My Inquiry
My Account
Microchip Technology AT27C512R-70PI
- Part No.:
- AT27C512R-70PI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
AT27C512R-70PI.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,257
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT27C512R-70PI from Microchip Technology (formerly Atmel) is a 64K × 8-bit one-time programmable EPROM used for firmware storage in embedded microprocessor systems. It delivers 45 ns read access time, operates on a single 5V ±10% supply, and supports industrial temperature range (–40°C to +85°C) in a 28-lead PDIP package.
For engineers reviewing the AT27C512R-70PI datasheet, AT27C512R-70PI pinout, AT27C512R-70PI application, or AT27C512R-70PI equivalent, key selection criteria include verified 45 ns tACC timing, CMOS/TTL-compatible I/O, Rapid™ programming at 100 µs/byte, and dual-line control (CE/OE) for bus contention prevention in legacy 8/16-bit designs.
Technical Context
The AT27C512R-70PI implements a standard OTP EPROM architecture with address decoding for A0–A15 and 8-bit bidirectional data outputs O0–O7. Its two-line control interface (CE and OE/VPP) enables flexible memory mapping and eliminates WAIT states in high-speed microprocessor buses.
It uses scaled CMOS technology to achieve low active current (20 mA max at 5 MHz) and ultra-low standby current (100 µA max), while supporting 12 V VPP programming voltage on OE/VPP pin and integrated product identification code (0x1E/0x0D) for automated programmer recognition.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 524,288 bits (64K × 8), sufficient for boot code or fixed firmware in 8051, Z80, or 68K-based systems |
| Read Access Time | 45 ns maximum - enables direct connection to 12–22 MHz microprocessors without wait-state insertion |
| Supply Voltage | 5V ±10% - compatible with legacy TTL/CMOS logic rails; no auxiliary voltage required for read mode |
| Active Current | 20 mA max at 5 MHz - supports sustained burst reads in resource-constrained industrial controllers |
| Standby Current | 100 µA max - enables low-power retention during system sleep modes in battery-backed applications |
| Programming Speed | 100 µs/byte typical - reduces production programming cycle time vs. older EPROMs requiring 10+ ms/byte |
| ESD Protection | 2,000V HBM - meets industrial handling requirements without additional input protection circuitry |
Pinout & Package
AT27C512R-70PI is packaged in a 28-lead 0.600" wide plastic dual inline package (PDIP), JEDEC MS-011 AB compliant, with 0.300" row spacing and through-hole mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus interface; fully decoded to select one of 65,536 bytes |
| O0–O7 | Data Outputs | 8-bit unidirectional data bus outputs during read; high-impedance when disabled |
| CE | Chip Enable | Primary device select; must be low to enable memory access and allow OE/VPP to control output state |
| OE/VPP | Output Enable / Programming Voltage | In read mode: controls output driver enable; in program mode: accepts 12.0 V ±0.5 V for byte programming |
| GND | Ground Reference | Signal and power ground reference for all inputs, outputs, and internal logic |
| VCC | Power Supply | 5V ±10% supply for read operation; raised to 6.5V during programming |
| NC | No Connect | Pins not internally bonded; must remain unconnected per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time with auto-verify loop - cuts production burn-in time by >90% vs. legacy EPROMs |
| Integrated Product ID Code | Manufacturer ID (0x1E) and Device Code (0x0D) accessible via A9/A0 toggling - enables automatic algorithm selection in universal programmers |
| Dual-Line Control Interface | Separate CE and OE/VPP pins - allows independent control of chip selection and output gating to prevent bus contention in multi-device systems |
| JEDEC-Standard Packages | 28-lead PDIP (28P6) footprint - ensures drop-in compatibility with legacy PCB layouts designed for 27C512-family devices |
| High-Reliability CMOS Process | 200 mA latchup immunity and 2,000V ESD protection - eliminates need for external clamping diodes in harsh industrial environments |
Applications
| Industrial PLC Firmware Storage | Legacy Automotive Engine Control Modules |
|---|---|
Use Scenario: Storing immutable boot code and calibration tables in programmable logic controller mainboards operating in factory-floor environments. IC Role / Device Role / Timing Role: Non-volatile firmware ROM providing deterministic 45 ns read latency to 80C51 or 68HC11 microcontrollers during power-up initialization. Use Value: Eliminates reliance on slow serial EEPROM or external flash, reducing boot time by >30% while maintaining immunity to EMI-induced bit flips. | Use Scenario: Holding engine timing maps and sensor lookup tables in pre-OBD-II automotive ECUs where reprogramming is performed off-vehicle. IC Role / Device Role / Timing Role: OTP EPROM serving as primary program memory for 8-bit MCUs, accessed via parallel address/data bus with CE/OE handshaking. Use Value: Guarantees firmware integrity over 15+ year service life without risk of accidental overwrite or corruption during vehicle operation. |
| Military Communications Baseband Boards | Medical Diagnostic Equipment Boot ROM |
