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Microchip Technology AT27C512R-45TU
- Part No.:
- AT27C512R-45TU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
AT27C512R-45TU.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,309
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Product details
Overview
AT27C512R-45TU from Atmel is a 64K × 8-bit one-time programmable EPROM (OTP EPROM) with 45 ns read access time, 5V ±10% supply operation, and industrial temperature range (–40°C to +85°C). It features CMOS/TTL-compatible I/O, dual-line control (CE/OE), and integrated product identification code for automated programming. Used in firmware storage for microprocessor systems requiring non-volatile, low-latency code execution without wait states.
For engineers reviewing the AT27C512R-45TU datasheet, AT27C512R-45TU pinout, AT27C512R-45TU application, or AT27C512R-45TU equivalent, this page delivers verified package mapping (28-lead TSOP), JEDEC-compliant timing parameters, rapid programming algorithm details (100 µs/byte), ESD/latchup immunity specs, and real-world system integration guidance including decoupling capacitor requirements.
Technical Context
The AT27C512R-45TU implements a parallel-addressed OTP EPROM architecture with 16 address inputs (A0–A15), 8 bidirectional data outputs (O0–O7), and two active-low control lines: CE (Chip Enable) and OE/VPP (Output Enable / Programming Voltage). Its read mode requires only 5V; programming requires VCC = 6.5V and OE/VPP = 13.0V.
It supports three distinct operating modes: Read (CE=OE=VIL), Standby (CE=VIH), and Rapid Program (CE=VIL, OE/VPP=VPP). The integrated product identification code uses A9 at 12.0V and A0 toggling to return manufacturer (0x1E) and device (0x0D) bytes - enabling automatic algorithm selection in production programmers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 64K × 8-bit (524,288 bits); sufficient for boot code or fixed firmware in embedded controllers. |
| Read Access Time | 45 ns max; eliminates WAIT states on 5 MHz microprocessors and enables direct bus interfacing. |
| VCC Supply | 5V ±10%; compatible with standard TTL/CMOS logic rails without regulation overhead. |
| Active Current | 20 mA max at 5 MHz; enables low-power operation in battery-backed or energy-constrained systems. |
| Standby Current | 100 µA max; supports ultra-low quiescent power during idle cycles in industrial controllers. |
| ESD Protection | 2,000V HBM; ensures robustness during handling and PCB assembly in non-EPA environments. |
| Latchup Immunity | 200 mA; prevents destructive latchup under transient overvoltage or ground bounce events. |
Pinout & Package
AT27C512R-45TU is supplied in a 28-lead Thin Small Outline Package (TSOP, Type 1), JEDEC MO-183 compliant, with 8 mm × 13.4 mm footprint and gull-wing leads. Pin 1 identifier located at top-left corner with beveled edge marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit parallel address bus; selects one of 64K byte locations for read or program operations. |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus; drives valid logic levels during read; high-impedance when disabled. |
| CE | Chip Enable | Active-low global enable; controls device activation and reduces standby current when deasserted. |
| OE/VPP | Output Enable / Program Supply | Dual-function pin: OE during read (enables output drivers); VPP = 13.0V during programming (enables internal high-voltage circuitry). |
| VCC | Power Supply | 5V ±10% main supply; must be applied before/with OE/VPP and removed after/with OE/VPP to prevent latchup. |
| GND | Ground Reference | Signal and power return path; requires local 0.1 µF ceramic decoupling per device per datasheet Section 3. |
Key Features
| Feature | Design Value |
|---|---|
| Rapid Programming Algorithm | 100 µs/byte typical programming pulse width; reduces firmware burn time by >5× vs legacy EPROMs and enables high-throughput production programming. |
| Integrated Product Identification Code | Manufacturer ID (0x1E) and Device Code (0x0D) returned via A9/A0 handshake; eliminates manual algorithm selection in automated programmers. |
| Two-Line Control Architecture | Separate CE and OE/VPP pins allow independent bus arbitration and eliminate contention during multi-device memory mapping. |
| Green (Pb/Halide-free) Packaging | RoHS-compliant TSOP package; meets EU Directive 2011/65/EU and supports environmentally regulated industrial deployments. |
| Industrial Temperature Range | –40°C to +85°C operational range; validated for use in factory automation, motor drives, and outdoor instrumentation. |
Applications
| Firmware Storage for PLCs | Boot ROM in Industrial Controllers |
|---|---|
Use Scenario: Stores ladder logic interpreter and I/O configuration tables in programmable logic controllers deployed in manufacturing cells. IC Role / Device Role / Timing Role: Non-volatile firmware repository accessed at power-on reset; provides deterministic 45 ns instruction fetch latency to CPU bus. Use Value: Eliminates reliance on external flash or EEPROM, reducing BOM count and eliminating firmware corruption risks from write-cycle wear-out. | Use Scenario: Holds bootloader and hardware initialization routines in DIN-rail mounted industrial controllers managing HVAC or power distribution. IC Role / Device Role / Timing Role: Primary boot memory mapped to CPU reset vector; operates at full 5 MHz bus speed without wait-state insertion. Use Value: Guarantees sub-50 ns instruction fetch timing critical for deterministic startup sequence execution in safety-critical systems. |
| Configuration Memory in Test Equipment | Firmware Image Storage in Legacy Medical Devices |
Use Scenario: Stores calibration coefficients, test pattern sets, and user interface strings in automated circuit board testers. IC Role / Device Role / Timing Role: Static configuration store accessed via parallel bus during self-test initialization phase. Use Value: Provides bit-perfect, tamper-proof data retention over 20+ years - essential for metrology-grade repeatability compliance. | Use Scenario: Retains diagnostic firmware and device-specific calibration maps in Class II medical instruments with long product lifecycles (15+ years). IC Role / Device Role / Timing Role: One-time programmed, field-upgrade-inhibited memory ensuring regulatory traceability and version lock. Use Value: Meets FDA 21 CFR Part 11 requirements for immutable firmware archives and eliminates risk of accidental reprogramming in clinical settings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C512-45DC | Same 64K×8 organization and 45 ns access, but uses 28-pin PDIP (not TSOP); higher standby current (200 µA vs 100 µA). | Preferred for through-hole prototyping or legacy board rework where TSOP footprint unavailable. | Select AM27C512-45DC only if mechanical compatibility with existing PDIP sockets is required; not suitable for new surface-mount designs. |
| MX27C512L-45PC | 45 ns access, 5V supply, but lacks integrated product ID code and rapid programming support; requires external VPP switching. | Suitable for cost-sensitive applications where automated programming is not used and manual algorithm setup is acceptable. | Choose MX27C512L-45PC only when programming infrastructure does not require ID-based auto-detection and layout allows discrete VPP routing. |
Compared with AM27C512-45DC and MX27C512L-45PC, the AT27C512R-45TU delivers superior production efficiency via its integrated identification code and faster programming, while its TSOP package enables higher board density - making it optimal for new industrial controller designs requiring RoHS compliance and automated manufacturing.
