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Microchip Technology AT27C4096-90PU
- Part No.:
- AT27C4096-90PU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 40-DIP (0.600", 15.24mm)
- Datasheet:
-
AT27C4096-90PU.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 40DIP
- Quantity:
- Payment:
- Shipping:
Inventory:613
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Product details
Overview
AT27C4096-90PU from Atmel is a 4-Mbit (256K × 16) one-time programmable EPROM optimized for 16-/32-bit microprocessor systems, featuring 90ns read access time, 5V ±10% supply operation, and industrial temperature range (–40°C to +85°C). It supports CMOS/TTL-compatible I/O, two-line control (CE/OE), and rapid 50µs/word programming.
For engineers reviewing the AT27C4096-90PU datasheet, AT27C4096-90PU pinout, AT27C4096-90PU application, or AT27C4096-90PU equivalent, key selection criteria include x16 bus interface compatibility, OTP firmware storage reliability, low standby current (<100µA), and JEDEC-standard 40-lead PDIP packaging with verified VPP=12V programming voltage support.
Technical Context
The AT27C4096-90PU implements a parallel-addressed OTP memory architecture with dual active-low enable controls (CE and OE) to prevent bus contention in high-speed systems. Its x16 organization enables full-word access per cycle, eliminating wait states in 16-bit data paths.
It uses high-reliability CMOS technology with 2,000V ESD protection and 200mA latchup immunity, and integrates an electronic product identification code accessible via A9/VH and A0 toggling-enabling automated programming equipment recognition of manufacturer (001Eh) and device code (00F4h).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4,194,304 bits (256K × 16); supports full 16-bit parallel data bus without byte-lane splitting |
| Read access time | 90 ns max; ensures compatibility with 10 MHz system clocks without wait-state insertion |
| VCC supply | 5 V ±10%; operates directly from standard logic rail without regulation |
| Standby current | 100 µA max; enables low-power retention in battery-backed or intermittent-read systems |
| Active current | 40 mA max at 5 MHz; defines thermal budget for dense EPROM arrays |
| Programming voltage | VPP = 12.0 V ±0.5 V; requires dedicated high-voltage supply during programming only |
| Operating temperature | –40°C to +85°C case; validated for industrial control and embedded instrumentation environments |
Pinout & Package
AT27C4096-90PU is supplied in a 40-lead plastic dual-inline package (PDIP), 0.600" wide, conforming to JEDEC MS-011 AC. Both GND pins (pins 12 and 27) must be connected for stable operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address inputs | 18-bit address bus supporting full 256K-word addressing; A0–A17 mapped directly to memory location |
| O0–O15 | Data outputs | 16-bit bidirectional output bus; outputs driven only when CE=low and OE=low |
| CE | Chip enable | Active-low global enable; disables outputs and reduces ICC to standby level when high |
| OE | Output enable | Active-low output gate; allows shared bus operation without disabling chip power state |
| VCC | Power supply | +5 V supply pin; must be applied simultaneously with or before VPP during programming |
| VPP | Programming voltage | +12 V programming supply; isolated from VCC during read mode; requires 0.1 µF ceramic capacitor to ground |
| GND (pins 12, 27) | Ground reference | Dual ground connections reduce noise coupling and ensure stable read/write margins |
| NC (pins 18, 20, 39) | No connect | Unbonded pins; must remain unconnected to avoid parasitic coupling or latchup risk |
Key Features
| Feature | Design Value |
|---|---|
| Rapid programming algorithm | 50 µs/word typical; reduces firmware burn time by >90% vs. legacy EPROMs, enabling high-throughput production programming |
| Integrated product ID code | Manufacturer ID (001Eh) and device code (00F4h) readable via A9/VH and A0 toggle; eliminates manual part verification in automated handlers |
| Two-line control (CE/OE) | Independent chip and output enables allow seamless integration into multiplexed bus architectures without external gating logic |
| CMOS/TTL compatibility | Input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V) and output drive (VOL ≤ 0.4 V, VOH ≥ 2.4 V) meet both logic families-no level-shifting required |
| Industrial reliability | 2,000 V HBM ESD rating and 200 mA latchup immunity ensure robustness in factory-floor and field-deployed systems |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded Instrumentation |
|---|---|
Use Scenario: Storing fixed control logic and calibration tables in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile firmware storage element providing deterministic 90ns read latency to real-time CPU fetch cycles. Use Value: Eliminates boot-time mass storage delays; retains program integrity across power cycles and vibration-prone enclosures. | Use Scenario: Replacing obsolete EPROMs in medical analyzers and test equipment requiring long-term firmware stability and zero-field updates. IC Role / Device Role / Timing Role: OTP memory serving as immutable configuration store for analog front-end calibration coefficients and safety-critical boot sequences. Use Value: Guarantees firmware immutability post-programming-prevents accidental corruption during field service or EMI events. |
| Military Avionics Boot ROM | Telecom Line Card Configuration |
Use Scenario: Holding boot firmware for mission-critical flight control processors where radiation tolerance and data retention over 20+ years are mandatory. IC Role / Device Role / Timing Role: Primary boot ROM accessed during cold-start initialization; x16 interface matches processor data bus width. Use Value: Industrial-grade temperature range and 200mA latchup immunity ensure operational continuity under extreme thermal cycling and transient load conditions. | Use Scenario: Storing hardware-specific configuration data (e.g., port mapping, PHY settings) on telecom line cards operating in central office environments. IC Role / Device Role / Timing Role: Static configuration memory accessed once at power-up; CE/OE control enables sharing with other peripherals on common address/data bus. Use Value: Low 100µA standby current minimizes quiescent power draw across hundreds of line cards in densely packed chassis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C2048-90PU | 2-Mbit (128K × 16), same 90ns speed, identical 40-pin PDIP package and pinout | Half capacity; suitable where firmware footprint fits within 2 Mbit and board layout reuse is critical | Select when existing PCB layout accommodates AT27C2048 but firmware growth necessitates upgrade path to AT27C4096-90PU |
| AM27C4096-90DC | Same 4-Mbit x16 OTP EPROM, 90ns access, but in 44-pin PLCC package with different pin assignment and VPP routing | Requires PCB redesign due to PLCC footprint and distinct VPP pin location (pin 1 vs. pin 18 on PDIP) | Choose only if PLCC mounting is mandated by mechanical constraints or thermal management requirements |
Compared with AT27C2048-90PU, AT27C4096-90PU doubles storage while maintaining identical timing and package compatibility-enabling firmware scalability without layout change. Versus AM27C4096-90DC, it offers direct PDIP drop-in replacement capability but lacks PLCC's thermal dissipation advantage in high-density arrays.
