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Microchip Technology AT27LV256A-90RC
- Part No.:
- AT27LV256A-90RC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-SOIC (0.342", 8.69mm Width)
- Datasheet:
-
AT27LV256A-90RC.pdf
- Description:
- IC EPROM 256KBIT PARALLEL 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,923
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Product details
Overview
AT27LV256A-90RC from Atmel is a 32K × 8-bit one-time programmable (OTP) EPROM optimized for low-voltage battery-powered systems, featuring 90 ns read access time at 3.0–3.6 V or 4.5–5.5 V, 20 µA max standby current, and JEDEC-standard 28-pin SOIC packaging. It serves as nonvolatile program storage in embedded controllers and legacy industrial firmware modules.
For engineers reviewing the AT27LV256A-90RC datasheet, AT27LV256A-90RC pinout, AT27LV256A-90RC application, or AT27LV256A-90RC equivalent, key selection criteria include dual-voltage compatibility (3.3 V/5 V), rapid 100 µs/byte programming, TTL/CMOS I/O compatibility, and verified pin equivalence with AT27C256R for drop-in replacement in legacy designs.
Technical Context
The AT27LV256A-90RC implements a standard OTP EPROM architecture with two-line control (CE/OE), supporting fast random-access reads and Rapid™ programming via dedicated VPP (13.0 V) during programming mode. Its internal address decoder maps A0–A14 to 32K locations, with O0–O7 delivering TTL-compatible outputs even when VCC = 3.0 V.
It operates across commercial (0°C to 70°C) and industrial (−40°C to +85°C) temperature ranges, with integrated product identification code (0x1E8C) accessible via A9/VH and A0 toggling. Programming requires strict sequencing: VCC applied before/with VPP, and both removed together to prevent latchup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 262,144 bits (32K × 8), fixed OTP configuration - no erase capability, suitable for immutable firmware storage. |
| Read Access Time | 90 ns maximum at VCC = 3.0–3.6 V or 4.5–5.5 V - defines worst-case latency for instruction fetch or data lookup in real-time systems. |
| Supply Voltage Range | 3.0–3.6 V or 4.5–5.5 V - enables direct integration into mixed-voltage boards without level shifters. |
| Standby Current | 20 µA max at VCC = 3.6 V - supports ultra-low-power sleep modes in portable instrumentation. |
| Programming Speed | 100 µs/byte typical - reduces production programming cycle time versus standard 5 V EPROMs. |
| I/O Compatibility | CMOS and TTL input/output levels - ensures interoperability with legacy 5 V microcontrollers and modern 3.3 V logic. |
| ESD Protection | 2,000 V HBM - enhances robustness during handling and board assembly. |
Pinout & Package
AT27LV256A-90RC is supplied in a 28-lead, 0.330" wide plastic gull-wing small outline (SOIC) package per JEDEC MS-012, with 1.27 mm pitch and surface-mount footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus selecting one of 32K bytes; CMOS/TTL compatible, driven by microcontroller address lines. |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus in read mode; high-impedance when OE or CE inactive - prevents bus contention. |
| CE | Chip Enable | Active-low chip select; controls device activation and power state - critical for multi-device memory decoding. |
| OE | Output Enable | Active-low output gate; decouples data bus without disabling chip - enables shared bus arbitration. |
| VPP | Programming Voltage | 13.0 V ± 0.25 V input during programming only; must be sequenced with VCC to avoid damage. |
| VCC | Power Supply | 3.0–3.6 V or 4.5–5.5 V main supply; powers logic and I/O; requires local 0.1 µF ceramic decoupling. |
| GND | Ground Reference | Common return path for VCC and VPP; must be low-inductance connection to minimize noise coupling. |
| NC | No Connect | Pins 1 and 28 are unconnected - must remain floating per datasheet; not used for thermal or mechanical anchoring. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage operation | Eliminates need for separate 5 V rails in hybrid systems - simplifies power design for field-upgradable cards. |
| Rapid™ Programming Algorithm | Reduces factory programming time by >5× vs. conventional EPROMs - improves throughput in high-mix manufacturing. |
| Integrated Product ID Code | Enables automatic algorithm selection in universal programmers - prevents misprogramming and ensures traceability. |
| JEDEC Pin Compatibility | Direct replacement for AT27C256R without PCB changes - extends life of legacy designs with lower power consumption. |
| 200 mA Latchup Immunity | Withstands transient overcurrent events on I/O or supply pins - increases reliability in noisy industrial environments. |
Applications
| Industrial PLC Firmware Storage | Legacy Medical Device Boot ROM |
|---|---|
Use Scenario: Storing fixed boot code and calibration tables in programmable logic controllers deployed in factory automation cabinets. IC Role / Device Role / Timing Role: Nonvolatile program memory providing deterministic startup sequence and runtime instruction fetch. Use Value: 90 ns access time ensures sub-microsecond response to I/O interrupts; 20 µA standby current minimizes heat buildup in sealed enclosures. |
Use Scenario: Holding immutable diagnostic firmware and safety-critical initialization routines in Class II medical analyzers with long service lifecycles. IC Role / Device Role / Timing Role: OTP EPROM acting as trusted root-of-trust for secure boot verification and hardware self-test execution. Use Value: Rapid programming enables final-stage firmware burn-in during QA; 2,000 V ESD protection ensures reliability during clinical technician handling. |
| Telecom Line Card Configuration | Automotive Body Control Module (BCM) |
Use Scenario: Storing protocol stack parameters and vendor-specific configuration data on telecom line interface cards operating in NEBS-compliant chassis. IC Role / Device Role / Timing Role: Read-only configuration store accessed during card insertion and hot-swap initialization sequences. Use Value: Dual-voltage support allows same BOM across 3.3 V and 5 V backplane variants; JEDEC SOIC package fits constrained board space. |
