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Microchip Technology AT27LV256A-90JC
- Part No.:
- AT27LV256A-90JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT27LV256A-90JC.pdf
- Description:
- IC EPROM 256KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,154
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Product details
Overview
AT27LV256A-90JC from Atmel is a 256K-bit (32K × 8) one-time programmable EPROM optimized for low-voltage battery-powered systems, featuring 90 ns read access time at 3.0–3.6 V, dual-voltage operation (3.0–3.6 V or 4.5–5.5 V), and JEDEC-standard PLCC-32 packaging. It delivers 8 mA active current at 5 MHz and <20 µA max standby current, supporting TTL/CMOS-compatible I/O and rapid 100 µs/byte programming.
For engineers reviewing the AT27LV256A-90JC datasheet, AT27LV256A-90JC pinout, AT27LV256A-90JC application, or AT27LV256A-90JC equivalent, key selection criteria include its 90 ns speed grade, 32-pin PLCC package with NC pins at positions 1 and 17, dual-supply compatibility, integrated product identification code, and pin-for-pin equivalence to AT27C256R in read mode.
Technical Context
The AT27LV256A-90JC implements a two-line control architecture using CE and OE for bus contention management, with address decoding across A0–A14 and 8-bit parallel data output via O0–O7. Its internal logic supports both CMOS and TTL input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V) and guarantees VOH ≥ 2.4 V at IOH = −2.0 mA under 3.3 V supply.
Programming requires VCC = 6.5 V and VPP = 13.0 V with Rapid™ algorithm timing (tPW = 95–105 µs), while read operation is fully specified across commercial temperature range (0°C to 70°C) and supports product identification via A9 = 12.0 V and A0 toggling to select manufacturer/device bytes (0x1E/0x8C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32K × 8) OTP EPROM - fixed content storage without reprogrammability after initial programming. |
| Read Access Time | 90 ns max at VCC = 3.0–3.6 V - defines minimum clock cycle for reliable byte fetch in microcontroller boot ROM or firmware storage. |
| Supply Voltage Range | 3.0–3.6 V or 4.5–5.5 V - enables interoperability with both 3.3 V logic and legacy 5 V systems without level shifters. |
| Standby Current | 20 µA max at VCC = 3.6 V - ensures ultra-low power retention in portable or always-on embedded devices. |
| Operating Temperature | 0°C to 70°C - validated for commercial-grade applications including industrial HMI, instrumentation, and peripheral controllers. |
| Package Type | 32-lead PLCC (JEDEC MS-016 AE) - surface-mount compatible with standard reflow profiles and socketed prototyping. |
| Input/Output Compatibility | JEDEC LVTTL-compliant - drives standard TTL loads directly and accepts CMOS/TTL logic levels without interface circuitry. |
Pinout & Package
AT27LV256A-90JC uses a 32-lead Plastic Leaded Chip Carrier (PLCC) per JEDEC MS-016 AE, with pin 1 and pin 17 designated as no-connect (NC). The package is lead-free compatible and rated for reflow soldering per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus accepting 0–32767 to select one of 32K memory locations. |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus in read mode; high-impedance when OE or CE inactive. |
| CE | Chip Enable | Active-low global enable controlling device activation and standby entry (VIH ≥ 2.0 V disables). |
| OE | Output Enable | Active-low output gate enabling data bus drive only when CE is also asserted. |
| VCC | Power Supply | Primary supply pin supporting dual ranges: 3.0–3.6 V or 4.5–5.5 V for read/standby modes. |
| VPP | Programming Voltage | 13.0 V input required only during programming; must be applied after and removed before VCC. |
| GND | Ground Reference | Signal and power return path; decoupling capacitor (0.1 µF ceramic) required adjacent to this pin. |
| NC (Pins 1, 17) | No Connect | Physically present but internally unconnected; must remain floating per datasheet. |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time - reduces production burn-in duration and increases throughput in firmware programming stations. |
| Integrated Product ID Code | Manufacturer ID 0x1E and Device ID 0x8C - enables automatic algorithm selection in industry-standard programmers without manual configuration. |
| Dual-Voltage Read Operation | Valid operation at 3.0–3.6 V or 4.5–5.5 V - eliminates need for separate 3.3 V and 5 V EPROM SKUs in mixed-supply systems. |
| JEDEC Pin Compatibility | Pin-for-pin match with AT27C256R in read mode - allows drop-in replacement in existing 5 V designs with no PCB changes. |
| ESD & Latchup Robustness | 2000 V HBM ESD rating and 200 mA latchup immunity - enhances field reliability in handling-sensitive industrial environments. |
Applications
| Embedded Boot ROM | Firmware Storage |
|---|---|
Use Scenario: Storing immutable boot code for microcontrollers in medical diagnostic instruments requiring certified firmware integrity. IC Role / Device Role / Timing Role: Nonvolatile boot loader memory mapped to CPU reset vector, accessed within first 90 ns of power-on reset. Use Value: Guarantees deterministic startup timing and eliminates external level-shifting due to native 3.3 V/5 V dual-supply support. |
Use Scenario: Holding calibration constants and device-specific configuration data in factory-programmed test equipment. IC Role / Device Role / Timing Role: Static configuration store accessed during initialization sequence; no write cycles post-deployment. Use Value: Enables one-time factory programming with Rapid™ algorithm, reducing test floor cycle time by >40% vs. legacy EPROMs. |
| Legacy System Upgrade | Industrial Control Module |
Use Scenario: Replacing obsolete 5 V EPROMs in installed base telecom line cards operating on 5 V rails. IC Role / Device Role / Timing Role: Direct pin-compatible substitute for AT27C256R, maintaining identical timing and signal loading. Use Value: Eliminates redesign effort and qualification delays while delivering 80% lower active power consumption at same clock rate. |
Use Scenario: Providing firmware storage in DIN-rail mounted PLC I/O modules exposed to wide ambient temperatures. IC Role / Device Role / Timing Role: Industrial-temperature-rated (−40°C to +85°C) nonvolatile memory for ladder logic execution engine. Use Value: Ensures reliable read operation across full temperature range with <20 µA standby draw, extending backup battery life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C256R-90JC | 5 V-only operation (4.5–5.5 V); no low-voltage mode; identical 90 ns speed and PLCC-32 package. | Requires dedicated 5 V rail; unsuitable for battery-powered or mixed-voltage systems. | Select when legacy 5 V design forbids voltage scaling and VPP = 12.5 V programming is already established. |
| MX27C256AP-90 | Same 256K × 8 OTP architecture; 90 ns speed; 28-pin SOIC package (not PLCC); VCC = 4.5–5.5 V only. | Smaller footprint but incompatible pinout; lacks dual-voltage capability and product ID code. | Choose for space-constrained boards where PLCC socketing is unnecessary and 5 V supply is guaranteed. |
Compared with AT27C256R-90JC and MX27C256AP-90, the AT27LV256A-90JC uniquely supports 3.3 V operation with identical timing, enabling direct integration into modern low-power systems while retaining full backward compatibility with 5 V infrastructure.
