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Microchip Technology AT27C040-90JC
- Part No.:
- AT27C040-90JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT27C040-90JC.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,156
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Product details
Overview
AT27C040-90JC from Atmel is a 4-Mbit (512K × 8) one-time programmable EPROM designed for nonvolatile program storage in microprocessor systems. It operates from a single 5V ±10% supply, delivers 90 ns read access time, draws ≤100 µA standby current, and supports commercial temperature range (0°C to 70°C) in a 32-lead PLCC package. It serves as firmware storage in legacy industrial controllers and embedded boot memory.
For engineers reviewing the AT27C040-90JC datasheet, AT27C040-90JC pinout, AT27C040-90JC application, or AT27C040-90JC equivalent, key selection criteria include verified 90 ns tACC timing, PLCC-32 mechanical compatibility, VPP = 12.0 V programming voltage, CMOS/TTL I/O compatibility, and Rapid™ 100 µs/byte programming algorithm compliance.
Technical Context
The AT27C040-90JC implements a two-line control architecture with CE and OE inputs to manage bus contention during high-speed read cycles. Its internal address decoder accepts A0–A18 (19-bit), enabling full 512K-byte addressing without external latching.
Programming requires VPP = 12.0 ± 0.5 V applied to Pin 1 while VCC is raised to 6.5 V; the Rapid™ algorithm uses 100 µs CE pulses per byte with up to 10 retries per failed location. Product identification is accessed via A9 = VH and A0 toggling to output Manufacturer ID (0x1E) and Device Code (0x0B).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4,194,304 bits (512K × 8); supports full 19-bit address space for boot code or firmware image storage |
| Read Access Time (tACC) | 90 ns max; enables direct interface with 80386/80486-class CPUs without wait states |
| Supply Voltage | 5 V ±10%; eliminates need for dedicated programming power rail during normal operation |
| Standby Current (ISB1) | 100 µA max (CMOS CE); ensures low-power retention in battery-backed systems |
| Programming Voltage (VPP) | 12.0 ± 0.5 V on Pin 1; requires external high-voltage source during initial programming only |
| Input Compatibility | CMOS and TTL logic levels; simplifies integration with mixed-logic legacy designs |
| ESD Protection | 2000 V HBM; meets industrial handling requirements without additional protection circuitry |
Pinout & Package
AT27C040-90JC is packaged in a 32-lead Plastic Leaded Chip Carrier (PLCC), JEDEC MS-016 compliant, with 1.27 mm pitch, 12.4 mm × 14.9 mm body, and pin 1 identifier notch at top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit parallel address bus; fully decodes 512K locations without external demultiplexing |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus; outputs valid within 90 ns of CE/OE assertion |
| CE | Chip Enable | Active-low global enable; controls device power state and output driver activation |
| OE | Output Enable | Active-low output gate; allows shared bus operation with other peripherals |
| VPP | Programming Voltage | 12 V input required only during programming; must be applied after VCC and removed before VCC |
| VCC | Power Supply | +5 V main supply; powers logic and output drivers during read and programming modes |
| GND | Ground Reference | Signal and power return; requires local 0.1 µF ceramic decoupling per device |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time; reduces production burn-in cycle duration by >90% vs. standard EPROMs |
| Integrated Product ID Code | Manufacturer ID (0x1E) and Device Code (0x0B) accessible via A9/VH and A0 toggle; enables automated programmer validation |
| Two-Line Control (CE/OE) | Eliminates bus contention in multi-peripheral systems; supports clean read/write handshaking without external logic |
| High Reliability CMOS | 200 mA latchup immunity and 2000 V ESD rating; sustains operation in electrically noisy industrial environments |
| JEDEC Standard Packages | PLCC-32 footprint matches industry-standard sockets; enables drop-in replacement across Atmel's 4-Mbit EPROM family |
Applications
| Industrial PLC Firmware Storage | Legacy PC BIOS Memory |
|---|---|
Use Scenario: Stores ladder logic firmware in programmable logic controllers operating in factory-floor environments with wide temperature swings and EMI. IC Role / Device Role / Timing Role: Nonvolatile boot memory providing deterministic 90 ns read access to instruction fetch pipeline. Use Value: Eliminates need for external wait-state generators, reducing PCB complexity and BOM count in cost-sensitive automation hardware. |
Use Scenario: Holds BIOS initialization code in early x86-based workstations and servers where field-upgradability is not required. IC Role / Device Role / Timing Role: Static firmware repository mapped to CPU's upper memory region (e.g., F0000h–FFFFFh). Use Value: Single 5 V supply simplifies power design; PLCC-32 socket compatibility enables easy reprogramming during manufacturing test. |
| Military Avionics Boot ROM | Medical Equipment Configuration Memory |
Use Scenario: Stores immutable boot loader and safety-critical startup routines in airborne mission computers certified to DO-254 Level A. IC Role / Device Role / Timing Role: OTP memory ensuring runtime integrity; programmed once during final assembly and sealed against tampering. Use Value: 2000 V ESD protection and -40°C to +85°C industrial grade variants support ruggedized chassis mounting without shielding. |
Use Scenario: Retains calibration constants and device-specific configuration parameters in diagnostic imaging systems requiring long-term data retention. IC Role / Device Role / Timing Role: Read-only parameter store accessed during power-on self-test (POST) sequence. Use Value: 100 µA max standby current extends battery backup life in portable ultrasound units; no refresh circuitry needed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C040-90DC | 90 ns tACC, same 512K×8 organization, but uses AMD's proprietary programming algorithm and lacks integrated product ID code | Requires AMD-specific programmers; no automated ID verification during production programming | Select when using legacy AMD toolchains and socket-compatible PLCC-32 layout already exists |
| MX27C4001-90PC | Same 90 ns speed grade and 4-Mbit density, but packaged in PDIP-32 instead of PLCC-32; VPP = 12.5 V | Requires PCB footprint change; higher profile may conflict with adjacent components in compact designs | Choose for through-hole assembly or when existing DIP sockets must be reused |
Compared with AM27C040-90DC and MX27C4001-90PC, the AT27C040-90JC offers unique Rapid™ programming and built-in ID code verification-critical for high-yield manufacturing-but requires PLCC-specific socketing and 12.0 V VPP sourcing.