Use Scenario: Hosting vehicle-specific calibration maps and CAN message routing tables in body control units subject to automotive temperature cycling. IC Role / Device Role / Timing Role: Immutable memory element storing safety-relevant operational constants and fail-safe defaults. Use Value: Industrial temperature range (−40°C to +85°C) guarantees functionality across engine bay thermal extremes; latchup immunity withstands load-dump transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C256R-90PC | 5 V only (4.5–5.5 V), no low-voltage operation; identical pinout and timing (90 ns), but higher 100 µA standby current. | Requires dedicated 5 V rail; unsuitable for battery-powered or mixed-voltage systems. | Select when legacy 5 V infrastructure is fixed and power budget allows higher idle draw. |
| MX27C256AP-90 | Same 32K × 8 OTP structure, 90 ns access, but lacks integrated product ID and Rapid™ programming; requires longer 500 µs/byte programming. | No automatic programmer recognition; manual algorithm setup needed; lower ESD rating (1,500 V). | Choose for cost-sensitive applications where programming speed and traceability are secondary to unit price. |
Compared with AT27LV256A-90RC, AT27C256R-90PC offers identical timing and footprint but sacrifices low-voltage flexibility and power efficiency, while MX27C256AP-90 trades programmability features and robustness for marginal cost reduction - making AT27LV256A-90RC the optimal choice for new designs requiring dual-voltage support and production-ready programming.
Availability
AT27LV256A-90RC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy medical device boot ROM, and telecom line card configuration requiring stable component supply across extended product lifecycles.
Supply support for AT27LV256A-90RC 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 security ICs for embedded applications.
The AT27LV256A product line was designed to extend the lifecycle of EPROM-based systems by enabling migration from 5 V to 3.3 V operation without redesigning PCBs or firmware interfaces.
FAQ
What voltage ranges does the AT27LV256A-90RC support during normal read operation?
The AT27LV256A-90RC supports two distinct supply ranges for read operation: 3.0 V to 3.6 V (low-voltage mode) and 4.5 V to 5.5 V (standard 5 V mode). Both ranges deliver guaranteed 90 ns access time. VCC must remain within these limits during active or standby modes; operation outside these ranges may cause functional failure or accelerated wear.
Is the AT27LV256A-90RC pin-compatible with the AT27C256R series?
Yes, the AT27LV256A-90RC is fully pin-compatible with JEDEC-standard AT27C256R devices in all supported packages (SOIC, PLCC, TSOP). Signal names, pin positions, and electrical behavior match exactly - enabling direct substitution in existing designs without layout changes, provided VPP is properly isolated during 5 V operation.
What is the purpose of the VPP pin on the AT27LV256A-90RC, and how is it used?
The VPP pin on the AT27LV256A-90RC supplies 13.0 V ± 0.25 V exclusively during programming mode to enable Fowler-Nordheim tunneling for OTP cell programming. It must be applied simultaneously with or after VCC and removed simultaneously with or before VCC. A 0.1 µF capacitor between VPP and GND is mandatory to suppress transients that could corrupt programming.
Does the AT27LV256A-90RC support industrial temperature operation?
Yes, the AT27LV256A-90RC is qualified for industrial temperature range operation from −40°C to +85°C. This is confirmed by the "I" suffix in ordering codes (e.g., AT27LV256A-90RI) and validated across all DC/AC specifications including access time, standby current, and I/O voltage thresholds - ensuring reliable performance in harsh environments.
How does the Rapid™ Programming Algorithm improve production efficiency for the AT27LV256A-90RC?
The Rapid™ Programming Algorithm reduces average programming time to 100 µs per byte - approximately five times faster than conventional EPROM algorithms. It achieves this through adaptive pulse-width control and built-in verify-reprogram loops, minimizing test time and increasing throughput in high-volume manufacturing without compromising data retention or endurance.
AT27LV256A-90RC 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:
- 90 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-90RC FAQ
1.How can I place an order for AT27LV256A-90RC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27LV256A-90RC 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-90RC reliable?
The price and inventory of AT27LV256A-90RC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27LV256A-90RC is usually 5 days.
3.What payment methods are accepted for AT27LV256A-90RC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27LV256A-90RC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27LV256A-90RC?
AT27LV256A-90RC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27LV256A-90RC 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-90RC?
For technical support, including AT27LV256A-90RC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27LV256A-90RC requirements.
6.How does Aetrix verify that AT27LV256A-90RC is sourced from the original manufacturer or authorized distributors?
All AT27LV256A-90RC 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-90RC meets industry standards.
7.What is the process for return or replacement of AT27LV256A-90RC?
All AT27LV256A-90RC units undergo pre-shipment inspection (PSI). If there is an issue with AT27LV256A-90RC, 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-90RC part is unused and in its original packaging.
Return procedure for AT27LV256A-90RC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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