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Microchip Technology AT27BV256-12JI
- Part No.:
- AT27BV256-12JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT27BV256-12JI.pdf
- Description:
- IC EPROM 256KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT27BV256-12JI 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 industrial temperature range (–40°C to +85°C). It serves as nonvolatile program storage in embedded controllers, portable instrumentation, and legacy system upgrades where pin compatibility with AT27C256R is required.
For engineers reviewing the AT27BV256-12JI datasheet, AT27BV256-12JI pinout, AT27BV256-12JI application, or AT27BV256-12JI equivalent, key selection criteria include its unregulated battery-voltage operation, Rapid™ programming algorithm (100 µs/byte), JEDEC-standard PLCC-32 package, and CMOS/TTL I/O compatibility across both voltage ranges.
Technical Context
The AT27BV256-12JI implements a standard 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-voltage design enables direct interface with 3.3V microcontrollers while maintaining TTL-level output drive at 2.7V–3.6V VCC.
It features integrated product identification code (Manufacturer ID: 0x1E, Device ID: 0x8C), 2,000V ESD protection, and latchup immunity of 200 mA. The device operates in Read, Output Disable, Standby, Rapid Program, PGM Verify, and Product Identification modes - all controlled via CE, OE, A9, and A0 pins per JEDEC-compliant timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32K × 8) - provides sufficient boot code or firmware storage for 8-bit microcontroller systems without external memory expansion. |
| Read Access Time | 70 ns max at VCC = 2.7–3.6V - enables real-time execution from ROM in high-speed 8-bit MCUs running up to ~10 MHz. |
| Supply Voltage Range | 2.7V–3.6V (unregulated battery) or 4.5V–5.5V - eliminates need for LDO regulation in portable designs powered by single Li-ion or 3×AA cells. |
| Standby Current | 20 µA max at VCC = 3.6V - extends battery life in always-on or infrequently accessed firmware storage applications. |
| Programming Speed | 100 µs/byte typical (Rapid™ Algorithm) - reduces production programming time versus legacy EPROMs requiring 10+ ms/byte. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded control, automotive body electronics, and outdoor instrumentation. |
| I/O Compatibility | CMOS and TTL inputs/outputs - interoperates directly with both 3.3V logic families and legacy 5V microcontrollers without level shifters. |
Pinout & Package
AT27BV256-12JI is supplied in a 32-lead Plastic Leaded Chip Carrier (PLCC) package per JEDEC MS-016AE. Pins 1 and 17 are designated "DON'T CONNECT" and must remain unconnected on PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus accepting full 32K-word range; compatible with 8051, Z80, and 68K family address buses. |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus (output-only during read); drives TTL loads directly at VCC ≥ 2.7V. |
| CE | Chip Enable | Active-low chip select enabling memory access only when asserted; controls power state transition between active and standby. |
| OE | Output Enable | Active-low output gate; allows multiple devices on same data bus without contention when deasserted. |
| VCC | Power Supply | Primary 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 | 13.0 V ± 0.25 V input during programming; must be applied simultaneously with or after VCC and removed simultaneously or before VCC. |
| GND | Ground Reference | Signal and power ground reference; requires low-inductance connection to system ground plane. |
| NC | No Connect | Pins 1 and 17 are internally unused and must not be soldered or routed on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Unregulated Battery-Voltage™ Operation | Supports direct connection to 2.7–3.6V battery sources (e.g., 3×AA, LiFePO₄) without regulation - reduces BOM count and power loss. |
| Rapid™ Programming Algorithm | Guarantees reliable programming in ≤100 µs/byte with built-in verify-reprogram loop - improves manufacturing throughput and yield. |
| Integrated Product Identification Code | Electronically readable Manufacturer ID (0x1E) and Device ID (0x8C) - enables automatic algorithm selection in universal programmers. |
| Dual-Voltage I/O Compatibility | Outputs meet TTL VOH/VOL specs at VCC = 2.7V–3.6V and LVBO specs at VCC = 2.7V - ensures interoperability across mixed-voltage systems. |
| JEDEC Pin Compatibility | Pinout matches AT27C256R exactly - allows drop-in replacement in existing 28-pin SOIC/TSOP or 32-pin PLCC footprints without layout change. |
Applications
| Industrial Control Firmware Storage | Portable Medical Instrument Boot ROM |
|---|---|
Use Scenario: Storing fixed calibration tables and safety-critical boot code in PLC I/O modules operating in harsh factory environments. IC Role / Device Role / Timing Role: Nonvolatile program memory providing deterministic startup sequence and runtime lookup tables. Use Value: Industrial temperature rating (–40°C to +85°C) and 200 mA latchup immunity ensure reliability under EMI-rich plant-floor conditions. |
Use Scenario: Holding firmware for handheld glucose meters and pulse oximeters powered by coin-cell or AAA batteries. IC Role / Device Role / Timing Role: Low-power OTP storage for application code and device configuration data accessed during cold start. Use Value: 20 µA max standby current and unregulated 2.7–3.6V operation extend battery life beyond 2 years in intermittent-use devices. |
| Legacy System Upgrade Memory | Automotive Body Control Module ROM |
Use Scenario: Replacing obsolete 5V EPROMs (e.g., AT27C256R) in aging test equipment and telecom line cards. IC Role / Device Role / Timing Role: Pin-compatible ROM upgrade enabling continued support without redesigning PCBs or firmware. Use Value: Identical PLCC-32 footprint and JEDEC timing parameters allow field retrofit with zero hardware modification. |
Use Scenario: Storing lighting control logic and CAN message routing tables in door module ECUs. IC Role / Device Role / Timing Role: Read-only firmware repository accessed during MCU initialization and periodic self-test routines. Use Value: 2,000V HBM ESD rating and robust VPP sequencing tolerance meet automotive component stress requirements (ISO 10605). |
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; identical 70 ns access and PLCC-28 package. | Requires regulated 5V supply; unsuitable for battery-powered systems with variable voltage. | Select when replacing legacy 5V-only designs and board space permits SOIC-28 instead of PLCC-32. |
| AT27LV256A-12JC | 3V-only operation (2.7–3.6V); same 70 ns speed and PLCC-32 package; lacks 5V compatibility. | Cannot operate in dual-supply host systems; no TTL-level output guarantee at 2.7V. | Choose only for new 3.3V-only designs where 5V backward compatibility is unnecessary. |
Compared with AT27C256R-70PC and AT27LV256A-12JC, the AT27BV256-12JI uniquely supports both unregulated battery and standard 5V supplies in a single device, enabling one-BOM solutions for multi-platform products and simplifying inventory management across industrial and portable variants.
