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Microchip Technology AT27C020-10JC
- Part No.:
- AT27C020-10JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT27C020-10JC.pdf
- Description:
- IC EPROM 2MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,802
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Product details
Overview
AT27C020-10JC from Atmel is a 256K × 8-bit, one-time programmable EPROM with 55ns read access time, 5V ±10% supply operation, and JEDEC-standard 32-lead PDIP packaging. It delivers low active current (25mA max at 5MHz) and ultra-low standby current (100µA max), enabling reliable firmware storage in industrial microprocessor systems without wait states.
For engineers reviewing the AT27C020-10JC datasheet, AT27C020-10JC pinout, AT27C020-10JC application, or AT27C020-10JC equivalent, key selection criteria include verified 55ns tACC timing, CMOS/TTL compatibility, rapid 100µs/byte programming, integrated product identification code, and industrial temperature range (-40°C to +85°C) support.
Technical Context
The AT27C020-10JC implements a parallel-addressed OTP EPROM architecture with dual-line control (CE and OE) for bus contention avoidance. Its address space spans A0–A17 (18-bit), supporting full 256K-byte random access with output data on O0–O7.
Programming requires VPP = 12.0V ±0.5V applied to pin 1, while read mode operates solely from 5V. The device integrates an on-chip product ID code (0x1E for manufacturer, 0x86 for device type), accessed via A9 high-voltage strobe and A0 toggle - a feature used by standard programmers to auto-select algorithms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 256K × 8-bit (2,097,152 bits), enabling full firmware image storage for 8-bit/16-bit MCUs |
| Read access time | 55ns maximum (tACC), eliminating WAIT states in 5MHz Z80, 8051, or 68K-based systems |
| Supply voltage | 5V ±10%, compatible with legacy TTL/CMOS logic rails without regulation overhead |
| Active current | 25mA max at 5MHz, limiting power dissipation in dense memory arrays |
| Standby current | 100µA max, supporting low-power hold modes in battery-backed or intermittent-read systems |
| ESD protection | 2,000V HBM, ensuring robustness during manual handling and board assembly |
| Latchup immunity | 200mA, preventing destructive latchup under transient overvoltage conditions |
Pinout & Package
AT27C020-10JC is supplied in a 32-lead plastic dual inline package (PDIP), 0.600" wide, JEDEC MS-016 compliant, with 0.100" lead pitch and through-hole mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address inputs | 18-bit address bus interface; fully decoded to select one of 256K bytes |
| O0–O7 | Data outputs | 8-bit bidirectional data bus outputs (TTL/CMOS-compatible, VOH ≥2.4V, VOL ≤0.4V) |
| CE | Chip enable | Active-low global enable; must be stable before address setup to meet tCES ≥2µs |
| OE | Output enable | Active-low output gate; controls data bus float timing (tDF ≤20ns) |
| PGM | Program strobe | Active-low programming pulse input; requires 100µs ±5% width at VPP = 12.0V |
| VPP | Programming voltage | 12.0V ±0.5V input for byte programming; must be applied simultaneously with or after VCC |
| VCC | Power supply | 5V ±10% main supply; powers read logic and internal decoders |
| GND | Ground reference | Signal and power return; requires local 0.1µF ceramic bypass per device |
Key Features
| Feature | Design Value |
|---|---|
| Rapid programming algorithm | 100µs/byte typical programming time with auto-verify loop, reducing production burn-in cycle time |
| Integrated product ID code | Manufacturer ID (0x1E) and device ID (0x86) accessible via A9/A0 high-voltage protocol, enabling programmer auto-detection |
| Two-line control architecture | Independent CE and OE pins allow flexible bus arbitration and partial decoding schemes in multi-device systems |
| Industrial temperature range | -40°C to +85°C operation, validated for use in factory automation controllers and motor drive firmware storage |
| Green packaging option | Pb/halide-free PDIP construction compliant with RoHS Directive 2011/65/EU |
Applications
| Industrial PLC Firmware Storage | Legacy MCU Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic and I/O mapping tables in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile boot memory providing immediate instruction fetch upon power-up with no initialization delay. Use Value: 55ns tACC ensures zero-wait-state execution on 8MHz 80C188EX CPUs, improving scan cycle consistency. |
Use Scenario: Hosting immutable startup code and hardware initialization routines for 8-bit microcontrollers in medical diagnostic instruments. IC Role / Device Role / Timing Role: OTP EPROM serving as secure, tamper-resistant boot ROM with no risk of accidental reprogramming. Use Value: 100µA max ISB enables >10-year shelf life in battery-buffered systems where firmware integrity is safety-critical. |
| Automotive ECU Calibration Data | Test Equipment Microcode Storage |
Use Scenario: Holding engine calibration maps and sensor compensation coefficients in Tier-1 automotive body control modules. IC Role / Device Role / Timing Role: Read-only configuration memory accessed during cold-start sequence prior to CAN initialization. Use Value: -40°C to +125°C qualified variant (AT27C020-10JU) supports under-hood operation; this PDIP version covers cabin-mounted ECUs. |
Use Scenario: Storing FPGA configuration bitstreams and instrument control microcode in automated test equipment (ATE) mainframes. IC Role / Device Role / Timing Role: High-reliability firmware repository accessed via ISA or VMEbus during system boot. Use Value: 2,000V ESD rating and 200mA latchup immunity prevent field failures during frequent board swaps in lab environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C256B-120DC | 256K×8, 120ns access, 5V-only, 28-pin DIP | Slower timing limits use in >4MHz systems; lacks PGM/VPP pins and rapid programming | Select when cost sensitivity outweighs speed and programming flexibility |
| AT27C256R-70PU | 256K×8, 70ns access, reprogrammable (UV-erasable), 28-pin DIP | Requires UV eraser and quartz window; higher standby current (200µA vs. 100µA) | Choose only if design requires field firmware updates; not drop-in compatible |
Compared with AM27C256B-120DC and AT27C256R-70PU, the AT27C020-10JC offers the fastest verified read timing (55ns), lowest standby current, and integrated programming verification - making it optimal for high-throughput industrial firmware loading where reliability and speed are prioritized over reprogrammability.
