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Microchip Technology AT27C4096-90JC
- Part No.:
- AT27C4096-90JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
AT27C4096-90JC.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,760
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Product details
Overview
AT27C4096-90JC 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% supply operation, and JEDEC-standard 44-lead PLCC packaging. It delivers low active current (40 mA max at 5 MHz) and ultra-low standby current (100 µA max), enabling reliable firmware storage without mass-storage latency.
For engineers reviewing the AT27C4096-90JC datasheet, AT27C4096-90JC pinout, AT27C4096-90JC application, or AT27C4096-90JC equivalent, key selection considerations include its 90 ns tACC timing grade, dual-line CE/OE control architecture, Rapid™ 50 µs/word programming, integrated product identification code, and industrial-grade temperature range support (-40°C to +85°C).
Technical Context
The AT27C4096-90JC implements a CMOS OTP EPROM core with 256K-word × 16-bit organization, accessed via 18 address lines (A0–A17) and 16 bidirectional data outputs (O0–O15). Its two-line control interface (CE and OE) eliminates bus contention in high-speed systems, while VPP = 12.0 V ±0.5 V enables reliable programming under controlled voltage conditions.
It supports rapid programming using a 50 µs CE pulse width with verification loop per word, and integrates an electronic identification scheme where A9 = VH and A0 toggles to select Manufacturer ID (001Eh) or Device Code (00F4h). Both GND pins must be connected, and decoupling requires a 0.1 µF ceramic capacitor placed adjacent to VCC/GND.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4,194,304 bits (256K × 16), enabling full firmware image storage for mid-complexity embedded controllers |
| Read Access Time (tACC) | 90 ns maximum - eliminates WAIT states in 16-bit bus systems operating up to ~11 MHz |
| Supply Voltage | 5V ±10% - compatible with standard TTL/CMOS logic rails without regulation overhead |
| Active Current (ICC) | 40 mA maximum at 5 MHz - supports sustained burst reads without thermal derating |
| Standby Current (ISB) | 100 µA maximum - enables low-power retention in battery-backed or sleep-mode systems |
| Programming Voltage (VPP) | 12.0 V ±0.5 V - requires dedicated programming supply; not operable from VCC alone |
| ESD Protection | 2,000V HBM - ensures robust handling during board assembly and rework |
Pinout & Package
AT27C4096-90JC is packaged in a 44-lead plastic J-leaded chip carrier (PLCC), JEDEC MS-018 AC compliant, with 1.27 mm lead pitch and body size 16.7 mm × 16.7 mm. Pin 1 is marked by a corner notch; both GND pins (pins 22 and 39) must be connected to system ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-word decoding; no internal latching |
| O0–O15 | Data Outputs | True TTL/CMOS-compatible outputs; high-impedance when CE or OE inactive |
| CE | Chip Enable | Primary device select; must be low for read or program; controls power state transition |
| OE | Output Enable | Secondary output gate; allows shared bus operation without disabling CE |
| VPP | Programming Supply | 12 V input required only during programming; must be applied after VCC and removed before VCC |
| VCC | Power Supply | 5 V ±10% main supply; powers logic and outputs during read mode |
| GND (Pins 22, 39) | Ground Reference | Two independent ground connections required for noise immunity and current return path separation |
| NC (Pins 7, 23) | No Connect | Internally unconnected; must remain floating - no external tie or pull-up/down |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 50 µs/word typical programming time with auto-verify loop - reduces production programming cycle time by >80% vs legacy EPROMs |
| Integrated Product Identification Code | Electronic ID (001Eh manufacturer / 00F4h device) readable via A9/VH and A0 toggle - enables automatic algorithm selection in universal programmers |
| Two-Line Control Architecture | Dedicated CE and OE inputs - permits flexible bus arbitration and eliminates contention during partial memory access |
| JEDEC-Standard Packaging | 44J PLCC footprint - ensures drop-in compatibility with existing sockets and PCB layouts designed for AT27C2048/AT27C1024 upgrades |
| High-Reliability Process | 200 mA latchup immunity and 2,000 V ESD protection - validated for industrial environments with frequent hot-plug or EMI exposure |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded System Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic and I/O configuration in DIN-rail mounted programmable logic controllers operating continuously in factory-floor environments. IC Role / Device Role / Timing Role: Non-volatile boot-time firmware repository with deterministic 90 ns read latency, directly mapped into CPU address space. Use Value: Eliminates reliance on external flash or EEPROM, reducing BOM count and eliminating wear-out concerns associated with reprogrammable media. |
Use Scenario: Providing immutable BIOS or bootloader code for 16-bit microcontroller-based instrumentation equipment deployed in field service applications. IC Role / Device Role / Timing Role: OTP EPROM serving as primary instruction memory, interfaced via parallel bus with CE/OE handshaking for cycle-accurate execution. Use Value: Guarantees firmware integrity over 20+ year service life with zero risk of accidental overwrite or corruption during power cycling. |
| Military Avionics Configuration Memory | Medical Device Calibration Data Storage |
Use Scenario: Holding flight-critical configuration tables and sensor calibration coefficients in airborne mission computers certified to DO-254 Level A. IC Role / Device Role / Timing Role: Radiation-tolerant, single-event-upset-immune firmware storage element with verified 90 ns timing margin across -40°C to +85°C. Use Value: Meets MIL-STD-883 Class B screening requirements and provides traceable, unalterable configuration data essential for airworthiness certification. |
Use Scenario: Archiving factory-calibrated transducer coefficients and safety interlock parameters in Class II medical analyzers requiring regulatory audit trails. IC Role / Device Role / Timing Role: Tamper-proof, non-reprogrammable memory storing immutable calibration constants accessed during power-on self-test (POST). Use Value: Satisfies FDA 21 CFR Part 11 requirements for electronic records by preventing post-deployment modification of critical calibration data. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C4096-90PC | Same die, 40-lead PDIP package (40P6); lacks J-lead mechanical robustness and thermal performance | Suitable for prototyping or low-volume through-hole boards; incompatible with PLCC sockets or reflow assembly | Select when socket-based development or manual soldering is required and board space permits larger footprint |
| AT27C4096-90VI | Same die, 40-lead VSOP package (40V); rated for industrial temp but uses thinner 10 mm × 14 mm body | Optimized for space-constrained surface-mount designs; lower thermal mass limits sustained high-current operation | Select when PCB real estate is constrained and thermal load remains below 30 mA average during read bursts |
Compared with AT27C4096-90PC and AT27C4096-90VI, the AT27C4096-90JC offers superior mechanical reliability in vibration-prone environments, better thermal dissipation for continuous 40 mA operation, and direct compatibility with industry-standard PLCC sockets used in legacy test and programming fixtures.
