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Microchip Technology AT27LV256A-12JC
- Part No.:
- AT27LV256A-12JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT27LV256A-12JC.pdf
- Description:
- IC EPROM 256KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,462
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Product details
Overview
AT27LV256A-12JC from Atmel is a 256K-bit (32K × 8) one-time programmable EPROM optimized for low-voltage battery-powered systems, featuring 120 ns read access time, dual 3.0–3.6V or 4.5–5.5V supply operation, and JEDEC-standard PLCC-32 packaging. It delivers TTL-compatible outputs at 3.0V and supports rapid programming at 100 µs/byte.
For engineers reviewing the AT27LV256A-12JC datasheet, AT27LV256A-12JC pinout, AT27LV256A-12JC application, or AT27LV256A-12JC equivalent, key selection criteria include its 120 ns tACC timing grade, 32-lead PLCC mechanical compatibility with legacy AT27C256R designs, standby current ≤20 µA at 3.6V, and integrated product identification code for automated programming verification.
Technical Context
The AT27LV256A-12JC implements a CMOS OTP EPROM architecture with two-line control (CE/OE), enabling bus contention prevention in shared-memory systems. Its dual-voltage design allows direct interoperability with both 3.3V logic and 5V host systems without level-shifting.
It uses Atmel's Rapid™ Programming Algorithm with 100 µs CE pulses and on-chip product identification (Manufacturer ID = 0x1E, Device ID = 0x8C) to ensure programming equipment compatibility. VPP = 13.0V is required only during programming; read mode operates with VCC alone.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32K × 8) - supports firmware storage for microcontroller boot code or configuration data |
| Read Access Time (tACC) | 120 ns max - meets timing requirements for 8 MHz Z80 or 68K-based embedded controllers |
| Supply Voltage Range | 3.0–3.6V or 4.5–5.5V - enables drop-in use in mixed-voltage legacy boards and portable 3.3V systems |
| Standby Current (ISB1) | 20 µA max at VCC = 3.6V - extends battery life in always-on industrial monitoring devices |
| Programming Speed | 100 µs/byte typical - reduces production programming cycle time vs. standard 5V EPROMs |
| ESD Protection | 2,000V HBM - ensures robustness during manual handling and board assembly |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade instrumentation and peripheral cards |
Pinout & Package
AT27LV256A-12JC is supplied in a 32-lead Plastic J-Leaded Chip Carrier (PLCC) package per JEDEC MS-016 AE. Pins 1 and 17 are No Connect (NC). The package is lead-free compatible and RoHS-compliant per Atmel documentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus interface supporting full 32K-word addressing |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus outputs compatible with TTL and LVTTL logic levels |
| CE | Chip Enable | Active-low chip select; controls device activation and power-down entry |
| OE | Output Enable | Active-low output gate; enables data bus drive without affecting internal state |
| VCC | Power Supply | Primary supply input for read/standby modes (3.0–3.6V or 4.5–5.5V) |
| VPP | Programming Voltage | 13.0V programming supply; must be applied after and removed before VCC |
| GND | Ground Reference | Signal and power return path; requires local 0.1 µF ceramic decoupling |
| NC | No Connect | Pins 1 and 17 are unconnected; must remain floating per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC Pin Compatibility | Direct replacement for AT27C256R in PLCC-32 sockets - no PCB redesign needed |
| Rapid™ Programming | 100 µs/byte typical programming time - cuts production burn-in duration by >60% vs. legacy EPROMs |
| Integrated Product ID | Manufacturer ID (0x1E) and Device ID (0x8C) - enables automatic algorithm selection in universal programmers |
| Low-Power Standby | ≤20 µA ICC at 3.6V - supports multi-year battery operation in remote sensor nodes |
| TTL-Level Output at 3.0V | VOH ≥ 2.4V, VOL ≤ 0.4V driving 2.1 mA - eliminates level shifters when interfacing with 5V microcontrollers |
Applications
| Industrial Control Firmware Storage | Legacy PC Add-in Card BIOS |
|---|---|
Use Scenario: Storing boot firmware for PLC I/O modules operating in 0°C–70°C environments with 3.3V main power rails. IC Role / Device Role / Timing Role: Nonvolatile program memory providing deterministic 120 ns read latency to meet real-time scan cycle deadlines. Use Value: Eliminates need for external voltage translators while maintaining compatibility with existing AT27C256R-based schematics. |
Use Scenario: BIOS storage on ISA-bus expansion cards designed for dual-voltage motherboards (3.3V/5V). IC Role / Device Role / Timing Role: OTP ROM holding initialization code executed during POST, accessed via 8-bit data bus and 15-bit address bus. Use Value: Enables single-part sourcing across 3.3V laptop docking stations and 5V desktop systems without board variants. |
| Portable Medical Diagnostic Device | Automated Test Equipment (ATE) Calibration Data |
Use Scenario: Holding calibration constants and safety-critical startup routines in handheld ECG analyzers powered by Li-ion batteries. IC Role / Device Role / Timing Role: Low-power nonvolatile memory ensuring <1 µA typical standby draw to maximize battery runtime between charges. Use Value: Meets IEC 60601 leakage current limits while delivering reliable read performance over 10+ year service life. |
Use Scenario: Storing factory-trimmed DAC/ADC offset/gain coefficients in rack-mounted ATE mainframes. IC Role / Device Role / Timing Role: One-time programmable storage accessed during system power-up to configure precision analog subsystems. Use Value: Integrated product ID prevents misprogramming during high-volume calibration line operations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C256R-12JC | 5V-only operation (4.5–5.5V); no low-voltage mode; identical PLCC-32 pinout and timing | Requires dedicated 5V rail; unsuitable for battery-powered or mixed-voltage systems | Select when legacy 5V-only infrastructure prohibits voltage scaling |
| MX29LV256ETTI-12G | 3V flash memory (not OTP); 120 ns access; 48-pin TSOP; supports erase/rewrite | Enables field firmware updates but introduces complexity in write-protection and endurance management | Select when reprogrammability and higher density are prioritized over OTP security and simplicity |
Compared with AT27C256R-12JC, the AT27LV256A-12JC adds 3.3V operation and lower standby power but retains identical pinout and programming flow; compared with MX29LV256ETTI-12G, it trades reprogrammability for simpler interface, guaranteed data retention, and zero write-cycle overhead in fixed-function systems.
