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Microchip Technology AT27C020-15TC
- Part No.:
- AT27C020-15TC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT27C020-15TC.pdf
- Description:
- IC EPROM 2MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,128
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Product details
Overview
AT27C020-15TC 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 commercial temperature range (0°C to 70°C). Its JEDEC-standard 32-lead TSOP package enables high-density PCB layouts in space-constrained applications such as industrial controllers and legacy BIOS modules.
For engineers reviewing the AT27C020-15TC datasheet, AT27C020-15TC pinout, AT27C020-15TC application, or AT27C020-15TC equivalent, key selection considerations include its OTP architecture, 100 µs/byte Rapid™ programming speed, CMOS/TTL compatibility, 25 mA active current at 5 MHz, and dual-line control (CE/OE) for bus contention management.
Technical Context
The AT27C020-15TC implements a parallel-addressed OTP EPROM architecture with 18 address lines (A0–A17) and 8 bidirectional data outputs (O0–O7), enabling direct byte-access without WAIT states. Its two-level enable logic (CE and OE) allows flexible memory mapping and eliminates bus conflicts during partial decode.
Programming requires VPP = 13.0 V ±0.25 V and VCC = 6.5 V ±0.25 V, with a 100 µs PGM pulse width and built-in verification loop per byte. The Integrated Product Identification Code (Manufacturer ID = 0x1E, Device ID = 0x86) is accessed via A9 high-voltage mode (11.5–12.5 V) and A0 toggling, supporting automated programmer recognition.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2,097,152 bits (256K × 8) - provides sufficient capacity for boot code and fixed firmware in 8-bit/16-bit microcontroller systems. |
| Read Access Time | 150 ns max (tACC) - ensures compatibility with microprocessors requiring ≤150 ns memory cycle timing, e.g., Intel 80C188 or Motorola 68EC000 derivatives. |
| VCC Supply | 5 V ±10% - simplifies power design by eliminating need for auxiliary voltage rails; compatible with standard TTL/CMOS logic families. |
| Active Current | 25 mA max at 5 MHz - enables low-thermal-load operation in fanless industrial enclosures without forced cooling. |
| Standby Current | 100 µA max (ISB1, CMOS CE) - supports ultra-low-power sleep modes in battery-backed or energy-sensitive systems. |
| ESD Protection | 2,000 V HBM - meets IEC 61000-4-2 Level 2 requirements for handling robustness in manufacturing and field service environments. |
| Latch-up Immunity | 200 mA - prevents destructive latch-up under transient overvoltage or ESD events on address/data lines. |
Pinout & Package
AT27C020-15TC is housed in a 32-lead Plastic Thin Small Outline Package (TSOP, JEDEC MO-142 BD), measuring 11.5 mm × 20.2 mm × 1.2 mm (max height), with gull-wing leads optimized for reflow soldering and high-density PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit parallel address bus interface; selects one of 262,144 bytes (256K) for read or program operations. |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus; outputs valid data during read mode when CE and OE are asserted low. |
| CE | Chip Enable | Primary device select; places outputs in high-impedance state when high, enabling multi-chip memory decoding. |
| OE | Output Enable | Secondary output control; allows shared data bus usage with other peripherals without changing CE state. |
| PGM | Program Strobe | Active-low signal initiating 100 µs programming pulse; must be synchronized with VPP = 13 V and valid address/data. |
| VPP | Programming Voltage | 13.0 V ±0.25 V input required only during programming; must be applied after VCC and removed before VCC. |
| VCC | Power Supply | 5 V ±10% main supply; powers core logic and I/O buffers; supplies 25 mA max during active read at 5 MHz. |
| GND | Ground Reference | Signal and power return path; requires local 0.1 µF ceramic decoupling capacitor placed within 5 mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time with automatic verify-reprogram loop - reduces production programming cycle time by >5× vs. legacy EPROMs. |
| Integrated Product ID Code | Manufacturer ID (0x1E) and Device ID (0x86) accessible via A9 high-voltage mode - enables plug-and-play recognition in universal programmers and avoids manual part selection errors. |
| Two-Line Control (CE/OE) | Independent chip and output enables - permits interleaved memory access and eliminates bus contention in multi-peripheral systems without external logic. |
| JEDEC-Standard Packages | 32-lead TSOP (32T), PDIP (32P6), and PLCC (32J) options - ensures drop-in replacement across form factors and supports legacy board redesigns. |
| High-Reliability CMOS Process | 2,000 V ESD protection and 200 mA latch-up immunity - sustains operation in electrically noisy industrial environments without external protection circuitry. |
Applications
| Industrial PLC Firmware Storage | Legacy PC BIOS Modules |
|---|---|
|
Use Scenario: Storing fixed ladder logic firmware and I/O configuration tables in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile firmware ROM providing deterministic 150 ns read access to instruction fetches from 80C186-based CPU subsystems. Use Value: Eliminates reliance on slower serial EEPROM or flash, avoiding WAIT-state insertion and preserving real-time scan cycle integrity. |
Use Scenario: Holding POST routines and hardware initialization code in early-2000s desktop motherboards with ISA/PCI bus architectures. IC Role / Device Role / Timing Role: Boot ROM mapped to 0xE0000–0xFFFFF address space; accessed during cold reset before DRAM initialization. Use Value: Guarantees bit-perfect firmware execution with no wear-out mechanism, unlike reprogrammable flash used in later generations. |
| Automotive Instrument Cluster Calibration Data | Medical Device Safety Firmware |
|
Use Scenario: Storing calibrated sensor offset tables and display driver microcode in automotive digital instrument clusters operating across -40°C to +125°C. IC Role / Device Role / Timing Role: OTP memory holding immutable calibration constants; accessed via dedicated 8-bit bus during cluster power-up self-test. Use Value: Provides tamper-proof, radiation-hardened storage immune to bit flips or accidental rewrites during ECU electromagnetic transients. |
