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Microchip Technology AT27BV256-70RI
- Part No.:
- AT27BV256-70RI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-SOIC (0.342", 8.69mm Width)
- Datasheet:
-
AT27BV256-70RI.pdf
- Description:
- IC EPROM 256KBIT PARALLEL 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,495
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Product details
Overview
AT27BV256-70RI from Atmel is a 256K-bit (32K × 8) one-time programmable EPROM optimized for low-voltage portable systems, featuring 70 ns read access time, dual-voltage operation (2.7–3.6V or 4.5–5.5V), and industrial temperature range (−40°C to +85°C). It delivers TTL-compatible outputs at 3.0V and supports unregulated battery power, making it ideal for handheld instrumentation and embedded firmware storage.
For engineers reviewing the AT27BV256-70RI datasheet, AT27BV256-70RI pinout, AT27BV256-70RI application, or AT27BV256-70RI equivalent, key selection criteria include its 70 ns access timing, 20 µA max standby current at 3.6V, JEDEC-standard 28-pin SOIC package, Rapid™ programming algorithm (100 µs/byte), and compatibility with AT27C256R-based designs.
Technical Context
The AT27BV256-70RI implements a CMOS OTP EPROM architecture with two-line control (CE/OE), enabling bus contention prevention in shared-memory systems. Its dual-voltage design allows seamless operation across 2.7–3.6V battery-powered and 4.5–5.5V legacy 5V systems without level-shifting.
It features integrated product identification code (Manufacturer ID = 0x1E, Device ID = 0x8C), rapid programming via 100 µs CE pulses at VCC = 6.5V/VPP = 13.0V, and robust ESD protection (2,000V) with latchup immunity (200 mA), ensuring reliability in industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32K × 8) - supports full 8-bit data bus interface without address multiplexing |
| Read Access Time | 70 ns - enables direct connection to microcontrollers with ≤14 MHz bus clocks |
| Supply Voltage Range | 2.7V–3.6V or 4.5V–5.5V - eliminates need for voltage regulators in battery-powered designs |
| Standby Current | 20 µA max at 3.6V - extends battery life in always-on embedded systems |
| Active Power Dissipation | 29 mW max at 5 MHz / 3.6V - reduces thermal load in dense PCB layouts |
| Programming Speed | 100 µs/byte typical - cuts firmware update time vs. standard 5V EPROMs |
| Operating Temperature | −40°C to +85°C - qualified for industrial control and automotive under-hood applications |
Pinout & Package
AT27BV256-70RI is supplied in a 28-lead 330-mil SOIC (package code 28R), JEDEC-compliant surface-mount package measuring 17.9 mm × 7.6 mm × 2.3 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus supporting full 32K-word addressing; TTL/CMOS 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 standby entry |
| OE | Output Enable | Active-low output gate; enables data bus drivers independently of CE |
| VCC | Power Supply | Primary supply input; accepts 2.7–3.6V or 4.5–5.5V; requires 0.1 µF ceramic decoupling |
| VPP | Programming Voltage | 13.0V programming supply; must be applied after and removed before VCC |
| GND | Ground | Reference return path; requires low-inductance connection to minimize noise during programming |
| NC | No Connect | Pins 1, 17 in PLCC variant only; not present in SOIC package used by AT27BV256-70RI |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time reduces firmware burn-in cycle duration by >5× vs. legacy EPROMs |
| Dual-Voltage Read Operation | Operates natively at 2.7–3.6V or 4.5–5.5V - avoids external regulators or level shifters in mixed-supply systems |
| Integrated Product ID Code | Manufacturer ID (0x1E) and Device ID (0x8C) enable automatic algorithm selection in industry-standard programmers |
| JEDEC Pin Compatibility | Pinout matches AT27C256R - allows drop-in replacement in existing 5V designs with no PCB changes |
| Battery-Voltage™ Architecture | Stable 70 ns access at 2.7V VCC - supports direct connection to lithium primary cells without regulation |
Applications
| Portable Data Loggers | Industrial PLC Firmware Storage |
|---|---|
Use Scenario: Battery-powered environmental sensor nodes recording temperature/humidity at 1-second intervals for 6+ months. IC Role / Device Role / Timing Role: Nonvolatile firmware and calibration table storage; accessed only on boot and configuration updates. Use Value: 20 µA max standby current extends CR2032 battery life beyond 7 months; 70 ns access ensures fast boot from cold start. |
Use Scenario: Modular programmable logic controllers requiring field-upgradable ladder logic firmware in factory automation cabinets. IC Role / Device Role / Timing Role: Read-only program memory mapped to CPU address space; accessed sequentially during scan execution. Use Value: −40°C to +85°C rating ensures reliable operation inside uncooled control panels; dual-voltage support simplifies global deployment across 3.3V and 5V controller variants. |
| Medical Handheld Diagnostics | Automotive Body Control Modules |
Use Scenario: FDA-cleared point-of-care blood glucose meters with user-updatable calibration algorithms and regulatory audit logs. IC Role / Device Role / Timing Role: Secure, tamper-resistant firmware storage; programmed once at manufacturing and never rewritten in field. Use Value: OTP architecture prevents accidental or malicious firmware corruption; 2,000V ESD protection withstands clinical handling discharge events. |
