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Microchip Technology AT27C020-12TI
- Part No.:
- AT27C020-12TI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT27C020-12TI.pdf
- Description:
- IC EPROM 2MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,523
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Product details
Overview
AT27C020-12TI from Atmel is a 2-Mbit (256K × 8) one-time programmable EPROM designed for firmware storage in microprocessor systems requiring fast, reliable nonvolatile memory access. 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 PLCC package. Its dual-line control (CE/OE), CMOS/TTL compatibility, and Rapid™ programming (100 µs/byte) enable drop-in integration into embedded boot code and configuration memory applications.
For engineers reviewing the AT27C020-12TI datasheet, AT27C020-12TI pinout, AT27C020-12TI application, or AT27C020-12TI equivalent, key selection criteria include verified 55 ns read timing, industrial-grade temperature operation, PLCC package mechanical fit, OTP reliability for unchangeable firmware, and compatibility with standard EPROM programmers supporting VPP = 12.0 V programming voltage.
Technical Context
The AT27C020-12TI implements a parallel-addressed OTP EPROM architecture with 18 address lines (A0–A17), 8 bidirectional data outputs (O0–O7), and dedicated control pins (CE, OE, PGM, VPP). It uses high-reliability CMOS process with 2,000V ESD protection and 200 mA latch-up immunity, enabling robust operation in industrial environments.
Its two-line enable scheme (CE active-low, OE active-low) allows precise bus contention control during read cycles. Programming requires elevated VPP (12.0 ± 0.5 V) and VCC (6.5 V), with integrated product identification code accessible via A9/VH and A0 toggling - a feature used by industry-standard programmers to auto-select correct algorithms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2,097,152 bits (256K × 8) - provides sufficient space for boot firmware, BIOS, or fixed configuration data in 8-bit microcontroller systems. |
| Read Access Time | 55 ns max - eliminates WAIT states on 5 MHz Z80, 8051, or 68K-based systems, enabling full-speed instruction fetch. |
| Supply Voltage | 5 V ±10% - compatible with standard TTL/CMOS logic rails without auxiliary regulators. |
| Standby Current | 100 µA max - enables low-power retention in always-on industrial controllers with battery backup. |
| Operating Temperature | –40°C to +85°C - certified for industrial equipment operating in factory-floor or outdoor enclosures. |
| Programming Voltage (VPP) | 12.0 ± 0.5 V - requires external high-voltage supply during programming; not used in normal read mode. |
| ESD Protection | 2,000 V HBM - ensures handling robustness during PCB assembly and field service. |
Pinout & Package
AT27C020-12TI is packaged in a 32-lead Plastic J-Leaded Chip Carrier (PLCC), JEDEC MS-016 AE compliant, with 1.27 mm pitch and 11.5 mm × 11.5 mm body size. Pin 1 is marked by index notch at corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus interface; selects one of 256K byte locations for read or program operations. |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus; outputs valid data during read when CE and OE are low; high-impedance when disabled. |
| CE | Chip Enable | Active-low global enable; places device in standby (high-Z) when high, enabling multi-chip memory decoding. |
| OE | Output Enable | Active-low output gate; controls data bus drive timing independently of CE to prevent bus contention. |
| PGM | Program Strobe | Active-low pulse input (100 µs width) that initiates byte programming when VPP is applied. |
| VPP | Programming Voltage | 12.0 V input required only during programming; must be applied after and removed before VCC per datasheet sequencing. |
| VCC | Power Supply | 5 V ±10% main supply; powers logic and outputs during read; raised to 6.5 V during programming. |
| GND | Ground | Reference return 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 programming time reduces production burn-in cycle duration and improves throughput in firmware programming stations. |
| Integrated Product ID Code | Manufacturer (0x1E) and device code (0x86) readable via A9/VH and A0 toggle - enables automatic algorithm selection in universal programmers. |
| Two-Line Control (CE/OE) | Independent chip and output enables allow precise timing control over data bus release, preventing glitches during memory-mapped I/O transitions. |
| JEDEC-Standard Packages | 32-lead PLCC footprint matches legacy board layouts; pin-compatible with other 27C-series EPROMs in same package variant. |
| Industrial Temperature Range | –40°C to +85°C operation validated across full voltage and timing specs - suitable for motor drives, PLCs, and instrumentation without derating. |
Applications
| Industrial PLC Firmware Storage | Legacy Microcontroller Boot ROM |
|---|---|
|
Use Scenario: Storing fixed ladder logic execution engine and I/O mapping tables in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Nonvolatile boot memory providing immediate, deterministic code execution at power-on without loading delays. Use Value: 55 ns access time ensures zero-wait-state instruction fetch for real-time scan-cycle execution; OTP prevents accidental overwrite during field updates. |
Use Scenario: Holding immutable startup code and hardware initialization routines for 8051 or Z80-based embedded controllers in medical analyzers. IC Role / Device Role / Timing Role: Primary read-only memory mapped at reset vector address, accessed via parallel bus with CE/OE handshaking. Use Value: Industrial temperature rating guarantees reliable boot under thermal cycling; 2,000V ESD withstand protects against assembly-line static discharge. |
| Automotive Instrument Cluster Configuration | Test Equipment Calibration Data |
|
Use Scenario: Storing calibrated display lookup tables and CAN message routing rules in dashboard ECUs operating across –40°C to +85°C ambient. IC Role / Device Role / Timing Role: Configuration memory accessed during startup to initialize LCD driver registers and backlight PWM parameters. Use Value: Verified operation at –40°C ensures cold-start functionality; OTP eliminates risk of corruption from vibration-induced write errors. |
Use Scenario: Retaining factory-calibrated ADC offset/gain coefficients and sensor linearization curves in benchtop multimeters and oscilloscopes. IC Role / Device Role / Timing Role: Read-only reference data store accessed during self-test sequence prior to measurement mode entry. Use Value: High-reliability CMOS process ensures >10-year data retention; rapid programming enables efficient calibration batch programming in manufacturing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C256B-120EC | 256K × 8 OTP EPROM with 120 ns access time; requires same 5 V supply but no VPP pin (uses internal charge pump). | Slower read speed limits use in high-clock-frequency systems; lacks VPP dependency simplifies programmer design. | Select when board layout lacks VPP routing capability and 120 ns timing suffices for target MCU bus speed. |
| MX27C256-12PC | 256K × 8 OTP EPROM with 120 ns access; identical PLCC-32 package but rated only for commercial temperature (0°C to 70°C). | Not qualified for industrial environments; lower ESD rating (1,500 V) and no automotive temp option. | Acceptable only for cost-sensitive lab or consumer-grade equipment where extended temperature operation is unnecessary. |
Compared with AM27C256B-120EC and MX27C256-12PC, the AT27C020-12TI uniquely combines 55 ns speed, industrial temperature qualification, and explicit VPP control - making it the only choice for time-critical, thermally demanding firmware storage where programming voltage sequencing must be externally managed.
