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Microchip Technology AT27LV512A-90JU
- Part No.:
- AT27LV512A-90JU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT27LV512A-90JU.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:367
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Product details
Overview
AT27LV512A-90JU from Microchip Technology (formerly Atmel) is a 64K × 8-bit, one-time programmable EPROM with 90ns read access time, dual-voltage operation (3.0–3.6V or 4.5–5.5V), and industrial temperature range (−40°C to +85°C). It delivers TTL-compatible outputs at 3.0V supply and supports rapid programming at 100µs/byte - ideal for battery-powered portable systems requiring low-power nonvolatile code storage.
For engineers reviewing the AT27LV512A-90JU datasheet, AT27LV512A-90JU pinout, AT27LV512A-90JU application, or AT27LV512A-90JU equivalent, key selection criteria include its JEDEC-standard 32-lead PLCC package, CMOS/TTL I/O compatibility, sub-1µA typical standby current at 3.3V, and direct programming equivalence with AT27C512R using standard 5V programmers.
Technical Context
The AT27LV512A-90JU implements a single-supply OTP EPROM architecture with two-line control (CE and OE/VPP), enabling bus contention prevention in multi-device systems. Its dual-voltage design allows seamless integration into both 3.3V and 5V host environments without level-shifting circuitry.
It uses high-reliability CMOS technology with 2,000V ESD protection and 200mA latchup immunity. Programming requires VCC = 6.5V and OE/VPP = 13.0V, while product identification is accessed via A9 = 12.0V and A0 toggling - supporting automated programming equipment recognition.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 524,288 bits (64K × 8), sufficient for firmware boot code or configuration tables in embedded controllers |
| Read access time | 90 ns max at VCC = 3.0–3.6V, enabling real-time execution in 11 MHz CPU systems |
| Supply voltage range | 3.0–3.6V or 4.5–5.5V - supports mixed-voltage board designs and legacy 5V system upgrades |
| Standby current | 20 µA max (CMOS mode), <1 µA typical at 3.3V - extends battery life in portable instrumentation |
| Active power dissipation | 29 mW max at 5 MHz and VCC = 3.6V - reduces thermal load vs. standard 5V EPROMs |
| Operating temperature | −40°C to +85°C industrial grade - qualified for use in factory automation and outdoor telecom equipment |
| ESD/latchup rating | 2,000V HBM ESD protection and 200mA latchup immunity - improves field reliability in unshielded environments |
Pinout & Package
AT27LV512A-90JU is housed in a JEDEC-standard 32-lead plastic J-leaded chip carrier (PLCC), designated 32J per Atmel's ordering information. The package features gull-wing leads, matte tin finish, and conforms to MS-016 variation AE.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address inputs | 16-bit address bus interface; supports full 64K memory map decoding |
| O0–O7 | Data outputs | 8-bit bidirectional data bus - outputs valid during read when CE and OE/VPP are low |
| CE | Chip enable | Active-low global device select; controls entry to standby mode when high |
| OE/VPP | Output enable / programming voltage | Low during read; driven to 13.0V during programming; enables output drivers only when CE is also low |
| VCC | Power supply | Accepts either 3.0–3.6V or 4.5–5.5V; must be applied before/with OE/VPP |
| GND | Ground reference | Common return path for all signals and power; decoupling capacitor required per datasheet |
| NC | No connect | Pins 1 and 17 are unconnected - no PCB trace or pad required |
Key Features
| Feature | Design Value |
|---|---|
| Rapid programming algorithm | 100 µs/byte typical - cuts firmware update time by >5× vs. conventional EPROMs |
| Integrated product ID code | Manufacturer byte 0x1E and device code 0x0D - enables automatic algorithm selection in universal programmers |
| Two-line control architecture | Separate CE and OE/VPP pins - eliminates bus contention and simplifies timing-critical read sequencing |
| TTL-level output compatibility at 3.0V | VOH ≥ 2.4V and VOL ≤ 0.4V driving 2.1mA - interfaces directly with 5V logic without translators |
| Green packaging | Pb/halide-free PLCC - meets RoHS Directive 2011/65/EU and JEDEC J-STD-609A Class 1 |
Applications
| Industrial PLC Firmware Storage | Medical Device Boot ROM |
|---|---|
Use Scenario: Storing immutable boot firmware and safety-critical calibration tables in programmable logic controllers deployed in factory environments. IC Role / Device Role / Timing Role: Nonvolatile code storage with guaranteed read integrity across −40°C to +85°C ambient and EMI-rich motor-control zones. Use Value: Sub-1µA standby current extends backup battery life beyond 10 years; 2,000V ESD rating prevents field failures during maintenance hot-swaps. | Use Scenario: Holding certified bootloader and diagnostic routines in Class II medical instruments requiring long-term data retention and regulatory traceability. IC Role / Device Role / Timing Role: One-time programmable ROM ensuring firmware immutability post-certification; green packaging satisfies IEC 60601-1 environmental compliance. Use Value: Rapid 100µs/byte programming accelerates production firmware loading; JEDEC-standard PLCC enables legacy rework compatibility. |
| Telecom Line Card Configuration | Avionics Test Equipment Memory |
Use Scenario: Storing hardware-specific configuration bitstreams and protocol stacks on modular telecom line cards operating in 3.3V and 5V backplanes. IC Role / Device Role / Timing Role: Dual-voltage OTP EPROM providing pin-compatible firmware storage across mixed-voltage chassis generations. Use Value: TTL-compatible outputs at 3.0V eliminate level shifters; 90ns access supports real-time packet header processing in 100 Mbps Ethernet interfaces. | Use Scenario: Retaining calibrated test vectors and self-test algorithms in portable avionics ground support equipment used across hangar and flight-line environments. IC Role / Device Role / Timing Role: Industrial-grade OTP memory with verified operation down to −40°C - critical for cold-soak testing of aircraft sensors. Use Value: 200mA latchup immunity withstands transient coupling from adjacent RF test sources; 32J PLCC footprint matches legacy MIL-STD-883 repair workflows. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C512R-90JU | 5V-only operation (4.5–5.5V); identical pinout, timing, and programming algorithm | Requires dedicated 5V rail; not suitable for battery-powered 3.3V systems | Select when board already uses 5V logic and no low-voltage operation is needed |
| MX29LV512CTI-90G | 3.3V-only flash memory; 100K write/erase cycles; software-controlled sector erase | Field-upgradable; requires different command sequences and voltage sequencing | Select when firmware updates in the field are required - not for one-time boot code |
Compared with AT27C512R-90JU, the AT27LV512A-90JU adds 3.3V operation and lower standby current but retains identical programming flow; compared with MX29LV512CTI-90G, it offers true OTP security and simpler interface but lacks reprogrammability.