Availability
AT27BV256-12JI is available at Aetrix Electronics and suitable for industrial control firmware storage, portable medical instrument boot ROM, and legacy system upgrade memory requiring stable component supply across extended lifecycle programs.
Supply support for AT27BV256-12JI 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.
The AT27BV256 product line was designed to deliver low-power, battery-voltage OTP EPROMs for portable and industrial embedded systems requiring long-term firmware retention without refresh or write endurance concerns.
FAQ
What voltage levels does the AT27BV256-12JI support during normal read operation?
The AT27BV256-12JI supports two distinct supply ranges for read operation: 2.7V to 3.6V (unregulated battery mode) and 4.5V to 5.5V (standard 5V ±10% mode). Both ranges are fully supported simultaneously in the same device, and outputs meet TTL specifications across the entire 2.7V–3.6V range. This dual-voltage capability is intrinsic to the AT27BV256-12JI silicon design and requires no external configuration.
Is the AT27BV256-12JI pin-compatible with the AT27C256R?
Yes, the AT27BV256-12JI is explicitly pin-compatible with the JEDEC-standard AT27C256R across all supported packages, including PLCC-32. Pin functions, ordering of address/data/control signals, and mechanical footprint match exactly. This allows direct substitution in existing AT27C256R-based designs without PCB revision, provided VPP and decoupling requirements are observed.
What programming voltage and timing does the AT27BV256-12JI require?
The AT27BV256-12JI requires VPP = 13.0 V ± 0.25 V and VCC = 6.5 V ± 0.25 V during programming, with VCC applied simultaneously with or before VPP. Each byte is programmed using a 100 µs CE pulse width (±5%), followed by verification. The Rapid™ algorithm guarantees successful programming within ≤10 pulses per failing byte, and the AT27BV256-12JI uses the same programming equipment as AT27C256R.
Does the AT27BV256-12JI support product identification codes?
Yes, the AT27BV256-12JI includes an integrated product identification code accessible via A9 and A0 pins. With A1–A14 held low, setting A9 = 12.0 V and toggling A0 selects either the Manufacturer ID (0x1E) or Device ID (0x8C). This feature is electrically identical to that of AT27C256R and AT27LV256A, enabling automatic recognition by industry-standard programmers.
What decoupling capacitors are required for stable operation of the AT27BV256-12JI?
The AT27BV256-12JI requires a 0.1 µF ceramic capacitor placed between VCC and GND, mounted as close as possible to the device pins. For systems with multiple AT27BV256-12JI devices or large EPROM arrays, a 4.7 µF bulk electrolytic capacitor must also be added between VCC and GND near the power entry point. These values are mandatory per Atmel's system considerations and prevent transient-induced non-conformance.
AT27BV256-12JI 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:
- 120 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)
AT27BV256-12JI FAQ
1.How can I place an order for AT27BV256-12JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27BV256-12JI 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 AT27BV256-12JI reliable?
The price and inventory of AT27BV256-12JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27BV256-12JI is usually 5 days.
3.What payment methods are accepted for AT27BV256-12JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27BV256-12JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27BV256-12JI?
AT27BV256-12JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27BV256-12JI 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 AT27BV256-12JI?
For technical support, including AT27BV256-12JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27BV256-12JI requirements.
6.How does Aetrix verify that AT27BV256-12JI is sourced from the original manufacturer or authorized distributors?
All AT27BV256-12JI 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 AT27BV256-12JI meets industry standards.
7.What is the process for return or replacement of AT27BV256-12JI?
All AT27BV256-12JI units undergo pre-shipment inspection (PSI). If there is an issue with AT27BV256-12JI, 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 AT27BV256-12JI part is unused and in its original packaging.
Return procedure for AT27BV256-12JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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