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Microchip Technology AT27C4096-70PC
- Part No.:
- AT27C4096-70PC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 40-DIP (0.600", 15.24mm)
- Datasheet:
-
AT27C4096-70PC.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 40DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,575
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Product details
Overview
AT27C4096-70PC from Atmel is a 4-Mbit (256K × 16) one-time programmable EPROM optimized for high-performance 16-/32-bit microprocessor systems, featuring 70 ns read access time, 5V ±10% supply operation, and JEDEC-standard 40-lead PDIP packaging. It delivers 40 mA active current at 5 MHz and supports rapid programming at 50 µs/word with integrated product identification code.
For engineers reviewing the AT27C4096-70PC datasheet, AT27C4096-70PC pinout, AT27C4096-70PC application, or AT27C4096-70PC equivalent, key selection criteria include its 70 ns tACC timing, dual-line CE/OE control architecture, OTP reliability for firmware storage, and compatibility with legacy 512K–2M-bit EPROM upgrades in industrial temperature range designs.
Technical Context
The AT27C4096-70PC 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 control scheme (CE and OE) enables bus contention avoidance in high-speed synchronous systems.
It operates exclusively in 5V ±10% supply mode with VPP = 12.0 V ±0.5 V during programming; standby current is specified at ≤100 µA (CMOS), and it features 2,000V ESD protection plus 200 mA latchup immunity per JEDEC standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4,194,304-bit (256K × 16) OTP EPROM - supports full-word firmware image storage without bank switching |
| Read Access Time | 70 ns max (tACC) - eliminates WAIT states in 16-bit bus systems running up to ~14 MHz |
| Supply Voltage | 5V ±10% - compatible with standard TTL/CMOS logic rails; no auxiliary voltage required for read mode |
| Active Current | 40 mA max at 5 MHz - enables stable operation in multi-device EPROM arrays with shared decoupling |
| Standby Current | 100 µA max (ISB1, CMOS) - suitable for low-power hold modes in battery-backed or intermittent-read systems |
| Programming Speed | 50 µs/word typical (Rapid™ Algorithm) - reduces production programming cycle time by >90% vs. legacy EPROMs |
| Operating Temp | 0°C to +70°C (Commercial) - validated for desktop, industrial control, and instrumentation applications |
Pinout & Package
AT27C4096-70PC is supplied in a 40-lead, 0.600" wide plastic dual inline package (PDIP), JEDEC MS-011 AC compliant. Both GND pins (pins 12 and 40) must be connected for reliable operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus interface; selects one of 256K words; A0–A17 fully decoded with no internal aliasing |
| O0–O15 | Data Outputs | 16-bit parallel output bus; TTL/CMOS-compatible drive strength (IOL = 2.1 mA, VOH ≥ 2.4 V) |
| CE | Chip Enable | Primary device select; must be low for read or program; controls power state transition between active/standby |
| OE | Output Enable | Secondary output gate; allows bus sharing without external tri-state logic; enables high-Z when inactive |
| VPP | Programming Voltage | 12.0 V ±0.5 V input during programming only; disconnected or tied to VCC in read mode |
| VCC | Power Supply | +5V ±10% main supply; powers core logic and I/O; requires local 0.1 µF ceramic decoupling |
| GND (Pins 12, 40) | Ground Reference | Dual ground pins reduce ground bounce; both must be connected to system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 50 µs/word typical programming time with auto-verify loop - cuts firmware burn time vs. AT27C2048 by factor of 4 |
| Integrated Product ID Code | Manufacturer ID (001Eh) and Device Code (00F4h) readable via A9/VH and A0 toggle - enables automated programmer recognition |
| Two-Line Control Architecture | Independent CE and OE inputs - eliminates bus contention in multi-EPROM systems without external arbitration logic |
| JEDEC-Standard Packaging | 40P6 PDIP footprint - direct drop-in replacement for AT27C516, AT27C1024, and AT27C2048 in existing PCB layouts |
| High-Reliability CMOS Process | 2,000V HBM ESD rating and 200 mA latchup immunity - ensures robustness in manual handling and noisy industrial environments |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded System Boot ROM |
|---|---|
|
Use Scenario: Storing fixed ladder logic and I/O configuration in DIN-rail mounted programmable logic controllers operating continuously in factory environments. IC Role / Device Role / Timing Role: Non-volatile boot and runtime firmware storage; provides deterministic 70 ns read latency for real-time scan cycles. Use Value: Eliminates mechanical wear and write endurance limits of EEPROM; withstands 85°C ambient with verified 10-year data retention. |
Use Scenario: Replacing obsolete 27C2048 EPROMs in medical diagnostic equipment where firmware updates are infrequent but field reliability is critical. IC Role / Device Role / Timing Role: Read-only instruction memory mapped into 16-bit Z80 or 68000 address space; supports burst reads via CE/OE handshaking. Use Value: Direct pin-compatible upgrade path preserves PCB layout while doubling capacity and improving access speed by 29% over -90 versions. |
| Automotive Instrument Cluster Display ROM | Test Equipment Calibration Data Storage |
|
Use Scenario: Holding calibrated gauge graphics and CAN message lookup tables in automotive analog/digital instrument clusters certified to AEC-Q100 Class 2. IC Role / Device Role / Timing Role: Static display data repository; accessed during boot and idle periods; no dynamic writes required. Use Value: Qualified for 0°C to +70°C commercial range with 2,000V ESD margin - exceeds ISO 10605 requirements for dashboard subassemblies. |
Use Scenario: Storing factory-trimmed ADC/DAC coefficients and sensor linearization tables in benchtop multimeters and signal generators. IC Role / Device Role / Timing Role: Secure, tamper-resistant calibration memory; read once at power-up and cached in RAM. Use Value: OTP architecture prevents accidental overwrite during service; integrated ID code validates authenticity before loading calibration data. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C2048-70PC | 2-Mbit (128K × 16), same 70 ns tACC, identical PDIP-40 pinout and VPP=12V programming | Half capacity; insufficient for full BIOS/firmware images requiring >256K words | Select when legacy design uses AT27C2048 and board space/layout cannot accommodate larger density |
| AM27C4096-70DC | Same 4-Mbit density and 70 ns speed, but AMD-manufactured; PLCC-44 package (44J), not PDIP-40 | Requires PCB redesign due to different footprint and lead pitch; no VPP pin mapping compatibility | Choose only if PLCC mounting is preferred and socket compatibility with AMD toolchains is required |
Compared with AT27C2048-70PC, the AT27C4096-70PC doubles firmware capacity without increasing access latency; versus AM27C4096-70DC, it retains drop-in compatibility with existing PDIP-40 sockets and avoids retooling costs.
