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Microchip Technology AT27C4096-70JC
- Part No.:
- AT27C4096-70JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
AT27C4096-70JC.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,864
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Product details
Overview
AT27C4096-70JC 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 JEDEC-standard 44-lead PLCC packaging. It supports rapid programming at 50 µs/word and delivers low active current (40 mA max at 5 MHz) with CMOS/TTL-compatible I/O.
For engineers reviewing the AT27C4096-70JC datasheet, AT27C4096-70JC pinout, AT27C4096-70JC application, or AT27C4096-70JC equivalent, key selection considerations include its 70 ns read timing, dual-line control (CE/OE), OTP reliability for firmware storage, and compatibility with legacy 512K–2M-bit EPROM upgrades in industrial and commercial temperature ranges.
Technical Context
The AT27C4096-70JC implements a 256K-word × 16-bit OTP memory array with two-line enable architecture (CE and OE) to prevent bus contention in high-speed systems. Its address range spans A0–A17, supporting full 4-Mbit addressing without external decoding.
It operates exclusively in 5V read mode but requires elevated VPP = 12.0 ± 0.5V during programming, with integrated product identification code accessible via A9 and A0 toggling. Standby current is specified at ≤100 µA (CMOS) with 2,000V ESD protection and 200 mA latchup immunity.
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-wide splitting |
| Read Access Time | 70 ns - eliminates WAIT states in 5 MHz microprocessor systems |
| Supply Voltage | 5V ±10% - compatible with standard TTL/CMOS logic rails; no auxiliary voltage required for read mode |
| Active Current | 40 mA max at 5 MHz - enables stable operation in power-constrained embedded controllers |
| Standby Current | 100 µA max (CMOS) - suitable for low-power hold modes in battery-backed systems |
| Programming Speed | 50 µs/word typical - reduces firmware update time in production programming stations |
| Operating Temperature | 0°C to +70°C - certified for commercial-grade industrial control and instrumentation |
Pinout & Package
AT27C4096-70JC is supplied in a 44-lead plastic J-leaded chip carrier (PLCC), JEDEC MS-018 AC compliant, with 1.27 mm lead pitch and body size 16.7 mm × 16.7 mm. Both GND pins must be connected for reliable operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 256K-word addressing (18-bit address bus); A0–A17 fully decoded internally |
| O0–O15 | Data Outputs | 16-bit parallel output bus; TTL/CMOS-compatible drive strength (2.1 mA sink, -400 µA source) |
| CE | Chip Enable | Primary device select; must be low for read or program operations; controls standby entry |
| OE | Output Enable | Secondary output gate; allows bus sharing when CE is active but OE is high |
| VPP | Programming Voltage | 12.0 ± 0.5V input during programming only; must be applied after VCC and removed before VCC |
| VCC | Power Supply | 5V ±10% main supply; powers all logic and memory array in read mode |
| GND | Ground | Two dedicated ground pins required; both must be connected to minimize noise and ensure ESD robustness |
| NC | No Connect | Pins 7, 22, 32, and 44 are unconnected; must remain floating per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 50 µs/word typical programming time with built-in verify-reprogram loop up to 10 pulses per word |
| Integrated Product Identification Code | Manufacturer ID (001Eh) and Device Code (00F4h) readable via A9/VH and A0 toggle for automated programmer recognition |
| JEDEC Standard Packages | 44-lead PLCC (44J) footprint ensures drop-in compatibility with existing EPROM sockets and test fixtures |
| High Reliability CMOS Process | 2,000V HBM ESD rating and 200 mA latchup immunity support rugged industrial board-level handling |
| Direct Upgrade Path | Pin- and function-compatible replacement for AT27C516 (512K), AT27C1024 (1M), and AT27C2048 (2M) EPROMs |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded System Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic and I/O configuration in programmable logic controllers operating in factory environments with 0°C to 70°C ambient. IC Role / Device Role / Timing Role: Non-volatile boot memory providing deterministic 70 ns read access to instruction fetch cycles of 16-bit microcontrollers. Use Value: Eliminates WAIT states in 5 MHz CPU buses, ensuring real-time scan cycle consistency without external wait-state generators. |
Use Scenario: Replacing obsolete 1M-bit EPROMs in medical diagnostic equipment where firmware updates occur infrequently but require long-term data retention. IC Role / Device Role / Timing Role: OTP firmware repository accessed during cold boot; CE/OE dual-control prevents bus conflicts during reset sequencing. Use Value: Enables direct upgrade from AT27C1024 without PCB redesign, leveraging identical PLCC-44 footprint and 5V interface. |
| Automotive Instrument Cluster Memory | Test Equipment Calibration Data Storage |
Use Scenario: Holding calibrated display parameters and vehicle-specific configuration tables in dashboard clusters rated for commercial temperature range. IC Role / Device Role / Timing Role: Read-only memory mapped into microcontroller address space; accessed during startup and periodic self-test routines. Use Value: 100 µA max standby current minimizes quiescent drain on vehicle battery during ignition-off periods. |
Use Scenario: Storing precision calibration coefficients and sensor linearization tables in benchtop oscilloscopes and signal analyzers. IC Role / Device Role / Timing Role: Factory-programmed OTP storage accessed via parallel bus during instrument initialization and measurement setup. Use Value: Integrated product ID code allows automated calibration verification during manufacturing test, reducing manual setup errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C4096-70PC | Same die, 40-lead PDIP package (40P6); 600 mil width; no J-leads | Suitable for through-hole prototyping or legacy socketed designs requiring DIP form factor | Select when board layout uses 40P6 sockets or manual soldering is preferred over surface-mount PLCC reflow |
| AT27C4096-70VI | Same die, 40-lead VSOP package (40V); 10 mm × 14 mm; industrial temp (-40°C to +85°C) | Required for extended temperature operation in outdoor or under-hood applications | Select when ambient exceeds +70°C or system qualification mandates industrial-grade thermal margin |
Compared with AT27C4096-70JC, the -70PC offers through-hole mounting convenience but larger PCB footprint, while the -70VI extends temperature capability at the cost of different package geometry and higher assembly complexity-neither is pin-compatible due to differing lead counts and pitch.
