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Microchip Technology AT27C040-90JI
- Part No.:
- AT27C040-90JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT27C040-90JI.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,227
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Product details
Overview
AT27C040-90JI 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, draws ≤100 µA standby current, and supports industrial temperature range (–40°C to +85°C) in a 32-lead PLCC package. It is used in firmware boot code storage for legacy industrial controllers.
For engineers reviewing the AT27C040-90JI datasheet, AT27C040-90JI pinout, AT27C040-90JI application, or AT27C040-90JI equivalent, key selection criteria include verified 90 ns tACC timing, industrial-grade VPP programming voltage tolerance (12.0 V ±0.5 V), JEDEC-standard PLCC mechanical compatibility, and Rapid™ algorithm support for 100 µs/byte programming.
Technical Context
The AT27C040-90JI implements a CMOS-based OTP EPROM architecture with dual-line control (CE/OE) to prevent bus contention during high-speed read cycles. Its address decoding covers A0–A18 (19-bit), enabling full 512K-byte addressing without external latching.
It uses Atmel's scaled CMOS process for low-power operation: typical active current is 8 mA at 5 MHz, and standby current remains below 10 µA. Programming requires VPP = 13.0 V ±0.25 V and VCC = 6.5 V ±0.25 V, with a 100 µs CE pulse width per byte under the Rapid™ algorithm.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4,194,304 bits (512K × 8); supports full 19-bit address space for boot ROM applications |
| Read Access Time (tACC) | 90 ns max; eliminates WAIT states in 80C188/80C186-class embedded systems |
| Supply Voltage | 5 V ±10%; compatible with standard TTL/CMOS logic rails without regulation overhead |
| Standby Current (ISB1) | 100 µA max (CMOS CE); enables low-power retention in always-on industrial modules |
| Programming Voltage (VPP) | 12.0 V ±0.5 V (ID mode), 13.0 V ±0.25 V (program); requires dedicated HV supply sequencing |
| Operating Temperature | –40°C to +85°C; qualified for industrial control cabinets and motor drive environments |
| ESD Protection | 2000 V HBM; withstands handling in unshielded manufacturing and field-repair workflows |
Pinout & Package
AT27C040-90JI is packaged in a 32-lead Plastic J-Leaded Chip Carrier (PLCC), JEDEC MS-016 variation AE, with 1.27 mm pitch and 11.5 mm × 14.0 mm body size. Pin 1 is marked by a corner notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus interface; fully decoded internally-no external address latch required |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus; TTL/CMOS-compatible output levels (VOH ≥2.4 V, VOL ≤0.4 V) |
| CE | Chip Enable | Active-low chip select; controls device power state and output driver enable |
| OE | Output Enable | Active-low output gate; allows shared bus operation with other memory/peripheral devices |
| VPP | Programming Voltage | 12–13 V input for OTP programming; must be sequenced after VCC and before removal |
| VCC | Power Supply | +5 V ±10% main supply; powers logic and output drivers during read and program modes |
| GND | Ground Reference | Signal and power return; requires local 0.1 µF ceramic decoupling per device |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time; reduces firmware update cycle time in production programming stations |
| Integrated Product Identification Code | Manufacturer ID (0x1E) and Device Code (0x0B) readable via A9/VH and A0 toggle; enables auto-algorithm selection in universal programmers |
| Two-Line Control Architecture | Independent CE and OE inputs; prevents bus contention and supports interleaved memory access in multi-chip systems |
| High-Reliability CMOS Process | 200 mA latchup immunity and 2000 V ESD protection; sustains operation in electrically noisy factory-floor environments |
| JEDEC-Standard PLCC Packaging | 32J footprint; ensures drop-in replacement compatibility with legacy PCB layouts using Atmel's AT27C040-90JC/PI variants |
Applications
| Industrial PLC Firmware Storage | Legacy Medical Device Boot ROM |
|---|---|
Use Scenario: Storing fixed initialization routines and safety-critical diagnostic code in programmable logic controllers deployed in factory automation lines. IC Role / Device Role / Timing Role: Nonvolatile boot memory mapped to CPU reset vector; accessed during cold start and watchdog recovery sequences. Use Value: 90 ns tACC ensures deterministic boot timing under worst-case temperature and voltage conditions across –40°C to +85°C. | Use Scenario: Holding immutable BIOS and calibration tables in Class II medical analyzers requiring long-term data integrity without battery backup. IC Role / Device Role / Timing Role: OTP EPROM providing tamper-resistant, write-once configuration storage; immune to accidental overwrite during service mode. Use Value: Integrated product ID code (0x1E/0x0B) enables automated verification during regulatory requalification testing. |
| Avionics Maintenance Terminal Memory | Test Equipment Firmware Repository |
Use Scenario: Hosting diagnostic firmware and aircraft-specific configuration data in portable line-replaceable maintenance terminals used on commercial aircraft ramps. IC Role / Device Role / Timing Role: Read-only program memory interfaced to 80C186 derivatives; selected via CS0/CS1 decode logic. Use Value: Industrial temperature rating and 2000 V ESD rating ensure reliability during frequent hot-plug operations in uncontrolled ambient conditions. | Use Scenario: Storing self-test algorithms and instrument calibration constants in benchtop ATE platforms used for semiconductor wafer probing. IC Role / Device Role / Timing Role: Fixed-function firmware store accessed during power-up and periodic recalibration cycles. Use Value: 100 µA max standby current minimizes thermal load in densely packed test head enclosures with limited airflow. |