Availability
AT27LV256A-12JC is available at Aetrix Electronics and suitable for industrial control firmware storage, legacy PC add-in card BIOS, and portable medical diagnostic device applications requiring stable component supply and long-term obsolescence support.
Supply support for AT27LV256A-12JC 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 secure authentication ICs for embedded systems.
The AT27LV256A belongs to Atmel's low-voltage OTP EPROM product line, designed specifically for cost-sensitive, battery-operated, and dual-voltage legacy upgrade applications where data integrity and programming simplicity are critical.
FAQ
What is the maximum operating temperature range for the AT27LV256A-12JC?
The AT27LV256A-12JC is rated for commercial temperature operation from 0°C to +70°C. This specification is defined in the Ordering Information table and confirmed in the Absolute Maximum Ratings section. Industrial-grade variants (e.g., AT27LV256A-12JI) extend the range to –40°C to +85°C, but the -12JC suffix explicitly denotes the commercial grade. The device maintains full timing compliance and electrical specifications across this range.
Does the AT27LV256A-12JC require an external VPP supply during normal read operation?
No, the AT27LV256A-12JC does not require VPP during read or standby modes. VPP = 13.0V is only applied during programming and verification cycles, as specified in the DC Programming Characteristics table. In read mode, the device operates solely from VCC (3.0–3.6V or 4.5–5.5V), simplifying power design and eliminating the need for a dedicated high-voltage generator in end applications.
Is the AT27LV256A-12JC pin-compatible with the AT27C256R series?
Yes, the AT27LV256A-12JC is JEDEC-pin-compatible with the AT27C256R in the 32-lead PLCC package. Pin functions, numbering, and physical layout match exactly, including NC assignments at pins 1 and 17. This allows direct substitution in existing AT27C256R-12JC sockets without PCB modification, provided system-level voltage and timing constraints are verified.
What decoupling capacitance is required for stable operation of the AT27LV256A-12JC?
The AT27LV256A-12JC requires a minimum 0.1 µF high-frequency ceramic capacitor placed between VCC and GND, mounted as close as possible to the device pins. For systems with multiple EPROMs, a bulk 4.7 µF electrolytic capacitor should also be added near the power entry point. These values are mandated in the System Considerations section to suppress transient excursions during CE switching and ensure data sheet compliance.
How is the product identification code accessed on the AT27LV256A-12JC?
The AT27LV256A-12JC provides a two-byte product ID (Manufacturer ID = 0x1E, Device ID = 0x8C) accessed by setting A9 = 12.0V (VH), A0 toggled between VIL/VIH, and all other address lines low. This occurs in Product Identification mode, triggered with CE = OE = VIL. The ID is used by industry-standard programmers to auto-select correct algorithms and verify device authenticity before programming the AT27LV256A-12JC.
AT27LV256A-12JC 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:
- 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:
- 32-PLCC (13.97x11.43)
AT27LV256A-12JC FAQ
1.How can I place an order for AT27LV256A-12JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27LV256A-12JC 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-12JC reliable?
The price and inventory of AT27LV256A-12JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27LV256A-12JC is usually 5 days.
3.What payment methods are accepted for AT27LV256A-12JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27LV256A-12JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27LV256A-12JC?
AT27LV256A-12JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27LV256A-12JC 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-12JC?
For technical support, including AT27LV256A-12JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27LV256A-12JC requirements.
6.How does Aetrix verify that AT27LV256A-12JC is sourced from the original manufacturer or authorized distributors?
All AT27LV256A-12JC 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-12JC meets industry standards.
7.What is the process for return or replacement of AT27LV256A-12JC?
All AT27LV256A-12JC units undergo pre-shipment inspection (PSI). If there is an issue with AT27LV256A-12JC, 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-12JC part is unused and in its original packaging.
Return procedure for AT27LV256A-12JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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