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Microchip Technology AT27LV256A-12RC
- Part No.:
- AT27LV256A-12RC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-SOIC (0.342", 8.69mm Width)
- Datasheet:
-
AT27LV256A-12RC.pdf
- Description:
- IC EPROM 256KBIT PARALLEL 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,454
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Product details
Overview
AT27LV256A-12RC from Atmel is a 262,144-bit (32K × 8) one-time programmable EPROM optimized for low-voltage battery-powered systems, featuring 120 ns read access time, dual 3.0–3.6 V or 4.5–5.5 V supply operation, and JEDEC-standard 28-lead SOIC packaging. It delivers TTL-compatible outputs at 3.0 V and supports rapid programming at 100 µs/byte.
For engineers reviewing the AT27LV256A-12RC datasheet, AT27LV256A-12RC pinout, AT27LV256A-12RC application, or AT27LV256A-12RC equivalent, key selection criteria include its OTP architecture, dual-voltage compatibility, standby current ≤20 µA at 3.6 V, 120 ns tACC timing grade, and pin-for-pin equivalence with AT27C256R in SOIC package.
Technical Context
The AT27LV256A-12RC implements a CMOS-based OTP EPROM array with two-line control (CE/OE), enabling bus contention avoidance in shared-memory systems. Its architecture supports both 3.3 V and 5 V logic interfacing without level shifters, and integrates product identification code for automated programming equipment recognition.
It operates in five distinct modes-Read, Output Disable, Standby, Rapid Program, and Product Identification-each defined by specific CE, OE, VPP, and address pin states. Programming requires VCC = 6.5 V and VPP = 13.0 V, while read/standby modes strictly require VCC within 3.0–3.6 V or 4.5–5.5 V ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 262,144 bits (32K × 8), fixed OTP storage for firmware/boot code |
| Read Access Time (tACC) | 120 ns max at VCC = 3.0–3.6 V, defines minimum CPU wait-state requirement |
| Supply Voltage Range | 3.0–3.6 V or 4.5–5.5 V - enables drop-in use in mixed-voltage legacy and portable systems |
| Standby Current (ISB1) | 20 µA max at VCC = 3.6 V, supports ultra-low-power sleep modes in battery devices |
| Active Power Dissipation | 29 mW max at 5 MHz and VCC = 3.6 V, reduces thermal load in dense PCB layouts |
| Programming Speed | 100 µs/byte typical using Rapid™ algorithm, cuts production programming time vs. standard EPROMs |
| ESD Protection | 2,000 V HBM - ensures robustness during handling and board assembly |
Pinout & Package
AT27LV256A-12RC is supplied in a 28-lead 330-mil SOIC (package code 28R), JEDEC MS-012 compliant, with 1.27 mm lead pitch and body dimensions 17.9 × 7.6 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus supporting full 32K-byte addressing; TTL/CMOS compatible |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus; outputs drive TTL loads directly at 3.0 V |
| CE | Chip Enable | Active-low chip select; controls device activation and standby entry |
| OE | Output Enable | Active-low output gate; allows multiple devices on same data bus |
| VPP | Programming Voltage | 13.0 V input required only during programming; must be applied after VCC |
| VCC | Power Supply | Primary supply for read/standby (3.0–3.6 V or 4.5–5.5 V); powers internal logic and I/O |
| GND | Ground Reference | Signal and power return; decoupling capacitor (0.1 µF ceramic) required per device |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage operation | Single part supports both 3.3 V embedded systems and 5 V legacy backplanes without redesign |
| Rapid™ Programming | 100 µs/byte typical - reduces programming station cycle time and improves yield in high-volume manufacturing |
| Integrated ID Code | Manufacturer byte (1Eh) and device code (8Ch) enable auto-detection by programmers, eliminating manual setup errors |
| JEDEC pin compatibility | Pin-for-pin match with AT27C256R in SOIC package - allows direct replacement in existing 5 V designs |
| Low-power standby | ≤20 µA ISB1 at 3.6 V - extends battery life in handheld instruments and remote sensors |
Applications
| Industrial Control Firmware Storage | Portable Medical Device Boot Memory |
|---|---|
Use Scenario: Storing immutable boot firmware and calibration tables in PLC modules operating across -40°C to +85°C. IC Role / Device Role / Timing Role: OTP EPROM providing nonvolatile instruction storage with guaranteed data retention >10 years. Use Value: Eliminates need for external UV-erasable EPROM sockets and quartz windows; withstands industrial ESD and latchup stress. |
Use Scenario: Holding certified bootloader and safety-critical initialization code in battery-powered glucose meters and pulse oximeters. IC Role / Device Role / Timing Role: Low-voltage memory enabling direct 3.3 V MCU interface without voltage translation. Use Value: 20 µA standby current extends single-cell Li-ion battery life to >6 months in sleep mode. |
| Legacy PC Add-in Card BIOS | Automotive Diagnostic Tool Memory |
Use Scenario: Replacing obsolete 5 V EPROMs in ISA-bus expansion cards requiring field-upgradable firmware. IC Role / Device Role / Timing Role: Pin-compatible drop-in replacement for AT27C256R with identical SOIC footprint and timing. Use Value: Enables continued production of legacy hardware using modern low-power silicon without PCB rework. |
Use Scenario: Storing diagnostic protocol stacks and vehicle-specific configuration maps in handheld OBD-II scanners. IC Role / Device Role / Timing Role: OTP storage immune to accidental overwrite during vehicle ECU communication sessions. Use Value: 2,000 V ESD rating ensures reliability in automotive service environments with frequent static discharge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C256R-12RC | 5 V-only operation (4.5–5.5 V); no low-voltage mode; identical pinout and timing | Restricted to 5 V systems; cannot operate below 4.5 V | Select when system lacks 3.3 V rail and requires maximum noise margin |
| MX27C256 (Macronix) | Same 32K×8 OTP architecture; 120 ns speed grade; requires 12.5 V VPP; no integrated ID code | Lacks auto-programmer identification; may require manual algorithm selection in programming tools | Select for cost-sensitive volume production where ID code is not used |
Compared with AT27C256R-12RC, the AT27LV256A-12RC adds 3.3 V operation and lower standby power but retains identical SOIC pinout and programming flow; versus MX27C256, it provides integrated ID coding and tighter VPP tolerance, simplifying production programming validation.
