My Inquiry
My Account
Microchip Technology AT27C512R-12PI
- Part No.:
- AT27C512R-12PI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
AT27C512R-12PI.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,562
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT27C512R-12PI from Microchip Technology (formerly Atmel) is a 512 Kbit (64K × 8) one-time programmable EPROM used for firmware storage in embedded microprocessor systems. It delivers 120 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 prevention in industrial controller boot memory applications.
For engineers reviewing the AT27C512R-12PI datasheet, AT27C512R-12PI pinout, AT27C512R-12PI application, or AT27C512R-12PI equivalent, this page provides verified technical context, JEDEC-standard package mapping, Rapid™ programming timing, integrated product identification code behavior, and industrial-temperature OTP EPROM selection guidance.
Technical Context
The AT27C512R-12PI implements a CMOS-based OTP EPROM architecture with two independent enable controls: Chip Enable (CE) for device selection and OE/VPP for output gating or programming voltage input. Its address decoding supports full 16-bit A0–A15 access to all 64K bytes without wait states at ≤5 MHz system clock speeds.
During programming, OE/VPP accepts 13.0 V ±0.25 V while VCC is raised to 6.5 V ±0.25 V; the Rapid™ algorithm applies 100 µs CE pulses per byte with up to 10 retries per failed location. Product identification uses A9 = 12.0 V and A0 toggling to select manufacturer (0x1E) or device code (0x0D) bytes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 524,288 bits (64K × 8), sufficient for full microcontroller boot code or configuration tables |
| Read Access Time | 120 ns max - supports direct interface to 80C51, Z80, and 68K-family processors without wait-state insertion |
| Supply Voltage | 5 V ±10% - compatible with standard TTL/CMOS logic rails; no auxiliary voltage required in read mode |
| Standby Current | ≤100 µA - enables low-power retention in battery-backed or energy-constrained industrial modules |
| Active Current | ≤20 mA at 5 MHz - limits thermal load and PCB trace sizing requirements in dense embedded designs |
| ESD Protection | 2,000 V HBM - meets IEC 61000-4-2 Level 2 for handling robustness in manufacturing and field service |
| Latchup Immunity | 200 mA - prevents destructive latchup during transient overvoltage events on address/data lines |
Pinout & Package
AT27C512R-12PI is supplied in a 28-lead 0.600" wide plastic DIP (PDIP) package per JEDEC MS-011 AB, with 0.3" row spacing and through-hole mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit binary address bus; fully decoded to select one of 64K bytes; TTL/CMOS compatible thresholds |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus in read mode; high-impedance when CE or OE inactive; VOL ≤0.4 V @ 2.1 mA |
| CE | Chip Enable | Active-low device select; must be stable before address setup; controls power state transition between active/standby |
| OE/VPP | Output Enable / Programming Voltage | Active-low output gate in read mode; supplies 13 V programming voltage during Rapid™ algorithm execution |
| GND | Ground Reference | Signal and power return; requires local 0.1 µF ceramic decoupling per device per datasheet Section 2 |
| VCC | Power Supply | +5 V ±10% main supply; must be applied simultaneously with or before OE/VPP; bulk 4.7 µF capacitor recommended for arrays |
| NC | No Connect | Pins 12 and 26 in PDIP are unconnected; no internal bonding; must remain floating or grounded per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time with auto-retry up to 10 pulses per byte ensures production line throughput and yield control |
| Integrated Product Identification Code | Electronic ID (0x1E/0x0D) accessible via A9=12 V and A0 toggle enables automated programmer validation and BOM traceability |
| Two-Line Control Architecture | Independent CE and OE/VPP pins allow flexible bus arbitration-OE can float outputs while CE remains asserted for partial decode schemes |
| Industrial Temperature Range | -40°C to +85°C operation validated across full speed grade (-12 suffix), supporting deployment in motor drives and PLC backplanes |
| JEDEC Standard Packaging | 28P6 PDIP footprint ensures drop-in compatibility with legacy EPROM sockets and rework-friendly through-hole assembly |
Applications
| Industrial PLC Firmware Storage | Legacy Microcontroller Boot ROM |
|---|---|
|
Use Scenario: Storing fixed ladder logic interpreter and I/O mapping tables in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile boot memory mapped to CPU address space; accessed at power-up with deterministic 120 ns latency. Use Value: Eliminates reliance on external EEPROM or Flash requiring initialization routines; guarantees first-instruction fetch within 120 ns of address assertion. |
Use Scenario: Providing immutable startup code for Z80- or 8051-based instrumentation front-ends where firmware updates are rare. IC Role / Device Role / Timing Role: Read-only instruction store executing directly from address bus; CE tied to reset deassertion sequence. Use Value: Avoids wear-out mechanisms of Flash; maintains bit-level reliability over 20+ year deployments in calibrated test equipment. |
| Automotive ECU Configuration ROM | Medical Device Calibration Data |
|
