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Microchip Technology AT28BV64B-25SC
- Part No.:
- AT28BV64B-25SC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AT28BV64B-25SC.pdf
- Description:
- IC EEPROM 64KBIT PARALLEL 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,274
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Product details
Overview
AT28BV64B-25SC 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, and is widely used in industrial control systems for nonvolatile parameter storage.
For engineers reviewing the AT28BV64B-25SC datasheet, AT28BV64B-25SC pinout, AT28BV64B-25SC application, or AT28BV64B-25SC equivalent, key selection considerations include its JEDEC byte-wide parallel interface, 20 µA CMOS standby current, 100,000 write endurance, 10-year data retention, and software data protection (SDP) command sequence requirement.
Technical Context
The AT28BV64B-25SC 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 for concurrent operations.
Write completion is verified via I/O7 DATA polling (complement-to-data behavior) or I/O6 toggle-bit monitoring-both usable at any point during the internal 10 ms max write cycle. Software Data Protection requires a mandatory three-byte command sequence (0xAA → 0x55 → 0xA0) before each write operation.
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 maximum; enables direct replacement of SRAM in legacy 8-bit microcontroller address/data bus systems. |
| Page Write Cycle | ≤10 ms; allows burst programming of up to 64 bytes without host timing overhead beyond tBLC (100 µs inter-byte window). |
| 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 without refresh in unpowered storage scenarios. |
| Supply Voltage | 2.7V–3.6V; compatible with 3.3V logic systems and tolerant of brown-out conditions common in battery-backed applications. |
| Standby Current | 20 µA (CMOS, commercial temp); minimizes quiescent power draw in always-on monitoring devices. |
Pinout & Package
AT28BV64B-25SC is packaged in a 28-lead, 0.300" wide plastic gull-wing small outline (SOIC) per JEDEC MS-013, with JEDEC-standard byte-wide parallel pinout and no internal pull-ups.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A12 | Address Inputs | 13-bit address bus supporting full 8K-word addressing; A6–A12 define page boundaries for 64-byte page writes. |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel data path; I/O7 provides DATA polling status, I/O6 provides toggle-bit write-complete indication. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for read access; controls device selection in multi-chip memory maps. |
| OE | Output Enable | Active-low output control; used with CE to gate data outputs and avoid bus contention during shared-bus operation. |
| WE | Write Enable | Active-low write strobe; initiates byte or page write when CE is low and OE is high; triggers SDP command validation. |
| VCC / GND | Power Supply | Single 2.7V–3.6V supply; no VPP or auxiliary voltage required-simplifies power design versus older EEPROM families. |
Key Features
| Feature | Design Value |
|---|---|
| Software Data Protection (SDP) | Mandatory 3-byte unlock sequence (0xAA/0x55/0xA0) prevents accidental writes during power transitions or noise events. |
| Page Write with Internal Latching | 64-byte page register frees address/data bus after initial latch-enables host CPU to perform other tasks during 10 ms internal write. |
| DATA Polling & Toggle Bit | Dual asynchronous write-completion detection methods eliminate need for fixed delay timing or external polling loops. |
| JEDEC Byte-Wide Pinout | Drop-in compatibility with legacy 27C64/28C64 sockets and PCB layouts-no redesign needed for migration from UV-EPROM or earlier EEPROMs. |
| Extra 64-Byte ID Area | User-accessible identification space (7FC0H–7FFFH) accessible via 12V on A9-supports unique device serialization or calibration metadata storage. |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Data |
|---|---|
|
Use Scenario: Storing user-configurable I/O mapping, PID tuning parameters, and alarm thresholds in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter store accessed via 8-bit microcontroller parallel bus during boot or runtime reconfiguration. Use Value: Ensures settings survive power loss; 100,000-cycle endurance supports frequent field updates without wear-out concerns. |
Use Scenario: Retaining sensor calibration coefficients, usage counters, and regulatory audit logs in portable diagnostic instruments. IC Role / Device Role / Timing Role: Secure, low-power configuration memory interfaced to an ARM Cortex-M0+ MCU with strict data integrity requirements. Use Value: 10-year data retention at 85°C guarantees calibration validity across device lifetime; SDP prevents corruption during battery swaps. |
| Automotive Body Control Module (BCM) | Networking Equipment Bootloader Settings |
|
Use Scenario: Saving seat/mirror position presets, lighting profiles, and fault history in automotive BCMs operating across -40°C to +85°C. IC Role / Device Role / Timing Role: Industrial-temperature EEPROM directly connected to 8051-based BCM controller via parallel bus. Use Value: 20 µA standby current extends battery drain survival time; green (Pb/halide-free) SOIC package meets automotive RoHS compliance. |
Use Scenario: Holding MAC address, firmware version flags, and network interface configuration in managed Ethernet switches. IC Role / Device Role / Timing Role: Boot-time configuration store accessed by MIPS-based switch controller before initializing PHYs and packet engines. Use Value: 250 ns read access enables fast bootloader initialization; JEDEC pinout allows reuse of existing PCB footprints from legacy 28C64 designs. |
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 (8M × 8), 90 ns access, 3.3V-only, no SDP; requires external VPP for write. | Higher density but incompatible pinout and voltage; suited for new designs needing faster access and larger capacity. | Select only if migrating to higher-density parallel EEPROM and redesigning PCB layout and firmware timing. |
| ON Semiconductor CAT28C64B-25SC | Same 64 Kbit size, 250 ns access, 2.7–3.6V, JEDEC pinout, but lacks software data protection and 64-byte ID area. | Drop-in pin-and-function replacement where SDP is not required and ID space is unused. | Prefer when cost sensitivity outweighs need for write-protection robustness or device serialization capability. |
Compared with AT28BV64B-25SC, the ST M28W640ECB90N6E offers higher speed and density but demands board-level changes and loses SDP safety; the CAT28C64B-25SC matches footprint and timing but omits critical data integrity features essential for field-updatable systems.
