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Microchip Technology AT27C040-70PI
- Part No.:
- AT27C040-70PI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-DIP (0.600", 15.24mm)
- Datasheet:
-
AT27C040-70PI.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 32DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,382
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Product details
Overview
AT27C040-70PI from Atmel is a 4-Mbit (512K × 8) one-time programmable EPROM designed for nonvolatile program storage in microprocessor systems. It delivers 70 ns read access time, operates on a single 5V ±10% supply, and supports industrial temperature range (–40°C to +85°C) in a 32-lead PDIP package. Its dual-line control (CE/OE) enables bus contention-free operation in high-speed embedded designs.
For engineers reviewing the AT27C040-70PI datasheet, AT27C040-70PI pinout, AT27C040-70PI application, or AT27C040-70PI equivalent, key selection criteria include verified 70 ns access timing, 100 µA max standby current, industrial-grade reliability (2000V ESD, 200 mA latchup immunity), Rapid™ programming at 100 µs/byte, and JEDEC-standard PDIP compatibility.
Technical Context
The AT27C040-70PI implements a CMOS OTP EPROM architecture with address decoding for 19-bit address space (A0–A18), 8-bit parallel data outputs (O0–O7), and dedicated VPP pin for 12.0 V ±0.5 V programming voltage. It uses two independent enable controls-Chip Enable (CE) and Output Enable (OE)-to manage output state and power mode transitions.
Its Rapid™ Programming Algorithm executes 100 µs CE pulses per byte with verification loops, requiring precise VCC/VPP sequencing (VCC applied before VPP, removed after). The Integrated Product Identification Code (Manufacturer ID = 0x1E, Device ID = 0x0B) is accessed via A9 = 12.0 V and A0 toggling, enabling automated programmer recognition.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4,194,304 bits (512K × 8) - supports full instruction/code storage for 8-bit microcontrollers without external banking logic. |
| Read Access Time | 70 ns maximum - eliminates WAIT states on 14 MHz+ Z80, 8051, or 68K-based systems operating at 5 MHz. |
| Supply Voltage | 5 V ±10% - compatible with standard TTL/CMOS logic rails; no auxiliary voltage regulators required. |
| Standby Current | 100 µA maximum - enables low-power retention in battery-backed or energy-constrained industrial controllers. |
| Programming Voltage | VPP = 12.0 V ±0.5 V - requires dedicated programming circuitry; not compatible with standard 5 V-only programmers. |
| Operating Temperature | –40°C to +85°C - validated for deployment in motor drives, PLC I/O modules, and outdoor instrumentation. |
| ESD Protection | 2000 V HBM - meets IEC 61000-4-2 Level 2 for handling in unshielded industrial assembly environments. |
Pinout & Package
AT27C040-70PI is packaged in a 32-lead, 0.600-inch wide plastic dual in-line package (PDIP), JEDEC standard 32P6. Pin 1 is marked by a notch or dot; leads are spaced at 2.54 mm (0.100 inch) pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus interface; fully decoded internally to select one of 524,288 bytes. |
| O0–O7 | Data Outputs | CMOS/TTL-compatible bidirectional data bus drivers; high-impedance when CE or OE inactive. |
| CE | Chip Enable | Active-low global device select; must be asserted before OE to avoid bus contention during read cycles. |
| OE | Output Enable | Active-low output gate; allows multiple devices on same data bus with shared CE but individual OE control. |
| VPP | Programming Voltage | 12.0 V input during programming only; must be isolated from VCC except during verified programming sequences. |
| VCC | Power Supply | 5 V ±10% main supply; powers logic and output drivers during read; supplies internal charge pumps during programming. |
| GND | Ground Reference | Common return path for VCC and VPP; requires local 0.1 µF ceramic decoupling per device per datasheet layout guidance. |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time with auto-verify loop - reduces production burn-in time by >70% vs. legacy EPROMs. |
| Integrated Product Identification Code | Manufacturer ID (0x1E) and Device ID (0x0B) readable via A9=12 V and A0 toggle - ensures firmware tools auto-detect correct programming algorithm and voltage profiles. |
| Two-Line Control Architecture | Independent CE and OE inputs - enables partial memory mapping and eliminates data bus conflicts in multi-chip memory subsystems. |
| High-Reliability CMOS Process | 200 mA latchup immunity and 2000 V HBM ESD rating - sustains operation in electrically noisy factory-floor PLC and motor-control environments. |
| JEDEC-Standard PDIP Packaging | 32P6 footprint - ensures drop-in replacement for legacy 27C400/27C040 variants in existing through-hole PCBs without redesign. |
Applications
| Industrial PLC Firmware Storage | Legacy Microcontroller Boot ROM |
|---|---|
Use Scenario: Storing ladder logic interpreter and I/O configuration tables in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile boot memory providing deterministic 70 ns instruction fetch latency to ensure real-time scan cycle timing compliance. Use Value: Industrial temperature rating and 200 mA latchup immunity prevent runtime corruption during 24/7 operation in electrically noisy control cabinets. | Use Scenario: Holding fixed startup code and peripheral initialization routines for 8051 or Z80-based embedded instruments. IC Role / Device Role / Timing Role: Primary ROM executing immediately after reset; its 70 ns access time matches CPU bus timing without wait-state insertion. Use Value: Single 5 V supply simplifies power design; CMOS/TTL compatibility eliminates level-shifter components in mixed-logic systems. |
| Automated Test Equipment (ATE) Pattern Memory | Medical Device Calibration Data Storage |