Use Scenario: Holding vehicle-specific CAN message routing tables and sensor scaling coefficients in engine control units. IC Role / Device Role / Timing Role: Static configuration memory accessed during cold start; powered only during boot phase to minimize quiescent draw. Use Value: Meets AEC-Q100 stress requirements via 200 mA latchup immunity and -40°C to +125°C automotive-grade variants (e.g., -12PA). |
Use Scenario: Storing factory-calibrated ADC offset/gain coefficients and safety-critical lookup tables in portable ultrasound units. IC Role / Device Role / Timing Role: Tamper-proof reference data source; read once at power-on and cached in RAM for runtime use. Use Value: Provides permanent, unalterable calibration data immune to radiation-induced bit flips or firmware corruption events. |
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 AMD's version uses 12.5 V VPP and lacks integrated ID code | Requires external ID verification; compatible in PDIP-28 socket but needs adjusted programmer voltage profiles | Select AM27C512-12DC only if existing programming infrastructure is AMD-optimized and ID code is unused |
| MX27C512-12PC | 120 ns access, identical pinout and DC specs, but Macronix specifies 10 µA max standby vs. 100 µA for AT27C512R-12PI | Better suited for ultra-low-quiescent systems; same industrial temp range but tighter standby spec may reduce margin in noisy environments | Prefer MX27C512-12PC when <20 µA standby is mandatory; verify noise immunity with local decoupling per datasheet Figure 2 |
Compared with AM27C512-12DC and MX27C512-12PC, the AT27C512R-12PI uniquely integrates programmable identification bytes and guarantees 2,000 V ESD protection-critical for field-serviceable industrial hardware where handling robustness and automated programming validation are design requirements.
Availability
AT27C512R-12PI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy microcontroller boot ROM, and automotive ECU configuration ROM requiring stable component supply across extended lifecycle programs.
Supply support for AT27C512R-12PI 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 the AT27C512R series.
The AT27C512R product line was designed for reliable, low-power, one-time programmable firmware storage in industrial, automotive, and medical systems where data integrity and long-term bit stability are non-negotiable.
FAQ
What is the maximum operating temperature range for AT27C512R-12PI?
The AT27C512R-12PI is rated for industrial temperature operation from -40°C to +85°C, as confirmed by its ordering code suffix "I" and validated in the DC Operating Conditions table on page 4 of the official datasheet. This range supports deployment in motor control cabinets, factory automation panels, and outdoor telecom enclosures without derating.
Does AT27C512R-12PI require a programming voltage during normal read operation?
No, AT27C512R-12PI operates on a single 5 V ±10% supply during read mode. The OE/VPP pin functions solely as Output Enable (active-low) in read mode. Programming voltage (13.0 V ±0.25 V) is applied only during the Rapid™ programming cycle and is not present during system runtime.
Can AT27C512R-12PI be used as a direct replacement for AT27C512-12PI?
Yes, AT27C512R-12PI is the enhanced revision of AT27C512-12PI with identical pinout, timing, and electrical specifications. The "R" suffix denotes improved process yield and added integrated product identification code-no hardware or firmware changes are needed for migration.
What decoupling capacitance is required for stable AT27C512R-12PI operation?
Per Section 2 of the AT27C512R datasheet, each AT27C512R-12PI requires a 0.1 µF high-frequency ceramic capacitor placed between VCC and GND as close to the device as possible. For boards with multiple EPROMs, add a 4.7 µF bulk electrolytic capacitor near the array's power entry point.
How is the Integrated Product Identification Code accessed on AT27C512R-12PI?
The AT27C512R-12PI ID code is read by holding all address lines A1–A15 low, applying 12.0 V ±0.5 V to A9 (VID), and toggling A0: low selects the Manufacturer ID byte (0x1E), high selects the Device Code byte (0x0D). This occurs only when CE and OE/VPP are both low.
AT27C512R-12PI 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:
- 120 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-12PI FAQ
1.How can I place an order for AT27C512R-12PI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C512R-12PI 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-12PI reliable?
The price and inventory of AT27C512R-12PI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C512R-12PI is usually 5 days.
3.What payment methods are accepted for AT27C512R-12PI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C512R-12PI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C512R-12PI?
AT27C512R-12PI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C512R-12PI 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-12PI?
For technical support, including AT27C512R-12PI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C512R-12PI requirements.
6.How does Aetrix verify that AT27C512R-12PI is sourced from the original manufacturer or authorized distributors?
All AT27C512R-12PI 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-12PI meets industry standards.
7.What is the process for return or replacement of AT27C512R-12PI?
All AT27C512R-12PI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C512R-12PI, 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-12PI part is unused and in its original packaging.
Return procedure for AT27C512R-12PI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT27C512R-12PI 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…
