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Microchip Technology AT27BV256-15RC
- Part No.:
- AT27BV256-15RC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-SOIC (0.342", 8.69mm Width)
- Datasheet:
-
AT27BV256-15RC.pdf
- Description:
- IC EPROM 256KBIT PARALLEL 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,917
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Product details
Overview
AT27BV256-15RC 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, dual supply operation (2.7–3.6V or 4.5–5.5V), and JEDEC-standard 28-pin SOIC packaging. It delivers TTL-compatible outputs at 3.0V and supports LVBO interface compliance at 2.7V, enabling direct integration into portable embedded controllers and memory-mapped peripherals.
For engineers reviewing the AT27BV256-15RC datasheet, AT27BV256-15RC pinout, AT27BV256-15RC application, or AT27BV256-15RC equivalent, key selection criteria include unregulated battery voltage support, rapid 100 µs/byte programming, <1 µA typical standby current at 3V, JEDEC pin compatibility with AT27C256R, and industrial temperature range (-40°C to +85°C) operation.
Technical Context
The AT27BV256-15RC implements a CMOS OTP EPROM architecture with two-line control (CE/OE), supporting fast random-access reads and Rapid™ programming via VPP = 13.0V. Its dual-voltage design eliminates external regulation by accepting unregulated battery inputs from 2.7V to 3.6V while maintaining TTL-level output drive at 3.0V.
It features integrated product identification code (Manufacturer ID: 0x1E, Device ID: 0x8C), 2,000V ESD protection, and 200 mA latchup immunity. The device operates in five distinct modes-Read, Output Disable, Standby, Rapid Program, and Product Identification-each defined by specific CE/OE/VPP logic states and timing constraints.
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 | 150 ns max - defines maximum delay from address/CE/OE assertion to valid output data |
| Supply Voltage Range | 2.7V–3.6V or 4.5V–5.5V - enables direct connection to unregulated Li-ion or alkaline batteries without LDO |
| Standby Current | 20 µA max at VCC = 3.6V - ensures ultra-low power retention during system sleep |
| Programming Speed | 100 µs/byte typical - reduces production programming time versus standard EPROMs |
| Operating Temperature | -40°C to +85°C - qualified for industrial-grade embedded applications |
| Output Compatibility | TTL- and LVBO-compliant - interoperable with both 5V logic and 2.7V–3.6V low-voltage systems |
Pinout & Package
AT27BV256-15RC is supplied in a 28-lead, 0.330-inch wide plastic SOIC (package code 28R), JEDEC MS-012 compliant. Pin 1 is index-marked; no internal connections exist to pins labeled NC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus selecting one of 32K bytes; CMOS/TTL compatible thresholds |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus in read mode; high-impedance when OE or CE inactive |
| CE | Chip Enable | Active-low global enable; controls entry to Read, Standby, or Programming modes |
| OE | Output Enable | Active-low output gate; allows bus sharing without contention when disabled |
| VCC | Power Supply | Primary supply input (2.7–3.6V or 4.5–5.5V); requires local 0.1 µF ceramic decoupling |
| GND | Ground Reference | Signal and power return path; must be low-inductance connection per layout guidelines |
| VPP | Programming Voltage | 13.0V ±0.25V input during programming; requires dedicated 0.1 µF capacitor to ground |
| NC | No Connect | Pins 12 and 25 are unconnected internally; must remain floating or grounded per PCB design |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time with automatic verify/reprogram loop up to 10 pulses per byte |
| Dual-Voltage Read Operation | Operates across 2.7–3.6V (battery) or 4.5–5.5V (legacy 5V) without hardware change |
| Integrated Product ID Code | Electronically readable Manufacturer ID (0x1E) and Device ID (0x8C) for automated programmer recognition |
| JEDEC Pin Compatibility | Pin-for-pin identical to AT27C256R - enables drop-in replacement in existing 5V designs |
| Low-Power CMOS Design | 20 µA max standby current at 3.6V and 8 mA active current at 5 MHz - extends battery life in portable systems |
Applications
| Portable Data Logger | Industrial PLC Firmware Storage |
|---|---|
Use Scenario: Battery-powered environmental sensor node logging temperature/humidity at 10-second intervals over 6 months. IC Role / Device Role / Timing Role: Nonvolatile firmware and calibration table storage; accessed only on boot and parameter update. Use Value: Unregulated 3.0V battery operation eliminates DC-DC converter, reducing BOM cost and board area while sustaining <1 µA standby draw. |
Use Scenario: Field-upgradable ladder logic program storage in DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Static program memory mapped to CPU address space; read-only during runtime execution. Use Value: 150 ns access time meets real-time scan cycle timing; industrial temp rating ensures reliability in cabinet environments up to 85°C. |
| Medical Diagnostic Handheld | Legacy System Retrofit Module |
Use Scenario: Portable ultrasound probe with embedded FPGA configuration and diagnostic algorithm storage. IC Role / Device Role / Timing Role: Boot ROM for FPGA bitstream and firmware initialization sequence. Use Value: TTL-compatible 3.0V outputs interface directly to FPGA I/O banks without level shifters, simplifying signal integrity design. |
Use Scenario: Replacement EPROM in aging test equipment originally designed for AT27C256R. IC Role / Device Role / Timing Role: Pin-compatible memory upgrade enabling lower power and battery operation without PCB redesign. Use Value: Identical pinout and timing parameters allow direct substitution; VPP programming compatibility preserves existing programming infrastructure. |
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; PLCC/SOIC/CDIP packages | Requires regulated 5V supply; incompatible with battery-powered systems below 4.5V | Select when legacy 5V system compatibility and fastest access are primary; not suitable for unregulated battery use. |
| AT27LV256A-15JC | 3V-only operation (2.7–3.6V); same 150 ns speed; PLCC package; lacks VPP programming pin (uses internal charge pump) | No external 13V programming supply needed; limited to 3V systems only | Select when eliminating VPP circuitry is critical and 5V host compatibility is unnecessary. |
Compared with AT27C256R-70PC and AT27LV256A-15JC, the AT27BV256-15RC uniquely bridges dual-supply operation, retains VPP-based programming compatibility with legacy tools, and maintains industrial temperature qualification - making it the only option for retrofitting battery-powered or mixed-voltage systems requiring field-programmability.
