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Microchip Technology AT27C4096-12VI
- Part No.:
- AT27C4096-12VI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 40-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
AT27C4096-12VI.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 40VSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,025
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Product details
Overview
AT27C4096-12VI from Atmel is a 4-Mbit (256K × 16) one-time programmable EPROM optimized for high-performance 16-/32-bit microprocessor systems, featuring 120 ns read access time, 5V ±10% supply operation, and industrial temperature range (-40°C to +85°C). It supports rapid programming at 50 µs/word and delivers 40 mA active current at 5 MHz while maintaining ≤100 µA standby current.
For engineers reviewing the AT27C4096-12VI datasheet, AT27C4096-12VI pinout, AT27C4096-12VI application, or AT27C4096-12VI equivalent, key selection criteria include JEDEC-standard 40-lead VSOP package compatibility, dual-line CE/OE control for bus contention avoidance, integrated product identification code, and direct upgrade path from AT27C516/AT27C1024/AT27C2048 EPROMs.
Technical Context
The AT27C4096-12VI implements a CMOS OTP EPROM architecture with by-16 organization, enabling full-word parallel access without WAIT states in 16-/32-bit data buses. Its two-line control (CE and OE) decouples chip selection from output gating, supporting high-speed multiplexed bus systems.
It uses Atmel's Rapid™ Programming Algorithm with 13 V VPP during programming, verified via internal identifier words accessible through A9 and A0 toggling. The device integrates ESD protection (2,000 V) and latchup immunity (200 mA), meeting industrial reliability requirements for firmware storage in embedded controllers and legacy system upgrades.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4,194,304 bits (256K × 16), enabling full firmware image storage for mid-complexity microcontrollers |
| Read Access Time | 120 ns max - eliminates WAIT states in 8-MHz Z80 or 10-MHz 80286-based designs |
| Supply Voltage | 5V ±10% - compatible with standard TTL/CMOS logic rails without regulation overhead |
| Active Current | 40 mA max at 5 MHz - supports burst-read operation in real-time control loops |
| Standby Current | 100 µA max - enables low-power retention in battery-backed industrial modules |
| Programming Voltage | VPP = 13.0 V ±0.25 V - requires dedicated programming hardware, not system-level voltage |
| Operating Temperature | -40°C to +85°C - qualified for industrial automation, motor drives, and telecom line cards |
Pinout & Package
AT27C4096-12VI is supplied in a 40-lead Plastic Thin Small Outline Package (VSOP), 10 mm × 14 mm footprint, JEDEC MO-142 CA compliant, with 1.27 mm lead pitch and gull-wing terminations suitable for surface-mount reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-word decoding; A0–A17 must be stable before CE/OE assertion |
| O0–O15 | Data Outputs | True 16-bit bidirectional data bus; outputs float when CE=VIH or OE=VIH to prevent bus contention |
| CE | Chip Enable | Active-low primary selection signal; controls power state transition between standby (VIH) and active (VIL) |
| OE | Output Enable | Active-low secondary gating signal; enables output drivers only when CE is also asserted |
| VCC | Power Supply | +5V ±10% main supply; must be applied simultaneously with or before VPP during programming |
| VPP | Programming Voltage | +13.0V ±0.25V input for OTP programming; disconnected during normal read operation |
| GND (Pins 20 & 40) | Ground Reference | Two dedicated ground pins required for noise immunity; both must be connected per datasheet note |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 50 µs/word typical programming time reduces firmware update cycle time by >70% vs. legacy EPROMs |
| Integrated Product Identification Code | Manufacturer ID (001Eh) and Device Code (00F4h) readable via A9/VH and A0 toggle - enables auto-detection in universal programmers |
| JEDEC Standard Packages | 40-lead VSOP (10×14 mm) footprint ensures drop-in replacement for AT27C2048-12VC in space-constrained PCBs |
| 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 interfacing |
| High Reliability Design | 2,000 V HBM ESD rating and 200 mA latchup immunity allow robust operation in noisy factory-floor environments |
Applications
| Industrial PLC Firmware Storage | Legacy Microprocessor System Upgrade |
|---|---|
Use Scenario: Storing ladder logic firmware and I/O configuration tables in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Non-volatile program memory providing deterministic 120 ns read latency for scan-cycle execution. Use Value: Enables field-upgradable firmware without requiring battery-backed SRAM or external flash controllers. |
Use Scenario: Replacing obsolete 2M-bit EPROMs (e.g., AT27C2048) in 1990s-era test equipment and CNC motion controllers. IC Role / Device Role / Timing Role: Pin-compatible OTP memory with identical 40-pin VSOP footprint and CE/OE timing interface. Use Value: Direct upgrade path preserves existing PCB layout while doubling storage capacity for enhanced diagnostics and calibration data. |
| Telecom Line Card Boot ROM | Automotive Engine Control Module (ECU) Calibration Data |
Use Scenario: Holding boot code and protocol stack initialization routines in T1/E1 framing ICs and channel banks. IC Role / Device Role / Timing Role: Read-only instruction memory accessed during cold start; operates across -40°C to +85°C ambient. Use Value: Eliminates reliance on slower serial EEPROM or volatile RAM with backup batteries in telecom infrastructure. |
Use Scenario: Storing engine trim tables, fuel mapping coefficients, and emission calibration constants in pre-OBD-II ECUs. IC Role / Device Role / Timing Role: Immutable calibration storage with guaranteed 10-year data retention under thermal cycling stress. Use Value: Ensures regulatory compliance and consistent emissions performance without risk of accidental overwrite or corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C4096-12PC | Same die, 40-lead PDIP package (0.600" width); higher profile, through-hole mounting | Suitable for prototyping, lab validation, or legacy through-hole production lines | Select when board assembly uses wave soldering or requires mechanical serviceability |
| AT27C4096-12JI | Same die, 44-lead PLCC package; different pinout, larger footprint (16.7 mm square) | Used where PLCC sockets enable field-replaceable firmware modules | Select when socket-based firmware updates or hot-swap capability is required |
Compared with AT27C4096-12PC and AT27C4096-12JI, the AT27C4096-12VI offers the smallest PCB area (10×14 mm), best thermal dissipation for dense layouts, and compatibility with automated SMT lines - making it optimal for volume-manufactured industrial electronics where space and assembly efficiency are critical.