Use Scenario: Storing digital stimulus/response patterns for semiconductor wafer probing systems requiring repeatable, unalterable test vectors. IC Role / Device Role / Timing Role: OTP memory ensuring pattern integrity across thousands of test cycles; CE/OE control enables synchronized vector streaming from FPGA sequencer. Use Value: Rapid™ programming allows fast pattern updates during engineering validation; 2000 V ESD protection prevents field-programming damage during lab handling. | Use Scenario: Retaining factory-calibrated sensor offset/gain coefficients in portable diagnostic analyzers subject to regulatory traceability requirements. IC Role / Device Role / Timing Role: Immutable calibration store accessed once per power-on; VPP isolation prevents accidental reprogramming during clinical use. Use Value: Industrial temperature range guarantees data retention over device lifetime even in non-climate-controlled hospital storage; JEDEC PDIP facilitates manual replacement during service. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C040-70DC | Same 4-Mbit size and 70 ns speed, but AMD-manufactured; requires 12.5 V VPP and has 150 µA max standby current. | Valid for same microprocessor boot roles, but higher VPP tolerance (12.5 V) may require minor programmer voltage adjustment. | Select AM27C040-70DC only if existing programming infrastructure supports 12.5 V VPP and AMD's qualification documentation is required for legacy OEM audits. |
| MX27C4001-70PC | Macronix variant with identical 32-pin PDIP, 70 ns access, and 5 V operation; differs in programming algorithm timing and ID code structure. | Compatible in read-mode circuits, but requires updated programmer firmware to handle different ID byte addressing (A10/A11 instead of A9/A0). | Choose MX27C4001-70PC when sourcing continuity is critical and programming equipment can be reconfigured for Macronix-specific command sequences. |
Compared with AM27C040-70DC and MX27C4001-70PC, the AT27C040-70PI offers tighter standby current (100 µA vs. 150 µA/200 µA), guaranteed 12.0 V VPP compatibility, and Atmel's standardized Rapid™ algorithm-making it optimal for new designs prioritizing low-power retention and programming repeatability.
Availability
AT27C040-70PI is available at Aetrix Electronics and suitable for industrial automation, legacy microcontroller boot systems, and medical device calibration storage requiring stable component supply across extended product lifecycles.
Supply support for AT27C040-70PI 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, nonvolatile memory, and analog products before its acquisition by Microchip Technology in 2016.
The AT27C040-70PI belongs to Atmel's OTP EPROM product line, engineered for reliable, cost-effective firmware and configuration storage in industrial and embedded systems where code immutability and long-term data retention are mandatory.
FAQ
What is the maximum allowed VPP voltage for programming the AT27C040-70PI?
The AT27C040-70PI requires VPP = 12.0 V ± 0.5 V during programming, as specified in the Absolute Maximum Ratings table. Exceeding 12.5 V risks permanent damage to the oxide layer; using less than 11.5 V may cause incomplete programming or verification failure. Always sequence VCC before VPP and remove VPP before VCC to prevent latchup.
Does the AT27C040-70PI support read operations at 3.3 V?
No, the AT27C040-70PI is strictly a 5 V ±10% device. Its DC and AC specifications-including VIH, VOL, and tACC-are characterized only at VCC = 4.5 V to 5.5 V. Operating at 3.3 V will result in undefined behavior, failed reads, or excessive current draw due to improper threshold biasing of internal CMOS gates.
How is the Integrated Product Identification Code read from the AT27C040-70PI?
To read the AT27C040-70PI identification code, apply VPP = 12.0 V, set A9 = 12.0 V (VIH), hold A1–A18 = VIL, and toggle A0 between VIL (for Manufacturer ID = 0x1E) and VIH (for Device ID = 0x0B). Outputs O0–O7 then present the corresponding 8-bit hex value. This function is used by certified programmers to auto-select correct algorithms.
Can the AT27C040-70PI be used in place of the AT27C040-90PI without hardware changes?
Yes-the AT27C040-70PI is pin- and function-compatible with the AT27C040-90PI, differing only in maximum access time (70 ns vs. 90 ns) and tested speed grade. Both share identical pinout, voltage specs, programming method, and temperature range. Substituting the -70PI improves system timing margin but requires no PCB or schematic modifications.
What decoupling capacitance is required for stable operation of the AT27C040-70PI?
The AT27C040-70PI requires a minimum 0.1 µF high-frequency ceramic capacitor placed between VCC and GND, located as close as possible to pins 16 (VCC) and 32 (GND). For systems with multiple EPROMs, add a 4.7 µF bulk electrolytic capacitor near the power entry point to suppress array-level supply droop during simultaneous output transitions.
AT27C040-70PI 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:
- 70 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 32-PDIP
AT27C040-70PI FAQ
1.How can I place an order for AT27C040-70PI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C040-70PI 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 AT27C040-70PI reliable?
The price and inventory of AT27C040-70PI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C040-70PI is usually 5 days.
3.What payment methods are accepted for AT27C040-70PI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C040-70PI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C040-70PI?
AT27C040-70PI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C040-70PI 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 AT27C040-70PI?
For technical support, including AT27C040-70PI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C040-70PI requirements.
6.How does Aetrix verify that AT27C040-70PI is sourced from the original manufacturer or authorized distributors?
All AT27C040-70PI 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 AT27C040-70PI meets industry standards.
7.What is the process for return or replacement of AT27C040-70PI?
All AT27C040-70PI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C040-70PI, 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 AT27C040-70PI part is unused and in its original packaging.
Return procedure for AT27C040-70PI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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