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Microchip Technology AT27C4096-55PU
- Part No.:
- AT27C4096-55PU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 40-DIP (0.600", 15.24mm)
- Datasheet:
-
AT27C4096-55PU.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 40DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,863
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Product details
Overview
AT27C4096-55PU from Atmel is a 4-Mbit (256K × 16) one-time programmable EPROM optimized for high-speed read access in 16-/32-bit microprocessor systems. It delivers 55 ns address-to-output delay, operates on single 5V ±10% supply, and consumes ≤100 µA standby current. Its dual-line control (CE/OE), CMOS/TTL compatibility, and industrial temperature range (-40°C to +85°C) make it suitable for firmware storage in embedded controllers and legacy industrial controllers.
For engineers reviewing the AT27C4096-55PU datasheet, AT27C4096-55PU pinout, AT27C4096-55PU application, or AT27C4096-55PU equivalent, key selection criteria include verified 55 ns read timing, PDIP-40 package compatibility, OTP reliability for unmodified firmware, and rapid 50 µs/word programming with integrated identification code support.
Technical Context
The AT27C4096-55PU implements a parallel x16 memory architecture with two independent enable controls (CE and OE) to prevent bus contention during high-speed read cycles. Its internal organization supports full 256K-word addressing via A0–A17, with O0–O15 bidirectional data outputs and dedicated VPP pin for 12.0 V ±0.5 V programming voltage.
It uses high-reliability CMOS process with 2,000 V ESD protection and 200 mA latchup immunity. Programming employs a rapid algorithm requiring only 50 µs CE pulses per word, verified in-loop up to 10 times per location, and includes electronic product identification (manufacturer code 001Eh, device code 00F4h) accessed via A9/VH and A0 toggling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory capacity | 4,194,304 bits (256K × 16) - supports full 16-bit data bus interface without byte-lane splitting |
| Read access time | 55 ns max - eliminates WAIT states in 5 MHz microprocessor systems |
| Supply voltage | 5 V ±10% - compatible with standard TTL/CMOS logic rails; no auxiliary supplies required |
| Standby current | 100 µA max - enables low-power retention in always-on industrial control modules |
| Active current | 40 mA max at 5 MHz - defines thermal budget for dense EPROM arrays on PCBs |
| Programming voltage | VPP = 12.0 V ±0.5 V - requires external high-voltage source; not derived from VCC |
| Operating temperature | -40°C to +85°C - qualified for industrial-grade embedded applications without derating |
Pinout & Package
AT27C4096-55PU is supplied in a 40-lead plastic dual-inline package (PDIP), 0.600" wide, JEDEC MS-011 compliant. Both GND pins (pins 12 and 27) must be connected to system ground for stable operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address inputs | 18-bit address bus supporting full 256K-word decoding; A0 least significant |
| O0–O15 | Data outputs | 16-bit bidirectional data bus; outputs driven only when CE=VIL and OE=VIL |
| CE | Chip enable | Active-low global enable; controls power state transition between active and standby |
| OE | Output enable | Active-low output gate; allows bus sharing without tristate conflicts |
| VPP | Programming voltage | 12.0 V input during programming only; must be disconnected or held at 5 V during read mode |
| VCC | Power supply | 5 V ±10% main supply; powers logic and memory array; must be applied before/with VPP |
| GND (pins 12, 27) | Ground reference | Dual ground connections reduce noise coupling and improve signal integrity in high-speed reads |
| NC (pins 1, 20, 21) | 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. conventional EPROMs |
| Integrated product ID code | Manufacturer ID 001Eh + Device ID 00F4h - enables automatic algorithm selection in production programmers |
| Two-line control (CE/OE) | Independent chip and output enables - eliminates bus contention in multi-device memory maps |
| High-reliability CMOS process | 2,000 V HBM ESD rating and 200 mA latchup immunity - ensures robustness in factory handling and field operation |
| Green (Pb/halide-free) packaging | RoHS-compliant matte tin lead finish - meets industrial environmental compliance requirements without performance trade-offs |
Applications
| Industrial PLC Firmware Storage | Legacy Medical Device Boot Code |
|---|---|
Use Scenario: Storing immutable boot firmware and configuration tables in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile program memory providing deterministic 55 ns read latency to ensure real-time scan cycle execution. Use Value: Eliminates WAIT states in 5 MHz Z80/80C186-based control CPUs, maintaining sub-100 µs I/O response guarantees. | Use Scenario: Holding certified diagnostic firmware and calibration constants in Class II medical instruments with long lifecycle requirements. IC Role / Device Role / Timing Role: OTP EPROM ensuring firmware integrity against accidental overwrite or corruption during service. Use Value: 2,000 V ESD protection and -40°C to +85°C operation support reliable field deployment without battery-backed SRAM complexity. |
| Military Communications Baseband Memory | Avionics Display Controller Code |
Use Scenario: Storing fixed signal processing algorithms and protocol stacks in ruggedized HF/VHF radio transceivers operating in harsh electromagnetic environments. IC Role / Device Role / Timing Role: High-density (256K × 16) read-only memory interfaced directly to 16-bit DSP buses. Use Value: Dual GND pins and 200 mA latchup immunity mitigate noise-induced resets during RF transmission bursts. | Use Scenario: Hosting display initialization routines and font bitmaps in cockpit multifunction displays where firmware updates are prohibited post-certification. IC Role / Device Role / Timing Role: One-time programmable memory providing tamper-resistant, revision-controlled boot code. Use Value: Integrated product ID code (001Eh/00F4h) enables automated verification during avionics depot rework and traceability audits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C4096-55JU | Same die, PLCC-44 package instead of PDIP-40; identical timing, voltage, and programming specs | Requires surface-mount assembly and different PCB footprint; better thermal dissipation in dense layouts | Select when board space constraints favor compact PLCC or when reflow soldering is preferred over through-hole mounting |
| AT27C2048-55PU | 2-Mbit (128K × 16) capacity; same 55 ns access, 5 V supply, and PDIP-40 package; lacks integrated ID code | Half memory density; insufficient for full 4-Mbit firmware images but adequate for smaller bootloaders | Select only if application firmware fits within 2 Mbit and cost reduction outweighs future scalability needs |
Compared with AT27C4096-55JU, the AT27C4096-55PU offers through-hole manufacturability and legacy board compatibility; versus AT27C2048-55PU, it provides double capacity and integrated ID verification-critical for production programming traceability and firmware version control.
