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Microchip Technology AT27C020-55PI
- Part No.:
- AT27C020-55PI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-DIP (0.600", 15.24mm)
- Datasheet:
-
AT27C020-55PI.pdf
- Description:
- IC EPROM 2MBIT PARALLEL 32DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,805
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Product details
Overview
AT27C020-55PI from Atmel is a 2-Mbit (256K × 8) one-time programmable EPROM with 55 ns read access time, 5V ±10% supply operation, and industrial temperature range (–40°C to +85°C). It features CMOS/TTL-compatible I/O, dual-line control (CE/OE), and rapid programming at 100 µs/byte - enabling firmware storage in microprocessor systems without wait states.
For engineers reviewing the AT27C020-55PI datasheet, AT27C020-55PI pinout, AT27C020-55PI application, or AT27C020-55PI equivalent, key selection criteria include OTP reliability, 55 ns read timing, industrial-grade standby current (≤100 µA), JEDEC-standard PDIP-32 packaging, and compatibility with legacy 5V bus architectures.
Technical Context
The AT27C020-55PI implements a parallel-addressable OTP memory architecture with 18 address lines (A0–A17) and 8 bidirectional data outputs (O0–O7), supporting standard microprocessor bus interfacing via CE and OE controls. Its Rapid™ programming algorithm uses 100 µs pulses at VPP = 13.0 V and VCC = 6.5 V for byte-level programming with verification loops.
It operates exclusively in 5V read mode with no external voltage translation required; VPP is only active during programming. The device integrates product identification logic (via A9/VH and A0 toggling) and meets 2,000V ESD and 200 mA latch-up immunity standards for robust industrial deployment.
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 bank switching. |
| Read Access Time | 55 ns max - eliminates WAIT states on 5 MHz Z80, 8051, or 68K-based systems. |
| Supply Voltage | 5V ±10% - compatible with standard TTL/CMOS logic rails; no auxiliary voltage regulators needed. |
| Standby Current | 100 µA max - enables low-power hold modes in battery-backed or energy-sensitive embedded systems. |
| Active Current | 25 mA max at 5 MHz - predictable power budgeting for thermal design in dense PCB layouts. |
| Programming Voltage | VPP = 13.0 V ±0.25 V - requires dedicated high-voltage programming circuitry; not compatible with standard 5V-only programmers. |
| Operating Temperature | –40°C to +85°C - qualified for industrial control, motor drives, and factory automation environments. |
Pinout & Package
AT27C020-55PI is supplied in a 32-lead, 0.600" wide plastic dual-inline package (PDIP), per JEDEC MS-016 AE. Pin 1 is index-marked; leads are tin-lead plated with 0.025" pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus interface; selects one of 256K bytes; driven by microprocessor address lines. |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus; outputs valid within 55 ns after CE/OE assertion; high-impedance when disabled. |
| CE | Chip Enable | Active-low global enable; must be asserted before OE to avoid bus contention; controls power state transition. |
| OE | Output Enable | Active-low output gate; allows shared bus operation with other peripherals; decouples memory from data bus when deasserted. |
| PGM | Program Strobe | Active-low pulse input during programming; triggers 100 µs write cycle when VPP = 13 V and address is latched. |
| VPP | Programming Voltage | 13.0 V input during programming only; must be applied after VCC and removed before VCC to prevent damage. |
| VCC | Power Supply | +5V ±10% main supply; powers logic and outputs in read mode; supplies 6.5 V during programming. |
| GND | Ground Reference | Signal and power return; requires local 0.1 µF ceramic decoupling capacitor per device per datasheet layout guidance. |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming | 100 µs/byte typical - reduces firmware update time by >90% vs. conventional EPROM algorithms; includes auto-verify and up to 10 re-pulse attempts per byte. |
| Integrated ID Code | Manufacturer ID (0x1E) and Device Code (0x86) accessible via A9/VH and A0 toggle - enables automatic algorithm selection in production programmers. |
| Two-Line Control Logic | Independent CE and OE inputs - permits flexible bus arbitration and partial decoding schemes without external glue logic. |
| High-Reliability Process | 2,000V HBM ESD rating and 200 mA latch-up immunity - ensures survivability in handling, assembly, and harsh industrial EMI environments. |
| JEDEC Standard Packaging | PDIP-32 (32P6) footprint - supports through-hole manufacturing, socket-based prototyping, and legacy board rework compatibility. |
Applications
| Industrial PLC Firmware Storage | Legacy Microcontroller Boot ROM |
|---|---|
Use Scenario: Fixed-function programmable logic controllers require non-volatile, tamper-resistant firmware that persists across power cycles and field updates. IC Role / Device Role / Timing Role: OTP EPROM providing boot code and control logic lookup tables; accessed via 8051 or 68HC11 address/data bus with 55 ns timing compliance. Use Value: Eliminates need for battery-backed SRAM or EEPROM wear management; withstands industrial vibration and temperature cycling without data corruption. |
Use Scenario: Embedded systems using obsolete 8-bit MCUs (e.g., Z80, 8085) rely on mask-ROM-equivalent storage for immutable startup routines and driver code. IC Role / Device Role / Timing Role: Read-only memory mapped into CPU address space; CE/OE timing satisfies 5 MHz bus cycle requirements without wait-state insertion. Use Value: Enables drop-in replacement for older 27C256 or 27C512 parts where pinout and timing match; avoids redesign of legacy hardware. |
| Automotive Instrument Cluster Calibration Data | Medical Device Configuration Memory |
Use Scenario: Analog/digital instrument clusters store calibrated sensor offsets and display mapping tables that must remain unaltered post-manufacture. IC Role / Device Role / Timing Role: Non-modifiable configuration store accessed during power-on initialization; operates across –40°C to +125°C automotive grade variants (note: AT27C020-55PI is industrial; automotive variant is AT27C020-55PA). Use Value: Provides permanent, radiation-tolerant storage immune to accidental overwrite - critical for safety-critical calibration integrity. |
