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Microchip Technology AT27BV256-90RC
- Part No.:
- AT27BV256-90RC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-SOIC (0.342", 8.69mm Width)
- Datasheet:
-
AT27BV256-90RC.pdf
- Description:
- IC EPROM 256KBIT PARALLEL 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,001
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Product details
Overview
AT27BV256-90RC 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 JEDEC-standard 28-lead SOIC packaging. It serves as nonvolatile program storage in portable instrumentation, embedded controllers, and legacy system upgrades where pin compatibility with AT27C256R is required.
For engineers reviewing the AT27BV256-90RC datasheet, AT27BV256-90RC pinout, AT27BV256-90RC application, or AT27BV256-90RC equivalent, key selection criteria include unregulated battery voltage support (2.7–3.6V), rapid 100 µs/byte programming, <1 µA typical standby current at 3V, TTL/LVBO interface compatibility, and industrial temperature range (-40°C to +85°C).
Technical Context
The AT27BV256-90RC implements a CMOS OTP EPROM architecture with two-line control (CE/OE), enabling bus contention avoidance in shared-memory systems. Its dual-voltage design supports both unregulated battery rails and standard 5V hosts without level-shifting circuitry.
It uses Atmel's Rapid™ Programming Algorithm requiring VCC = 6.5V and VPP = 13.0V during programming, with integrated product identification code (Manufacturer ID: 0x1E, Device ID: 0x8C) for automated programmer recognition. Output drive meets LVTTL and LVBO specifications across its full operating voltage range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32K × 8) - fixed OTP storage capacity for firmware or configuration data |
| Read Access Time | 90 ns max - guarantees deterministic timing for 5 MHz bus operation in real-time systems |
| Supply Voltage Range | 2.7V–3.6V or 4.5V–5.5V - eliminates need for voltage regulation in battery-powered designs |
| Standby Current | 20 µA max at 3.6V - extends battery life in always-on or sleep-mode applications |
| Programming Speed | 100 µs/byte typical - reduces production programming cycle time vs. legacy 5V EPROMs |
| Operating Temperature | -40°C to +85°C - qualified for industrial-grade embedded deployment |
| Package Type | 28-lead SOIC (330-mil width) - surface-mount compatible with standard PCB assembly processes |
Pinout & Package
AT27BV256-90RC is supplied in a 28-lead, 0.330" wide plastic gull-wing small outline integrated circuit (SOIC) package per JEDEC MS-012AA. Pin 1 is marked by a notch or dot; leads are spaced at 0.050" pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus accepting 0–32767 for full memory space access |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus delivering stored byte on valid read cycles |
| CE | Chip Enable | Active-low chip select; disables outputs and reduces current when high |
| OE | Output Enable | Active-low output gate; controls data bus tristate independently of CE |
| VPP | Programming Voltage | 13.0V input required only during programming; must be sequenced with VCC |
| VCC | Power Supply | Primary supply rail supporting dual-voltage operation (2.7–3.6V or 4.5–5.5V) |
| GND | Ground Reference | Common return path for all signals and power domains |
Key Features
| Feature | Design Value |
|---|---|
| Unregulated Battery-Voltage™ Operation | Supports direct connection to lithium or alkaline batteries without regulation, simplifying power architecture |
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time with automatic verify/reprogram loop ensures production yield |
| Integrated Product Identification Code | Electronic ID (0x1E/0x8C) enables plug-and-play recognition by industry-standard programmers |
| JEDEC Pin Compatibility | Direct drop-in replacement for AT27C256R in existing 28-pin SOIC footprints, reducing redesign effort |
| LVBO and LVTTL Interface Compliance | Valid logic levels at 2.7V (LVBO) and 5V (LVTTL) allow interoperability with mixed-voltage systems |
Applications
| Portable Medical Instrumentation | Industrial PLC Firmware Storage |
|---|---|
Use Scenario: Handheld blood glucose meters and portable ECG monitors using coin-cell or AA batteries. IC Role / Device Role / Timing Role: Nonvolatile storage for calibration tables and firmware boot code with guaranteed 90 ns read latency. Use Value: Eliminates external voltage regulators and extends battery life via sub-1 µA standby current at 3V. |
Use Scenario: Modular programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Storing ladder logic firmware and I/O configuration maps in ruggedized enclosures. Use Value: Industrial temperature rating (-40°C to +85°C) and 2,000V ESD protection ensure reliability in electrically noisy plants. |
| Legacy System ROM Replacement | Embedded Controller Boot Memory |
Use Scenario: Upgrading aging test equipment and telecom line cards originally designed for AT27C256R. IC Role / Device Role / Timing Role: Pin- and function-compatible OTP EPROM replacement preserving original PCB layout. Use Value: Enables migration to lower-power, battery-friendly operation without hardware revision. |
Use Scenario: Microcontroller-based smart sensors requiring secure, tamper-resistant boot code storage. IC Role / Device Role / Timing Role: Primary boot ROM accessed at power-up before RAM initialization. Use Value: Rapid programming and integrated ID code streamline manufacturing programming and traceability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C256R-90RC | 5V-only operation (4.5–5.5V); no 2.7–3.6V support; identical pinout and timing | Requires regulated 5V supply; unsuitable for battery-powered systems | Select when legacy 5V infrastructure exists and low-voltage operation is unnecessary |
| AT27LV256A-90RC | 3V-only operation (2.7–3.6V); lacks 5V compatibility; same Rapid™ programming and ID code | Cannot interface directly with 5V TTL buses without level shifters | Select when system operates exclusively at 3V and maximum power savings are critical |
Compared with AT27C256R-90RC and AT27LV256A-90RC, the AT27BV256-90RC uniquely bridges dual-supply systems-supporting both unregulated battery rails and 5V hosts-while retaining full programming and pin compatibility with both alternatives.
