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Microchip Technology AT28HC64B-12PI
- Part No.:
- AT28HC64B-12PI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
AT28HC64B-12PI.pdf
- Description:
- IC EEPROM 64KBIT PARALLEL 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,204
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Product details
Overview
AT28HC64B-12PI from Atmel is a 64 Kbit (8K × 8) parallel EEPROM with JEDEC-standard byte-wide pinout, 120 ns maximum read access time, single 5 V ±10% supply operation, and hardware/software data protection-used in industrial control firmware storage, BIOS configuration backup, and embedded system parameter retention.
For engineers reviewing the AT28HC64B-12PI datasheet, AT28HC64B-12PI pinout, AT28HC64B-12PI application, or AT28HC64B-12PI equivalent, key selection criteria include page write capability (1–64 bytes), DATA polling/toggle bit for write completion detection, CMOS/TTL compatibility, industrial temperature range (−40°C to +85°C), and green Pb/halide-free packaging option.
Technical Context
The AT28HC64B-12PI implements a static RAM-compatible interface with dual-line chip enable (CE) and output enable (OE) control to prevent bus contention. Its internal 64-byte page register latches address and data during write cycles, freeing the bus for concurrent operations.
Write completion is verified via I/O7 DATA polling (complement-to-data behavior) or I/O6 toggle bit detection-both usable at any point during tWC. Hardware protection includes VCC sense (<3.8 V inhibit), 5 ms power-on delay, noise filtering on WE/CE, and write-inhibit logic (OE low, CE high, or WE high).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 64 Kbit (8,192 × 8), organized as byte-addressable nonvolatile storage |
| Read Access Time | 120 ns max - defines minimum clock-to-data latency in synchronous systems |
| Page Write Cycle | 10 ms max - enables burst programming of up to 64 bytes without external timing control |
| Endurance | 100,000 write/erase cycles - supports long-term field updates in maintenance-critical systems |
| Data Retention | 10 years at 85°C - ensures configuration integrity across full industrial temperature life |
| Supply Voltage | 5 V ±10% - compatible with legacy 5 V logic rails without level-shifting |
| Standby Current | 100 µA CMOS - enables low-power hold states in battery-backed applications |
Pinout & Package
AT28HC64B-12PI is supplied in a 28-lead PDIP (Plastic Dual Inline Package), 0.600" wide, with JEDEC-standard byte-wide pinout and no internal connections on pins 1 and 28 (NC). Pin functions are electrically identical across PDIP, SOIC, TSOP, and PLCC variants.
| 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 page write |
| CE | Chip Enable | Active-low global device select; must be low with OE low and WE high for read access |
| OE | Output Enable | Active-low output gate; high-Z state when high, enabling bus sharing with other peripherals |
| WE | Write Enable | Active-low write strobe; falling edge latches address, rising edge latches data in byte/page mode |
| I/O0–I/O7 | Bidirectional Data Bus | CMOS/TTL-compatible 8-bit data path; carries complemented data on I/O7 during polling |
| GND / VCC | Power Terminals | Ground reference and 5 V supply; decoupling required within 1 cm per JEDEC layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Page Write Operation | Supports 1–64-byte writes in single internal cycle (tWC = 10 ms), reducing host CPU overhead vs. byte-by-byte programming |
| DATA Polling & Toggle Bit | Dual asynchronous write-complete detection methods eliminate need for fixed delays or external timers |
| Software Data Protection (SDP) | User-configurable lock/unlock via 3-byte command sequence (AAh/55h/A0h or AAh/55h/80h/AAh/20h) prevents accidental writes during power transitions |
| Hardware Write Inhibit | VCC sense, 5 ms power-on delay, and noise filtering (15 ns pulse rejection) ensure robustness in noisy industrial environments |
| Extended Identification Area | 64-byte dedicated EEPROM region (1FC0H–1FFFH) accessible via 12 V on A9 for unique device serialization or calibration data |
Applications
| Industrial PLC Configuration Storage | Embedded System Bootloader Parameter Backup |
|---|---|
|
Use Scenario: Storing I/O mapping tables, PID tuning constants, and alarm thresholds in programmable logic controllers operating continuously in factory environments. IC Role / Device Role / Timing Role: Nonvolatile configuration register providing deterministic startup state after power loss or reset. Use Value: 10-year data retention at 85°C ensures parameter persistence across extended maintenance intervals without battery support. |
Use Scenario: Preserving bootloader version, secure boot keys, and hardware revision flags in network-connected edge devices deployed in remote infrastructure. IC Role / Device Role / Timing Role: Secure parameter vault accessed only during initialization, isolated from runtime firmware execution paths. Use Value: Software Data Protection (SDP) prevents corruption during over-the-air update failures or brown-out conditions. |
| Legacy PC BIOS/UEFI Firmware Shadow Storage | Medical Device Calibration Data Archive |
|
Use Scenario: Holding checksum-verified BIOS shadow copies and CMOS setup defaults in industrial motherboards where flash reprogramming risks system instability. IC Role / Device Role / Timing Role: Parallel-accessed backup memory mapped alongside main ROM, enabled only during POST or recovery sequences. Use Value: JEDEC-standard pinout allows drop-in replacement of older EEPROMs without PCB redesign or signal routing changes. |
Use Scenario: Archiving sensor calibration coefficients, usage counters, and regulatory audit logs in Class II medical instruments requiring traceable data history. IC Role / Device Role / Timing Role: Tamper-resistant storage with hardware write inhibit and SDP, accessed exclusively by certified diagnostic firmware. Use Value: 100,000-cycle endurance supports daily recalibration logging over 27+ years of clinical service life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar parallel EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT28HC64B-12JI | Same electrical specs and timing; 32-lead PLCC package instead of 28-lead PDIP | Higher board density and thermal performance; requires different footprint and reflow profile | Select for space-constrained industrial modules where surface-mount assembly is preferred |
| AT28HC64B-12SI | Same speed grade and functionality; 28-lead SOIC package with gull-wing leads | Improved vibration resistance and moisture barrier vs. PDIP; compatible with automated optical inspection | Select for high-reliability automotive-adjacent equipment where mechanical shock tolerance is critical |
Compared with AT28HC64B-12PI, the AT28HC64B-12JI offers superior thermal dissipation in compact layouts but requires PLCC socket or reflow tooling, while the AT28HC64B-12SI provides better long-term solder joint reliability in thermally cycled environments-neither is pin-compatible due to differing lead counts and pitch.
