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Microchip Technology AT27LV256A-15RI
- Part No.:
- AT27LV256A-15RI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-SOIC (0.342", 8.69mm Width)
- Datasheet:
-
AT27LV256A-15RI.pdf
- Description:
- IC EPROM 256KBIT PARALLEL 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,521
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Product details
Overview
AT27LV256A-15RI from Atmel is a 262,144-bit (32K × 8) one-time programmable EPROM optimized for low-voltage battery-powered systems, featuring 150 ns maximum read access time, dual 3.0–3.6 V or 4.5–5.5 V supply operation, and industrial temperature range (−40°C to +85°C). It delivers TTL-compatible outputs at 3.0 V and supports rapid programming at 100 µs/byte.
For engineers reviewing the AT27LV256A-15RI datasheet, AT27LV256A-15RI pinout, AT27LV256A-15RI application, or AT27LV256A-15RI equivalent, key selection criteria include standby current ≤20 µA at 3.6 V, JEDEC-standard 28-pin SOIC packaging, pin compatibility with AT27C256R, and verified OTP reliability in embedded firmware storage and legacy system upgrades.
Technical Context
The AT27LV256A-15RI implements a CMOS-based OTP memory architecture with two-line control (CE/OE), enabling bus contention avoidance in multi-device systems. Its dual-voltage design allows seamless integration into mixed-supply environments-operating at 3.3 V for low-power portables while maintaining TTL-level output compatibility with 5 V logic.
It uses Atmel's Rapid™ Programming Algorithm with 100 µs/byte typical write cycles and integrated product identification (Manufacturer ID = 0x1E, Device ID = 0x8C) for automated programmer recognition. Programming requires VCC = 6.5 V and VPP = 13.0 V, with strict sequencing (VCC applied before/with VPP) to ensure reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 262,144 bits (32K × 8), sufficient for boot code or configuration data in microcontroller-based systems |
| Read Access Time | 150 ns max at VCC = 3.0–3.6 V or 4.5–5.5 V, enabling use in 6.7 MHz synchronous bus interfaces |
| Supply Voltage Range | 3.0–3.6 V or 4.5–5.5 V - supports dual-supply host cards and backward compatibility with 5 V systems |
| Standby Current | ≤20 µA at VCC = 3.6 V (CMOS mode), critical for battery life in portable instrumentation |
| Active Power Dissipation | 29 mW max at 5 MHz and VCC = 3.6 V, enabling thermal-safe placement in dense PCB layouts |
| ESD Protection | 2,000 V HBM - meets industrial handling requirements without external protection circuitry |
| Operating Temperature | −40°C to +85°C - qualified for industrial control, automotive body electronics, and telecom line cards |
Pinout & Package
AT27LV256A-15RI is supplied in a 28-lead, 0.330" wide plastic SOIC (package code 28R), JEDEC MS-012 compliant, with 1.27 mm lead pitch and surface-mount gull-wing terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus supporting full 32K-word decoding; driven by microcontroller or FPGA address lines |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus; TTL-compatible at 3.0 V, drives standard 5 V logic loads directly |
| CE | Chip Enable | Active-low chip select; controls device activation and enables low-power standby when high |
| OE | Output Enable | Active-low output gate; used with CE to manage bus contention and reduce switching noise |
| VCC | Power Supply | Primary supply input; must be applied before/with VPP during programming to prevent latchup |
| GND | Ground Reference | Signal and power return; requires local 0.1 µF ceramic decoupling per device |
| VPP | Programming Voltage | 13.0 V programming supply; routed separately with dedicated 0.1 µF capacitor to ground |
Key Features
| Feature | Design Value |
|---|---|
| Pin Compatibility | Fully JEDEC-pin-compatible with AT27C256R - enables drop-in replacement in existing 5 V designs without layout change |
| Rapid™ Programming | 100 µs/byte typical programming time - reduces production test cycle time by >70% vs. legacy EPROMs |
| Integrated ID Code | Manufacturer ID (0x1E) and Device ID (0x8C) accessible via A9/VH and A0 toggle - ensures correct algorithm selection in automated programmers |
| Low-Power Standby | ≤1 µA typical ISB at 3.3 V - extends battery runtime in handheld diagnostic tools and remote sensors |
| Two-Line Control | Independent CE and OE inputs - allows flexible bus arbitration and eliminates need for external tri-state logic |
Applications
| Industrial PLC Firmware Storage | Legacy System BIOS Replacement |
|---|---|
Use Scenario: Storing fixed ladder logic and I/O mapping tables in DIN-rail mounted programmable logic controllers operating in factory-floor environments. IC Role / Device Role / Timing Role: Nonvolatile firmware storage with guaranteed retention over 10 years and immunity to voltage transients on 24 V DC rails. Use Value: Industrial temperature rating (−40°C to +85°C) and 2,000 V ESD protection eliminate field failures in electrically noisy automation settings. |
Use Scenario: Replacing obsolete 5 V EPROMs in aging PC motherboards and embedded x86-based controllers where board space and pinout are fixed. IC Role / Device Role / Timing Role: Drop-in OTP memory providing identical timing and signal levels as AT27C256R while reducing system power draw. Use Value: Pin-for-pin compatibility and TTL-level outputs at 3.0 V allow direct substitution without redesign, lowering obsolescence risk and NRE cost. |
| Portable Medical Diagnostic Device Boot ROM | Telecom Line Card Configuration Memory |
