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Microchip Technology AT27C4096-90PC
- Part No.:
- AT27C4096-90PC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 40-DIP (0.600", 15.24mm)
- Datasheet:
-
AT27C4096-90PC.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 40DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,011
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Product details
Overview
AT27C4096-90PC from Atmel is a 4-Mbit (256K × 16) one-time programmable EPROM optimized for high-performance 16-/32-bit microprocessor systems, featuring 90 ns read access time, 5V ±10% supply operation, and JEDEC-standard 40-lead PDIP 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 AT27C4096-90PC datasheet, AT27C4096-90PC pinout, AT27C4096-90PC application, or AT27C4096-90PC equivalent, key selection criteria include its OTP architecture, dual-line control (CE/OE), 2,000V ESD protection, Rapid™ programming (50 µs/word), and compatibility with legacy 512K–2M-bit EPROM upgrades.
Technical Context
The AT27C4096-90PC implements a CMOS-based OTP memory array organized as 256K words × 16 bits, accessed via 18 address lines (A0–A17) and 16 bidirectional data outputs (O0–O15). Its two-line enable architecture (CE and OE) eliminates bus contention in high-speed systems, while VPP = 12.0 V ±0.5 V enables programming without external high-voltage generators.
It supports five operating modes - Read, Output Disable, Standby, Rapid Program, and PGM Verify - controlled by CE, OE, and VPP states. The integrated Product Identification Code (Manufacturer ID: 001Eh, Device ID: 00F4h) allows automated recognition by industry-standard programmers, ensuring correct algorithm and voltage selection during production programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4,194,304 bits (256K × 16 organization) |
| Read Access Time | 90 ns maximum - eliminates WAIT states in 5 MHz microprocessor buses |
| Supply Voltage | 5 V ±10% - compatible with standard TTL/CMOS logic rails |
| Active Current | 40 mA maximum at 5 MHz - defines power budget for sustained read bursts |
| Standby Current | 100 µA maximum - enables low-power hold mode during system idle |
| ESD Protection | 2,000 V HBM - ensures robustness during handling and board assembly |
| Latchup Immunity | 200 mA - prevents destructive latchup under transient overvoltage conditions |
| Programming Speed | 50 µs per word (typical) - reduces firmware burn time in manufacturing |
Pinout & Package
AT27C4096-90PC 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 to ground for stable operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus interface; selects one of 256K memory locations |
| O0–O15 | Data Outputs | 16-bit bidirectional data bus; driven only when CE=OE=low |
| CE | Chip Enable | Primary device select; high-Z output when high, enables read/program when low |
| OE | Output Enable | Secondary output gate; controls data bus drive timing independent of CE |
| VPP | Programming Voltage | 12.0 V ±0.5 V input required only during programming; must be applied after VCC |
| VCC | Power Supply | 5 V ±10% main supply; powers logic and memory array in all modes |
| GND (Pins 20 & 40) | Ground Reference | Two dedicated ground connections required for noise immunity and thermal stability |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 50 µs/word typical programming time with built-in verify-reprogram loop up to 10 pulses |
| Integrated Product ID Code | Manufacturer ID (001Eh) and Device ID (00F4h) accessible via A9/VH and A0 toggle for auto-programmer recognition |
| Two-Line Control Architecture | Independent CE and OE inputs allow precise bus timing control and eliminate contention in multiprocessor systems |
| Direct Upgrade Path | Pins and software compatible with AT27C516 (512K), AT27C1024 (1M), and AT27C2048 (2M) EPROMs |
| JEDEC-Standard Packaging | Available in PDIP, PLCC, and VSOP - enables drop-in replacement across form factors without redesign |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded System Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic and I/O configuration in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile boot-time firmware repository accessed sequentially during cold start; requires deterministic 90 ns read latency. Use Value: Eliminates reliance on external EEPROM or flash, reducing BOM count and avoiding wear-out concerns in mission-critical control loops. |
Use Scenario: Providing immutable BIOS or bootloader code for 16-bit microcontrollers (e.g., Intel 80C188, Motorola 68000) in medical diagnostic instruments. IC Role / Device Role / Timing Role: Primary read-only instruction memory mapped into upper address space; operates at 5 MHz bus clock with no WAIT states. Use Value: Guarantees firmware integrity over 20+ year service life with zero write cycles, meeting IEC 62304 Class C safety requirements. |
| Military Avionics Configuration Memory | Test Equipment Calibration Data Storage |
Use Scenario: Holding flight-control parameter tables and sensor calibration coefficients in airborne navigation units operating across -40°C to +85°C. IC Role / Device Role / Timing Role: Radiation-tolerant OTP memory providing tamper-proof configuration data; accessed during pre-flight self-test sequences. Use Value: Delivers 200 mA latchup immunity and 2,000 V ESD protection essential for ruggedized avionics enclosures with minimal shielding. |
Use Scenario: Storing factory-trimmed DAC/ADC offset/gain coefficients and linearity correction maps in automated test equipment (ATE) mainframes. IC Role / Device Role / Timing Role: High-reliability reference data store accessed once per instrument power-up; requires guaranteed data retention >10 years. Use Value: Enables traceable calibration provenance via integrated ID code, satisfying ISO/IEC 17025 metrology audit requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C4096-90JI | Same die, industrial temperature range (-40°C to +85°C); identical pinout and timing | Required for extended-temperature deployments where ambient exceeds 70°C | Select when operating environment exceeds commercial grade limits; no PCB changes needed |
| AT27C4096-90VC | Same die, 40-lead VSOP (10 mm × 14 mm) package; 1.27 mm pitch, surface-mount | Suitable for space-constrained designs requiring SMT assembly and higher board density | Choose for modern PCB layouts prioritizing footprint reduction and reflow compatibility |
Compared with AT27C4096-90PC, the -90JI variant extends thermal reliability for harsh environments while maintaining identical electrical behavior, whereas the -90VC replaces through-hole assembly with compact surface-mount packaging - both preserve full functional and timing equivalence but address distinct mechanical and environmental constraints.
