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Microchip Technology AT27LV256A-15RC
- Part No.:
- AT27LV256A-15RC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-SOIC (0.342", 8.69mm Width)
- Datasheet:
-
AT27LV256A-15RC.pdf
- Description:
- IC EPROM 256KBIT PARALLEL 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,519
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Product details
Overview
AT27LV256A-15RC from Atmel is a 256K-bit (32K × 8) one-time programmable EPROM optimized for low-voltage battery-powered systems, featuring 150 ns maximum read access time, dual 3.0–3.6V or 4.5–5.5V supply operation, and JEDEC-standard 28-pin SOIC packaging. It delivers TTL-compatible outputs at 3.0V and supports rapid programming at 100 µs/byte.
For engineers reviewing the AT27LV256A-15RC datasheet, AT27LV256A-15RC pinout, AT27LV256A-15RC application, or AT27LV256A-15RC equivalent, key selection criteria include standby current ≤20 µA at 3.6V, VPP = 13.0V programming voltage, CMOS/TTL I/O compatibility, and pin compatibility with AT27C256R in SOIC footprint.
Technical Context
The AT27LV256A-15RC implements a two-line control architecture using CE (Chip Enable) and OE (Output Enable) to manage bus contention and enable high-impedance output states during standby or disable modes. Its internal memory array is organized as 32,768 words × 8 bits, accessed via 15 address lines (A0–A14) and latched by valid CE/OE timing windows.
It supports three distinct operating modes: Read (CE=OE=VIL), Output Disable (CE=VIL, OE=VIH), and Standby (CE=VIH). Programming requires VCC = 6.5V and VPP = 13.0V, with Rapid™ algorithm applying 95–105 µs CE pulses per byte and verifying each location before advancing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32K × 8) OTP EPROM - fixed storage capacity, non-rewritable after programming |
| Read Access Time | 150 ns max - defines minimum clock cycle for reliable data fetch in microcontroller boot or firmware lookup |
| Supply Voltage Range | 3.0–3.6V or 4.5–5.5V - enables dual-voltage system interoperability without level shifters |
| Standby Current | 20 µA max at VCC = 3.6V - enables multi-year battery life in portable instrumentation or remote sensors |
| Programming Voltage | VPP = 13.0 ± 0.25V - requires dedicated high-voltage programming circuitry, not supplied by host MCU |
| I/O Compatibility | CMOS and TTL - ensures direct interface with legacy 5V logic and modern 3.3V controllers without translation |
| ESD Protection | 2,000V HBM - meets industrial handling requirements without additional protection components |
Pinout & Package
AT27LV256A-15RC is housed in a 28-lead, 0.330" wide plastic SOIC (package code 28R), compliant with JEDEC MS-012. Pin 1 is marked by a beveled corner; pin 17 is NC (No Connect).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus accepting 0–32767 to select one of 32K bytes |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus in read mode; high-Z when CE or OE inactive |
| CE | Chip Enable | Active-low global enable; must be asserted before OE to initiate read access |
| OE | Output Enable | Active-low output gate; controls data bus drive vs. high-impedance state |
| VPP | Programming Voltage | 13.0V input required only during programming; must be applied after VCC |
| VCC | Power Supply | 3.0–3.6V or 4.5–5.5V main supply; powers logic and memory array |
| GND | Ground Reference | Common return path for VCC, VPP, and I/O signals; requires local 0.1 µF ceramic decoupling |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical - reduces production programming time by >5× versus conventional EPROMs |
| Dual-Voltage Operation | 3.0–3.6V or 4.5–5.5V - eliminates need for separate 5V rails in mixed-voltage embedded systems |
| Integrated Product ID Code | Manufacturer ID = 0x1E, Device ID = 0x8C - enables automatic algorithm selection in universal programmers |
| JEDEC Pin Compatibility | Pin-for-pin match with AT27C256R in SOIC - allows drop-in replacement in existing 5V designs |
| Latchup Immunity | 200 mA - prevents destructive latchup under transient overvoltage or ESD events |
Applications
| Industrial Control Firmware Storage | Legacy System BIOS Replacement |
|---|---|
Use Scenario: Storing fixed configuration tables and calibration constants in PLC modules operating in -40°C to +85°C environments. IC Role / Device Role / Timing Role: Nonvolatile firmware storage with guaranteed 150 ns read access for real-time I/O scanning cycles. Use Value: Eliminates need for external voltage translators due to 3.0V TTL-level outputs compatible with 5V microcontrollers. |
Use Scenario: Replacing obsolete 5V EPROMs in PC/AT-compatible motherboard BIOS sockets without PCB redesign. IC Role / Device Role / Timing Role: Pin-compatible OTP ROM providing identical 28-pin SOIC footprint and JEDEC timing behavior. Use Value: Enables field upgrade of aging systems using existing programming hardware and socket layout. |
| Portable Medical Instrument Boot Code | Automotive Diagnostic Module Memory |
Use Scenario: Holding boot loader and safety-critical startup routines in handheld glucose meters powered by single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Low-power OTP memory drawing <20 µA in standby to extend battery life beyond 5 years. Use Value: Operates reliably at 3.0V minimum supply, matching battery discharge curve without regulation overhead. |
Use Scenario: Storing diagnostic protocol lookup tables and vehicle-specific calibration maps in OBD-II scan tools. IC Role / Device Role / Timing Role: Radiation-tolerant OTP storage with 2,000V ESD protection for workshop environments. Use Value: Withstands repeated hot-plug events and static discharge during technician handling without data corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C256R-15PC | 5V-only operation (4.5–5.5V); no low-voltage mode; same 150 ns speed and SOIC-28 package | Requires dedicated 5V rail; incompatible with battery-powered 3.3V systems | Select when legacy 5V infrastructure exists and voltage flexibility is unnecessary |
| M27C256B-12F1 | 120 ns access time; 5V-only; 28-pin PSOP package (not SOIC); higher standby current (100 µA) | Not pin-compatible; requires PCB layout change; faster but less power-efficient | Select only if 120 ns timing is mandatory and board revision is feasible |
Compared with AT27C256R-15PC and M27C256B-12F1, the AT27LV256A-15RC uniquely supports dual-voltage operation while maintaining pin compatibility with the AT27C256R family-enabling seamless migration from 5V to low-power systems without hardware redesign.
