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Microchip Technology AT27C4096-90PI
- Part No.:
- AT27C4096-90PI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 40-DIP (0.600", 15.24mm)
- Datasheet:
-
AT27C4096-90PI.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 40DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,063
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Product details
Overview
AT27C4096-90PI from Atmel is a 4-Mbit (256K × 16) one-time programmable EPROM designed for firmware storage in 16-/32-bit microprocessor systems. It features 55 ns read access time, 5V ±10% supply operation, and industrial temperature range (–40°C to +85°C). Its dual-line control (CE/OE), CMOS/TTL compatibility, and VSOP-40 package make it suitable for space-constrained embedded boot memory applications.
For engineers reviewing the AT27C4096-90PI datasheet, AT27C4096-90PI pinout, AT27C4096-90PI application, or AT27C4096-90PI equivalent, key selection considerations include its 90 ns AC timing grade, 100 µA max standby current, 40 mA active current at 5 MHz, JEDEC-standard VSOP packaging, and Rapid™ programming algorithm (50 µs/word typical).
Technical Context
The AT27C4096-90PI operates in standard read mode with CE and OE active-low control enabling high-speed bus interfacing without WAIT states. Its by-16 organization delivers 16-bit parallel data output per address cycle, directly supporting 16-bit data buses and reducing address decoding overhead in microcontroller-based systems.
It uses high-reliability CMOS technology with 2,000V ESD protection and 200 mA latchup immunity. Programming requires VPP = 13.0 V ±0.25 V and VCC = 6.5 V ±0.25 V, with a verified 50 µs CE pulse width and integrated product identification code accessible via A9 and A0 toggling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4,194,304-bit (256K × 16) OTP EPROM - supports full firmware image storage for mid-complexity embedded controllers. |
| Read Access Time | 90 ns max - ensures compatibility with 10 MHz system clocks without wait-state insertion. |
| Supply Voltage | 5V ±10% - compatible with legacy 5V logic families and eliminates need for level-shifting circuitry. |
| Standby Current | 100 µA max - enables low-power retention in battery-backed or intermittent-operation systems. |
| Active Current | 40 mA max at 5 MHz - defines thermal and power delivery requirements for sustained read bursts. |
| Programming Speed | 50 µs/word typical - reduces production programming time versus older EPROMs and improves yield in high-volume manufacturing. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade deployment in factory automation and motor control environments. |
Pinout & Package
AT27C4096-90PI is supplied in a 40-lead Plastic Thin Small Outline Package (VSOP), 10 mm × 14 mm footprint, JEDEC MO-142 CA compliant. Both GND pins must be connected for stable operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 256K-word addressing (18-bit); A0–A17 fully decoded to select one of 262,144 16-bit words. |
| O0–O15 | Data Outputs | True 16-bit parallel output bus; TTL/CMOS-compatible drive strength supports direct connection to microprocessor data lines. |
| CE | Chip Enable | Active-low global enable; controls device power state and prevents bus contention during multi-device sharing. |
| OE | Output Enable | Active-low output gate; allows independent control of data bus drivers while CE remains asserted. |
| VPP | Programming Voltage | 13.0 V ±0.25 V input required only during programming; must be applied after and removed before VCC per safety sequencing. |
| VCC | Power Supply | 5V ±10% main supply; powers logic core and I/O buffers; decoupling requires 0.1 µF ceramic capacitor near pins. |
| GND (×2) | Ground Reference | Two dedicated ground terminals reduce ground bounce and improve noise margin in high-speed read cycles. |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 50 µs/word typical programming time with automatic verify/reprogram loop - cuts production burn-in time by >60% vs. legacy EPROMs. |
| Integrated Product ID Code | Manufacturer ID (001Eh) and Device Code (00F4h) readable via A9/VH and A0 toggle - enables automated programmer validation and BOM traceability. |
| JEDEC-Standard Packages | VSOP-40 (10 mm × 14 mm) footprint - provides drop-in replacement path for AT27C2048/AT27C1024 in existing PCB layouts with minimal rework. |
| Two-Line Control Architecture | Independent CE and OE inputs - eliminates bus contention in shared-memory systems and supports pipelined read sequences. |
| High-Reliability CMOS Process | 2,000V HBM ESD rating and 200 mA latchup immunity - ensures robustness in handling-sensitive industrial assembly and field service environments. |
Applications
| Industrial PLC Firmware Storage | Medical Device Boot ROM |
|---|---|
Use Scenario: Storing immutable boot firmware and safety-critical configuration tables in programmable logic controllers deployed in factory-floor environments. IC Role / Device Role / Timing Role: Non-volatile boot memory providing deterministic 90 ns read access to initialize FPGA configuration and real-time OS kernel. Use Value: Eliminates reliance on external flash controllers; 100 µA standby current extends backup battery life during power-loss events. |
Use Scenario: Holding certified bootloader and regulatory-compliant diagnostic routines in Class II medical instruments requiring long-term data integrity. IC Role / Device Role / Timing Role: OTP EPROM serving as tamper-resistant root-of-trust memory, accessed during cold-start sequence prior to RAM initialization. Use Value: One-time programmability prevents unauthorized firmware modification; industrial temp range ensures reliability across clinical operating conditions. |
| Automotive Engine Control Unit (ECU) | Test & Measurement Equipment Calibration Data |
