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Microchip Technology AT27C040-90TI
- Part No.:
- AT27C040-90TI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT27C040-90TI.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,548
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Product details
Overview
AT27C040-90TI from Atmel is a 4-Mbit (512K × 8) one-time programmable EPROM designed for nonvolatile program storage in microprocessor systems. It operates on a single 5V ±10% supply, delivers 90 ns read access time, supports industrial temperature range (–40°C to +85°C), and features dual-line control (CE/OE) to prevent bus contention in high-speed embedded applications.
For engineers reviewing the AT27C040-90TI datasheet, AT27C040-90TI pinout, AT27C040-90TI application, or AT27C040-90TI equivalent, this page provides verified package mapping (32-lead PLCC), confirmed Rapid™ programming algorithm (100 µs/byte), JEDEC-standard timing parameters, ESD/latchup immunity specs, and real-world use context for legacy system upgrades and firmware boot memory.
Technical Context
The AT27C040-90TI implements a CMOS-based OTP EPROM architecture with 19 address lines (A0–A18) and 8 bidirectional data outputs (O0–O7), enabling direct byte-level access without WAIT states. Its two-control-line interface (CE and OE) decouples chip selection from output gating, supporting clean bus arbitration in multiprocessor or shared-memory environments.
Programming relies on external VPP = 13.0 V ±0.25 V applied during CE-pulsed Rapid™ algorithm execution, while read mode requires only VCC = 5 V. The integrated product identification code (Manufacturer ID = 0x1E, Device ID = 0x0B) enables automatic algorithm selection in industry-standard programmers via A9 high-voltage (11.5–12.5 V) and A0 toggling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4,194,304-bit (512K × 8) - supports full 16-bit or 8-bit microprocessor data buses without banking logic |
| Read Access Time | 90 ns max - eliminates WAIT states on 11 MHz Z80, 80C88, or 68000-based systems |
| Supply Voltage | 5 V ±10% - compatible with standard TTL/CMOS logic rails; no auxiliary voltage required for read operation |
| Standby Current | 100 µA max (CMOS CE) - enables low-power retention in battery-backed or intermittent-use embedded controllers |
| Programming Voltage | VPP = 13.0 V ±0.25 V - requires dedicated programming hardware; not used during normal system operation |
| ESD Protection | 2000 V HBM - ensures robustness during manual handling and board assembly in industrial environments |
| Latchup Immunity | 200 mA - prevents destructive latchup under transient overvoltage or ground bounce conditions |
Pinout & Package
AT27C040-90TI is supplied in a 32-lead Plastic Leaded Chip Carrier (PLCC) package per JEDEC MS-016, Variation AE, with pin 1 marked by corner notch. This surface-mount package supports reflow soldering and offers superior thermal performance vs. PDIP in dense PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus interface; fully decoded internally - no external address latching required |
| O0–O7 | Data Outputs | CMOS/TTL-compatible 8-bit bidirectional data path; high-impedance when CE or OE inactive |
| CE | Chip Enable | Active-low global enable; controls device power state and output driver activation |
| OE | Output Enable | Active-low output gate; allows multiple devices on same data bus without contention |
| VPP | Programming Voltage | 13 V input during programming only; must be disconnected or tied to VCC during read operation |
| VCC | Power Supply | +5 V main supply; must be applied before/removed after VPP to prevent damage |
| GND | Ground Reference | Common return for all signals and supplies; requires local 0.1 µF ceramic decoupling |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical - reduces full-device programming time to under 5 minutes, enabling rapid firmware iteration in production test |
| Integrated Product ID Code | Manufacturer ID 0x1E + Device ID 0x0B - enables auto-detection and algorithm matching in universal programmers without manual setup |
| Dual-Line Control (CE/OE) | Independent chip select and output gating - permits interleaved access across multiple EPROMs or mixed memory types on same bus |
| Industrial Temperature Range | –40°C to +85°C - qualified for deployment in factory automation, telecom line cards, and transportation control units |
| JEDEC Standard Packages | 32-lead PLCC (32J) - ensures compatibility with existing socket footprints and automated assembly processes |
Applications
| Industrial PLC Firmware Storage | Legacy Microcontroller Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic and I/O configuration in programmable logic controllers deployed in manufacturing cells. IC Role / Device Role / Timing Role: Nonvolatile boot memory providing deterministic startup sequence and runtime instruction fetch at ≤11 MHz clock rates. Use Value: 90 ns access time ensures zero WAIT-state execution of critical motion control loops; industrial temp rating guarantees reliability in unconditioned cabinet environments. |
Use Scenario: Hosting BIOS and peripheral initialization code for Z80- or 80C88-based embedded controllers in medical analyzers and lab instruments. IC Role / Device Role / Timing Role: Primary boot ROM mapped to reset vector space; accessed during cold start and watchdog recovery sequences. Use Value: Single 5 V supply simplifies power design; 2000 V ESD protection withstands repeated technician handling during field service and calibration. |
| Telecom Line Card Configuration | Avionics System Initialization Memory |
Use Scenario: Storing protocol stacks and channel provisioning tables in T1/E1 line interface units operating in central office environments. IC Role / Device Role / Timing Role: Read-only configuration store accessed during card power-up and hot-swap initialization. Use Value: 100 µA standby current minimizes backplane loading; PLCC package supports conformal coating for humidity resistance. |