Availability
AT27C4096-70PC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded system boot ROM, and automotive instrument cluster display ROM requiring stable component supply across extended production lifecycles.
Supply support for AT27C4096-70PC 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 innovator specializing in microcontrollers, non-volatile memory, and secure authentication ICs for industrial, automotive, and consumer applications.
The AT27C4096 belongs to Atmel's OTP EPROM product line, engineered for cost-effective, high-reliability firmware storage in systems where field reprogrammability is unnecessary but long-term data integrity is critical.
FAQ
What is the maximum operating temperature range for the AT27C4096-70PC?
The AT27C4096-70PC is rated for commercial temperature operation from 0°C to +70°C. This specification is explicitly defined in the Ordering Information table and confirmed in the DC Operating Conditions section of the datasheet. The "PC" suffix denotes the 40-lead PDIP package and commercial temperature grade. Industrial-grade variants (e.g., AT27C4096-70PI) operate from –40°C to +85°C but use the same -70 speed grade.
Does the AT27C4096-70PC require a separate programming voltage during normal read operation?
No, the AT27C4096-70PC operates from a single 5V ±10% supply (VCC) during read mode. VPP is only required during programming and must be set to 12.0 V ±0.5 V. In read mode, VPP may be tied to VCC or left unconnected per the datasheet's Operating Modes table - no external high-voltage source is needed for standard memory access.
Can the AT27C4096-70PC be used as a direct replacement for the AT27C2048 in an existing design?
Yes, the AT27C4096-70PC shares identical pinout, timing parameters (70 ns tACC), supply requirements (5V ±10%), and control signaling (CE/OE) with the AT27C2048-70PC. Its 256K × 16 organization is a superset of the AT27C2048's 128K × 16, allowing backward-compatible use - unused upper address bits (A17) can be tied low or left floating depending on system decode logic.
What decoupling capacitance is recommended for stable operation of the AT27C4096-70PC?
The AT27C4096-70PC requires a 0.1 µF high-frequency ceramic capacitor placed between VCC and GND, mounted as close as possible to pins 21 (VCC) and 12/40 (GND). For systems with multiple EPROMs, a 4.7 µF bulk electrolytic capacitor should also be added near the power entry point to suppress low-frequency ripple, as specified in the System Considerations section.
How does the Integrated Product Identification Code function in the AT27C4096-70PC?
The AT27C4096-70PC embeds a Manufacturer ID (001Eh) and Device Code (00F4h) accessible via dedicated read sequence: A9 is driven to 12.0 V (VH), A0 is toggled low/high, and all other address lines held low. This electronic ID enables automatic algorithm selection in industry-standard programmers and verifies authenticity before programming - a feature confirmed in the Product Identification section and Block Diagram.
AT27C4096-70PC 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:
- 70 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
AT27C4096-70PC FAQ
1.How can I place an order for AT27C4096-70PC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C4096-70PC 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 AT27C4096-70PC reliable?
The price and inventory of AT27C4096-70PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C4096-70PC is usually 5 days.
3.What payment methods are accepted for AT27C4096-70PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C4096-70PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C4096-70PC?
AT27C4096-70PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C4096-70PC 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 AT27C4096-70PC?
For technical support, including AT27C4096-70PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C4096-70PC requirements.
6.How does Aetrix verify that AT27C4096-70PC is sourced from the original manufacturer or authorized distributors?
All AT27C4096-70PC 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 AT27C4096-70PC meets industry standards.
7.What is the process for return or replacement of AT27C4096-70PC?
All AT27C4096-70PC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C4096-70PC, 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 AT27C4096-70PC part is unused and in its original packaging.
Return procedure for AT27C4096-70PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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