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Microchip Technology AT27BV256-90RI
- Part No.:
- AT27BV256-90RI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-SOIC (0.342", 8.69mm Width)
- Datasheet:
-
AT27BV256-90RI.pdf
- Description:
- IC EPROM 256KBIT PARALLEL 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,771
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Product details
Overview
AT27BV256-90RI 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 2.7–3.6V or 4.5–5.5V supply operation, and industrial temperature range (–40°C to +85°C). It delivers TTL-compatible outputs at 3.0V and supports LVBO interface compliance.
For engineers reviewing the AT27BV256-90RI datasheet, AT27BV256-90RI pinout, AT27BV256-90RI application, or AT27BV256-90RI equivalent, key selection criteria include unregulated battery voltage support, JEDEC-standard PLCC/SOIC/TSOP packaging, Rapid™ programming (100 µs/byte), 20 µA max standby current at 3.6V, and pin compatibility with AT27C256R.
Technical Context
The AT27BV256-90RI implements a CMOS OTP EPROM architecture with two-line control (CE/OE), enabling bus contention avoidance in shared-memory systems. Its dual-supply design supports both unregulated 2.7–3.6V battery rails and standard 5V ±10% operation without external level shifting.
It integrates an on-chip product identification code accessible via A9/VH and A0 toggling, ensuring algorithm-matched programming with industry-standard equipment. Programming requires VCC = 6.5V and VPP = 13.0V, with a verified 100 µs CE pulse width per byte and up to 10 reprogramming attempts per failed location.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32K × 8) - fixed OTP storage for firmware/boot code in space-constrained embedded systems |
| Read Access Time | 90 ns - enables direct execution from memory in 5 MHz microcontroller systems |
| Supply Voltage Range | 2.7–3.6V or 4.5–5.5V - eliminates need for voltage regulators in portable/battery-operated designs |
| Standby Current | 20 µA max at VCC = 3.6V - extends battery life in always-on or low-duty-cycle applications |
| Programming Speed | 100 µs/byte typical - reduces production programming time versus legacy 5V EPROMs |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade environmental robustness |
| ESD Protection | 2,000V HBM - enhances handling reliability during board assembly and field service |
Pinout & Package
AT27BV256-90RI is available in JEDEC-standard 28-lead SOIC (package code R), with pins arranged for drop-in compatibility with AT27C256R layouts. The SOIC package measures 0.330" wide and features gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus supporting full 32K-word addressing; CMOS/TTL compatible |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus; outputs drive TTL loads directly at 3.0V VCC |
| CE | Chip Enable | Active-low chip select; controls device activation and power state transitions |
| OE | Output Enable | Active-low output gate; enables high-impedance tri-state when deasserted |
| VCC | Power Supply | Primary supply input for read/standby modes; accepts 2.7–3.6V or 4.5–5.5V |
| VPP | Programming Voltage | 13.0V programming supply; must be applied after and removed before VCC |
| GND | Ground Reference | Common return path for all digital and power signals |
| NC | No Connect | Unbonded pins (A12, A13, A14 in SOIC variant); must remain floating |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time ensures high-throughput manufacturing without sacrificing reliability |
| Dual-Voltage Read Operation | Operates natively across 2.7–3.6V and 4.5–5.5V rails-no level shifters required for mixed-voltage system integration |
| Integrated Product ID Code | Manufacturer (0x1E) and device code (0x8C) readable via A9/VH and A0 toggle-enables automatic programmer configuration |
| JEDEC Pin Compatibility | Pin-for-pin identical to AT27C256R-allows legacy 5V designs to migrate to low-voltage operation with no PCB changes |
| Low-Power Standby Mode | 20 µA max ICC at 3.6V enables multi-year battery life in maintenance-free remote sensors and metering devices |
Applications
| Portable Medical Devices | Industrial PLC Modules |
|---|---|
Use Scenario: Firmware storage in handheld diagnostic tools powered by single-cell Li-ion batteries (2.7–4.2V). IC Role / Device Role / Timing Role: OTP EPROM storing boot loader and calibration tables; accessed during cold start and periodic self-test. Use Value: Unregulated 2.7–3.6V operation eliminates DC-DC converter, reducing BOM cost and board area while maintaining 90 ns read timing for deterministic boot sequence. | Use Scenario: Configuration memory in DIN-rail mounted I/O modules operating in factory environments with 5V backplane supplies. IC Role / Device Role / Timing Role: Nonvolatile storage for channel mapping, scaling coefficients, and firmware patches; read during module initialization. Use Value: Industrial temperature rating (–40°C to +85°C) and 2,000V ESD protection ensure reliable operation in electrically noisy plant-floor settings. |
| Smart Energy Meters | Avionics Data Recorders |
Use Scenario: Tamper-resistant firmware and tariff tables in ANSI C12.22-compliant electricity meters with backup coin-cell power. IC Role / Device Role / Timing Role: One-time programmable memory holding encrypted billing logic and metrology constants; read during meter wake-up cycles. Use Value: 20 µA max standby current extends 10-year coin-cell lifetime; OTP nature prevents unauthorized firmware modification post-deployment. | Use Scenario: Flight-critical boot code storage in black box recorders requiring DO-160E Section 22 lightning-induced transient immunity. IC Role / Device Role / Timing Role: Primary firmware image storage with guaranteed read integrity under rapid power cycling and voltage sags. Use Value: Dual-supply tolerance allows seamless operation during aircraft power transitions between 28V DC and auxiliary 5V sources without brownout resets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C256R-90JI | 5V-only operation (4.5–5.5V); no 2.7–3.6V support; same 90 ns speed and SOIC-28 package | Requires regulated 5V supply; unsuitable for battery-powered systems with unregulated rails | Select only if system uses stable 5V rail and legacy compatibility outweighs power efficiency needs |
| AT27LV256A-90JI | 3V-only operation (2.7–3.6V); lacks 5V mode; identical pinout and programming interface | Cannot interface directly with 5V TTL buses without level translation; limited to pure 3V systems | Choose when absolute minimum power consumption is critical and 5V host compatibility is unnecessary |
Compared with AT27C256R-90JI and AT27LV256A-90JI, the AT27BV256-90RI uniquely bridges dual-supply operation-supporting both battery-derived 3V and legacy 5V infrastructure-while retaining pin compatibility and Rapid™ programming, making it the sole option for mixed-voltage field-upgradable embedded systems.
