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Microchip Technology AT27C512R-70JC
- Part No.:
- AT27C512R-70JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT27C512R-70JC.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,506
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Product details
Overview
AT27C512R-70JC from Microchip Technology (formerly Atmel) is a 64K × 8-bit one-time programmable EPROM (OTP EPROM) with 45 ns read access time, 5V ±10% supply, and JEDEC-standard 28-lead 600-mil PDIP package. It delivers fast, low-power nonvolatile storage for firmware boot code in microprocessor-based systems requiring deterministic timing and no write endurance constraints.
For engineers reviewing the AT27C512R-70JC datasheet, AT27C512R-70JC pinout, AT27C512R-70JC application, or AT27C512R-70JC equivalent, key selection criteria include read speed grade (-70 = 70 ns max tACC), industrial temperature range (-40°C to +85°C), CMOS/TTL compatibility, Rapid™ programming algorithm (100 µs/byte), and OTP reliability for fixed firmware images.
Technical Context
The AT27C512R-70JC implements a two-line control architecture using Chip Enable (CE) and Output Enable/VPP (OE/VPP) to manage bus contention and support both read and programming modes. Its internal address decoder accepts A0–A15 for full 64K-byte addressing, while outputs O0–O7 provide TTL/CMOS-compatible data with VOH ≥ 2.4 V and VOL ≤ 0.4 V under load.
Programming requires VCC = 6.5 V and OE/VPP = 13.0 V with 100 µs CE pulses per byte; verification loops ensure bit-level integrity. The device integrates a manufacturer ID (0x1E) and device code (0x0D) accessible via A9 high-voltage mode (11.5–12.5 V) and A0 toggling, enabling automated programmer identification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 524,288 bits (64K × 8), sufficient for full boot ROM or configuration tables in 8-bit/16-bit microcontrollers |
| Read Access Time | 70 ns max (tACC), enabling direct interface to 10–14 MHz microprocessors without wait states |
| Supply Voltage | 5 V ±10%, compatible with legacy 5V logic families and eliminating need for level shifters |
| Active Current | 20 mA max at 5 MHz, supporting low-power embedded operation with minimal thermal impact |
| Standby Current | 100 µA max (CMOS mode), critical for battery-backed or energy-sensitive systems during idle periods |
| ESD Protection | 2,000 V HBM, ensuring robustness during handling and board assembly in industrial environments |
| Latchup Immunity | 200 mA, preventing destructive latchup events under transient overvoltage conditions |
Pinout & Package
AT27C512R-70JC is supplied in a 28-lead, 0.600-inch wide plastic dual in-line package (PDIP), JEDEC MS-011 AB compliant, with 0.3 inch row spacing and through-hole mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus accepting full 64K memory map; driven by MPU address lines with TTL/CMOS thresholds |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus (output only); tri-stated when CE or OE high, compatible with 5V microcontroller data buses |
| CE | Chip Enable | Active-low chip select; enables internal circuitry and output drivers only when low; controls power state transition |
| OE/VPP | Output Enable / Programming Voltage | Low during read to enable outputs; raised to 13.0 V during programming to activate internal high-voltage circuitry |
| VCC | Power Supply | +5 V ±10% main supply; must be applied simultaneously with or before OE/VPP to prevent latchup |
| GND | Ground Reference | Signal and power return; requires local 0.1 µF ceramic decoupling capacitor per device |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time with auto-verification loop, reducing production burn-in cycle time by >5× vs. legacy EPROMs |
| Integrated Product Identification Code | Manufacturer ID (0x1E) and Device Code (0x0D) readable via A9 high-voltage mode, enabling automatic algorithm selection in universal programmers |
| Two-Line Control Architecture | Independent CE and OE/VPP pins eliminate bus contention risks and simplify timing design in multi-device memory subsystems |
| High-Reliability CMOS Process | 2,000 V ESD protection and 200 mA latchup immunity meet industrial-grade reliability requirements for factory automation and test equipment |
| Temperature Range Support | Industrial grade (-40°C to +85°C) ensures stable operation across extended ambient conditions without derating |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic firmware and I/O mapping tables in programmable logic controllers deployed in factory-floor environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Nonvolatile boot memory providing deterministic 70 ns read access to initialize CPU and peripherals at power-up without external wait-state generation. Use Value: Eliminates reliance on slower serial EEPROM or flash, ensuring sub-100 ns instruction fetch latency critical for real-time scan-cycle timing. | Use Scenario: Holding immutable BIOS or bootloader code in legacy 8051, Z80, or 68K-based instrumentation systems where field updates are unnecessary and data retention >20 years is required. IC Role / Device Role / Timing Role: OTP EPROM serving as primary program memory with pin-compatible drop-in replacement for older 27C512 variants in existing PCB layouts. Use Value: Guarantees bit-perfect firmware replication across production batches with zero risk of accidental reprogramming or corruption. |
| Automotive Diagnostic Module Memory | Test Equipment Configuration Storage |
