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Microchip Technology AT27C512R-90TI
- Part No.:
- AT27C512R-90TI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
AT27C512R-90TI.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,470
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Product details
Overview
AT27C512R-90TI from Microchip Technology (formerly Atmel) is a 512 Kbit (64K × 8) one-time programmable EPROM used for nonvolatile firmware storage in embedded microcontroller systems. It operates from a single 5V ±10% supply, delivers 90 ns maximum address-to-output access time, supports industrial temperature range (–40°C to +85°C), and features CMOS/TTL-compatible I/O with dual-line control (CE/OE).
For engineers reviewing the AT27C512R-90TI datasheet, AT27C512R-90TI pinout, AT27C512R-90TI application, or AT27C512R-90TI equivalent, this page provides verified technical context, JEDEC-standard package mapping, Rapid™ programming timing, integrated product identification code support, and real-world system integration guidance for legacy 8-bit and 16-bit controller designs.
Technical Context
The AT27C512R-90TI implements a parallel-addressed OTP EPROM architecture with 16-bit address bus (A0–A15), 8-bit bidirectional data bus (O0–O7), and two independent control lines: Chip Enable (CE) and Output Enable/VPP. Its read operation requires only 5V, while programming demands VCC = 6.5V and OE/VPP = 13.0V.
It uses Atmel's scaled CMOS process to achieve 100 µA max standby current and 20 mA max active current at 5 MHz, with 2,000V ESD protection and 200 mA latchup immunity. The device supports rapid byte programming at 100 µs/byte (typical) and includes an integrated manufacturer/device identification code accessible via A9 and A0 under specific voltage conditions.
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 logic |
| Read Access Time | 90 ns max - eliminates WAIT states on Z80, 8086, and 68000-based systems running ≤11 MHz |
| Supply Voltage | 5V ±10% - compatible with standard TTL/CMOS logic rails; no auxiliary voltage required for read mode |
| Standby Current | 100 µA max - enables low-power retention in battery-backed or intermittently powered systems |
| Active Current | 20 mA max at 5 MHz - allows direct interface to microprocessor buses without current-limiting resistors |
| Programming Voltage | VPP = 13.0V ±0.25V - requires dedicated programmer circuitry; not compatible with standard 5V-only systems |
| ESD Protection | 2,000V HBM - meets industrial handling requirements without additional input protection |
| Operating Temperature | –40°C to +85°C - qualified for industrial control, instrumentation, and automotive body electronics |
Pinout & Package
AT27C512R-90TI is supplied in a 28-lead, 0.600" wide plastic dual inline package (PDIP), per JEDEC MS-011 AB. Pin 1 is index-marked; leads are tin-lead plated with 0.025" pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit unidirectional address bus; latched internally on CE assertion - enables full 64K address space decoding |
| O0–O7 | Data Outputs | 8-bit tristate CMOS/TTL-compatible outputs - directly drive microprocessor data bus without level-shifting |
| CE | Chip Enable | Active-low global enable; controls device power state and output driver activation - used for memory-mapped decode |
| OE/VPP | Output Enable / Programming Voltage | Active-low output gate during read; supplies 13V programming voltage during write - dual-function pin requires careful PCB routing |
| GND | Ground Reference | Signal and power return path - must be connected to system ground plane with low-inductance trace |
| VCC | Power Supply | +5V ±10% supply input - requires local 0.1 µF ceramic decoupling capacitor placed within 5 mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time - reduces production burn-in cycle time by >70% vs. legacy EPROMs |
| Integrated Product Identification Code | Manufacturer ID (0x1E) and Device Code (0x0D) readable via A9/VH and A0 toggle - enables automated programmer validation and BOM traceability |
| Two-Line Control Architecture | Independent CE and OE/VPP pins - prevents bus contention during partial-memory accesses and supports interleaved memory maps |
| JEDEC-Standard Packaging Options | 28P6 PDIP footprint - ensures drop-in compatibility with legacy sockets and rework-friendly through-hole assembly |
| High-Reliability CMOS Process | 200 mA latchup immunity and 2,000V ESD rating - eliminates need for external transient suppression in industrial environments |
Applications
| Industrial PLC Firmware Storage | Legacy Medical Device Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder-logic firmware in DIN-rail mounted programmable logic controllers operating in factory-floor environments with EMI and thermal cycling. IC Role / Device Role / Timing Role: Nonvolatile boot ROM providing deterministic 90 ns instruction fetch timing to 80C188EB or Z80 CPU subsystems. Use Value: Eliminates reliance on volatile RAM + battery backup; withstands –40°C to +85°C ambient and meets IEC 61000-4-2 Level 3 ESD immunity without added protection. |
Use Scenario: Holding certified bootloader and safety-critical initialization routines in Class II medical analyzers requiring long-term data integrity and regulatory traceability. IC Role / Device Role / Timing Role: One-time programmable firmware vault accessed during cold start; identification code supports FDA 21 CFR Part 11 audit logging. Use Value: Prevents unauthorized firmware modification post-certification; integrated ID bytes enable automated verification during manufacturing test and field service calibration. |
| Automotive Body Control Module | Test Equipment Calibration Data |
Use Scenario: Storing configuration tables and CAN message lookup logic in door module ECUs exposed to under-hood thermal stress and vibration. IC Role / Device Role / Timing Role: Read-only configuration store mapped into microcontroller address space; accessed synchronously with main MCU clock. Use Value: Qualified to –40°C to +125°C (via AT27C512R-90TA variant); 100 µA standby draw extends sleep-mode battery life in keyless entry systems. |
Use Scenario: Retaining factory-calibrated ADC offset/gain coefficients and sensor linearization curves in benchtop oscilloscopes and spectrum analyzers. IC Role / Device Role / Timing Role: Static calibration data repository read once at power-up; accessed via dedicated 8-bit bus isolated from main signal path. Use Value: Guarantees calibration persistence across 10+ years; Rapid™ programming enables efficient batch calibration during final test without reflow risk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C512-90DC | 90 ns access, 5V-only read, but requires 21V VPP for programming; no integrated ID code | Lacks product identification feature - requires external EEPROM or fuse-based tracking for traceability | Select when legacy AMI-compatible programmers are in use and ID code is unnecessary |
| MX27C512-90PC | 90 ns access, same 5V/13V programming scheme, but 200 µA max standby current and no automotive temp grade | Not qualified for –40°C to +125°C operation - unsuitable for under-hood automotive use | Select for cost-sensitive industrial designs where extended temperature range is not required |
Compared with AM27C512-90DC and MX27C512-90PC, the AT27C512R-90TI offers superior system-level reliability through its integrated identification code, lower standby current, and broader industrial temperature qualification - making it preferred for traceable, long-lifecycle embedded deployments.
