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Microchip Technology AT27C512R-45JC
- Part No.:
- AT27C512R-45JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT27C512R-45JC.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,420
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Product details
Overview
AT27C512R-45JC from Atmel is a 64K × 8-bit one-time programmable EPROM (OTP EPROM) with 45 ns read access time, 5V ±10% supply operation, and JEDEC-standard 28-lead 600-mil PDIP packaging. It delivers low-power CMOS performance (≤100 µA standby, ≤20 mA active at 5 MHz) for firmware storage in microprocessor-based embedded systems requiring deterministic timing and nonvolatile code retention.
For engineers reviewing the AT27C512R-45JC datasheet, AT27C512R-45JC pinout, AT27C512R-45JC application, or AT27C512R-45JC equivalent, key selection criteria include verified 45 ns tACC timing, VPP-enabled programming compatibility, dual-line CE/OE control architecture, and industrial temperature range (-40°C to +85°C) support per ordering code suffix.
Technical Context
The AT27C512R-45JC implements a CMOS OTP EPROM core with two-line control logic (CE and OE/VPP), enabling bus contention avoidance in shared-memory systems. Its address space spans A0–A15 (16-bit), supporting full 64K-byte random access without wait states.
Programming uses Rapid™ algorithm with 100 µs/byte typical pulse width at VCC = 6.5 V and OE/VPP = 13.0 V; product identification is accessed via A9 = 12.0 V and A0 toggling, returning manufacturer (0x1E) and device (0x0D) codes. Standby mode activates when CE = VIH, forcing outputs to high-impedance regardless of OE/VPP state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 524,288 bits (64K × 8), enabling full firmware image storage for 8-bit microcontrollers |
| Read Access Time (tACC) | 45 ns max - eliminates WAIT states on 5 MHz Z80, 8051, and 68K-based systems |
| Supply Voltage | 5V ±10% - compatible with standard TTL/CMOS logic rails without regulation overhead |
| Standby Current | 100 µA max - supports low-power hold modes in battery-backed or energy-constrained designs |
| Active Current | 20 mA max at 5 MHz - enables direct interfacing with legacy bus drivers without current limiting |
| ESD Protection | 2,000V HBM - ensures robustness during handling and PCB assembly in industrial environments |
| Latchup Immunity | 200 mA - prevents destructive latchup under transient overvoltage or ground bounce conditions |
Pinout & Package
AT27C512R-45JC is supplied in a 28-lead, 0.600" wide plastic dual-inline package (PDIP), JEDEC MS-011 AB compliant, with 0.100" lead pitch 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 64K bytes |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus outputs; CMOS/TTL-compatible voltage levels (VOH ≥2.4 V, VOL ≤0.4 V) |
| CE | Chip Enable | Primary device select; must be VIL for read or program operations; VIH forces high-Z outputs |
| OE/VPP | Output Enable / Programming Voltage | VIL enables output drivers during read; 12.0 V ±0.5 V applied for programming and ID code access |
| GND | Ground Reference | Signal and power return; requires local 0.1 µF ceramic decoupling per device |
| VCC | Power Supply | 5V ±10% main supply; must be applied simultaneously with or before OE/VPP |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical - reduces production programming time by >5× vs. legacy EPROMs |
| Integrated Product Identification Code | Manufacturer (0x1E) and device (0x0D) codes readable via A9=12 V and A0 toggle - enables automated programmer validation |
| Dual-Line Control (CE + OE/VPP) | Independent chip and output enable - eliminates bus contention in multi-device memory maps |
| Three Temperature Grades | Industrial (-40°C to +85°C) supported per -JI/-PI/-RI/-TI suffixes - validated for factory automation and motor control |
| JEDEC-Standard Packaging | 28P6 PDIP footprint - ensures drop-in replacement for legacy 27C512, 27C256, and 27C128 sockets |
Applications
| Industrial PLC Firmware Storage | Legacy Microcontroller Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic and I/O mapping tables in programmable logic controllers deployed in factory-floor environments with ambient temperatures up to 85°C. IC Role / Device Role / Timing Role: Nonvolatile boot-time code storage with deterministic 45 ns read latency, directly mapped to 8051 or Z80 address/data buses. Use Value: Eliminates reliance on slow serial EEPROM or external flash, ensuring sub-microsecond instruction fetch timing critical for real-time scan cycles. |
Use Scenario: Providing immutable startup code for 8-bit microcontrollers in medical diagnostic instruments where firmware integrity must survive power loss and ESD events. IC Role / Device Role / Timing Role: Primary ROM executing reset vector fetch and hardware initialization sequences prior to RAM or peripheral configuration. Use Value: 2,000V HBM ESD rating and 200 mA latchup immunity prevent corruption during clinical equipment servicing or transport. |
| Automotive Engine Control Module (ECM) | Test Equipment Firmware Repository |
Use Scenario: Holding calibration constants and fuel injection lookup tables in engine control units operating across -40°C to +125°C ambient ranges. IC Role / Device Role / Timing Role: Read-only configuration memory accessed synchronously with 68HC11 or similar MCU clock domains during runtime. Use Value: Verified industrial-grade timing (tACC = 45 ns) and extended temperature qualification ensure consistent timing margins across thermal transients. |
Use Scenario: Hosting self-test routines and calibration algorithms in automated test equipment used for semiconductor wafer probing and board-level functional verification. IC Role / Device Role / Timing Role: High-reliability firmware store accessed during power-on self-test (POST) and periodic recalibration sequences. Use Value: Rapid™ programming enables fast field updates of test firmware without rework; integrated ID codes prevent incorrect device loading during manufacturing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C512-45PC | No 'R' revision; lacks Rapid™ programming algorithm and integrated ID code; 150 µs/byte typical programming time | Same 64K × 8 organization and 45 ns read speed, but incompatible with ID-aware programmers | Select only if legacy programming infrastructure does not require Rapid™ or electronic ID features |
| MX27C512-45PC | Macronix second-source; identical pinout and AC specs, but no documented ID code or VPP-based programming verification sequence | Drop-in replacement for read functionality; unverified for Rapid™-mode programming or A9-based ID reads | Prefer for cost-sensitive read-only deployments where programming occurs off-line using vendor-specific tools |
Compared with AT27C512R-45JC, AT27C512-45PC omits Rapid™ programming and ID code, increasing production programming time; MX27C512-45PC offers pin-compatible read operation but lacks guaranteed compatibility with Atmel's A9/VPP identification protocol and rapid verify-reprogram loop.