Availability
AT27C512R-45TU is available at Aetrix Electronics and suitable for firmware storage in programmable logic controllers, boot ROM in industrial controllers, and configuration memory in automated test equipment requiring stable component supply across extended product lifecycles.
Supply support for AT27C512R-45TU 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 was a U.S.-based semiconductor company specializing in microcontrollers, non-volatile memory, and wireless solutions before its acquisition by Microchip Technology in 2016. Its legacy EPROM products remain widely deployed in industrial systems.
The AT27C512R-45TU belongs to Atmel's OTP EPROM product line, designed specifically for reliable, low-power, pin-compatible firmware storage in microprocessor-based industrial and automotive systems where data immutability and long-term retention are mandatory.
FAQ
What is the programming voltage requirement for AT27C512R-45TU?
The AT27C512R-45TU requires OE/VPP = 13.0 V ± 0.25 V and VCC = 6.5 V ± 0.25 V during programming. These voltages must be applied simultaneously with proper sequencing: VCC must be applied before or concurrently with OE/VPP, and removed after or concurrently with OE/VPP. Failure to observe this sequence risks latchup or permanent damage. The AT27C512R-45TU does not support in-system programming and must be programmed in a dedicated EPROM programmer.
Does AT27C512R-45TU support automatic device identification during programming?
Yes, the AT27C512R-45TU implements an Integrated Product Identification Code that returns Manufacturer ID (0x1E) and Device Code (0x0D) when A9 is driven to 12.0 V and A0 is toggled. This feature enables industry-standard programmers to auto-select correct algorithms and verify programming conditions. The AT27C512R-45TU's identification protocol is electrically defined and tested per datasheet Section 17, ensuring compatibility with Data I/O, BP Microsystems, and Xeltek programmers.
What decoupling capacitors are required for stable operation of AT27C512R-45TU?
The AT27C512R-45TU requires a 0.1 µF high-frequency ceramic capacitor placed between VCC and GND, mounted as close as possible to the device pins. For systems with multiple AT27C512R-45TU devices or large EPROM arrays, a 4.7 µF bulk electrolytic capacitor must also be added near the power entry point. These values are specified in Section 3 ("System Considerations") of the AT27C512R-45TU datasheet to suppress transient excursions during CE switching and ensure reliable read/write margins.
Is AT27C512R-45TU compatible with 3.3V logic systems?
No, the AT27C512R-45TU is strictly a 5V-only device: its DC input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V) and AC timing parameters assume 5V ±10% supply. Driving its address or control inputs from 3.3V logic may result in marginal or non-functional operation due to insufficient VIH margin. Interfacing with 3.3V microcontrollers requires level-shifting circuitry. The AT27C512R-45TU has no 3.3V tolerance or mixed-voltage operation capability.
What is the data retention lifetime of AT27C512R-45TU under industrial temperature conditions?
The AT27C512R-45TU guarantees minimum 20-year data retention at +85°C case temperature, per Atmel's qualification testing per JESD22-A108. This specification applies to the industrial-grade variant (–40°C to +85°C), which includes the AT27C512R-45TU. Retention is measured under worst-case bias conditions and confirmed via accelerated life testing; actual field lifetime typically exceeds 30 years at lower ambient temperatures. The AT27C512R-45TU's retention performance is documented in the device reliability report, not the general datasheet.
AT27C512R-45TU 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:
- 45 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSOP
AT27C512R-45TU FAQ
1.How can I place an order for AT27C512R-45TU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C512R-45TU 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 AT27C512R-45TU reliable?
The price and inventory of AT27C512R-45TU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C512R-45TU is usually 5 days.
3.What payment methods are accepted for AT27C512R-45TU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C512R-45TU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C512R-45TU?
AT27C512R-45TU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C512R-45TU 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 AT27C512R-45TU?
For technical support, including AT27C512R-45TU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C512R-45TU requirements.
6.How does Aetrix verify that AT27C512R-45TU is sourced from the original manufacturer or authorized distributors?
All AT27C512R-45TU 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 AT27C512R-45TU meets industry standards.
7.What is the process for return or replacement of AT27C512R-45TU?
All AT27C512R-45TU units undergo pre-shipment inspection (PSI). If there is an issue with AT27C512R-45TU, 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 AT27C512R-45TU part is unused and in its original packaging.
Return procedure for AT27C512R-45TU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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