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Microchip Technology AT27C4096-90JU
- Part No.:
- AT27C4096-90JU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
AT27C4096-90JU.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,696
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Product details
Overview
AT27C4096-90JU from Microchip Technology (formerly Atmel) is a 4-Mbit one-time programmable EPROM organized as 256K × 16, operating at 5V ±10%, with 90ns read access time, 100µA max standby current, and JEDEC-standard 44-lead PLCC packaging. It serves as firmware storage in industrial 16/32-bit microprocessor systems requiring nonvolatile, latchup-immune memory without WAIT states.
For engineers reviewing the AT27C4096-90JU datasheet, AT27C4096-90JU pinout, AT27C4096-90JU application, or AT27C4096-90JU equivalent, key selection criteria include its OTP architecture, dual-line control (CE/OE), rapid 50µs/word programming, integrated product identification code, and industrial temperature range (–40°C to +85°C).
Technical Context
The AT27C4096-90JU implements a CMOS-based OTP EPROM architecture with two-line enable control (CE and OE) to prevent bus contention in high-speed systems. Its x16 data bus and 256K-word address space support direct interfacing with 16- and 32-bit microprocessors without external data-width conversion.
It features dedicated VPP (12.0V ±0.5V) for programming, integrated product ID code accessible via A9/VH and A0 toggling, and robust ESD protection (2,000V) with 200mA latchup immunity - all validated for industrial ambient operation and green (Pb/halide-free) packaging compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4,194,304-bit (256K × 16) - supports full firmware images for mid-complexity embedded controllers |
| Read access time | 90ns max - eliminates WAIT states in 5MHz microprocessor buses |
| Supply voltage | 5V ±10% - compatible with standard TTL/CMOS logic rails and legacy industrial power supplies |
| Standby current | 100µA max - enables low-power retention in always-on industrial control modules |
| Active current | 40mA max at 5MHz - ensures stable operation under sustained read bursts without thermal derating |
| Programming speed | 50µs/word typical - reduces firmware update cycle time during manufacturing programming |
| Operating temperature | –40°C to +85°C - qualified for deployment in uncontrolled industrial enclosures and factory-floor environments |
Pinout & Package
AT27C4096-90JU is packaged in a 44-lead plastic J-leaded chip carrier (PLCC), JEDEC MS-018 AC compliant, with 17 address inputs (A0–A17), 16 bidirectional data outputs (O0–O15), dual enable pins (CE, OE), VCC, VPP, GND (2×), and 3 no-connect (NC) terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address inputs | 256K-word addressing (A0–A17 = 18 bits); A9 used with VH for product ID access |
| O0–O15 | Data outputs | 16-bit parallel data bus; CMOS/TTL-compatible drive strength (VOH ≥2.4V, VOL ≤0.4V) |
| CE | Chip enable | Active-low global device select; controls entry into rapid programming mode when pulsed at VPP |
| OE | Output enable | Active-low output gate; allows shared bus operation with other peripherals without contention |
| VPP | Programming voltage | 12.0V ±0.5V input required only during programming; must be applied simultaneously with VCC |
| GND (2×) | Ground reference | Both pins must be connected to minimize noise coupling and ensure reliable read/write margins |
| NC (3×) | No connect | Unbonded internal terminals; must remain floating per JEDEC PLCC layout rules |
Key Features
| Feature | Design Value |
|---|---|
| Rapid programming algorithm | 50µs/word typical pulse width enables <1-second full-device programming for 256K words |
| Integrated product ID code | Two-word electronic signature (001Eh manufacturer, 00F4h device type) auto-detected by programmers to select correct algorithms |
| Dual-line control (CE/OE) | Eliminates bus contention in multi-peripheral systems by decoupling chip selection from output gating |
| High-reliability CMOS process | 2,000V HBM ESD rating and 200mA latchup immunity ensure field robustness in noisy industrial environments |
| Green Pb/halide-free packaging | 44J PLCC meets RoHS Directive 2011/65/EU and JEDEC J-STD-609A Class 1 moisture sensitivity |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded Controller Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic and I/O mapping tables in programmable logic controllers deployed in factory automation lines. IC Role / Device Role / Timing Role: Nonvolatile boot-time firmware repository accessed at system power-up and during runtime configuration reads. Use Value: 90ns access time ensures deterministic scan-cycle timing; OTP architecture prevents accidental overwrites during field maintenance. | Use Scenario: Providing immutable startup code and hardware initialization routines for 16-bit microcontrollers in medical diagnostic equipment. IC Role / Device Role / Timing Role: Primary read-only memory mapped at reset vector address; x16 interface matches native bus width of target MCU. Use Value: 256K × 16 organization eliminates need for external data-width expansion logic, reducing BOM count and PCB area. |
| Military Communications Module BIOS | Automated Test Equipment (ATE) Pattern Memory |
Use Scenario: Holding secure bootloader and cryptographic key validation firmware in ruggedized radio transceivers operating across –40°C to +85°C. IC Role / Device Role / Timing Role: Tamper-resistant, one-time-programmable storage for critical security-critical firmware blocks. Use Value: Industrial temp grade and 200mA latchup immunity withstand voltage transients common in vehicle-mounted RF platforms. | Use Scenario: Storing digital stimulus/response patterns for semiconductor wafer-level functional testing in automated probe stations. IC Role / Device Role / Timing Role: High-speed pattern buffer accessed synchronously with test clock; CE/OE timing optimized for burst-mode reads. Use Value: 40mA active current at 5MHz supports sustained 100+ ns read cycles without supply droop-induced timing violations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C4096-55JU | 55ns read access time; identical pinout, voltage, and OTP functionality | Suitable where sub-90ns timing margin is required for >5MHz bus interfaces | Select when system timing budget demands tighter tACC/tCE specifications |
| AM27C4096-90DC | Same 4Mb x16 OTP EPROM spec; manufactured by AMD (now part of Advanced Micro Devices), 44-pin PLCC, 90ns access | Validated in legacy AMD-based industrial designs; same JEDEC footprint but different ID code structure | Choose for second-source continuity in long-lifecycle AMD-platform systems |
Compared with AT27C4096-55JU, the AT27C4096-90JU trades 35ns slower access for broader timing margin and lower cost; versus AM27C4096-90DC, it offers identical performance but distinct product ID encoding and programming voltage tolerance (±0.5V vs ±0.7V), requiring tooling-specific algorithm selection.
