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Microchip Technology AT27C020-15PC
- Part No.:
- AT27C020-15PC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-DIP (0.600", 15.24mm)
- Datasheet:
-
AT27C020-15PC.pdf
- Description:
- IC EPROM 2MBIT PARALLEL 32DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,584
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Product details
Overview
AT27C020-15PC 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 commercial temperature range (0°C to 70°C) in a 32-lead PDIP package. Used in embedded boot code storage where non-volatility, low active current (25 mA at 5 MHz), and JEDEC-standard compatibility are required.
For engineers reviewing the AT27C020-15PC datasheet, AT27C020-15PC pinout, AT27C020-15PC application, or AT27C020-15PC equivalent, key selection criteria include verified 150 ns tACC timing, VPP-programmable OTP architecture, CMOS/TTL I/O compatibility, integrated product identification code, and support for two-line control (CE/OE) to prevent bus contention.
Technical Context
The AT27C020-15PC implements a parallel-addressed OTP EPROM architecture with 18 address lines (A0–A17) and 8 bidirectional data outputs (O0–O7). Its dual-control interface uses CE (chip enable) and OE (output enable) to manage output state and bus isolation independently.
Programming relies on external 12.0 V ±0.5 V VPP applied during Rapid™ algorithm execution (100 µs/byte typical), while read mode requires only 5V. The device integrates an electronic identification code accessible via A9 and A0 toggling, enabling automatic algorithm selection in industry-standard programmers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2,097,152 bits (256K × 8); sufficient for full microcontroller boot firmware or configuration tables. |
| Read Access Time (tACC) | 150 ns max; eliminates WAIT states in 5–8 MHz microprocessor buses. |
| VCC Supply | 5V ±10%; compatible with standard logic rails without regulation overhead. |
| Active Current (ICC) | 25 mA max at 5 MHz; enables low-power system-level power budgeting. |
| Standby Current (ISB1) | 100 µA max (CMOS CE); supports low-quiescent-power hold modes. |
| ESD Protection | 2,000V HBM; meets industrial handling requirements without additional protection circuitry. |
| Latch-up Immunity | 200 mA; ensures robustness against transient overcurrent events on I/O or supply pins. |
Pinout & Package
AT27C020-15PC is supplied in a 32-lead, 0.600" wide plastic dual in-line package (PDIP), per JEDEC MS-016 AE standard. Pin 1 is marked by a notch or dot; package dimensions are 1.64" × 0.590" (41.7 mm × 15.0 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit parallel address bus; selects one of 256K bytes for read or program access. |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus; outputs valid data when CE=OE=low; high-Z otherwise. |
| CE | Chip Enable | Primary chip select; must be low for read or program operations; controls internal array activation. |
| OE | Output Enable | Secondary gate for output drivers; allows bus sharing without changing CE state. |
| PGM | Program Strobe | Active-low signal that initiates byte programming when VPP = 12 V and CE = low. |
| VPP | Programming Voltage | 12.0 V ±0.5 V input required only during programming; must be applied after VCC and removed before VCC. |
| VCC | Power Supply | +5V ±10% main supply; powers logic and memory array in read mode; raised to 6.5 V during programming. |
| GND | Ground | Reference node for all signals and supplies; requires local 0.1 µF ceramic decoupling. |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time reduces production burn-in cycle duration significantly. |
| Integrated Product Identification Code | Manufacturer ID (0x1E) and Device Code (0x86) readable via A9/VH and A0 toggle-enables auto-detection in programming tools. |
| Two-Line Control (CE + OE) | Enables independent management of chip selection and output gating-prevents bus contention in shared-memory systems. |
| CMOS- and TTL-Compatible I/O | Accepts standard CMOS and TTL logic thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V), eliminating level-shifter requirements. |
| High-Reliability Process | 2,000V ESD rating and 200 mA latch-up immunity ensure field reliability in industrial environments. |
Applications
| Industrial PLC Firmware Storage | Legacy Microcontroller Boot ROM |
|---|---|
|
Use Scenario: Storing fixed ladder logic and I/O mapping firmware in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Non-volatile boot memory providing deterministic 150 ns read access to instruction fetch pipeline. Use Value: Eliminates reliance on slow serial EEPROM or external flash; supports direct XIP execution from parallel bus without wait states. |
Use Scenario: Holding immutable startup code and hardware initialization routines for 8/16-bit microcontrollers in medical instrumentation. IC Role / Device Role / Timing Role: OTP EPROM acting as primary boot ROM accessed at power-on reset via address/data bus. Use Value: Guarantees firmware integrity-no accidental overwrite risk unlike UV-erasable EPROM or flash variants. |
| Automotive Instrument Cluster Calibration Data | Telecom Line Card Configuration Memory |
|
Use Scenario: Storing calibrated sensor offsets and display lookup tables in automotive digital instrument clusters operating across -40°C to +125°C. IC Role / Device Role / Timing Role: Temperature-stable OTP memory delivering consistent tACC performance across full automotive grade range. Use Value: Meets AEC-Q100 stress requirements via 200 mA latch-up immunity and 2,000V ESD-reducing need for external protection. |
Use Scenario: Holding line-specific configuration parameters (e.g., impedance profiles, gain settings) in telecom DSLAM line cards. IC Role / Device Role / Timing Role: Parallel-access configuration store enabling fast re-initialization after hot-swap or reset. Use Value: 25 mA active current at 5 MHz allows dense memory placement without thermal derating in air-cooled chassis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C256B-150DC | 256K × 8 OTP EPROM, 150 ns access, 5V-only operation (no VPP required), PLCC/TSOP only-no PDIP option. | Eliminates high-voltage programming infrastructure but lacks PDIP packaging and integrated ID code. | Select when board space constraints favor surface-mount packages and VPP circuitry must be omitted. |
| MX27C256-15PC | 256K × 8 OTP EPROM, 150 ns access, requires 12.5 V VPP, PDIP/PLCC/TSOP; no integrated ID code or Rapid™ algorithm. | Compatible pinout and voltage specs but lacks auto-identification and faster programming-requires manual algorithm setup. | Select when legacy toolchain support for MX27C256 is established and identification features are unused. |
Compared with AM27C256B-150DC and MX27C256-15PC, the AT27C020-15PC uniquely combines PDIP availability, integrated product ID, and Rapid™ programming-making it optimal for through-hole prototyping, automated programming line integration, and firmware traceability in regulated industries.
