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Microchip Technology AT27C4096-55JC
- Part No.:
- AT27C4096-55JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
AT27C4096-55JC.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,865
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Product details
Overview
AT27C4096-55JC from Atmel is a 4-Mbit (256K × 16) one-time programmable EPROM optimized for high-speed read access in 16-/32-bit microprocessor systems, featuring 55 ns access time, 5V ±10% supply, 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 AT27C4096-55JC datasheet, AT27C4096-55JC pinout, AT27C4096-55JC application, or AT27C4096-55JC equivalent, key selection criteria include its OTP architecture, dual-line control (CE/OE), Rapid™ programming (50 µs/word), integrated product identification code, and industrial temperature support (-40°C to +85°C).
Technical Context
The AT27C4096-55JC implements a CMOS-based OTP EPROM architecture with 18 address lines (A0–A17) supporting 256K-word addressing and 16-bit parallel outputs (O0–O15). Its two-line enable scheme (CE and OE) eliminates bus contention in high-speed systems, while VPP = 12.0 V ±0.5 V enables programming via the Rapid™ algorithm.
It features electrically identifiable manufacturer and device codes accessed via A9 = 12 V and A0 toggling, and supports both commercial (0°C to 70°C) and industrial (-40°C to 85°C) operating ranges. Absolute maximum ratings include -2.0 V to +7.0 V on I/O pins and -2.0 V to +14.0 V on A9/VPP, with 2,000 V ESD protection and 200 mA latchup immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4,194,304 bits (256K × 16) - supports full 16-bit data bus interface without byte-wide splitting |
| Read Access Time | 55 ns - eliminates WAIT states in 5 MHz microprocessor systems |
| Supply Voltage | 5 V ±10% - compatible with standard TTL/CMOS logic rails and legacy 5V system designs |
| Standby Current | 100 µA maximum - enables low-power hold mode during processor idle cycles |
| Active Current | 40 mA maximum at 5 MHz - ensures stable operation under sustained read load without thermal derating |
| Programming Voltage | VPP = 12.0 V ±0.5 V - requires dedicated programming supply; not operational during read mode |
| Operating Temperature | -40°C to +85°C - qualified for industrial embedded control and automotive under-hood auxiliary modules |
Pinout & Package
AT27C4096-55JC is supplied in a 44-lead plastic J-leaded chip carrier (PLCC), JEDEC MS-018 AC compliant, with 16 mm × 16 mm body size and 1.27 mm lead pitch. Both GND pins must be connected for proper noise immunity and power integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus interface; fully decoded to select one of 256K words |
| O0–O15 | Data Outputs | 16-bit bidirectional output bus; high-impedance when CE or OE inactive |
| CE | Chip Enable | Primary device select; must be low for read or program operations |
| OE | Output Enable | Secondary output gate; controls data bus drive timing independently of CE |
| VPP | Programming Supply | 12 V input required only during programming; tied to VCC in read mode |
| VCC | Power Supply | 5 V ±10% main supply; must be applied before/removed after VPP during programming |
| GND (Pins 22 & 30) | Ground Reference | Dual ground connections reduce ground bounce and improve signal integrity |
| NC (Pins 7, 23, 44) | No Connect | Internally unconnected; must remain floating per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 50 µs/word typical programming time - reduces firmware update cycle time by >90% vs. legacy EPROMs |
| Integrated Product Identification Code | Manufacturer ID (001Eh) and Device Code (00F4h) accessible via A9=12 V and A0 toggle - enables automatic algorithm selection in production programmers |
| Two-Line Control Architecture | Independent CE and OE inputs - allows precise output timing control and prevents bus contention in multiplexed memory systems |
| High-Reliability CMOS Process | 2,000 V HBM ESD rating and 200 mA latchup immunity - suitable for manufacturing environments and field-deployed industrial equipment |
| JEDEC-Standard Packaging | 44J PLCC footprint - ensures drop-in compatibility with existing sockets and PCB layouts designed for industry-standard EPROMs |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded System Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic and I/O mapping firmware in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Non-volatile boot-time instruction store accessed directly by 16-bit microcontroller during power-on reset sequence. Use Value: 55 ns access time ensures deterministic boot within 10 ms; OTP nature prevents accidental corruption during field updates. |
Use Scenario: Providing immutable BIOS or bootloader code for legacy 16-bit embedded controllers in medical diagnostic instruments. IC Role / Device Role / Timing Role: Read-only memory mapped at fixed address range; enabled via CE/OE handshake synchronized to CPU clock. Use Value: 256K × 16 organization matches native bus width, eliminating glue logic; industrial temp rating supports operation inside sealed enclosures. |
| Military Communications Equipment | Automotive Engine Control Module (ECM) |
Use Scenario: Holding encrypted configuration tables and protocol stacks in secure HF/VHF radio transceivers requiring tamper-resistant firmware. IC Role / Device Role / Timing Role: Secure OTP storage for mission-critical parameters; programmed once during final test and sealed. Use Value: Integrated ID code enables automated verification during depot-level reprogramming; 2,000 V ESD withstand protects against handling damage. |
Use Scenario: Storing calibrated fuel injection maps and ignition timing curves in engine control units operating under under-hood thermal stress. IC Role / Device Role / Timing Role: Static lookup table accessed during real-time combustion cycle calculations. Use Value: -40°C to +85°C rating meets AEC-Q100 Grade 2 requirements; low standby current minimizes parasitic drain on vehicle battery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C4096-55PC | Same die, 40-lead PDIP package (40P6); no PLCC leads or J-bend geometry | Suitable for through-hole prototyping or legacy socketed designs; lacks surface-mount compatibility | Select when board layout uses 0.600" DIP sockets or manual assembly is preferred |
| AT27C4096-55VI | Same die, 40-lead VSOP package (40V); 10 mm × 14 mm footprint, thinner profile | Optimized for space-constrained industrial modules; lower thermal mass than PLCC | Select when PCB area is limited and reflow soldering is available |
Compared with AT27C4096-55PC and AT27C4096-55VI, the AT27C4096-55JC offers superior mechanical robustness in vibration-prone environments due to PLCC's gull-wing lead form and higher mounting reliability, while maintaining identical timing, programming, and electrical behavior.