Availability
AT27LV256A-15RC is available at Aetrix Electronics and suitable for industrial control firmware storage, legacy system BIOS replacement, portable medical instrument boot code, and automotive diagnostic module memory requiring stable component supply across extended temperature ranges.
Supply support for AT27LV256A-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 semiconductor manufacturer specializing in microcontrollers, nonvolatile memory, and secure authentication ICs for embedded applications.
The AT27LV256A product line was designed to deliver low-voltage OTP EPROM functionality for portable, battery-operated, and mixed-voltage industrial systems where power efficiency and pin compatibility with legacy 5V parts are critical.
FAQ
What is the maximum read access time specified for the AT27LV256A-15RC?
The AT27LV256A-15RC has a maximum read access time of 150 ns under standard operating conditions (VCC = 3.0–3.6V or 4.5–5.5V, TA = -40°C to +85°C). This value is guaranteed across both voltage ranges and temperature grades, and is measured from address valid or CE assertion to valid data on O0–O7 outputs.
Does the AT27LV256A-15RC require a separate programming voltage, and what is its value?
Yes, the AT27LV256A-15RC requires VPP = 13.0 ± 0.25V during programming, applied externally alongside VCC = 6.5 ± 0.25V. VPP must be applied after VCC and removed before VCC to prevent device damage. The AT27LV256A-15RC does not support in-system programming without this dedicated high-voltage source.
Is the AT27LV256A-15RC pin-compatible with the AT27C256R in the same SOIC package?
Yes, the AT27LV256A-15RC uses the same 28-lead SOIC (28R) footprint and pinout as the AT27C256R, including identical A0–A14, O0–O7, CE, OE, VCC, GND, and NC assignments. This allows direct physical replacement in existing designs, though voltage domain validation is required for 3.0V operation.
What is the standby current specification for the AT27LV256A-15RC at 3.6V?
The AT27LV256A-15RC specifies a maximum standby current of 20 µA at VCC = 3.6V and TA = 25°C, with typical consumption below 1 µA. This ultra-low quiescent draw is achieved when CE is held high (VIH), placing the device in high-impedance standby mode while preserving stored data indefinitely.
Can the AT27LV256A-15RC operate reliably at 3.0V and still produce TTL-compatible output levels?
Yes, the AT27LV256A-15RC guarantees TTL-compatible VOH ≥ 2.4V and VOL ≤ 0.4V at VCC = 3.0V with IOL = 2.0 mA and IOH = –2.0 mA. This allows direct interfacing with standard 5V TTL logic without level-shifting circuitry, a key feature confirmed in the DC characteristics table for the 3.0–3.6V supply range.
AT27LV256A-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:
- 3V ~ 3.6V, 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOIC
AT27LV256A-15RC FAQ
1.How can I place an order for AT27LV256A-15RC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27LV256A-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 AT27LV256A-15RC reliable?
The price and inventory of AT27LV256A-15RC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27LV256A-15RC is usually 5 days.
3.What payment methods are accepted for AT27LV256A-15RC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27LV256A-15RC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27LV256A-15RC?
AT27LV256A-15RC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27LV256A-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 AT27LV256A-15RC?
For technical support, including AT27LV256A-15RC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27LV256A-15RC requirements.
6.How does Aetrix verify that AT27LV256A-15RC is sourced from the original manufacturer or authorized distributors?
All AT27LV256A-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 AT27LV256A-15RC meets industry standards.
7.What is the process for return or replacement of AT27LV256A-15RC?
All AT27LV256A-15RC units undergo pre-shipment inspection (PSI). If there is an issue with AT27LV256A-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 AT27LV256A-15RC part is unused and in its original packaging.
Return procedure for AT27LV256A-15RC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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