legacy microcontroller buses. Its internal 64-byte page register latches address and data during page writes, freeing the bus for concurrent operations while the device autonomously executes internal programming.
Write completion is verified via two independent methods: DATA polling on I/O7 (complement-to-data during write, true data after completion) and toggle-bit behavior on I/O6. Hardware protection includes VCC sense (<3.8 V inhibit), 5 ms power-on delay, and noise filtering on WE/CE inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 64 Kbit (8,192 × 8 bits) - supports full byte-addressable nonvolatile storage without external address decoding. |
| Access Time | 120 ns max - ensures compatibility with 8 MHz Z80, 68K, and early ARM bus cycles requiring ≤120 ns read latency. |
| Page Write Cycle | 10 ms max (standard) - enables efficient firmware parameter updates across up to 64 contiguous bytes per command. |
| VCC Supply | 5 V ±10% - operates directly from standard logic rail without regulation, reducing BOM count in legacy systems. |
| Standby Current | 100 µA CMOS - minimizes quiescent power in battery-backed or always-on monitoring nodes. |
| Endurance | 100,000 write/erase cycles - supports >10 years of daily configuration updates in field-deployed equipment. |
| Data Retention | 10 years at 85°C - guarantees long-term reliability in industrial enclosures without active thermal management. |
Pinout & Package
AT28HC64B-12JC is supplied in a 28-lead plastic gull-wing small outline (SOIC) package (package code "SC"), JEDEC MS-013 compliant, with 300-mil body width and 1.27 mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A12 | Address Inputs | 13-bit address bus supporting full 8K-word addressing; A0–A5 select byte within 64-byte page during page write. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for read; inhibits all writes when high. |
| OE | Output Enable | Active-low output gate; places I/O0–I/O7 in high-impedance state when high, preventing bus contention. |
| WE | Write Enable | Active-low write strobe; initiates byte or page write on falling edge; combined with CE for dual-control write safety. |
| I/O0–I/O7 | Bi-directional Data Bus | CMOS/TTL-compatible 8-bit data path; carries input data during write, output data during read, and status bits (I/O6/I/O7) during polling. |
| GND / VCC | Power Terminals | Single 5 V supply with dedicated ground; decoupling capacitor placement near VCC/GND pins critical for noise immunity during write cycles. |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC Byte-wide Pinout | Direct drop-in replacement for industry-standard 27C64/28C64 EPROMs/EEPROMs without PCB redesign. |
| Software Data Protection (SDP) | User-configurable 3-byte unlock sequence prevents accidental writes during power transitions or firmware bugs. |
| Hardware Write Inhibit | VCC sense, 5 ms power-on delay, and 15 ns noise filtering eliminate spurious writes from supply glitches or EMI. |
| 64-byte Page Register | Enables burst loading of configuration blocks (e.g., calibration tables) with single-command efficiency and bus release. |
| DATA Polling & Toggle Bit | Dual, independent write-complete detection methods allow flexible host polling strategies without timer dependencies. |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Data |
|---|---|
|
Use Scenario: Storing sensor calibration coefficients and operational thresholds in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed during boot and runtime reconfiguration; 120 ns read time aligns with PLC scan cycle timing budgets. Use Value: Ensures deterministic startup and field-updatable parameters without requiring external NVRAM controllers or battery backup. |
Use Scenario: Retaining patient-specific therapy settings and transducer calibration data in portable infusion pumps and diagnostic monitors. IC Role / Device Role / Timing Role: Secure, tamper-resistant parameter storage with software/hardware write protection meeting IEC 62304 safety requirements. Use Value: Prevents unintended parameter changes during power cycling or ESD events, maintaining regulatory compliance for Class II medical devices. |
| Telecom Line Card Boot Parameters | Automotive Body Control Module IDs |
|
Use Scenario: Holding board-specific initialization values (e.g., MAC address, firmware version, port mapping) on telecom line cards operating in NEBS-compliant cabinets. IC Role / Device Role / Timing Role: Parallel EEPROM interfaced to FPGA or microcontroller bus; 100 µA standby current reduces thermal load in densely packed chassis. Use Value: Enables hot-swap capable line cards with persistent identity and configuration across power cycles and field replacements. |
Use Scenario: Storing unique vehicle identification codes, feature enable bits, and regional configuration flags in automotive BCMs operating across -40°C to +85°C. IC Role / Device Role / Timing Role: Industrial-temperature-rated nonvolatile memory with 10-year data retention at 85°C for under-hood deployment. Use Value: Guarantees reliable operation over full vehicle lifetime without degradation, eliminating need for periodic recalibration or reprogramming. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar parallel EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ST M28W640ECT | 64 Mbit capacity, 120 ns access, but requires 3.3 V supply and lacks software data protection. | Targeted at high-density boot code storage, not low-power configuration retention. | Select when migrating to 3.3 V systems and needing larger memory; verify voltage translation for 5 V hosts. |
| Microchip 25LC640A-I/P | 64 Kbit SPI interface, 5 V operation, 5 ms write cycle, no page register or DATA polling. | Suited for space-constrained designs where serial interface suffices and bus bandwidth is secondary. | Choose for simplified routing and reduced pin count; accept longer write times and lack of real-time completion feedback. |
Compared with ST M28W640ECT and Microchip 25LC640A-I/P, the AT28HC64B-12JC uniquely delivers 5 V parallel interface, hardware/software write protection, and dual-method write completion signaling-critical for deterministic, safety-critical configuration storage in legacy industrial platforms.