Availability
AT27C512R-90TI is available at Aetrix Electronics and suitable for industrial control systems, legacy medical equipment upgrades, automotive body electronics, and test instrumentation requiring stable component supply over extended production lifecycles.
Supply support for AT27C512R-90TI 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. The company specializes in microcontrollers, analog, and nonvolatile memory solutions for industrial, automotive, and aerospace markets.
The AT27C512R-90TI belongs to Atmel's 27C-series OTP EPROM family, designed specifically for firmware and configuration storage in resource-constrained, long-lifecycle embedded systems where reprogrammability is unnecessary but data integrity and timing predictability are critical.
FAQ
What is the programming voltage requirement for AT27C512R-90TI?
The AT27C512R-90TI requires OE/VPP = 13.0V ±0.25V and VCC = 6.5V ±0.25V during programming. These voltages are strictly defined in the DC Programming Characteristics table and must be applied simultaneously with proper sequencing - VCC before or concurrent with OE/VPP, and removed concurrently or after. Standard 5V-only programmers cannot program the AT27C512R-90TI without voltage boosting circuitry.
Does AT27C512R-90TI support in-system programming?
No, the AT27C512R-90TI does not support in-system programming. It is a one-time programmable EPROM that requires removal from the target board and insertion into a dedicated UV-erasable or high-voltage programmer. The device lacks serial interfaces, command protocols, or internal state machines needed for ISP - programming must occur in a controlled fixture prior to soldering.
How is the Integrated Product Identification Code accessed on AT27C512R-90TI?
The Integrated Product Identification Code on AT27C512R-90TI is accessed by holding all address inputs low except A9 (set to 12.0V ±0.5V) and toggling A0 between low and high. When A0 = VIL, the Manufacturer ID (0x1E) appears on O7–O0; when A0 = VIH, the Device Code (0x0D) appears. This occurs only during read mode with CE and OE/VPP both asserted low.
What decoupling capacitors are required for stable operation of AT27C512R-90TI?
Each AT27C512R-90TI requires a 0.1 µF high-frequency ceramic capacitor connected between VCC and GND, placed within 5 mm of the device pins. For boards with multiple AT27C512R-90TI devices or large EPROM arrays, a 4.7 µF bulk electrolytic capacitor must also be placed near the power entry point - both capacitors stabilize transient currents during address/data transitions and prevent supply droop-induced read errors.
Is AT27C512R-90TI pin-compatible with other speed grades in the same package?
Yes, all AT27C512R speed grades (e.g., -45, -55, -70, -90, -12, -15) share identical pinouts, electrical signaling, and functional behavior across PDIP, PLCC, SOIC, and TSOP packages. The only difference is AC timing parameters - a -90TI can replace a -70TI in the same 28P6 socket without layout changes, though system timing margins must be re-verified against the slower 90 ns access specification.
AT27C512R-90TI 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:
- 90 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-90TI FAQ
1.How can I place an order for AT27C512R-90TI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C512R-90TI 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-90TI reliable?
The price and inventory of AT27C512R-90TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C512R-90TI is usually 5 days.
3.What payment methods are accepted for AT27C512R-90TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C512R-90TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C512R-90TI?
AT27C512R-90TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C512R-90TI 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-90TI?
For technical support, including AT27C512R-90TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C512R-90TI requirements.
6.How does Aetrix verify that AT27C512R-90TI is sourced from the original manufacturer or authorized distributors?
All AT27C512R-90TI 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-90TI meets industry standards.
7.What is the process for return or replacement of AT27C512R-90TI?
All AT27C512R-90TI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C512R-90TI, 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-90TI part is unused and in its original packaging.
Return procedure for AT27C512R-90TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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