Availability
AT27C512R-45JC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy microcontroller boot ROM, and automotive ECM calibration table retention requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AT27C512R-45JC 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
Atmel Corporation, now part of Microchip Technology, designed high-reliability nonvolatile memory and microcontroller solutions for industrial, automotive, and communications markets.
The AT27C512R belongs to Atmel's OTP EPROM product line, engineered specifically for firmware storage in resource-constrained embedded systems where deterministic timing, low power, and long-term data retention are mandatory.
FAQ
What is the maximum operating temperature range for the AT27C512R-45JC?
The AT27C512R-45JC is rated for industrial temperature operation from -40°C to +85°C, as confirmed by its ordering code suffix '-JI' (PLCC), '-PI' (PDIP), '-RI' (SOIC), or '-TI' (TSOP). This range is validated per DC and AC operating characteristics in the official Atmel datasheet Rev. 0015I–07/98, supporting deployment in factory automation and motor control environments where thermal stability is critical. The AT27C512R-45JC maintains full 45 ns tACC timing across this entire range.
Does the AT27C512R-45JC support in-system programming?
No, the AT27C512R-45JC does not support in-system programming. It is a one-time programmable (OTP) EPROM requiring external UV-erasable or dedicated EPROM programmers that apply 12.0 V ±0.5 V to the OE/VPP pin during programming. The AT27C512R-45JC lacks internal charge pumps or ISP circuitry; programming must occur in a socketed fixture with precise VCC = 6.5 V and OE/VPP = 13.0 V sequencing per the Rapid™ algorithm specification.
How is the Integrated Product Identification Code accessed on the AT27C512R-45JC?
The Integrated Product Identification Code on the AT27C512R-45JC is accessed by setting A9 to 12.0 V ±0.5 V (VID), holding A1–A15 low (VIL), and toggling A0 between VIL and VIH to select either the Manufacturer ID byte (0x1E) or Device Code byte (0x0D). This operation requires OE/VPP = VIL and CE = VIL while maintaining VCC = 5 V. The AT27C512R-45JC outputs the selected byte on O0–O7 within tACC after address stabilization.
What decoupling capacitance is required for stable operation of the AT27C512R-45JC?
Each AT27C512R-45JC requires a minimum 0.1 µF high-frequency ceramic capacitor connected between VCC and GND, placed as close to the device pins as possible. For systems with multiple AT27C512R-45JC devices or large EPROM arrays, a 4.7 µF bulk electrolytic capacitor must also be added between VCC and GND near the power entry point. These values are specified in the "System Considerations" section of the Atmel datasheet to suppress transient excursions during CE-driven standby-to-active transitions.
Is the AT27C512R-45JC pin-compatible with older 27C512 variants?
Yes, the AT27C512R-45JC is pin-compatible with industry-standard 27C512 EPROMs in the same package type (e.g., 28P6 PDIP), sharing identical pin functions (A0–A15, O0–O7, CE, OE/VPP, VCC, GND) and electrical interface (CMOS/TTL-compatible inputs/outputs). However, the AT27C512R-45JC introduces Rapid™ programming and ID code features not present in earlier 27C512 versions, so programming equipment must support these enhancements to utilize them fully.
AT27C512R-45JC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- 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:
- 45 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT27C512R-45JC FAQ
1.How can I place an order for AT27C512R-45JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C512R-45JC 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-45JC reliable?
The price and inventory of AT27C512R-45JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C512R-45JC is usually 5 days.
3.What payment methods are accepted for AT27C512R-45JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C512R-45JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C512R-45JC?
AT27C512R-45JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C512R-45JC 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-45JC?
For technical support, including AT27C512R-45JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C512R-45JC requirements.
6.How does Aetrix verify that AT27C512R-45JC is sourced from the original manufacturer or authorized distributors?
All AT27C512R-45JC 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-45JC meets industry standards.
7.What is the process for return or replacement of AT27C512R-45JC?
All AT27C512R-45JC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C512R-45JC, 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-45JC part is unused and in its original packaging.
Return procedure for AT27C512R-45JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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