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Microchip Technology AT27C020-55TC
- Part No.:
- AT27C020-55TC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT27C020-55TC.pdf
- Description:
- IC EPROM 2MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,816
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Product details
Overview
AT27C020-55TC from Atmel is a 2-Mbit (256K × 8) one-time programmable EPROM with 55 ns read access time, 5V ±10% supply operation, and JEDEC-standard 32-lead TSOP package. It delivers TTL/CMOS-compatible I/O, rapid 100 µs/byte programming, and supports microprocessor systems requiring zero-wait-state firmware storage in industrial temperature range (–40°C to +85°C).
For engineers reviewing the AT27C020-55TC datasheet, AT27C020-55TC pinout, AT27C020-55TC application, or AT27C020-55TC equivalent, key selection criteria include verified 55 ns tACC timing, VPP = 13.0 V programming voltage, dual-line control (CE/OE), integrated product identification code, and TSOP-32 mechanical compatibility for space-constrained embedded designs.
Technical Context
The AT27C020-55TC implements a two-line enable architecture (CE and OE) to eliminate bus contention during read cycles, with CE controlling chip-level activation and OE enabling output drivers independently. Its address space spans A0–A17 (18-bit), supporting full 256K-byte decoding without external logic.
Programming uses Atmel's Rapid™ algorithm with 100 µs PGM pulses at VCC = 6.5 V and VPP = 13.0 V, followed by verify-reprogram loops per byte. Product identification is accessed via A9 = 12.0 V and A0 toggling, returning manufacturer ID (0x1E) and device code (0x86) on D0–D7.
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 - enables direct connection to 12–18 MHz microprocessors without wait states |
| Supply Voltage | 5V ±10% - compatible with standard TTL/CMOS logic rails and eliminates need for auxiliary regulators |
| Standby Current | 100 µA max - reduces system power budget in sleep modes of portable or battery-backed equipment |
| Active Current | 25 mA max at 5 MHz - defines thermal and PCB trace design margins for sustained read bursts |
| Programming Voltage | VPP = 13.0 V ±0.25 V - requires dedicated high-voltage circuitry or programmer support, not supplied by host MCU |
| ESD Protection | 2,000 V HBM - ensures robustness during manual handling and board assembly in non-EPA environments |
Pinout & Package
AT27C020-55TC is housed in a 32-lead Plastic Thin Small Outline Package (TSOP, JEDEC MO-142 BD), 11.8 mm × 10.0 mm footprint, 1.0 mm max height, gull-wing leads, 0.5 mm pitch. Pin 1 marked by notch or dot; lead finish is matte tin.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus interface; fully decoded to select one of 256K bytes; no internal latching |
| O0–O7 | Data Outputs | CMOS/TTL-compatible bidirectional data bus outputs; high-impedance when OE or CE inactive |
| CE | Chip Enable | Active-low global chip select; must be asserted before OE to avoid bus contention and transient overshoot |
| OE | Output Enable | Active-low output gate; allows shared data bus usage with other peripherals without disabling CE |
| PGM | Program Strobe | Active-low pulse input (100 µs width) that initiates byte programming when VPP = 13.0 V is applied |
| VPP | Programming Voltage | 13.0 V input required only during programming; must be applied after and removed before VCC per sequencing rules |
| VCC | Power Supply | 5V ±10% main supply; powers core logic and I/O; requires 0.1 µF ceramic decoupling at pin |
| GND | Ground Reference | Signal and power ground return; must be low-inductance path to minimize noise coupling during fast transitions |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time reduces production burn-in cycle duration and increases programmer throughput |
| Integrated Product Identification Code | Electronic ID (0x1E/0x86) enables automatic algorithm selection in universal programmers, eliminating manual part setup errors |
| Two-Line Control (CE/OE) | Independent chip and output enables allow flexible bus arbitration in multi-peripheral systems without additional logic |
| 200 mA Latch-up Immunity | Guarantees immunity to destructive latch-up events under transient overvoltage or ESD stress in industrial environments |
| Commercial/Industrial Temp Ranges | Rated for –40°C to +85°C operation - validated for use in motor drives, PLCs, and instrumentation without derating |
Applications
| Industrial PLC Firmware Storage | Automotive Instrument Cluster Boot Code |
|---|---|
Use Scenario: Storing fixed ladder logic and I/O mapping tables in programmable logic controllers deployed in factory automation cabinets. IC Role / Device Role / Timing Role: Nonvolatile firmware ROM providing deterministic 55 ns read latency to meet real-time scan cycle deadlines. Use Value: Eliminates reliance on slower serial EEPROM or flash, ensuring sub-microsecond instruction fetch for deterministic control loop execution. |
Use Scenario: Holding boot firmware and gauge calibration constants in automotive digital instrument clusters operating across –40°C to +125°C ambient. IC Role / Device Role / Timing Role: OTP EPROM delivering guaranteed read reliability without wear-out concerns during vehicle lifetime. Use Value: Avoids flash endurance limitations and write-disturb risks while meeting AEC-Q100 Grade 2 temperature requirements. |
| Medical Diagnostic Equipment BIOS | Legacy Industrial HMI Display Controller |
Use Scenario: Storing boot loader and safety-critical initialization routines in FDA-class II diagnostic imaging devices requiring long-term data retention. IC Role / Device Role / Timing Role: Immutable firmware storage element with 2,000 V ESD protection for ESD-safe assembly and field service. Use Value: Ensures firmware integrity over 10+ year product lifecycles without risk of accidental overwrite or bit corruption. |
