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Microchip Technology AT28BV64B-25SU
- Part No.:
- AT28BV64B-25SU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AT28BV64B-25SU.pdf
- Description:
- IC EEPROM 64KBIT PARALLEL 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,625
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Product details
Overview
AT28BV64B-25SU from Microchip Technology (formerly Atmel) is a 64 Kbit (8K × 8) parallel EEPROM with battery-voltage operation (2.7V–3.6V), 250 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 robust power-cycle resilience.
For engineers reviewing the AT28BV64B-25SU datasheet, AT28BV64B-25SU pinout, AT28BV64B-25SU application, or AT28BV64B-25SU equivalent, key selection criteria include JEDEC byte-wide pin compatibility, 100,000 write endurance, CMOS standby current ≤50 µA (industrial temp), and software data protection (SDP) command sequence compliance.
Technical Context
The AT28BV64B-25SU implements a static RAM-compatible parallel interface with dual-line chip enable (CE) and output enable (OE) control to prevent bus contention. Its internal 64-byte page register latches addresses and data during page writes, decoupling the host bus after initiation.
Write completion is verified via I/O7 DATA polling (complement-to-true transition) or I/O6 toggle-bit behavior. Software Data Protection requires a three-byte command sequence (0xAA→0x55→0xA0 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 bits); sufficient for firmware configuration tables or calibration data in embedded controllers. |
| Read Access Time | 250 ns max; enables direct replacement of SRAM in legacy systems without timing redesign. |
| Page Write Cycle | 10 ms max; allows burst programming of up to 64 bytes with single internal timer execution. |
| Endurance | 100,000 write/erase cycles; supports field-updatable parameters in industrial equipment with multi-year service life. |
| Data Retention | 10 years at 85°C; ensures long-term validity of stored settings in unpowered storage or high-temp environments. |
| Supply Voltage | 2.7V–3.6V; compatible with 3.3V logic systems and battery-backed operation down to 2.7V. |
| Standby Current | 50 µA max (industrial range); minimizes quiescent power in always-on monitoring devices. |
Pinout & Package
AT28BV64B-25SU is supplied in a 28-lead SOIC (28S) package per JEDEC MS-013, with 300-mil body width and gull-wing leads. Pin 1 identifier is marked by a beveled corner.
| 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 | 8-bit parallel interface; outputs valid data during reads, accepts input during writes; supports true bidirectional bus sharing. |
| CE | Chip Enable | Active-low global enable; must be low with OE low and WE high for read access; inhibits all operations when high. |
| OE | Output Enable | Active-low output gate; places I/O pins in high-impedance state when high, enabling bus sharing with other peripherals. |
| WE | Write Enable | Active-low write strobe; initiates byte or page write on falling edge; combined with CE for dual-control write safety. |
| GND / VCC | Power Supply | Ground reference and 2.7–3.6V supply; decoupling capacitor required within 10 mm of VCC pin for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC Byte-wide Pinout | Direct drop-in replacement for industry-standard 28-pin parallel EEPROMs (e.g., 28C64), eliminating PCB redesign. |
| Software Data Protection (SDP) | Three-step unlock sequence (0xAA/0x55/0xA0) prevents accidental writes during power ramp-up/down or EMI events. |
| Page Write with Internal Latching | Host releases address/data bus after first byte; device autonomously writes up to 64 bytes using internal timer-no external timing control needed. |
| DATA Polling & Toggle Bit | Dual asynchronous write-complete detection: I/O7 complement transition or I/O6 toggling enables efficient polling without fixed delays. |
| Extended Temperature Range | -40°C to +85°C operation certified; validated for use in motor drives, PLC I/O modules, and outdoor metering hardware. |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Data |
|---|---|
|
Use Scenario: Storing user-defined I/O mapping, scaling factors, and alarm thresholds in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Nonvolatile parameter register accessed during boot and runtime via parallel bus; retains values across power loss. Use Value: Eliminates need for battery-backed SRAM; 100,000-cycle endurance supports frequent field recalibration without wear-out risk. |
Use Scenario: Holding sensor offset/gain coefficients and regulatory audit logs in portable diagnostic equipment subject to sterilization cycles. IC Role / Device Role / Timing Role: Secure configuration store with SDP-enabled write locking; accessed only during calibration mode via microcontroller GPIO. Use Value: Prevents unauthorized parameter modification; 10-year data retention ensures calibration validity over device lifetime. |
| Automotive Body Control Module | Smart Energy Meter Firmware Patch Storage |
|
Use Scenario: Saving seat/mirror position presets and lighting profiles in vehicle body control units operating across automotive temperature extremes. IC Role / Device Role / Timing Role: Battery-voltage EEPROM interfaced to 3.3V MCU; powered from backup rail during ignition-off periods. Use Value: 2.7–3.6V operation tolerates brown-out conditions; industrial-grade temp rating (-40°C to +85°C) meets AEC-Q100 ambient requirements. |
Use Scenario: Storing firmware patch images and cryptographic keys in utility meters requiring field-upgradable code without full flash reprogramming. IC Role / Device Role / Timing Role: Dedicated patch repository accessed via SPI-to-parallel bridge; isolated from main application flash to prevent corruption. Use Value: Page write capability enables fast patch loading; DATA polling allows deterministic update timing without fixed delays. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar parallel EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ST M28W640ECB90N6E | 64 Mbit capacity, 90 ns access, 3.3V-only supply; no software data protection; PLCC-44 package. | Higher density for firmware storage; lacks SDP and battery-voltage flexibility. | Select when >64 Kbit capacity is required and system voltage is strictly 3.3V. |
| ON Semiconductor CAT28C64B-25 | Same 64 Kbit size, 250 ns access, 2.7–3.6V supply; hardware-only protection; SOIC-28 package. | Matches pinout and timing but omits software data protection and device ID area. | Choose for cost-sensitive designs where SDP is not mandated by safety standards. |
Compared with AT28BV64B-25SU, M28W640ECB90N6E offers higher density but sacrifices battery-voltage operation and SDP, while CAT28C64B-25 matches form-factor and voltage but lacks the 64-byte device ID area and robust software write lock.
