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Microchip Technology AT27C4096-12PC
- Part No.:
- AT27C4096-12PC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 40-DIP (0.600", 15.24mm)
- Datasheet:
-
AT27C4096-12PC.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 40DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,194
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Product details
Overview
AT27C4096-12PC from Atmel is a 4-Mbit (256K × 16) one-time programmable EPROM with 55 ns read access time, 5V ±10% supply, and JEDEC-standard 40-lead PDIP package. It delivers TTL/CMOS-compatible I/O, dual-line control (CE/OE), and supports high-performance 16-/32-bit microprocessor systems requiring nonvolatile firmware storage without wait states.
For engineers reviewing the AT27C4096-12PC datasheet, AT27C4096-12PC pinout, AT27C4096-12PC application, or AT27C4096-12PC equivalent, key selection considerations include its 55 ns tACC timing, 100 µA max standby current, 40 mA active current at 5 MHz, Rapid™ programming (50 µs/word), and compatibility with legacy AT27C2048/AT27C1024 upgrade paths.
Technical Context
The AT27C4096-12PC implements a by-16 organization with 18 address lines (A0–A17) and 16 bidirectional data outputs (O0–O15), enabling direct interface to 16-bit data buses. Its two-line control architecture (CE and OE) eliminates bus contention in high-speed systems and supports output disable and standby modes with distinct current profiles.
It uses high-reliability CMOS technology with 2,000V ESD protection and 200 mA latchup immunity. Programming requires VPP = 13.0V ±0.25V and VCC = 6.5V ±0.25V, with a verified Rapid™ algorithm that applies up to ten 50 µs CE pulses per word during verify/reprogram cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4,194,304-bit (256K × 16) OTP EPROM - enables full firmware image storage for 16-bit embedded controllers without external multiplexing. |
| Read Access Time | 55 ns max (tACC) - eliminates WAIT states in 16-/32-bit microprocessor systems operating up to ~18 MHz. |
| Supply Voltage | 5V ±10% - compatible with standard TTL/CMOS logic rails and legacy 5V system designs. |
| Standby Current | 100 µA max (ISB1, CMOS CE input) - supports low-power hold modes in battery-backed or energy-sensitive applications. |
| Active Current | 40 mA max at 5 MHz - defines thermal and power delivery requirements for sustained read operations. |
| Programming Speed | 50 µs/word typical (Rapid™ algorithm) - reduces production programming time versus conventional EPROMs. |
| ESD/Latchup | 2,000V HBM ESD protection; 200 mA latchup immunity - ensures robustness during handling and board-level operation. |
Pinout & Package
AT27C4096-12PC 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.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus interface; selects one of 256K words; A0–A17 must be stable before CE/OE assertion. |
| O0–O15 | Data Outputs | 16-bit bidirectional data bus; outputs valid within 55 ns of CE/OE low; high-impedance when CE or OE high. |
| CE | Chip Enable | Primary device select; must be low for read or program mode; controls VCC current draw and output state. |
| OE | Output Enable | Secondary output gate; allows shared bus operation; output floats when OE high, even if CE low. |
| VCC | Power Supply | +5V ±10% main supply; must be applied simultaneously with or before VPP during programming. |
| VPP | Programming Voltage | +13.0V ±0.25V required only during programming; must be removed after programming completes. |
| GND (Pins 12 & 40) | Ground Reference | Both pins must be connected to system ground; provides return path for VCC, VPP, and I/O currents. |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 50 µs/word typical programming time with automatic verify/reprogram loop - cuts production burn-in time vs. legacy EPROMs. |
| Integrated Product ID Code | Manufacturer ID (001Eh) and Device Code (00F4h) accessible via A9/VH and A0 toggle - enables auto-detection by industry-standard programmers. |
| Dual-Line Control (CE/OE) | Independent chip and output enable - supports clean bus sharing and eliminates contention in multi-device systems. |
| JEDEC Standard Packages | 40-lead PDIP (40P6), 44-lead PLCC (44J), and 40-lead VSOP (40V) - ensures drop-in replacement across form factors. |
| High-Reliability CMOS Process | 2,000V ESD rating and 200 mA latchup immunity - meets industrial handling and field reliability requirements. |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded Controller Boot ROM |
|---|---|
|
Use Scenario: Storing fixed ladder logic and I/O mapping firmware in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Nonvolatile boot memory providing deterministic 55 ns read access to instruction fetches during real-time scan cycles. Use Value: Eliminates WAIT states in 16-bit CPU execution, ensuring sub-millisecond I/O response consistency under temperature extremes (-40°C to +85°C). |
Use Scenario: Holding immutable BIOS or bootloader code in legacy 16-bit microcontroller-based instrumentation systems. IC Role / Device Role / Timing Role: OTP EPROM acting as primary boot source with guaranteed data retention >10 years and no risk of accidental overwrite. Use Value: Provides tamper-resistant, long-life firmware storage without battery backup or flash wear management overhead. |
| Automotive ECU Calibration Data | Medical Device Configuration Memory |
|
Use Scenario: Storing calibrated sensor compensation tables and actuator lookup maps in engine control units certified to AEC-Q100 Class 2. IC Role / Device Role / Timing Role: Read-only configuration memory accessed during cold start initialization with strict timing predictability. Use Value: Meets automotive qualification requirements via 200 mA latchup immunity and -40°C to +85°C industrial temp range support. |
Use Scenario: Retaining FDA-cleared device parameters and safety-critical calibration constants in diagnostic imaging subsystems. IC Role / Device Role / Timing Role: Immutable configuration store accessed during power-on self-test with zero write-cycle risk. Use Value: Ensures regulatory compliance through one-time programmability and 2,000V ESD protection for ESD-safe medical environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C2048-12PC | 2-Mbit (128K × 16), same 55 ns speed, identical PDIP-40 pinout and control signals. | Half capacity; suitable where firmware size ≤256 KB; lower cost and power in smaller designs. | Select when firmware footprint fits within 2 Mbit and BOM cost optimization is prioritized. |
| AM27C4096-12DC | Pin-compatible 4-Mbit OTP EPROM from AMD; 55 ns access, same 40-pin PDIP, but requires VPP = 12.5V (not 13.0V). | Same memory map and timing; minor VPP tolerance difference affects programmer voltage setting. | Choose for cross-supplier sourcing continuity; verify programmer VPP compliance before deployment. |
Compared with AT27C2048-12PC, the AT27C4096-12PC doubles firmware capacity while maintaining identical timing and layout; versus AM27C4096-12DC, it differs only in VPP specification (13.0V vs. 12.5V), requiring minor programmer configuration adjustment.
