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Microchip Technology AT27BV256-15JC
- Part No.:
- AT27BV256-15JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT27BV256-15JC.pdf
- Description:
- IC EPROM 256KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,918
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Product details
Overview
AT27BV256-15JC 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 32-lead PLCC 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 legacy 5V host systems.
For engineers reviewing the AT27BV256-15JC datasheet, AT27BV256-15JC pinout, AT27BV256-15JC application, or AT27BV256-15JC 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) availability.
Technical Context
The AT27BV256-15JC 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 2.7–3.6V battery input while maintaining TTL-level output drive capability 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/VCC logic states and timing constraints.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 262,144 bits (32K × 8), fixed OTP configuration requiring no refresh or write-cycle management |
| Read Access Time | 150 ns max at VCC = 2.7–3.6V or 4.5–5.5V - defines minimum clock period for synchronous bus interfacing |
| Supply Voltage Range | 2.7V–3.6V (unregulated battery) or 4.5V–5.5V (standard 5V) - enables single-part deployment across mixed-voltage platforms |
| Standby Current | 20 µA max at VCC = 3.6V - enables multi-year battery life in always-on portable instrumentation |
| Programming Voltage | VPP = 13.0 ± 0.25V required during programming - mandates dedicated high-voltage supply or programmer support |
| Operating Temperature | -40°C to +85°C (industrial grade) - validated for automotive body control modules and industrial PLC firmware storage |
| Input/Output Compatibility | CMOS and TTL compatible I/O - allows direct connection to 5V microcontrollers without level-shifting circuitry |
Pinout & Package
AT27BV256-15JC is supplied in a 32-lead Plastic J-Leaded Chip Carrier (PLCC) package per JEDEC MS-016 AE standard. Pin 1 and Pin 17 are designated "DON'T CONNECT" and must remain unconnected in PCB layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus supporting full 32K-word addressing; driven by microcontroller or FPGA address lines |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus (output-only in read mode); drives standard TTL/CMOS loads up to 2.1 mA sink |
| CE | Chip Enable | Active-low chip select; controls device activation and power state transitions between active/standby modes |
| OE | Output Enable | Active-low output gate; used to prevent bus contention when multiple devices share data lines |
| VCC | Power Supply | Main supply input (2.7–3.6V or 4.5–5.5V); requires 0.1 µF ceramic decoupling capacitor placed adjacent to pin |
| VPP | Programming Voltage | 13.0V programming supply input; must be applied simultaneously with or after VCC and removed before or with VCC |
| GND | Ground Reference | Signal and power return path; requires low-inductance connection to system ground plane |
| NC | No Connect | Pins 1 and 17 are internally unused and must be left floating - no trace routing or soldering allowed |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time - reduces firmware update cycle time by >90% versus conventional EPROMs |
| Integrated Product ID Code | Manufacturer ID 0x1E and Device ID 0x8C - enables automatic algorithm selection in industry-standard programmers |
| Dual-Voltage Read Operation | Valid operation at 2.7–3.6V or 4.5–5.5V - eliminates need for separate 3.3V/5V regulators in mixed-supply systems |
| Low-Power Standby Mode | <1 µA typical ICC at 3V - extends battery life in handheld test equipment and remote sensor nodes |
| JEDEC Pin Compatibility | Pin-for-pin match with AT27C256R - allows drop-in replacement in existing 5V designs without PCB revision |
Applications
| Portable Medical Instrumentation | Industrial PLC Firmware Storage |
|---|---|
|
Use Scenario: Battery-powered handheld blood glucose meters and ECG monitors requiring nonvolatile program storage with ultra-low standby current. IC Role / Device Role / Timing Role: OTP EPROM storing calibrated measurement algorithms and boot firmware; accessed only during power-up or firmware update. Use Value: 20 µA max standby current at 3.6V enables multi-year operation on coin-cell batteries without regulation circuitry. |
Use Scenario: Fixed-function logic controllers in factory automation systems where firmware must survive power loss and environmental stress. IC Role / Device Role / Timing Role: Nonvolatile program memory holding ladder logic execution engine and I/O mapping tables; read-only during runtime. Use Value: -40°C to +85°C industrial temperature rating and 200 mA latchup immunity ensure reliable operation in electrically noisy plant-floor environments. |
| Legacy Embedded System Upgrades | Modular Test Equipment Cartridges |
|
Use Scenario: Retrofitting aging 5V industrial controllers with low-power capability while retaining existing PCB layout and firmware binaries. IC Role / Device Role / Timing Role: Direct replacement for AT27C256R in socketed EPROM slots; identical pinout and read timing at 5V. Use Value: JEDEC-compliant 32-lead PLCC package and TTL-compatible outputs allow zero-layout-change migration from 5V to battery-ready operation. |
Use Scenario: Field-replaceable calibration and feature-enable modules in automated test systems requiring secure, tamper-resistant firmware storage. IC Role / Device Role / Timing Role: One-time programmable memory holding calibration coefficients and feature unlock keys; programmed once at factory. Use Value: Integrated product ID code (0x1E/0x8C) ensures correct algorithm selection during module programming, preventing mismatched firmware loads. |
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 | Requires 5V ±10% supply only; no 2.7–3.6V operation; 70 ns access time; same PLCC-32 package | Restricted to regulated 5V systems; lacks battery-voltage support and LVBO compatibility | Select when legacy 5V-only design prohibits voltage range changes and faster access time is critical |
| AT27LV256A-15JC | 3.3V-only operation (3.0–3.6V); 150 ns access time; identical PLCC-32 pinout and Rapid™ programming | Not compatible with 5V hosts; requires level shifters for interfacing with 5V microcontrollers | Select when system uses only 3.3V logic and maximum power reduction is prioritized over 5V interoperability |
Compared with AT27C256R-70PC, the AT27BV256-15JC adds unregulated battery support and LVBO compliance but trades 20 ns of speed; compared with AT27LV256A-15JC, it retains 5V host compatibility at the cost of slightly higher standby current, making it the only option for dual-voltage field-upgradeable systems.
