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Microchip Technology AT27C4096-70PI
- Part No.:
- AT27C4096-70PI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 40-DIP (0.600", 15.24mm)
- Datasheet:
-
AT27C4096-70PI.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 40DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,962
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Product details
Overview
AT27C4096-70PI 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 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 CMOS/TTL-compatible I/Os for seamless integration into legacy embedded firmware storage.
For engineers reviewing the AT27C4096-70PI datasheet, AT27C4096-70PI pinout, AT27C4096-70PI application, or AT27C4096-70PI equivalent, key selection considerations include its 40-pin PDIP package with verified 70 ns timing, OTP reliability for firmware boot code, and compatibility with rapid programming algorithms requiring VPP = 12.0 V ±0.5 V during programming.
Technical Context
The AT27C4096-70PI implements a parallel-addressed OTP memory architecture with 18 address lines (A0–A17) enabling full 256K-word addressing and 16-bit bidirectional data outputs (O0–O15). Its dual-control logic (CE and OE) enables bus contention avoidance in high-speed systems by supporting output float on either signal transition.
It operates exclusively in 5V read mode but requires elevated VPP (12.0 V ±0.5 V) for programming, with integrated product identification code accessible via A9 and A0 toggling. The device features 2,000V ESD protection and 200 mA latchup immunity, confirming suitability for industrial board-level environments with transient noise exposure.
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 | 70 ns max - eliminates WAIT states in 12.5 MHz CPU bus cycles |
| Supply Voltage | 5V ±10% - compatible with standard TTL/CMOS logic rails; no auxiliary voltage regulators needed |
| Operating Temperature | -40°C to +85°C - qualified for industrial-grade embedded control and instrumentation |
| Active Current | 40 mA max at 5 MHz - enables predictable power budgeting in multi-EPROM systems |
| Standby Current | 100 µA max - reduces quiescent power in low-duty-cycle firmware fetch scenarios |
| Programming Voltage | VPP = 12.0 V ±0.5 V - requires dedicated programming supply; not operable from 5V rail alone |
| ESD Protection | 2,000V HBM - ensures robustness during manual handling and PCB assembly |
Pinout & Package
AT27C4096-70PI 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. Both GND pins (Pin 20 and Pin 40) must be connected for stable operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus interface; fully decoded to select one of 256K words |
| O0–O15 | Data Outputs | 16-bit parallel data bus; high-impedance when CE or OE is inactive |
| 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 without disabling chip power |
| VPP | Programming Supply | 12.0 V input required only during programming; must be applied after and removed before VCC |
| VCC | Power Supply | 5V ±10% main supply; powers logic and output drivers during read mode |
| GND (Pins 20 & 40) | Ground Reference | Dual ground connections reduce noise coupling and ensure stable reference for 16-bit outputs |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 50 µs/word typical programming time - cuts firmware update duration vs. legacy EPROMs by >5× |
| Integrated Product ID Code | Manufacturer ID (001Eh) and Device Code (00F4h) readable via A9/A0 - enables auto-detection in universal programmers |
| Two-Line Control Architecture | Independent CE and OE inputs - permits flexible bus arbitration and partial memory disable without system reset |
| JEDEC-Standard Packaging | 40P6 PDIP footprint - direct drop-in replacement for AT27C516/AT27C1024/AT27C2048 in existing sockets |
| High-Reliability Process | 200 mA latchup immunity - prevents destructive current runaway during voltage transients on shared PCB rails |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic and I/O mapping tables in programmable logic controllers operating in factory-floor environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Non-volatile boot-time instruction store accessed directly by 16-bit microcontroller bus during cold start and watchdog recovery. Use Value: 70 ns access time ensures deterministic boot sequence under 12.5 MHz bus clock; industrial temp rating guarantees uptime across -40°C to +85°C ambient. |
Use Scenario: Providing immutable startup code for medical diagnostic instruments using aging 80C186 or Motorola 68020-based control boards. IC Role / Device Role / Timing Role: OTP EPROM serving as primary boot ROM, mapped to fixed address space with no software abstraction layer. Use Value: Direct 5V compatibility eliminates level-shifting; 40-pin PDIP matches legacy socket footprints, enabling field upgrades without PCB rework. |
| Military Avionics Configuration Memory | Test Equipment Calibration Data |
Use Scenario: Holding flight-critical configuration parameters and sensor calibration offsets in airborne mission computers where rewrite capability is prohibited. IC Role / Device Role / Timing Role: One-time-programmable configuration store accessed during pre-flight self-test sequences. Use Value: 2,000V ESD rating withstands static discharge in dry cabin environments; OTP nature prevents accidental corruption during maintenance. |
Use Scenario: Storing precision ADC/DAC trim coefficients and channel-specific linearity corrections in automated test equipment (ATE) mainframes. IC Role / Device Role / Timing Role: Read-only calibration database accessed during instrument power-up and periodic self-calibration routines. Use Value: 16-bit parallel interface enables fast coefficient loading; 100 µA standby current minimizes thermal drift in thermally sensitive analog sections. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C2048-70PI | 2-Mbit (128K × 16); identical 40P6 PDIP package, 70 ns speed, same VPP requirement | Half capacity; suitable when firmware image fits within 128K words and board layout cannot accommodate larger density | Select when legacy design uses AT27C2048 and upgrade path requires minimal validation due to pinout and timing match |
| MX27C4096PC-70 | Same 4-Mbit density and 70 ns speed; 40-pin PDIP; requires VPP = 12.5 V (±0.5 V), slightly higher than AT27C4096's 12.0 V | Functionally identical read behavior; programming algorithm differs - may require programmer firmware update | Choose for second-source continuity where Atmel supply is constrained; verify VPP tolerance margin in existing programming hardware |
Compared with AT27C2048-70PI, the AT27C4096-70PI doubles firmware storage without changing PCB layout or timing margins; versus MX27C4096PC-70, it offers tighter VPP regulation (±0.5 V at 12.0 V) and guaranteed Rapid™ algorithm support, reducing programming validation effort.