Use Scenario: Under-dash BCMs managing door locks, lighting, and window motors in vehicles operating across desert and arctic climates. IC Role / Device Role / Timing Role: Boot ROM containing initialization routines and CAN message handlers; accessed during power-on reset sequence. Use Value: Industrial temperature range guarantees startup at −40°C ambient; TTL-level outputs interface directly with 5V microcontroller buses without level translation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C256R-70PC | 5V-only operation (4.5–5.5V); no low-voltage mode; 70 ns access; same 28-pin DIP/SOIC footprint | Requires regulated 5V supply; unsuitable for battery-powered systems | Select when legacy 5V board space and power infrastructure already exist and battery operation is unnecessary |
| M27C256B-12F1 | 120 ns access time; 5V-only; higher standby current (100 µA); same 28-pin SOIC package | Limited to lower-speed microcontrollers; higher power draw reduces battery runtime | Choose only if cost sensitivity outweighs speed and power requirements, and 120 ns timing meets system constraints |
Compared with AT27BV256-70RI, AT27C256R-70PC lacks battery-voltage operation but offers identical pinout and programming compatibility, while M27C256B-12F1 trades 50 ns slower access and 5× higher standby current for lower unit cost in non-portable applications.
Availability
AT27BV256-70RI is available at Aetrix Electronics and suitable for portable instrumentation, industrial PLC firmware storage, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AT27BV256-70RI 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 innovator specializing in microcontrollers, nonvolatile memory, and secure authentication ICs for industrial, automotive, and consumer applications.
The AT27BV256 product line was designed specifically for battery-powered and dual-supply embedded systems needing high-speed, low-power OTP memory with JEDEC-standard compatibility and robust programming reliability.
FAQ
What is the maximum operating voltage for AT27BV256-70RI during normal read operation?
The AT27BV256-70RI supports two distinct read voltage ranges: 2.7V to 3.6V for low-voltage/battery operation and 4.5V to 5.5V for standard 5V systems. It must not be operated outside these ranges during read mode; exceeding 5.5V risks permanent damage per absolute maximum ratings.
Does AT27BV256-70RI require external capacitors, and if so, what values?
Yes - AT27BV256-70RI requires a 0.1 µF ceramic capacitor placed between VCC and GND, mounted as close as possible to the device pins. This suppresses transient voltage excursions during CE transitions. For arrays with multiple devices, a 4.7 µF bulk electrolytic capacitor is also recommended near the power entry point.
Can AT27BV256-70RI be programmed using standard AT27C256R programming equipment?
Yes - AT27BV256-70RI uses the same Rapid™ programming algorithm and pinout as AT27C256R. It programs identically with VCC = 6.5V and VPP = 13.0V, and shares the same Integrated Product Identification Code (0x1E/0x8C), enabling full compatibility with industry-standard EPROM programmers.
What is the meaning of the 'RI' suffix in AT27BV256-70RI?
The 'RI' suffix denotes the industrial temperature grade (−40°C to +85°C) and 28-lead SOIC package (28R). The '70' indicates 70 ns maximum access time, and 'I' confirms industrial qualification - distinct from 'JC' (commercial DIP) or 'TI' (industrial TSOP) variants.
Is AT27BV256-70RI suitable for use with 3.3V microcontrollers without level shifting?
Yes - AT27BV256-70RI produces TTL-compatible outputs at VCC = 3.0V, meeting VOH ≥ 2.4V and VOL ≤ 0.4V specifications into 2.0 mA loads. This allows direct interfacing with 3.3V microcontrollers that accept TTL input thresholds, eliminating external level translators.
AT27BV256-70RI 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:
- 70 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
AT27BV256-70RI FAQ
1.How can I place an order for AT27BV256-70RI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27BV256-70RI 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 AT27BV256-70RI reliable?
The price and inventory of AT27BV256-70RI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27BV256-70RI is usually 5 days.
3.What payment methods are accepted for AT27BV256-70RI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27BV256-70RI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27BV256-70RI?
AT27BV256-70RI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27BV256-70RI 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 AT27BV256-70RI?
For technical support, including AT27BV256-70RI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27BV256-70RI requirements.
6.How does Aetrix verify that AT27BV256-70RI is sourced from the original manufacturer or authorized distributors?
All AT27BV256-70RI 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 AT27BV256-70RI meets industry standards.
7.What is the process for return or replacement of AT27BV256-70RI?
All AT27BV256-70RI units undergo pre-shipment inspection (PSI). If there is an issue with AT27BV256-70RI, 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 AT27BV256-70RI part is unused and in its original packaging.
Return procedure for AT27BV256-70RI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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