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Microchip Technology AT27C040-15JI
- Part No.:
- AT27C040-15JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT27C040-15JI.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,387
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Product details
Overview
AT27C040-15JI from Atmel is a 4-Mbit (512K × 8) one-time programmable EPROM designed for non-volatile program storage in microprocessor systems. It operates on a single 5V ±10% supply, delivers 150 ns maximum access time, supports industrial temperature range (–40°C to +85°C), and uses JEDEC-standard 32-lead PLCC packaging. It serves as firmware storage in legacy embedded controllers requiring reliable, low-power read-only memory.
For engineers reviewing the AT27C040-15JI datasheet, AT27C040-15JI pinout, AT27C040-15JI application, or AT27C040-15JI equivalent, key selection criteria include verified 150 ns read timing, industrial-grade VPP programming voltage (12.0 V ±0.5 V), CMOS/TTL I/O compatibility, integrated product identification code, and PLCC package mechanical dimensions per JEDEC MS-016 AE.
Technical Context
The AT27C040-15JI implements a two-line control architecture with Chip Enable (CE) and Output Enable (OE) to prevent bus contention during high-speed reads. Its address space spans A0–A18 (19 address lines), supporting full 512K-byte decoding without external logic.
It features Rapid™ programming with 100 µs/byte typical pulse width at VPP = 13.0 V ±0.25 V and VCC = 6.5 V ±0.25 V, plus integrated manufacturer (0x1E) and device (0x0B) identification codes accessible via A9 high-voltage mode and A0 toggling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4,194,304 bits (512K × 8); enables full firmware image storage for 8-bit microcontrollers without banking. |
| Read Access Time | 150 ns max (tACC); eliminates WAIT states on 6–7 MHz Z80, 8051, and 68K-based systems. |
| Supply Voltage | 5V ±10%; compatible with standard TTL/CMOS logic rails and legacy power supplies. |
| Standby Current | 100 µA max (ISB1, CMOS CE); supports low-power hold modes in battery-backed systems. |
| VPP Programming Voltage | 12.0 V ±0.5 V (VID); requires dedicated programming hardware with precision high-voltage regulation. |
| Operating Temperature | –40°C to +85°C; qualified for industrial control panels, motor drives, and telecom line cards. |
| ESD Protection | 2000V HBM; withstands handling in uncontrolled assembly environments without additional protection circuitry. |
Pinout & Package
AT27C040-15JI is supplied in a 32-lead Plastic J-Leaded Chip Carrier (PLCC) per JEDEC MS-016 Variation AE, with 1.27 mm pitch, 12.4 mm × 14.9 mm body, and pin 1 identifier notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus interface; fully decodes 512K-byte space; no address latching required. |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus outputs; TTL/CMOS-compatible drive strength (2.1 mA sink, –400 µA source). |
| CE | Chip Enable | Active-low chip select; controls device activation and power state transition between active/standby. |
| OE | Output Enable | Active-low output gate; enables data bus drivers independently of CE for shared-bus timing control. |
| VPP | Programming Voltage | 12 V input during programming only; must be applied after VCC and removed before VCC per sequencing rules. |
| VCC | Power Supply | +5 V main supply; powers logic and output buffers; requires 0.1 µF ceramic bypass capacitor at pin. |
| GND | Ground Reference | Signal and power return; requires low-inductance connection to minimize noise during rapid programming. |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical pulse width ensures <10-second full-device programming versus legacy EPROMs requiring >1 minute. |
| Integrated Product Identification Code | Manufacturer ID (0x1E) and Device Code (0x0B) enable automatic algorithm selection in universal programmers. |
| Two-Line Control (CE/OE) | Eliminates bus contention in multi-device systems by allowing independent output gating and chip selection timing. |
| High-Reliability CMOS Process | 200 mA latchup immunity prevents destructive current paths during transient overvoltage events on I/O pins. |
| JEDEC-Standard PLCC Packaging | 32J footprint ensures drop-in replacement across Atmel's AT27C040 family and compatible EPROMs in existing PCB layouts. |
Applications
| Industrial PLC Firmware Storage | Legacy Telecom Line Card Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic and I/O mapping tables in programmable logic controllers deployed in factory automation cabinets. IC Role / Device Role / Timing Role: Non-volatile boot memory providing deterministic 150 ns instruction fetch latency to ensure real-time scan cycle consistency. Use Value: Eliminates need for external wait-state generators and supports direct CPU address bus interfacing without glue logic. | Use Scenario: Holding initialization code and protocol stacks for T1/E1 framing ICs in carrier-class digital loop carrier systems. IC Role / Device Role / Timing Role: Read-only firmware repository accessed during cold start and reset recovery sequences. Use Value: Industrial temperature rating ensures stable operation in unventilated central office equipment racks operating at 65°C ambient. |
| Military Avionics Configuration Memory | Medical Imaging System Calibration Data |
Use Scenario: Storing flight-critical configuration parameters and sensor calibration offsets in airborne mission computers. IC Role / Device Role / Timing Role: Tamper-resistant OTP storage preventing unauthorized runtime modification of safety-critical settings. Use Value: 2000V ESD protection reduces risk of field-programmable corruption during maintenance in electrostatic-prone aircraft bays. | Use Scenario: Retaining gamma correction tables and detector gain coefficients in X-ray and MRI subsystems. IC Role / Device Role / Timing Role: Static lookup table provider accessed during system power-up and recalibration routines. Use Value: Low 100 µA standby current minimizes battery drain in portable diagnostic devices during extended idle periods. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C040-15DC | Same 4-Mbit size and 150 ns speed, but uses 32-lead PDIP (32P6) instead of PLCC; higher 1.5 mA TTL-mode standby current. | Preferred where through-hole assembly or socketed prototyping is required; unsuitable for surface-mount industrial PCBs. | Select AM27C040-15DC only when legacy PDIP footprint compatibility is mandatory and board space allows larger package. |
| MX27C4001-15PC | Identical PLCC-32 package and 150 ns timing, but specifies 12 V ±0.3 V VPP and lacks integrated product ID code. | Requires manual algorithm selection in programmers; suitable for cost-sensitive production where ID auto-detection is unnecessary. | Choose MX27C4001-15PC when VPP tolerance margin is sufficient and programming infrastructure does not rely on electronic ID verification. |
Compared with AM27C040-15DC and MX27C4001-15PC, the AT27C040-15JI provides superior ESD robustness (2000V vs. 1500V), lower CMOS standby current (100 µA vs. 150 µA), and guaranteed product ID code support-critical for automated high-volume programming lines.
