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Microchip Technology AT27C512R-12TI
- Part No.:
- AT27C512R-12TI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
AT27C512R-12TI.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,442
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Product details
Overview
AT27C512R-12TI from Microchip Technology (formerly Atmel) is a 512 Kbit (64K × 8) one-time programmable EPROM used for nonvolatile firmware storage in embedded microprocessor systems. It delivers 45 ns read access time, operates from a single 5V ±10% supply, and supports industrial temperature range (–40°C to +85°C) in a 28-lead TSOP package.
For engineers reviewing the AT27C512R-12TI datasheet, AT27C512R-12TI pinout, AT27C512R-12TI application, or AT27C512R-12TI equivalent, this page provides verified timing specs, JEDEC-standard package mapping, Rapid™ programming behavior, CMOS/TTL I/O compatibility, and real-world system integration guidance including decoupling requirements and bus contention prevention.
Technical Context
The AT27C512R-12TI implements a two-line control architecture with Chip Enable (CE) and Output Enable/VPP (OE/VPP), enabling flexible bus arbitration and eliminating WAIT states in high-speed 8-bit microprocessor interfaces. Its address space spans A0–A15 (16-bit), supporting direct byte-level access without external latching.
During programming, OE/VPP serves as the 12.0 V ±0.5 V programming voltage input while CE pulses at 95–105 µs width trigger the Rapid™ algorithm-100 µs/byte typical-with integrated verification loops per address. The device includes an electronically readable Product Identification Code (Manufacturer ID = 0x1E, Device ID = 0x0D) accessed via A9 high-voltage and A0 toggling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 524,288 bits (64K × 8); supports full firmware image storage for 8-bit MCUs without external memory management. |
| Read Access Time | 120 ns max (tACC); enables direct connection to 8-MHz Z80, 6502, or 8085-based systems without wait-state insertion. |
| VCC Supply | 5V ±10%; compatible with standard logic rails and eliminates need for auxiliary voltage regulators. |
| Active Current | 20 mA max at 5 MHz; allows stable operation under sustained read bursts in power-constrained industrial controllers. |
| Standby Current | 100 µA max; supports low-power sleep modes in battery-backed or energy-sensitive applications. |
| ESD Protection | 2,000V HBM; ensures robustness during board handling and in-field rework without additional protection circuitry. |
| Latchup Immunity | 200 mA; prevents destructive latchup events under transient overvoltage or ground bounce conditions. |
Pinout & Package
AT27C512R-12TI is packaged in a 28-lead Thin Small Outline Package (TSOP, Type 1, JEDEC MO-153), 8.10 mm × 13.7 mm body, 0.55 mm pitch, gull-wing leads. Pin 1 marked by index notch; pin 14 = GND, pin 28 = VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit parallel address bus; fully decoded internally-no external address demultiplexing required. |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus (output-only in read mode); TTL/CMOS-compatible drive strength (IOH = –400 µA, IOL = 2.1 mA). |
| CE | Chip Enable | Primary device select; must be low for read or program operations; controls standby current state when high. |
| OE/VPP | Output Enable / Programming Voltage | Low during read to enable outputs; driven to 12.0 V ±0.5 V during programming to activate internal high-voltage circuitry. |
| NC | No Connect | Pins 7, 12, 17, 21 (TSOP top view); must remain unconnected-no internal bonding or function. |
| GND | Ground Reference | Pin 14; primary return path for VCC and I/O currents; requires dedicated low-inductance PCB trace. |
| VCC | Power Supply | Pin 28; supplies core logic and output drivers; requires local 0.1 µF ceramic decoupling per device. |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time with automatic verify-and-reprogram loop-reduces production burn-in cycle time by >60% vs. legacy EPROMs. |
| Integrated Product ID Code | Manufacturer ID (0x1E) and Device ID (0x0D) accessible via A9 = 12V and A0 toggle-enables automated programmer validation and BOM traceability. |
| Two-Line Control (CE + OE/VPP) | Eliminates bus contention in multi-device systems; allows independent gating of chip select and output enable for clean signal timing. |
| JEDEC-Standard TSOP Package | 28-lead TSOP (Type 1) footprint matches industry-standard layout templates-no custom PCB redesign needed for drop-in replacement. |
| Industrial Temperature Range | –40°C to +85°C operation validated across full speed grade (120 ns); suitable for motor drives, PLCs, and factory automation hardware. |
Applications
| Industrial PLC Firmware Storage | Legacy Microcontroller Boot ROM |
|---|---|
|
Use Scenario: Storing ladder logic interpreter and I/O configuration tables in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile boot-time code storage with deterministic 120 ns read latency to meet hard real-time scan-cycle deadlines. Use Value: Eliminates reliance on slow serial EEPROM or external flash; enables sub-100 µs instruction fetch from 8-bit data bus without wait states. |
Use Scenario: Hosting startup firmware for Z80- or 8085-based test equipment where field-upgradability is not required. IC Role / Device Role / Timing Role: Fixed-function ROM providing reset vector, interrupt vectors, and minimal BIOS routines. Use Value: Guarantees bit-perfect firmware execution across decades; immune to accidental overwrite or corruption during power cycling. |
| Automotive Instrument Cluster Memory | Medical Device Calibration Data |
|
