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Microchip Technology AT27BV256-90JI
- Part No.:
- AT27BV256-90JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT27BV256-90JI.pdf
- Description:
- IC EPROM 256KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,773
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Product details
Overview
AT27BV256-90JI from Atmel is a 256K-bit (32K × 8) one-time programmable EPROM optimized for low-voltage battery-powered systems, featuring 90 ns read access time, dual supply operation (2.7–3.6 V or 4.5–5.5 V), and industrial temperature range (–40°C to +85°C). It delivers TTL-compatible outputs at 3.0 V and supports JEDEC-standard 28-pin SOIC, 28-pin TSOP, and 32-pin PLCC packages - ideal for portable instrumentation and embedded firmware storage.
For engineers reviewing the AT27BV256-90JI datasheet, AT27BV256-90JI pinout, AT27BV256-90JI application, or AT27BV256-90JI equivalent, key selection criteria include unregulated battery voltage support (2.7–3.6 V), rapid programming (100 µs/byte), CMOS/TTL I/O compatibility, 20 µA max standby current, and pin compatibility with AT27C256R in same package variants.
Technical Context
The AT27BV256-90JI implements a standard OTP EPROM architecture with two-line control (CE/OE), enabling bus contention avoidance in multi-device systems. Its dual-voltage design allows direct interface with both 3.3 V logic and legacy 5 V systems without level shifters.
It uses Atmel's Rapid™ Programming Algorithm with 100 µs CE pulses and on-chip product identification code (Manufacturer ID: 0x1E, Device ID: 0x8C) for automated programmer recognition. Programming requires VCC = 6.5 V and VPP = 13.0 V, while read mode operates safely within 2.7–3.6 V or 4.5–5.5 V ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32K × 8) - provides sufficient space for boot code or configuration data in compact embedded systems |
| Read Access Time | 90 ns max at VCC = 2.7–3.6 V - enables real-time firmware fetch in microcontroller-based peripherals |
| Supply Voltage Range | 2.7–3.6 V or 4.5–5.5 V - eliminates need for voltage regulation in battery-powered designs |
| Standby Current | 20 µA max at VCC = 3.6 V - extends battery life in always-on or sleep-mode applications |
| Programming Speed | 100 µs/byte typical - reduces production programming time versus conventional EPROMs |
| I/O Compatibility | CMOS and TTL compatible - interoperates with both 3.3 V and 5 V logic families without external buffers |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade deployment in harsh environments |
Pinout & Package
AT27BV256-90JI is supplied in a 28-lead 330-mil SOIC package (package code "R"), with pins arranged per JEDEC MS-012 standard. Pin 1 is index-marked; pin 28 is VCC, pin 14 is GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus supporting full 32K-word addressing; driven by MCU or FPGA address lines |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus; outputs valid only when CE = OE = low during read cycles |
| CE | Chip Enable | Active-low chip select; controls device activation and power state transition between active/standby |
| OE | Output Enable | Active-low output gate; enables data bus drivers independently of CE to manage bus sharing |
| VCC | Power Supply | Primary supply input (2.7–3.6 V or 4.5–5.5 V); requires local 0.1 µF ceramic decoupling capacitor |
| GND | Ground Reference | Signal and power return path; must be low-impedance connection to system ground plane |
| VPP | Programming Voltage | 13.0 V input during programming; must be isolated from VCC except during program/verify cycles |
| NC | No Connect | Pins marked NC (e.g., A12 in SOIC variant) are internally unused and must remain unconnected |
Key Features
| Feature | Design Value |
|---|---|
| Dual-Voltage Read Operation | Operates natively at 2.7–3.6 V or 4.5–5.5 V - removes need for LDO regulators in mixed-supply systems |
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time - cuts firmware update cycle time in manufacturing test |
| Integrated Product ID Code | Manufacturer ID 0x1E and Device ID 0x8C - enables automatic algorithm selection in universal programmers |
| JEDEC Pin Compatibility | Pin-for-pin compatible with AT27C256R in SOIC/TSOP/PLCC footprints - allows drop-in replacement in legacy designs |
| Low-Power Standby Mode | 20 µA max ICC in standby (CE high) - critical for energy-constrained battery-backed memory retention |
Applications
| Portable Medical Instrumentation | Industrial PLC Firmware Storage |
|---|---|
Use Scenario: Battery-powered handheld glucose meters requiring nonvolatile storage of calibration tables and firmware. IC Role / Device Role / Timing Role: OTP EPROM storing immutable boot code and sensor calibration data; accessed during power-up initialization. Use Value: Unregulated 2.7–3.6 V operation eliminates DC/DC converter, reducing BOM cost and board area while maintaining 90 ns read speed for fast startup. |
Use Scenario: Fixed-function programmable logic controllers deployed in factory automation with ambient temperatures up to 85°C. IC Role / Device Role / Timing Role: Nonvolatile firmware storage for ladder logic execution engine; read continuously during runtime. Use Value: Industrial temperature rating (–40°C to +85°C) and 20 µA standby current ensure reliable long-term operation in uncooled enclosures. |
| Legacy System BIOS Backup | Smart Meter Bootloader Storage |
Use Scenario: Retrofit upgrade of aging industrial PCs where original BIOS ROM is obsolete and unavailable. IC Role / Device Role / Timing Role: Drop-in replacement for AT27C256R in 28-pin SOIC socket; stores POST and hardware initialization routines. Use Value: JEDEC pin compatibility and identical programming protocol allow reuse of existing socket and programming infrastructure. |
Use Scenario: Electricity meters with tamper-resistant firmware requiring field-programmable but write-once boot code. IC Role / Device Role / Timing Role: Secure, one-time programmable storage for bootloader verification keys and secure boot sequence. Use Value: Rapid programming (100 µs/byte) and integrated ID code enable high-throughput, error-proof programming in meter calibration lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C256R-90JC | 5 V-only operation (4.5–5.5 V); no low-voltage mode; same 90 ns tACC and pinout | Requires regulated 5 V supply; unsuitable for battery-powered systems | Select when legacy 5 V system compatibility is mandatory and voltage regulation is already present |
| AT27LV256A-90JC | 3 V-only operation (2.7–3.6 V); lacks 5 V compatibility; identical programming algorithm and ID code | Cannot interface directly with 5 V logic without level translation | Select when strict 3 V system integration is required and 5 V host compatibility is unnecessary |
Compared with AT27C256R-90JC and AT27LV256A-90JC, the AT27BV256-90JI uniquely supports dual-voltage operation - enabling single-design reuse across both battery-powered and mains-powered platforms without hardware modification.
