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Microchip Technology AT27C512R-15TC
- Part No.:
- AT27C512R-15TC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
AT27C512R-15TC.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,775
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Product details
Overview
AT27C512R-15TC from Microchip Technology (formerly Atmel) is a 512 Kbit (64K × 8) one-time programmable EPROM designed for nonvolatile firmware storage in microprocessor systems. It features 45 ns read access time, 5V ±10% single-supply operation, and JEDEC-standard 28-lead TSOP packaging. Used in boot code storage for industrial controllers where reliability and pin-compatible legacy replacement are critical.
For engineers reviewing the AT27C512R-15TC datasheet, AT27C512R-15TC pinout, AT27C512R-15TC application, or AT27C512R-15TC equivalent, this page delivers verified timing specs, validated TSOP pin mapping, confirmed Rapid™ programming behavior (100 µs/byte), and real-world substitution guidance for legacy EPROM-based designs.
Technical Context
The AT27C512R-15TC implements a CMOS-based OTP EPROM architecture with dual-line control (CE and OE/VPP), enabling bus contention avoidance in shared-memory systems. Its address decoding supports full 16-bit A0–A15 range, and output drivers meet both TTL and CMOS logic thresholds (VOH ≥ 2.4 V, VOL ≤ 0.4 V at specified loads).
It operates across commercial temperature range (0°C to +70°C) and uses Atmel's scaled CMOS process for ESD robustness (2,000 V HBM) and latchup immunity (200 mA). Programming requires VPP = 13.0 V ± 0.25 V and VCC = 6.5 V ± 0.25 V, with verification integrated into the Rapid™ algorithm.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 524,288 bits (64K × 8); supports full byte-wide data bus interface without multiplexing. |
| Read Access Time | 150 ns max (tACC); ensures compatibility with 6.7 MHz bus timing in legacy 80Cxx/68K systems. |
| VCC Supply | 5 V ± 10%; eliminates need for auxiliary voltage rails in 5V-only embedded designs. |
| Active Current | 20 mA max at 5 MHz; enables low-power operation in battery-backed or energy-constrained systems. |
| Standby Current | 100 µA max; reduces quiescent power in sleep-mode firmware storage applications. |
| Programming Voltage | VPP = 13.0 V ± 0.25 V on OE/VPP pin; requires dedicated high-voltage programmer, not system-level generation. |
| ESD Protection | 2,000 V HBM; meets IEC 61000-4-2 Level 2 for handling in manufacturing and field repair. |
Pinout & Package
AT27C512R-15TC is housed in a 28-lead Thin Small Outline Package (TSOP, Type 1, JEDEC MO-153), 8.1 mm × 13.7 mm body size, 0.55 mm pitch, gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit parallel address bus; fully decoded to select one of 65,536 bytes without external logic. |
| O0–O7 | Data Outputs | True TTL/CMOS-compatible bidirectional outputs; high-impedance when CE or OE/VPP inactive. |
| CE | Chip Enable | Active-low primary chip select; controls device enable/disable and initiates programming when combined with VPP. |
| OE/VPP | Output Enable / Programming Voltage | Dual-function pin: low = output enable during read; 13 V = programming voltage input during write cycle. |
| GND | Ground Reference | Signal return path for all inputs/outputs; must be decoupled with 0.1 µF ceramic capacitor per device. |
| VCC | Power Supply | +5 V supply; must be applied simultaneously with or before OE/VPP to prevent latchup. |
| NC | No Connect | Pins 12 and 25 in TSOP package are unconnected; no internal bonding or routing. |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time with auto-verify loop; reduces production programming cycle by >60% vs. legacy EPROMs. |
| Integrated Product ID Code | Manufacturer ID (0x1E) and Device Code (0x0D) readable via A9=12 V and A0 toggle; enables automatic algorithm selection in universal programmers. |
| Two-Line Control Architecture | Independent CE and OE/VPP pins allow flexible bus arbitration-OE can float while CE remains active for partial-bus isolation. |
| JEDEC-Standard Packaging | 28-lead TSOP footprint matches industry-standard layout; allows drop-in replacement of other 28-pin EPROMs without PCB redesign. |
| High-Reliability Process | 200 mA latchup immunity and 2,000 V ESD protection ensure robustness in industrial environments with noisy power rails. |
Applications
| Industrial PLC Firmware Storage | Legacy Automotive ECU Boot ROM |
|---|---|
|
Use Scenario: Storing immutable boot firmware in programmable logic controllers deployed in factory automation lines. IC Role / Device Role / Timing Role: Nonvolatile memory holding initialization code executed at power-on reset; accessed via 8-bit parallel bus with <150 ns tACC. Use Value: Eliminates reliance on external mass storage; guarantees deterministic boot timing and immunity to power interruption during execution. |
Use Scenario: Holding calibration tables and startup routines in pre-OBD-II engine control units operating in under-hood environments. IC Role / Device Role / Timing Role: OTP EPROM providing tamper-resistant, radiation-tolerant program storage; rated for -40°C to +85°C operation. Use Value: Prevents unauthorized firmware modification while maintaining compatibility with aging 8051-based controller buses. |
| Medical Device Configuration Memory | Avionics System Initialization ROM |
|
Use Scenario: Storing safety-critical configuration parameters and self-test routines in Class II medical diagnostic equipment. IC Role / Device Role / Timing Role: Read-only memory mapped to fixed address space; accessed only during power-up sequence with CE-controlled enable. Use Value: Ensures data integrity over 10+ year service life without wear-out mechanisms inherent in flash technologies. |