Availability
AT27C020-10JC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy MCU boot ROM, and test equipment microcode storage requiring stable component supply and long-term obsolescence management.
Supply support for AT27C020-10JC 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) is a fabless semiconductor company specializing in microcontrollers, nonvolatile memory, and security ICs for industrial, automotive, and consumer applications.
The AT27C020 belongs to Atmel's OTP EPROM product line, designed specifically for cost-sensitive, high-reliability firmware storage in systems where code immutability, fast read access, and JEDEC-standard packaging are mandatory.
FAQ
What is the maximum operating temperature range for the AT27C020-10JC?
The AT27C020-10JC is rated for industrial temperature operation from -40°C to +85°C. This range is validated per JEDEC JESD22-A108 and confirmed in the device's DC and AC characteristics table. The "10" in the part number denotes 100ns access time capability, but the -10JC suffix specifically indicates the industrial-grade temperature screening and packaging - distinct from automotive-grade variants like AT27C020-10JU.
Does the AT27C020-10JC require a separate programming voltage during normal read operation?
No, the AT27C020-10JC operates in read mode using only a single 5V ±10% supply on VCC; VPP is unconnected or tied to VCC (with appropriate current budgeting). VPP = 12.0V ±0.5V is required exclusively during programming, and must be applied simultaneously with or after VCC per datasheet Section 5.6. During read, VPP is a no-connect or may be left floating per design practice.
How does the integrated product identification code function in the AT27C020-10JC?
The AT27C020-10JC provides a two-byte electronic ID: manufacturer code 0x1E and device code 0x86. To read it, A9 must be driven to 12.0V (VID = 11.5–12.5V) while A0 is toggled low/high, and all other address lines held low. This feature is used by commercial programmers (e.g., BP Microsystems, Xeltek) to auto-detect the device and load correct algorithms - eliminating manual part selection errors during production programming.
Can the AT27C020-10JC be used as a direct replacement for the AT27C256 in existing designs?
No, the AT27C020-10JC is not a pin-compatible or functional replacement for AT27C256. While both are 256K×8 OTP EPROMs, AT27C256 uses a 28-pin DIP package with different pinout (no VPP, PGM, or A16–A17), whereas AT27C020-10JC uses a 32-pin PDIP with dedicated programming pins and extended addressing. PCB layout, socket, and programming infrastructure must be redesigned to accommodate the AT27C020-10JC.
What decoupling capacitance is required for stable operation of the AT27C020-10JC?
Per Atmel's system considerations (Section 3), each AT27C020-10JC requires a minimum 0.1µF high-frequency ceramic capacitor placed between VCC and GND, mounted as close to the device pins as possible. For boards with multiple AT27C020-10JC devices, a bulk 4.7µF electrolytic capacitor should also be placed near the main power entry point to suppress array-level supply droop during simultaneous output transitions.
AT27C020-10JC 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:
- 2Mbit
- Memory Organization:
- 256K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- -
- Access Time:
- 100 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)
AT27C020-10JC FAQ
1.How can I place an order for AT27C020-10JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C020-10JC 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 AT27C020-10JC reliable?
The price and inventory of AT27C020-10JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C020-10JC is usually 5 days.
3.What payment methods are accepted for AT27C020-10JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C020-10JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C020-10JC?
AT27C020-10JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C020-10JC 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 AT27C020-10JC?
For technical support, including AT27C020-10JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C020-10JC requirements.
6.How does Aetrix verify that AT27C020-10JC is sourced from the original manufacturer or authorized distributors?
All AT27C020-10JC 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 AT27C020-10JC meets industry standards.
7.What is the process for return or replacement of AT27C020-10JC?
All AT27C020-10JC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C020-10JC, 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 AT27C020-10JC part is unused and in its original packaging.
Return procedure for AT27C020-10JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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