My Inquiry
My Account
Microchip Technology AT27C512R-90PI
- Part No.:
- AT27C512R-90PI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
AT27C512R-90PI.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,027
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT27C512R-90PI from Microchip Technology (formerly Atmel) is a 64K × 8-bit one-time programmable EPROM used for firmware storage in embedded microcontroller systems. It delivers 45 ns read access time, operates on a single 5V ±10% supply, and draws ≤100 µA standby current. Its dual-line control (CE/OE) enables bus contention avoidance in industrial control and legacy instrumentation applications.
For engineers reviewing the AT27C512R-90PI datasheet, AT27C512R-90PI pinout, AT27C512R-90PI application, or AT27C512R-90PI equivalent, this page provides verified package mapping (28-lead PDIP), JEDEC-compliant timing parameters, Rapid™ programming characteristics (100 µs/byte), CMOS/TTL I/O compatibility, and validated industrial-temperature operation (-40°C to +85°C).
Technical Context
The AT27C512R-90PI implements a standard OTP EPROM architecture with address decoding for A0–A15, 8-bit bidirectional data outputs (O0–O7), and two active-low control lines: Chip Enable (CE) and Output Enable/VPP. Its read mode requires only VCC = 5V ±10%; programming requires elevated VPP = 13.0V and VCC = 6.5V.
It supports three operating modes-Read, Standby, and Rapid Program-with distinct voltage and timing requirements per mode. The integrated Product Identification Code (Manufacturer ID = 0x1E, Device ID = 0x0D) enables automatic algorithm selection in industry-standard programmers, and its 2,000V ESD protection ensures robustness in manufacturing and field environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 524,288 bits (64K × 8), sufficient for boot code or configuration tables in 8-bit MCU systems |
| Read Access Time | 90 ns max - guarantees no WAIT states required on 11 MHz Z80 or 8 MHz 8051 buses |
| Supply Voltage | 5V ±10% - compatible with standard TTL/CMOS logic rails without regulation overhead |
| Standby Current | ≤100 µA - enables low-power hold state during processor sleep in battery-backed systems |
| Active Current | ≤20 mA at 5 MHz - supports sustained burst reads without thermal derating in compact enclosures |
| ESD Protection | 2,000V HBM - eliminates need for external TVS diodes in handling and board-level ESD zones |
| Temperature Range | -40°C to +85°C - qualified for industrial automation, motor drives, and HVAC controllers |
Pinout & Package
AT27C512R-90PI is supplied in a 28-lead, 0.600-inch wide plastic dual in-line package (PDIP), JEDEC MS-011 AB compliant, with 0.300-inch row spacing and 0.100-inch lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus interface; latched internally on CE falling edge for memory location selection |
| O0–O7 | Data Outputs | Tri-state CMOS/TTL-compatible outputs enabled only when CE = OE = low; high-impedance otherwise |
| CE | Chip Enable | Active-low global enable; places device in Standby (high-Z) when high, enabling multi-chip memory decoding |
| OE/VPP | Output Enable / Programming Voltage | Low during read (enables outputs); driven to 13.0V during programming to activate internal fuse-link circuitry |
| VCC | Power Supply | +5V ±10% main supply; must be applied before/with OE/VPP and removed after OE/VPP per safe programming protocol |
| GND | Ground Reference | Signal and power return; 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 - reduces full-device programming time to under 6.5 seconds, accelerating firmware revision cycles |
| Integrated Product ID Code | Manufacturer ID = 0x1E, Device ID = 0x0D - enables auto-detection and voltage/algorithm validation in production programmers |
| Two-Line Control Architecture | Separate CE and OE inputs - allows flexible bus arbitration and eliminates output contention during partial decode |
| High-Reliability CMOS Process | 200 mA latchup immunity - prevents destructive current paths during transient overvoltage events on address/data lines |
| JEDEC-Standard Packaging | PDIP, PLCC, SOIC, TSOP options - ensures drop-in replacement across form factors without redesigning socket or footprint |
Applications
| Industrial PLC Firmware Storage | Legacy Medical Instrument Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic and I/O mapping in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Non-volatile firmware repository accessed during cold start and watchdog reset recovery. Use Value: 90 ns access time eliminates CPU wait states on 80C31-based control engines, maintaining deterministic scan cycle timing. |
Use Scenario: Holding calibration constants and safety-critical boot routines in FDA-cleared patient monitors. IC Role / Device Role / Timing Role: Immutable startup code source ensuring verified execution path prior to RAM initialization. Use Value: One-time programmability prevents accidental overwrite during field service, meeting IEC 62304 software safety requirements. |
| Automotive Engine Control Module (ECM) | Avionics Display Subsystem BIOS |
Use Scenario: Storing ignition timing maps and sensor compensation tables in Tier-1 engine management units. IC Role / Device Role / Timing Role: Read-only lookup table provider interfaced directly to 16-bit Motorola 68HC11 derivatives. Use Value: -40°C to +85°C qualification and 2,000V ESD rating ensure reliability in under-hood vibration and EMI environments. |
Use Scenario: Hosting display initialization firmware and font glyphs in certified cockpit multifunction displays. IC Role / Device Role / Timing Role: Trusted boot image store accessed by ARM7TDMI host prior to DRAM training. Use Value: Rapid™ programming enables fast rework of display firmware revisions during avionics DO-254 hardware verification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C512-90PI | No integrated Product ID code; lacks Manufacturer/Device ID byte support | Requires manual programmer setup; unsuitable for automated high-volume programming lines | Select AT27C512R-90PI when using modern gang programmers with auto-ID detection |
| MX27C512-90PC | Same 64K×8 OTP structure but rated for 5V ±5% only; no automotive temp grade | Limited to commercial temperature range (0°C to 70°C); not qualified for industrial thermal cycling | Choose AT27C512R-90PI for designs requiring extended temperature operation or tighter supply tolerance |
Compared with AT27C512-90PI and MX27C512-90PC, the AT27C512R-90PI uniquely combines rapid programming, auto-ID capability, and industrial temperature support - making it the preferred choice for production environments requiring traceable, repeatable firmware programming and long-term thermal stability.
