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Microchip Technology AT27LV256A-15JC
- Part No.:
- AT27LV256A-15JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT27LV256A-15JC.pdf
- Description:
- IC EPROM 256KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,754
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Product details
Overview
AT27LV256A-15JC from Atmel is a 256K-bit (32K × 8) one-time programmable EPROM with 150 ns maximum access time, dual-voltage operation (3.0–3.6 V or 4.5–5.5 V), and JEDEC-standard 32-lead PLCC packaging. It delivers TTL-compatible outputs at 3.0 V and supports rapid programming at 100 µs/byte, making it suitable for battery-powered portable systems requiring low-power nonvolatile storage.
For engineers reviewing the AT27LV256A-15JC datasheet, AT27LV256A-15JC pinout, AT27LV256A-15JC application, or AT27LV256A-15JC equivalent, key selection criteria include its 150 ns read timing at industrial temperature range (–40°C to +85°C), 20 µA max standby current at 3.6 V, pin compatibility with AT27C256R, and support for both 3.3 V and 5 V host environments without level-shifting.
Technical Context
The AT27LV256A-15JC implements a CMOS OTP EPROM architecture with two-line control (CE/OE), enabling bus contention avoidance in shared-memory systems. Its dual-supply design allows direct interfacing with 3.3 V logic while maintaining TTL-level output swing compatible with 5 V systems.
It uses Atmel's Rapid™ Programming Algorithm with 100 µs/byte typical programming time and integrated product identification code (Manufacturer ID = 0x1E, Device ID = 0x8C). Programming requires VCC = 6.5 V and VPP = 13.0 V, with strict sequencing (VCC applied before/with VPP).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32K × 8) - provides sufficient boot code or firmware storage for 8-bit microcontroller systems. |
| Access Time (tACC) | 150 ns max - enables reliable interface with 6–7 MHz system clocks in read-intensive embedded applications. |
| Supply Voltage Range | 3.0–3.6 V or 4.5–5.5 V - supports mixed-voltage board designs and hot-plug compatibility across 3.3 V and 5 V hosts. |
| Standby Current (ISB1) | 20 µA max at VCC = 3.6 V - reduces quiescent power in always-on or sleep-mode subsystems. |
| Active Current (ICC) | 8 mA max at 5 MHz, VCC = 3.6 V - enables low-power operation in portable instrumentation and handheld devices. |
| Programming Speed | 100 µs/byte typical - cuts firmware update time during manufacturing programming or field reprogramming. |
| ESD Protection | 2,000 V HBM - improves robustness during handling and PCB assembly in industrial environments. |
Pinout & Package
AT27LV256A-15JC 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) and must remain unconnected in layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus supporting full 32K-word addressing; TTL/CMOS compatible. |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus; outputs drive TTL loads directly at 3.0 V supply. |
| CE | Chip Enable | Active-low chip select; controls device activation and entry into standby mode when high. |
| OE | Output Enable | Active-low output gate; enables data output without affecting internal memory state. |
| VCC | Power Supply | Primary supply input; accepts 3.0–3.6 V or 4.5–5.5 V; decoupling capacitor required per datasheet. |
| VPP | Programming Voltage | 13.0 V programming supply; must be sequenced with VCC and isolated via 0.1 µF capacitor to ground. |
| GND | Ground Reference | Signal and power return path; requires low-inductance connection to minimize noise coupling. |
| NC | No Connect | Pins 1 and 17 - physically present but electrically unused; must not be soldered or routed. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage operation | Operates natively at 3.0–3.6 V or 4.5–5.5 V - eliminates need for external voltage translators in hybrid-voltage systems. |
| JEDEC pin compatibility | Pin-for-pin identical to AT27C256R - enables drop-in replacement in legacy 5 V designs with minimal validation. |
| Rapid™ Programming | 100 µs/byte typical programming time - accelerates production programming throughput and reduces test floor dwell time. |
| Integrated ID code | Manufacturer ID (0x1E) and Device ID (0x8C) accessible via A9/VH and A0 toggle - ensures automatic algorithm selection in universal programmers. |
| High-reliability process | 200 mA latchup immunity and 2,000 V ESD protection - meets industrial environmental stress requirements without external protection. |
Applications
| Industrial Control Firmware Storage | Legacy System Boot ROM Replacement |
|---|---|
Use Scenario: Storing boot code and configuration parameters in PLC modules operating in harsh factory environments with wide temperature swings. IC Role / Device Role / Timing Role: Nonvolatile boot ROM providing deterministic startup sequence and calibration data retention. Use Value: 150 ns access time ensures fast initialization under real-time constraints; industrial temperature rating (–40°C to +85°C) guarantees reliability across ambient extremes. |
Use Scenario: Upgrading aging 5 V-based instrumentation systems with lower-power, dual-voltage memory while retaining existing PCB layout. IC Role / Device Role / Timing Role: Pin-compatible OTP EPROM serving as direct functional replacement for AT27C256R in legacy read-only memory slots. Use Value: Eliminates redesign effort due to JEDEC-compliant PLCC footprint and identical pinout; supports both original 5 V and upgraded 3.3 V supply rails. |
| Portable Medical Device Code Storage | Embedded Test Equipment Calibration Data |