Use Scenario: Providing display character sets and UI state machine code in panel-mounted HMIs using 8051 or Z80-based controllers. IC Role / Device Role / Timing Role: Memory-mapped parallel ROM interfaced directly to 8-bit address/data buses with no glue logic. Use Value: Enables zero-wait-state operation at 12 MHz CPU clock, preserving legacy hardware architecture without redesign. |
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, 32-lead PDIP (0.600" wide) package - larger footprint, through-hole mounting | Suitable for prototyping, repair, or legacy through-hole PCBs; incompatible with surface-mount TSOP layouts | Select when manual rework, socketing, or compatibility with existing DIP-based schematics is required |
| AT27C020-55JI | Same die, 32-lead PLCC package - J-leaded, surface-mount, 1.27 mm pitch, 11.5 mm × 11.5 mm body | Offers higher I/O density than TSOP but requires reflow profile compatible with plastic carrier; different thermal mass | Choose for designs needing higher pin count density than TSOP or where PLCC sockets are standardized |
Compared with AT27C020-55PC and AT27C020-55JI, the AT27C020-55TC provides the smallest PCB area (11.8 × 10.0 mm), lowest profile (1.0 mm), and best thermal dissipation for high-density industrial boards - making it optimal for modern SMT production where space and height are constrained.
Availability
AT27C020-55TC is available at Aetrix Electronics and suitable for industrial control systems, automotive instrumentation, medical diagnostics, and legacy embedded upgrades requiring stable component supply and long-term obsolescence management.
Supply support for AT27C020-55TC 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, nonvolatile memory, and secure authentication ICs for industrial, automotive, and consumer applications.
The AT27C020 belongs to Atmel's OTP EPROM product line, designed specifically for cost-sensitive, high-reliability firmware storage in systems where code immutability, long-term data retention, and deterministic timing outweigh reprogrammability needs.
FAQ
What is the maximum operating temperature range for the AT27C020-55TC?
The AT27C020-55TC is rated for industrial temperature operation from –40°C to +85°C. This range is validated per the datasheet's DC and AC operating conditions table and applies to all read, standby, and output-enable functions. The device does not support automotive-grade (–40°C to +125°C) operation - that variant is designated AT27C020-55TA or AT27C020-55PA.
Can the AT27C020-55TC be programmed in-circuit?
No, the AT27C020-55TC cannot be reliably programmed in-circuit. Programming requires VPP = 13.0 V ±0.25 V applied to the VPP pin, which is not present in standard 5V system rails. Additionally, the datasheet mandates strict power sequencing (VCC applied before VPP, removed after), and specifies a 0.1 µF capacitor between VPP and GND - conditions impractical to meet on most live boards. Programming must be performed using a dedicated EPROM programmer.
What is the purpose of the PGM pin on the AT27C020-55TC?
The PGM pin on the AT27C020-55TC is an active-low program strobe input used exclusively during programming. When asserted (low) with VPP = 13.0 V applied, it triggers a 100 µs pulse that writes one byte at the current address. It has no function during read or standby modes and must remain high (VIH ≥ 2.0 V) in normal operation to prevent accidental programming.
Does the AT27C020-55TC support byte-level erase or reprogramming?
No, the AT27C020-55TC is a one-time programmable (OTP) EPROM. Once a byte is programmed (i.e., a bit is changed from '1' to '0'), it cannot be reverted to '1'. There is no erase function - UV erasure is not supported, and electrical erasure is impossible. The device is intended for final firmware images where code stability and tamper resistance are critical.
How is the Integrated Product Identification Code accessed on the AT27C020-55TC?
The Integrated Product Identification Code on the AT27C020-55TC is accessed by setting A9 = 12.0 V (VID), holding A1–A17 = VIL, and toggling A0: low (VIL) returns the Manufacturer ID (0x1E), high (VIH) returns the Device Code (0x86). This occurs during a standard read cycle with CE = OE = VIL and VPP = 13.0 V - no special command sequence is needed beyond correct voltage and address conditions.
AT27C020-55TC 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:
- 55 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
AT27C020-55TC FAQ
1.How can I place an order for AT27C020-55TC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C020-55TC 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 AT27C020-55TC reliable?
The price and inventory of AT27C020-55TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C020-55TC is usually 5 days.
3.What payment methods are accepted for AT27C020-55TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C020-55TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C020-55TC?
AT27C020-55TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C020-55TC 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 AT27C020-55TC?
For technical support, including AT27C020-55TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C020-55TC requirements.
6.How does Aetrix verify that AT27C020-55TC is sourced from the original manufacturer or authorized distributors?
All AT27C020-55TC 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 AT27C020-55TC meets industry standards.
7.What is the process for return or replacement of AT27C020-55TC?
All AT27C020-55TC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C020-55TC, 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 AT27C020-55TC part is unused and in its original packaging.
Return procedure for AT27C020-55TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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