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Microchip Technology AT27LV040A-90JU-T
- Part No.:
- AT27LV040A-90JU-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT27LV040A-90JU-T.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:750
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Product details
Overview
AT27LV040A-90JU-T from Atmel is a 4-Mbit (512K × 8) one-time programmable EPROM with 90 ns read access time, dual-voltage operation (3.0–3.6 V or 4.5–5.5 V), and industrial temperature range (−40°C to +85°C). It delivers TTL-compatible outputs at 3.0 V, supports rapid programming at 100 µs/byte, and features JEDEC-standard 32-lead PLCC packaging for embedded firmware storage in portable and mixed-supply systems.
For engineers reviewing the AT27LV040A-90JU-T datasheet, AT27LV040A-90JU-T pinout, AT27LV040A-90JU-T application, or AT27LV040A-90JU-T equivalent, this device serves as a low-power, voltage-flexible OTP replacement for legacy 5 V EPROMs while maintaining full programming compatibility with AT27C040 and supporting battery-powered, space-constrained, and dual-rail host environments.
Technical Context
The AT27LV040A-90JU-T implements a CMOS-based OTP EPROM architecture with two-line control (CE/OE), enabling bus contention avoidance in multi-device memory subsystems. Its dual-voltage design allows seamless integration into both 3.3 V and 5 V systems without level-shifting, and its TTL-compatible I/O ensures interoperability with legacy logic families.
It uses a rapid programming algorithm requiring VCC = 6.5 V and VPP = 13.0 V, with built-in product identification code (0x1E/0x0B) for automated programmer recognition. The device incorporates 2,000 V ESD protection and 200 mA latchup immunity, meeting industrial reliability requirements without external hardening.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4,194,304 bits (512K × 8) - supports full firmware images for 8-bit microcontrollers and boot loaders. |
| Read access time | 90 ns max at VCC = 3.0–3.6 V - enables real-time execution from ROM in high-speed embedded systems. |
| Supply voltage range | 3.0–3.6 V or 4.5–5.5 V - eliminates need for separate voltage regulators in mixed-supply card designs. |
| Standby current | 20 µA max (CMOS mode), <1 µA typical at 3.3 V - extends battery life in portable instrumentation and handheld devices. |
| Active power dissipation | 36 mW max at 5 MHz and VCC = 3.6 V - reduces thermal load vs. standard 5 V EPROMs by >50%. |
| Programming speed | 100 µs/byte typical - cuts firmware update time during manufacturing and field reprogramming. |
| Operating temperature | −40°C to +85°C - qualified for industrial control panels, automotive body modules, and outdoor telemetry units. |
Pinout & Package
AT27LV040A-90JU-T is housed in a JEDEC-standard 32-lead plastic J-leaded chip carrier (PLCC), designated 32J per Atmel ordering documentation. Package dimensions conform to MS-016 variation AE, with lead coplanarity ≤ 0.10 mm and matte tin lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address inputs | 19-bit address bus supporting full 512K-word addressing; A0 is LSB, A18 is MSB. |
| O0–O7 | Data outputs | 8-bit bidirectional data bus; outputs drive TTL-compatible levels even at VCC = 3.0 V. |
| CE | Chip enable | Active-low global enable; controls device selection and entry to standby mode when high. |
| OE | Output enable | Active-low output gate; allows multiple devices on shared data bus without contention. |
| VCC | Power supply | Primary supply input for logic and I/O; accepts either 3.0–3.6 V or 4.5–5.5 V. |
| VPP | Programming voltage | 13.0 V ± 0.25 V input required only during programming; must be applied simultaneously with VCC. |
| GND | Ground reference | Common return path for VCC and VPP; requires local 0.1 µF ceramic decoupling per device. |
Key Features
| Feature | Design Value |
|---|---|
| Rapid programming algorithm | 100 µs/byte typical programming time with auto-verify loop - reduces production line cycle time and improves yield. |
| Integrated product ID code | Manufacturer ID 0x1E and device ID 0x0B - enables automatic algorithm selection in industry-standard programmers. |
| Dual-voltage read compatibility | Operates correctly at 3.0–3.6 V or 4.5–5.5 V without configuration - simplifies board design for pluggable cards used in both 3 V and 5 V hosts. |
| TTL-level outputs at 3.0 V | VOH ≥ 2.4 V and VOL ≤ 0.4 V at IOL = 2.0 mA - eliminates level shifters when interfacing with 5 V microcontrollers or FPGAs. |
| High-reliability process | 2,000 V HBM ESD rating and 200 mA latchup immunity - meets industrial system robustness requirements without external protection. |
Applications
| Industrial PLC Firmware Storage | Legacy System Memory Upgrade |
|---|---|
Use Scenario: Storing fixed ladder logic and I/O mapping tables in programmable logic controllers deployed in factory automation cabinets. IC Role / Device Role / Timing Role: Nonvolatile firmware storage with deterministic 90 ns read latency to support real-time scan cycles. Use Value: Dual-voltage support allows reuse of existing 5 V backplanes while enabling lower-power operation during idle periods via 3.3 V mode. | Use Scenario: Replacing obsolete 5 V EPROMs (e.g., AT27C040) in aging medical diagnostic equipment without PCB redesign. IC Role / Device Role / Timing Role: Pin- and function-compatible OTP memory drop-in replacement with identical programming interface and timing. Use Value: Maintains full system functionality while reducing standby current by >95% and eliminating need for 5 V regulator in new revisions. |
| Portable Test Equipment Boot ROM | Automotive Body Control Module |
Use Scenario: Holding boot code and calibration constants in handheld oscilloscopes and multimeters powered by Li-ion batteries. IC Role / Device Role / Timing Role: Low-power OTP memory enabling fast wake-from-standby execution with <1 µA quiescent draw. Use Value: Extends battery runtime by minimizing active and standby power consumption versus standard 5 V EPROM alternatives. | Use Scenario: Storing window lift algorithms and door lock state machines in non-safety-critical automotive ECUs. IC Role / Device Role / Timing Role: Industrial-grade OTP memory qualified for −40°C to +85°C ambient operation in under-hood and cabin locations. Use Value: Eliminates EEPROM wear-out concerns and provides guaranteed data retention over 10+ years without refresh cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C040-90JU | 5 V only operation (4.5–5.5 V); no 3.3 V support; identical 90 ns access, same PLCC-32 package and pinout. | Requires dedicated 5 V rail; unsuitable for battery-powered or mixed-voltage systems. | Select when legacy 5 V infrastructure is fixed and power efficiency is secondary. |
| MX29LV400CBTI-90G | Flash-based (reprogrammable), 3.3 V only, 4 Mbit (512K × 8), 90 ns access, TSOP-48 package - not pin-compatible. | Supports in-system reprogramming but requires different PCB layout and voltage sequencing. | Select when field firmware updates are required and board redesign is acceptable. |
Compared with AT27C040-90JU, the AT27LV040A-90JU-T adds 3.3 V operation and cuts standby current by >95%; compared with MX29LV400CBTI-90G, it offers true OTP security and PLCC-32 compatibility but lacks reprogrammability - ideal for cost-sensitive, tamper-resistant, or footprint-constrained deployments.