Availability
AT27LV512A-90JU is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostics equipment, telecom line cards, and avionics test gear requiring stable component supply and long-lifecycle support.
Supply support for AT27LV512A-90JU 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
Microchip Technology acquired Atmel in 2016 and maintains full technical and manufacturing continuity for legacy Atmel EPROM products including the AT27LV512A series.
The AT27LV512A belongs to Atmel's industrial-grade OTP EPROM family, designed specifically for cost-sensitive, high-reliability embedded systems where firmware immutability, low power, and dual-voltage interoperability are mandatory.
FAQ
What is the maximum operating frequency supported by the AT27LV512A-90JU?
The AT27LV512A-90JU does not operate at a clock frequency itself - it is an asynchronous memory device. Its 90ns access time supports CPU bus frequencies up to approximately 11 MHz in simple wait-state-free configurations. For example, at 5 MHz bus activity, active power consumption remains within 8 mA (VCC = 3.3V), confirming reliable operation under sustained read loads. The AT27LV512A-90JU datasheet specifies timing parameters like tACC, tCE, and tOE rather than a clock rate.
Can the AT27LV512A-90JU be programmed using standard 5V EPROM programmers?
Yes - the AT27LV512A-90JU is fully programming-compatible with the AT27C512R and uses identical programming equipment. It requires VCC = 6.5V and OE/VPP = 13.0V during programming, but these voltages are generated internally by compliant programmers. The integrated product ID (0x1E/0x0D) ensures automatic algorithm selection. No hardware modification is needed to program the AT27LV512A-90JU on existing AT27C512R-capable programmers.
Does the AT27LV512A-90JU support partial reprogramming or sector erasure?
No - the AT27LV512A-90JU is a one-time programmable (OTP) EPROM. Once a byte is programmed, it cannot be altered or erased electrically. There is no UV window or flash-based erase mechanism. This design ensures absolute firmware integrity and prevents accidental or malicious corruption - a key requirement for safety-critical applications where the AT27LV512A-90JU is commonly deployed.
What decoupling capacitors are required for stable operation of the AT27LV512A-90JU?
Per the AT27LV512A-90JU datasheet, each device requires a 0.1 µF high-frequency ceramic capacitor placed between VCC and GND, mounted as close as possible to the PLCC pins. For boards with multiple EPROMs, a 4.7 µF bulk electrolytic capacitor must also be placed near the power entry point. These values prevent transient voltage excursions during CE transitions that could cause nonconformance - a documented system-level requirement for reliable AT27LV512A-90JU operation.
Is the AT27LV512A-90JU RoHS-compliant and halogen-free?
Yes - the AT27LV512A-90JU carries the "Green package (Pb/halide-free)" designation in Atmel's ordering information. It uses matte tin lead finish and complies with EU RoHS Directive 2011/65/EU and JEDEC J-STD-609A Class 1 for moisture sensitivity and halogen content. This makes the AT27LV512A-90JU suitable for environmentally regulated industrial and medical end equipment without requiring exemptions.
AT27LV512A-90JU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EPROM
- Technology:
- EPROM - OTP
- Memory Size:
- 512Kbit
- Memory Organization:
- 64K 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:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT27LV512A-90JU FAQ
1.How can I place an order for AT27LV512A-90JU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27LV512A-90JU 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 AT27LV512A-90JU reliable?
The price and inventory of AT27LV512A-90JU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27LV512A-90JU is usually 5 days.
3.What payment methods are accepted for AT27LV512A-90JU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27LV512A-90JU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27LV512A-90JU?
AT27LV512A-90JU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27LV512A-90JU 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 AT27LV512A-90JU?
For technical support, including AT27LV512A-90JU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27LV512A-90JU requirements.
6.How does Aetrix verify that AT27LV512A-90JU is sourced from the original manufacturer or authorized distributors?
All AT27LV512A-90JU 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 AT27LV512A-90JU meets industry standards.
7.What is the process for return or replacement of AT27LV512A-90JU?
All AT27LV512A-90JU units undergo pre-shipment inspection (PSI). If there is an issue with AT27LV512A-90JU, 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 AT27LV512A-90JU part is unused and in its original packaging.
Return procedure for AT27LV512A-90JU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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