Availability
AT27C4096-70PI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded boot ROM, and military avionics configuration memory requiring stable component supply across extended lifecycle programs.
Supply support for AT27C4096-70PI 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, designed high-reliability non-volatile memory and microcontrollers for industrial, automotive, and aerospace applications before its 2016 acquisition.
The AT27C4096 belongs to Atmel's 27C-series OTP EPROM family, engineered specifically for firmware storage in resource-constrained, long-lifecycle embedded systems where data integrity and program permanence are critical.
FAQ
What is the maximum operating temperature range for the AT27C4096-70PI?
The AT27C4096-70PI is rated for industrial temperature operation from -40°C to +85°C. This specification is confirmed in the Ordering Information table and DC Operating Conditions section of the official datasheet. The "I" suffix in the part number explicitly denotes industrial grade, and thermal performance is validated across this full range with no derating required. AT27C4096-70PI maintains 70 ns access time and 40 mA active current compliance throughout this interval.
Does the AT27C4096-70PI require a separate programming voltage during normal read operation?
No, the AT27C4096-70PI operates solely from a 5V ±10% supply during read mode; VPP is disconnected or held at 5V. VPP = 12.0 V ±0.5 V is required only during programming, and the datasheet mandates that VPP be applied after VCC and removed before VCC to prevent latchup. During all read, standby, and output-disable modes, AT27C4096-70PI draws power exclusively from VCC.
Can the AT27C4096-70PI be used as a direct replacement for the AT27C2048 in an existing PDIP socket?
Yes, the AT27C4096-70PI shares the identical 40-lead PDIP (40P6) package, pinout, and 5V read-mode interface with the AT27C2048-70PI, making it a mechanical and electrical drop-in upgrade. Both devices use the same CE/OE control scheme and 16-bit data bus. However, firmware must be recompiled to utilize the full 256K address space, as AT27C4096-70PI extends addressing beyond the 128K limit of AT27C2048.
What is the purpose of the Integrated Product Identification Code in the AT27C4096-70PI?
The Integrated Product Identification Code in the AT27C4096-70PI provides manufacturer (001Eh) and device type (00F4h) identifiers readable via specific A9 and A0 pin states during power-up. This feature allows automated programming equipment to auto-detect the part and select correct voltage profiles and algorithms. It eliminates manual part selection errors and ensures AT27C4096-70PI is programmed with the Rapid™ algorithm at 50 µs/word.
How does the two-line control (CE and OE) architecture benefit system design with the AT27C4096-70PI?
The independent CE (Chip Enable) and OE (Output Enable) signals in the AT27C4096-70PI allow precise control over power state and bus drive separately. CE disables internal logic and reduces standby current to 100 µA, while OE can float outputs without powering down the array - enabling clean bus sharing in multi-master systems. This separation prevents bus contention during DMA transfers or peripheral arbitration, a key advantage over single-enable EPROMs.
AT27C4096-70PI 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:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 40-PDIP
AT27C4096-70PI FAQ
1.How can I place an order for AT27C4096-70PI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C4096-70PI 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 AT27C4096-70PI reliable?
The price and inventory of AT27C4096-70PI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C4096-70PI is usually 5 days.
3.What payment methods are accepted for AT27C4096-70PI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C4096-70PI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C4096-70PI?
AT27C4096-70PI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C4096-70PI 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 AT27C4096-70PI?
For technical support, including AT27C4096-70PI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C4096-70PI requirements.
6.How does Aetrix verify that AT27C4096-70PI is sourced from the original manufacturer or authorized distributors?
All AT27C4096-70PI 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 AT27C4096-70PI meets industry standards.
7.What is the process for return or replacement of AT27C4096-70PI?
All AT27C4096-70PI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C4096-70PI, 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 AT27C4096-70PI part is unused and in its original packaging.
Return procedure for AT27C4096-70PI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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