Availability
AT27C4096-55JC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded system boot ROM, military communications equipment, and automotive engine control module applications requiring stable component supply across extended lifecycle windows.
Supply support for AT27C4096-55JC 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, acquired by Microchip Technology in 2016.
The AT27C4096 belongs to Atmel's OTP EPROM product line, engineered for high-reliability, low-power firmware storage in industrial, automotive, and defense systems where data immutability and long-term retention are critical.
FAQ
What is the programming voltage requirement for AT27C4096-55JC?
The AT27C4096-55JC requires VPP = 12.0 V ±0.5 V during programming operations, applied only to pin 39. This voltage must be sequenced such that VCC is applied before VPP and removed after VPP. During normal read operation, VPP is tied to VCC. The AT27C4096-55JC does not support in-system programming and requires a dedicated EPROM programmer with precise VPP regulation.
Does AT27C4096-55JC support both commercial and industrial temperature ranges?
Yes, the AT27C4096-55JC is rated for industrial temperature operation from -40°C to +85°C, as confirmed by its ordering code suffix "I" and the "JI" designation in Atmel's ordering information table. It is not rated for commercial-only use; the "C" suffix variants (e.g., AT27C4096-55JC) denote industrial-grade qualification, unlike "JC" codes which explicitly indicate industrial range.
How many address and data lines does AT27C4096-55JC have?
The AT27C4096-55JC has 18 address lines (A0–A17) to access its 256K-word capacity and 16 bidirectional data output lines (O0–O15), matching its 256K × 16 organization. There are no dedicated input lines - all data paths are output-only in read mode, and programming occurs via address/data latching under CE/VPP control.
Can AT27C4096-55JC be used as a direct replacement for AT27C2048?
Yes, the AT27C4096-55JC is explicitly documented as a direct upgrade path from AT27C2048 (2M-bit EPROM), sharing identical pinout, control signaling (CE/OE), and 5V operation. However, it doubles the density to 4M-bit and requires updated address decoding to accommodate A18 (implemented internally as A17 extension), with no external A18 pin - the AT27C4096-55JC uses A0–A17 only.
What decoupling capacitance is required for stable operation of AT27C4096-55JC?
Per Atmel's system considerations, AT27C4096-55JC requires a 0.1 µF ceramic capacitor placed between VCC and GND as close as possible to pins 21 and 22, plus a 4.7 µF bulk electrolytic capacitor near the power entry point for arrays. These values suppress transient excursions caused by CE switching and ensure stable VCC during rapid read transitions - failure to implement them may cause data corruption or non-conformance.
AT27C4096-55JC 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:
- 55 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)
AT27C4096-55JC FAQ
1.How can I place an order for AT27C4096-55JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C4096-55JC 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 AT27C4096-55JC reliable?
The price and inventory of AT27C4096-55JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C4096-55JC is usually 5 days.
3.What payment methods are accepted for AT27C4096-55JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C4096-55JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C4096-55JC?
AT27C4096-55JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C4096-55JC 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 AT27C4096-55JC?
For technical support, including AT27C4096-55JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C4096-55JC requirements.
6.How does Aetrix verify that AT27C4096-55JC is sourced from the original manufacturer or authorized distributors?
All AT27C4096-55JC 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 AT27C4096-55JC meets industry standards.
7.What is the process for return or replacement of AT27C4096-55JC?
All AT27C4096-55JC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C4096-55JC, 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 AT27C4096-55JC part is unused and in its original packaging.
Return procedure for AT27C4096-55JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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