My Inquiry
My Account
Microchip Technology AT27C020-90TC
- Part No.:
- AT27C020-90TC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT27C020-90TC.pdf
- Description:
- IC EPROM 2MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,328
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT27C020-90TC from Atmel is a 2-Mbit (256K × 8) one-time programmable EPROM optimized for fast read access in embedded firmware storage applications. It operates from a single 5V ±10% supply, delivers 90 ns read access time, consumes ≤100 µA standby current, and supports commercial temperature range (0°C to 70°C). It is commonly used in microcontroller boot code storage where non-volatility, low power, and JEDEC-standard TSOP packaging are required.
For engineers reviewing the AT27C020-90TC datasheet, AT27C020-90TC pinout, AT27C020-90TC application, or AT27C020-90TC equivalent, key selection considerations include its 32-pin TSOP package, 55–150 ns speed grading options, Rapid™ programming algorithm (100 µs/byte), CMOS/TTL compatibility, and integrated product identification code for automated programming systems.
Technical Context
The AT27C020-90TC implements a two-line control architecture using CE (Chip Enable) and OE (Output Enable) to manage bus contention and output tri-state behavior. Its address space spans A0–A17 (18-bit), supporting full 256K-byte decoding without external logic.
It uses high-reliability CMOS technology with 2,000V ESD protection and 200 mA latch-up immunity. Programming requires VPP = 13.0 V ±0.25 V and VCC = 6.5 V ±0.25 V, with a verified 100 µs PGM pulse width and up to 10 reprogramming attempts per byte during Rapid™ verification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2,097,152 bits (256K × 8); stores full microcontroller boot firmware or configuration data without external expansion. |
| Read Access Time | 90 ns max; eliminates WAIT states on 5 MHz–12 MHz microprocessor buses. |
| Supply Voltage | 5V ±10%; compatible with standard TTL/CMOS logic rails and legacy 5V system designs. |
| Standby Current | 100 µA max; enables low-power hold mode in battery-backed or energy-sensitive systems. |
| Active Current | 25 mA max at 5 MHz; supports sustained burst reads without thermal derating in compact PCB layouts. |
| Programming Speed | 100 µs/byte typical; reduces production programming cycle time by >5× vs. conventional EPROM algorithms. |
| Operating Temperature | 0°C to 70°C (Commercial); validated for industrial control panels and office equipment environments. |
Pinout & Package
AT27C020-90TC is packaged 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 11.8 × 10.0 mm. Pin 1 is marked by a beveled corner and index notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit parallel address bus; fully decodes 256K locations; no address multiplexing required. |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus in read mode; high-impedance when CE or OE is inactive. |
| CE | Chip Enable | Active-low global enable; controls device selection in multi-chip memory maps. |
| OE | Output Enable | Active-low output gate; allows shared bus operation without external transceivers. |
| PGM | Program Strobe | Active-low pulse input for byte programming; requires precise 95–105 µs width at VPP = 13 V. |
| VPP | Programming Voltage | 13.0 V ±0.25 V input during programming; must be applied after VCC and removed before VCC. |
| VCC | Power Supply | +5V ±10% main supply; powers both read and program modes (6.5 V during programming). |
| GND | Ground Reference | Common return path; requires local 0.1 µF ceramic decoupling per device per datasheet layout guidance. |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | Reduces production programming time via 100 µs/byte pulses and automatic verify-reprogram loops per byte. |
| Integrated Product ID Code | Two-byte electronic signature (0x1E manufacturer + 0x86 device) enables auto-detection in universal programmers. |
| JEDEC-Standard TSOP Packaging | 32T footprint ensures drop-in compatibility with existing 32-pin EPROM sockets and automated assembly lines. |
| CMOS/TTL I/O Compatibility | Accepts and drives standard 5V logic levels without level shifters-simplifies interface to 8051, Z80, or 68K families. |
| High-Reliability Process | 2,000V HBM ESD rating and 200 mA latch-up immunity support robust operation in noisy industrial environments. |
Applications
| Industrial PLC Firmware Storage | Legacy PC BIOS Modules |
|---|---|
|
Use Scenario: Storing fixed ladder logic and I/O mapping tables in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Non-volatile boot ROM providing deterministic startup execution without disk latency. Use Value: 90 ns access time ensures real-time response to sensor inputs; 100 µA standby current extends uptime during brown-out conditions. |
Use Scenario: Holding POST routines and hardware initialization code in early-generation desktop motherboards. IC Role / Device Role / Timing Role: Primary firmware image storage accessed directly by x86 CPU during cold boot sequence. Use Value: JEDEC-standard TSOP-32 footprint enables direct replacement of prior 27C256/27C512 devices; 5V-only read operation simplifies power design. |
| Medical Diagnostic Equipment Boot Memory | Point-of-Sale Terminal Configuration Storage |
|
Use Scenario: Retaining calibration constants and safety-critical startup diagnostics in ultrasound and ECG analyzers. IC Role / Device Role / Timing Role: OTP EPROM ensuring firmware immutability and regulatory compliance for Class II medical devices. Use Value: One-time programmability prevents accidental overwrites; 2,000V ESD protection withstands clinical environment handling. |
Use Scenario: Storing localized language strings, tax tables, and peripheral driver configurations in retail POS terminals. IC Role / Device Role / Timing Role: Field-programmable configuration store updated during depot servicing, not end-user operation. Use Value: Rapid™ programming allows batch reconfiguration in <1 second per unit; PLCC/TSOP variants support both manual and SMT rework. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C256B-15PU | 32K × 8 (256 Kbit), 150 ns access, PDIP-28 package, no VPP pin (5V-only programming) | Lower density; suited for smaller boot images; lacks Rapid™ algorithm and ID code | Select when board space permits larger DIP footprint and firmware size ≤32 KB. |
| MX27C256AP-12 | 32K × 8 (256 Kbit), 120 ns access, PDIP-28, requires 12.5 V VPP, no integrated ID code | Same density but slower; no product identification feature; limited temperature grade (0°C–70°C only) | Choose only if legacy MX27C256A tooling exists and Rapid™ programming is unnecessary. |
Compared with AT27C256B-15PU and MX27C256AP-12, the AT27C020-90TC offers 8× higher density (256K vs. 32K), faster 90 ns access, TSOP packaging for space-constrained designs, and built-in Rapid™ programming and ID code-making it optimal for modern 5V embedded firmware storage where capacity, speed, and production efficiency matter.