Use Scenario: Holding boot firmware and calibration constants in handheld ultrasound or glucose meter units powered by single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Low-voltage OTP memory enabling 3.3 V system operation with <1 µA standby current to maximize battery life between charges. Use Value: 3.0–3.6 V operation and 29 mW active power at 5 MHz meet stringent portable medical power budgets without requiring voltage translation. |
Use Scenario: Storing hardware configuration and initialization parameters on carrier-grade DSLAM or optical line terminal line cards. IC Role / Device Role / Timing Role: Reliable, long-life nonvolatile memory immune to power cycling and thermal cycling across 10+ year deployments. Use Value: High-reliability CMOS process and 200 mA latchup immunity ensure stable operation in telecom central office environments with shared power domains. |
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 | 5 V only (4.5–5.5 V), no low-voltage operation; 70 ns access, higher ICC (20 mA) | Requires 5 V rail; unsuitable for battery-powered or mixed-supply systems | Select when legacy 5 V design forbids voltage scaling and faster access is needed |
| MN63C256A-15PL | Same 32K×8 OTP structure, 150 ns access, but lacks integrated ID code and Rapid™ programming | Requires manual algorithm setup in programmers; no automatic device recognition | Select when cost sensitivity outweighs programming efficiency and ID verification needs |
Compared with AT27C256R-70PC and MN63C256A-15PL, the AT27LV256A-15RI uniquely combines dual-voltage support, sub-1 µA standby, and automated programming ID - making it the only choice for upgrading legacy systems to lower power without sacrificing pin compatibility or production throughput.
Availability
AT27LV256A-15RI is available at Aetrix Electronics and suitable for industrial control, legacy system upgrades, and portable medical diagnostics requiring stable component supply, long-term lifecycle assurance, and JEDEC-standard SOIC packaging.
Supply support for AT27LV256A-15RI 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 AT27LV256A product line was designed specifically for low-voltage, high-reliability OTP memory replacement in embedded systems where power efficiency, industrial temperature tolerance, and pin compatibility with legacy 5 V EPROMs are mandatory.
FAQ
What is the maximum read access time specified for AT27LV256A-15RI?
The AT27LV256A-15RI has a maximum read access time of 150 ns under all valid operating conditions - including both 3.0–3.6 V and 4.5–5.5 V supply ranges and across the full industrial temperature range (−40°C to +85°C). This value is guaranteed and 100% tested per the datasheet AC characteristics table.
Does AT27LV256A-15RI require a separate programming voltage, and what are the sequencing requirements?
Yes, AT27LV256A-15RI requires VPP = 13.0 V ± 0.25 V for programming. VCC must be applied simultaneously with or before VPP, and removed simultaneously with or after VPP. Failure to observe this sequencing risks latchup or permanent damage. A 0.1 µF capacitor is mandatory between VPP and GND during programming.
Is AT27LV256A-15RI pin-compatible with AT27C256R, and does it support the same programming equipment?
Yes, AT27LV256A-15RI is fully JEDEC-pin-compatible with AT27C256R and programs identically using the same equipment. It shares the same Rapid™ algorithm, integrated ID code (0x1E/0x8C), and programming voltage profile - enabling direct substitution without hardware or software changes to the programming station.
What is the standby current specification for AT27LV256A-15RI at 3.3 V?
The AT27LV256A-15RI specifies a maximum standby current (ISB1) of 20 µA at VCC = 3.6 V in CMOS mode (CE = VCC ± 0.3 V). Typical standby current is less than 1 µA at 3.3 V, making it suitable for ultra-low-power applications such as battery-backed firmware storage.
Which package type does AT27LV256A-15RI use, and are there footprint-compatible alternatives?
AT27LV256A-15RI uses the 28-lead, 0.330" wide SOIC package (code 28R). It is footprint-compatible with other 28-pin SOIC variants of the AT27LV256A family (e.g., -15JC in PLCC or -15TI in TSOP), but mechanical mounting and reflow profiles differ - only the 28R variant matches the SOIC land pattern.
AT27LV256A-15RI 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:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOIC
AT27LV256A-15RI FAQ
1.How can I place an order for AT27LV256A-15RI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27LV256A-15RI 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-15RI reliable?
The price and inventory of AT27LV256A-15RI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27LV256A-15RI is usually 5 days.
3.What payment methods are accepted for AT27LV256A-15RI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27LV256A-15RI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27LV256A-15RI?
AT27LV256A-15RI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27LV256A-15RI 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-15RI?
For technical support, including AT27LV256A-15RI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27LV256A-15RI requirements.
6.How does Aetrix verify that AT27LV256A-15RI is sourced from the original manufacturer or authorized distributors?
All AT27LV256A-15RI 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-15RI meets industry standards.
7.What is the process for return or replacement of AT27LV256A-15RI?
All AT27LV256A-15RI units undergo pre-shipment inspection (PSI). If there is an issue with AT27LV256A-15RI, 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-15RI part is unused and in its original packaging.
Return procedure for AT27LV256A-15RI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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