Availability
AT27LV256A-12RC is available at Aetrix Electronics and suitable for industrial control firmware storage, portable medical device boot memory, and legacy PC add-in card BIOS requiring stable component supply and long-term obsolescence management.
Supply support for AT27LV256A-12RC 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) was a leading designer of nonvolatile memory and microcontroller ICs, known for innovation in low-power OTP and flash technologies.
The AT27LV256A-12RC belongs to Atmel's LV-series OTP EPROM family, engineered specifically for battery-powered and dual-voltage embedded systems needing reliable, low-power, field-programmable firmware storage.
FAQ
What voltage ranges does the AT27LV256A-12RC support for normal read operation?
The AT27LV256A-12RC supports two distinct supply ranges for read and standby modes: 3.0 V to 3.6 V (low-voltage mode) and 4.5 V to 5.5 V (standard 5 V mode). It does not operate reliably outside these ranges during active use. Programming requires separate VPP = 13.0 V and VCC = 6.5 V, per the AC Programming Characteristics table in the datasheet.
Is the AT27LV256A-12RC pin-compatible with the AT27C256R in SOIC packaging?
Yes, the AT27LV256A-12RC is pin-compatible with the AT27C256R when both are in the 28-lead SOIC (28R) package. Pin functions, numbering, and physical layout match exactly, enabling direct replacement in existing 5 V designs - though AT27LV256A-12RC adds 3.3 V operation and lower power consumption.
What is the purpose of the VPP pin on the AT27LV256A-12RC, and when is it used?
The VPP pin on the AT27LV256A-12RC supplies 13.0 V programming voltage exclusively during OTP programming cycles. It is unused and must be tied to VCC (or left floating per design guidance) during normal read/standby operation. The device will not program correctly if VPP is omitted or incorrectly biased during programming sequences.
Does the AT27LV256A-12RC support automatic device identification during programming?
Yes, the AT27LV256A-12RC includes an Integrated Product Identification Code with Manufacturer ID (1Eh) and Device Code (8Ch), accessible via A9 = 12.0 V and A0 toggled. This allows industry-standard programmers to auto-detect the part and apply correct algorithms and voltages without manual configuration - a feature confirmed in the datasheet's "Atmel's 27LV256A Integrated Product Identification Code" section.
What decoupling capacitance is required for stable operation of the AT27LV256A-12RC?
The AT27LV256A-12RC requires a 0.1 µF high-frequency ceramic capacitor placed between VCC and GND, mounted as close to the device pins as possible. For boards with multiple EPROMs, a 4.7 µF bulk electrolytic capacitor should also be added near the power entry point - both values are specified in the "System Considerations" section of the datasheet to suppress transient excursions during CE switching.
AT27LV256A-12RC 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:
- 120 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-12RC FAQ
1.How can I place an order for AT27LV256A-12RC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27LV256A-12RC 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-12RC reliable?
The price and inventory of AT27LV256A-12RC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27LV256A-12RC is usually 5 days.
3.What payment methods are accepted for AT27LV256A-12RC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27LV256A-12RC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27LV256A-12RC?
AT27LV256A-12RC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27LV256A-12RC 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-12RC?
For technical support, including AT27LV256A-12RC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27LV256A-12RC requirements.
6.How does Aetrix verify that AT27LV256A-12RC is sourced from the original manufacturer or authorized distributors?
All AT27LV256A-12RC 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-12RC meets industry standards.
7.What is the process for return or replacement of AT27LV256A-12RC?
All AT27LV256A-12RC units undergo pre-shipment inspection (PSI). If there is an issue with AT27LV256A-12RC, 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-12RC part is unused and in its original packaging.
Return procedure for AT27LV256A-12RC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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