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Microchip Technology AT27C040-15PC
- Part No.:
- AT27C040-15PC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-DIP (0.600", 15.24mm)
- Datasheet:
-
AT27C040-15PC.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 32DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,858
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Product details
Overview
AT27C040-15PC 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 150 ns read access time, draws ≤100 µA standby current, and supports commercial temperature range (0°C to 70°C) in a 32-lead PDIP package. It is used in firmware boot memory for industrial controllers and legacy embedded systems requiring field-programmable ROM.
For engineers reviewing the AT27C040-15PC datasheet, AT27C040-15PC pinout, AT27C040-15PC application, or AT27C040-15PC equivalent, key selection criteria include verified 150 ns tACC timing, VPP = 12.0 V programming voltage compatibility, JEDEC-standard 32P6 PDIP footprint, and OTP reliability for unmodified production code storage.
Technical Context
The AT27C040-15PC implements a CMOS-based OTP EPROM architecture with dual-line control (CE and OE) to prevent bus contention during high-speed read cycles. Its address decoding covers A0–A18 (512K locations), and output drivers are TTL/CMOS compatible with VOH ≥2.4 V and VOL ≤0.4 V under load.
Programming uses Atmel's Rapid™ algorithm with 100 µs/byte CE pulses at VCC = 6.5 V and VPP = 13.0 V, supported by integrated product identification (Manufacturer ID = 0x1E, Device ID = 0x0B) for automated programmer recognition. Standby mode disables outputs and reduces ICC to ≤100 µA via CE high assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4,194,304-bit (512K × 8) - supports full 19-bit address space for 8-bit microprocessor data buses |
| Read Access Time (tACC) | 150 ns max - defines minimum clock cycle spacing for zero-wait-state operation with 6.67 MHz CPU bus |
| Supply Voltage | 5 V ±10% - compatible with standard TTL/CMOS logic rails; no auxiliary voltage required for read mode |
| Standby Current (ISB1) | 100 µA max - enables low-power retention in battery-backed or intermittent-power systems |
| Active Current (ICC) | 30 mA max at 5 MHz - determines power budget for sustained read bursts in controller firmware fetch paths |
| VPP Programming Voltage | 12.0 V ±0.5 V - required only during programming; must be applied after VCC and removed before VCC |
| ESD Protection | 2000 V HBM - ensures handling robustness during manual PCB assembly and rework |
Pinout & Package
AT27C040-15PC is packaged in a 32-lead, 0.600" wide plastic dual inline package (PDIP), per JEDEC MS-001, designated 32P6. Pin 1 is marked by a notch or dot; leads are spaced 0.100" (2.54 mm) apart.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit binary address bus; selects one of 524,288 bytes; all must be stable before CE/OE assertion |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus in read mode; high-impedance when OE or CE is high |
| 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 without disabling CE |
| VPP | Programming Voltage | 12 V input required only during programming; must be isolated from VCC except during write cycles |
| VCC | Power Supply | +5 V main supply; powers logic and output drivers; must be present before VPP during programming |
| 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 - reduces firmware update time by >90% vs. conventional EPROM algorithms |
| Integrated Product ID Code | Manufacturer ID = 0x1E, Device ID = 0x0B - enables automatic algorithm selection in universal programmers |
| Two-Line Control (CE + OE) | Independent chip and output gating - eliminates bus contention in multi-device memory maps |
| CMOS/TTL I/O Compatibility | VIL ≤0.8 V, VIH ≥2.0 V, VOH ≥2.4 V - interoperates with both 5 V logic families without level shifters |
| Latchup Immunity | 200 mA - prevents destructive latchup during transient overvoltage or hot-insertion events |
Applications
| Industrial PLC Firmware Storage | Legacy Medical Device Boot ROM |
|---|---|
Use Scenario: Storing fixed boot code and diagnostic routines in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile program memory mapped to CPU reset vector; accessed at power-on and during firmware recovery sequences. Use Value: 150 ns tACC enables direct execution from ROM on 6.67 MHz Z80 or 80C88-based controllers without wait states. |
Use Scenario: Holding immutable initialization firmware in Class II medical instruments where regulatory approval prohibits field-upgradable code. IC Role / Device Role / Timing Role: One-time programmable boot ROM providing deterministic startup behavior and traceable firmware versioning. Use Value: Integrated product ID (0x1E/0x0B) allows automated verification during manufacturing test, satisfying IEC 62304 traceability requirements. |
| Military Communications Radio BIOS | Automotive Engine Control Module Calibration |
Use Scenario: Storing radio initialization parameters and cryptographic keys in ruggedized HF/VHF transceivers operating across -40°C to +85°C. IC Role / Device Role / Timing Role: OTP EPROM used for secure, tamper-resistant storage of calibration constants and secure boot signatures. Use Value: 2000 V HBM ESD rating ensures survivability during field maintenance in high-static military environments. |
Use Scenario: Storing engine calibration tables and emission control logic in pre-OBD-II automotive ECUs where firmware updates are prohibited post-certification. IC Role / Device Role / Timing Role: Fixed-function ROM providing deterministic timing-critical lookup tables for fuel injection timing. Use Value: 100 µA max standby current minimizes parasitic drain on vehicle battery during extended off-cycle 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 (512K × 8) OTP EPROM; 150 ns tACC; but uses AMD's proprietary programming algorithm and ID codes (0x20/0x1B) | Requires AMD-specific programmer support; lacks Atmel's Rapid™ verification loop | Select if existing toolchain supports AMD devices and VPP tolerance matches system design |
| MX27C4001-15PC | Pin-compatible 4-Mbit OTP EPROM; identical 32P6 PDIP; 150 ns tACC; but higher 200 µA standby current and no integrated ID code | No automated programmer ID detection; requires manual algorithm selection and voltage setup | Choose when cost sensitivity outweighs programming efficiency and traceability needs |
Compared with AM27C040-15DC and MX27C4001-15PC, the AT27C040-15PC offers faster programming via Rapid™, guaranteed 100 µA standby compliance, and built-in ID coding for audit-ready firmware validation-making it preferred for regulated or high-volume production environments.