Availability
AT28BV64B-25SU is available at Aetrix Electronics and suitable for industrial control systems, medical instrumentation, and automotive body electronics requiring stable component supply with long-term lifecycle support.
Supply support for AT28BV64B-25SU 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 product support, documentation, and manufacturing continuity for legacy Atmel memory devices.
The AT28BV64B-25SU belongs to Atmel's battery-voltage parallel EEPROM family, designed specifically for reliable nonvolatile storage in resource-constrained embedded systems with variable or low-voltage power rails.
FAQ
What is the maximum page write size supported by the AT28BV64B-25SU?
The AT28BV64B-25SU supports page write operations of 1 to 64 bytes within a single internal programming cycle. All bytes must reside on the same page, defined by address bits A6–A12. The device internally latches the address and data, freeing the bus after the first byte is loaded - enabling efficient burst programming without host timing overhead. This capability is fully implemented in the AT28BV64B-25SU and verified in its AC characteristics table (tBLC = 100 µs).
Does the AT28BV64B-25SU require external circuitry for write protection?
No, the AT28BV64B-25SU integrates both hardware and software data protection. Hardware protection includes VCC power-on delay (~10 ms), write inhibit via CE/OE/WE logic states, and noise filtering on control lines. Software Data Protection (SDP) mandates a three-byte unlock sequence (0xAA → 0x55 → 0xA0) before any write - a feature inherent to the AT28BV64B-25SU design and documented in its write algorithm flowchart.
Can the AT28BV64B-25SU operate reliably at 2.7V during read and write cycles?
Yes, the AT28BV64B-25SU is fully specified for 2.7V–3.6V operation across all modes. Its DC characteristics confirm active current ≤15 mA and standby current ≤50 µA at 2.7V (industrial range). AC timing parameters - including tACC = 250 ns max and tWC = 10 ms max - are guaranteed across this full voltage range, making the AT28BV64B-25SU suitable for battery-powered or brown-out-prone applications.
How is write completion detected on the AT28BV64B-25SU?
The AT28BV64B-25SU provides two independent, asynchronous methods: DATA polling on I/O7 (complement-to-true transition) and toggle-bit detection on I/O6 (repeated toggling until write completes). Both methods are functional throughout the entire write cycle and do not require fixed delays. These mechanisms are intrinsic to the AT28BV64B-25SU silicon and validated in sections 4.4 and 4.5 of its official datasheet.
Is the AT28BV64B-25SU pin-compatible with older 28-pin parallel EEPROMs?
Yes, the AT28BV64B-25SU uses a JEDEC-approved byte-wide pinout identical to industry-standard 28-pin parallel EEPROMs such as the 28C64. Its SOIC-28 (28S) package matches mechanical and electrical footprints, supporting direct replacement in existing designs without layout changes - provided voltage and timing margins align with the AT28BV64B-25SU's 2.7–3.6V and 250 ns specifications.
AT28BV64B-25SU 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:
- 250 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-25SU FAQ
1.How can I place an order for AT28BV64B-25SU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT28BV64B-25SU 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-25SU reliable?
The price and inventory of AT28BV64B-25SU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT28BV64B-25SU is usually 5 days.
3.What payment methods are accepted for AT28BV64B-25SU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT28BV64B-25SU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT28BV64B-25SU?
AT28BV64B-25SU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT28BV64B-25SU 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-25SU?
For technical support, including AT28BV64B-25SU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT28BV64B-25SU requirements.
6.How does Aetrix verify that AT28BV64B-25SU is sourced from the original manufacturer or authorized distributors?
All AT28BV64B-25SU 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-25SU meets industry standards.
7.What is the process for return or replacement of AT28BV64B-25SU?
All AT28BV64B-25SU units undergo pre-shipment inspection (PSI). If there is an issue with AT28BV64B-25SU, 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-25SU part is unused and in its original packaging.
Return procedure for AT28BV64B-25SU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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