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Microchip Technology AT27LV512A-12TC
- Part No.:
- AT27LV512A-12TC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
AT27LV512A-12TC.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,669
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Product details
Overview
AT27LV512A-12TC from Atmel is a 512 Kbit (64K × 8) one-time programmable EPROM with dual-voltage operation (3.0–3.6 V or 4.5–5.5 V), 120 ns read access time, and JEDEC-standard 28-lead TSOP packaging. It serves as nonvolatile program storage in battery-powered portable systems, embedded controllers, and legacy microprocessor-based designs requiring low-power, pin-compatible replacement for AT27C512R.
For engineers reviewing the AT27LV512A-12TC datasheet, AT27LV512A-12TC pinout, AT27LV512A-12TC application, or AT27LV512A-12TC equivalent, key selection criteria include its 120 ns read timing at 3.3 V, <20 µA standby current, dual-supply compatibility, Rapid™ programming algorithm (100 µs/byte), and support for TTL-level interfacing across voltage domains.
Technical Context
The AT27LV512A-12TC implements a CMOS OTP EPROM architecture with two-line control (CE and OE/VPP), enabling bus contention avoidance in multi-device memory systems. Its address decoding covers A0–A15 (16-bit), supporting full 64K-byte addressing without external latching.
It features integrated product identification (manufacturer code 0x1E, device code 0x0D) and supports both standard 5 V programming (VPP = 13.0 V) and 3.3 V read operation. The OE/VPP pin serves dual roles: output enable during read and high-voltage supply during programming - eliminating need for separate VPP routing in most systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 524,288 bits (64K × 8); provides full byte-wide instruction/data storage for 8-bit microcontrollers. |
| Read Access Time | 120 ns max at VCC = 3.0–3.6 V; meets timing budgets for 8 MHz Z80, 6502, and early ARM7 systems. |
| Supply Voltage Range | 3.0–3.6 V or 4.5–5.5 V; enables drop-in use in mixed-voltage boards and hot-pluggable card designs. |
| Standby Current | 20 µA max at VCC = 3.6 V; extends battery life in portable instrumentation and handheld terminals. |
| Programming Speed | 100 µs/byte typical (Rapid™ algorithm); reduces production programming cycle time by >5× vs. legacy EPROMs. |
| I/O Compatibility | CMOS/TTL input thresholds and LVTTL-compliant outputs; interfaces directly with 5 V logic without level shifters. |
| ESD/Latchup | 2,000 V HBM ESD rating and 200 mA latchup immunity; suitable for industrial environments with unshielded connectors. |
Pinout & Package
AT27LV512A-12TC uses a 28-lead Thin Small Outline Package (TSOP, Type 1, 8.1 mm × 13.7 mm), compliant with JEDEC MO-153AA. Pin 1 is marked via index notch; pins are numbered counterclockwise from top-left corner in top view.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit parallel address bus; fully decoded internally to select one of 65,536 bytes. |
| O0–O7 | Data Outputs | True TTL-compatible outputs; drive 2.1 mA low / -400 µA high at 3.3 V, compatible with 5 V bus loads. |
| CE | Chip Enable | Active-low chip select; controls device activation and power state transition between active/standby. |
| OE/VPP | Output Enable / Programming Supply | Dual-function pin: enables data output during read; supplies 13.0 V programming voltage during write mode. |
| VCC | Power Supply | Accepts 3.0–3.6 V or 4.5–5.5 V; powers core logic and I/O buffers; requires local 0.1 µF ceramic decoupling. |
| GND | Ground Reference | Signal and power return; must be connected to system ground plane with minimal impedance. |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time with automatic verify-reprogram loop; eliminates manual verification steps in production. |
| Dual-Voltage Read Operation | Operates at 3.3 V with TTL-level outputs compatible with 5 V logic families - no level-shifter required in mixed-supply systems. |
| Integrated Product ID Code | Manufacturer ID (0x1E) and Device ID (0x0D) accessible via A9/A0 toggling; enables auto-detection in universal programmers. |
| JEDEC-Standard Packages | 28-lead TSOP footprint matches industry-standard memory layouts; allows direct PCB substitution for AT27C512R in SOIC/TSOP designs. |
| Low-Power Standby Mode | 20 µA max ICC at 3.6 V; reduces quiescent power in always-on embedded systems such as metering and telemetry modules. |
Applications
| Industrial Control Panels | Legacy Microcomputer Systems |
|---|---|
Use Scenario: Nonvolatile firmware storage in PLC I/O modules operating on 3.3 V rails with intermittent 5 V fieldbus communication. IC Role / Device Role / Timing Role: OTP EPROM providing boot code and configuration tables; accessed via 8-bit parallel bus with CE-controlled page selection. Use Value: Dual-voltage support avoids redesign when upgrading from 5 V to 3.3 V main power while retaining compatibility with existing 5 V RS-485 transceivers. |
Use Scenario: Replacement ROM in vintage Z80-based test equipment where original AT27C512R sockets remain but power supply has been modernized to 3.3 V. IC Role / Device Role / Timing Role: Drop-in memory component delivering identical 64K × 8 organization and pinout; supports same address decoding and wait-state logic. Use Value: 120 ns access time ensures no timing violation in existing 4–6 MHz CPU buses; eliminates need for clock stretching or hardware modification. |
| Portable Data Loggers | Medical Diagnostic Handhelds |
Use Scenario: Battery-powered environmental sensor node storing calibration coefficients and firmware with 10-year data retention requirement. IC Role / Device Role / Timing Role: Low-power OTP storage holding immutable sensor algorithms; accessed only during startup or firmware update. Use Value: 20 µA max standby current extends AA/AAA battery life beyond 5 years in sleep mode; CMOS process ensures data integrity over temperature range. |