Use Scenario: Holding firmware and safety-critical diagnostic routines in handheld patient monitors powered by rechargeable Li-ion batteries. IC Role / Device Role / Timing Role: Low-power OTP memory supplying verified application code during cold start and periodic self-test sequences. Use Value: 20 µA max standby current extends battery life between charges; 3.0 V operation aligns with regulated battery supply rails without additional regulators. |
Use Scenario: Storing calibrated sensor offsets and compensation coefficients in benchtop multimeters and signal analyzers requiring long-term data integrity. IC Role / Device Role / Timing Role: One-time programmable nonvolatile storage for factory-trimmed calibration constants accessed during power-up. Use Value: Rapid programming enables efficient post-calibration write cycles; high-reliability CMOS process ensures >20-year data retention without refresh. |
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); 70 ns access; no low-voltage operation | Requires dedicated 5 V rail; incompatible with 3.3 V systems | Select when legacy 5 V design prohibits voltage scaling and faster timing is needed. |
| MN63C256A-15PL | 3.3 V only; 150 ns access; same PLCC-32 package; no VPP pin | Uses internal charge pump for programming; no external 13 V supply needed | Select when board space is constrained and external high-voltage generation is undesirable. |
Compared with AT27LV256A-15JC, AT27C256R-70PC offers faster access but lacks dual-voltage flexibility, while MN63C256A-15PL simplifies power design by eliminating VPP but sacrifices programming voltage configurability and manufacturer ID verification capability.
Availability
AT27LV256A-15JC is available at Aetrix Electronics and suitable for industrial control systems, portable medical instrumentation, and legacy system upgrades requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for AT27LV256A-15JC 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 industrial, automotive, and consumer applications.
The AT27LV256A-15JC belongs to Atmel's low-voltage OTP EPROM product line, designed specifically for energy-constrained and mixed-voltage embedded systems needing reliable, pin-compatible firmware storage without redesign overhead.
FAQ
What is the operating temperature range for the AT27LV256A-15JC?
The AT27LV256A-15JC is rated for industrial temperature operation from –40°C to +85°C. This specification is confirmed in the Ordering Information table and Operating Modes section of the datasheet, where the "JI" suffix denotes industrial grade. The device maintains full functionality-including 150 ns access time and 20 µA max standby current-across this entire range.
Does the AT27LV256A-15JC require an external 13 V supply for normal operation?
No, the AT27LV256A-15JC requires VPP = 13.0 V only during programming mode. In read or standby modes, VPP may be tied to VCC (3.0–3.6 V or 4.5–5.5 V). The datasheet explicitly states that VPP is used solely for programming and must be sequenced with VCC; no 13 V supply is needed for standard memory access.
Is the AT27LV256A-15JC pin-compatible with the AT27C256R?
Yes, the AT27LV256A-15JC is pin-compatible with the JEDEC-standard AT27C256R, as stated in the Features section and confirmed in the Pin Configurations diagrams. Both use identical 32-lead PLCC pinouts, including matching A0–A14, O0–O7, CE, OE, VCC, GND, and NC assignments-enabling direct PCB-level substitution in existing designs.
What is the meaning of the "-15" in AT27LV256A-15JC?
The "-15" in AT27LV256A-15JC indicates a maximum access time (tACC) of 150 ns under specified operating conditions. This timing grade is validated across both voltage ranges (3.0–3.6 V and 4.5–5.5 V) and the full industrial temperature range, as documented in the AC Characteristics table on page 5 of the datasheet.
Can the AT27LV256A-15JC be programmed using standard EPROM programmers?
Yes, the AT27LV256A-15JC programs identically to the AT27C256R and uses the same programming equipment, as confirmed in the Description and Programming Waveforms sections. Its Integrated Product Identification Code (0x1E/0x8C) ensures automatic algorithm selection in industry-standard programmers, and the Rapid™ Programming Algorithm is fully supported without firmware modification.
AT27LV256A-15JC 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:
- 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:
- 32-PLCC (13.97x11.43)
AT27LV256A-15JC FAQ
1.How can I place an order for AT27LV256A-15JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27LV256A-15JC 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-15JC reliable?
The price and inventory of AT27LV256A-15JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27LV256A-15JC is usually 5 days.
3.What payment methods are accepted for AT27LV256A-15JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27LV256A-15JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27LV256A-15JC?
AT27LV256A-15JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27LV256A-15JC 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-15JC?
For technical support, including AT27LV256A-15JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27LV256A-15JC requirements.
6.How does Aetrix verify that AT27LV256A-15JC is sourced from the original manufacturer or authorized distributors?
All AT27LV256A-15JC 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-15JC meets industry standards.
7.What is the process for return or replacement of AT27LV256A-15JC?
All AT27LV256A-15JC units undergo pre-shipment inspection (PSI). If there is an issue with AT27LV256A-15JC, 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-15JC part is unused and in its original packaging.
Return procedure for AT27LV256A-15JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT27LV256A-15JC Tags
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