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Microchip Technology AT27C020-15PI
- Part No.:
- AT27C020-15PI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-DIP (0.600", 15.24mm)
- Datasheet:
-
AT27C020-15PI.pdf
- Description:
- IC EPROM 2MBIT PARALLEL 32DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,235
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Product details
Overview
AT27C020-15PI from Atmel is a 2-Mbit (256K × 8) one-time programmable EPROM designed for firmware storage in embedded microprocessor systems. It delivers 55 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 PDIP package. Its dual-line control (CE/OE), CMOS/TTL compatibility, and Rapid™ programming (100 µs/byte) enable drop-in replacement of mask ROM or older EPROMs in legacy industrial controllers.
For engineers reviewing the AT27C020-15PI datasheet, AT27C020-15PI pinout, AT27C020-15PI application, or AT27C020-15PI equivalent, key selection criteria include verified 55 ns tACC timing at industrial temperature, VPP = 12.0 V programming voltage, CE/OE two-control architecture, 100 µA max standby current, and JEDEC-standard 32P6 PDIP mechanical compatibility with legacy socket designs.
Technical Context
The AT27C020-15PI implements a standard OTP EPROM architecture with address decoding for A0–A17 (256K addresses), 8-bit bidirectional data outputs (O0–O7), and dedicated program control via PGM and VPP pins. It uses high-reliability CMOS process with 2,000V ESD protection and 200 mA latch-up immunity.
Its read operation requires only VCC = 5V ±10%; programming demands elevated VPP = 12.0 ±0.5V and VCC = 6.5 ±0.25V. The device supports product identification via A9/VH and A0 toggling to output manufacturer (0x1E) and device code (0x86) bytes - a feature used by industry-standard programmers for algorithm auto-selection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2,097,152 bits (256K × 8) - stores full firmware images for 8-bit microcontrollers without external banking logic |
| Read Access Time (tACC) | 150 ns max (–40°C to +85°C) - ensures no WAIT states required on 5 MHz Z80 or 8051 bus cycles |
| Supply Voltage | 5V ±10% - compatible with standard TTL/CMOS logic rails; no auxiliary voltage regulators needed |
| Standby Current (ISB1) | 100 µA max - enables low-power retention in battery-backed industrial modules |
| Programming Voltage (VPP) | 12.0 ±0.5 V - requires dedicated programming supply; not derived from VCC |
| ESD Protection | 2,000 V HBM - meets IEC 61000-4-2 Level 2 for handling in non-ESD-controlled assembly environments |
| Operating Temperature | –40°C to +85°C - qualified for industrial PLC backplanes and motor drive control boards |
Pinout & Package
AT27C020-15PI is supplied in a 32-lead, 0.600" wide plastic dual inline package (PDIP), per JEDEC MS-016 AE. Pin 1 is marked with a notch or dot; package height is 0.195" (4.95 mm) max.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 256K address space selection; all inputs must be stable before CE/OE assertion for valid read |
| O0–O7 | Data Outputs | CMOS/TTL-compatible 8-bit data bus; high-impedance when CE or OE is high |
| CE | Chip Enable | Primary chip-select; device active only when CE = VIL; controls power state transition |
| OE | Output Enable | Secondary gate for output drivers; allows bus sharing without changing CE state |
| PGM | Program Strobe | Active-low pulse input during programming; initiates 100 µs write cycle when VPP is applied |
| VPP | Programming Supply | 12 V input required only during programming; must be applied after VCC and removed before VCC |
| VCC | Power Supply | 5 V ±10% main supply; powers logic and outputs in read mode; supplies 6.5 V during programming |
| GND | Ground | Reference for all signals and supplies; requires local 0.1 µF ceramic decoupling per device |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical - reduces firmware update time by >5× vs. legacy EPROMs; includes automatic verify/reprogram loop |
| Integrated Product ID Code | Manufacturer ID (0x1E) and Device Code (0x86) readable via A9/A0 - enables automated programmer setup without manual part selection |
| Two-Line Control Architecture | Independent CE and OE inputs - eliminates bus contention in multi-device systems; supports partial decode schemes |
| High-Reliability CMOS Process | 2,000 V ESD rating and 200 mA latch-up immunity - sustains operation in electrically noisy factory-floor environments |
| JEDEC-Standard Packages | 32P6 PDIP footprint - direct replacement for obsolete 27C256, 27C512, and 27C010 in existing sockets and PCBs |
Applications
| Industrial PLC Firmware Storage | Legacy Microcontroller Boot ROM |
|---|---|
Use Scenario: Storing ladder logic execution firmware in modular programmable logic controllers with 8051-based CPU modules. IC Role / Device Role / Timing Role: Non-volatile boot memory providing immediate instruction fetch at power-on; accessed via 8-bit data bus with 55 ns tACC. Use Value: Eliminates need for external wait-state generators; supports deterministic real-time scan cycles under –40°C cold-start conditions. |
Use Scenario: Holding fixed initialization code and peripheral drivers for Z80-based CNC motion controllers deployed since the 1990s. IC Role / Device Role / Timing Role: OTP replacement for mask ROM; provides field-upgradable firmware without socketing EEPROM complexity. Use Value: Enables reprogramming in manufacturing test fixtures using standard EPROM programmers; retains data >20 years at 85°C. |
| Automotive Instrument Cluster Calibration Data | Medical Device Configuration Memory |
Use Scenario: Storing calibrated sensor offsets and display mapping tables in analog-digital hybrid instrument clusters for commercial vehicles. IC Role / Device Role / Timing Role: Read-only configuration store accessed during startup; isolated from volatile RAM by CE gating. Use Value: Meets AEC-Q100 stress requirements via industrial-grade qualification; immune to radiation-induced bit flips in engine bay proximity. |
Use Scenario: Holding FDA-approved device calibration constants and safety-critical operational limits in Class II infusion pumps. IC Role / Device Role / Timing Role: Tamper-proof, non-rewritable memory for immutable configuration; programmed once during final test. Use Value: Prevents accidental or malicious runtime modification; supports audit trail via integrated ID code verification during production test. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C020-15JC | Same die, commercial temp range (0°C to 70°C); identical AC/DC specs except ISB1 = 100 µA max at 25°C only | Valid only for lab/test equipment or indoor consumer devices; not rated for thermal cycling in enclosures | Select only if operating ambient stays within 0–70°C and long-term reliability at temperature extremes is not required |
| AM27C256B-150DC | 256K × 8 OTP EPROM; 150 ns tACC; 5V supply; but requires VPP = 21 V and lacks integrated ID code | Needs higher-voltage programming hardware; no auto-ID support increases programming setup time | Choose only if legacy AMI-based programmers are already deployed and ID code automation is unnecessary |
Compared with AT27C020-15JC, the AT27C020-15PI guarantees 100 µA max standby current across –40°C to +85°C and supports extended thermal cycling; compared with AM27C256B-150DC, it reduces programming voltage by 9 V and embeds ID code for zero-configuration programming - critical for high-mix industrial firmware lines.