Use Scenario: Embedded controller in FDA-cleared handheld ultrasound probe requiring certified, unalterable boot firmware and diagnostic routines. IC Role / Device Role / Timing Role: One-time programmable ROM securing critical initialization sequences; immune to accidental overwrite or corruption during field use. Use Value: Rapid™ programming enables final-test programming in cleanroom environment; product ID code supports traceability and revision control per unit. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C512R-70PC | 5 V-only operation (4.5–5.5 V); 70 ns access; 28-pin PDIP package; no 3.3 V support. | Requires dedicated 5 V rail; incompatible with battery-powered 3.3 V systems; higher active power (20 mA @ 5 MHz). | Select only if board already uses 5 V logic and lacks space for decoupling capacitors needed for 3.3 V conversion. |
| MX29LV512CTI-12G | 3.3 V flash memory (not OTP); 120 ns access; 28-pin TSOP; supports erase/rewrite; higher endurance (100k cycles). | Enables field firmware updates; requires different command protocol and erase sequencing; not pin-compatible due to different control pin mapping (WE# instead of OE/VPP). | Choose when reprogrammability is required; avoid if design relies on OTP security or must retain exact AT27LV512A timing and control interface. |
Compared with AT27C512R-70PC, the AT27LV512A-12TC enables lower-system-power designs without sacrificing speed or footprint; compared with MX29LV512CTI-12G, it offers simpler control logic and guaranteed write-once integrity but lacks in-system reprogrammability.
Availability
AT27LV512A-12TC is available at Aetrix Electronics and suitable for industrial control panels, legacy microcomputer retrofits, and portable data loggers requiring stable component supply, long-term lifecycle support, and JEDEC-standard TSOP compatibility.
Supply support for AT27LV512A-12TC 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 for industrial, automotive, and consumer applications.
The AT27LV512A product line was designed to deliver low-voltage OTP EPROM functionality for portable and mixed-supply embedded systems, bridging the performance gap between legacy 5 V EPROMs and emerging 3.3 V microcontroller platforms.
FAQ
What is the maximum operating temperature range for the AT27LV512A-12TC?
The AT27LV512A-12TC is rated for commercial temperature range (0°C to +70°C) as indicated by the "C" suffix in the ordering code and confirmed in the Ordering Information table. It is not qualified for industrial (-40°C to +85°C) operation - that variant carries the "I" suffix (e.g., AT27LV512A-12TI). Thermal derating or extended-life validation is not supported per datasheet specifications.
Can the AT27LV512A-12TC be programmed using standard EPROM programmers?
Yes, the AT27LV512A-12TC programs identically to the AT27C512R and uses the same programming equipment. It requires VCC = 6.5 V and OE/VPP = 13.0 V during programming, with a 100 µs CE pulse width per byte. Its Integrated Product Identification Code (0x1E/0x0D) ensures automatic algorithm selection in industry-standard programmers like BP Microsystems or Xeltek units.
Does the AT27LV512A-12TC support true 3.3 V-only operation without 5 V present?
Yes, the AT27LV512A-12TC operates fully within 3.0 V to 3.6 V for read mode, delivering TTL-compatible outputs (VOH ≥ 2.4 V, VOL ≤ 0.4 V) that interface directly with 5 V logic families. No 5 V supply is required - unlike some hybrid devices, it does not mandate dual-rail support for basic functionality.
What decoupling capacitance is required for stable operation of the AT27LV512A-12TC?
The AT27LV512A-12TC requires a minimum 0.1 µF high-frequency ceramic capacitor placed between VCC and GND, mounted as close as possible to the device's pins. For systems with multiple EPROMs or noisy power distribution, a 4.7 µF bulk electrolytic capacitor should also be added near the array's power entry point to suppress low-frequency ripple and transient excursions.
Is the AT27LV512A-12TC pin-compatible with the AT27C512R in TSOP packages?
Yes, the AT27LV512A-12TC (28T package) shares identical pinout, signal definitions, and physical dimensions with the AT27C512R-70TC and AT27C512R-90TC TSOP variants. Both comply with JEDEC MO-153AA, allowing direct socket replacement - though voltage and timing parameters differ, requiring verification of system-level timing margins.
AT27LV512A-12TC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 28-TSSOP (0.465", 11.80mm Width)
- Packaging:
- Tray
- 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:
- 120 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:
- 28-TSOP
AT27LV512A-12TC FAQ
1.How can I place an order for AT27LV512A-12TC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27LV512A-12TC 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-12TC reliable?
The price and inventory of AT27LV512A-12TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27LV512A-12TC is usually 5 days.
3.What payment methods are accepted for AT27LV512A-12TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27LV512A-12TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27LV512A-12TC?
AT27LV512A-12TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27LV512A-12TC 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-12TC?
For technical support, including AT27LV512A-12TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27LV512A-12TC requirements.
6.How does Aetrix verify that AT27LV512A-12TC is sourced from the original manufacturer or authorized distributors?
All AT27LV512A-12TC 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-12TC meets industry standards.
7.What is the process for return or replacement of AT27LV512A-12TC?
All AT27LV512A-12TC units undergo pre-shipment inspection (PSI). If there is an issue with AT27LV512A-12TC, 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-12TC part is unused and in its original packaging.
Return procedure for AT27LV512A-12TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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