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Microchip Technology AT27C020-15JI
- Part No.:
- AT27C020-15JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT27C020-15JI.pdf
- Description:
- IC EPROM 2MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,736
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Product details
Overview
AT27C020-15JI from Atmel is a 2-Mbit (256K × 8) one-time programmable EPROM designed for firmware storage in microprocessor systems. It delivers 150 ns read access time, operates from a single 5V ±10% supply, and supports industrial temperature range (–40°C to +85°C) in a 32-lead PLCC package. It enables high-speed, low-latency code execution without WAIT states in embedded controllers.
For engineers reviewing the AT27C020-15JI datasheet, AT27C020-15JI pinout, AT27C020-15JI application, or AT27C020-15JI equivalent, key selection considerations include OTP reliability, 5V-only read operation, rapid programming algorithm (100 µs/byte), JEDEC-standard PLCC compatibility, and industrial-grade ESD/latch-up immunity.
Technical Context
The AT27C020-15JI implements a two-line control architecture using CE and OE to manage bus contention and output enable timing. Its address space spans A0–A17 (18-bit), supporting full 256K-byte decoding with CMOS/TTL-compatible I/O levels (VIH = 2.0 V, VOL = 0.4 V @ 2.1 mA).
Programming requires VPP = 13.0 V ±0.25 V and VCC = 6.5 V ±0.25 V, with a verified 100 µs PGM pulse width and integrated product identification (Manufacturer ID = 0x1E, Device ID = 0x86). Standby current is specified at ≤100 µA, active current ≤25 mA at 5 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2,097,152 bits (256K × 8) - supports full firmware image storage for 8-bit microcontrollers without external memory expansion. |
| Read Access Time | 150 ns max - ensures compatibility with 6–7 MHz Z80, 8051, and 68K-based systems without wait-state insertion. |
| Supply Voltage | 5V ±10% - eliminates need for auxiliary voltage rails; compatible with standard logic power domains. |
| Operating Temperature | –40°C to +85°C - qualified for industrial control, motor drives, and factory automation environments. |
| Standby Current | ≤100 µA - enables low-power retention in battery-backed or energy-constrained systems during idle periods. |
| ESD Protection | 2,000V HBM - reduces risk of field failure during handling and PCB assembly in non-ESD-controlled facilities. |
| Latch-up Immunity | 200 mA - withstands transient overcurrent events on I/O or supply pins without destructive latch-up. |
Pinout & Package
AT27C020-15JI is packaged in a 32-lead Plastic J-Leaded Chip Carrier (PLCC), JEDEC MS-016 AE compliant, with 1.27 mm pitch and body size 18.5 × 18.5 mm. Pin 1 is marked by index notch and corner chamfer.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus interface; fully decodes 256K-byte space; TTL/CMOS compatible (VIL ≤ 0.8 V, VIH ≥ 2.0 V). |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus outputs; VOH ≥ 2.4 V @ –400 µA, VOL ≤ 0.4 V @ 2.1 mA - drives standard logic loads directly. |
| CE | Chip Enable | Active-low global chip select; controls device activation and standby entry; high-Z output when deasserted. |
| OE | Output Enable | Active-low output gate; enables data bus drivers independently of CE to support multiplexed bus arbitration. |
| PGM | Program Strobe | Active-low programming control signal; initiates 100 µs pulse programming cycle when VPP = 13 V applied. |
| VPP | Programming Voltage | 13.0 V ±0.25 V input for OTP programming; must be applied after VCC and removed before VCC per sequencing rules. |
| VCC | Power Supply | +5 V ±10% main supply; powers read mode (8 mA typical) and programming mode (40 mA max during PGM pulse). |
| GND | Ground Reference | Signal and power return; requires local 0.1 µF ceramic bypass capacitor per device per datasheet layout guidance. |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time - reduces production burn-in cycle time vs. legacy EPROMs requiring ms-level pulses. |
| Integrated Product ID Code | Manufacturer ID = 0x1E, Device ID = 0x86 - enables automated programmer recognition and algorithm selection without manual part setup. |
| Two-Line Control (CE/OE) | Independent chip and output enable - allows flexible bus sharing with other peripherals and eliminates contention during partial decode. |
| Industrial Temperature Range | –40°C to +85°C operation - validated for use in programmable logic controllers, HVAC controllers, and industrial HMIs. |
| JEDEC Standard Packages | 32J (PLCC) footprint - ensures drop-in replacement capability across Atmel's 27C020 family and compatibility with legacy PLCC sockets. |
Applications
| Industrial PLC Firmware Storage | Legacy Microcontroller Boot ROM |
|---|---|
|
Use Scenario: Storing ladder logic interpreter and I/O mapping tables in modular PLC backplanes operating continuously in factory environments. IC Role / Device Role / Timing Role: Non-volatile boot and runtime firmware store accessed via 8-bit parallel bus; provides deterministic 150 ns read latency for real-time scan cycles. Use Value: Eliminates reliance on slow serial EEPROM or unreliable battery-backed SRAM; supports field firmware updates via dedicated programming station. |
Use Scenario: Hosting boot code and interrupt vectors for Z80- or 8051-based instrumentation systems deployed in test equipment and medical analyzers. IC Role / Device Role / Timing Role: Primary read-only memory mapped at reset vector address; interfaces directly to CPU address/data bus without glue logic. Use Value: Guarantees code integrity over 10+ year service life; avoids reprogramming risks associated with flash wear-out or configuration corruption. |
| Automotive Engine Control Module (ECM) Calibration Data | Point-of-Sale Terminal BIOS Storage |
|