Availability
AT27BV256-15JC is available at Aetrix Electronics and suitable for portable medical instrumentation, industrial PLC firmware storage, and legacy embedded system upgrades requiring stable component supply across extended production lifecycles.
Supply support for AT27BV256-15JC 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 applications.
The AT27BV256 product line was designed to bridge legacy 5V EPROM systems with emerging low-power portable electronics, delivering pin-compatible OTP memory with battery-voltage operation and rapid programming.
FAQ
What voltage ranges does the AT27BV256-15JC support during normal read operation?
The AT27BV256-15JC supports two independent 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 between 3.6V and 4.5V. Both ranges deliver full functionality including TTL-compatible outputs at 3.0V and LVBO compliance at 2.7V. The AT27BV256-15JC must not be powered outside these specified bands during read mode.
Is the AT27BV256-15JC pin-compatible with the AT27C256R series?
Yes, the AT27BV256-15JC is fully JEDEC-pin-compatible with the AT27C256R series in the 32-lead PLCC package. Pin functions, numbering, and physical dimensions match exactly, allowing direct socket replacement in existing 5V designs. However, AT27BV256-15JC requires VPP = 13.0V for programming, whereas AT27C256R uses VPP = 12.5V - verify programmer compatibility before substitution.
What is the programming voltage requirement for the AT27BV256-15JC?
The AT27BV256-15JC requires VPP = 13.0 ± 0.25V during programming, with strict sequencing: VCC must be applied simultaneously with or before VPP, and removed simultaneously with or after VPP. A 0.1 µF capacitor is mandatory between VPP and GND to suppress transients. This differs from AT27C256R (12.5V) and AT27LV256A (12.0V), so confirm programmer voltage accuracy before use.
Does the AT27BV256-15JC support industrial temperature operation?
Yes, the AT27BV256-15JC is qualified for industrial temperature range operation from -40°C to +85°C, as confirmed by the "I" suffix in ordering codes like AT27BV256-15JI. This rating applies to both read and standby modes under specified voltage conditions. The device maintains full AC/DC parameter compliance across this range, including 150 ns max access time and 20 µA max standby current at 3.6V.
How does the Rapid™ Programming Algorithm improve efficiency for the AT27BV256-15JC?
The Rapid™ Programming Algorithm reduces AT27BV256-15JC programming time to 100 µs per byte (typical), accelerating full 32K-byte firmware writes to under 3.2 seconds. It employs a verification/reprogramming loop per byte, applying up to 10 pulses if verification fails. This eliminates batch-programming delays and improves yield in high-volume manufacturing. The AT27BV256-15JC uses the same algorithm as AT27C256R, ensuring tooling compatibility.
AT27BV256-15JC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- 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:
- 32-PLCC (13.97x11.43)
AT27BV256-15JC FAQ
1.How can I place an order for AT27BV256-15JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27BV256-15JC 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 AT27BV256-15JC reliable?
The price and inventory of AT27BV256-15JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27BV256-15JC is usually 5 days.
3.What payment methods are accepted for AT27BV256-15JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27BV256-15JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27BV256-15JC?
AT27BV256-15JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27BV256-15JC 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 AT27BV256-15JC?
For technical support, including AT27BV256-15JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27BV256-15JC requirements.
6.How does Aetrix verify that AT27BV256-15JC is sourced from the original manufacturer or authorized distributors?
All AT27BV256-15JC 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 AT27BV256-15JC meets industry standards.
7.What is the process for return or replacement of AT27BV256-15JC?
All AT27BV256-15JC units undergo pre-shipment inspection (PSI). If there is an issue with AT27BV256-15JC, 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 AT27BV256-15JC part is unused and in its original packaging.
Return procedure for AT27BV256-15JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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