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Microchip Technology AT27C4096-90JI
- Part No.:
- AT27C4096-90JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
AT27C4096-90JI.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 44PLCC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT27C4096-90JI from Atmel is a 4-Mbit (256K × 16) one-time programmable EPROM optimized for high-performance 16-/32-bit microprocessor systems, featuring 90 ns read access time, 5V ±10% single-supply operation, and industrial temperature range (−40°C to +85°C). It supports two-line control (CE/OE), delivers 40 mA active current at 5 MHz, and uses CMOS/TTL-compatible I/Os for seamless integration into legacy embedded firmware storage.
For engineers reviewing the AT27C4096-90JI datasheet, AT27C4096-90JI pinout, AT27C4096-90JI application, or AT27C4096-90JI equivalent, key selection criteria include OTP reliability for firmware boot code, JEDEC-standard 40-pin PDIP/PLCC/VSOP package compatibility, rapid 50 µs/word programming, and dual VPP/VCC voltage sequencing requirements during programming.
Technical Context
The AT27C4096-90JI implements a by-16 organization with 18 address lines (A0–A17) and 16 bidirectional data outputs (O0–O15), enabling direct interface with 16-bit data buses without external multiplexing. Its two-line enable architecture (CE and OE) eliminates bus contention in high-speed systems by supporting independent chip and output gating.
Programming relies on a dedicated 12.0 V ±0.5 V VPP supply applied only during Rapid™ algorithm execution, while read mode operates solely from 5V. The device integrates an electronic product identification code accessible via A9/A0 toggling, allowing automated programmer recognition of manufacturer (001Eh) and device type (00F4h).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4,194,304 bits (256K × 16) - supports full firmware images for 16-bit MCUs without bank switching |
| Read Access Time | 90 ns max - eliminates WAIT states in 10 MHz CPU systems with ≤90 ns memory cycle requirement |
| Supply Voltage | 5V ±10% - compatible with standard TTL/CMOS logic rails; no auxiliary voltage regulators needed |
| Active Current | 40 mA max at 5 MHz - enables thermal design for dense EPROM arrays in industrial controllers |
| Standby Current | 100 µA max - suitable for low-power modes in battery-backed or energy-sensitive systems |
| Programming Voltage | VPP = 12.0 V ±0.5 V - requires isolated high-voltage supply; not compatible with standard 5V-only programmers |
| ESD Protection | 2,000 V HBM - meets industrial handling requirements without additional protection circuitry |
Pinout & Package
AT27C4096-90JI is supplied in a 40-lead plastic dual inline package (PDIP), 0.600" wide (JEDEC MS-011 AC), with pins 1–20 and 21–40 arranged in two parallel rows. Both GND pins (pin 20 and pin 40) must be connected for stable operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus interface; selects one of 256K words; A0–A17 fully decoded internally |
| O0–O15 | Data Outputs | 16-bit bidirectional data bus; high-impedance when CE or OE inactive; TTL/CMOS compatible |
| CE | Chip Enable | Active-low global enable; controls power state transition between standby (VIH) and active (VIL) |
| OE | Output Enable | Active-low output gate; allows data bus sharing without contention when CE remains asserted |
| VPP | Programming Voltage | 12 V input required only during programming; must be applied after and removed before VCC per sequencing rules |
| VCC | Power Supply | 5 V ±10% main supply; powers logic and outputs during read; supplies ICC current up to 40 mA |
| GND | Ground | Two dedicated ground pins (20 & 40); mandatory connection to minimize noise and ensure latchup immunity |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 50 µs/word typical programming time - reduces firmware update cycles by >90% vs. legacy EPROMs |
| Integrated Product ID Code | Manufacturer ID (001Eh) and Device Code (00F4h) readable via A9/A0 - enables auto-detection in universal programmers |
| Two-Line Control Architecture | Independent CE and OE inputs - permits partial bus driving and eliminates need for external bus transceivers |
| JEDEC-Standard Packages | 40P6 PDIP, 44J PLCC, 40V VSOP footprints - ensures drop-in replacement across legacy board designs |
| High-Reliability CMOS Process | 200 mA latchup immunity and 2 kV ESD rating - sustains operation in electrically noisy industrial environments |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic and I/O mapping tables in programmable logic controllers operating in factory-floor environments with wide temperature swings and EMI. IC Role / Device Role / Timing Role: Nonvolatile boot-time firmware repository accessed sequentially during cold start; provides deterministic 90 ns read latency for real-time task initialization. Use Value: Eliminates reliance on slower serial EEPROM or flash, ensuring sub-100 ns instruction fetch timing critical for deterministic scan-cycle execution. |
Use Scenario: Holding BIOS or bootloader code in 1990s-era industrial computers and test equipment where field-upgradability is unnecessary but long-term data retention is essential. IC Role / Device Role / Timing Role: Static memory-mapped ROM mapped to upper address space (e.g., 0xFF0000–0xFFFFFF); addressed directly by x86 or 68K CPU without wait-state insertion. Use Value: Guarantees bit-perfect firmware integrity over 20+ years with zero refresh overhead-critical for unattended operation in remote monitoring systems. |
| Military Avionics Configuration Memory | Medical Device Calibration Data |
Use Scenario: Storing flight-critical configuration parameters (e.g., sensor scaling factors, actuator limits) in airborne control units certified to DO-254 Level A. IC Role / Device Role / Timing Role: OTP-configured memory accessed during pre-flight self-test; immune to radiation-induced bit flips due to CMOS process hardening. Use Value: Provides tamper-proof, write-once storage that cannot be altered in-service-meeting traceability and audit requirements for safety-critical systems. |
Use Scenario: Retaining factory-calibrated ADC offset/gain coefficients and transducer linearization tables in Class II medical instruments (e.g., infusion pumps, ECG monitors). IC Role / Device Role / Timing Role: Read-only calibration database accessed at power-on; organized as 16-bit words aligned to sensor channel pairs for efficient DMA loading. Use Value: Ensures regulatory compliance (FDA 21 CFR Part 11) by preventing accidental or malicious modification of calibration constants post-manufacture. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C4096-90DC | Same 4-Mbit ×16 OTP EPROM, but manufactured by AMD; identical 90 ns access, 5V supply, and PDIP/PLCC/VSOP packages | No functional difference; pinout and timing match AT27C4096-90JI exactly; same Rapid™ programming algorithm | Valid second-source option with identical footprint and electrical behavior-no redesign needed |
| MX27C4096-90PC | Macronix variant; 90 ns access, 5V ±10%, but specifies 150 mA latchup immunity (vs. 200 mA) and 1.5 kV ESD rating (vs. 2 kV) | Suitable for commercial-grade applications; lower robustness margin may require additional board-level protection in harsh industrial settings | Cost-optimized alternative where extended latchup/ESD margins are non-critical; verify system-level EMC compliance |
Compared with AM27C4096-90DC, AT27C4096-90JI offers identical functionality and drop-in compatibility, while MX27C4096-90PC trades minor reliability margins for price advantage-making it viable only in controlled environments where Atmel's 200 mA latchup immunity isn't mandated.