Use Scenario: Hosting FDA-certified bootloader and safety monitor firmware in Class II medical infusion pumps requiring traceable, unalterable code. IC Role / Device Role / Timing Role: Read-only execution memory verified at power-on; contents locked permanently after initial programming and audit. Use Value: Meets IEC 62304 §5.5.2 requirements for "software that cannot be modified in the field" through inherent one-time programmability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C256B-15JC | 256K × 8 OTP EPROM with 150 ns tACC, but uses 28-pin PDIP/PLCC; lacks integrated ID code and Rapid™ algorithm. | Requires external ID verification logic; slower programming (500 µs/byte typical); limited to 28-pin footprint. | Select when legacy 28-pin socket compatibility is mandatory and ID auto-detection is not required. |
| MX27C256-15PC | 256K × 8 OTP EPROM with identical 150 ns tACC and 5V supply, but rated only for commercial temp (0°C–70°C) and no VPP-based ID access. | No high-voltage product identification; lower ESD rating (1,500 V); no documented rapid programming sequence. | Choose for cost-sensitive commercial applications where ID code and enhanced reliability are non-critical. |
Compared with AM27C256B-15JC and MX27C256-15PC, the AT27C020-15TC offers faster programming, built-in ID code for automated tooling, higher ESD/latch-up immunity, and JEDEC-standard 32-pin TSOP support - making it preferable for new designs requiring production efficiency and robustness.
Availability
AT27C020-15TC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy PC BIOS modules, and automotive instrument cluster calibration data requiring stable component supply and long-term obsolescence management.
Supply support for AT27C020-15TC 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, nonvolatile memory, and analog products before its acquisition by Microchip Technology in 2016.
The AT27C020-15TC belongs to Atmel's 27C-series OTP EPROM family, engineered for reliable firmware storage in microprocessor-based systems where code immutability, fast read access, and industrial-grade reliability are essential.
FAQ
What is the maximum operating temperature range for the AT27C020-15TC?
The AT27C020-15TC is specified for the commercial temperature range of 0°C to 70°C. This is indicated by the "C" suffix in the ordering code and confirmed in the Ordering Information table on page 9 of the datasheet. It is not rated for industrial (–40°C to +85°C) or automotive (–40°C to +125°C) ranges - those variants use suffixes "I" and "A", respectively. Always verify ambient and junction temperature limits in system thermal analysis before deployment.
Does the AT27C020-15TC require a separate programming voltage during normal operation?
No, the AT27C020-15TC operates from a single 5V ±10% supply (VCC) during read mode. VPP = 13.0 V is required only during programming and must be applied after VCC and removed before VCC. During standby or active read, VPP may be tied to VCC (5 V) with no adverse effect. This simplifies power design in systems where programming occurs off-board using dedicated programmers.
How does the Rapid™ Programming Algorithm improve production efficiency for the AT27C020-15TC?
The Rapid™ Programming Algorithm reduces AT27C020-15TC programming time to ~100 µs per byte with automatic verification and up to 10 reprogramming attempts per failed byte. This cuts total programming time by more than 5× compared to conventional EPROM algorithms, directly lowering test-floor dwell time and increasing throughput in high-volume firmware loading operations.
Can the AT27C020-15TC be used as a direct replacement for the AT27C020-15PC in an existing PDIP-based design?
No - the AT27C020-15TC uses a 32-lead TSOP package while the AT27C020-15PC uses a 32-lead PDIP. Though both share identical pin functions and electrical specifications, their physical footprints, lead pitch (0.5 mm TSOP vs. 2.54 mm PDIP), and soldering methods are incompatible. A PCB redesign is required to migrate from PDIP to TSOP.
What is the purpose of the Integrated Product Identification Code in the AT27C020-15TC?
The Integrated Product Identification Code in the AT27C020-15TC provides Manufacturer ID (0x1E) and Device ID (0x86) accessible via A9 high-voltage mode (11.5–12.5 V) and A0 toggling. This enables universal programmers to auto-detect the part, select correct algorithms/voltages, and prevent misprogramming - critical for mixed-BOM production lines handling multiple EPROM variants.
AT27C020-15TC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-TFSOP (0.724", 18.40mm Width)
- Packaging:
- Tray
- 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:
- Surface Mount
- Supplier Device Package:
- 32-TSOP
AT27C020-15TC FAQ
1.How can I place an order for AT27C020-15TC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C020-15TC 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 AT27C020-15TC reliable?
The price and inventory of AT27C020-15TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C020-15TC is usually 5 days.
3.What payment methods are accepted for AT27C020-15TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C020-15TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C020-15TC?
AT27C020-15TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C020-15TC 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 AT27C020-15TC?
For technical support, including AT27C020-15TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C020-15TC requirements.
6.How does Aetrix verify that AT27C020-15TC is sourced from the original manufacturer or authorized distributors?
All AT27C020-15TC 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 AT27C020-15TC meets industry standards.
7.What is the process for return or replacement of AT27C020-15TC?
All AT27C020-15TC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C020-15TC, 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 AT27C020-15TC part is unused and in its original packaging.
Return procedure for AT27C020-15TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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