Availability
AT27C040-15JI is available at Aetrix Electronics and suitable for industrial control systems, legacy telecom infrastructure, avionics subsystems, and medical imaging equipment requiring stable component supply across extended product lifecycles.
Supply support for AT27C040-15JI 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, non-volatile memory, and analog products before its acquisition by Microchip Technology in 2016.
The AT27C040 belongs to Atmel's OTP EPROM product line, engineered for firmware and configuration storage in cost-sensitive, high-reliability industrial and telecom applications where reprogrammability is unnecessary.
FAQ
What is the correct VPP voltage for programming the AT27C040-15JI?
The AT27C040-15JI requires a precise VPP voltage of 12.0 V ±0.5 V during programming, as specified in the DC Programming Characteristics table. This voltage must be applied only during programming pulses and sequenced after VCC application. Using incorrect VPP levels risks incomplete programming or oxide damage, and the AT27C040-15JI will not verify correctly if VID on A9 falls outside 11.5–12.5 V.
Does the AT27C040-15JI support read operations at 5 MHz without WAIT states?
Yes, the AT27C040-15JI supports full-speed read operations at up to 5 MHz without WAIT states due to its 150 ns maximum access time (tACC) and fast OE-to-output delay (tOE ≤ 40 ns). The AT27C040-15JI's 30 mA active current at 5 MHz confirms it is characterized for this frequency, and its two-line control (CE/OE) prevents bus contention that could otherwise force insertion of wait cycles.
How is the Integrated Product Identification Code accessed on the AT27C040-15JI?
The AT27C040-15JI's Integrated Product Identification Code is accessed by setting A9 to 12.0 V ±0.5 V (VID), holding A1–A18 low, and toggling A0: low selects the Manufacturer ID byte (0x1E), high selects the Device Code byte (0x0B). This mode is entered during power-up or reset with CE and OE both low, and the AT27C040-15JI outputs the selected byte on O0–O7 without requiring external programming voltage on VPP.
Can the AT27C040-15JI be used in place of the AT27C040-12JI?
The AT27C040-15JI is functionally identical to the AT27C040-12JI except for its slower 150 ns maximum access time versus 120 ns. It is pin- and software-compatible, but system timing margins must accommodate the 30 ns longer tACC. The AT27C040-15JI may be substituted where the host processor's minimum read cycle exceeds 150 ns, but not in designs relying on the tighter 120 ns specification.
What decoupling capacitors are required for stable operation of the AT27C040-15JI?
The AT27C040-15JI requires a 0.1 µF high-frequency ceramic capacitor placed between VCC and GND, mounted as close as possible to the device pins, per the Switching Considerations section. For arrays with multiple AT27C040-15JI devices, a 4.7 µF bulk electrolytic capacitor must also be added near the power entry point to suppress ripple. Failure to implement both capacitors risks transient-induced non-conformance during CE transitions.
AT27C040-15JI 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:
- 150 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT27C040-15JI FAQ
1.How can I place an order for AT27C040-15JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C040-15JI 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 AT27C040-15JI reliable?
The price and inventory of AT27C040-15JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C040-15JI is usually 5 days.
3.What payment methods are accepted for AT27C040-15JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C040-15JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C040-15JI?
AT27C040-15JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C040-15JI 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 AT27C040-15JI?
For technical support, including AT27C040-15JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C040-15JI requirements.
6.How does Aetrix verify that AT27C040-15JI is sourced from the original manufacturer or authorized distributors?
All AT27C040-15JI 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 AT27C040-15JI meets industry standards.
7.What is the process for return or replacement of AT27C040-15JI?
All AT27C040-15JI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C040-15JI, 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 AT27C040-15JI part is unused and in its original packaging.
Return procedure for AT27C040-15JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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