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Microchip Technology AT27C4096-55PC
- Part No.:
- AT27C4096-55PC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 40-DIP (0.600", 15.24mm)
- Datasheet:
-
AT27C4096-55PC.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 40DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,537
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Product details
Overview
AT27C4096-55PC from Atmel is a 4-Mbit (256K × 16) one-time programmable EPROM optimized for high-speed read access in 16-/32-bit microprocessor systems. It delivers 55 ns address-to-output delay, operates on 5V ±10% supply, and supports commercial temperature range (0°C to 70°C) in 40-lead PDIP package. Used for firmware storage where non-volatility, reliability, and bus-compatible timing are critical.
For engineers reviewing the AT27C4096-55PC datasheet, AT27C4096-55PC pinout, AT27C4096-55PC application, or AT27C4096-55PC equivalent, key selection criteria include read access time, standby current, JEDEC-standard PDIP compatibility, OTP programming voltage requirements, and dual-line control (CE/OE) architecture for bus contention avoidance.
Technical Context
The AT27C4096-55PC implements a CMOS-based OTP memory array with 256K words × 16-bit organization, accessed via 18 address lines (A0–A17) and 16 bidirectional data outputs (O0–O15). Its two-line enable architecture (CE and OE) enables precise output gating and eliminates bus contention during high-speed read cycles.
It uses Atmel's Rapid™ Programming Algorithm with 50 µs/word typical programming pulse width at VPP = 13.0 V and VCC = 6.5 V, and includes integrated product identification code accessible via A9 and A0 toggling - enabling automatic algorithm selection in industry-standard programmers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4,194,304 bits (256K × 16), enabling full firmware images for mid-complexity embedded controllers without external banking logic |
| Read Access Time | 55 ns max (tACC), eliminating WAIT states in 5 MHz bus systems |
| Supply Voltage | 5V ±10%, compatible with standard TTL/CMOS logic rails and legacy 5V system designs |
| Standby Current | 100 µA max (ISB1), supporting low-power hold modes in battery-backed or energy-sensitive applications |
| Active Current | 40 mA max at 5 MHz, defining thermal and power delivery requirements for sustained read bursts |
| Programming Voltage | VPP = 13.0 V ±0.25 V required only during programming - not needed in normal operation |
| ESD Protection | 2,000V HBM, ensuring robustness during handling and board assembly in non-EPA environments |
Pinout & Package
AT27C4096-55PC is supplied in a 40-lead, 0.600" wide plastic dual in-line package (PDIP), JEDEC MS-011 AC compliant, with 2.54 mm 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 fully decoded) |
| O0–O15 | Data Outputs | 16-bit bidirectional data bus; outputs valid when CE=OE=low, high-Z otherwise |
| CE | Chip Enable | Primary device select; must be low for read or program operations; controls VCC current draw |
| OE | Output Enable | Secondary output gate; allows shared bus operation by disabling outputs without deselecting chip |
| VPP | Programming Supply | 13 V input required only during programming; must be applied after and removed before VCC |
| VCC | Power Supply | 5 V ±10% main supply; powers logic and memory array during read and programming |
| GND (Pins 12 & 40) | Ground Reference | Both pins must be connected to system ground to meet ESD and latchup immunity specs |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 50 µs/word typical programming time reduces production burn-in cycle duration and improves throughput |
| Integrated Product ID Code | Manufacturer (001Eh) and device code (00F4h) readable via A9/A0 control - enables auto-detection in universal programmers |
| Two-Line Control (CE/OE) | Independent chip and output enables allow interleaved reads across multiple devices on same data bus |
| JEDEC Standard Packages | 40-lead PDIP (40P6) ensures drop-in replacement for legacy EPROM sockets without PCB redesign |
| CMOS/TTL Compatibility | Input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V) and output drive (2.1 mA sink, –400 µA source) support mixed-logic systems |
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 operating in factory-floor environments with wide temperature swings. IC Role / Device Role / Timing Role: Non-volatile boot memory providing deterministic 55 ns read access to instruction fetches during cold start and runtime reinitialization. Use Value: Eliminates reliance on slow serial EEPROM or volatile RAM + backup battery; withstands 2,000V ESD and 200 mA latchup events common in industrial noise environments. |
Use Scenario: Replacing obsolete 27C2048 EPROMs in aging medical diagnostic equipment requiring long-term firmware stability and zero field updates. IC Role / Device Role / Timing Role: Pin-compatible OTP upgrade path delivering 2× density (256K × 16 vs. 128K × 8) while maintaining identical PDIP footprint and 5V interface. Use Value: Enables consolidation of dual 27C2048 devices into single AT27C4096-55PC, reducing component count and improving board-level reliability. |
| Automotive Instrument Cluster Calibration Data | Avionics Configuration Memory |
Use Scenario: Holding calibrated sensor offsets and display lookup tables in automotive dashboards qualified for 0°C to 70°C operation. IC Role / Device Role / Timing Role: Read-only configuration store accessed during power-on self-test (POST) with guaranteed tACC ≤ 55 ns for deterministic boot timing. Use Value: Meets AEC-Q100-relevant reliability benchmarks (2,000V ESD, 200 mA latchup immunity) without requiring additional protection circuitry. |
