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Microchip Technology AT28BV64-30TC
- Part No.:
- AT28BV64-30TC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
AT28BV64-30TC.pdf
- Description:
- IC EEPROM 64KBIT PARALLEL 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,009
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Product details
Overview
AT28BV64-30TC from Atmel is a 64K (8K × 8) parallel EEPROM designed for battery-powered systems, operating at 2.7V–3.6V with 300 ns read access time, 3 ms byte write cycle, and 50 µA CMOS standby current. It supports direct microprocessor control via READY/BUSY and DATA polling, and is qualified for industrial temperature range (−40°C to +85°C).
For engineers reviewing the AT28BV64-30TC datasheet, AT28BV64-30TC pinout, AT28BV64-30TC application, or AT28BV64-30TC equivalent, key selection considerations include its JEDEC-approved byte-wide interface, low-voltage write enable, VCC-sense write protection, and TSOP-28 packaging for space-constrained embedded designs.
Technical Context
The AT28BV64-30TC implements a static RAM-compatible parallel interface with dual-line chip select (CE/OE) and write enable (WE), enabling bus contention avoidance in multi-device systems. Its internal self-timed write controller clears and reprograms each byte autonomously after address/data latching.
It features two hardware-based write completion detection methods: open-drain RDY/BUSY output for system-level timing coordination and DATA polling on I/O7 for software-driven status checking. Internal error correction enhances endurance to 100,000 cycles and data retention to 10 years.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 64 Kbit (8,192 × 8) - provides nonvolatile storage for firmware boot code or configuration data in resource-limited controllers |
| Read Access Time | 300 ns - enables direct replacement of SRAM in legacy 8-bit microprocessor buses without wait-state insertion |
| Byte Write Cycle | 3 ms - defines minimum interval between successive byte writes; requires software polling or RDY/BUSY monitoring |
| Supply Voltage Range | 2.7V to 3.6V - supports single-supply operation from Li-ion or regulated 3.3V rails in portable equipment |
| Standby Current | 50 µA - minimizes quiescent power draw during sleep modes in battery-backed real-time clocks or sensors |
| Endurance | 100,000 write/erase cycles - suitable for infrequent parameter updates such as calibration offsets or user preferences |
| Temperature Range | −40°C to +85°C - meets industrial-grade environmental requirements for factory automation and metering |
Pinout & Package
AT28BV64-30TC is packaged in a 28-lead Plastic Thin Small Outline Package (TSOP), compliant with JEDEC standard MO-153, with 0.55 mm lead pitch and body dimensions 11.8 × 8.0 × 1.2 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A12 | Address Inputs | 13-bit address bus supporting full 8K-word decoding; compatible with Z80, 8051, and 68K family address mapping |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface; I/O7 used for DATA polling during write completion detection |
| CE | Chip Enable | Active-low device select; when high, places outputs in high-impedance state regardless of OE/WE state |
| OE | Output Enable | Active-low read control; enables data output only when CE is also low and WE is high |
| WE | Write Enable | Active-low write strobe; initiates byte latch and internal programming sequence on falling edge |
| RDY/BUSY | Open-Drain Status Output | Pulled low during write; released high at completion; supports wired-OR connection across multiple devices |
| VCC | Power Supply | 2.7V–3.6V logic supply; includes internal VCC-sense circuitry that inhibits writes below ~1.8V |
| GND | Ground Reference | Signal and power return path; decoupling capacitor required within 10 mm of VCC pin |
Key Features
| Feature | Design Value |
|---|---|
| DATA Polling Support | Enables software-driven write completion detection by reading complemented I/O7 until true data appears |
| READY/BUSY Open-Drain Output | Allows hardware synchronization of write operations across multiple EEPROMs without external logic |
| VCC-Sense Write Protection | Prevents inadvertent writes during power-up/down by disabling WE functionality until VCC exceeds 2.0V |
| JEDEC Byte-Wide Pinout | Ensures drop-in compatibility with industry-standard 28-pin parallel EEPROM sockets and PCB footprints |
| Internal Error Correction | Extends effective endurance and improves long-term data integrity in harsh thermal or radiation environments |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Memory |
|---|---|
Use Scenario: Storing field-adjustable parameters (e.g., sensor gain, alarm thresholds) in programmable logic controllers deployed in factory environments. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed during startup and runtime via 8-bit microcontroller bus. Use Value: 100,000-cycle endurance ensures reliable updates over 10+ years of scheduled maintenance cycles; −40°C to +85°C rating matches industrial ambient requirements. |
Use Scenario: Retaining calibrated sensor offsets and patient-specific settings in portable diagnostic instruments powered by rechargeable batteries. IC Role / Device Role / Timing Role: Low-power configuration store interfaced directly to an 8-bit MCU with no external level shifters or regulators. Use Value: 50 µA standby current extends battery life between charges; 2.7V–3.6V operation eliminates need for voltage translation in 3.3V systems. |
| Smart Meter Firmware Bootloader | Automotive Body Control Module NVM |
Use Scenario: Hosting secure bootloader code and cryptographic keys in utility smart meters requiring tamper-resistant, field-upgradable firmware storage. IC Role / Device Role / Timing Role: Parallel EEPROM mapped into microcontroller's external memory space for XIP-capable boot execution. Use Value: 300 ns read access allows zero-wait-state execution; 10-year data retention guarantees firmware integrity over product lifetime. |