Availability
AT27C040-15PC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy medical device boot ROM, military radio BIOS, and automotive ECU calibration requiring stable component supply and long-term obsolescence management.
Supply support for AT27C040-15PC 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 manufacturer specializing in microcontrollers, nonvolatile memory, and RF ICs before its acquisition by Microchip Technology in 2016.
The AT27C040-15PC belongs to Atmel's legacy OTP EPROM product line, engineered for reliable, field-programmable firmware storage in cost-sensitive, high-reliability embedded systems where code immutability is mandatory.
FAQ
What is the maximum allowable VPP voltage for programming the AT27C040-15PC?
The AT27C040-15PC requires VPP = 12.0 V ±0.5 V during programming, with absolute maximum rating of +14.0 V. Exceeding 12.5 V risks oxide damage and premature bit failure. The AT27C040-15PC datasheet specifies VID = 11.5–12.5 V for A9 product ID access, confirming tight tolerance dependency. Always apply VPP after VCC and remove it before VCC to prevent latchup.
Does the AT27C040-15PC support read operations at 3.3 V?
No, the AT27C040-15PC is specified only for 5 V ±10% operation. Its DC characteristics-including VIH ≥2.0 V, VOL ≤0.4 V, and ICC active current-are validated exclusively at VCC = 4.5–5.5 V. Attempting 3.3 V read operation results in undefined outputs, excessive tACC, and potential bus contention due to marginal noise margins. The AT27C040-15PC has no 3.3 V mode or dual-voltage support.
How many times can the AT27C040-15PC be programmed?
The AT27C040-15PC is a one-time programmable (OTP) EPROM: it can be programmed exactly once. The Rapid™ algorithm applies up to ten 100 µs CE pulses per byte during verification, but the silicon fuse structure permanently alters conduction paths after initial programming. Repeated programming attempts beyond first pass cause irreversible parametric degradation. The AT27C040-15PC is not erasable-no UV window or electrical erase function exists.
What decoupling capacitance is required for stable operation of the AT27C040-15PC?
Each AT27C040-15PC requires a 0.1 µF high-frequency ceramic capacitor placed between VCC and GND, mounted as close as possible to the device pins. For systems with multiple AT27C040-15PC units or high-current loads, a 4.7 µF bulk electrolytic capacitor must also be added near the array's power entry point. This dual-capacitor strategy suppresses switching transients that could exceed the AT27C040-15PC's ±7.0 V absolute maximum pin voltage rating.
Is the AT27C040-15PC pin-compatible with the AT27C040-12PC?
Yes, the AT27C040-15PC is fully pin-compatible with the AT27C040-12PC and all other AT27C040 speed grades (-70, -90, -12, -15). They share identical 32-lead PDIP (32P6) packaging, pin functions, DC electrical characteristics, and AC timing parameter definitions-only tACC (150 ns vs. 120 ns) and associated read timing differ. PCB layouts designed for AT27C040-12PC accept AT27C040-15PC without modification, though system timing margins must accommodate the slower access.
AT27C040-15PC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-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:
- 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:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 32-PDIP
AT27C040-15PC FAQ
1.How can I place an order for AT27C040-15PC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C040-15PC 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 AT27C040-15PC reliable?
The price and inventory of AT27C040-15PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C040-15PC is usually 5 days.
3.What payment methods are accepted for AT27C040-15PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C040-15PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C040-15PC?
AT27C040-15PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C040-15PC 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 AT27C040-15PC?
For technical support, including AT27C040-15PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C040-15PC requirements.
6.How does Aetrix verify that AT27C040-15PC is sourced from the original manufacturer or authorized distributors?
All AT27C040-15PC 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 AT27C040-15PC meets industry standards.
7.What is the process for return or replacement of AT27C040-15PC?
All AT27C040-15PC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C040-15PC, 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 AT27C040-15PC part is unused and in its original packaging.
Return procedure for AT27C040-15PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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