Use Scenario: Holding fuel map calibration constants and emission control parameters in pre-OBD-II engine management units certified for –40°C to +125°C operation. IC Role / Device Role / Timing Role: OTP configuration store accessed during cold start initialization; retains data without power or backup battery. Use Value: Prevents unauthorized modification of safety-critical calibration data; immune to radiation-induced bit flips common in flash-based alternatives. |
Use Scenario: Storing secure bootloader and cryptographic keys in retail POS terminals subject to physical tampering and environmental stress. IC Role / Device Role / Timing Role: Immutable firmware vault accessed at power-on; isolated from application software via hardware address decoding. Use Value: Provides root-of-trust foundation for secure boot chain; resists glitch attacks due to absence of erase/write command sequences. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C020-15PI | Same die, PDIP package (32P6); 0.600" width; through-hole mounting. | Preferred for prototyping, manual soldering, or legacy board rework where PLCC socketing is unavailable. | Select when mechanical compatibility with existing DIP footprints or hand-soldering requirements dominate. |
| AT27C020-15TI | Same die, TSOP package (32T); surface-mount, 8.2 × 13.5 mm; thinner profile. | Suitable for space-constrained consumer electronics or compact industrial modules where PLCC height exceeds stack budget. | Select when PCB area and component height are constrained, and reflow assembly is available. |
Compared with AT27C020-15PI and AT27C020-15TI, the AT27C020-15JI offers identical electrical performance and OTP functionality but delivers superior thermal cycling reliability in PLCC form factor-critical for industrial systems undergoing repeated thermal stress during field operation.
Availability
AT27C020-15JI is available at Aetrix Electronics and suitable for industrial control systems, legacy microcontroller platforms, and automotive calibration modules requiring stable component supply and long-term obsolescence management.
Supply support for AT27C020-15JI 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, specialized in non-volatile memory and microcontroller solutions for industrial, automotive, and computing markets before its 2016 acquisition.
The AT27C020 product line was engineered for high-reliability, low-power OTP firmware storage in systems where flash endurance or battery dependency posed design constraints-targeting PLCs, test equipment, and automotive ECUs.
FAQ
What is the maximum read access time specification for AT27C020-15JI?
The AT27C020-15JI has a maximum read access time of 150 ns under industrial temperature conditions (–40°C to +85°C) and 5V ±10% supply. This value is guaranteed across the full operating range and defines the worst-case delay from address valid to stable data output, critical for timing closure in high-speed 8-bit microprocessor buses.
Does AT27C020-15JI require a separate programming voltage during normal read operation?
No. The AT27C020-15JI operates from a single 5V ±10% supply during read mode. VPP = 13.0 V is required only during programming; it must be disconnected or held at 5V during read operation to prevent damage. The datasheet mandates strict sequencing: VCC must be applied before and removed after VPP.
Can AT27C020-15JI be used as a direct replacement for AT27C020-15JC in commercial-temperature designs?
Yes, the AT27C020-15JI and AT27C020-15JC share identical speed grade (150 ns), memory organization, pinout, and DC/AC specifications. The only difference is temperature rating: JC is commercial (0°C to 70°C), while JI is industrial (–40°C to +85°C). Using AT27C020-15JI in commercial designs provides extended thermal margin without functional or layout changes.
What is the purpose of the PGM pin on AT27C020-15JI?
The PGM pin on AT27C020-15JI is an active-low programming strobe that initiates the 100 µs byte-programming pulse when asserted under 13 V VPP and 6.5 V VCC conditions. It is unused and must be held high (VIH ≥ 2.0 V) during read mode to prevent accidental programming; no external pull-up is required as internal circuitry ensures safe default state.
How does the Integrated Product Identification Code function in AT27C020-15JI?
The AT27C020-15JI implements a two-byte electronic ID: Manufacturer ID = 0x1E and Device ID = 0x86. These are read by toggling A0 while holding A9 at 12.0 V and all other address lines low. This feature allows automated programmers to verify part identity and auto-select correct algorithms-ensuring reliable programming without manual configuration errors.
AT27C020-15JI 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:
- 150 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT27C020-15JI FAQ
1.How can I place an order for AT27C020-15JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C020-15JI 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 AT27C020-15JI reliable?
The price and inventory of AT27C020-15JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C020-15JI is usually 5 days.
3.What payment methods are accepted for AT27C020-15JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C020-15JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C020-15JI?
AT27C020-15JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C020-15JI 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 AT27C020-15JI?
For technical support, including AT27C020-15JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C020-15JI requirements.
6.How does Aetrix verify that AT27C020-15JI is sourced from the original manufacturer or authorized distributors?
All AT27C020-15JI 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 AT27C020-15JI meets industry standards.
7.What is the process for return or replacement of AT27C020-15JI?
All AT27C020-15JI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C020-15JI, 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 AT27C020-15JI part is unused and in its original packaging.
Return procedure for AT27C020-15JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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