Availability
AT27C4096-90JI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded boot ROM, military avionics configuration memory, and medical device calibration data applications requiring stable component supply across extended product lifecycles.
Supply support for AT27C4096-90JI 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 programmable logic devices, acquired by Microchip Technology in 2016.
The AT27C4096 belongs to Atmel's OTP EPROM product line designed specifically for high-reliability, long-lifecycle firmware storage in industrial, automotive, and aerospace systems where field reprogrammability is unnecessary but data integrity is mission-critical.
FAQ
What is the maximum operating temperature range for the AT27C4096-90JI?
The AT27C4096-90JI is rated for industrial temperature operation from −40°C to +85°C. This specification is confirmed in the Ordering Information table on page 9 of the datasheet, where the "JI" suffix explicitly denotes the industrial grade. The device maintains full 90 ns access time and all DC/AC parameters within this range, making it suitable for deployment in uncontrolled environmental conditions such as factory automation cabinets or outdoor telecom enclosures.
Does the AT27C4096-90JI require a separate programming voltage during normal read operation?
No, the AT27C4096-90JI operates from a single 5V ±10% supply during read mode; VPP is only required during programming. As stated in the Description section (page 1), "It requires a single 5V power supply in normal read mode operation." VPP must be disconnected or held at VCC level (≤5.5V) during read to prevent unintended programming or increased standby current, per the note on page 5 stating "VCC > VPP will cause a slight increase in ISB."
How many address lines does the AT27C4096-90JI have, and what memory size do they support?
The AT27C4096-90JI has 18 address lines (A0 through A17), supporting its full 256K-word (4,194,304-bit) capacity organized as 256K × 16. This is explicitly defined in the Pin Name table (page 1) and confirmed in the Description: "organized 256K by 16 bits." Each unique A0–A17 combination selects one 16-bit word, enabling direct addressing without external decoding logic in 16-bit bus architectures.
Can the AT27C4096-90JI be used as a direct replacement for the AT27C2048 in existing designs?
Yes-the AT27C4096-90JI is explicitly designated as a "direct upgrade" from the AT27C2048 (2M-bit EPROM), per the Features list on page 1. Both share identical pinouts in PDIP/PLCC/VSOP packages, 5V supply, and CE/OE control scheme. However, the AT27C4096-90JI doubles the address space (A18 not present; A0–A17 reused), so software must map to the expanded 256K-word range, and hardware must ensure A18 is not driven or is tied appropriately per system address decoding.
What decoupling capacitance is required for stable operation of the AT27C4096-90JI?
Per the System Considerations section (page 2), each AT27C4096-90JI requires a 0.1 µF high-frequency ceramic capacitor placed between VCC and GND, mounted as close to the device as possible. For boards with multiple EPROMs, a 4.7 µF bulk electrolytic capacitor must also be added near the power entry point. These values are mandatory to suppress transient voltage excursions during CE transitions and ensure compliance with absolute maximum ratings, especially under industrial temperature cycling.
AT27C4096-90JI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 44-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:
- 256K x 16
- 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:
- 44-PLCC (16.6x16.6)
AT27C4096-90JI FAQ
1.How can I place an order for AT27C4096-90JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C4096-90JI 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 AT27C4096-90JI reliable?
The price and inventory of AT27C4096-90JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C4096-90JI is usually 5 days.
3.What payment methods are accepted for AT27C4096-90JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C4096-90JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C4096-90JI?
AT27C4096-90JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C4096-90JI 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 AT27C4096-90JI?
For technical support, including AT27C4096-90JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C4096-90JI requirements.
6.How does Aetrix verify that AT27C4096-90JI is sourced from the original manufacturer or authorized distributors?
All AT27C4096-90JI 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 AT27C4096-90JI meets industry standards.
7.What is the process for return or replacement of AT27C4096-90JI?
All AT27C4096-90JI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C4096-90JI, 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 AT27C4096-90JI part is unused and in its original packaging.
Return procedure for AT27C4096-90JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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