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Microchip Technology AT27LV040A-90VI
- Part No.:
- AT27LV040A-90VI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
AT27LV040A-90VI.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 32VSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,357
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Product details
Overview
AT27LV040A-90VI 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 features CMOS/TTL-compatible I/O, 20 µA max standby current at 3.6 V, and JEDEC-standard 32-lead VSOP packaging - ideal for battery-powered portable instrumentation and legacy embedded control systems requiring nonvolatile program storage.
For engineers reviewing the AT27LV040A-90VI datasheet, AT27LV040A-90VI pinout, AT27LV040A-90VI application, or AT27LV040A-90VI equivalent, key selection criteria include verified 90 ns access timing under 3.3 V supply, industrial-grade reliability (200 mA latchup immunity, 2 kV ESD), OTP programming compatibility with AT27C040, and VSOP package footprint constraints in space-constrained PCB layouts.
Technical Context
The AT27LV040A-90VI implements a single-supply OTP EPROM architecture with two-line control (CE/OE), enabling bus contention avoidance in shared-memory systems. Its address decoding supports 19-bit addressing (A0–A18) for full 512K-word access, and output drivers meet LVTTL voltage thresholds (VOH ≥ 2.4 V at IOH = −2.0 mA, VOL ≤ 0.4 V at IOL = 2.0 mA) across both 3.3 V and 5 V supply modes.
Programming uses Rapid™ algorithm with 100 µs/byte typical pulse width at VCC = 6.5 V and VPP = 13.0 V, while product identification is accessed via A9 = 12.0 V and A0 toggling to select manufacturer (0x1E) or device code (0x0B) bytes - ensuring compatibility with industry-standard programmers calibrated for AT27C040.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4,194,304 bits (512K × 8) - supports full firmware image storage for 8-bit microcontrollers without external memory expansion. |
| Read Access Time | 90 ns max at VCC = 3.0–3.6 V - enables direct interface with 10 MHz Z80 or 8051 derivatives without wait states. |
| Supply Voltage Range | 3.0–3.6 V or 4.5–5.5 V - allows seamless integration into mixed-voltage systems (e.g., 3.3 V logic with 5 V peripherals). |
| Standby Current | 20 µA max at VCC = 3.6 V - extends battery life in portable diagnostic tools and handheld test equipment. |
| Operating Temperature | −40°C to +85°C - qualified for industrial automation controllers and automotive body electronics modules. |
| Package | 32-lead VSOP (8 × 14 mm) - provides compact surface-mount footprint compatible with JEDEC MO-142 BA standard. |
| ESD/Latchup | 2,000 V HBM ESD protection; 200 mA latchup immunity - ensures robustness in manufacturing and field deployment environments. |
Pinout & Package
AT27LV040A-90VI is supplied in a 32-lead Very Small Outline Package (VSOP), JEDEC MO-142 BA compliant, with 0.5 mm lead pitch and 8 mm × 14 mm body size. Pin 1 is marked by index notch; leads are gull-wing shaped for reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus interface; all must be stable before CE low to guarantee correct byte access within 90 ns. |
| O0–O7 | Data Outputs | True TTL/CMOS-compatible bidirectional data bus outputs; high-impedance when OE or CE high. |
| CE | Chip Enable | Active-low chip select; controls device activation and power state transition between active (≤10 mA) and standby (≤20 µA). |
| OE | Output Enable | Active-low output gate; decouples data bus during read cycles without affecting internal address latching. |
| VCC | Power Supply | Primary supply input (3.0–3.6 V or 4.5–5.5 V); requires local 0.1 µF ceramic bypass capacitor per device. |
| VPP | Programming Voltage | 13.0 V programming supply input; must be applied simultaneously with or after VCC and removed simultaneously or before VCC. |
| GND | Ground Reference | Signal and power ground return; requires low-inductance connection to minimize noise coupling during rapid programming pulses. |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time - reduces firmware update cycle time by >5× versus legacy EPROMs, improving production throughput. |
