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Microchip Technology AT28HC64B-12JU
- Part No.:
- AT28HC64B-12JU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT28HC64B-12JU.pdf
- Description:
- IC EEPROM 64KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:210
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Product details
Overview
AT28HC64B-12JU from Atmel is a 64 Kbit (8K × 8) parallel EEPROM with JEDEC-standard byte-wide pinout, 120 ns read access time, 10 ms page write cycle, and industrial temperature range (−40°C to +85°C). It supports hardware/software data protection, DATA polling, and toggle-bit write completion detection for embedded control and firmware storage applications.
For engineers reviewing the AT28HC64B-12JU datasheet, AT28HC64B-12JU pinout, AT28HC64B-12JU application, or AT28HC64B-12JU equivalent, key selection criteria include page-write timing (10 ms max), CMOS/TTL compatibility, 5 V ±10% single-supply operation, and PLCC-32 green packaging with VCC sense and noise-filtered write enable.
Technical Context
The AT28HC64B-12JU implements a parallel interface with static RAM-like read/write access-no external timing components required. Its internal 64-byte page register enables simultaneous latching of up to 64 bytes, with address/data capture on falling CE or WE edges and automatic internal programming timing.
Write completion is verified via dual methods: DATA polling (I/O7 complement inversion) and toggle-bit detection (I/O6 toggling during write). Hardware protection includes VCC sense (<3.8 V inhibit), 5 ms power-on delay, OE/CE/WE state-based write inhibition, and 15 ns noise filtering on control inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 64 Kbit (8,192 × 8), sufficient for boot code, calibration tables, or configuration storage in microcontroller systems |
| Read Access Time | 120 ns maximum-meets timing budgets for 8-bit bus interfaces operating up to ~8 MHz |
| Page Write Cycle | 10 ms maximum-enables efficient bulk updates without per-byte overhead |
| VCC Supply | 5 V ±10%-compatible with legacy 5 V logic rails and eliminates need for voltage regulators |
| Standby Current | 100 µA CMOS-supports low-power modes in battery-backed or energy-sensitive systems |
| Endurance | 100,000 write/erase cycles-validates long-term field reliability for infrequent parameter updates |
| Data Retention | 10 years at 85°C-ensures firmware integrity across industrial product lifecycles |
Pinout & Package
AT28HC64B-12JU uses a 32-lead Plastic J-Leaded Chip Carrier (PLCC) package per JEDEC MS-016, Variation AE, with 1.27 mm pitch and lead coplanarity ≤0.102 mm. Pins 1 and 17 are Don't Connect (DC).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A12 | Address Inputs | 13-bit address bus selecting one of 8,192 memory locations; A6–A12 define page boundaries for 64-byte writes |
| I/O0–I/O7 | Bidirectional Data Bus | CMOS/TTL-compatible 8-bit data path for read/write operations; I/O7 used for DATA polling, I/O6 for toggle-bit detection |
| CE | Chip Enable | Active-low chip select-must be low with OE low and WE high for read; low with OE high and WE low for write |
| OE | Output Enable | Active-low output control-high during write to prevent bus contention; low only during valid read cycles |
| WE | Write Enable | Active-low write strobe-edge-triggered latching of address/data; filtered against <15 ns noise pulses |
| VCC / GND | Power Supply | Single 5 V supply with decoupling recommended; GND referenced for all input thresholds and output levels |
| NC / DC | No Connect / Don't Connect | Pins 1 and 17 are unconnected-must remain floating per manufacturer specification |
Key Features
| Feature | Design Value |
|---|---|
| Page Write Operation | Writes 1–64 bytes in one internal cycle (10 ms), freeing address/data bus after latching-reduces host CPU overhead vs. byte-by-byte writes |
| Software Data Protection (SDP) | User-enabled/disabled via 3-byte command sequence (AAh/55h/A0h); prevents accidental writes while allowing protected updates using same sequence |
| Hardware Write Inhibit | VCC sense (<3.8 V), 5 ms power-on delay, and noise filtering ensure robustness during brown-out or EMI events |
| End-of-Write Detection | Dual methods: DATA polling (I/O7) and toggle bit (I/O6)-enables deterministic host synchronization without fixed delays |
| Device Identification Area | 64 extra bytes (1FC0h–1FFFh) accessible via 12 V on A9-supports unique serialization or firmware version tracking |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Data |
|---|---|
Use Scenario: Storing I/O mapping, PID tuning parameters, and alarm thresholds in programmable logic controllers with no external NVRAM controller. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed via parallel bus; 120 ns read time aligns with 8-bit microcontroller wait-state requirements. Use Value: Eliminates need for external write-cycle timers or status polling logic-DATA polling and toggle bit simplify firmware integration. | Use Scenario: Retaining sensor calibration coefficients and device-specific correction factors across power cycles in portable diagnostic equipment. IC Role / Device Role / Timing Role: High-reliability parameter storage with 100,000 endurance cycles and 10-year data retention at 85°C. Use Value: Ensures regulatory-compliant traceability and accuracy stability without battery backup or FRAM cost premium. |
| Automotive Body Control Module (BCM) | Test Equipment Firmware Patch Storage |
