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Microchip Technology AT27BV256-15RI
- Part No.:
- AT27BV256-15RI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-SOIC (0.342", 8.69mm Width)
- Datasheet:
-
AT27BV256-15RI.pdf
- Description:
- IC EPROM 256KBIT PARALLEL 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,217
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Product details
Overview
AT27BV256-15RI from Atmel is a 256K-bit (32K × 8) one-time programmable EPROM optimized for low-voltage battery-powered systems, featuring 70 ns read access time at 2.7–3.6 V, dual-voltage operation (2.7–3.6 V or 4.5–5.5 V), and industrial temperature range (−40°C to +85°C). It delivers 8 mA active current at 5 MHz and <20 µA standby current, enabling portable embedded firmware storage with JEDEC-standard pinout compatibility.
For engineers reviewing the AT27BV256-15RI datasheet, AT27BV256-15RI pinout, AT27BV256-15RI application, or AT27BV256-15RI equivalent, this page provides verified package mapping (28-lead SOIC), confirmed Rapid™ programming algorithm (100 µs/byte), TTL/LVBO interface compatibility, ESD/latchup robustness, and real-world system integration guidance for battery-backed memory designs.
Technical Context
The AT27BV256-15RI implements a CMOS OTP EPROM architecture with two-line control (CE/OE), supporting fast random-access reads and rapid byte-level programming using VPP = 13.0 V and VCC = 6.5 V. Its dual-supply design enables seamless interoperability between 3.3 V logic domains and legacy 5 V systems without level-shifting.
It features integrated product identification code (Manufacturer ID = 0x1E, Device ID = 0x8C), programmable via A9 high-voltage select and A0 toggle, ensuring automatic algorithm selection in industry-standard programmers. The device uses standard JEDEC-compliant timing waveforms and requires 0.1 µF ceramic decoupling per VCC/VPP pair to suppress transients during CE transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32K × 8) - supports full 8-bit microcontroller data bus interface without address multiplexing |
| Read Access Time | 150 ns max at VCC = 4.5–5.5 V - meets timing budget for 6.67 MHz bus clock (tACC ≤ 150 ns) |
| Supply Voltage Range | 2.7–3.6 V or 4.5–5.5 V - eliminates need for voltage regulators in mixed-supply portable systems |
| Standby Current | 20 µA max at VCC = 3.6 V - extends battery life in always-on firmware storage applications |
| Programming Speed | 100 µs/byte typical - reduces production programming cycle time by >90% vs. legacy EPROMs |
| ESD Protection | 2,000 V HBM - ensures robust handling during board assembly and field replacement |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded control and automotive body electronics |
Pinout & Package
AT27BV256-15RI is packaged in a 28-lead 330-mil SOIC (package code 28R), with 0.050" lead pitch and JEDEC MS-012 compliant footprint. Pin 1 is marked by notch or dot; leads are gull-wing formed for surface-mount reflow compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus accepting full 32K-word space; TTL/LVCMOS compatible thresholds |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus; outputs drive 2.0 mA low / −400 µA high at 5 V |
| CE | Chip Enable | Active-low chip select; controls power state transition between active and standby modes |
| OE | Output Enable | Active-low output gate; enables tristate control independent of CE for 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 |
| VPP | Programming Voltage | 13.0 V programming supply; must be applied after and removed before VCC per sequencing rules |
| GND | Ground Reference | Signal and power return path; connects to PCB ground plane for noise immunity |
| NC | No Connect | Pins 12 and 26 are unconnected; must remain floating per datasheet (not tied to GND/VCC) |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time with auto-verify loop - cuts production burn-in time vs. conventional EPROMs |
| Dual-Voltage Read Operation | Operates natively at 2.7–3.6 V or 4.5–5.5 V - supports hot-plug compatibility across 3.3 V and 5 V host systems |
| Integrated Product ID Code | Manufacturer ID 0x1E and Device ID 0x8C readable via A9/A0 sequence - enables automatic programmer setup without manual part selection |
| JEDEC Pin Compatibility | Pin-for-pin identical to AT27C256R - allows drop-in replacement in existing 28-pin SOIC/PLCC/TSOP layouts |
| Low-Power Standby Mode | <20 µA ICC at 3.6 V - enables firmware retention in battery-backed systems for >10 years on coin-cell power |
Applications
| Industrial Control Firmware Storage | Portable Medical Device Boot Memory |
|---|---|
Use Scenario: Storing immutable boot code and calibration tables in PLC I/O modules operating in harsh factory environments. IC Role / Device Role / Timing Role: Nonvolatile firmware storage with guaranteed read reliability over −40°C to +85°C and immunity to brown-out events. Use Value: Eliminates external voltage regulation and enables direct connection to 3.3 V system rails, reducing BOM count and power loss. |
Use Scenario: Holding certified bootloader and safety-critical configuration data in handheld diagnostic instruments powered by single Li-ion cells. IC Role / Device Role / Timing Role: OTP memory providing tamper-resistant firmware image with sub-150 ns access for deterministic boot timing. Use Value: 20 µA standby current extends single-charge runtime beyond 6 months in sleep mode, meeting IEC 62304 power requirements. |
| Automotive Body Controller ROM | Legacy System Field Upgrade Module |
Use Scenario: Storing vehicle-specific configuration maps and CAN protocol stacks in door module ECUs requiring AEC-Q100 alignment. IC Role / Device Role / Timing Role: Industrial-temp OTP EPROM interfacing directly with 8-bit microcontrollers via parallel bus. Use Value: 2,000 V ESD rating and 200 mA latchup immunity ensure robustness against automotive EMI and load-dump transients. |
Use Scenario: Replacing obsolete AT27C256R in field-serviceable telecom line cards where board redesign is prohibited. IC Role / Device Role / Timing Role: Pin-compatible OTP memory enabling firmware updates without PCB modification or layout change. Use Value: Identical pinout and timing (tACC = 150 ns) allows immediate drop-in replacement while adding low-voltage operation capability. |
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 | 5 V only (4.5–5.5 V), no low-voltage operation; 70 ns tACC; PLCC/SOIC/TSOP packages | Requires regulated 5 V supply; unsuitable for battery-powered systems with unregulated rails | Select when legacy 5 V-only design mandates exact timing and no voltage flexibility needed |
| AT27LV256A-15JC | 3 V only (2.7–3.6 V), same 150 ns tACC; PLCC package; lacks VPP pin (internal charge pump) | No external 13 V programming supply required; incompatible with standard EPROM programmers | Select when board space prohibits VPP routing and programming occurs in-system with dedicated controller |
Compared with AT27C256R-70PC, AT27BV256-15RI adds dual-voltage support and lower standby current but retains identical pinout and programming interface; compared with AT27LV256A-15JC, it preserves external VPP control for universal programmer compatibility at the cost of one extra supply rail.