| Integrated Product ID Code | Manufacturer ID 0x1E and Device ID 0x0B accessible via A9 = 12.0 V and A0 toggle - enables automatic algorithm selection in universal programmers. |
| Dual-Voltage Read Compatibility | TTL-level outputs at VCC = 3.0 V - eliminates level-shifting requirements when interfacing with 5 V microcontrollers or FPGAs. |
| JEDEC Standard Packages | VSOP (32V), TSOP (32T), PLCC (32J) - allows drop-in replacement across form factors without redesigning PCB layout or socket tooling. |
| Low-Power Standby Mode | ≤1 µA typical ICC at 3.3 V - enables always-on memory retention in energy-harvesting sensor nodes and backup configuration storage. |
Applications
| Industrial PLC Firmware Storage | Medical Diagnostic Equipment Boot ROM |
|---|---|
|
Use Scenario: Storing fixed firmware and calibration tables in programmable logic controller modules deployed in factory-floor environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Nonvolatile program memory providing deterministic 90 ns instruction fetch latency to ensure real-time scan-cycle execution. Use Value: Industrial temperature rating (−40°C to +85°C) and 200 mA latchup immunity prevent runtime corruption during electrical transients on noisy plant-floor power rails. |
Use Scenario: Holding boot code and safety-critical initialization routines in portable ultrasound and ECG devices powered by rechargeable Li-ion batteries. IC Role / Device Role / Timing Role: Low-voltage OTP EPROM delivering reliable startup sequence execution without external voltage translation. Use Value: 20 µA max standby current at 3.3 V extends battery runtime between charges, while 3.0–3.6 V operation matches battery discharge profile. |
| Legacy Automotive Body Control Module | Avionics Test Set Configuration Memory |
|
Use Scenario: Storing vehicle-specific configuration maps and CAN protocol stack parameters in dashboard control units retrofitted into older vehicle platforms. IC Role / Device Role / Timing Role: Pin-compatible replacement for AT27C040 in existing 5 V designs, supporting dual-supply migration paths. Use Value: JEDEC-standard 32-lead VSOP footprint allows direct PCB reuse; 5 V ±10% operation maintains compatibility with legacy 5 V power domains. |
Use Scenario: Retaining instrument-specific calibration coefficients and self-test sequences in portable avionics ground support equipment used across multiple aircraft models. IC Role / Device Role / Timing Role: Secure, one-time programmable memory preventing unauthorized firmware modification during field maintenance. Use Value: Integrated product ID code (0x1E/0x0B) enables automated verification of correct device installation prior to calibration upload. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C040-90JC | 5 V-only operation (4.5–5.5 V); no 3.3 V support; same 90 ns access, PLCC package. | Requires dedicated 5 V rail; unsuitable for battery-powered or mixed-voltage systems. | Select when legacy 5 V design prohibits voltage scaling and PLCC socket compatibility is mandatory. |
| MX29LV400CBTI-90G | Flash-based (reprogrammable), 3.3 V only, 48-pin TSOP; lacks VPP pin and OTP security model. | Enables field firmware updates but introduces erase-cycle wear-out and higher standby current (100 µA). | Select when firmware revision flexibility outweighs need for permanent, tamper-resistant storage and VSOP footprint. |
Compared with AT27C040-90JC, AT27LV040A-90VI adds dual-voltage operation and VSOP packaging but retains identical programming algorithms and ID codes; versus MX29LV400CBTI-90G, it trades reprogrammability for lower power, smaller footprint, and inherent write-protection - critical for safety-certified systems.
Availability
AT27LV040A-90VI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical diagnostic equipment boot ROM, and legacy automotive body control module applications requiring stable component supply across extended lifecycle demands.
Supply support for AT27LV040A-90VI 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, designed high-reliability nonvolatile memory and microcontroller solutions for industrial, automotive, and communications markets.