Availability
AT27BV256-90JI is available at Aetrix Electronics and suitable for portable instrumentation, industrial PLCs, legacy BIOS upgrades, and smart meter bootloader storage requiring stable component supply, long-lifecycle availability, and industrial temperature qualification.
Supply support for AT27BV256-90JI 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 was a U.S.-based semiconductor manufacturer specializing in microcontrollers, nonvolatile memory, and security ICs before its acquisition by Microchip Technology in 2016.
The AT27BV256-90JI belongs to Atmel's Battery-Voltage™ OTP EPROM family, engineered specifically for portable and mixed-supply embedded systems needing reliable, low-power, pin-compatible firmware storage without voltage regulation.
FAQ
What voltage ranges does the AT27BV256-90JI support during normal read operation?
The AT27BV256-90JI supports two distinct read voltage ranges: 2.7 V to 3.6 V for unregulated battery operation and 4.5 V to 5.5 V for standard 5 V systems. It does not operate reliably outside these ranges during read mode, and VPP must remain at VCC (not 13 V) during read cycles. This dual-range capability is intrinsic to the AT27BV256-90JI design and enables direct integration into both modern low-voltage and legacy 5 V platforms.
Is the AT27BV256-90JI pin-compatible with the AT27C256R in the same package?
Yes, the AT27BV256-90JI is explicitly pin-compatible with the JEDEC-standard AT27C256R in all supported packages (28-pin SOIC, 28-pin TSOP, and 32-pin PLCC). The pin functions, numbering, and timing behavior match exactly - allowing direct substitution in existing PCB layouts without redesign. This compatibility is confirmed in the official Atmel datasheet Rev. 0601B and applies specifically to the AT27BV256-90JI variant.
What is the maximum standby current specification for the AT27BV256-90JI?
The AT27BV256-90JI has a maximum standby current (ISB1) of 20 µA when VCC = 3.6 V and CE is held high (CMOS-level input). At lower VCC (e.g., 2.7 V), typical standby current drops below 1 µA. This value is measured under specified conditions in the datasheet's DC Operating Characteristics table and reflects actual quiescent draw - critical for estimating battery lifetime in always-on portable devices using the AT27BV256-90JI.
Does the AT27BV256-90JI require external capacitors, and if so, what values?
Yes, the AT27BV256-90JI requires a 0.1 µF ceramic capacitor placed between VCC and GND, as close to the device pins as possible, to suppress transient voltage excursions during CE transitions. During programming, an additional 0.1 µF capacitor is required between VPP and GND. These requirements are specified in the "System Considerations" section of the AT27BV256-90JI datasheet and are mandatory for reliable operation.
How does the Rapid™ Programming Algorithm work for the AT27BV256-90JI?
The Rapid™ Programming Algorithm for the AT27BV256-90JI uses 100 µs CE pulses at VCC = 6.5 V and VPP = 13.0 V. Each byte is first programmed once, then verified; failed bytes receive up to nine additional pulses with verification after each. The algorithm is implemented in the AT27BV256-90JI silicon and is fully compatible with standard AT27C256R programmers - no firmware changes are needed to program the AT27BV256-90JI.
AT27BV256-90JI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EPROM
- Technology:
- EPROM - OTP
- Memory Size:
- 256Kbit
- Memory Organization:
- 32K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- -
- Access Time:
- 90 ns
- Voltage - Supply:
- 2.7V ~ 3.6V, 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT27BV256-90JI FAQ
1.How can I place an order for AT27BV256-90JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27BV256-90JI 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 AT27BV256-90JI reliable?
The price and inventory of AT27BV256-90JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27BV256-90JI is usually 5 days.
3.What payment methods are accepted for AT27BV256-90JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27BV256-90JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27BV256-90JI?
AT27BV256-90JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27BV256-90JI 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 AT27BV256-90JI?
For technical support, including AT27BV256-90JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27BV256-90JI requirements.
6.How does Aetrix verify that AT27BV256-90JI is sourced from the original manufacturer or authorized distributors?
All AT27BV256-90JI 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 AT27BV256-90JI meets industry standards.
7.What is the process for return or replacement of AT27BV256-90JI?
All AT27BV256-90JI units undergo pre-shipment inspection (PSI). If there is an issue with AT27BV256-90JI, 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 AT27BV256-90JI part is unused and in its original packaging.
Return procedure for AT27BV256-90JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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