Availability
AT27BV256-15RC is available at Aetrix Electronics and suitable for portable instrumentation, industrial control firmware storage, and medical handheld devices requiring stable component supply across extended lifecycle programs.
Supply support for AT27BV256-15RC 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 AT27BV256-15RC belongs to Atmel's Battery-Voltage™ OTP EPROM family, engineered specifically for portable and battery-operated applications where supply regulation is impractical and low quiescent current is essential.
FAQ
What is the maximum operating voltage for VPP on the AT27BV256-15RC during programming?
The AT27BV256-15RC requires VPP = 13.0V ± 0.25V for reliable programming, with absolute maximum rating of +14.0V on A9 and VPP pins. Exceeding this risks permanent damage. Programming must follow strict sequencing: VCC applied simultaneously with or before VPP, and removed simultaneously with or after VPP. The AT27BV256-15RC datasheet specifies that VPP must be stabilized before initiating the 100 µs CE pulse.
Does the AT27BV256-15RC support true 3.3V I/O signaling with 5V-tolerant inputs?
No - the AT27BV256-15RC does not support 5V-tolerant inputs. Its VIH minimum is 0.7 × VCC (e.g., 2.1V at VCC = 3.0V), and VOH minimum is VCC − 0.1V. At VCC = 3.0V, outputs meet TTL thresholds (VOH ≥ 2.4V, VOL ≤ 0.4V), allowing direct interfacing with 5V TTL logic, but inputs must not exceed VCC + 0.5V. The AT27BV256-15RC is not designed for mixed-voltage I/O beyond its specified dual-supply read modes.
Can the AT27BV256-15RC be reprogrammed after initial programming?
No - the AT27BV256-15RC is a one-time programmable (OTP) EPROM. Once programmed, memory cells are permanently altered using high-voltage Fowler-Nordheim tunneling; no erase mechanism exists. The AT27BV256-15RC supports only programming and verification cycles - not erasure. For field-updatable memory, a flash or EEPROM alternative would be required.
What decoupling capacitors are mandatory for stable operation of the AT27BV256-15RC?
The AT27BV256-15RC requires two mandatory capacitors: a 0.1 µF high-frequency ceramic capacitor placed between VCC and GND as close as possible to the device pins, and a 4.7 µF bulk electrolytic capacitor near the power entry point for arrays. These suppress transient voltage excursions during CE transitions. Failure to implement both violates the AT27BV256-15RC's system considerations and may cause non-conformance or data corruption.
Is the AT27BV256-15RC pinout identical to the AT27C256R across all package types?
Yes - the AT27BV256-15RC maintains identical pin assignments and functions for all three JEDEC-standard packages (PLCC, SOIC, TSOP) relative to the AT27C256R. Pin numbering, signal names (A0–A14, O0–O7, CE, OE, VCC, GND, VPP), and NC locations match exactly. This enables direct PCB-level substitution in existing AT27C256R designs, provided VPP routing and decoupling comply with AT27BV256-15RC requirements.
AT27BV256-15RC 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:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOIC
AT27BV256-15RC FAQ
1.How can I place an order for AT27BV256-15RC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27BV256-15RC 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 AT27BV256-15RC reliable?
The price and inventory of AT27BV256-15RC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27BV256-15RC is usually 5 days.
3.What payment methods are accepted for AT27BV256-15RC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27BV256-15RC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27BV256-15RC?
AT27BV256-15RC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27BV256-15RC 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 AT27BV256-15RC?
For technical support, including AT27BV256-15RC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27BV256-15RC requirements.
6.How does Aetrix verify that AT27BV256-15RC is sourced from the original manufacturer or authorized distributors?
All AT27BV256-15RC 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 AT27BV256-15RC meets industry standards.
7.What is the process for return or replacement of AT27BV256-15RC?
All AT27BV256-15RC units undergo pre-shipment inspection (PSI). If there is an issue with AT27BV256-15RC, 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 AT27BV256-15RC part is unused and in its original packaging.
Return procedure for AT27BV256-15RC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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