Use Scenario: Holding gauge calibration coefficients and display initialization sequences in analog/digital instrument clusters. IC Role / Device Role / Timing Role: OTP storage for safety-critical static data; accessed only during power-on self-test (POST). Use Value: Meets AEC-Q100 stress requirements for automotive temp range (–40°C to +125°C variant available); no risk of data drift over lifetime. |
Use Scenario: Storing factory-trimmed sensor offset/gain values in portable ECG or blood glucose meters. IC Role / Device Role / Timing Role: Secure, tamper-proof memory for regulatory-mandated calibration constants. Use Value: Prevents unauthorized modification post-certification; 2,000V ESD rating protects against handling damage during assembly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C512-12DC | 120 ns access, same 64K×8 organization, but uses 28-pin PDIP (not TSOP); higher standby current (1 mA vs. 100 µA). | Requires PCB layout change for through-hole mounting; less suitable for space-constrained SMT designs. | Select if legacy through-hole assembly is mandated and board real estate is not constrained. |
| MX27C512-12PC | Same speed grade and pinout, but lacks Integrated Product ID Code and Rapid™ programming support; slower typical programming (200 µs/byte). | Not compatible with ID-aware programmers; increases production programming time and reduces traceability. | Choose only if cost is primary driver and automated programming validation is unnecessary. |
Compared with AM27C512-12DC and MX27C512-12PC, the AT27C512R-12TI offers superior power efficiency, TSOP packaging for modern SMT lines, and built-in identification-making it optimal for new industrial designs requiring long-term supply stability and production traceability.
Availability
AT27C512R-12TI is available at Aetrix Electronics and suitable for industrial PLCs, legacy microcontroller boot systems, and automotive instrument clusters requiring stable component supply across extended product lifecycles.
Supply support for AT27C512R-12TI 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
Microchip Technology acquired Atmel in 2016 and maintains full support for legacy Atmel memory products, including documentation, cross-reference tools, and long-term supply assurance.
The AT27C512R-12TI belongs to Atmel's 27C-series OTP EPROM family, designed specifically for reliable, low-cost firmware storage in resource-constrained 8-bit embedded systems where reprogrammability is unnecessary.
FAQ
What is the maximum operating temperature range for the AT27C512R-12TI?
The AT27C512R-12TI is rated for industrial temperature operation from –40°C to +85°C. This range is validated across all AC and DC parameters-including 120 ns access time, 20 mA active current, and 100 µA standby current-ensuring consistent performance in factory automation, motor control, and outdoor embedded equipment.
Does the AT27C512R-12TI require a separate programming voltage supply?
Yes-the AT27C512R-12TI uses the OE/VPP pin as a dual-function terminal: it acts as Output Enable during read mode (driven to VIL) and as a 12.0 V ±0.5 V programming voltage input during programming. A dedicated 12 V source with current limiting is required; VCC remains at 5 V during programming.
Can the AT27C512R-12TI be used as a direct replacement for the AT27C512-12TI?
No-the AT27C512R-12TI includes the Rapid™ programming algorithm, Integrated Product ID Code, and enhanced ESD/latchup specifications absent in the original AT27C512-12TI. While pinout and basic read functionality match, programming equipment must support the R-series features to ensure reliability.
What decoupling capacitance is required for stable operation of the AT27C512R-12TI?
Each AT27C512R-12TI requires a minimum 0.1 µF high-frequency ceramic capacitor placed between VCC and GND, mounted as close as possible to pins 28 and 14. For boards with multiple EPROMs, add a 4.7 µF bulk electrolytic capacitor near the power entry point to suppress array-level supply ripple.
Is the AT27C512R-12TI RoHS compliant?
Yes-the AT27C512R-12TI manufactured after 2006 meets RoHS Directive 2011/65/EU. Lead-free TSOP packaging and halogen-free molding compound are standard; full compliance documentation is available upon request from Aetrix Electronics.
AT27C512R-12TI 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSOP
AT27C512R-12TI FAQ
1.How can I place an order for AT27C512R-12TI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C512R-12TI 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-12TI reliable?
The price and inventory of AT27C512R-12TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C512R-12TI is usually 5 days.
3.What payment methods are accepted for AT27C512R-12TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C512R-12TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C512R-12TI?
AT27C512R-12TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C512R-12TI 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-12TI?
For technical support, including AT27C512R-12TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C512R-12TI requirements.
6.How does Aetrix verify that AT27C512R-12TI is sourced from the original manufacturer or authorized distributors?
All AT27C512R-12TI 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-12TI meets industry standards.
7.What is the process for return or replacement of AT27C512R-12TI?
All AT27C512R-12TI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C512R-12TI, 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-12TI part is unused and in its original packaging.
Return procedure for AT27C512R-12TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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