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Microchip Technology AT27C020-70TI
- Part No.:
- AT27C020-70TI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT27C020-70TI.pdf
- Description:
- IC EPROM 2MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,649
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Product details
Overview
AT27C020-70TI from Atmel is a 2-Mbit (256K × 8) one-time programmable EPROM optimized for industrial-temperature microcontroller firmware storage, featuring 70 ns read access time, 5V ±10% supply operation, and JEDEC-standard 32-lead TSOP packaging. It delivers low active current (25 mA max at 5 MHz) and ultra-low standby current (100 µA max), enabling reliable boot code retention in embedded control systems without battery backup.
For engineers reviewing the AT27C020-70TI datasheet, AT27C020-70TI pinout, AT27C020-70TI application, or AT27C020-70TI equivalent, key selection factors include industrial temperature range (-40°C to +85°C), Rapid™ programming algorithm (100 µs/byte typical), CMOS/TTL compatibility, integrated product identification code, and dual-line control (CE/OE) for bus contention management.
Technical Context
The AT27C020-70TI implements a standard OTP EPROM architecture with 18 address lines (A0–A17) supporting full 256K-byte addressing, and 8 bidirectional data outputs (O0–O7) with TTL/CMOS-compatible voltage thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V). Its two-level enable scheme (CE and OE) enables precise output gating independent of address transitions.
Programming requires elevated VPP = 13.0 V ±0.25 V and VCC = 6.5 V ±0.25 V, with a fixed 100 µs PGM pulse width and up to 10 reprogramming attempts per byte. Product identification uses A9 high-voltage strobe (11.5–12.5 V) and A0 toggling to select manufacturer (0x1E) or device code (0x86) bytes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2,097,152 bits (256K × 8) - supports full firmware images for 8-bit and 16-bit MCUs without bank switching |
| Read Access Time | 70 ns maximum - eliminates WAIT states on 14 MHz Z80, 8051, and 68K-based systems |
| Supply Voltage | 5 V ±10% - interoperable with legacy 5V logic families and microprocessor buses |
| Standby Current | 100 µA maximum - enables low-power hold mode during system sleep without external power gating |
| Operating Temperature | -40°C to +85°C - qualified for industrial automation, motor drives, and factory HMI applications |
| ESD Protection | 2,000 V HBM - withstands handling and board assembly without special ESD controls |
| Latch-up Immunity | 200 mA - prevents destructive latch-up under transient overvoltage or ground bounce |
Pinout & Package
AT27C020-70TI is supplied in a 32-lead Plastic Thin Small Outline Package (TSOP), Type 1, JEDEC MO-142 BD compliant, with 0.5 mm lead pitch and body dimensions 11.5 mm × 20.0 mm × 1.2 mm (max height).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus interface; A0–A17 fully decode 256K locations with no internal multiplexing |
| O0–O7 | Data Outputs | True TTL/CMOS-compatible outputs; drive 2.1 mA low / -400 µA high without external buffers |
| CE | Chip Enable | Primary device select; must be low for read or program; high-Z output when high |
| OE | Output Enable | Secondary output gate; allows CE assertion while holding bus idle to prevent contention |
| PGM | Program Strobe | Active-low programming control; requires 100 µs pulse width at VPP = 13 V for byte programming |
| VPP | Programming Voltage | 13.0 V ±0.25 V input during programming; must be applied after and removed before VCC |
| VCC | Power Supply | 5 V ±10% main supply; powers core logic and I/O; supplies 25 mA max at 5 MHz read rate |
| GND | Ground Reference | Common return for VCC, VPP, and signal pins; 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 by >60% vs. legacy EPROMs |
| Integrated Product ID Code | Manufacturer (0x1E) and device (0x86) codes readable via A9/A0 strobe - enables automated programmer validation |
| Two-Line Output Control (CE/OE) | Independent chip and output enables eliminate bus contention during partial memory map decoding |
| Industrial Temperature Range | -40°C to +85°C operation validated across full voltage and timing specs - suitable for uncontrolled cabinet environments |
| JEDEC-Standard Packages | 32-lead TSOP (Type 1) footprint matches industry layout standards - enables drop-in replacement in existing designs |
Applications
| Industrial PLC Firmware Storage | Automotive Engine Control Unit Boot ROM |
|---|---|
Use Scenario: Storing immutable boot firmware and calibration tables in programmable logic controllers deployed in factory-floor cabinets. IC Role / Device Role / Timing Role: Nonvolatile boot ROM providing deterministic 70 ns instruction fetch timing to 8051 or ColdFire MCU during cold start. Use Value: Eliminates reliance on external EEPROM or flash with slower write cycles; retains data >20 years without power or refresh. |
Use Scenario: Holding safety-critical engine initialization code and sensor lookup tables in Tier-1 automotive ECUs operating in under-hood environments. IC Role / Device Role / Timing Role: OTP EPROM used as primary boot image source, accessed directly by microcontroller address/data bus during power-on reset sequence. Use Value: Guarantees firmware integrity against accidental overwrite or corruption - critical for ISO 26262 ASIL-B compliance. |
| Medical Diagnostic Equipment BIOS | Legacy Industrial HMI Display Controller |
Use Scenario: Storing certified diagnostic firmware and regulatory configuration data in FDA-cleared imaging devices requiring traceable, unalterable software versions. IC Role / Device Role / Timing Role: Read-only memory mapped at fixed address space, delivering verified boot code to ARM7TDMI processor within 70 ns. Use Value: Meets IEC 62304 software lifecycle requirements by preventing field modification of safety-related code. |
Use Scenario: Providing display initialization routines and character font sets for 1990s-era industrial HMIs using Z80 or 68000 CPUs with parallel bus interfaces. IC Role / Device Role / Timing Role: Legacy-compatible EPROM replacing obsolete 27C256 or 27C512 in service-replacement PCBs. Use Value: Pin- and timing-compatible upgrade path preserving original board layout and firmware binary compatibility. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C020-70PI | Same die, 32-lead PDIP package (32P6); 0.600" width; higher thermal resistance (θJA = 65°C/W vs. TSOP's 45°C/W) | Suitable for through-hole prototyping or legacy wave-soldered assemblies where surface-mount is not feasible | Select only if mechanical constraints require DIP footprint or manual rework capability |
| AT27C020-70JI | Same die, 32-lead PLCC package (32J); J-leaded; requires socket or reflow profile compatible with plastic carrier | Preferred for high-vibration environments where gull-wing leads may fatigue; supports zero-insertion-force sockets | Choose when board-level reliability under mechanical shock exceeds TSOP's flexure limits |
Compared with AT27C020-70PI and AT27C020-70JI, the AT27C020-70TI offers superior thermal performance and smaller PCB footprint for modern SMT production, while retaining identical timing, programming, and electrical behavior - making it optimal for new industrial designs prioritizing density and manufacturability.