Use Scenario: Holding seat/mirror position presets and lighting profiles in automotive BCMs operating across −40°C to +85°C ambient. IC Role / Device Role / Timing Role: Industrial-grade EEPROM interfaced directly to 8-bit MCU parallel bus; green (Pb/halide-free) PLCC-32 meets RoHS compliance. Use Value: Hardware write protection prevents corruption during vehicle battery transients; VCC sense blocks writes below 3.8 V. | Use Scenario: Storing field-upgradable firmware patches in automated test systems where full reflash is impractical between production runs. IC Role / Device Role / Timing Role: Page-write capable memory enabling fast patch loading (≤10 ms per 64-byte block) without halting main processor. Use Value: Reduces downtime by supporting incremental updates-software data protection prevents accidental overwrite during hot-swap operations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar parallel EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT28HC64B-12SU | Same die, SOIC-28 package (vs. PLCC-32); 120 ns speed grade; identical electrical specs and features | Suitable for surface-mount PCBs with space constraints; lacks PLCC's socket compatibility and thermal mass | Select when board layout favors gull-wing leads and reflow compatibility is prioritized over field-serviceability. |
| ST M48T02-12MH6 | 64 Kbit parallel EEPROM in 28-pin SOIC; 120 ns access; includes built-in lithium battery for real-time clock backup (not present in AT28HC64B-12JU) | Used where RTC + NVRAM integration is required; higher system cost and complexity due to battery management | Choose only if RTC functionality is mandatory; otherwise, AT28HC64B-12JU offers lower BOM cost and simpler power architecture. |
Compared with AT28HC64B-12SU, the AT28HC64B-12JU provides socket-ready PLCC packaging for prototyping and repair, while ST M48T02-12MH6 adds RTC capability at the expense of higher quiescent current and battery lifecycle concerns-neither is pin-compatible, requiring PCB redesign.
Availability
AT28HC64B-12JU is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, and automotive body electronics requiring stable component supply, long-term lifecycle support, and green packaging compliance.
Supply support for AT28HC64B-12JU 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 company specializing in microcontrollers, nonvolatile memory, and secure authentication ICs.
The AT28HC64B product line delivers high-reliability parallel EEPROMs optimized for embedded systems needing deterministic write timing, hardware/software data protection, and industrial temperature operation without external support circuitry.
FAQ
What is the maximum page write cycle time for AT28HC64B-12JU?
The AT28HC64B-12JU has a maximum page write cycle time of 10 ms under standard conditions. This value is guaranteed across the industrial temperature range (−40°C to +85°C) and applies to all 1–64 byte writes within the same page boundary defined by A6–A12. The AT28HC64BF variant reduces this to 2 ms, but AT28HC64B-12JU does not support that option.
Does AT28HC64B-12JU support both hardware and software write protection?
Yes, AT28HC64B-12JU implements dual-layer protection: hardware features include VCC sense (<3.8 V inhibit), 5 ms power-on delay, and 15 ns noise filtering on WE/CE; software protection is enabled via a three-byte command sequence (AAh/55h/A0h) written to specific addresses. Both mechanisms operate independently and are active by default at power-up.
What package type is used for AT28HC64B-12JU?
AT28HC64B-12JU uses a 32-lead Plastic J-Leaded Chip Carrier (PLCC) package, designated "32J" in Atmel's ordering guide. Pins 1 and 17 are Don't Connect (DC), and the package complies with JEDEC MS-016, Variation AE. It is Pb/halide-free and rated for industrial temperature operation.
How is write completion detected on AT28HC64B-12JU?
AT28HC64B-12JU supports two independent end-of-write detection methods: DATA polling monitors I/O7, which outputs the complement of the last written byte until completion, then returns true data; toggle bit detection observes I/O6, which toggles between 0 and 1 during the write cycle and stabilizes upon completion. Both methods allow host software to synchronize without fixed timeouts.
Can AT28HC64B-12JU be used with 3.3 V systems?
No, AT28HC64B-12JU requires a single 5 V ±10% supply (4.5 V to 5.5 V) and is not 3.3 V tolerant. Its inputs are CMOS/TTL compatible but specified only for 5 V logic levels; applying 3.3 V to VCC will result in undefined operation and potential data corruption. For 3.3 V systems, consider serial EEPROMs or level-shifting interfaces.
AT28HC64B-12JU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT28HC64B-12JU FAQ
1.How can I place an order for AT28HC64B-12JU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT28HC64B-12JU 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-12JU reliable?
The price and inventory of AT28HC64B-12JU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT28HC64B-12JU is usually 5 days.
3.What payment methods are accepted for AT28HC64B-12JU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT28HC64B-12JU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT28HC64B-12JU?
AT28HC64B-12JU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT28HC64B-12JU 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-12JU?
For technical support, including AT28HC64B-12JU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT28HC64B-12JU requirements.
6.How does Aetrix verify that AT28HC64B-12JU is sourced from the original manufacturer or authorized distributors?
All AT28HC64B-12JU 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-12JU meets industry standards.
7.What is the process for return or replacement of AT28HC64B-12JU?
All AT28HC64B-12JU units undergo pre-shipment inspection (PSI). If there is an issue with AT28HC64B-12JU, 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-12JU part is unused and in its original packaging.
Return procedure for AT28HC64B-12JU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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