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Microchip Technology AT27C4096-55JU
- Part No.:
- AT27C4096-55JU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
AT27C4096-55JU.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:501
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Product details
Overview
AT27C4096-55JU from Atmel is a 4Mb (256K × 16) one-time programmable EPROM with 55ns read access time, 5V ±10% supply operation, and industrial temperature range (–40°C to +85°C). It features dual-line control (CE/OE), CMOS/TTL-compatible I/O, and integrated product identification code for automated programming. Used in firmware storage for 16-/32-bit microprocessor systems where non-volatile, low-latency code execution is required.
For engineers reviewing the AT27C4096-55JU datasheet, AT27C4096-55JU pinout, AT27C4096-55JU application, or AT27C4096-55JU equivalent, key selection criteria include read timing (tACC ≤ 55ns), standby current (≤100µA), VPP programming voltage (12.0V ±0.5V), and PLCC-44 package compatibility with JEDEC MS-018 AC.
Technical Context
The AT27C4096-55JU implements a x16 parallel memory architecture with address pins A0–A17 and bidirectional data outputs O0–O15. Its two-line enable scheme (CE active-low, OE active-low) eliminates bus contention in high-speed systems and supports fast output enable timing (tOE ≤ 20ns).
It uses rapid programming with 50µs/word CE pulses at elevated VCC (6.5V) and VPP (13.0V), verified per word with up to 10 retries. Product identification is accessed via A9 = VH (12.0V) and toggled A0, enabling automatic algorithm selection in industry-standard programmers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4,194,304 bits (256K × 16) - supports full firmware image storage for mid-complexity embedded controllers |
| Read access time | 55 ns max - eliminates WAIT states in 5 MHz microprocessor bus cycles |
| VCC supply | 5 V ±10% - compatible with standard TTL/CMOS logic rails without regulation overhead |
| Standby current | 100 µA max - enables low-power retention in battery-backed or intermittent-operation systems |
| Active current | 40 mA max at 5 MHz - defines thermal budget for dense EPROM arrays on PCBs |
| Programming voltage | VPP = 12.0 V ±0.5 V - requires dedicated high-voltage supply during programming only |
| Operating temperature | –40°C to +85°C - qualified for industrial-grade embedded equipment deployment |
Pinout & Package
AT27C4096-55JU is supplied in a 44-lead plastic J-leaded chip carrier (PLCC), JEDEC MS-018 AC compliant, with 16.51 mm × 16.51 mm body and 1.27 mm lead pitch. Both GND pins (pins 12 and 27) must be connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address inputs | 18-bit address bus supporting full 256K-word decoding; A0–A17 must be stable before CE/OE assertion |
| O0–O15 | Data outputs | 16-bit bidirectional data bus; high-impedance when CE or OE is high |
| CE | Chip enable | Active-low global device select; controls power state transition between active and standby |
| OE | Output enable | Active-low output gate; allows shared bus operation without tristate conflicts |
| VPP | Programming voltage | 12.0 V input required only during programming; must be applied simultaneously with or after VCC |
| VCC | Power supply | 5 V ±10% main supply; powers logic and output drivers during read mode |
| GND | Ground | Two dedicated ground pins (12, 27); both must be low-inductance connected to minimize noise coupling |
| NC | No connect | Pins 11, 23, 26, 39 - electrically isolated; no internal connection or function |
Key Features
| Feature | Design Value |
|---|---|
| Rapid programming algorithm | 50 µs/word typical - reduces total firmware burn time by >90% vs. legacy EPROMs |
| Integrated product ID code | Manufacturer ID (001Eh) and device code (00F4h) accessible via A9=VH - enables auto-detection in universal programmers |
| ESD and latchup immunity | 2,000 V HBM ESD protection and 200 mA latchup immunity - ensures robustness during handling and system integration |
| Two-line control interface | Separate CE and OE enables precise timing control and eliminates bus contention in multiprocessor or DMA environments |
| Green packaging option | Pb/halide-free PLCC-44 - meets RoHS Directive 2011/65/EU without requiring process requalification |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded Controller Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic and I/O mapping in programmable logic controllers deployed in factory automation cabinets. IC Role / Device Role / Timing Role: Non-volatile boot-time code repository accessed directly by 16-bit microcontroller bus at power-up. Use Value: 55ns access ensures deterministic startup within 100 µs; 100µA standby current minimizes heat buildup in sealed enclosures. | Use Scenario: Holding immutable BIOS and peripheral initialization routines in discontinued 32-bit industrial computers. IC Role / Device Role / Timing Role: Parallel x16 EPROM mapped into upper memory space, replacing obsolete 27C2048 devices. Use Value: Direct upgrade path from AT27C2048 with identical pinout and timing - no PCB redesign required. |
| Avionics Test Equipment Calibration Data | Medical Imaging System Configuration ROM |
Use Scenario: Storing calibrated sensor offset tables and test sequence parameters in portable avionics ground support units. IC Role / Device Role / Timing Role: Read-only configuration memory accessed via microcontroller during self-test initialization. Use Value: Industrial temperature rating (–40°C to +85°C) guarantees reliability across hangar-to-ramp environmental swings. | Use Scenario: Holding FPGA configuration bitstreams and safety-critical startup parameters in MRI subsystem controllers. IC Role / Device Role / Timing Role: Secure, tamper-resistant firmware store with no write capability post-programming. Use Value: One-time programmability prevents accidental or malicious firmware corruption during field service. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C4096-55PU | Same die, 40-lead PDIP package (0.600" width); tACC = 55ns, ICC = 40mA, ISB = 100µA | Through-hole mounting; higher thermal resistance than PLCC; requires larger board area | Select for legacy through-hole assembly lines or prototyping where socket compatibility is critical |
| AM27C4096-55DC | AMD second-source version; identical 44-lead PLCC pinout, same 55ns timing, but VPP tolerance ±0.7V vs. ±0.5V | Same industrial temp range; minor VPP margin difference affects high-volume programmer calibration | Choose when dual-sourcing is mandated; verify VPP regulator stability in existing programming fixtures |
Compared with AT27C4096-55PU and AM27C4096-55DC, the AT27C4096-55JU offers optimized surface-mount reliability in space-constrained industrial PCBs while maintaining full functional equivalence and JEDEC-compliant timing margins.