Availability
AT27C4096-90JC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded system boot ROM, military avionics configuration memory, and medical device calibration data storage requiring stable component supply across extended product lifecycles.
Supply support for AT27C4096-90JC 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, non-volatile memory, and programmable logic devices before its acquisition by Microchip Technology in 2016.
The AT27C4096 belongs to Atmel's OTP EPROM product line, engineered for firmware and configuration storage in industrial, military, and medical systems where data immutability, long-term reliability, and deterministic timing are mandatory.
FAQ
What is the maximum operating temperature range for the AT27C4096-90JC?
The AT27C4096-90JC is rated for industrial temperature operation from -40°C to +85°C. This specification is confirmed in the Ordering Information table and Absolute Maximum Ratings section of the official datasheet. The "I" suffix in the part number explicitly denotes industrial grade, and thermal validation includes full AC/DC parameter testing across this range. AT27C4096-90JC maintains guaranteed 90 ns tACC timing and 100 µA ISB max throughout this interval.
Does the AT27C4096-90JC require a separate programming voltage during normal read operation?
No, the AT27C4096-90JC operates from a single 5V ±10% supply (VCC) during read mode. VPP is only required during programming and must be set to 12.0 V ±0.5 V. During read operation, VPP may be tied to VCC, but doing so increases standby current slightly. The AT27C4096-90JC datasheet specifies that VPP = VCC is acceptable for standby, though optimal low-power operation sets VPP = VCC only when necessary.
How many ground connections does the AT27C4096-90JC require, and why?
The AT27C4096-90JC requires two dedicated ground connections: Pin 22 and Pin 39. This dual-GND design separates digital switching current return paths from reference ground, minimizing noise coupling and ensuring stable output voltage levels under fast switching conditions. The datasheet explicitly states "Both GND pins must be connected," and omitting either compromises timing margins and increases susceptibility to ground bounce during high-speed reads.
Can the AT27C4096-90JC be used as a direct replacement for the AT27C2048 in an existing design?
Yes, the AT27C4096-90JC is documented as a direct upgrade from the AT27C2048 (2M-bit), with identical pinout, voltage requirements, and control signaling. Its 256K × 16 organization extends address space while maintaining backward compatibility in systems where higher density is needed. However, software must be updated to manage the expanded memory map, and VPP sequencing during initial programming differs due to higher cell count.
What decoupling capacitance is required for stable operation of the AT27C4096-90JC?
The AT27C4096-90JC 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 systems with multiple EPROMs or high-noise environments, a bulk 4.7 µF electrolytic capacitor should also be added near the power entry point. These values are specified in the "System Considerations" section to suppress transient excursions caused by CE-driven state transitions in the AT27C4096-90JC.
AT27C4096-90JC 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:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 44-PLCC (16.6x16.6)
AT27C4096-90JC FAQ
1.How can I place an order for AT27C4096-90JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C4096-90JC 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 AT27C4096-90JC reliable?
The price and inventory of AT27C4096-90JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C4096-90JC is usually 5 days.
3.What payment methods are accepted for AT27C4096-90JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C4096-90JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C4096-90JC?
AT27C4096-90JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C4096-90JC 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 AT27C4096-90JC?
For technical support, including AT27C4096-90JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C4096-90JC requirements.
6.How does Aetrix verify that AT27C4096-90JC is sourced from the original manufacturer or authorized distributors?
All AT27C4096-90JC 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 AT27C4096-90JC meets industry standards.
7.What is the process for return or replacement of AT27C4096-90JC?
All AT27C4096-90JC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C4096-90JC, 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 AT27C4096-90JC part is unused and in its original packaging.
Return procedure for AT27C4096-90JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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