The AT27LV040A product line delivers low-voltage, one-time programmable EPROMs optimized for cost-sensitive, space-constrained embedded systems needing guaranteed firmware integrity and long-term data retention without refresh.
FAQ
What is the maximum operating frequency supported by the AT27LV040A-90VI during read operations?
The AT27LV040A-90VI does not specify a maximum clock frequency; instead, its performance is defined by access timing. With a 90 ns address-to-output delay (tACC) at VCC = 3.0–3.6 V, it supports reliable read cycles up to approximately 11 MHz in systems where address setup/hold and output enable timing are properly managed. The AT27LV040A-90VI achieves this while maintaining <1 µA typical standby current - a key advantage over faster but higher-power alternatives.
Can the AT27LV040A-90VI be programmed using standard AT27C040 programming equipment?
Yes, the AT27LV040A-90VI is fully programming-compatible with AT27C040 equipment due to identical Rapid™ algorithm implementation, matching 100 µs/byte pulse width, and shared product identification code (0x1E/0x0B). The AT27LV040A-90VI requires VCC = 6.5 V and VPP = 13.0 V during programming - voltages that standard AT27C040 programmers deliver - and uses the same CE-controlled pulse sequencing.
What package type does the AT27LV040A-90VI use, and is it RoHS-compliant?
The AT27LV040A-90VI uses a 32-lead VSOP (Very Small Outline Package) per JEDEC MO-142 BA, measuring 8 mm × 14 mm with 0.5 mm lead pitch. While the original 1998 datasheet predates RoHS, Microchip's current product change notifications confirm legacy Atmel OTP EPROMs including AT27LV040A-90VI are manufactured in RoHS-compliant facilities with lead-free terminations - verified by Aetrix Electronics' traceable lot documentation.
Does the AT27LV040A-90VI support partial reprogramming or sector erasure?
No, the AT27LV040A-90VI is a one-time programmable (OTP) EPROM - once programmed, its contents cannot be altered, erased, or rewritten. It lacks flash-style sector erase or byte-programming capability. This design ensures absolute firmware immutability, making the AT27LV040A-90VI suitable for safety-critical applications where accidental or malicious code modification must be physically impossible.
How does the AT27LV040A-90VI handle power supply decoupling, and what capacitors are required?
The AT27LV040A-90VI requires a 0.1 µF high-frequency ceramic capacitor placed between VCC and GND, mounted as close as possible to the device pins, to suppress transient voltage excursions during CE transitions. For multi-device EPROM arrays, a 4.7 µF bulk electrolytic capacitor must also be added near the power entry point - both are mandatory per Atmel's system considerations to prevent non-conformance caused by supply rail instability during rapid programming or read cycles.
AT27LV040A-90VI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-TFSOP (0.488", 12.40mm Width)
- Packaging:
- Tray
- Product Status:
- Obsolete
- 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-VSOP
AT27LV040A-90VI FAQ
1.How can I place an order for AT27LV040A-90VI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27LV040A-90VI 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-90VI reliable?
The price and inventory of AT27LV040A-90VI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27LV040A-90VI is usually 5 days.
3.What payment methods are accepted for AT27LV040A-90VI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27LV040A-90VI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27LV040A-90VI?
AT27LV040A-90VI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27LV040A-90VI 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-90VI?
For technical support, including AT27LV040A-90VI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27LV040A-90VI requirements.
6.How does Aetrix verify that AT27LV040A-90VI is sourced from the original manufacturer or authorized distributors?
All AT27LV040A-90VI 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-90VI meets industry standards.
7.What is the process for return or replacement of AT27LV040A-90VI?
All AT27LV040A-90VI units undergo pre-shipment inspection (PSI). If there is an issue with AT27LV040A-90VI, 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-90VI part is unused and in its original packaging.
Return procedure for AT27LV040A-90VI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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