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Microchip Technology AT27LV520-70XU
- Part No.:
- AT27LV520-70XU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT27LV520-70XU.pdf
- Description:
- IC EPROM 512KBIT PAR 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,476
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Product details
Overview
AT27LV520-70XU from Atmel is a 524,288-bit (64K × 8) one-time programmable EPROM with multiplexed address/data bus, 70 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 serves as nonvolatile program storage in embedded controllers and legacy microprocessor systems requiring low-power, battery-compatible memory.
For engineers reviewing the AT27LV520-70XU datasheet, AT27LV520-70XU pinout, AT27LV520-70XU application, or AT27LV520-70XU equivalent, key selection criteria include its 20-lead TSSOP package, 70 ns tACC timing at both voltage ranges, rapid 50 µs/byte programming, JEDEC-compliant LVTTL I/O, and pin compatibility with AT27C520 for drop-in replacement in 5 V designs.
Technical Context
The AT27LV520-70XU uses internal latches to multiplex AD0–AD7 for both lower-address and data functions, reducing system chip count and simplifying bus design. Its dual-supply architecture enables interoperability with both 3.3 V logic and legacy 5 V TTL systems without level shifters.
Standby mode is entered by asserting ALE high, achieving ≤20 µA ICC at 3.6 V; active power is 29 mW max at 5 MHz and 3.6 V. Programming employs a verified 50 µs ALE pulse width at VCC = 6.5 V and OE/VPP = 13.0 V, with built-in verification loop per byte.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 524,288 bits (64K × 8), one-time programmable OTP EPROM |
| Read Access Time (tACC) | 70 ns maximum at VCC = 3.0–3.6 V or 4.5–5.5 V - guarantees fast instruction fetch in microcontroller boot ROM |
| Supply Voltage Range | 3.0–3.6 V or 4.5–5.5 V - supports dual-voltage host systems and battery-powered portable designs |
| Standby Current (ISB) | 20 µA max at VCC = 3.6 V and ALE = VIH - enables ultra-low-power retention in sleep modes |
| Programming Speed | 50 µs/byte typical - reduces production programming time versus standard EPROMs |
| I/O Compatibility | CMOS- and TTL-compatible inputs/outputs per JEDEC LVTTL - ensures direct interface with 5 V microprocessors and 3.3 V FPGAs |
| Operating Temperature | −40°C to +85°C industrial range - validated for use in automotive control modules and industrial PLCs |
Pinout & Package
AT27LV520-70XU is packaged in a 20-lead TSSOP (JEDEC MO-153 AC), 4.4 mm body width, gull-wing lead profile. Pin 1 marked by index notch; leads spaced at 0.65 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A8–A15 | Upper Address Inputs | Non-multiplexed address lines for 64K addressing; driven directly by MPU address bus high byte |
| AD0–AD7 | Multiplexed Address/Data | Shared bus for lower address (latched on ALE high) and data (output during read); reduces PCB trace count |
| OE/VPP | Output Enable / Program Supply | Active-low read enable; during programming, accepts 13.0 V for VPP - requires dedicated programmer voltage rail |
| ALE | Address Latch Enable | High-level strobe to capture AD0–AD7 as A0–A7; controls internal latch timing for multiplexed bus operation |
| VCC | Power Supply | Accepts either 3.0–3.6 V or 4.5–5.5 V - no external regulator needed for mixed-voltage systems |
| GND | Ground Reference | Common return for all signals and supplies; decoupling capacitor required per datasheet (0.1 µF ceramic + 4.7 µF bulk) |
Key Features
| Feature | Design Value |
|---|---|
| Pin Compatibility | Direct drop-in replacement for AT27C520 - same pinout, timing, and programming algorithm enables legacy design reuse |
| Rapid Programming | 50 µs/byte typical with auto-verify loop - eliminates manual reprogramming and improves manufacturing throughput |
| Integrated ID Code | Manufacturer ID (0x1E) and Device Code (0x9D) readable via A9/A8 toggle - enables automated programmer identification and firmware validation |
| ESD/Latch-up Robustness | 2,000 V HBM ESD protection and 200 mA latch-up immunity - enhances field reliability in uncontrolled environments |
| Green Packaging | Pb/halide-free TSSOP (20X) - complies with RoHS Directive 2011/65/EU without performance trade-offs |
Applications
| Industrial Control Firmware Storage | Legacy Microprocessor Boot ROM |
|---|---|
Use Scenario: Storing fixed firmware for programmable logic controllers (PLCs) operating in factory-floor environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Nonvolatile boot code storage accessed at power-on reset; 70 ns tACC ensures minimal CPU wait states during initialization. Use Value: Industrial temperature rating and 2,000 V ESD tolerance prevent field failures in electrically noisy plant settings. |
Use Scenario: Providing BIOS or monitor code for Z80- or 8086-based embedded systems where space and BOM cost are constrained. IC Role / Device Role / Timing Role: Primary ROM mapped into upper memory space; multiplexed AD0–AD7 reduces address bus wiring complexity. Use Value: Pin compatibility with AT27C520 allows direct upgrade from 5 V to dual-voltage operation without PCB redesign. |
| Portable Instrumentation Memory | Card-Based Dual-Voltage Systems |
Use Scenario: Holding calibration tables and sensor algorithms in handheld test equipment powered by Li-ion batteries (3.3 V nominal). IC Role / Device Role / Timing Role: Low-voltage read-only memory with ≤20 µA standby current - extends battery life between charges. Use Value: 3.0–3.6 V operation eliminates need for 5 V boost converter, reducing size, cost, and thermal load. |
Use Scenario: Memory module for PCMCIA or ISA cards that must operate in both 3.3 V and 5 V host slots without jumpering or configuration. IC Role / Device Role / Timing Role: Voltage-flexible EPROM supporting seamless insertion into legacy and modern backplanes. Use Value: TTL-level outputs at 3.0 V ensure compatibility with 5 V peripherals, avoiding external level translators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C520-70PU | 5 V only (4.5–5.5 V), no 3.3 V support; same 70 ns tACC and 20-lead PDIP package | Limited to pure 5 V systems; lacks battery-friendly low-voltage operation | Select when upgrading existing 5 V designs with no voltage flexibility requirement |
| MX29LV512TCI-70G | 3 V Flash (not OTP), 512 Kbit, 70 ns, SOIC-32; supports erase/rewrite, higher endurance | Field-upgradable firmware vs. one-time programming; requires different command protocol and voltage sequencing | Select when firmware updates are needed post-deployment; not a pin-compatible substitute |
Compared with AT27LV520-70XU, AT27C520-70PU offers identical timing and pinout but sacrifices low-voltage capability, while MX29LV512TCI-70G provides reprogrammability at the cost of larger package, different interface, and no OTP security guarantee.