Use Scenario: Class II medical devices (e.g., infusion pumps, diagnostic monitors) require FDA-auditable, immutable configuration parameters such as alarm thresholds and calibration coefficients. IC Role / Device Role / Timing Role: Secure, one-time-programmable memory holding regulatory-mandated settings; accessed during boot sequence under IEC 62304 software lifecycle controls. Use Value: Meets traceability and revision-lock requirements without firmware signing overhead; supports audit-ready BOM documentation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C020-55PC | Same die, identical electrical specs, but in PDIP-32 commercial temp range (0°C to 70°C); lower cost, no industrial qualification testing. | Suitable for lab prototypes, consumer electronics, or indoor equipment where ambient temperature stays within 0–70°C. | Select AT27C020-55PC if operating environment is controlled and cost sensitivity outweighs extended temperature margin. |
| AT27C020-55TI | Same die, identical electrical specs, but in TSOP-32 industrial package; 12.1 mm × 20.0 mm surface-mount footprint vs. 38.1 mm × 15.2 mm PDIP. | Required for space-constrained PCBs, automated SMT assembly, or designs targeting RoHS-compliant reflow profiles. | Select AT27C020-55TI when board real estate or manufacturing process mandates surface-mount packaging. |
Compared with AT27C020-55PC and AT27C020-55TI, the AT27C020-55PI offers the same 55 ns timing and OTP functionality but uniquely combines industrial temperature rating with through-hole PDIP-32 packaging - making it optimal for ruggedized, serviceable, or legacy-replacement designs requiring field-replaceable sockets and extended thermal resilience.
Availability
AT27C020-55PI is available at Aetrix Electronics and suitable for industrial control systems, legacy microcontroller upgrades, and medical device configuration storage requiring stable component supply across long production lifecycles.
Supply support for AT27C020-55PI 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 manufacturer 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, designed specifically for firmware and configuration storage in industrial, automotive, and medical systems where data immutability, long-term retention, and 5V bus compatibility are mandatory.
FAQ
What is the maximum read access time specified for the AT27C020-55PI?
The AT27C020-55PI has a maximum read access time of 55 ns under industrial temperature conditions (–40°C to +85°C) and 5V ±10% supply. This value is guaranteed across the full operating range and is measured from address/CE/OE assertion to valid data on O0–O7 outputs, ensuring compatibility with 5 MHz microprocessor buses without wait-state insertion.
Does the AT27C020-55PI support in-system programming?
No, the AT27C020-55PI does not support in-system programming. It requires external high-voltage (13.0 V) programming via the VPP pin and dedicated EPROM programmers. Programming must occur off-board using a socketed fixture, as VPP cannot be safely generated within most live 5V systems - the AT27C020-55PI is strictly an OTP device with no erase capability.
What package type is used for the AT27C020-55PI?
The AT27C020-55PI is packaged in a 32-lead, 0.600" wide plastic dual-inline package (PDIP), designated as 32P6 per JEDEC MS-016 AE. This through-hole package features 0.100" lead spacing, tin-lead terminations, and is compatible with standard DIP sockets and wave-solder processes used in industrial electronics manufacturing.
Can the AT27C020-55PI be used as a direct replacement for the AT27C020-70PI?
Yes, the AT27C020-55PI can replace the AT27C020-70PI in most applications, as both share identical pinout, voltage specs, and industrial temperature range. The key difference is read speed: AT27C020-55PI guarantees ≤55 ns access, while AT27C020-70PI guarantees ≤70 ns. Systems designed for the slower part will operate reliably with the faster AT27C020-55PI, but timing margins should be verified in high-speed bus interfaces.
What is the purpose of the PGM pin on the AT27C020-55PI?
The PGM pin on the AT27C020-55PI is an active-low programming strobe used exclusively during OTP write cycles. When asserted with VPP = 13.0 V and correct address/data setup, it triggers a 100 µs internal programming pulse. The PGM pin has no function during read mode and must remain unconnected or held high (VIH) in normal operation to prevent accidental programming.
AT27C020-55PI 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:
- 55 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
AT27C020-55PI FAQ
1.How can I place an order for AT27C020-55PI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C020-55PI 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 AT27C020-55PI reliable?
The price and inventory of AT27C020-55PI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C020-55PI is usually 5 days.
3.What payment methods are accepted for AT27C020-55PI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C020-55PI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C020-55PI?
AT27C020-55PI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C020-55PI 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 AT27C020-55PI?
For technical support, including AT27C020-55PI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C020-55PI requirements.
6.How does Aetrix verify that AT27C020-55PI is sourced from the original manufacturer or authorized distributors?
All AT27C020-55PI 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 AT27C020-55PI meets industry standards.
7.What is the process for return or replacement of AT27C020-55PI?
All AT27C020-55PI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C020-55PI, 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 AT27C020-55PI part is unused and in its original packaging.
Return procedure for AT27C020-55PI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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