Use Scenario: Storing vehicle-specific configuration (e.g., door lock behavior, lighting profiles) in body control units where ECU must retain settings after battery disconnect. IC Role / Device Role / Timing Role: Standalone nonvolatile memory interfaced to 8-bit automotive MCU via dedicated address/data bus. Use Value: VCC-sense write protection prevents corruption during ignition transients; industrial temp grade supports under-hood mounting near junction boxes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar parallel EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT28C64B-15PU | 5V-only operation (4.5V–5.5V); 150 ns access; PDIP-28 package; no RDY/BUSY pin | Requires 5V rail and external busy detection (e.g., timer-based polling); unsuitable for battery-powered 3.3V systems | Select only if legacy 5V design and faster access are prioritized over low-voltage operation and hardware status signaling. |
| M95640-DW DW | Serial SPI interface; 2.5V–5.5V supply; 5 ms write cycle; SO8 package; no parallel bus or RDY/BUSY | Reduces pin count but adds software overhead for serial protocol handling; incompatible with existing parallel address/data bus layouts | Choose when board space is constrained and MCU has SPI peripherals available; not a drop-in replacement for AT28BV64-30TC. |
Compared with AT28BV64-30TC, AT28C64B-15PU offers faster access but lacks low-voltage support and hardware busy signaling, while M95640-DW trades parallel simplicity for serial footprint reduction-neither matches the AT28BV64-30TC's combination of 3.3V operation, TSOP packaging, and dual-status feedback for industrial embedded use.
Availability
AT28BV64-30TC is available at Aetrix Electronics and suitable for industrial PLC configuration storage, medical device calibration memory, and smart meter firmware bootloader applications requiring stable component supply and long-term lifecycle assurance.
Supply support for AT28BV64-30TC 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 embedded systems.
The AT28BV64 series was designed as a low-voltage, high-reliability parallel EEPROM family targeting battery-operated and industrial control applications where robustness, long data retention, and simple microprocessor interfacing are critical.
FAQ
What is the maximum operating frequency supported by AT28BV64-30TC?
The AT28BV64-30TC does not operate at a clock frequency-it is a parallel asynchronous EEPROM. Its timing is defined by access and cycle parameters: tACC = 300 ns (address-to-output delay) and tWC = 3 ms (write cycle time). System timing depends on microprocessor bus speed and proper setup/hold times per AC specifications, not an internal clock.
Does AT28BV64-30TC support page writing or only byte-level writes?
AT28BV64-30TC supports only byte-level writes-not page or block writes. Each write operation programs one 8-bit location, requiring individual address and data setup followed by a full 3 ms internal programming cycle. There is no internal page buffer or accelerated multi-byte write mode.
Can AT28BV64-30TC be used in place of a standard SRAM without hardware changes?
AT28BV64-30TC can emulate SRAM for read operations (same CE/OE/WE timing), but write behavior differs fundamentally: writes require 3 ms and status monitoring via RDY/BUSY or DATA polling. Direct SRAM replacement is unsafe without firmware modifications to handle write latency and completion detection.
What is the purpose of the NC and DC pins on AT28BV64-30TC in TSOP package?
In the TSOP-28 package of AT28BV64-30TC, Pin 5 is labeled NC (No Connect) and must remain unconnected. Pins 14 and 27 are labeled DC (Don't Connect) and are internally unused test pads-these pins must also be left floating and not tied to VCC, GND, or any signal to ensure correct device operation and reliability.
How does the VCC-sense write protection function in AT28BV64-30TC?
AT28BV64-30TC incorporates internal VCC-sense circuitry that disables write functionality when VCC drops below approximately 1.8V. This prevents partial or corrupted writes during power brownouts or battery depletion. Once VCC rises above 2.0V, the device enforces a 10 ms power-on delay before accepting write commands.
AT28BV64-30TC 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:
- 3ms
- Access Time:
- 300 ns
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSOP
AT28BV64-30TC FAQ
1.How can I place an order for AT28BV64-30TC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT28BV64-30TC 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 AT28BV64-30TC reliable?
The price and inventory of AT28BV64-30TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT28BV64-30TC is usually 5 days.
3.What payment methods are accepted for AT28BV64-30TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT28BV64-30TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT28BV64-30TC?
AT28BV64-30TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT28BV64-30TC 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 AT28BV64-30TC?
For technical support, including AT28BV64-30TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT28BV64-30TC requirements.
6.How does Aetrix verify that AT28BV64-30TC is sourced from the original manufacturer or authorized distributors?
All AT28BV64-30TC 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 AT28BV64-30TC meets industry standards.
7.What is the process for return or replacement of AT28BV64-30TC?
All AT28BV64-30TC units undergo pre-shipment inspection (PSI). If there is an issue with AT28BV64-30TC, 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 AT28BV64-30TC part is unused and in its original packaging.
Return procedure for AT28BV64-30TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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