Availability
AT27BV256-90RC is available at Aetrix Electronics and suitable for portable instrumentation, industrial control systems, and legacy system upgrades requiring stable component supply, long-term lifecycle assurance, and JEDEC-standard SOIC packaging.
Supply support for AT27BV256-90RC 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 security ICs for embedded and industrial applications.
The AT27BV256-90RC belongs to Atmel's Battery-Voltage™ OTP EPROM product line, engineered specifically for portable and mixed-voltage systems needing reliable, low-power, field-programmable ROM without external regulation.
FAQ
What voltage ranges does the AT27BV256-90RC support during normal read operation?
The AT27BV256-90RC supports two distinct read-mode supply ranges: 2.7V to 3.6V for unregulated battery applications and 4.5V to 5.5V for standard 5V systems. Both ranges are fully specified for AC and DC parameters including 90 ns access time and TTL/LVBO output compatibility. The AT27BV256-90RC must not be operated outside these ranges during read cycles.
Is the AT27BV256-90RC pin-compatible with the AT27C256R?
Yes, the AT27BV256-90RC is explicitly designed to be JEDEC pin-compatible with the AT27C256R across all supported packages, including the 28-lead SOIC variant. This allows direct PCB-level replacement without layout changes. The AT27BV256-90RC retains identical pin functions, address/data mapping, and control signal behavior-only supply voltage flexibility and lower power consumption differ.
What programming voltage and sequence are required for the AT27BV256-90RC?
The AT27BV256-90RC requires VCC = 6.5V ± 0.25V and VPP = 13.0V ± 0.25V during programming, with VCC applied simultaneously with or before VPP and removed simultaneously with or after VPP. A 0.1 µF ceramic capacitor must be placed between VPP and GND. The AT27BV256-90RC uses the Rapid™ algorithm with 100 µs CE pulses and built-in verify loops.
Does the AT27BV256-90RC support industrial temperature operation?
Yes, the AT27BV256-90RC is qualified for industrial temperature operation from -40°C to +85°C, as confirmed by the "I" suffix in ordering codes (e.g., AT27BV256-90RI). This rating applies to all electrical specifications including 90 ns access time, standby current, and programming reliability-making the AT27BV256-90RC suitable for harsh-environment deployments.
How does the AT27BV256-90RC achieve compatibility with both 3V and 5V logic interfaces?
The AT27BV256-90RC achieves dual-interface compatibility through JEDEC-compliant input thresholds and output drive strength: at VCC = 2.7–3.6V, it meets LVBO specifications; at VCC = 4.5–5.5V, it meets LVTTL levels. Its outputs drive to VCC − 0.1V (at 20 µA) and sink 2.0 mA while maintaining VOL ≤ 0.4V-ensuring interoperability with both 3V and 5V systems without external level shifters. This behavior is intrinsic to the AT27BV256-90RC's design.
AT27BV256-90RC 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:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOIC
AT27BV256-90RC FAQ
1.How can I place an order for AT27BV256-90RC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27BV256-90RC 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 AT27BV256-90RC reliable?
The price and inventory of AT27BV256-90RC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27BV256-90RC is usually 5 days.
3.What payment methods are accepted for AT27BV256-90RC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27BV256-90RC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27BV256-90RC?
AT27BV256-90RC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27BV256-90RC 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 AT27BV256-90RC?
For technical support, including AT27BV256-90RC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27BV256-90RC requirements.
6.How does Aetrix verify that AT27BV256-90RC is sourced from the original manufacturer or authorized distributors?
All AT27BV256-90RC 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 AT27BV256-90RC meets industry standards.
7.What is the process for return or replacement of AT27BV256-90RC?
All AT27BV256-90RC units undergo pre-shipment inspection (PSI). If there is an issue with AT27BV256-90RC, 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 AT27BV256-90RC part is unused and in its original packaging.
Return procedure for AT27BV256-90RC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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