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Microchip Technology AT27C4096-55PI
- Part No.:
- AT27C4096-55PI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 40-DIP (0.600", 15.24mm)
- Datasheet:
-
AT27C4096-55PI.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 40DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,989
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Product details
Overview
AT27C4096-55PI from Atmel is a 4-Mbit (256K × 16) one-time programmable EPROM optimized for high-performance 16-/32-bit microprocessor systems, featuring 55 ns read access time, 5V ±10% supply operation, and industrial temperature range (–40°C to +85°C). It supports dual-line control (CE/OE), delivers 40 mA active current at 5 MHz, and uses CMOS/TTL-compatible I/O.
For engineers reviewing the AT27C4096-55PI datasheet, AT27C4096-55PI pinout, AT27C4096-55PI application, or AT27C4096-55PI equivalent, key selection criteria include OTP reliability for firmware storage, fast 55 ns access eliminating WAIT states, industrial-grade thermal stability, and compatibility with legacy 27C-series programming infrastructure.
Technical Context
The AT27C4096-55PI implements a by-16 organization with 18 address lines (A0–A17) enabling direct interface to 16-bit data buses and efficient memory mapping in embedded controllers. Its two-line enable architecture (CE and OE) ensures bus contention avoidance during high-speed read cycles.
It employs Atmel's Rapid™ Programming Algorithm with 50 µs/word typical programming time and integrated product identification code (Manufacturer ID: 001Eh, Device ID: 00F4h) for automated programmer recognition. Programming requires VPP = 13.0 V ±0.25 V and VCC = 6.5 V ±0.25 V, with strict sequencing (VCC applied before/removed after VPP).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4,194,304 bits (256K × 16) - supports full firmware images for mid-complexity microcontrollers without bank switching. |
| Read Access Time | 55 ns max - enables zero-WAIT-state operation with 18 MHz CPU buses in industrial systems. |
| Supply Voltage | 5 V ±10% - compatible with standard TTL/CMOS logic rails; no auxiliary voltage regulators required. |
| Active Current | 40 mA max at 5 MHz - low power consumption during sustained read bursts in battery-backed or thermally constrained designs. |
| Standby Current | 100 µA max - minimizes quiescent drain in always-on embedded systems with periodic firmware access. |
| Operating Temperature | –40°C to +85°C - qualified for industrial control, motor drives, and outdoor instrumentation environments. |
| ESD Protection | 2,000 V HBM - enhances robustness during board handling and field deployment in unshielded enclosures. |
Pinout & Package
AT27C4096-55PI is supplied in a 40-lead, 0.600" wide plastic dual inline package (PDIP), JEDEC MS-011 AC compliant, with 0.100" lead pitch and through-hole mounting. 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 is LSB, A17 is MSB. |
| O0–O15 | Data Outputs | 16-bit bidirectional data bus outputs; driven only when CE = OE = low; high-impedance otherwise. |
| CE | Chip Enable | Primary device select; must be low for read or program operations; controls global output enable and internal array activation. |
| OE | Output Enable | Secondary output gate; allows output float control independent of CE to prevent bus contention in shared-memory systems. |
| VPP | Programming Voltage | 13.0 V ±0.25 V input during programming; must be sequenced after VCC and removed before VCC to avoid latchup. |
| VCC | Power Supply | 5 V ±10% main supply; powers logic and memory array; requires local 0.1 µF ceramic decoupling per device. |
| GND (Pins 20, 40) | Ground Reference | Dual ground connections reduce noise coupling and ensure stable reference for both core logic and output drivers. |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 50 µs/word typical programming time with auto-verify loop - reduces firmware update cycle time by >70% vs. legacy EPROMs. |
| Integrated Product Identification Code | Manufacturer ID (001Eh) and Device ID (00F4h) readable via A9/VH and A0 toggle - enables plug-and-play support in industry-standard programmers. |
| Two-Line Control Architecture | Independent CE and OE inputs - permits flexible bus arbitration and eliminates external gating logic in multi-device memory maps. |
| JEDEC-Standard Packaging | 40P6 PDIP footprint - allows drop-in replacement of AT27C516, AT27C1024, and AT27C2048 in existing industrial PCBs. |
| High-Reliability Process | 200 mA latchup immunity and 2,000 V ESD protection - ensures survivability in factory automation and power-conversion environments. |
Applications
| Industrial PLC Firmware Storage | Medical Device Boot ROM |
|---|---|
|
Use Scenario: Storing immutable boot firmware and safety-critical control algorithms in programmable logic controllers deployed in factory floors with ambient temperatures up to 85°C. IC Role / Device Role / Timing Role: Non-volatile boot ROM providing deterministic 55 ns instruction fetch timing to ensure real-time scan-cycle compliance. Use Value: Eliminates WAIT states during startup and runtime code execution, reducing worst-case scan time by up to 12% versus slower EPROM alternatives. |
Use Scenario: Holding certified bootloader and diagnostic routines in Class II medical instruments requiring long-term data retention and regulatory traceability. IC Role / Device Role / Timing Role: OTP EPROM serving as tamper-resistant, non-rewritable firmware vault with guaranteed 10-year data retention at 85°C. Use Value: Meets IEC 62304 §5.5.2 requirements for fixed software components via one-time programmability and manufacturer-verified ID codes. |
| Automotive Engine Control Unit (ECU) | Avionics Configuration Memory |
|
Use Scenario: Storing calibration tables and emission control logic in engine management systems operating across –40°C to +85°C under vibration and EMI stress. IC Role / Device Role / Timing Role: Read-only configuration memory interfaced directly to 16-bit MCUs (e.g., Motorola 68332), delivering sub-60 ns timing margins. Use Value: Industrial temperature rating and 200 mA latchup immunity prevent runtime corruption during load-dump transients on 12 V vehicle buses. |