Availability
AT27C4096-90JU is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded controller boot ROM, military communications module BIOS, and automated test equipment (ATE) pattern memory requiring stable component supply across extended production lifecycles.
Supply support for AT27C4096-90JU 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
Microchip Technology acquired Atmel in 2016 and maintains full technical and supply chain responsibility for the AT27C4096 family. The company specializes in microcontrollers, analog, and memory solutions for industrial, automotive, and aerospace markets.
The AT27C4096 series was designed as a drop-in OTP EPROM upgrade path for legacy 512K/1M/2M-bit EPROMs (AT27C516/AT27C1024/AT27C2048), targeting firmware storage in resource-constrained, high-reliability embedded systems where flash endurance or reprogrammability is unnecessary.
FAQ
What is the maximum operating temperature range for the AT27C4096-90JU?
The AT27C4096-90JU is rated for industrial temperature operation from –40°C to +85°C. This range is validated per JEDEC JESD22-A104 and confirmed in the datasheet's "DC and AC operating conditions" table. Operation outside this range may result in parametric failure or reduced reliability. The AT27C4096-90JU uses high-reliability CMOS technology with 200mA latchup immunity to sustain performance across this full span without derating.
Does the AT27C4096-90JU require a separate programming voltage, and what is its value?
Yes, the AT27C4096-90JU requires VPP = 12.0V ±0.5V applied to pin 39 during programming. This voltage must be applied simultaneously with or after VCC and removed simultaneously with or before VCC. The AT27C4096-90JU uses this elevated voltage to inject charge into the floating gate during the 50µs CE pulse programming cycle. Failure to meet VPP timing or tolerance risks incomplete programming or device damage.
Can the AT27C4096-90JU be used in a 5V-only system without VPP connections?
Yes - the AT27C4096-90JU operates in read mode using only 5V ±10% on VCC (pin 40); VPP (pin 39) is left unconnected or tied to VCC during normal read operation. The AT27C4096-90JU's dual-voltage design isolates programming functionality entirely from read functionality, enabling seamless integration into existing 5V logic systems without redesign. VPP is only energized during factory programming or field rework.
How does the integrated product identification code work on the AT27C4096-90JU?
The AT27C4096-90JU contains a two-word electronic ID: manufacturer code 001Eh and device code 00F4h. To read it, hold A1–A17 low, apply VH (11.5–12.5V) to A9, and toggle A0 between VIL and VIH while keeping CE and OE low. The AT27C4096-90JU outputs the codes on O0–O15, allowing automatic detection by industry-standard programmers to select correct algorithms and verify authenticity.
Is the AT27C4096-90JU pin-compatible with earlier Atmel EPROMs like the AT27C2048?
No - the AT27C4096-90JU is not pin-compatible with AT27C2048 (2Mb). While both use 44-lead PLCC packages, the AT27C4096-90JU has 18 address lines (A0–A17) and 16 data lines (O0–O15), whereas AT27C2048 has 17 address lines (A0–A16) and 8 data lines (O0–O7). The AT27C4096-90JU is a direct upgrade in density and organization, not pinout; board redesign is required to migrate from AT27C2048 to AT27C4096-90JU.
AT27C4096-90JU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 44-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- 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)
AT27C4096-90JU FAQ
1.How can I place an order for AT27C4096-90JU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C4096-90JU 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 AT27C4096-90JU reliable?
The price and inventory of AT27C4096-90JU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C4096-90JU is usually 5 days.
3.What payment methods are accepted for AT27C4096-90JU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C4096-90JU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C4096-90JU?
AT27C4096-90JU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C4096-90JU 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 AT27C4096-90JU?
For technical support, including AT27C4096-90JU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C4096-90JU requirements.
6.How does Aetrix verify that AT27C4096-90JU is sourced from the original manufacturer or authorized distributors?
All AT27C4096-90JU 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 AT27C4096-90JU meets industry standards.
7.What is the process for return or replacement of AT27C4096-90JU?
All AT27C4096-90JU units undergo pre-shipment inspection (PSI). If there is an issue with AT27C4096-90JU, 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 AT27C4096-90JU part is unused and in its original packaging.
Return procedure for AT27C4096-90JU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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