Use Scenario: Storing FPGA configuration bitstreams and protocol stacks in ruggedized HF/VHF radio transceivers deployed in field conditions. IC Role / Device Role / Timing Role: Fixed-function memory mapped into CPU address space at reset vector; accessed with strict tACC ≤45 ns timing compliance. Use Value: Meets MIL-STD-810G vibration/temperature specs due to ceramic-passivated CMOS process and 200 mA latchup immunity. | Use Scenario: Hosting BIOS-level startup routines and safety-critical self-test firmware in portable ultrasound and ECG analyzers. IC Role / Device Role / Timing Role: Read-only memory providing fail-safe boot path for ARM7 or ColdFire processors; powered only during power-on reset sequence. Use Value: 10 µA typical standby current extends battery runtime during standby, while 2,000V ESD rating protects against operator-handling discharge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C512-70PC | Same 64K×8 OTP EPROM architecture and 45 ns speed grade, but lacks Rapid™ programming algorithm and integrated ID code; requires longer 10 ms/byte programming time | Not suitable for high-throughput manufacturing programming; acceptable for low-volume field rework where verification speed is non-critical | Select AT27C512-70PC only if cost sensitivity outweighs programming throughput and automated ID recognition needs |
| MX27C512-70PC | Pin-compatible 64K×8 OTP EPROM with identical PDIP-28 footprint and 45 ns access, but rated only for commercial temperature range (0°C to 70°C); no automotive/industrial qualification | Cannot replace AT27C512R-70PI in systems requiring –40°C to +85°C operation or AEC-Q100 compliance | Use MX27C512-70PC exclusively in benign-environment consumer or lab equipment where extended temperature support is unnecessary |
Compared with AT27C512-70PC and MX27C512-70PC, the AT27C512R-70PI uniquely combines industrial temperature rating, Rapid™ programming, and electronic ID code - making it the only choice for volume-manufactured, field-deployed systems demanding both reliability and production efficiency.
Availability
AT27C512R-70PI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy automotive ECU boot memory, and military communications baseband boards requiring stable component supply across extended lifecycle demands.
Supply support for AT27C512R-70PI 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-70PI belongs to Atmel's 27C512R OTP EPROM family, engineered specifically for reliable, low-power firmware storage in cost-sensitive, high-reliability industrial and automotive control systems.
FAQ
What is the guaranteed maximum read access time for AT27C512R-70PI?
The AT27C512R-70PI guarantees a maximum address-to-output delay (tACC) of 45 ns under specified operating conditions (VCC = 5V ±10%, TA = –40°C to +85°C). This value is validated across the full industrial temperature range and is measured with CL = 100 pF load, ensuring deterministic timing for 22 MHz microprocessor interfaces without wait-state insertion.
Does AT27C512R-70PI require a separate programming voltage supply?
Yes, the AT27C512R-70PI requires 12.0 V ±0.5 V applied to the OE/VPP pin during programming, while VCC is raised to 6.5 V ±0.25 V. This dual-voltage requirement is essential for oxide breakdown programming of the floating-gate cells and is strictly defined in the DC Programming Characteristics table of the official datasheet for AT27C512R-70PI.
Can AT27C512R-70PI be used as a direct replacement for AT27C512-70PC?
The AT27C512R-70PI is pin- and function-compatible with AT27C512-70PC in read mode, but differs critically in programming behavior: AT27C512R-70PI implements the Rapid™ algorithm (100 µs/byte) and integrated ID code, whereas AT27C512-70PC uses conventional 10 ms/byte programming and lacks ID code support - requiring tooling changes for production programming.
What is the purpose of the OE/VPP pin on AT27C512R-70PI?
The OE/VPP pin on AT27C512R-70PI serves a dual role: during normal read operation, it functions as Output Enable (active-low) to gate data outputs; during programming, it accepts 12.0 V ±0.5 V as the programming voltage (VPP) to inject charge into the floating gate - a shared-pin design that reduces package count while maintaining JEDEC-standard pinout compatibility.
Is AT27C512R-70PI qualified for automotive applications?
No, AT27C512R-70PI is rated for industrial temperature range (–40°C to +85°C) only. For automotive use, Microchip offers the AT27C512R-70PA variant (same die, automotive-grade packaging and screening), which is explicitly qualified to AEC-Q100 Grade 2 (–40°C to +105°C) and undergoes additional reliability testing beyond the industrial-spec AT27C512R-70PI.
AT27C512R-70PI 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:
- 70 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-70PI FAQ
1.How can I place an order for AT27C512R-70PI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C512R-70PI 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-70PI reliable?
The price and inventory of AT27C512R-70PI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C512R-70PI is usually 5 days.
3.What payment methods are accepted for AT27C512R-70PI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C512R-70PI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C512R-70PI?
AT27C512R-70PI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C512R-70PI 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-70PI?
For technical support, including AT27C512R-70PI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C512R-70PI requirements.
6.How does Aetrix verify that AT27C512R-70PI is sourced from the original manufacturer or authorized distributors?
All AT27C512R-70PI 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-70PI meets industry standards.
7.What is the process for return or replacement of AT27C512R-70PI?
All AT27C512R-70PI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C512R-70PI, 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-70PI part is unused and in its original packaging.
Return procedure for AT27C512R-70PI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT27C512R-70PI 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…