Use Scenario: Retaining flight-critical configuration parameters (e.g., sensor scaling, fail-safe thresholds) in airborne navigation modules with DO-254 compliance requirements. IC Role / Device Role / Timing Role: Secure, non-volatile parameter store accessed during power-up initialization with deterministic 55 ns latency. Use Value: Integrated product ID codes enable automated verification during production programming, satisfying DO-254 tool qualification traceability. |
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, identical specs, but in commercial temperature range (0°C to 70°C) and same 40P6 PDIP package. | Not rated for industrial ambient extremes; unsuitable for factory-floor or automotive under-hood use. | Select only for cost-sensitive, indoor, temperature-controlled applications where extended thermal range is unnecessary. |
| AM27C4096-55DC | AMD second-source version; identical 55 ns access, 256K×16 organization, and PDIP packaging; minor differences in programming voltage tolerance (12.5 V ±0.5 V vs. 13.0 V ±0.25 V). | Requires revalidation of programming algorithm timing in existing production tools due to tighter VPP tolerance. | Use only when dual-sourcing is mandated by procurement policy; verify VPP regulation stability in existing programmers. |
Compared with AT27C4096-55PC, the AT27C4096-55PI provides guaranteed operation down to –40°C - critical for outdoor or mobile equipment - while AM27C4096-55DC offers supply-chain redundancy but demands VPP calibration adjustments in legacy programming workflows.
Availability
AT27C4096-55PI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device boot ROM, and automotive ECU calibration memory requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AT27C4096-55PI 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 security ICs, acquired by Microchip Technology in 2016. Its legacy memory products remain widely deployed in industrial systems.
The AT27C4096 belongs to Atmel's 27C-series OTP EPROM family, designed specifically for reliable, high-density firmware storage in resource-constrained embedded systems where EEPROM endurance or Flash write complexity is undesirable.
FAQ
What is the maximum operating temperature range for the AT27C4096-55PI?
The AT27C4096-55PI is rated for industrial temperature operation from –40°C to +85°C. This specification is validated per JEDEC JESD22-A108 and confirmed in the device's Ordering Information table, where the "I" suffix explicitly denotes industrial grade. Operation outside this range may result in timing violations or data retention loss.
Does the AT27C4096-55PI require a programming voltage higher than VCC during normal operation?
No - the AT27C4096-55PI operates at 5 V ±10% (VCC) during read mode only. VPP = 13.0 V is required exclusively during programming and must be disconnected or held at VCC level (≤5.5 V) during all other modes. The datasheet mandates strict sequencing: VCC must be applied before and removed after VPP to prevent latchup.
How many address lines does the AT27C4096-55PI have, and what memory size do they support?
The AT27C4096-55PI has 18 address lines (A0–A17), supporting its 256K-word (256 × 1024) organization. With a 16-bit data bus (O0–O15), this yields 4,194,304 total bits (4 Mbit). Each address selects one 16-bit word, enabling direct connection to 16-bit microprocessors without external address decoding logic.
Can the AT27C4096-55PI be used as a direct replacement for the AT27C2048 in an existing design?
Yes - the AT27C4096-55PI is explicitly documented as a direct upgrade path from AT27C2048 (2 Mbit), AT27C1024 (1 Mbit), and AT27C516 (512 Kbit). It shares identical pinout, voltage levels, and control signaling in 40P6 PDIP packaging, allowing PCB reuse without layout changes, provided address/data bus width and timing margins accommodate the larger memory map.
What decoupling capacitance is required for stable operation of the AT27C4096-55PI?
The AT27C4096-55PI requires a minimum 0.1 µF high-frequency ceramic capacitor between VCC and GND, placed as close as possible to Pins 19 (VCC) and 20 (GND). For systems with multiple devices, a bulk 4.7 µF electrolytic capacitor should also be added near the power entry point to suppress low-frequency ripple and transient coupling.
AT27C4096-55PI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 40-DIP (0.600", 15.24mm)
- 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:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 40-PDIP
AT27C4096-55PI FAQ
1.How can I place an order for AT27C4096-55PI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C4096-55PI 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 AT27C4096-55PI reliable?
The price and inventory of AT27C4096-55PI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C4096-55PI is usually 5 days.
3.What payment methods are accepted for AT27C4096-55PI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C4096-55PI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C4096-55PI?
AT27C4096-55PI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C4096-55PI 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 AT27C4096-55PI?
For technical support, including AT27C4096-55PI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C4096-55PI requirements.
6.How does Aetrix verify that AT27C4096-55PI is sourced from the original manufacturer or authorized distributors?
All AT27C4096-55PI 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 AT27C4096-55PI meets industry standards.
7.What is the process for return or replacement of AT27C4096-55PI?
All AT27C4096-55PI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C4096-55PI, 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 AT27C4096-55PI part is unused and in its original packaging.
Return procedure for AT27C4096-55PI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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