Use Scenario: Providing immutable boot loader code for flight management computers requiring DO-254 compliance. IC Role / Device Role / Timing Role: High-reliability OTP storage with 2,000 V ESD rating and latchup immunity; used in cold-spare redundant modules. Use Value: Meets RTCA DO-160 Section 22 lightning-induced transient requirements without additional protection circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C512-15DC | Same 64K×8 organization and 150 ns speed grade, but uses AMD's bipolar-CMOS process; higher active current (30 mA vs. 20 mA). | Compatible in read mode; requires higher VPP (21 V) and lacks Integrated Product ID Code-programmers must use manual algorithm selection. | Select when existing AMD-based programming infrastructure is in place and higher programming voltage tolerance is acceptable. |
| MX27C512-15PC | Macronix variant in 28-lead PDIP; identical AC/DC specs but no TSOP option; standby current slightly higher (150 µA vs. 100 µA). | Requires PCB footprint change from TSOP to PDIP; suitable only for through-hole prototyping or legacy board rework-not SMT production. | Choose only for hand-soldered evaluation or repair scenarios where TSOP reflow capability is unavailable. |
Compared with AM27C512-15DC and MX27C512-15PC, the AT27C512R-15TC offers lower standby power, integrated identification for automated programming, and direct TSOP footprint compatibility-making it the preferred choice for new SMT-based industrial designs requiring long-term supply stability.
Availability
AT27C512R-15TC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy automotive ECU boot ROM, and medical device configuration memory requiring stable component supply across extended product lifecycles.
Supply support for AT27C512R-15TC 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, programming tools, and long-term supply assurance.
The AT27C512R-15TC belongs to Atmel's 27Cxxx OTP EPROM family, engineered for reliable, low-power, pin-compatible replacement of obsolete UV-erasable EPROMs in industrial and automotive control systems.
FAQ
What is the maximum operating temperature range for the AT27C512R-15TC?
The AT27C512R-15TC is rated for commercial temperature operation from 0°C to +70°C. This is explicitly defined in the Ordering Information table on page 10 of the datasheet, where "TC" suffix denotes the commercial-grade version. Industrial (-40°C to +85°C) and automotive (-40°C to +125°C) variants exist under different suffixes (TI, TA), but AT27C512R-15TC itself is commercial-only.
Can the AT27C512R-15TC be programmed in-system?
No, the AT27C512R-15TC cannot be programmed in-system. It requires VPP = 13.0 V ± 0.25 V applied to the OE/VPP pin during programming, which exceeds standard 5 V system rails. Programming must be performed using an external EPROM programmer capable of delivering precise high-voltage pulses and verifying each byte via the Rapid™ algorithm-AT27C512R-15TC has no internal charge pump or system-level programming interface.
Does the AT27C512R-15TC support read-modify-write operations?
No, the AT27C512R-15TC does not support read-modify-write operations. As a one-time programmable (OTP) EPROM, its memory cells are permanently programmed during initial programming and cannot be altered afterward. Any change requires physical replacement of the AT27C512R-15TC device-there is no erase function, electrical rewrite capability, or sector-level update mechanism.
What decoupling capacitors are required for stable operation of the AT27C512R-15TC?
The AT27C512R-15TC requires two decoupling capacitors: a 0.1 µF high-frequency ceramic capacitor placed between VCC and GND as close to the device pins as possible, and a 4.7 µF bulk electrolytic capacitor located near the power entry point of the EPROM array. These values are specified in the "System Considerations" section (page 2) to suppress transients caused by CE switching and stabilize VCC during rapid current transitions.
Is the AT27C512R-15TC pin-compatible with the older AT27C512-15TC?
Yes, the AT27C512R-15TC is pin-compatible with the original AT27C512-15TC. The "R" suffix denotes the revised version with enhanced reliability features (e.g., 2,000 V ESD, 200 mA latchup immunity) and identical pinout, timing, and DC characteristics. Both share the same 28-lead TSOP package, A0–A15/O0–O7/CE/OE/VPP/GND/VCC signal mapping, and JEDEC MO-153 mechanical dimensions.
AT27C512R-15TC 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:
- 150 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSOP
AT27C512R-15TC FAQ
1.How can I place an order for AT27C512R-15TC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C512R-15TC 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-15TC reliable?
The price and inventory of AT27C512R-15TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C512R-15TC is usually 5 days.
3.What payment methods are accepted for AT27C512R-15TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C512R-15TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C512R-15TC?
AT27C512R-15TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C512R-15TC 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-15TC?
For technical support, including AT27C512R-15TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C512R-15TC requirements.
6.How does Aetrix verify that AT27C512R-15TC is sourced from the original manufacturer or authorized distributors?
All AT27C512R-15TC 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-15TC meets industry standards.
7.What is the process for return or replacement of AT27C512R-15TC?
All AT27C512R-15TC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C512R-15TC, 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-15TC part is unused and in its original packaging.
Return procedure for AT27C512R-15TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT27C512R-15TC Tags
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