Availability
AT27C4096-12VI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy microprocessor system upgrades, telecom line card boot ROM, and automotive ECU calibration data applications requiring stable component supply across extended product lifecycles.
Supply support for AT27C4096-12VI 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 devices.
The AT27C4096 belongs to Atmel's OTP EPROM product line, designed specifically for reliable, cost-effective firmware and calibration storage in industrial, telecom, and automotive systems where write-once permanence and long-term data integrity are essential.
FAQ
What is the maximum operating frequency supported by the AT27C4096-12VI?
The AT27C4096-12VI does not operate at a clock frequency itself but supports system bus frequencies up to approximately 8.3 MHz, derived from its 120 ns read access time (tACC). This allows direct interfacing with microprocessors such as the Intel 80286 or Motorola 68020 without WAIT-state insertion, ensuring deterministic timing in real-time control applications. The AT27C4096-12VI maintains this performance across its full industrial temperature range.
Can the AT27C4096-12VI be reprogrammed after initial programming?
No, the AT27C4096-12VI is a one-time programmable (OTP) EPROM. Once programmed, its memory cells are permanently altered using high-voltage Fowler-Nordheim injection, and no erase mechanism exists. The AT27C4096-12VI is intended for final firmware images or calibration data that must remain immutable throughout the product's lifetime - it cannot be erased or rewritten in-system or via UV exposure.
What decoupling capacitors are required for stable operation of the AT27C4096-12VI?
The AT27C4096-12VI requires a 0.1 µF ceramic capacitor placed between VCC and GND, mounted as close as possible to the device's pins to suppress high-frequency transients during CE transitions. For boards with multiple EPROMs, a 4.7 µF bulk electrolytic capacitor should also be placed near the power entry point. These values are specified in the AT27C4096-12VI datasheet to ensure stable VCC regulation and prevent non-conformance due to supply bounce.
Does the AT27C4096-12VI support 3.3V logic interfaces?
No, the AT27C4096-12VI is strictly a 5V device: its inputs require VIH ≥2.0 V and VIL ≤0.8 V, and outputs drive to VOH ≥2.4 V and VOL ≤0.4 V under 2.1 mA load - all referenced to a 5V ±10% supply. It is not 3.3V-tolerant. Interfacing with 3.3V microcontrollers requires level-shifting circuitry or buffer ICs; the AT27C4096-12VI itself cannot operate from or interface directly with 3.3V logic rails.
How is the Integrated Product Identification Code accessed on the AT27C4096-12VI?
The AT27C4096-12VI's identification code is accessed by setting A9 to VH (11.5–12.5 V) while holding A1–A17 low, then toggling A0: A0 = VIL selects the Manufacturer ID (001Eh), and A0 = VIH selects the Device Code (00F4h). This mode requires VPP = VCC and CE/OE = VIL. The AT27C4096-12VI uses this feature to enable automatic algorithm selection in industry-standard programmers, eliminating manual part selection errors.
AT27C4096-12VI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 40-TFSOP (0.488", 12.40mm Width)
- Packaging:
- Tray
- 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:
- 120 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-VSOP
AT27C4096-12VI FAQ
1.How can I place an order for AT27C4096-12VI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C4096-12VI 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 AT27C4096-12VI reliable?
The price and inventory of AT27C4096-12VI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C4096-12VI is usually 5 days.
3.What payment methods are accepted for AT27C4096-12VI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C4096-12VI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C4096-12VI?
AT27C4096-12VI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C4096-12VI 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 AT27C4096-12VI?
For technical support, including AT27C4096-12VI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C4096-12VI requirements.
6.How does Aetrix verify that AT27C4096-12VI is sourced from the original manufacturer or authorized distributors?
All AT27C4096-12VI 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 AT27C4096-12VI meets industry standards.
7.What is the process for return or replacement of AT27C4096-12VI?
All AT27C4096-12VI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C4096-12VI, 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 AT27C4096-12VI part is unused and in its original packaging.
Return procedure for AT27C4096-12VI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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