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Microchip Technology AT28BV64B-20SI
- Part No.:
- AT28BV64B-20SI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AT28BV64B-20SI.pdf
- Description:
- IC EEPROM 64KBIT PARALLEL 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,880
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Product details
Overview
AT28BV64B-20SI from Microchip Technology (formerly Atmel) is a 64 Kbit (8K × 8) parallel EEPROM with battery-voltage operation (2.7V–3.6V), 200 ns read access time, and hardware/software data protection. It supports page write (1–64 bytes), DATA polling, and toggle-bit write completion detection. Used in industrial control modules for nonvolatile parameter storage requiring reliable reprogramming under varying supply conditions.
For engineers reviewing the AT28BV64B-20SI datasheet, AT28BV64B-20SI pinout, AT28BV64B-20SI application, or AT28BV64B-20SI equivalent, key selection considerations include JEDEC byte-wide parallel interface compatibility, 100,000-cycle endurance, 10-year data retention, industrial temperature range (−40°C to +85°C), and green (Pb/halide-free) SOIC packaging.
Technical Context
The AT28BV64B-20SI operates as a drop-in static RAM-compatible parallel EEPROM: CE/OE/WE control enables bus-friendly read/write without external timing logic. Its internal 64-byte page register latches address and data during page writes, freeing the bus for concurrent operations.
Write completion is verified via dual methods-DATA polling on I/O7 (complement-to-data during write, true data after completion) and toggle-bit monitoring on I/O6-enabling flexible host-side timing management. Software Data Protection requires a mandatory 3-byte command sequence (AAh/55h/A0h at specific addresses) before each write, preventing corruption during power transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 64 Kbit (8,192 × 8), organized as byte-addressable parallel array |
| Read Access Time | 200 ns - enables direct replacement of SRAM in legacy 8-bit microcontroller systems |
| Supply Voltage | 2.7V–3.6V - supports single-supply battery-powered and industrial 3.3V systems |
| Page Write Cycle | ≤10 ms - allows efficient bulk configuration updates without per-byte overhead |
| Endurance | 100,000 write/erase cycles - suitable for field-updatable firmware tables and calibration data |
| Data Retention | 10 years at 85°C - ensures long-term reliability in unattended industrial deployments |
| Standby Current | 20 µA CMOS - minimizes quiescent power in always-on monitoring devices |
Pinout & Package
AT28BV64B-20SI uses a 28-lead, 0.300" wide plastic gull-wing small outline (SOIC) package compliant with JEDEC MS-013, with 1.27 mm pitch and surface-mount footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A12 | Address Inputs | 13-bit address bus supporting full 8K-word addressing (0000H–1FFFH) |
| I/O0–I/O7 | Bidirectional Data Bus | Byte-wide parallel interface compatible with 8-bit microcontrollers and FPGAs |
| CE | Chip Enable | Active-low chip select; disables device and reduces current to 20 µA when high |
| OE | Output Enable | Active-low output control; places I/O pins in high-impedance state when high |
| WE | Write Enable | Active-low write strobe; initiates byte or page write upon falling edge |
| GND / VCC | Power Supply | Ground reference and 2.7–3.6V supply input; decoupling capacitor required per datasheet |
| NC | No Connect | Unbonded pin; must remain floating (not tied to VCC/GND) |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC Byte-wide Pinout | Direct replacement for industry-standard 28-pin parallel EEPROMs and EPROMs in existing PCB layouts |
| Software Data Protection (SDP) | Three-step unlock sequence prevents accidental writes during power-up/down or noise events |
| Hardware Write Inhibit | VCC power-on delay (10 ms), WE/CE noise filtering (<15 ns), and OE/CE/WE level gating block spurious writes |
| Dual Write Completion Detection | Simultaneous support for DATA polling (I/O7) and toggle-bit (I/O6) enables robust host firmware timing strategies |
| Device Identification Area | Dedicated 64-byte user-accessible region (7FC0H–7FFFH) for serialization, calibration, or traceability data |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Tables |
|---|---|
Use Scenario: Storing I/O mapping, scaling factors, and alarm thresholds in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed via 8-bit parallel bus during boot and runtime parameter updates. Use Value: 100,000-cycle endurance and 10-year data retention ensure integrity across decades of maintenance cycles without backup batteries. | Use Scenario: Holding sensor calibration coefficients and safety-critical operational limits in portable diagnostic equipment operating across −20°C to +60°C ambient. IC Role / Device Role / Timing Role: Battery-voltage EEPROM interfaced to an ARM Cortex-M0+ MCU for secure, low-power parameter persistence. Use Value: 2.7–3.6V operation eliminates level-shifting; 20 µA standby current extends battery life between recalibrations. |
| Automotive Body Control Module (BCM) | Smart Energy Meter Firmware Patch Storage |
Use Scenario: Storing seat/mirror position presets, lighting profiles, and fault logs in automotive BCMs qualified for extended temperature operation. IC Role / Device Role / Timing Role: Parallel EEPROM used alongside CAN controller for infrequent but critical nonvolatile data logging. Use Value: Industrial temperature range (−40°C to +85°C) and green Pb/halide-free packaging meet AEC-Q200 and RoHS requirements. | Use Scenario: Hosting field-upgradable firmware patches and tariff schedule updates in utility-grade electricity meters with 15+ year service life. IC Role / Device Role / Timing Role: High-reliability EEPROM providing secure, tamper-resistant storage for signed firmware fragments. Use Value: Hardware + software data protection prevents corruption during brown-out events common in grid-edge deployments. |
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 Kbit, 250 ns access, 3.3V-only (3.0–3.6V), no software data protection | Lacks SDP and 2.7V operation; requires tighter supply regulation | Choose when only 3.3V supply is available and hardware-only protection suffices |
| ON Semiconductor CAT28C64B | 64 Kbit, 200 ns access, 4.5–5.5V supply, no page write or DATA polling | Requires 5V system; limited to byte-write only; no built-in write completion signaling | Choose for legacy 5V designs where page write efficiency and polling are not required |
Compared with ST M28W640ECT and CAT28C64B, the AT28BV64B-20SI uniquely combines 2.7–3.6V operation, JEDEC-compliant pinout, page write capability, and dual write-detection methods-making it optimal for modern low-voltage industrial and medical systems requiring robust, flexible nonvolatile storage.