Use Scenario: Storing engine calibration maps and emission control parameters in Tier-1 automotive ECUs where firmware revision stability is mandated. IC Role / Device Role / Timing Role: Read-only memory mapped into microcontroller address space for real-time lookup of fuel injection timing tables. Use Value: 5V operation matches legacy automotive MCU voltage domains; 90 ns access avoids pipeline stalls in 10 MHz CAN-based control loops. |
Use Scenario: Retaining factory-calibrated ADC offset/gain coefficients and sensor linearization curves in benchtop oscilloscopes and spectrum analyzers. IC Role / Device Role / Timing Role: Static configuration memory accessed once at power-up to configure analog front-end precision circuitry. Use Value: VSOP-40 package fits dense PCB layouts; integrated ID code enables automated calibration verification during final test. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C2048-90PI | 2-Mbit (128K × 16), same 90 ns speed grade and VSOP-40 package. | Half memory capacity; suitable for smaller firmware images or legacy designs with fixed 128K address space. | Select when board layout or software constraints limit usable memory size and full 4-Mbit capacity is unnecessary. |
| AM27C4096-90DC | 4-Mbit (256K × 16), 90 ns speed, but in 44-pin PLCC package (not VSOP); identical electrical specs except package footprint. | Requires PCB redesign due to different pin count, pitch, and mounting geometry; no pin-to-pin compatibility with AT27C4096-90PI. | Choose only if PLCC socket infrastructure exists and VSOP rework is cost-prohibitive; verify thermal derating for PLCC in target enclosure. |
Compared with AT27C2048-90PI, the AT27C4096-90PI doubles firmware capacity without increasing access latency or power draw; versus AM27C4096-90DC, it offers identical functionality in a smaller, surface-mount VSOP package-reducing board area by 32% and enabling higher-density routing.
Availability
AT27C4096-90PI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device boot ROM, and automotive ECU calibration data requiring stable component supply over extended production lifecycles.
Supply support for AT27C4096-90PI 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 belongs to Atmel's OTP EPROM product line, engineered for reliable, low-cost firmware storage in systems where code immutability, long-term data retention, and 5V compatibility are critical design requirements.
FAQ
What is the maximum read access time specified for AT27C4096-90PI?
The AT27C4096-90PI has a maximum read access time of 90 ns under industrial temperature conditions (–40°C to +85°C) and 5V ±10% supply. This value is guaranteed across all operating corners and reflects the worst-case delay from address valid to stable data output when both CE and OE are asserted low.
Does AT27C4096-90PI require a programming voltage during normal read operation?
No, AT27C4096-90PI operates solely from a 5V ±10% supply during read mode. VPP (13.0 V ±0.25 V) is required only during programming and must be sequenced after VCC application and before VCC removal. In read mode, VPP may be tied to VCC or left unconnected depending on system design.
Can AT27C4096-90PI be used as a direct replacement for AT27C2048 in an existing design?
Yes, AT27C4096-90PI is a functional upgrade from AT27C2048 with identical pinout, timing interface, and VSOP-40 package. Its 4-Mbit capacity doubles storage while maintaining 90 ns access time and 5V operation-enabling firmware expansion without PCB changes, provided address decoding supports A18.
What decoupling capacitance is recommended for AT27C4096-90PI?
A 0.1 µF high-frequency ceramic capacitor must be placed between VCC and GND as close as possible to the AT27C4096-90PI package. For systems with multiple EPROMs, a 4.7 µF bulk electrolytic capacitor should also be added near the power entry point to stabilize rail voltage during simultaneous output transitions.
How is the Integrated Product Identification Code accessed on AT27C4096-90PI?
The AT27C4096-90PI ID code is read by setting A9 to VH (12.0 V ±0.5 V), holding A1–A17 low, and toggling A0: low selects Manufacturer ID (001Eh), high selects Device Code (00F4h). Both CE and OE must be low, and VCC must be at nominal 5V during this operation.
AT27C4096-90PI 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:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 40-PDIP
AT27C4096-90PI FAQ
1.How can I place an order for AT27C4096-90PI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C4096-90PI 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 AT27C4096-90PI reliable?
The price and inventory of AT27C4096-90PI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C4096-90PI is usually 5 days.
3.What payment methods are accepted for AT27C4096-90PI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C4096-90PI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C4096-90PI?
AT27C4096-90PI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C4096-90PI 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 AT27C4096-90PI?
For technical support, including AT27C4096-90PI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C4096-90PI requirements.
6.How does Aetrix verify that AT27C4096-90PI is sourced from the original manufacturer or authorized distributors?
All AT27C4096-90PI 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 AT27C4096-90PI meets industry standards.
7.What is the process for return or replacement of AT27C4096-90PI?
All AT27C4096-90PI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C4096-90PI, 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 AT27C4096-90PI part is unused and in its original packaging.
Return procedure for AT27C4096-90PI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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