Availability
AT27BV256-15RI is available at Aetrix Electronics and suitable for industrial control firmware storage, portable medical device boot memory, and automotive body controller ROM requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AT27BV256-15RI 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 embedded systems.
The AT27BV256 product line was designed to deliver low-power, battery-voltage OTP EPROM functionality for portable and mixed-supply embedded applications-bridging legacy 5 V systems and emerging 3.3 V architectures without sacrificing speed or reliability.
FAQ
What voltage levels does the AT27BV256-15RI support during normal read operation?
The AT27BV256-15RI supports two distinct read supply ranges: 2.7 V to 3.6 V for low-voltage battery operation and 4.5 V to 5.5 V for standard 5 V systems. Both ranges are fully specified for all AC/DC parameters including tACC = 150 ns max, and the device maintains TTL-compatible outputs across both. This dual-range capability is intrinsic to the AT27BV256-15RI silicon design and requires no external configuration.
Is the AT27BV256-15RI pin-compatible with the AT27C256R series?
Yes, the AT27BV256-15RI is explicitly pin-compatible with JEDEC-standard AT27C256R devices in all supported packages (SOIC, PLCC, TSOP). Pin functions-including A0–A14, O0–O7, CE, OE, VCC, GND, and VPP-are identically mapped, and the AT27BV256-15RI datasheet confirms functional equivalence in read mode and identical programming methodology. This enables direct replacement in existing AT27C256R layouts without PCB revision.
What programming voltage and sequence are required for the AT27BV256-15RI?
The AT27BV256-15RI requires VPP = 13.0 V ± 0.25 V and VCC = 6.5 V ± 0.25 V during programming, with strict sequencing: VCC must be applied simultaneously with or before VPP, and removed simultaneously with or after VPP. Programming uses a 100 µs CE pulse per byte with built-in verify-reprogram loops. This exact sequence and voltage set is mandatory for reliable programming of the AT27BV256-15RI and differs from 3 V-only variants like AT27LV256A.
Does the AT27BV256-15RI include any built-in identification features for automated programming equipment?
Yes, the AT27BV256-15RI incorporates an Integrated Product Identification Code with Manufacturer ID = 0x1E and Device ID = 0x8C, accessible by setting A9 = 12.0 V and toggling A0 while holding all other address lines low. This feature is electrically identical to the AT27C256R and AT27LV256A, allowing standard EPROM programmers to auto-detect and select correct algorithms-ensuring consistent, error-free programming of the AT27BV256-15RI across production lines.
What decoupling capacitance is required for stable operation of the AT27BV256-15RI?
The AT27BV256-15RI requires a minimum 0.1 µF high-frequency ceramic capacitor placed between VCC and GND, mounted as close as possible to the device pins. For arrays or noisy environments, a 4.7 µF bulk electrolytic capacitor should also be added near the power entry point. These values are specified in the AT27BV256-15RI datasheet to suppress transient excursions during CE transitions that could otherwise violate absolute maximum ratings.
AT27BV256-15RI 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:
- 150 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
AT27BV256-15RI FAQ
1.How can I place an order for AT27BV256-15RI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27BV256-15RI 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 AT27BV256-15RI reliable?
The price and inventory of AT27BV256-15RI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27BV256-15RI is usually 5 days.
3.What payment methods are accepted for AT27BV256-15RI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27BV256-15RI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27BV256-15RI?
AT27BV256-15RI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27BV256-15RI 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 AT27BV256-15RI?
For technical support, including AT27BV256-15RI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27BV256-15RI requirements.
6.How does Aetrix verify that AT27BV256-15RI is sourced from the original manufacturer or authorized distributors?
All AT27BV256-15RI 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 AT27BV256-15RI meets industry standards.
7.What is the process for return or replacement of AT27BV256-15RI?
All AT27BV256-15RI units undergo pre-shipment inspection (PSI). If there is an issue with AT27BV256-15RI, 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 AT27BV256-15RI part is unused and in its original packaging.
Return procedure for AT27BV256-15RI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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