Use Scenario: Storing flight-critical initialization parameters in certified avionics subsystems where write-once integrity prevents accidental corruption. IC Role / Device Role / Timing Role: Tamper-resistant, non-rewritable memory used during cold boot to load FPGA configuration or DSP coefficient tables. Use Value: OTP architecture guarantees immutable content post-programming - no risk of bit flips or overwrite during EMI exposure or power transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C4096-55JC | Same die, 44-lead PLCC package instead of 40-lead PDIP; requires socket or layout change | Suitable for surface-mount production lines or space-constrained boards where through-hole PDIP is impractical | Select when board design uses PLCC footprints or automated SMT assembly is preferred over through-hole insertion |
| AT27C4096-55VC | Same die, 40-lead VSOP (10 mm × 14 mm) thin profile package; 1.2 mm height vs. PDIP's 3.3 mm | Used in portable or stacked-module designs where Z-height is constrained and thermal mass is lower | Select when mechanical envelope limits vertical clearance or when JEDEC MO-142 CA footprint is already standardized |
Compared with AT27C4096-55JC and AT27C4096-55VC, the AT27C4096-55PC offers direct compatibility with legacy 40-pin DIP sockets and simplified hand-soldering or wave-soldering processes - making it optimal for repair, prototyping, and low-volume industrial builds where footprint interchangeability is prioritized over miniaturization.
Availability
AT27C4096-55PC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded system boot ROM, and automotive instrument cluster calibration data requiring stable component supply and long-lifecycle support.
Supply support for AT27C4096-55PC 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, non-volatile memory, and secure authentication ICs for industrial, automotive, and consumer applications.
The AT27C4096-55PC belongs to Atmel's legacy OTP EPROM product line, designed specifically to replace older UV-erasable EPROMs with higher-density, faster-read, and more reliable one-time programmable alternatives for firmware and configuration storage.
FAQ
What is the maximum read access time specified for AT27C4096-55PC?
The AT27C4096-55PC has a maximum address-to-output delay (tACC) of 55 ns under standard read conditions (VCC = 5V ±10%, TA = 25°C, CL = 100 pF). This value is guaranteed across the commercial temperature range (0°C to 70°C) and defines the worst-case timing for instruction or data fetches in synchronous bus systems.
Does AT27C4096-55PC require a programming voltage during normal operation?
No, AT27C4096-55PC does not require VPP during normal read operation. VPP = 13.0 V ±0.25 V is only applied during programming - and must be sequenced after VCC and removed before VCC per datasheet requirements. In read mode, only 5V ±10% on VCC is needed.
Can AT27C4096-55PC be used as a direct replacement for AT27C2048 in existing designs?
Yes, AT27C4096-55PC is explicitly positioned as a direct upgrade from AT27C2048 (2M-bit) EPROMs. It shares identical pinout in PDIP package, same 5V supply, and compatible CE/OE control - but doubles density to 4M-bit (256K × 16), allowing consolidation or future firmware expansion without hardware changes.
What is the purpose of the Integrated Product Identification Code in AT27C4096-55PC?
The Integrated Product Identification Code in AT27C4096-55PC provides electronic manufacturer (001Eh) and device type (00F4h) identification via A9 and A0 pin control. This allows automated programming equipment to verify part authenticity and auto-select correct algorithms and voltages - reducing setup errors and improving yield in high-volume programming.
How many ground connections does AT27C4096-55PC require, and why?
AT27C4096-55PC requires both GND pins (pins 12 and 40) to be connected to system ground. This dual-ground configuration is mandatory to achieve specified 2,000V ESD protection and 200 mA latchup immunity - separating signal return paths improves noise rejection and ensures compliance with JEDEC MS-011 AC mechanical and electrical standards.
AT27C4096-55PC 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:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 40-PDIP
AT27C4096-55PC FAQ
1.How can I place an order for AT27C4096-55PC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C4096-55PC 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 AT27C4096-55PC reliable?
The price and inventory of AT27C4096-55PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C4096-55PC is usually 5 days.
3.What payment methods are accepted for AT27C4096-55PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C4096-55PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C4096-55PC?
AT27C4096-55PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C4096-55PC 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 AT27C4096-55PC?
For technical support, including AT27C4096-55PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C4096-55PC requirements.
6.How does Aetrix verify that AT27C4096-55PC is sourced from the original manufacturer or authorized distributors?
All AT27C4096-55PC 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 AT27C4096-55PC meets industry standards.
7.What is the process for return or replacement of AT27C4096-55PC?
All AT27C4096-55PC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C4096-55PC, 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 AT27C4096-55PC part is unused and in its original packaging.
Return procedure for AT27C4096-55PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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