Availability
AT27C020-90TC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy PC BIOS modules, and medical diagnostic equipment boot memory requiring stable component supply across extended production lifecycles.
Supply support for AT27C020-90TC 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, non-volatile memory, and secure authentication ICs.
The AT27C020 belongs to Atmel's OTP EPROM product line, designed specifically for reliable, cost-effective, field-programmable firmware storage in 5V systems where data integrity and long-term retention are critical.
FAQ
What is the maximum operating temperature range for the AT27C020-90TC?
The AT27C020-90TC is rated for commercial operation from 0°C to 70°C. This range is explicitly defined in the Ordering Information table for the "-90TC" suffix and validated across all AC and DC parameters in the datasheet. The device is not qualified for industrial (−40°C to +85°C) or automotive (−40°C to +125°C) ranges unless ordered with "-90TI" or "-90TA" suffixes. AT27C020-90TC must be used within its specified case temperature limits to guarantee timing, current, and reliability performance.
Does the AT27C020-90TC require a separate programming voltage (VPP) during normal read operation?
No, the AT27C020-90TC operates from a single 5V supply during read mode. VPP (13.0 V ±0.25 V) is required only during programming and verification cycles. In read mode, VPP may be tied to VCC (5V) per datasheet Note 2, and the device draws ≤25 mA active current. Applying 13 V to VPP during read will damage the device. AT27C020-90TC's dual-supply requirement is strictly confined to programming sessions.
How does the Rapid™ Programming Algorithm improve production throughput for the AT27C020-90TC?
The Rapid™ Programming Algorithm reduces average programming time to ~100 µs per byte by combining single-pulse initial programming with an intelligent verify-reprogram loop that applies up to 10 additional pulses only to failing bytes. This avoids uniform full-array reprogramming, cutting total write time by >5× versus legacy EPROM algorithms. For a full 256K-byte AT27C020-90TC, this yields typical programming durations under 30 seconds-critical for high-volume firmware loading. AT27C020-90TC's algorithm is implemented in hardware and requires no host-side software overhead.
Can the AT27C020-90TC be used as a direct replacement for the AT27C256B in an existing design?
No, the AT27C020-90TC is not a pin-compatible or functional drop-in replacement for the AT27C256B. The AT27C256B is a 32K × 8 (256 Kbit) device in a 28-pin package with A0–A14 addressing, while the AT27C020-90TC is a 256K × 8 (2 Mbit) device in a 32-pin TSOP with A0–A17 addressing. Pin count, address bus width, package outline, and VPP requirements differ fundamentally. Replacing AT27C256B with AT27C020-90TC requires PCB layout revision and firmware address map updates.
What decoupling capacitance is required for stable operation of the AT27C020-90TC?
The AT27C020-90TC requires a minimum 0.1 µF high-frequency ceramic capacitor connected between VCC and GND, placed as close as possible to the device pins. For boards with multiple EPROMs or high-noise environments, a 4.7 µF bulk electrolytic capacitor should also be added near the power entry point. These values are mandated in the "System Considerations" section to suppress transient excursions during CE switching and ensure VCC remains within ±10% tolerance. Omitting either capacitor risks timing violations or device malfunction in the AT27C020-90TC.
AT27C020-90TC 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:
- 90 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
AT27C020-90TC FAQ
1.How can I place an order for AT27C020-90TC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C020-90TC 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 AT27C020-90TC reliable?
The price and inventory of AT27C020-90TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C020-90TC is usually 5 days.
3.What payment methods are accepted for AT27C020-90TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C020-90TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C020-90TC?
AT27C020-90TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C020-90TC 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 AT27C020-90TC?
For technical support, including AT27C020-90TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C020-90TC requirements.
6.How does Aetrix verify that AT27C020-90TC is sourced from the original manufacturer or authorized distributors?
All AT27C020-90TC 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 AT27C020-90TC meets industry standards.
7.What is the process for return or replacement of AT27C020-90TC?
All AT27C020-90TC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C020-90TC, 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 AT27C020-90TC part is unused and in its original packaging.
Return procedure for AT27C020-90TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT27C020-90TC Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