Availability
AT28HC64B-12JC is available at Aetrix Electronics and suitable for industrial PLCs, medical instrumentation, telecom line cards, and automotive body control modules requiring stable component supply across extended product lifecycles.
Supply support for AT28HC64B-12JC 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 AT28HC64B belongs to Atmel's parallel EEPROM product line, designed specifically for pin-compatible upgrades of EPROM-based systems and robust configuration storage in harsh environments with wide temperature operation.
FAQ
What is the maximum access time specification for the AT28HC64B-12JC?
The AT28HC64B-12JC has a maximum address-to-output delay (tACC) of 120 ns, as indicated by the "12" suffix in its part number. This timing applies across the commercial temperature range (0°C to +70°C) and ensures compatibility with microcontrollers and FPGAs requiring ≤120 ns read latency on parallel buses.
Does the AT28HC64B-12JC support page write operations, and what is the maximum page size?
Yes, the AT28HC64B-12JC supports page write operations with a fixed 64-byte page size. Up to 64 bytes can be loaded sequentially within 150 µs intervals, after which the device automatically executes the internal programming cycle. This capability significantly accelerates bulk configuration updates compared to byte-by-byte writes.
How does hardware write protection function on the AT28HC64B-12JC?
Hardware protection on the AT28HC64B-12JC includes four mechanisms: (1) VCC sense that disables writes below 3.8 V, (2) 5 ms automatic power-on delay before write enable, (3) write inhibition when OE is low, CE is high, or WE is high, and (4) 15 ns noise filtering on WE/CE inputs to reject EMI-induced pulses.
Can the AT28HC64B-12JC be used in industrial temperature applications?
The AT28HC64B-12JC itself is rated for commercial temperature (0°C to +70°C). For industrial operation (-40°C to +85°C), the equivalent part number is AT28HC64B-12JI (PLCC) or AT28HC64B-12SI (SOIC). The "I" suffix denotes industrial temperature grade, while "J" and "S" indicate PLCC and SOIC packages respectively.
What are the two methods for detecting write completion on the AT28HC64B-12JC?
The AT28HC64B-12JC provides two independent write completion detection methods: (1) DATA polling, where I/O7 outputs the complement of the last written byte until completion, then true data; and (2) toggle-bit detection, where I/O6 toggles between 0 and 1 during the write cycle and stabilizes upon completion. Both methods allow host software to avoid fixed delays.
AT28HC64B-12JC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- 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:
- 120 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT28HC64B-12JC FAQ
1.How can I place an order for AT28HC64B-12JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT28HC64B-12JC 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 AT28HC64B-12JC reliable?
The price and inventory of AT28HC64B-12JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT28HC64B-12JC is usually 5 days.
3.What payment methods are accepted for AT28HC64B-12JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT28HC64B-12JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT28HC64B-12JC?
AT28HC64B-12JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT28HC64B-12JC 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 AT28HC64B-12JC?
For technical support, including AT28HC64B-12JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT28HC64B-12JC requirements.
6.How does Aetrix verify that AT28HC64B-12JC is sourced from the original manufacturer or authorized distributors?
All AT28HC64B-12JC 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 AT28HC64B-12JC meets industry standards.
7.What is the process for return or replacement of AT28HC64B-12JC?
All AT28HC64B-12JC units undergo pre-shipment inspection (PSI). If there is an issue with AT28HC64B-12JC, 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 AT28HC64B-12JC part is unused and in its original packaging.
Return procedure for AT28HC64B-12JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT28HC64B-12JC Tags
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