Availability
AT27C4096-55JU is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded controller boot ROM, and medical imaging system configuration ROM requiring stable component supply across extended production lifecycles.
Supply support for AT27C4096-55JU 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 wireless solutions, later acquired by Microchip Technology in 2016.
The AT27C series targets industrial and embedded systems requiring reliable, pin-compatible OTP EPROM upgrades with enhanced speed and programming efficiency over earlier generations.
FAQ
What is the maximum operating frequency supported by the AT27C4096-55JU?
The AT27C4096-55JU does not operate at a clock frequency - it is an asynchronous parallel EPROM. Its timing is defined by access delays: tACC ≤ 55ns, tCE ≤ 55ns, and tOE ≤ 20ns. When interfaced with a 5 MHz microprocessor bus (200 ns cycle time), the AT27C4096-55JU delivers full-width data without WAIT states. The 40 mA active current rating is specified at 5 MHz bus toggle rate, confirming its suitability for that speed class.
Can the AT27C4096-55JU be reprogrammed after initial programming?
No, the AT27C4096-55JU is a one-time programmable (OTP) EPROM. Once programmed, its contents cannot be erased or rewritten. The silicon fuse-based memory cells permanently retain data after the 12 V VPP programming pulse. This makes AT27C4096-55JU appropriate for secure, immutable firmware storage but unsuitable for development iterations requiring repeated updates.
What decoupling capacitors are required for stable operation of the AT27C4096-55JU?
The AT27C4096-55JU requires two decoupling capacitors: a 0.1 µF high-frequency ceramic capacitor placed as close as possible between VCC and GND pins (12 and 27), and a 4.7 µF bulk electrolytic capacitor near the power entry point for EPROM arrays. These prevent transient voltage excursions during CE transitions and stabilize VCC under dynamic load, ensuring compliance with the 5 V ±10% supply specification and avoiding nonconformance due to rail droop.
Is the AT27C4096-55JU pin-compatible with the AT27C2048 EPROM?
No, the AT27C4096-55JU is not pin-compatible with the AT27C2048. While both are x16 OTP EPROMs, the AT27C2048 uses a 40-pin PDIP or 42-pin PLCC, whereas the AT27C4096-55JU uses a 44-pin PLCC (44J) or 40-pin PDIP (40P6). Pin counts, pin functions (e.g., VPP location), and address/data widths differ. However, the AT27C4096-55JU is a direct functional upgrade - same interface protocol and timing model - requiring PCB layout revision for PLCC-44 implementation.
Does the AT27C4096-55JU support identification code reading, and how is it accessed?
Yes, the AT27C4096-55JU supports integrated product identification code reading. To access it: hold A1–A17 low, apply VH = 12.0 V ±0.5 V to A9, and toggle A0 - low (VIL) reads the manufacturer ID (001Eh), high (VIH) reads the device code (00F4h). This feature is used by industry-standard programmers to auto-select correct algorithms and voltages, eliminating manual part selection errors during mass production programming of AT27C4096-55JU devices.
AT27C4096-55JU 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:
- 55 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)
AT27C4096-55JU FAQ
1.How can I place an order for AT27C4096-55JU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C4096-55JU 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 AT27C4096-55JU reliable?
The price and inventory of AT27C4096-55JU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C4096-55JU is usually 5 days.
3.What payment methods are accepted for AT27C4096-55JU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C4096-55JU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C4096-55JU?
AT27C4096-55JU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C4096-55JU 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 AT27C4096-55JU?
For technical support, including AT27C4096-55JU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C4096-55JU requirements.
6.How does Aetrix verify that AT27C4096-55JU is sourced from the original manufacturer or authorized distributors?
All AT27C4096-55JU 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 AT27C4096-55JU meets industry standards.
7.What is the process for return or replacement of AT27C4096-55JU?
All AT27C4096-55JU units undergo pre-shipment inspection (PSI). If there is an issue with AT27C4096-55JU, 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 AT27C4096-55JU part is unused and in its original packaging.
Return procedure for AT27C4096-55JU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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