Availability
AT27C4096-55PU is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy medical device boot code, military communications baseband memory, and avionics display controller code requiring stable component supply across extended product lifecycles.
Supply support for AT27C4096-55PU 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 nonvolatile memory and microcontroller solutions for industrial, automotive, and communications markets before its 2016 acquisition.
The AT27C4096 belongs to Atmel's OTP EPROM product line, engineered specifically for firmware storage in systems where code immutability, deterministic read timing, and long-term data retention (>10 years) are mandatory design requirements.
FAQ
What is the maximum read access time specified for the AT27C4096-55PU?
The AT27C4096-55PU has a maximum read access time of 55 ns under industrial temperature conditions (-40°C to +85°C) and 5 V ±10% supply. This value is measured as tACC (address-to-output delay) with both CE and OE asserted low, and guarantees no WAIT states are needed for 5 MHz microprocessor interfaces. The -55 suffix in AT27C4096-55PU explicitly denotes this speed grade.
Can the AT27C4096-55PU be used in place of older Atmel EPROMs like the AT27C2048?
Yes, the AT27C4096-55PU is a direct upgrade path from AT27C2048, AT27C1024, and AT27C516 EPROMs per Atmel documentation. It maintains pin compatibility in PDIP-40 format, same 5 V operation, and identical CE/OE control logic. However, AT27C4096-55PU doubles capacity to 4 Mbit and adds integrated product ID code-features not present in earlier variants.
What programming voltage and sequence does the AT27C4096-55PU require?
The AT27C4096-55PU requires VPP = 12.0 V ±0.5 V applied to pin 1 during programming, while VCC remains at 6.5 V ±0.25 V. Programming uses 50 µs CE pulses per word, followed by verify cycles. VCC must be applied simultaneously with or before VPP and removed simultaneously with or after VPP. A 0.1 µF capacitor is mandatory between VPP and GND to suppress transients.
Does the AT27C4096-55PU support both CMOS and TTL logic families?
Yes, the AT27C4096-55PU features CMOS- and TTL-compatible inputs and outputs. Input thresholds meet both standards: VIL ≤ 0.8 V and VIH ≥ 2.0 V; output drive meets TTL loads (IOL = 2.1 mA, VOL ≤ 0.4 V) and CMOS levels (VOH ≥ 2.4 V at IOH = −400 µA). This allows seamless integration into mixed-logic systems without level-shifting circuitry.
Is the AT27C4096-55PU RoHS compliant?
Yes, the AT27C4096-55PU uses green (Pb/halide-free) packaging with matte tin lead finish, meeting RoHS Directive 2011/65/EU requirements. This applies to both the PDIP-40 package variant and the PLCC-44 alternative (AT27C4096-55JU). No exemptions or declarations of non-compliance are associated with this ordering code.
AT27C4096-55PU 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:
- 55 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
AT27C4096-55PU FAQ
1.How can I place an order for AT27C4096-55PU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C4096-55PU 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 AT27C4096-55PU reliable?
The price and inventory of AT27C4096-55PU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C4096-55PU is usually 5 days.
3.What payment methods are accepted for AT27C4096-55PU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C4096-55PU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C4096-55PU?
AT27C4096-55PU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C4096-55PU 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 AT27C4096-55PU?
For technical support, including AT27C4096-55PU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C4096-55PU requirements.
6.How does Aetrix verify that AT27C4096-55PU is sourced from the original manufacturer or authorized distributors?
All AT27C4096-55PU 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 AT27C4096-55PU meets industry standards.
7.What is the process for return or replacement of AT27C4096-55PU?
All AT27C4096-55PU units undergo pre-shipment inspection (PSI). If there is an issue with AT27C4096-55PU, 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 AT27C4096-55PU part is unused and in its original packaging.
Return procedure for AT27C4096-55PU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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