Availability
AT27C020-70TI is available at Aetrix Electronics and suitable for industrial automation, automotive ECU firmware, and medical diagnostic equipment requiring stable component supply across extended product lifecycles.
Supply support for AT27C020-70TI 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, designed high-reliability nonvolatile memory and microcontrollers for industrial, automotive, and communications markets before its 2016 acquisition.
The AT27C020 belongs to Atmel's 27C-series OTP EPROM family, engineered specifically for cost-sensitive, high-volume embedded systems needing tamper-proof firmware storage with guaranteed data retention and fast read access.
FAQ
What is the maximum operating temperature range for the AT27C020-70TI?
The AT27C020-70TI is rated for industrial temperature operation from -40°C to +85°C. All AC and DC specifications-including 70 ns access time, 25 mA active current, and 100 µA standby current-are guaranteed across this full range. This makes the AT27C020-70TI suitable for deployment in factory automation panels, motor control cabinets, and other unconditioned industrial environments where ambient temperatures exceed commercial-grade limits.
Does the AT27C020-70TI require a separate programming voltage during normal read operation?
No, the AT27C020-70TI operates from a single 5 V ±10% supply during read mode. VPP (13.0 V ±0.25 V) is required only during programming and must be applied after VCC and removed before VCC. In read mode, VPP is tied to VCC or left floating per design guidelines-no external high-voltage generator is needed for standard firmware execution. The AT27C020-70TI maintains full functionality with just one 5V rail in system runtime.
How does the Rapid™ Programming Algorithm improve production efficiency for the AT27C020-70TI?
The Rapid™ Programming Algorithm reduces average programming time to 100 µs per byte-over 10× faster than conventional EPROM algorithms. It uses a verify-and-reprogram loop with up to 10 pulses per failing byte, ensuring high first-pass yield. For a full 256K-byte image, total programming time is typically under 26 seconds. This accelerates firmware burn-in in manufacturing, directly lowering test floor occupancy and increasing throughput for the AT27C020-70TI in high-volume industrial PCB assembly.
Can the AT27C020-70TI be used as a direct replacement for older 27C256 or 27C512 EPROMs?
The AT27C020-70TI is not pin-compatible with 27C256 (28-pin) or 27C512 (28-pin) due to its 32-pin TSOP footprint and expanded 18-bit address bus (A0–A17 vs. A0–A15). However, it provides functional equivalence at 2 Mbit density and supports identical 5V-only read operation. Migration requires PCB layout revision to accommodate the 32-pin TSOP and updated address decoding logic-so it is a functional upgrade, not a drop-in replacement. The AT27C020-70TI replaces those parts in new designs where higher density and industrial temp are required.
What decoupling capacitance is required for stable operation of the AT27C020-70TI?
Each AT27C020-70TI requires a minimum 0.1 µF high-frequency ceramic capacitor placed between VCC and GND, mounted as close as possible to the device pins. For boards with multiple AT27C020-70TI devices or high-current digital loads, a bulk 4.7 µF electrolytic capacitor should also be added near the power entry point. These values are specified in the Atmel datasheet to suppress transients during CE switching and ensure VCC stability within ±10%-critical for maintaining the 70 ns access time and preventing read errors in the AT27C020-70TI.
AT27C020-70TI 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:
- 70 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
AT27C020-70TI FAQ
1.How can I place an order for AT27C020-70TI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C020-70TI 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 AT27C020-70TI reliable?
The price and inventory of AT27C020-70TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C020-70TI is usually 5 days.
3.What payment methods are accepted for AT27C020-70TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C020-70TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C020-70TI?
AT27C020-70TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C020-70TI 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 AT27C020-70TI?
For technical support, including AT27C020-70TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C020-70TI requirements.
6.How does Aetrix verify that AT27C020-70TI is sourced from the original manufacturer or authorized distributors?
All AT27C020-70TI 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 AT27C020-70TI meets industry standards.
7.What is the process for return or replacement of AT27C020-70TI?
All AT27C020-70TI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C020-70TI, 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 AT27C020-70TI part is unused and in its original packaging.
Return procedure for AT27C020-70TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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