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Microchip Technology AT27C4096-12PI
- Part No.:
- AT27C4096-12PI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 40-DIP (0.600", 15.24mm)
- Datasheet:
-
AT27C4096-12PI.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 40DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,693
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Product details
Overview
AT27C4096-12PI from Atmel is a 4-Mbit (256K × 16) one-time programmable EPROM optimized for high-performance 16-/32-bit microprocessor systems, featuring 120 ns read access time, 5V ±10% supply operation, and industrial temperature range (-40°C to +85°C). It supports two-line control (CE/OE), delivers 40 mA active current at 5 MHz, and uses Rapid™ programming at 50 µs/word.
For engineers reviewing the AT27C4096-12PI datasheet, AT27C4096-12PI pinout, AT27C4096-12PI application, or AT27C4096-12PI equivalent, this OTP EPROM serves as a direct upgrade path from AT27C516/AT27C1024/AT27C2048 in firmware storage applications requiring reliable nonvolatile memory with CMOS/TTL compatibility and JEDEC-standard PDIP packaging.
Technical Context
The AT27C4096-12PI implements a by-16 organization with 18 address lines (A0–A17) and 16 bidirectional data outputs (O0–O15), enabling full 256K-word addressing without external multiplexing. Its dual-control architecture (CE and OE) eliminates bus contention during high-speed read cycles.
It operates exclusively in OTP mode with no erase capability, relying on VPP = 13.0 V ±0.25 V during programming and VCC = 6.5 V ±0.25 V for rapid write verification. Standby current is specified at ≤100 µA (CMOS) with 2,000V 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-lane splitting |
| Read Access Time | 120 ns max - eliminates WAIT states in 8–12 MHz microprocessor systems |
| Supply Voltage | 5V ±10% - compatible with standard TTL/CMOS logic rails and legacy 5V system designs |
| Active Current | 40 mA max at 5 MHz - enables stable operation in multi-device memory arrays with thermal margin |
| Standby Current | 100 µA max (CMOS) - reduces quiescent power in always-on embedded controllers |
| Programming Speed | 50 µs/word typical - cuts firmware update time vs. older EPROMs requiring >1 ms/byte |
| Operating Temperature | -40°C to +85°C - qualified for industrial control, motor drives, and factory automation environments |
Pinout & Package
AT27C4096-12PI is supplied in a 40-lead, 0.600" wide plastic dual inline package (PDIP), JEDEC MS-011 AC compliant, with 2.54 mm lead pitch and through-hole mounting. Both GND pins (Pin 20 and Pin 40) must be connected for proper noise immunity and thermal stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-word decoding; A0–A17 directly map to physical memory locations |
| O0–O15 | Data Outputs | 16-bit parallel output bus; tri-stated when CE or OE is high to prevent bus contention |
| CE | Chip Enable | Active-low global enable; controls device power state and output driver activation |
| OE | Output Enable | Active-low output gate; allows shared bus operation with other peripherals without disabling CE |
| VPP | Programming Voltage | 13.0 V ±0.25 V input required only during programming; must be applied after VCC and removed before VCC |
| VCC | Power Supply | 5V ±10% main supply; powers logic core and I/O buffers; requires local 0.1 µF ceramic decoupling |
| GND (Pins 20, 40) | Ground Reference | Dual ground connections reduce ground bounce and improve signal integrity in high-speed reads |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 50 µs/word typical programming time with built-in verify-reprogram loop ensures first-pass firmware burn reliability |
| Integrated Product Identification Code | Manufacturer ID (001Eh) and Device Code (00F4h) accessible via A9/VH and A0 toggle - enables automatic algorithm selection in production programmers |
| Two-Line Control Architecture | Independent CE and OE inputs allow precise timing control of chip select and output gating - critical for burst-mode and pipelined bus protocols |
| JEDEC-Standard PDIP Packaging | 40P6 footprint ensures drop-in replacement for legacy 27C-series EPROMs without PCB redesign |
| High-Reliability CMOS Process | 2,000V HBM ESD rating and 200 mA latchup immunity support robust operation in noisy industrial environments |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded System Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic and motion control firmware in programmable logic controllers operating in factory-floor environments with EMI and thermal cycling. IC Role / Device Role / Timing Role: Nonvolatile boot memory providing deterministic 120 ns read access to instruction fetch pipeline without wait states. Use Value: Enables deterministic real-time execution in cyclic scan-based control loops where firmware latency directly impacts servo response jitter. |
Use Scenario: Replacing obsolete 27C2048 EPROMs in medical infusion pumps and diagnostic equipment requiring long-term firmware retention and field-upgrade capability. IC Role / Device Role / Timing Role: OTP firmware repository accessed during cold start and watchdog recovery sequences. Use Value: Eliminates need for UV erasers and reprogramming infrastructure while maintaining pin-compatible upgrade path from 2M-bit predecessors. |
| Automotive Engine Control Module (ECM) | Test Equipment Configuration Memory |
Use Scenario: Holding calibration maps and emission control parameters in engine control units deployed in under-hood environments with -40°C to +85°C ambient extremes. IC Role / Device Role / Timing Role: Read-only configuration store accessed during engine cranking and closed-loop fuel trim initialization. Use Value: Industrial-grade temperature rating and 200 mA latchup immunity ensure functional safety compliance in ISO 16750-2 stress conditions. |
Use Scenario: Storing instrument-specific calibration coefficients and test sequence definitions in automated benchtop testers used in semiconductor final test. IC Role / Device Role / Timing Role: Static configuration memory mapped into tester controller's I/O space for fast parameter recall between DUT changes. Use Value: 120 ns access time enables sub-microsecond coefficient lookup, reducing per-DUT test time in high-volume production. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C4096-12JC | Same die, 44-lead PLCC package - 1.27 mm pitch, surface-mount compatible | Used in space-constrained PCBs where through-hole PDIP is impractical; requires rework of solder stencil and placement program | Select when board area is constrained and SMT assembly is available; not pin-compatible with AT27C4096-12PI due to different lead count and geometry |
| AT27C4096-12VI | Same die, 40-lead VSOP package - 10 mm × 14 mm footprint, 0.5 mm pitch | Targeted at portable and battery-powered instrumentation where height and weight are critical; lacks mechanical robustness of PDIP for vibration-prone mounts | Select for ultra-thin form factors; requires new footprint and reflow profile; incompatible with through-hole wave soldering |
Compared with AT27C4096-12JC and AT27C4096-12VI, the AT27C4096-12PI offers superior mechanical reliability in high-vibration industrial settings, simplified hand-soldering and socket-based prototyping, and full backward compatibility with legacy 40P6 sockets-making it the preferred choice for field-serviceable and repairable systems.