Availability
AT28HC64B-12PI is available at Aetrix Electronics and suitable for industrial PLC configuration storage, embedded system bootloader parameter backup, and legacy PC BIOS/UEFI firmware shadow storage requiring stable component supply across multi-year production cycles.
Supply support for AT28HC64B-12PI 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 product line delivers high-reliability parallel EEPROMs optimized for firmware backup, configuration storage, and calibration data retention in harsh environments with extended temperature and endurance requirements.
FAQ
What is the maximum page write size supported by the AT28HC64B-12PI?
The AT28HC64B-12PI supports page write operations of 1 to 64 bytes per internal programming cycle. All bytes must reside on the same page, defined by identical A6–A12 address bits during each WE transition. This capability reduces host processor intervention compared to byte-wise writes and is confirmed in Section 4.3 of the official datasheet.
Does the AT28HC64B-12PI require a 12 V supply for normal operation?
No, the AT28HC64B-12PI operates from a single 5 V ±10% supply under all standard read/write conditions. The 12 V requirement applies only to accessing the optional 64-byte device identification area (1FC0H–1FFFH) by raising A9 to 12.0 V ±0.5 V-this is strictly for factory programming or field calibration, not routine operation.
How does software data protection (SDP) work on the AT28HC64B-12PI?
SDP on the AT28HC64B-12PI is enabled or disabled using specific three- or five-byte command sequences written to fixed addresses (e.g., 1555h, 0AAAh). Once enabled, all subsequent writes require reissuing the same sequence. The AT28HC64B-12PI retains SDP state across power cycles, and the feature is shipped disabled from Atmel.
Can the AT28HC64B-12PI be used in place of faster 70 ns or 90 ns variants?
Yes-the AT28HC64B-12PI is functionally identical to AT28HC64B-70PI and AT28HC64B-90PI except for guaranteed maximum read access time (120 ns vs. 70/90 ns). It maintains full pin, timing, and software compatibility, making it suitable for cost-optimized designs where 120 ns latency is acceptable.
What package type is used for the AT28HC64B-12PI?
The AT28HC64B-12PI uses a 28-lead Plastic Dual Inline Package (PDIP), designated as 28P6 in Atmel's ordering nomenclature. Its 0.600" width, through-hole mounting, and JEDEC-standard pinout make it ideal for prototyping, legacy system upgrades, and industrial control boards requiring mechanical robustness.
AT28HC64B-12PI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 28-DIP (0.600", 15.24mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- 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:
- Through Hole
- Supplier Device Package:
- 28-PDIP
AT28HC64B-12PI FAQ
1.How can I place an order for AT28HC64B-12PI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT28HC64B-12PI 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-12PI reliable?
The price and inventory of AT28HC64B-12PI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT28HC64B-12PI is usually 5 days.
3.What payment methods are accepted for AT28HC64B-12PI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT28HC64B-12PI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT28HC64B-12PI?
AT28HC64B-12PI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT28HC64B-12PI 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-12PI?
For technical support, including AT28HC64B-12PI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT28HC64B-12PI requirements.
6.How does Aetrix verify that AT28HC64B-12PI is sourced from the original manufacturer or authorized distributors?
All AT28HC64B-12PI 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-12PI meets industry standards.
7.What is the process for return or replacement of AT28HC64B-12PI?
All AT28HC64B-12PI units undergo pre-shipment inspection (PSI). If there is an issue with AT28HC64B-12PI, 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-12PI part is unused and in its original packaging.
Return procedure for AT28HC64B-12PI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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