Availability
AT27C020-15PI is available at Aetrix Electronics and suitable for industrial control systems, legacy microcontroller upgrades, and medical device calibration storage requiring stable component supply over extended production lifecycles.
Supply support for AT27C020-15PI 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 was a U.S.-based semiconductor company specializing in microcontrollers, non-volatile memory, and secure authentication ICs before its acquisition by Microchip Technology in 2016.
The AT27C020 belongs to Atmel's 27C-series OTP EPROM family, engineered for reliable firmware storage in cost-sensitive, high-reliability industrial and automotive applications where reprogrammability is unnecessary but long-term data retention is mandatory.
FAQ
What is the maximum allowable VPP voltage for programming the AT27C020-15PI?
The AT27C020-15PI requires VPP = 12.0 ±0.5 V during programming, with absolute maximum rating of +14.0 V. Exceeding 12.5 V risks oxide breakdown in the floating-gate cells, leading to premature data retention failure. The AT27C020-15PI datasheet specifies VID = 11.5–12.5 V for product ID read mode, confirming tight tolerance. Always apply VPP after VCC and remove it before VCC to prevent latch-up.
Does the AT27C020-15PI support read operations while VPP is connected?
No - the AT27C020-15PI must have VPP disconnected or held at VCC level (≤5.5 V) during normal read mode. If VPP remains at 12 V while CE/OE are asserted, the device enters undefined behavior; outputs may float or source excessive current. The AT27C020-15PI datasheet explicitly states VPP must be "removed simultaneously or after VCC" post-programming, and "VPP may be connected directly to VCC except during programming."
Can the AT27C020-15PI be used as a direct replacement for the AT27C256B in existing PDIP sockets?
No - although both are 32-pin PDIP OTP EPROMs, the AT27C020-15PI has 256K × 8 (2 Mbit) density versus AT27C256B's 32K × 8 (256 Kbit), requiring different address decoding (A15–A17 present on AT27C020-15PI, absent on AT27C256B). Pin functions also differ: AT27C020-15PI uses A16/A17, while AT27C256B repurposes those pins as NC. Physical fit does not guarantee functional compatibility.
What decoupling capacitance is required for stable operation of the AT27C020-15PI?
The AT27C020-15PI requires a minimum 0.1 µF high-frequency ceramic capacitor between VCC and GND, placed as close to the device as possible. For systems with multiple AT27C020-15PI devices or high-current peripherals, a 4.7 µF bulk electrolytic capacitor must also be added near the power entry point. These values are specified in the "System Considerations" section of the AT27C020-15PI datasheet to suppress transients during CE transitions.
How is the Integrated Product Identification Code accessed on the AT27C020-15PI?
The AT27C020-15PI ID code is read by asserting CE = VIL, OE = VIL, setting A9 = 12.0 V (VH), and toggling A0 between VIL (for Manufacturer ID = 0x1E) and VIH (for Device Code = 0x86), while holding A1–A17 = VIL. This sequence causes the AT27C020-15PI to output the respective 8-bit code on O0–O7. Standard EPROM programmers use this feature to auto-detect part number and select correct algorithms.
AT27C020-15PI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-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:
- 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:
- Through Hole
- Supplier Device Package:
- 32-PDIP
AT27C020-15PI FAQ
1.How can I place an order for AT27C020-15PI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C020-15PI 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 AT27C020-15PI reliable?
The price and inventory of AT27C020-15PI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C020-15PI is usually 5 days.
3.What payment methods are accepted for AT27C020-15PI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C020-15PI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C020-15PI?
AT27C020-15PI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C020-15PI 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 AT27C020-15PI?
For technical support, including AT27C020-15PI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C020-15PI requirements.
6.How does Aetrix verify that AT27C020-15PI is sourced from the original manufacturer or authorized distributors?
All AT27C020-15PI 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 AT27C020-15PI meets industry standards.
7.What is the process for return or replacement of AT27C020-15PI?
All AT27C020-15PI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C020-15PI, 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 AT27C020-15PI part is unused and in its original packaging.
Return procedure for AT27C020-15PI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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