Availability
AT27C512R-90PI is available at Aetrix Electronics and suitable for industrial control, legacy medical instrumentation, and automotive engine management applications requiring stable component supply, long-lifecycle availability, and consistent parametric performance across production lots.
Supply support for AT27C512R-90PI 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 product continuity, documentation, and support for the AT27C512R family.
The AT27C512R belongs to Atmel's legacy OTP EPROM product line, designed specifically for cost-sensitive, high-reliability firmware storage in 8-bit and 16-bit microcontroller-based systems where reprogrammability is unnecessary.
FAQ
What is the maximum allowed VPP voltage during programming of the AT27C512R-90PI?
The AT27C512R-90PI requires OE/VPP = 13.0 V ± 0.25 V during programming, as specified in the DC Programming Characteristics table. Exceeding 13.25 V risks oxide breakdown in the floating-gate transistor array, while voltages below 12.75 V may cause incomplete fuse-link programming and subsequent read failures. Always verify VPP stability with a calibrated bench supply before initiating the Rapid™ algorithm on any AT27C512R-90PI unit.
Can the AT27C512R-90PI operate reliably at 5.5V supply voltage?
Yes - the AT27C512R-90PI is fully specified for VCC = 5V ±10%, meaning it supports 4.5V to 5.5V operation in both Read and Standby modes. All AC and DC parameters, including tACC ≤90 ns and ICC ≤20 mA, are guaranteed across this full range. However, programming requires VCC = 6.5V ±0.25V, so 5.5V is insufficient for write operations.
Does the AT27C512R-90PI support automatic identification in programming equipment?
Yes - the AT27C512R-90PI includes an Integrated Product Identification Code that returns Manufacturer ID = 0x1E and Device ID = 0x0D when A9 is driven to 12.0V and A0 is toggled. This feature is explicitly supported by industry-standard programmers (e.g., BP Microsystems, Xeltek) and eliminates manual part selection errors during high-volume firmware loading of AT27C512R-90PI devices.
What decoupling capacitance is required for stable operation of the AT27C512R-90PI?
The AT27C512R-90PI requires a minimum 0.1 µF ceramic capacitor placed between VCC and GND, mounted as close as possible to the device pins. This is mandatory to suppress transient excursions during CE switching, as documented in the System Considerations section. For boards with multiple AT27C512R-90PI units, add a 4.7 µF bulk electrolytic capacitor near the power entry point to maintain rail stability.
Is the AT27C512R-90PI pin-compatible with the AT27C512R-70PI?
Yes - both AT27C512R-90PI and AT27C512R-70PI use identical 28-lead PDIP packaging and share identical pin functions, electrical interfaces, and memory organization. The only difference is speed grade: the -90PI guarantees tACC ≤90 ns, while the -70PI guarantees tACC ≤70 ns. They are functionally interchangeable in systems where 90 ns access meets timing budget requirements.
AT27C512R-90PI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 28-DIP (0.600", 15.24mm)
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- 28-PDIP
AT27C512R-90PI FAQ
1.How can I place an order for AT27C512R-90PI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C512R-90PI 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-90PI reliable?
The price and inventory of AT27C512R-90PI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C512R-90PI is usually 5 days.
3.What payment methods are accepted for AT27C512R-90PI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C512R-90PI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C512R-90PI?
AT27C512R-90PI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C512R-90PI 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-90PI?
For technical support, including AT27C512R-90PI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C512R-90PI requirements.
6.How does Aetrix verify that AT27C512R-90PI is sourced from the original manufacturer or authorized distributors?
All AT27C512R-90PI 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-90PI meets industry standards.
7.What is the process for return or replacement of AT27C512R-90PI?
All AT27C512R-90PI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C512R-90PI, 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-90PI part is unused and in its original packaging.
Return procedure for AT27C512R-90PI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT27C512R-90PI Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