Availability
AT28BV64B-25SC is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostics equipment, and automotive body control modules requiring stable component supply, long-life data retention, and proven field reliability.
Supply support for AT28BV64B-25SC 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 documentation, qualification, and long-term supply assurance.
The AT28BV64B product line was designed for industrial and automotive applications requiring robust, low-voltage parallel EEPROM with integrated write protection and page-write efficiency.
FAQ
What is the maximum write cycle time for AT28BV64B-25SC?
The AT28BV64B-25SC has a maximum page write cycle time of 10 ms. This applies to all page write operations (1–64 bytes). The device uses an internal control timer to complete the write autonomously once initiated, freeing the host bus. Byte writes follow the same timing envelope but are less efficient than page writes for multi-byte updates.
Does AT28BV64B-25SC require a high-voltage programming signal?
No, AT28BV64B-25SC operates from a single 2.7V–3.6V supply and does not require VPP or any external high-voltage signal for normal read/write operations. Only the optional 64-byte device identification area (7FC0H–7FFFH) requires 12.0V ± 0.5V applied to A9-standard memory operations use only VCC.
How does software data protection work on AT28BV64B-25SC?
AT28BV64B-25SC enforces Software Data Protection (SDP) via a mandatory three-byte unlock sequence: write 0xAA to address 0x5555, then 0x55 to address 0x2AAA, then 0xA0 to address 0x5555. Only after this sequence is correctly executed will subsequent write commands be accepted. Without it, write attempts trigger internal timers but do not alter memory.
Can AT28BV64B-25SC be used as a direct replacement for older 28C64 EEPROMs?
Yes, AT28BV64B-25SC uses a JEDEC-approved byte-wide pinout and matches the 28-pin SOIC footprint of legacy 28C64 devices. Its 250 ns access time, 2.7–3.6V supply, and static RAM-like interface allow drop-in replacement-though firmware must implement the SDP unlock sequence absent in earlier parts.
What temperature range does the 'SC' suffix indicate for AT28BV64B-25SC?
The 'SC' suffix in AT28BV64B-25SC denotes a 28-lead SOIC package rated for the commercial temperature range (0°C to +70°C). This differs from 'SI' (industrial, –40°C to +85°C) and 'TC'/'TI' (TSOP variants). All versions share identical electrical specifications except for thermal qualification limits.
AT28BV64B-25SC 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:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOIC
AT28BV64B-25SC FAQ
1.How can I place an order for AT28BV64B-25SC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT28BV64B-25SC 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-25SC reliable?
The price and inventory of AT28BV64B-25SC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT28BV64B-25SC is usually 5 days.
3.What payment methods are accepted for AT28BV64B-25SC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT28BV64B-25SC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT28BV64B-25SC?
AT28BV64B-25SC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT28BV64B-25SC 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-25SC?
For technical support, including AT28BV64B-25SC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT28BV64B-25SC requirements.
6.How does Aetrix verify that AT28BV64B-25SC is sourced from the original manufacturer or authorized distributors?
All AT28BV64B-25SC 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-25SC meets industry standards.
7.What is the process for return or replacement of AT28BV64B-25SC?
All AT28BV64B-25SC units undergo pre-shipment inspection (PSI). If there is an issue with AT28BV64B-25SC, 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-25SC part is unused and in its original packaging.
Return procedure for AT28BV64B-25SC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT28BV64B-25SC Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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M24C02-FMC6TG
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AT24CS02-SSHM-T
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93LC46BT-I/OT
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AT24C04C-SSHM-T
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24LC01BT-I/SN
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