Availability
AT27C4096-90PU is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded instrumentation, military avionics boot ROM, and telecom line card configuration requiring stable component supply and long-term obsolescence management.
Supply support for AT27C4096-90PU 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 was a U.S.-based semiconductor company specializing in microcontrollers, nonvolatile memory, and security ICs, acquired by Microchip Technology in 2016.
The AT27C series delivers high-reliability OTP EPROMs designed for firmware storage in industrial, military, and telecom systems where data integrity, long-term retention, and deterministic read timing are essential.
FAQ
What is the maximum programming voltage required for AT27C4096-90PU?
The AT27C4096-90PU requires VPP = 12.0 V ± 0.5 V during programming, as specified in its DC programming characteristics table. This voltage must be applied only during programming cycles-not during read operation-and must be synchronized with VCC application. The AT27C4096-90PU datasheet mandates a 0.1 µF ceramic capacitor between VPP and GND to suppress transients. Exceeding 12.5 V risks permanent damage per absolute maximum ratings.
Does AT27C4096-90PU support in-system programming?
No, AT27C4096-90PU does not support in-system programming. It is a one-time programmable EPROM requiring external high-voltage (12 V) programming equipment with dedicated VPP supply and precise timing control (50 µs CE pulse width). Programming must occur off-board using certified EPROM programmers; no internal circuitry enables reprogramming after initial burn, and no serial or JTAG interface is present on the AT27C4096-90PU.
What is the meaning of the "-90" suffix in AT27C4096-90PU?
The "-90" in AT27C4096-90PU denotes the maximum read access time specification: 90 ns. This value appears in tACC, tCE, and tOE timing parameters under industrial temperature conditions. It distinguishes this speed grade from the faster -55 variant (55 ns) and confirms guaranteed performance up to 90 ns across –40°C to +85°C. The "PU" suffix indicates 40-lead PDIP packaging with matte tin lead finish.
Can AT27C4096-90PU operate from a 3.3 V supply?
No, AT27C4096-90PU cannot operate from a 3.3 V supply. Its DC operating conditions specify VCC = 5 V ±10%, and input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V) and output drive levels (VOL ≤ 0.4 V, VOH ≥ 2.4 V) are defined only for 5 V operation. Applying 3.3 V violates the minimum VIH requirement and will result in unreliable read behavior or complete failure to recognize control signals. The AT27C4096-90PU requires strict adherence to 5 V supply rails.
How is the integrated product identification code accessed on AT27C4096-90PU?
The integrated product identification code on AT27C4096-90PU is accessed by applying VH = 12.0 V ± 0.5 V to pin A9 while holding A1–A17 low, then toggling A0 between low (to read manufacturer ID 001Eh) and high (to read device code 00F4h). Outputs O0–O15 reflect the 16-bit hex code. This mode requires VCC = 6.5 V ± 0.25 V and VPP = 13.0 V ± 0.25 V, and is used exclusively by automated programming equipment-not during normal read operation of the AT27C4096-90PU.
AT27C4096-90PU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 40-DIP (0.600", 15.24mm)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- 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
AT27C4096-90PU FAQ
1.How can I place an order for AT27C4096-90PU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C4096-90PU 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 AT27C4096-90PU reliable?
The price and inventory of AT27C4096-90PU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C4096-90PU is usually 5 days.
3.What payment methods are accepted for AT27C4096-90PU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C4096-90PU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C4096-90PU?
AT27C4096-90PU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C4096-90PU 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 AT27C4096-90PU?
For technical support, including AT27C4096-90PU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C4096-90PU requirements.
6.How does Aetrix verify that AT27C4096-90PU is sourced from the original manufacturer or authorized distributors?
All AT27C4096-90PU 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 AT27C4096-90PU meets industry standards.
7.What is the process for return or replacement of AT27C4096-90PU?
All AT27C4096-90PU units undergo pre-shipment inspection (PSI). If there is an issue with AT27C4096-90PU, 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 AT27C4096-90PU part is unused and in its original packaging.
Return procedure for AT27C4096-90PU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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