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 density and 90 ns speed, but AMD-manufactured; requires 12.5 V VPP (±0.25 V) vs. Atmel's 12.0 V (±0.5 V) | Identical industrial temperature range and PLCC packaging; minor VPP tolerance difference affects programmer voltage calibration | Select when sourcing from AMD-dedicated supply chains or where cross-programmer compatibility with AMD tools is required |
| MX27C4001-90PC | Macronix variant with identical 512K × 8 organization and 90 ns tACC; specifies 13.0 V ±0.3 V VPP and 35 mA ICC active current (vs. 30 mA) | Available in PDIP only (32P6); lacks PLCC option - requires PCB redesign if replacing AT27C040-90JI directly | Choose for cost-sensitive PDIP-based designs where PLCC socketing is not required and layout change is acceptable |
Compared with AM27C040-90DC and MX27C4001-90PC, the AT27C040-90JI offers tighter VPP voltage tolerance (±0.5 V), guaranteed PLCC mechanical compatibility, and integrated product ID code support - critical for automated programming validation in high-mix industrial firmware lines.
Availability
AT27C040-90JI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy medical device boot ROM, and avionics maintenance terminal memory requiring stable component supply over extended production lifecycles.
Supply support for AT27C040-90JI 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 company specializing in microcontrollers, nonvolatile memory, and analog products before its acquisition by Microchip Technology in 2016.
The AT27C040 belongs to Atmel's OTP EPROM product line, engineered for reliable, low-power, pin-compatible firmware storage in industrial and automotive control systems where data immutability and long-term retention are mandatory.
FAQ
What is the maximum allowable VPP voltage for programming the AT27C040-90JI?
The AT27C040-90JI requires VPP = 13.0 V ±0.25 V during programming, with absolute maximum rating of +14.0 V. Exceeding this risks oxide breakdown and permanent device failure. The identification mode uses VPP = 12.0 V ±0.5 V applied to A9. Always sequence VCC before VPP and remove VPP before VCC per datasheet Section 4.
Does the AT27C040-90JI support read operations while VPP is connected?
No. The AT27C040-90JI must have VPP disconnected or held at 5 V during normal read mode. If VPP remains at programming voltage during read, internal circuitry may malfunction or draw excessive current. Per datasheet Section 4, VPP should be tied to VCC only during read - never left floating or at 12–13 V.
Can the AT27C040-90JI be used as a direct replacement for the AT27C040-70JI in an existing design?
Yes, the AT27C040-90JI is functionally and pin-compatible with the AT27C040-70JI. Both share identical pinout, DC characteristics, and programming algorithm. The only difference is read access time: 90 ns vs. 70 ns. System timing margins must accommodate the slower access - verify tACC compliance in worst-case setup/hold paths.
How is the Integrated Product Identification Code accessed on the AT27C040-90JI?
To read the ID code on the AT27C040-90JI, hold all address lines A1–A18 low, set A9 to 12.0 V ±0.5 V (VH), toggle A0 between low and high, and assert CE = OE = VIL. O7–O0 will output Manufacturer ID (0x1E) when A0 = VIL and Device Code (0x0B) when A0 = VIH - confirmed in datasheet Section 7.
What decoupling capacitance is required for stable operation of the AT27C040-90JI?
The AT27C040-90JI requires a 0.1 µF high-frequency ceramic capacitor placed between VCC and GND, mounted as close as possible to the device pins. For systems with multiple EPROMs, add a 4.7 µF bulk electrolytic capacitor near the array's power entry point - both specified in Switching Considerations section (page 2) of the datasheet.
AT27C040-90JI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tube
- 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-PLCC (13.97x11.43)
AT27C040-90JI FAQ
1.How can I place an order for AT27C040-90JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C040-90JI 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 AT27C040-90JI reliable?
The price and inventory of AT27C040-90JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C040-90JI is usually 5 days.
3.What payment methods are accepted for AT27C040-90JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C040-90JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C040-90JI?
AT27C040-90JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C040-90JI 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 AT27C040-90JI?
For technical support, including AT27C040-90JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C040-90JI requirements.
6.How does Aetrix verify that AT27C040-90JI is sourced from the original manufacturer or authorized distributors?
All AT27C040-90JI 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 AT27C040-90JI meets industry standards.
7.What is the process for return or replacement of AT27C040-90JI?
All AT27C040-90JI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C040-90JI, 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 AT27C040-90JI part is unused and in its original packaging.
Return procedure for AT27C040-90JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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