Availability
AT27C4096-12PC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded controller boot ROM, and automotive ECU calibration data applications requiring stable component supply over extended production lifecycles.
Supply support for AT27C4096-12PC 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 (now part of Microchip Technology) is a semiconductor manufacturer specializing in microcontrollers, nonvolatile memory, and secure authentication ICs for industrial, automotive, and consumer applications.
The AT27C4096 belongs to Atmel's OTP EPROM product line, designed specifically for reliable, high-density, pin-compatible upgrades of legacy EPROM-based systems requiring long-term data retention and zero write-cycle risk.
FAQ
What is the maximum read access time specified for AT27C4096-12PC?
The AT27C4096-12PC has a maximum read access time (tACC) of 55 ns under standard conditions (VCC = 5V ±10%, TA = 0°C to 70°C). This value is guaranteed across the commercial temperature range and enables direct interfacing with 16-bit microprocessors without WAIT-state insertion. The "-12" suffix in AT27C4096-12PC explicitly denotes this 55 ns speed grade.
Does AT27C4096-12PC require a programming voltage higher than VCC during normal operation?
No - AT27C4096-12PC operates on a single 5V ±10% supply (VCC) during read mode. VPP = +13.0V ±0.25V is required only during programming and must be applied simultaneously with or after VCC. In standby or read mode, VPP may be tied to VCC. The AT27C4096-12PC datasheet specifies that VPP must be removed before power-down to prevent leakage or damage.
Can AT27C4096-12PC be used as a direct replacement for AT27C2048 in existing PCB layouts?
AT27C4096-12PC shares the same 40-lead PDIP package, pinout, and control interface (CE/OE) as AT27C2048-12PC, making it a pin-compatible upgrade. However, AT27C4096-12PC adds address lines A16–A17 and extends the memory map to 256K words. Existing designs must validate address decoding and ensure A16/A17 are properly driven or terminated to avoid unintended access.
What decoupling capacitors are recommended for stable operation of AT27C4096-12PC?
The AT27C4096-12PC requires a 0.1 µF ceramic capacitor placed between VCC and GND, mounted as close as possible to the device's pins. For systems with multiple EPROMs, a 4.7 µF bulk electrolytic capacitor should also be added near the power entry point. These values are specified in the "System Considerations" section of the AT27C4096-12PC datasheet to suppress transient excursions during CE switching.
How does the Integrated Product Identification Code function in AT27C4096-12PC?
The AT27C4096-12PC embeds a Manufacturer ID (001Eh) and Device Code (00F4h) accessible via A9 = 12.0V and toggling A0. When A0 = VIL, the manufacturer ID appears on O15–O0; when A0 = VIH, the device code appears. This feature allows automated programmers to detect the exact part number and apply correct programming algorithms - a capability confirmed in the AT27C4096-12PC datasheet's "Product Identification" section.
AT27C4096-12PC 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:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 40-PDIP
AT27C4096-12PC FAQ
1.How can I place an order for AT27C4096-12PC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C4096-12PC 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 AT27C4096-12PC reliable?
The price and inventory of AT27C4096-12PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C4096-12PC is usually 5 days.
3.What payment methods are accepted for AT27C4096-12PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C4096-12PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C4096-12PC?
AT27C4096-12PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C4096-12PC 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 AT27C4096-12PC?
For technical support, including AT27C4096-12PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C4096-12PC requirements.
6.How does Aetrix verify that AT27C4096-12PC is sourced from the original manufacturer or authorized distributors?
All AT27C4096-12PC 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 AT27C4096-12PC meets industry standards.
7.What is the process for return or replacement of AT27C4096-12PC?
All AT27C4096-12PC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C4096-12PC, 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 AT27C4096-12PC part is unused and in its original packaging.
Return procedure for AT27C4096-12PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT27C4096-12PC Tags
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