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Microchip Technology AT27LV256A-15JI
- Part No.:
- AT27LV256A-15JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT27LV256A-15JI.pdf
- Description:
- IC EPROM 256KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,181
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Product details
Overview
AT27LV256A-15JI from Atmel is a 256K-bit (32K × 8) one-time programmable EPROM optimized for low-voltage battery-powered systems, featuring 55 ns read access time at 3.0–3.6 V, dual 3.3 V / 5 V supply compatibility, and industrial temperature range (−40°C to +85°C). It delivers 8 mA active current at 5 MHz and <20 µA max standby current, with JEDEC-standard PLCC-32 packaging.
For engineers reviewing the AT27LV256A-15JI datasheet, AT27LV256A-15JI pinout, AT27LV256A-15JI application, or AT27LV256A-15JI equivalent, key selection criteria include OTP reliability in legacy embedded boot memory, voltage-flexible interface with TTL/CMOS logic, rapid 100 µs/byte programming, and industrial-grade ESD (2,000 V) and latchup (200 mA) immunity.
Technical Context
The AT27LV256A-15JI implements a standard OTP EPROM architecture with two-line control (CE/OE), supporting fast random-access reads and rapid byte-wise programming using VPP = 13.0 V and VCC = 6.5 V. Its address space spans A0–A14 (15 bits), enabling full 32K-byte decoding without external logic.
It operates in three distinct voltage modes: low-voltage read (3.0–3.6 V), standard 5 V read (4.5–5.5 V), and programming (VCC = 6.5 V, VPP = 13.0 V). Output levels are TTL-compatible at 3.0 V, allowing direct interfacing with 5 V systems without level shifters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32K × 8) - supports full 32 KB firmware or boot code storage |
| Read Access Time | 150 ns max - guaranteed timing for 6.67 MHz bus operation in industrial environments |
| Supply Voltage Range | 3.0–3.6 V or 4.5–5.5 V - enables drop-in replacement in mixed-voltage legacy systems |
| Standby Current | 20 µA max at VCC = 3.6 V - enables ultra-low-power retention in portable or battery-backed applications |
| Programming Speed | 100 µs/byte typical - reduces production programming cycle time vs. older EPROMs |
| Operating Temperature | −40°C to +85°C - qualified for industrial control, automotive body electronics, and telecom infrastructure |
| ESD Protection | 2,000 V HBM - ensures robustness during handling and board assembly |
Pinout & Package
AT27LV256A-15JI is supplied in a 32-lead Plastic Leaded Chip Carrier (PLCC) package per JEDEC MS-016 AE. Pins 1 and 17 are no-connect (NC) and must remain unconnected on PCB layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus for full 32K-byte addressing; CMOS/TTL compatible thresholds |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus; TTL-level outputs functional at VCC = 3.0 V |
| CE | Chip Enable | Active-low chip select; controls device activation and power state transitions |
| OE | Output Enable | Active-low output gate; enables high-impedance tri-state when deasserted |
| VCC | Power Supply | Primary supply for read/standby; accepts 3.0–3.6 V or 4.5–5.5 V |
| VPP | Programming Voltage | 13.0 V input required only during programming; must be sequenced with VCC |
| GND | Ground Reference | Signal and power return; requires local 0.1 µF ceramic decoupling |
| NC | No Connect | Pins 1 and 17 - physically present but electrically unused; must float |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time with auto-verify loop - reduces production test time and improves yield |
| Dual-Voltage Read Operation | Single device supports both 3.3 V and 5 V host systems - eliminates BOM splits for field-upgradable hardware |
| Integrated Product ID Code | Manufacturer ID (0x1E) and Device Code (0x8C) readable via A9/VH and A0 toggle - enables automated programmer validation |
| JEDEC Pin Compatibility | Pinout matches AT27C256R - allows reuse of existing socket layouts and PCB footprints |
| Low-Power Standby Mode | <1 µA typical ICC at 3.3 V - extends battery life in always-on embedded controllers |
Applications
| Industrial PLC Firmware Storage | Legacy Telecom Line Card Boot ROM |
|---|---|
Use Scenario: Storing immutable boot firmware and configuration tables in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile boot memory providing deterministic startup sequence and fail-safe recovery. Use Value: Industrial temperature rating and 2,000 V ESD protection ensure reliable operation in electrically noisy plant-floor settings. |
Use Scenario: Holding initialization code and protocol stacks on line interface cards used in central office switching equipment. IC Role / Device Role / Timing Role: OTP EPROM serving as secure, tamper-resistant boot source with no risk of accidental rewrites. Use Value: Pin compatibility with AT27C256R enables cost-effective upgrade of aging 5 V designs without PCB redesign. |
| Medical Diagnostic Equipment BIOS | Avionics Maintenance Module Memory |
Use Scenario: Storing calibration constants and safety-critical startup routines in portable ultrasound and imaging devices. IC Role / Device Role / Timing Role: Low-voltage OTP memory enabling direct integration with 3.3 V microcontroller buses. Use Value: 3.0 V minimum operating voltage and <1 µA standby current extend battery runtime between recalibrations. |
Use Scenario: Providing certified, unalterable diagnostic firmware in aircraft ground support test modules. IC Role / Device Role / Timing Role: One-time programmable storage for DO-254-compliant boot images requiring traceable manufacturing history. Use Value: Rapid programming and integrated ID code support automated verification in regulated production workflows. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C256R-70JC | 5 V-only operation (4.5–5.5 V); no low-voltage mode; identical pinout and timing at 5 V | Requires dedicated 5 V rail; unsuitable for mixed-voltage or battery-constrained systems | Select when legacy 5 V design stability is prioritized over power savings or voltage flexibility |
| MX29LV256ETTI-90G | Flash-based (reprogrammable), 3.0–3.6 V only, 90 ns access, different command set and pinout | Enables field firmware updates but requires new PCB layout and driver software | Select only if reprogrammability justifies redesign; not a drop-in replacement |
Compared with AT27C256R-70JC, the AT27LV256A-15JI adds low-voltage operation and lower standby power but retains identical footprint and 5 V read compatibility; compared with MX29LV256ETTI-90G, it offers true OTP security and pin compatibility but lacks reprogrammability - making AT27LV256A-15JI optimal for fixed-function, long-lifecycle industrial deployments.