Availability
AT27LV520-70XU is available at Aetrix Electronics and suitable for industrial control firmware storage, legacy microprocessor boot ROM, and portable instrumentation memory requiring stable component supply across extended product lifecycles.
Supply support for AT27LV520-70XU 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.
The AT27LV520 belongs to Atmel's low-voltage OTP EPROM product line, designed specifically for embedded systems needing reliable, low-power, pin-compatible upgrades from standard 5 V EPROMs in industrial and portable applications.
FAQ
What is the primary function of the AT27LV520-70XU in a system?
The AT27LV520-70XU functions as a 64K × 8 one-time programmable EPROM used for storing immutable firmware, boot code, or lookup tables. Its multiplexed AD0–AD7 bus reduces address/data line count, and its 70 ns read access time ensures responsive execution in microprocessor-based systems. The AT27LV520-70XU is commonly deployed in industrial controllers and legacy computing platforms where data integrity and long-term stability are critical.
Does the AT27LV520-70XU support both 3.3 V and 5 V operation simultaneously?
No - the AT27LV520-70XU operates in one supply mode at a time: either 3.0–3.6 V or 4.5–5.5 V. However, it is designed to be compatible with both voltage domains: at 3.0 V, its outputs meet TTL logic thresholds and interface directly with 5 V peripherals, enabling use in dual-voltage systems without level shifters. The AT27LV520-70XU does not require simultaneous dual-rail supply.
Can the AT27LV520-70XU be reprogrammed after initial programming?
No - the AT27LV520-70XU is a one-time programmable (OTP) EPROM. Once programmed, its memory contents cannot be erased or rewritten. Programming is performed using a 13.0 V VPP supply and 50 µs ALE pulses; verification is built into the algorithm, but no erase mechanism exists. This makes the AT27LV520-70XU suitable for applications requiring tamper-resistant, unchangeable code storage.
What package type does the AT27LV520-70XU use, and is it RoHS-compliant?
The AT27LV520-70XU uses a 20-lead TSSOP (Thin Shrink Small Outline Package) with 4.4 mm body width and 0.65 mm lead pitch, compliant with JEDEC MO-153 AC. It is manufactured in a green (Pb/halide-free) configuration, meeting RoHS Directive 2011/65/EU requirements. The "XU" suffix in AT27LV520-70XU explicitly denotes this RoHS-compliant TSSOP variant.
How does the AT27LV520-70XU achieve low standby current, and what conditions trigger it?
The AT27LV520-70XU achieves ≤20 µA standby current (at VCC = 3.6 V) by asserting ALE high, which disables internal address decoding and output drivers. This state requires no additional control signals - OE/VPP must also be high, and address/data pins may float or be held at valid logic levels. The AT27LV520-70XU maintains full data retention in standby, making it ideal for battery-backed systems where power conservation is essential.
AT27LV520-70XU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- 70 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:
- 20-TSSOP
AT27LV520-70XU FAQ
1.How can I place an order for AT27LV520-70XU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27LV520-70XU 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 AT27LV520-70XU reliable?
The price and inventory of AT27LV520-70XU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27LV520-70XU is usually 5 days.
3.What payment methods are accepted for AT27LV520-70XU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27LV520-70XU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27LV520-70XU?
AT27LV520-70XU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27LV520-70XU 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 AT27LV520-70XU?
For technical support, including AT27LV520-70XU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27LV520-70XU requirements.
6.How does Aetrix verify that AT27LV520-70XU is sourced from the original manufacturer or authorized distributors?
All AT27LV520-70XU 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 AT27LV520-70XU meets industry standards.
7.What is the process for return or replacement of AT27LV520-70XU?
All AT27LV520-70XU units undergo pre-shipment inspection (PSI). If there is an issue with AT27LV520-70XU, 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 AT27LV520-70XU part is unused and in its original packaging.
Return procedure for AT27LV520-70XU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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