Use Scenario: Holding flight-critical boot firmware and sensor calibration constants in airborne data acquisition modules certified to DO-254 Level A. IC Role / Device Role / Timing Role: Immutable startup image ensuring deterministic boot integrity prior to FPGA configuration and ADC initialization. Use Value: OTP architecture prevents accidental overwrite; 200 mA latchup immunity protects against transients induced by aircraft power switching events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C040-90DC | Same 4-Mbit (512K × 8) OTP EPROM; 90 ns access; 5 V supply; but uses 32-lead PDIP (32P6) instead of PLCC | Through-hole mounting only; higher profile and lower thermal dissipation than PLCC | Select if legacy through-hole assembly is required and board real estate allows 0.600" wide DIP footprint |
| MX27C4001-90PC | 4-Mbit OTP EPROM with identical 90 ns access and 5 V supply; differs in programming voltage (12.5 V vs. 13.0 V) and ID code structure | Requires updated programmer firmware for ID recognition; minor AC timing variances in tDF and tOH | Choose only after verifying compatibility with existing programming infrastructure and timing margin analysis in target system |
Compared with AM27C040-90DC and MX27C4001-90PC, the AT27C040-90TI uniquely combines industrial temperature qualification, PLCC packaging for SMT scalability, and Rapid™ programming support-making it optimal for new designs requiring surface-mount integration and fast firmware turnaround.
Availability
AT27C040-90TI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy microcontroller boot ROM, and telecom line card configuration requiring stable component supply across extended lifecycle programs.
Supply support for AT27C040-90TI 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 RF solutions before its acquisition by Microchip Technology in 2016.
The AT27C040-90TI belongs to Atmel's OTP EPROM product line, engineered for reliable, cost-effective firmware and configuration storage in industrial, telecom, and embedded systems where code immutability and long-term data retention are critical.
FAQ
What is the maximum operating temperature range for the AT27C040-90TI?
The AT27C040-90TI is rated for industrial temperature operation from –40°C to +85°C. This specification is validated per the datasheet's Operating Conditions table and applies to both read and standby modes. The AT27C040-90TI maintains full timing compliance and data retention within this range, making it suitable for deployment in factory-floor controllers and outdoor telecom equipment.
Does the AT27C040-90TI require a separate programming voltage during normal operation?
No, the AT27C040-90TI requires only a single 5 V ±10% supply (VCC) for read and standby operation. The VPP pin (13.0 V ±0.25 V) is used exclusively during programming and must be disconnected or tied to VCC during system runtime. Applying VPP during read mode may cause functional failure or permanent damage to the AT27C040-90TI.
How many address lines does the AT27C040-90TI have, and what memory organization do they support?
The AT27C040-90TI has 19 address lines (A0–A18), supporting a 512K × 8-bit organization totaling 4,194,304 bits. This maps directly to 524,288 bytes of contiguous address space, enabling seamless integration with 16-bit and 32-bit microprocessors using standard address decoding without bank switching logic.
Can the AT27C040-90TI be used as a drop-in replacement for the AT27C040-90PI?
No, the AT27C040-90TI and AT27C040-90PI are not drop-in replacements due to differing packages: the AT27C040-90TI uses a 32-lead PLCC (32J), while the AT27C040-90PI uses a 32-lead PDIP (32P6). Pin functions are identical, but mechanical fit, thermal characteristics, and PCB layout are incompatible without redesign.
What is the purpose of the Integrated Product Identification Code in the AT27C040-90TI?
The Integrated Product Identification Code in the AT27C040-90TI provides Manufacturer ID (0x1E) and Device ID (0x0B) bytes readable via A9 high-voltage (11.5–12.5 V) and A0 toggling. This enables automatic detection and algorithm selection in industry-standard programmers, eliminating manual part selection errors and ensuring correct VPP timing and verification sequences for the AT27C040-90TI.
AT27C040-90TI 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:
- 4Mbit
- Memory Organization:
- 512K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- -
- Access Time:
- 90 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
AT27C040-90TI FAQ
1.How can I place an order for AT27C040-90TI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C040-90TI 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 AT27C040-90TI reliable?
The price and inventory of AT27C040-90TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C040-90TI is usually 5 days.
3.What payment methods are accepted for AT27C040-90TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C040-90TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C040-90TI?
AT27C040-90TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C040-90TI 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 AT27C040-90TI?
For technical support, including AT27C040-90TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C040-90TI requirements.
6.How does Aetrix verify that AT27C040-90TI is sourced from the original manufacturer or authorized distributors?
All AT27C040-90TI 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 AT27C040-90TI meets industry standards.
7.What is the process for return or replacement of AT27C040-90TI?
All AT27C040-90TI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C040-90TI, 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 AT27C040-90TI part is unused and in its original packaging.
Return procedure for AT27C040-90TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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