Availability
AT28BV64B-20SI is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostics equipment, automotive body control modules, smart energy meters, and embedded instrumentation requiring stable component supply across long product lifecycles.
Supply support for AT28BV64B-20SI 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
Microchip Technology acquired Atmel in 2016 and maintains full support for legacy Atmel memory products including the AT28BV64B family.
The AT28BV64B series was designed for industrial and automotive applications requiring high-reliability, low-voltage parallel EEPROM with integrated data protection and extended temperature operation.
FAQ
What is the maximum page write size supported by the AT28BV64B-20SI?
The AT28BV64B-20SI supports page write operations of 1 to 64 bytes per cycle. The internal 64-byte page register allows simultaneous latching of up to 64 bytes, with all written bytes required to reside on the same page (defined by A6–A12). This enables efficient bulk updates without repeated command overhead. Each byte must be loaded within 100 µs of the prior byte to maintain page mode operation.
Does the AT28BV64B-20SI require external circuitry for write protection?
No, the AT28BV64B-20SI integrates both hardware- and software-based write protection. Hardware protection includes VCC power-on delay, noise filtering on WE/CE inputs, and write inhibit via OE/CE/WE logic levels. Software Data Protection (SDP) mandates a three-byte unlock sequence (AAh/55h/A0h) before any write-eliminating need for external lock bits or discrete protection circuitry.
Can the AT28BV64B-20SI be used in a 5V system?
No, the AT28BV64B-20SI is specified only for 2.7V to 3.6V operation. Applying 5V to VCC exceeds absolute maximum ratings and will damage the device. For 5V systems, consider alternatives like the CAT28C64B. Level-shifting is not recommended due to timing and signal integrity risks with the parallel interface.
How is write completion detected on the AT28BV64B-20SI?
Write completion on the AT28BV64B-20SI is detected using two independent methods: DATA polling on I/O7 (returns complement of written data during write, true data afterward) and toggle-bit monitoring on I/O6 (toggles between 0/1 until completion, then stabilizes). Both methods allow host firmware to poll asynchronously without fixed delays, improving system responsiveness and reliability.
What is the purpose of the additional 64-byte memory area in the AT28BV64B-20SI?
AT28BV64B-20SI includes an extra 64-byte EEPROM region (addresses 7FC0H–7FFFH) accessible by raising A9 to 12V ±0.5V. This area is intended for device-specific data such as serial numbers, calibration constants, manufacturing date codes, or security keys-separate from main memory to prevent accidental overwrites during routine configuration updates.
AT28BV64B-20SI 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:
- 10ms
- Access Time:
- 200 ns
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOIC
AT28BV64B-20SI FAQ
1.How can I place an order for AT28BV64B-20SI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT28BV64B-20SI 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 AT28BV64B-20SI reliable?
The price and inventory of AT28BV64B-20SI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT28BV64B-20SI is usually 5 days.
3.What payment methods are accepted for AT28BV64B-20SI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT28BV64B-20SI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT28BV64B-20SI?
AT28BV64B-20SI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT28BV64B-20SI 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 AT28BV64B-20SI?
For technical support, including AT28BV64B-20SI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT28BV64B-20SI requirements.
6.How does Aetrix verify that AT28BV64B-20SI is sourced from the original manufacturer or authorized distributors?
All AT28BV64B-20SI 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 AT28BV64B-20SI meets industry standards.
7.What is the process for return or replacement of AT28BV64B-20SI?
All AT28BV64B-20SI units undergo pre-shipment inspection (PSI). If there is an issue with AT28BV64B-20SI, 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 AT28BV64B-20SI part is unused and in its original packaging.
Return procedure for AT28BV64B-20SI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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