Use Scenario: Storing calibration constants and diagnostic protocol stacks in OBD-II modules operating in under-hood automotive environments (-40°C to +125°C variant available). IC Role / Device Role / Timing Role: Read-only memory holding safety-critical static data accessed during vehicle startup and runtime diagnostics. Use Value: Industrial-grade version (AT27C512R-70JI) meets AEC-Q100 stress testing requirements for automotive electronics without additional qualification overhead. | Use Scenario: Retaining instrument-specific calibration coefficients, test sequence definitions, and user interface strings in benchtop multimeters and signal generators. IC Role / Device Role / Timing Role: Firmware storage element interfaced directly to microcontroller address/data bus with no software abstraction layer. Use Value: Enables rapid firmware revision control via physical device replacement-no firmware update infrastructure needed for factory calibration changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C512R-70PC | Same die, identical specs, but in 28-lead SOIC (28R) package instead of PDIP | Requires PCB layout change for surface-mount assembly; better for space-constrained designs | Select for modern SMT production; verify footprint compatibility and thermal profile for reflow soldering |
| AT27C512R-70JI | Same die and speed grade, rated for -40°C to +85°C industrial range (vs. commercial 0°C to +70°C for -70JC) | Validated for wider ambient temperature operation; suitable for uncontrolled environment deployments | Select when operating temperature exceeds 70°C ambient or when long-term reliability under thermal cycling is critical |
Compared with AT27C512R-70JC, the -70PC offers identical functionality in a smaller SOIC package for density-optimized boards, while the -70JI extends operational temperature range for harsher environments-neither is pin-compatible without PCB revision, but all share identical pinout, timing, and programming behavior.
Availability
AT27C512R-70JC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded boot ROM, and test equipment configuration storage requiring stable component supply, long-lifecycle availability, and guaranteed OTP data integrity.
Supply support for AT27C512R-70JC 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 support, documentation, and manufacturing continuity for the AT27C512R family.
The AT27C512R series was designed as a high-reliability, low-power OTP EPROM for fixed-firmware applications in industrial control, instrumentation, and legacy computing systems where data immutability and deterministic timing are essential.
FAQ
What is the maximum read access time specified for the AT27C512R-70JC?
The AT27C512R-70JC has a maximum address-to-output delay (tACC) of 70 ns under standard read conditions (CE = OE = VIL, VCC = 5 V ±10%, TA = -40°C to +85°C). This value is guaranteed across the full industrial temperature range and defines the worst-case timing margin for interfacing with microprocessors or FPGAs.
Does the AT27C512R-70JC support in-system programming?
No, the AT27C512R-70JC does not support in-system programming. It is a one-time programmable EPROM requiring UV-erasable predecessors' socket-based programming with 13.0 V on OE/VPP and 6.5 V on VCC. Programming must occur in a dedicated EPROM programmer prior to system integration; no field reprogramming capability exists.
What decoupling capacitors are required for stable operation of the AT27C512R-70JC?
The AT27C512R-70JC requires a 0.1 µF high-frequency ceramic capacitor placed between VCC and GND as close to the device pins as possible. For systems with multiple EPROMs, a 4.7 µF bulk electrolytic capacitor should also be added near the power entry point to suppress low-frequency supply ripple and maintain voltage stability during active read cycles.
Is the AT27C512R-70JC pin-compatible with earlier Atmel 27C512 variants?
Yes, the AT27C512R-70JC maintains full pin-to-pin compatibility with legacy Atmel 27C512 and 27C512-10/12/15 variants in the same 28-lead PDIP package. Signal names, pin positions, DC/AC timing behavior, and programming voltage requirements are identical, enabling drop-in replacement in existing designs without layout modification.
How is the manufacturer and device identification code accessed on the AT27C512R-70JC?
The AT27C512R-70JC provides an Integrated Product Identification Code: set A9 to 11.5–12.5 V (VID), hold A1–A15 low, then toggle A0 between VIL (for Manufacturer ID = 0x1E) and VIH (for Device Code = 0x0D). Outputs O0–O7 reflect the selected 8-bit code during this mode, used by programmers to auto-detect device type and apply correct algorithms.
AT27C512R-70JC 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:
- 70 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-70JC FAQ
1.How can I place an order for AT27C512R-70JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C512R-70JC 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-70JC reliable?
The price and inventory of AT27C512R-70JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C512R-70JC is usually 5 days.
3.What payment methods are accepted for AT27C512R-70JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C512R-70JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C512R-70JC?
AT27C512R-70JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C512R-70JC 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-70JC?
For technical support, including AT27C512R-70JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C512R-70JC requirements.
6.How does Aetrix verify that AT27C512R-70JC is sourced from the original manufacturer or authorized distributors?
All AT27C512R-70JC 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-70JC meets industry standards.
7.What is the process for return or replacement of AT27C512R-70JC?
All AT27C512R-70JC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C512R-70JC, 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-70JC part is unused and in its original packaging.
Return procedure for AT27C512R-70JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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