Availability
AT27BV256-90RI is available at Aetrix Electronics and suitable for portable medical diagnostics, industrial PLCs, smart energy meters, avionics recorders, and battery-backed instrumentation requiring stable component supply across extended temperature ranges and long lifecycle commitments.
Supply support for AT27BV256-90RI 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 fabless semiconductor company specializing in microcontrollers, nonvolatile memory, and secure authentication ICs for industrial, automotive, and consumer applications.
The AT27BV256 product line was designed to enable battery-powered and mixed-voltage embedded systems with high-reliability OTP memory that eliminates voltage regulation overhead while maintaining JEDEC-standard interoperability.
FAQ
What voltage ranges does the AT27BV256-90RI support during normal read operation?
The AT27BV256-90RI supports two distinct read voltage ranges: 2.7V to 3.6V for unregulated battery operation and 4.5V to 5.5V for standard 5V systems. It does not operate reliably outside these ranges during read mode. Programming requires separate VCC = 6.5V and VPP = 13.0V supplies, as specified in the AC Programming Characteristics table.
Is the AT27BV256-90RI pin-compatible with the AT27C256R series?
Yes, the AT27BV256-90RI is fully JEDEC-standard pin-compatible with the AT27C256R family in all supported packages (SOIC-28, PLCC-32, TSOP-28). This includes identical pin functions, placement, and signal timing requirements, allowing direct replacement in existing PCB layouts without redesign.
What is the maximum standby current specification for the AT27BV256-90RI at 3.6V?
The maximum standby current for the AT27BV256-90RI is 20 µA at VCC = 3.6V, measured under CMOS-level CE disable conditions. Typical standby current is less than 1 µA at 3.0V, making it suitable for ultra-low-power applications where battery longevity is critical.
Does the AT27BV256-90RI require external decoupling capacitors, and if so, what values?
Yes, the AT27BV256-90RI requires a 0.1 µF ceramic capacitor placed between VCC and GND, located as close as possible to the device pins. For systems with multiple EPROMs, a 4.7 µF bulk electrolytic capacitor should also be added near the power entry point to stabilize the supply rail during switching transients.
How does the Rapid™ Programming Algorithm improve production throughput for the AT27BV256-90RI?
The Rapid™ Programming Algorithm reduces average programming time to 100 µs per byte-approximately 5× faster than conventional EPROM algorithms. It uses adaptive verification with up to 10 reprogramming pulses per failing location, ensuring high first-pass yield without sacrificing data retention integrity across the industrial temperature range.
AT27BV256-90RI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 28-SOIC (0.342", 8.69mm Width)
- 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:
- 28-SOIC
AT27BV256-90RI FAQ
1.How can I place an order for AT27BV256-90RI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27BV256-90RI 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 AT27BV256-90RI reliable?
The price and inventory of AT27BV256-90RI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27BV256-90RI is usually 5 days.
3.What payment methods are accepted for AT27BV256-90RI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27BV256-90RI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27BV256-90RI?
AT27BV256-90RI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27BV256-90RI 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 AT27BV256-90RI?
For technical support, including AT27BV256-90RI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27BV256-90RI requirements.
6.How does Aetrix verify that AT27BV256-90RI is sourced from the original manufacturer or authorized distributors?
All AT27BV256-90RI 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 AT27BV256-90RI meets industry standards.
7.What is the process for return or replacement of AT27BV256-90RI?
All AT27BV256-90RI units undergo pre-shipment inspection (PSI). If there is an issue with AT27BV256-90RI, 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 AT27BV256-90RI part is unused and in its original packaging.
Return procedure for AT27BV256-90RI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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