Availability
AT27LV040A-90JU-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy system memory upgrades, and portable test equipment boot ROM requiring stable component supply, long-term lifecycle assurance, and green (Pb/halide-free) packaging compliance.
Supply support for AT27LV040A-90JU-T 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 manufacturer specializing in microcontrollers, nonvolatile memory, and secure authentication ICs for industrial, automotive, and consumer applications.
The AT27LV040A belongs to Atmel's low-voltage OTP EPROM product line, designed specifically for energy-efficient, mixed-supply embedded systems where firmware integrity, long-term data retention, and backward compatibility with legacy 5 V designs are critical.
FAQ
What voltage ranges does the AT27LV040A-90JU-T support during normal read operation?
The AT27LV040A-90JU-T supports two independent read voltage ranges: 3.0 V to 3.6 V (low-voltage mode) and 4.5 V to 5.5 V (standard 5 V mode). Both ranges are fully specified in the datasheet for AC and DC parameters, including 90 ns access time and TTL-compatible outputs. VCC must remain within the selected range throughout read operation; switching between ranges requires power cycling or controlled sequencing.
Is the AT27LV040A-90JU-T pin-compatible with the AT27C040-90JU?
Yes, the AT27LV040A-90JU-T is pin-compatible and functionally compatible with the AT27C040-90JU, sharing identical 32-lead PLCC (32J) packaging, pinout, address/data/control signal assignments, and programming interface. The AT27LV040A-90JU-T extends compatibility by adding 3.3 V operation while retaining full programming equivalence using the same equipment and algorithms.
What is the purpose of the VPP pin on the AT27LV040A-90JU-T, and when is it used?
The VPP pin on the AT27LV040A-90JU-T supplies 13.0 V ± 0.25 V exclusively during programming and verification cycles. It is not used during normal read or standby operation. VPP must be applied simultaneously with VCC (6.5 V) and removed together; connecting VPP directly to VCC is permitted only outside programming phases. A 0.1 µF capacitor between VPP and GND is mandatory to suppress transients during programming pulses.
Does the AT27LV040A-90JU-T require external decoupling capacitors, and if so, what values?
Yes, the AT27LV040A-90JU-T requires two decoupling capacitors: a 0.1 µF high-frequency ceramic capacitor placed as close as possible between VCC and GND per device, and a 4.7 µF bulk electrolytic capacitor near the power entry point for arrays of multiple devices. These are mandated to suppress transient voltage excursions during CE transitions and stabilize supply rails under dynamic load conditions, preventing nonconformance per datasheet system considerations.
How does the integrated product identification code work on the AT27LV040A-90JU-T?
The AT27LV040A-90JU-T includes a two-byte electronic ID: manufacturer code 0x1E and device code 0x0B. It is accessed by holding all address lines low except A9 (set to 12.0 V) and toggling A0 - low for manufacturer ID, high for device ID. This feature enables automatic recognition by industry-standard programmers, ensuring correct algorithm and voltage selection without manual configuration, and matches the ID of the AT27C040 for seamless tool compatibility.
AT27LV040A-90JU-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EPROM
- Technology:
- EPROM - OTP
- Memory Size:
- 4Mbit
- Memory Organization:
- 512K 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)
AT27LV040A-90JU-T FAQ
1.How can I place an order for AT27LV040A-90JU-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27LV040A-90JU-T 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 AT27LV040A-90JU-T reliable?
The price and inventory of AT27LV040A-90JU-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27LV040A-90JU-T is usually 5 days.
3.What payment methods are accepted for AT27LV040A-90JU-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27LV040A-90JU-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27LV040A-90JU-T?
AT27LV040A-90JU-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27LV040A-90JU-T 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 AT27LV040A-90JU-T?
For technical support, including AT27LV040A-90JU-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27LV040A-90JU-T requirements.
6.How does Aetrix verify that AT27LV040A-90JU-T is sourced from the original manufacturer or authorized distributors?
All AT27LV040A-90JU-T 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 AT27LV040A-90JU-T meets industry standards.
7.What is the process for return or replacement of AT27LV040A-90JU-T?
All AT27LV040A-90JU-T units undergo pre-shipment inspection (PSI). If there is an issue with AT27LV040A-90JU-T, 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 AT27LV040A-90JU-T part is unused and in its original packaging.
Return procedure for AT27LV040A-90JU-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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