Availability
AT27LV256A-90JC is available at Aetrix Electronics and suitable for embedded boot ROM, firmware storage, legacy system upgrade, and industrial control module applications requiring stable component supply, long-term lifecycle assurance, and JEDEC-standard PLCC packaging.
Supply support for AT27LV256A-90JC 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 innovator specializing in microcontrollers, nonvolatile memory, and secure authentication ICs.
The AT27LV256A belongs to Atmel's low-voltage OTP EPROM product line, engineered for energy-efficient firmware storage in portable, battery-operated, and dual-supply embedded systems where reliability and pin compatibility are critical.
FAQ
What is the maximum read access time specification for AT27LV256A-90JC?
The AT27LV256A-90JC has a maximum read access time of 90 ns when operated at VCC = 3.0–3.6 V or 4.5–5.5 V, measured from address valid or CE/OE assertion to valid data on O0–O7. This value is guaranteed across the commercial temperature range (0°C to 70°C) and defines the fastest supported system clock frequency for reliable memory reads. The "-90" suffix in AT27LV256A-90JC explicitly denotes this 90 ns speed grade.
Can AT27LV256A-90JC operate with a 3.3 V supply in a system using 5 V logic levels?
Yes, AT27LV256A-90JC supports TTL-compatible outputs at VCC = 3.0–3.6 V, producing VOH ≥ 2.4 V at IOH = −2.0 mA - sufficient to drive standard 5 V TTL inputs. Its VIH threshold (≥2.0 V) and VIL threshold (≤0.8 V) are compatible with both 3.3 V and 5 V logic families, eliminating level shifters in mixed-voltage designs. This dual-voltage interoperability is a core feature confirmed in the AT27LV256A-90JC datasheet.
Is AT27LV256A-90JC pin-compatible with AT27C256R-90JC?
Yes, AT27LV256A-90JC is pin-compatible with AT27C256R-90JC in read mode, sharing identical PLCC-32 pinout, address/data bus mapping, and CE/OE control signaling. However, AT27LV256A-90JC requires VPP = 13.0 V for programming versus 12.5 V for AT27C256R-90JC, and its standby current is significantly lower. The AT27LV256A-90JC datasheet explicitly states JEDEC pin compatibility with AT27C256R.
What programming voltage and conditions are required for AT27LV256A-90JC?
AT27LV256A-90JC requires VCC = 6.5 ± 0.25 V and VPP = 13.0 ± 0.25 V during programming, with VCC applied simultaneously with or before VPP and removed simultaneously with or after VPP. Programming uses the Rapid™ algorithm with 95–105 µs CE pulses and verification loops. A 0.1 µF capacitor between VPP and GND is mandatory to suppress transients. These parameters are strictly defined in the AT27LV256A-90JC AC/DC programming characteristics tables.
Does AT27LV256A-90JC support product identification for automated programming equipment?
Yes, AT27LV256A-90JC incorporates an integrated product identification code accessible via A9 = 12.0 V and toggling A0 to select either Manufacturer ID (0x1E) or Device ID (0x8C). This feature is electrically identical to the AT27C256R and is used by industry-standard programmers to auto-detect device type and apply correct algorithms - a verified capability documented in the AT27LV256A-90JC datasheet section "Atmel's 27LV256A Integrated Product Identification Code".
AT27LV256A-90JC 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:
- 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:
- 32-PLCC (13.97x11.43)
AT27LV256A-90JC FAQ
1.How can I place an order for AT27LV256A-90JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27LV256A-90JC 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-90JC reliable?
The price and inventory of AT27LV256A-90JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27LV256A-90JC is usually 5 days.
3.What payment methods are accepted for AT27LV256A-90JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27LV256A-90JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27LV256A-90JC?
AT27LV256A-90JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27LV256A-90JC 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-90JC?
For technical support, including AT27LV256A-90JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27LV256A-90JC requirements.
6.How does Aetrix verify that AT27LV256A-90JC is sourced from the original manufacturer or authorized distributors?
All AT27LV256A-90JC 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-90JC meets industry standards.
7.What is the process for return or replacement of AT27LV256A-90JC?
All AT27LV256A-90JC units undergo pre-shipment inspection (PSI). If there is an issue with AT27LV256A-90JC, 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-90JC part is unused and in its original packaging.
Return procedure for AT27LV256A-90JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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