Availability
AT27C4096-90PC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded system boot ROM, military avionics configuration memory, and test equipment calibration data storage requiring stable component supply across long-lifecycle programs.
Supply support for AT27C4096-90PC 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, with a legacy of high-reliability industrial and automotive-grade components.
The AT27C4096 belongs to Atmel's OTP EPROM product line, designed specifically for applications demanding permanent, tamper-resistant firmware storage in systems where flash endurance or EEPROM write cycles are unacceptable.
FAQ
What is the maximum operating temperature range for the AT27C4096-90PC?
The AT27C4096-90PC is rated for commercial temperature operation from 0°C to +70°C. This range is explicitly defined in the Ordering Information table and confirmed in the DC Operating Conditions section. For extended-temperature use, the AT27C4096-90JI variant supports -40°C to +85°C. The AT27C4096-90PC itself must not be operated outside its specified 0°C–70°C envelope to guarantee timing compliance and data retention.
Does the AT27C4096-90PC require an external high-voltage supply for programming?
Yes, the AT27C4096-90PC requires VPP = 12.0 V ±0.5 V applied to Pin 1 during programming, as specified in the DC Programming Characteristics table. This voltage is distinct from the 5 V ±10% VCC supply used for read operations. The device does not contain an internal charge pump; external VPP generation is mandatory, and VPP must be applied after VCC and removed before VCC per the sequencing note.
Can the AT27C4096-90PC be used as a direct replacement for the AT27C2048 in existing designs?
Yes, the AT27C4096-90PC is explicitly documented as a direct upgrade from the AT27C2048 (2M-bit EPROM), sharing identical pinout, control signaling (CE/OE), and interface voltage levels. Its 256K × 16 organization maintains byte- and word-level compatibility, allowing seamless firmware expansion without layout or logic changes - provided address decoding accommodates the additional A18 line (not present in AT27C2048).
What decoupling capacitors are required for stable operation of the AT27C4096-90PC?
The AT27C4096-90PC requires a 0.1 µF ceramic capacitor placed between VCC and GND as close to the device as possible, per the System Considerations section. For boards with multiple EPROMs, a 4.7 µF bulk electrolytic capacitor must also be connected between VCC and GND near the power entry point. These values are mandated to suppress transient excursions during CE switching and stabilize supply rail integrity.
How is the Product Identification Code accessed on the AT27C4096-90PC?
The Product Identification Code on the AT27C4096-90PC is accessed by setting A9 to VH = 12.0 V ±0.5 V while holding A1–A17 low, then toggling A0: low (VIL) reads the Manufacturer ID (001Eh), and high (VIH) reads the Device ID (00F4h). This dual-word code is electrically verified and used by programmers to auto-select correct algorithms - it is not stored in user memory space.
AT27C4096-90PC 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:
- 90 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
AT27C4096-90PC FAQ
1.How can I place an order for AT27C4096-90PC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C4096-90PC 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 AT27C4096-90PC reliable?
The price and inventory of AT27C4096-90PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C4096-90PC is usually 5 days.
3.What payment methods are accepted for AT27C4096-90PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C4096-90PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C4096-90PC?
AT27C4096-90PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C4096-90PC 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 AT27C4096-90PC?
For technical support, including AT27C4096-90PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C4096-90PC requirements.
6.How does Aetrix verify that AT27C4096-90PC is sourced from the original manufacturer or authorized distributors?
All AT27C4096-90PC 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 AT27C4096-90PC meets industry standards.
7.What is the process for return or replacement of AT27C4096-90PC?
All AT27C4096-90PC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C4096-90PC, 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 AT27C4096-90PC part is unused and in its original packaging.
Return procedure for AT27C4096-90PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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