Availability
AT27LV256A-15JI is available at Aetrix Electronics and suitable for industrial control systems, legacy telecom infrastructure upgrades, and medical diagnostic equipment requiring stable component supply across extended product lifecycles.
Supply support for AT27LV256A-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 was a U.S.-based semiconductor manufacturer specializing in microcontrollers, nonvolatile memory, and programmable logic, acquired by Microchip Technology in 2016.
The AT27LV256A-15JI belongs to Atmel's low-voltage OTP EPROM product line, designed specifically for power-sensitive, long-lifecycle embedded applications where firmware immutability, industrial reliability, and voltage flexibility are critical.
FAQ
What is the maximum read access time specified for AT27LV256A-15JI?
The AT27LV256A-15JI has a maximum read access time of 150 ns under industrial temperature conditions (−40°C to +85°C) and VCC = 3.0–3.6 V or 4.5–5.5 V. This value corresponds to the "-15" speed grade in the ordering code and is fully characterized across the entire operating voltage and temperature range.
Can AT27LV256A-15JI operate reliably with a 3.3 V supply in a system using 5 V TTL logic?
Yes, the AT27LV256A-15JI produces TTL-compatible output levels (VOH ≥ 2.4 V, VOL ≤ 0.4 V) when powered at VCC = 3.0 V, enabling direct interface with standard 5 V TTL inputs without level-shifting circuitry. Input thresholds also meet LVTTL specifications, ensuring robust signal integrity.
Is AT27LV256A-15JI pin-compatible with AT27C256R devices?
Yes, the AT27LV256A-15JI uses the same 32-lead PLCC pinout as the JEDEC-standard AT27C256R, including identical placement of A0–A14, O0–O7, CE, OE, VCC, GND, and VPP. Pins 1 and 17 are NC on both devices, confirming mechanical and electrical drop-in compatibility in existing sockets.
What programming voltage and sequence are required for AT27LV256A-15JI?
The AT27LV256A-15JI requires VPP = 13.0 ± 0.25 V and VCC = 6.5 ± 0.25 V during programming, with VCC applied simultaneously with or before VPP and removed simultaneously with or after VPP. A 0.1 µF capacitor must be placed between VPP and GND to suppress transients.
Does AT27LV256A-15JI support product identification reading, and how is it accessed?
Yes, the AT27LV256A-15JI includes an Integrated Product Identification Code. To read it, hold A1–A14 low, apply VH = 12.0 V to A9, and toggle A0: low for Manufacturer ID (0x1E), high for Device Code (0x8C). This feature is used by industry-standard programmers to auto-detect and configure programming algorithms.
AT27LV256A-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:
- 3V ~ 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)
AT27LV256A-15JI FAQ
1.How can I place an order for AT27LV256A-15JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27LV256A-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 AT27LV256A-15JI reliable?
The price and inventory of AT27LV256A-15JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27LV256A-15JI is usually 5 days.
3.What payment methods are accepted for AT27LV256A-15JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27LV256A-15JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27LV256A-15JI?
AT27LV256A-15JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27LV256A-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 AT27LV256A-15JI?
For technical support, including AT27LV256A-15JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27LV256A-15JI requirements.
6.How does Aetrix verify that AT27LV256A-15JI is sourced from the original manufacturer or authorized distributors?
All AT27LV256A-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 AT27LV256A-15JI meets industry standards.
7.What is the process for return or replacement of AT27LV256A-15JI?
All AT27LV256A-15JI units undergo pre-shipment inspection (PSI). If there is an issue with AT27LV256A-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 AT27LV256A-15JI part is unused and in its original packaging.
Return procedure for AT27LV256A-15JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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