Availability
AT27C040-90JC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy PC BIOS replacement, military avionics boot ROM, and medical equipment configuration memory requiring stable component supply over extended production lifecycles.
Supply support for AT27C040-90JC 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, specialized in high-reliability nonvolatile memory and microcontroller solutions for industrial, automotive, and aerospace markets.
The AT27C040 belongs to Atmel's OTP EPROM product line, engineered for cost-effective, radiation-tolerant firmware storage in systems where field updates are unnecessary and long-term data retention is mandatory.
FAQ
What is the maximum allowable VPP voltage for programming the AT27C040-90JC?
The AT27C040-90JC requires VPP = 12.0 ± 0.5 V applied to Pin 1 during programming. Voltages exceeding 12.5 V risk permanent damage, while values below 11.5 V may cause incomplete programming or verification failure. The AT27C040-90JC datasheet specifies VID (A9 identification voltage) at 11.5–12.5 V, confirming this tolerance band applies to all VPP-dependent operations including Rapid™ programming and product ID readback.
Does the AT27C040-90JC support concurrent read and write operations?
No, the AT27C040-90JC is a one-time programmable EPROM and does not support concurrent read and write. It operates exclusively in read mode (CE/OE = L/L), standby (CE = H), or programming mode (CE pulse with VPP = 12 V). During programming, the device enters Rapid™ mode where CE pulses write data and subsequent OE assertions verify contents - these are sequential, not simultaneous, operations. The AT27C040-90JC has no internal write-enable register or page buffer to enable overlap.
Can the AT27C040-90JC be used in place of the AT27C040-70JC without hardware changes?
Yes, the AT27C040-90JC is pin- and function-compatible with the AT27C040-70JC, differing only in guaranteed maximum read access time (90 ns vs. 70 ns) and corresponding AC timing parameters. Both share identical DC characteristics, pinout, package (PLCC-32), VPP requirements, and programming algorithms. The AT27C040-90JC may be substituted where system timing budgets allow 90 ns latency, but not in designs relying on the tighter 70 ns tACC margin.
What decoupling capacitance is required for stable operation of the AT27C040-90JC?
The AT27C040-90JC requires a minimum 0.1 µF high-frequency ceramic capacitor between VCC and GND, placed as close as possible to Pins 16 and 32. For systems with multiple EPROMs or high-noise environments, a 4.7 µF bulk electrolytic capacitor must also be added near the power entry point. These values are specified in the AT27C040-90JC switching considerations section to suppress transients caused by CE-driven state transitions and ensure VCC remains within 5 V ±10% during active read cycles.
How is the manufacturer and device identification code accessed on the AT27C040-90JC?
The AT27C040-90JC provides an Integrated Product Identification Code readable in normal read mode: hold A1–A18 low, apply VH = 12.0 ± 0.5 V to A9, then toggle A0 between VIL and VIH to select Manufacturer ID (0x1E) or Device Code (0x0B) on O0–O7. This feature is electrically verified per the AT27C040-90JC datasheet and enables automatic detection by industry-standard programmers - no special command sequences or VPP cycling is needed beyond the specified voltage conditions.
AT27C040-90JC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-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:
- 512K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- -
- Access Time:
- 90 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT27C040-90JC FAQ
1.How can I place an order for AT27C040-90JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C040-90JC 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 AT27C040-90JC reliable?
The price and inventory of AT27C040-90JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C040-90JC is usually 5 days.
3.What payment methods are accepted for AT27C040-90JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C040-90JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C040-90JC?
AT27C040-90JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C040-90JC 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 AT27C040-90JC?
For technical support, including AT27C040-90JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C040-90JC requirements.
6.How does Aetrix verify that AT27C040-90JC is sourced from the original manufacturer or authorized distributors?
All AT27C040-90JC 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 AT27C040-90JC meets industry standards.
7.What is the process for return or replacement of AT27C040-90JC?
All AT27C040-90JC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C040-90JC, 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 AT27C040-90JC part is unused and in its original packaging.
Return procedure for AT27C040-90JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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