Availability
AT27C4096-12PI is available at Aetrix Electronics and suitable for industrial PLCs, automotive ECMs, and legacy embedded system upgrades requiring stable component supply, long-lifecycle support, and guaranteed traceability.
Supply support for AT27C4096-12PI 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, nonvolatile memory, and secure authentication ICs before its acquisition by Microchip Technology in 2016.
The AT27C4096 product line was designed for firmware storage in 16-/32-bit microprocessor systems requiring high-density, low-power, and industry-standard OTP EPROMs with rapid programming and JEDEC-compliant packaging.
FAQ
What is the maximum read access time specification for AT27C4096-12PI?
The AT27C4096-12PI has a maximum read access time of 120 ns, measured from address valid or CE/OE assertion to valid data on O0–O15 outputs. This value is guaranteed across the full industrial temperature range (-40°C to +85°C) and 5V ±10% supply, enabling direct integration into 8–12 MHz CPU buses without wait-state insertion. The "-12" suffix in AT27C4096-12PI explicitly denotes this 120 ns speed grade.
Can AT27C4096-12PI be programmed using standard 5V-only programmers?
No, AT27C4096-12PI requires a dedicated EPROM programmer capable of supplying 13.0 V ±0.25 V to the VPP pin during programming, along with 6.5 V ±0.25 V on VCC. Standard 5V-only programmers cannot meet these voltage requirements and will fail to program the device. The AT27C4096-12PI uses Atmel's Rapid™ algorithm, which relies on precise VPP timing and voltage compliance verified in the datasheet's AC Programming Characteristics table.
Does AT27C4096-12PI support erasure or reprogramming after initial programming?
No, AT27C4096-12PI is a one-time programmable (OTP) EPROM and does not support erasure or reprogramming. Once programmed, the memory contents are permanently fixed. The device lacks UV-erasable quartz window or electrical erase circuitry. Firmware updates require physical device replacement. This design ensures data integrity in safety-critical applications where accidental overwrite must be physically impossible.
What is the purpose of the dual GND pins (Pin 20 and Pin 40) on AT27C4096-12PI?
The AT27C4096-12PI features two dedicated GND pins (Pin 20 and Pin 40) to minimize ground impedance and suppress switching noise during high-speed read operations. Separating power return paths for core logic and I/O drivers reduces ground bounce, improves signal integrity on the 16-bit data bus, and ensures stable operation at 120 ns access speeds. Both pins must be connected to the system ground plane with low-inductance traces - failure to do so may cause read errors or timing violations.
How does the Integrated Product Identification Code function in AT27C4096-12PI?
The AT27C4096-12PI embeds a Manufacturer Identification Code (001Eh) and Device Code (00F4h) accessible via A9 and A0 under specific voltage conditions (A9 = 12.0 V, A0 toggled). This code allows automated programming equipment to verify device identity before applying programming algorithms and voltages, preventing misprogramming of incompatible parts. The feature is electrically implemented and fully documented in the AT27C4096-12PI datasheet's Product Identification section.
AT27C4096-12PI 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:
- 120 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
AT27C4096-12PI FAQ
1.How can I place an order for AT27C4096-12PI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C4096-12PI 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 AT27C4096-12PI reliable?
The price and inventory of AT27C4096-12PI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C4096-12PI is usually 5 days.
3.What payment methods are accepted for AT27C4096-12PI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C4096-12PI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C4096-12PI?
AT27C4096-12PI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C4096-12PI 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 AT27C4096-12PI?
For technical support, including AT27C4096-12PI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C4096-12PI requirements.
6.How does Aetrix verify that AT27C4096-12PI is sourced from the original manufacturer or authorized distributors?
All AT27C4096-12PI 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 AT27C4096-12PI meets industry standards.
7.What is the process for return or replacement of AT27C4096-12PI?
All AT27C4096-12PI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C4096-12PI, 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 AT27C4096-12PI part is unused and in its original packaging.
Return procedure for AT27C4096-12PI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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