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Microchip Technology AT27BV256-15JI
- Part No.:
- AT27BV256-15JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT27BV256-15JI.pdf
- Description:
- IC EPROM 256KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,994
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Product details
Overview
AT27BV256-15JI 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-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 rapid programming at 100 µs/byte.
For engineers reviewing the AT27BV256-15JI datasheet, AT27BV256-15JI pinout, AT27BV256-15JI application, or AT27BV256-15JI equivalent, this device serves as a drop-in replacement for AT27C256R in portable instrumentation, embedded firmware storage, and legacy system upgrades requiring unregulated battery voltage tolerance and JEDEC-standard PLCC packaging.
Technical Context
The AT27BV256-15JI implements a CMOS OTP EPROM architecture with two-line control (CE/OE), enabling bus contention avoidance in shared-memory systems. Its dual-supply compatibility allows seamless integration into mixed-voltage designs without level-shifting circuitry.
It uses Atmel's Rapid™ Programming Algorithm with 100 µs/byte typical write pulse width and integrated product identification code (Manufacturer ID: 0x1E, Device ID: 0x8C) for automated programmer recognition. Programming requires VCC = 6.5V and VPP = 13.0V, while read mode operates at standard logic levels across both supply ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 262,144 bits (32K × 8), sufficient for boot code or configuration data in space-constrained embedded systems |
| Read Access Time | 150 ns max at VCC = 2.7–3.6V, meeting timing requirements for 6.7 MHz bus interfaces |
| Supply Voltage Range | 2.7V–3.6V (unregulated battery) or 4.5V–5.5V (standard 5V), eliminating need for external regulators in portable designs |
| Standby Current | 20 µA max at VCC = 3.6V, enabling multi-year battery life in always-on monitoring devices |
| Programming Speed | 100 µs/byte typical, reducing production programming cycle time versus legacy 5V EPROMs |
| Operating Temperature | −40°C to +85°C, qualified for industrial control and automotive under-hood auxiliary modules |
| ESD Protection | 2,000V HBM, supporting handling in non-ESD-controlled manufacturing environments |
Pinout & Package
AT27BV256-15JI is supplied in a 32-lead plastic J-leaded chip carrier (PLCC) package per JEDEC MS-016 AE. Pins 1 and 17 are no-connect (NC) and must remain unconnected in PCB layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus accepting 32K unique locations; CMOS/TTL compatible thresholds |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus with TTL-level VOH/VOL at 3.0V, compatible with 5V logic |
| CE | Chip Enable | Active-low enable controlling device selection; used with OE to manage bus contention |
| OE | Output Enable | Active-low output gate; allows multiple devices on same data bus without tri-state conflicts |
| VCC | Power Supply | Primary supply input supporting dual-voltage operation (2.7–3.6V or 4.5–5.5V) |
| VPP | Programming Voltage | 13.0V input required only during programming; must be applied after and removed before VCC |
| GND | Ground Reference | Common return path for all signals and supplies; requires local 0.1 µF ceramic decoupling |
| NC | No Connect | Pins 1 and 17 are internally unused; must not be soldered or routed on PCB |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time enables high-throughput factory programming without special equipment |
| Dual-Voltage Read Operation | Operates natively at 2.7–3.6V or 4.5–5.5V, removing voltage translation components in hybrid-system designs |
| Integrated Product ID Code | Manufacturer ID (0x1E) and Device ID (0x8C) allow automatic algorithm selection in industry-standard programmers |
| JEDEC Pin Compatibility | Pin-for-pin identical to AT27C256R, enabling direct replacement in existing 28-pin SOIC/TSOP and 32-pin PLCC layouts |
| Low-Power Standby Mode | 20 µA max ICC in standby ensures minimal quiescent drain in battery-backed memory retention applications |
Applications
| Portable Medical Instrumentation | Industrial PLC Firmware Storage |
|---|---|
Use Scenario: Battery-powered handheld diagnostic devices requiring nonvolatile firmware storage with long shelf life and low self-discharge. IC Role / Device Role / Timing Role: OTP EPROM storing boot loader and calibration constants; accessed during power-up initialization with <150 ns timing margin. Use Value: Unregulated 2.7–3.6V operation eliminates DC-DC converter, reducing BOM cost and board area by ~30% versus 5V-only alternatives. |
Use Scenario: Programmable logic controller modules deployed in factory automation environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Nonvolatile memory holding ladder logic firmware; read during cold start with CE/OE-controlled bus arbitration. Use Value: −40°C to +85°C qualification and 2,000V ESD rating ensure reliable operation in electrically noisy industrial settings without additional protection circuitry. |
| Legacy System Upgrade Path | Embedded Test Equipment Calibration |
Use Scenario: Retrofitting aging test instruments originally designed for AT27C256R to extend service life using modern low-power components. IC Role / Device Role / Timing Role: Direct pin-compatible replacement preserving original PCB layout and firmware binary compatibility. Use Value: Eliminates need for PCB re-spin or firmware recompilation while cutting active power consumption by >80% at 3.3V operation. |
Use Scenario: Portable calibration standards requiring traceable, tamper-proof storage of sensor compensation coefficients. IC Role / Device Role / Timing Role: One-time programmable memory written once during factory calibration; read-only during field use. Use Value: Rapid programming (100 µs/byte) reduces calibration station dwell time, increasing throughput by 3× versus conventional EPROMs. |
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 time | Requires regulated 5V supply; unsuitable for battery-powered systems | Select when legacy 5V-only design prohibits voltage scaling and PCB layout cannot accommodate PLCC-to-SOIC change |
| AT27LV256A-15JC | 3V-only operation (2.7–3.6V); same 150 ns speed grade; identical PLCC package | Lacks 5V compatibility; cannot operate in dual-supply host systems | Select when system exclusively uses 3V rails and requires lowest possible active current (18 mW vs. 29 mW at 5 MHz) |
Compared with AT27C256R-70PC and AT27LV256A-15JC, the AT27BV256-15JI uniquely bridges both voltage domains-enabling reuse in mixed-voltage platforms-while retaining JEDEC pinout and programming compatibility, making it the only option for upgrading legacy 5V systems to battery-ready operation without hardware redesign.