Availability
AT27C020-15PC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy microcontroller boot ROM, and automotive instrument cluster calibration data requiring stable component supply across extended lifecycle planning.
Supply support for AT27C020-15PC 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, non-volatile memory, and secure authentication ICs.
The AT27C020-15PC belongs to Atmel's 27C-series OTP EPROM product line, engineered for reliable firmware storage in cost-sensitive, high-reliability embedded systems where data immutability and JEDEC-standard compatibility are mandatory.
FAQ
What is the maximum read access time specified for the AT27C020-15PC?
The AT27C020-15PC has a maximum read access time (tACC) of 150 ns under standard conditions (VCC = 5V ±10%, TA = 0°C to 70°C). This value is guaranteed across the commercial temperature range and applies when both CE and OE are asserted low. The "-15" suffix explicitly denotes this 150 ns speed grade, distinguishing it from faster (-55, -70) or slower (-12) variants of the AT27C020 family.
Does the AT27C020-15PC require a high-voltage supply for normal operation?
No-the AT27C020-15PC operates from a single 5V ±10% supply during read mode. A 12.0 V ±0.5 V VPP supply is required only during programming, and must be applied after VCC and removed before VCC per datasheet sequencing rules. In standby or active read states, VPP may be tied to VCC or left unconnected depending on system design, but no high-voltage circuitry is needed for runtime functionality of the AT27C020-15PC.
How is the Integrated Product Identification Code accessed on the AT27C020-15PC?
The AT27C020-15PC identification code is read by asserting A9 at 12.0 V ±0.5 V (VID), holding A1–A17 low, and toggling A0: low selects the Manufacturer ID byte (0x1E), high selects the Device Code byte (0x86). Both bytes appear on O0–O7 with CE and OE low. This feature enables automatic device recognition in programming equipment and eliminates manual part selection-critical for high-volume AT27C020-15PC programming lines.
Can the AT27C020-15PC be used in place of a UV-erasable EPROM like the 27C256?
Yes-the AT27C020-15PC is pin-compatible with the 27C256 in PDIP, PLCC, and TSOP packages and shares identical address/data/control pinouts (A0–A15, O0–O7, CE, OE, PGM, VPP, VCC, GND). However, the AT27C020-15PC offers double the density (256K vs. 128K), faster access (150 ns vs. 200 ns for -20 variants), and eliminates UV erasure-making it a functional upgrade for systems needing higher capacity or simplified manufacturing flow without modifying PCB layout for the AT27C020-15PC.
What decoupling capacitance is recommended for stable operation of the AT27C020-15PC?
Atmel specifies a minimum 0.1 µF high-frequency ceramic capacitor between VCC and GND, placed as close as possible to the AT27C020-15PC pins. For boards with multiple EPROMs, a 4.7 µF bulk electrolytic capacitor should also be added near the power entry point. These values suppress transient excursions during CE switching and ensure stable VCC during rapid output transitions-directly preventing non-conformance due to supply droop in the AT27C020-15PC.
AT27C020-15PC 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:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 32-PDIP
AT27C020-15PC FAQ
1.How can I place an order for AT27C020-15PC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C020-15PC 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 AT27C020-15PC reliable?
The price and inventory of AT27C020-15PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C020-15PC is usually 5 days.
3.What payment methods are accepted for AT27C020-15PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C020-15PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C020-15PC?
AT27C020-15PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C020-15PC 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 AT27C020-15PC?
For technical support, including AT27C020-15PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C020-15PC requirements.
6.How does Aetrix verify that AT27C020-15PC is sourced from the original manufacturer or authorized distributors?
All AT27C020-15PC 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 AT27C020-15PC meets industry standards.
7.What is the process for return or replacement of AT27C020-15PC?
All AT27C020-15PC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C020-15PC, 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 AT27C020-15PC part is unused and in its original packaging.
Return procedure for AT27C020-15PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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