Availability
AT27C020-12TI is available at Aetrix Electronics and suitable for industrial control systems, legacy embedded instrumentation, and automotive cluster modules requiring stable component supply across extended lifecycle programs.
Supply support for AT27C020-12TI 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 semiconductor manufacturer specializing in microcontrollers, nonvolatile memory, and secure authentication ICs for industrial, automotive, and consumer applications.
The AT27C020-12TI belongs to Atmel's 27C-series OTP EPROM product line, engineered for high-reliability firmware storage in systems where code immutability, fast read access, and industrial environmental resilience are mandatory design requirements.
FAQ
What is the maximum read access time specified for the AT27C020-12TI?
The AT27C020-12TI has a maximum read access time of 55 ns under industrial temperature conditions (–40°C to +85°C) and 5 V ±10% supply. This value is guaranteed across the full operating range and is measured from address valid to valid data output with both CE and OE asserted low. The "-12" suffix explicitly denotes this 55 ns speed grade, distinguishing it from slower variants like -15 (150 ns) or -90 (90 ns). This timing enables direct interfacing with 5 MHz microprocessors without wait-state insertion.
Does the AT27C020-12TI require a separate programming voltage (VPP) during normal operation?
No, the AT27C020-12TI does not require VPP during normal read operation. VPP (12.0 ± 0.5 V) is needed exclusively during programming and verification cycles. In read mode, only the 5 V ±10% VCC supply is active. The datasheet mandates strict sequencing: VPP must be applied after VCC and removed before VCC to prevent latch-up. For systems using AT27C020-12TI solely as read-only memory, VPP can remain unconnected or tied to VCC through a resistor if board layout permits - but never left floating.
Which package type does the AT27C020-12TI use, and is it pin-compatible with other 27C-series EPROMs?
The AT27C020-12TI uses a 32-lead Plastic J-Leaded Chip Carrier (PLCC), designated as package code "32J" per Atmel's ordering information. Its pinout matches JEDEC MS-016 AE standard and is functionally identical to other 27C256-class devices in PLCC-32, including AT27C256, AM27C256, and MX27C256 - provided the same address/data/control signal mapping is observed. However, VPP pin usage and programming voltage requirements differ across manufacturers, so direct substitution requires verification of programming infrastructure compatibility.
Can the AT27C020-12TI be used in automotive applications?
The AT27C020-12TI is rated for industrial temperature range (–40°C to +85°C), not the full automotive AEC-Q100 Grade 2 (–40°C to +105°C) or Grade 1 (–40°C to +125°C) specification. While its absolute maximum ratings extend to +125°C, the AC/DC parametric performance (e.g., tACC, ICC, ISB) is only guaranteed across the industrial range. For automotive instrument clusters or body control modules requiring certified automotive qualification, Atmel offers the AT27C020-12JA variant - which shares the same die but undergoes additional screening and test correlation for automotive use cases.
How does the Integrated Product Identification Code work on the AT27C020-12TI?
The AT27C020-12TI features an electronically readable ID code comprising two bytes: Manufacturer ID (0x1E) and Device Code (0x86). To access it, A9 must be driven to 12.0 V (VH), while A0 is toggled between low (to read manufacturer byte) and high (to read device byte); all other address lines (A1–A17) held low. This code is used by universal programmers like BP Microsystems or Xeltek to auto-detect the device and select correct programming algorithms, voltage profiles, and verification patterns - eliminating manual setup errors during AT27C020-12TI firmware programming.
AT27C020-12TI 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:
- 120 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TSOP
AT27C020-12TI FAQ
1.How can I place an order for AT27C020-12TI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C020-12TI 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 AT27C020-12TI reliable?
The price and inventory of AT27C020-12TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C020-12TI is usually 5 days.
3.What payment methods are accepted for AT27C020-12TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C020-12TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C020-12TI?
AT27C020-12TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C020-12TI 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 AT27C020-12TI?
For technical support, including AT27C020-12TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C020-12TI requirements.
6.How does Aetrix verify that AT27C020-12TI is sourced from the original manufacturer or authorized distributors?
All AT27C020-12TI 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 AT27C020-12TI meets industry standards.
7.What is the process for return or replacement of AT27C020-12TI?
All AT27C020-12TI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C020-12TI, 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 AT27C020-12TI part is unused and in its original packaging.
Return procedure for AT27C020-12TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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