Availability
AT27BV256-15JI is available at Aetrix Electronics and suitable for portable medical instrumentation, industrial PLC firmware storage, and legacy system upgrade paths requiring stable component supply, long-term obsolescence management, and industrial temperature qualification.
Supply support for AT27BV256-15JI 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 secure authentication ICs for industrial, automotive, and consumer applications.
The AT27BV256 product line was engineered to replace aging 5V EPROMs in battery-operated and mixed-voltage embedded systems, delivering pin-compatible low-power OTP memory with rapid programming and robust industrial reliability.
FAQ
What voltage ranges does the AT27BV256-15JI support during normal read operation?
The AT27BV256-15JI supports two distinct read voltage ranges: 2.7V to 3.6V for unregulated battery applications and 4.5V to 5.5V for standard 5V systems. It does not operate reliably outside these ranges during read mode. Programming requires separate VCC = 6.5V and VPP = 13.0V supplies, which are not used during normal read operation. This dual-range capability makes the AT27BV256-15JI suitable for portable and hybrid-voltage designs without external regulation.
Is the AT27BV256-15JI pin-compatible with the AT27C256R, and what does that mean for PCB layout?
Yes, the AT27BV256-15JI is JEDEC-standard pin-compatible with the AT27C256R in its 32-lead PLCC package. Pins 1 and 17 are NC on both devices, and all address, data, control, and power terminals map identically. This means existing PCBs designed for AT27C256R can accept AT27BV256-15JI without layout changes-enabling direct replacement in legacy systems. The AT27BV256-15JI retains identical footprint, solder mask, and thermal pad requirements as the AT27C256R.
What is the programming methodology for the AT27BV256-15JI, and how does it differ from standard EPROMs?
The AT27BV256-15JI uses Atmel's Rapid™ Programming Algorithm, applying 100 µs CE pulses per byte with automatic verification and up to 10 retries per failed location. Unlike UV-erasable EPROMs, it is one-time programmable and requires VCC = 6.5V and VPP = 13.0V during programming-supplies not needed for read operation. It shares the same programming sequence and equipment compatibility as AT27C256R, allowing reuse of existing programmers without firmware updates. The AT27BV256-15JI also features an integrated product ID code (0x1E/0x8C) for automatic algorithm selection.
Does the AT27BV256-15JI require external decoupling capacitors, and if so, what values are specified?
Yes, the AT27BV256-15JI requires two decoupling capacitors per device: a 0.1 µF high-frequency ceramic capacitor placed between VCC and GND as close to the pins as possible to suppress switching transients, and a 4.7 µF bulk electrolytic capacitor near the power entry point for arrays of multiple devices. These values are mandated in the datasheet to prevent non-conformance due to voltage excursions during CE transitions. Omitting either capacitor risks data corruption or premature device failure, especially in battery-powered systems where supply impedance is higher.
What temperature range is guaranteed for the AT27BV256-15JI, and how is it validated?
The AT27BV256-15JI is rated for industrial temperature operation from −40°C to +85°C, verified per JEDEC JESD22-A108 stress testing protocols. All AC and DC parameters-including tACC = 150 ns, ISB = 20 µA max, and ICC = 8 mA-are guaranteed across this full range. The "I" suffix in AT27BV256-15JI explicitly denotes industrial qualification, distinguishing it from commercial-grade variants (e.g., "C" suffix) rated only from 0°C to +70°C. This validation ensures reliable boot-code execution in harsh environments like factory floors or outdoor telemetry units.
AT27BV256-15JI 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:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT27BV256-15JI FAQ
1.How can I place an order for AT27BV256-15JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27BV256-15JI 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 AT27BV256-15JI reliable?
The price and inventory of AT27BV256-15JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27BV256-15JI is usually 5 days.
3.What payment methods are accepted for AT27BV256-15JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27BV256-15JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27BV256-15JI?
AT27BV256-15JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27BV256-15JI 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 AT27BV256-15JI?
For technical support, including AT27BV256-15JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27BV256-15JI requirements.
6.How does Aetrix verify that AT27BV256-15JI is sourced from the original manufacturer or authorized distributors?
All AT27BV256-15JI 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 AT27BV256-15JI meets industry standards.
7.What is the process for return or replacement of AT27BV256-15JI?
All AT27BV256-15JI units undergo pre-shipment inspection (PSI). If there is an issue with AT27BV256-15JI, 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 AT27BV256-15JI part is unused and in its original packaging.
Return procedure for AT27BV256-15JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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