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Microchip Technology AT28BV64B-20TU
- Part No.:
- AT28BV64B-20TU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
AT28BV64B-20TU.pdf
- Description:
- IC EEPROM 64KBIT PARALLEL 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,276
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Product details
Overview
The AT28BV64B-20TU from Atmel is a 64K-bit (8K × 8) parallel EEPROM with battery-voltage operation (2.7V–3.6V), 200ns read access time, 10 ms max page write cycle, hardware/software data protection, and JEDEC-standard byte-wide pinout. It supports 1–64-byte page writes and operates across industrial temperature range (−40°C to +85°C) in a 28-lead TSOP package.
For engineers reviewing the AT28BV64B-20TU datasheet, AT28BV64B-20TU pinout, AT28BV64B-20TU application, or AT28BV64B-20TU equivalent, key selection criteria include its CMOS standby current (≤20 µA), DATA polling/toggle bit write completion detection, software data protection command sequence, and compatibility with static RAM-like interface timing.
Technical Context
The AT28BV64B-20TU implements a parallel EEPROM architecture with internal 64-byte page latches and an autonomous control timer for self-timed page writes. Its dual-line chip enable (CE) and output enable (OE) logic enables bus contention avoidance during mixed read/write operations.
Write operations require a three-byte software data protection (SDP) command sequence (0xAA→0x55→0xA0 at addresses 0x5555→0x2AAA→0x5555) before any byte or page write. Data integrity is reinforced by hardware features including VCC power-on delay (~10 ms), noise filtering on WE/CE (<15 ns pulse rejection), and write inhibit via OE high/CE high/WE high states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 64 Kbit (8,192 × 8), organized as byte-addressable parallel array |
| Supply Voltage | 2.7V to 3.6V - enables direct integration into 3.3V systems without level-shifting |
| Read Access Time | 200 ns - meets timing requirements for legacy microcontroller bus interfaces |
| Page Write Cycle | ≤10 ms - reduces firmware wait time vs. sector-erase flash in configuration storage |
| Endurance | 100,000 write cycles - suitable for infrequent parameter updates in industrial controllers |
| Data Retention | 10 years at 85°C - ensures long-term calibration or serial number persistence |
| Standby Current | ≤20 µA - minimizes quiescent power in battery-backed systems |
Pinout & Package
AT28BV64B-20TU is supplied in a 28-lead Plastic Thin Small Outline Package (TSOP), Type I, 8 mm × 13.4 mm body, compliant with JEDEC MO-183. Pin 1 identifier located at top-left corner with 0°–5° lead angle.
| 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 | Byte-wide parallel interface; I/O7 used for DATA polling, I/O6 for toggle-bit status monitoring |
| CE | Chip Enable | Active-low device select; must be low with OE low and WE high for read access |
| OE | Output Enable | Active-low output control; high impedance when high, enabling shared bus operation |
| WE | Write Enable | Active-low write strobe; falling edge latches address/data; controls SDP command entry and write initiation |
| VCC | Power Supply | 2.7V–3.6V supply input; includes internal power-on delay circuitry for write inhibition during ramp-up |
| GND | Ground Reference | Signal and power return path; decoupling required within 10 mm of VCC pin |
| NC | No Connect | Unbonded pins (positions 4, 13, 27 per TSOP drawing); must remain unconnected |
Key Features
| Feature | Design Value |
|---|---|
| Software Data Protection (SDP) | Three-byte unlock sequence prevents accidental writes during power transitions or firmware glitches |
| DATA Polling & Toggle Bit | Dual asynchronous write-completion detection methods eliminate need for fixed delay loops in host firmware |
| 64-byte Page Write | Reduces average write time per byte by >90% vs. individual byte writes; internal latching frees host bus |
| JEDEC Byte-wide Pinout | Drop-in replacement capability for legacy SRAM and EEPROM families in existing PCB layouts |
| Industrial Temperature Range | −40°C to +85°C operation validated per JEDEC JESD22-A108, supporting deployment in harsh environments |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Data |
|---|---|
Use Scenario: Storing user-configurable I/O mapping, scaling factors, and alarm thresholds in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed via parallel microcontroller bus during boot and runtime reconfiguration. Use Value: 100,000-cycle endurance ensures >10 years of field updates; 20 µA standby current extends backup battery life. | Use Scenario: Retaining factory-calibrated sensor offsets and gain coefficients in portable diagnostic equipment. IC Role / Device Role / Timing Role: Secure, tamper-resistant memory holding critical calibration parameters that must survive power loss and thermal cycling. Use Value: Software data protection prevents corruption during unexpected shutdown; 10-year data retention meets FDA regulatory requirements. |
| Automotive Body Control Module | Networking Equipment Bootloader Parameters |
Use Scenario: Saving seat/mirror position presets, lighting profiles, and door lock settings in vehicle body control units. IC Role / Device Role / Timing Role: Battery-backed nonvolatile memory interfaced directly to 8-bit MCU without external glue logic. Use Value: 2.7V–3.6V operation tolerates automotive battery voltage sag; JEDEC pinout simplifies migration from legacy EEPROMs. | Use Scenario: Storing MAC addresses, firmware version flags, and network interface configuration in Ethernet switches and routers. IC Role / Device Role / Timing Role: Parallel-access configuration store read during boot and updated only during firmware upgrades. Use Value: 200 ns read access enables zero-wait-state operation with 5 MHz bus clocks; page write reduces upgrade time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar parallel EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Microchip 28C64C-20/P | 5V-only supply (4.5V–5.5V); no software data protection; 250 ns access time | Lacks battery-voltage operation and SDP; requires level-shifting in 3.3V systems | Select only if legacy 5V design constraints prohibit voltage translation |
| ON Semiconductor CAT28C64B-20TE13 | Same 2.7V–3.6V supply and 200 ns access; no device ID area; slightly higher standby current (30 µA) | Missing 64-byte identification memory; identical functional interface and timing | Preferred where device ID tracking is unnecessary and cost sensitivity is high |
Compared with Microchip 28C64C-20/P, AT28BV64B-20TU enables direct 3.3V integration and secure writes; versus CAT28C64B-20TE13, it adds factory-traceable device identification memory without sacrificing speed or power.