Availability
AT27C4096-70JC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded system boot ROM, and automotive instrument cluster memory requiring stable component supply across multi-year production cycles.
Supply support for AT27C4096-70JC 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 fabless semiconductor company specializing in non-volatile memory, microcontrollers, and secure authentication ICs.
The AT27C4096 belongs to Atmel's OTP EPROM product line, designed specifically for reliable, low-cost firmware storage in cost-sensitive industrial and commercial systems where reprogrammability is unnecessary.
FAQ
What is the maximum read access time specification for AT27C4096-70JC?
The AT27C4096-70JC has a guaranteed maximum read access time of 70 ns under commercial temperature conditions (0°C to +70°C) and 5V ±10% supply. This value is measured from address valid or CE/OE assertion to valid data output, enabling direct interface with 5 MHz microprocessors without WAIT-state insertion. The -70 suffix explicitly denotes this speed grade.
Does AT27C4096-70JC require a programming voltage during normal read operation?
No, AT27C4096-70JC operates solely from a 5V ±10% supply during read mode. VPP (12.0 ± 0.5V) is required only during programming and must be applied after VCC and removed before VCC. In read mode, VPP may be tied to VCC, but doing so increases standby current slightly per datasheet Note 5.
How many ground connections does AT27C4096-70JC require, and why?
AT27C4096-70JC requires two dedicated GND connections (pins 1 and 23 in PLCC pinout), both of which must be connected to system ground. This dual-ground design reduces ground bounce, improves noise immunity during high-speed reads, and ensures compliance with 2,000V ESD protection and 200 mA latchup immunity specifications.
Can AT27C4096-70JC be used as a direct replacement for AT27C2048 in an existing design?
Yes, AT27C4096-70JC is explicitly documented as a direct upgrade path for AT27C2048 (2M-bit EPROM). It shares identical pinout, voltage levels, and control signaling (CE/OE), with only increased memory depth (256K × 16 vs. 128K × 16). No PCB changes are needed beyond verifying PLCC-44 socket compatibility and updating firmware image size.
What is the purpose of the Integrated Product Identification Code in AT27C4096-70JC?
The Integrated Product Identification Code in AT27C4096-70JC provides manufacturer (001Eh) and device (00F4h) identifiers readable via A9 = 12.0V and A0 toggled low/high. This enables automated programming equipment to validate part identity before applying VPP, preventing incorrect algorithm selection and ensuring reliable programming of AT27C4096-70JC in high-volume production.
AT27C4096-70JC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 44-LCC (J-Lead)
- 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:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 44-PLCC (16.6x16.6)
AT27C4096-70JC FAQ
1.How can I place an order for AT27C4096-70JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C4096-70JC 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 AT27C4096-70JC reliable?
The price and inventory of AT27C4096-70JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C4096-70JC is usually 5 days.
3.What payment methods are accepted for AT27C4096-70JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C4096-70JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C4096-70JC?
AT27C4096-70JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C4096-70JC 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 AT27C4096-70JC?
For technical support, including AT27C4096-70JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C4096-70JC requirements.
6.How does Aetrix verify that AT27C4096-70JC is sourced from the original manufacturer or authorized distributors?
All AT27C4096-70JC 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 AT27C4096-70JC meets industry standards.
7.What is the process for return or replacement of AT27C4096-70JC?
All AT27C4096-70JC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C4096-70JC, 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 AT27C4096-70JC part is unused and in its original packaging.
Return procedure for AT27C4096-70JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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