Availability
AT28BV64B-20TU is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostics equipment, automotive body control modules, networking infrastructure, and embedded instrumentation requiring stable component supply over extended production lifecycles.
Supply support for AT28BV64B-20TU 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, specialized in high-reliability nonvolatile memory and microcontroller solutions for industrial, communications, and consumer applications.
The AT28BV64B product line delivers battery-voltage parallel EEPROMs optimized for systems requiring robust data retention, low-power operation, and drop-in compatibility with legacy SRAM-style interfaces.
FAQ
What is the operating voltage range for the AT28BV64B-20TU?
The AT28BV64B-20TU operates from 2.7V to 3.6V. This single-supply battery-voltage range eliminates the need for separate 5V rails or level shifters in modern 3.3V embedded systems. The device incorporates internal power-on delay circuitry that inhibits writes until VCC stabilizes above 1.8V, preventing corruption during power-up transients. All DC and AC specifications in the datasheet are guaranteed across this full voltage range.
How does software data protection work on the AT28BV64B-20TU?
The AT28BV64B-20TU requires a precise three-byte unlock sequence-writing 0xAA to address 0x5555, then 0x55 to 0x2AAA, then 0xA0 to 0x5555-before any write operation. This sequence must be repeated before every byte or page write. The AT28BV64B-20TU ignores data written without this sequence but still initiates internal timing, so reads during that period serve as polling. This mechanism prevents accidental writes during power fluctuations or firmware errors.
Can the AT28BV64B-20TU be used as a direct replacement for standard SRAM in existing designs?
The AT28BV64B-20TU uses a JEDEC-approved byte-wide pinout and behaves like static RAM during reads, making it compatible with many SRAM-based bus interfaces. However, write operations require the software data protection sequence and generate longer write cycles (up to 10 ms), so timing-critical SRAM write paths must be modified. The AT28BV64B-20TU is not a drop-in SRAM replacement but serves as a nonvolatile upgrade where data persistence is required.
What are the two methods to detect write completion on the AT28BV64B-20TU?
The AT28BV64B-20TU provides DATA polling (monitoring I/O7 for complemented data) and toggle bit detection (observing I/O6 toggling state) to signal write completion. Both methods operate asynchronously and can be initiated at any time during the write cycle. Once I/O7 returns true data or I/O6 stops toggling, the AT28BV64B-20TU is ready for the next access. These eliminate fixed delays and improve system responsiveness compared to timeout-based approaches.
Does the AT28BV64B-20TU include additional memory for device identification?
Yes, the AT28BV64B-20TU includes an extra 64 bytes of EEPROM accessible via A9 = 12V ± 0.5V and addresses 0x0000–0x003F. This dedicated area supports unique device serialization, manufacturing traceability, or calibration metadata storage independent of main memory. Standard read/write protocols apply, but the 12V programming voltage requirement mandates a dedicated charge pump or external HV source-unlike the main array which operates at VCC only.
AT28BV64B-20TU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 28-TSSOP (0.465", 11.80mm Width)
- Packaging:
- Tray
- 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-TSOP
AT28BV64B-20TU FAQ
1.How can I place an order for AT28BV64B-20TU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT28BV64B-20TU 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-20TU reliable?
The price and inventory of AT28BV64B-20TU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT28BV64B-20TU is usually 5 days.
3.What payment methods are accepted for AT28BV64B-20TU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT28BV64B-20TU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT28BV64B-20TU?
AT28BV64B-20TU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT28BV64B-20TU 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-20TU?
For technical support, including AT28BV64B-20TU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT28BV64B-20TU requirements.
6.How does Aetrix verify that AT28BV64B-20TU is sourced from the original manufacturer or authorized distributors?
All AT28BV64B-20TU 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-20TU meets industry standards.
7.What is the process for return or replacement of AT28BV64B-20TU?
All AT28BV64B-20TU units undergo pre-shipment inspection (PSI). If there is an issue with AT28BV64B-20TU, 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-20TU part is unused and in its original packaging.
Return procedure for AT28BV64B-20TU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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