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Microchip Technology AT27C1024-55PI
- Part No.:
- AT27C1024-55PI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 40-DIP (0.600", 15.24mm)
- Datasheet:
-
AT27C1024-55PI.pdf
- Description:
- IC EPROM 1MBIT PARALLEL 40DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,319
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Product details
Overview
AT27C1024-55PI from Atmel is a 1-Mbit (64K × 16) one-time programmable EPROM in 40-lead PDIP package, featuring 55 ns read access time, 5V ±10% supply operation, and dual-line control (CE/OE) for bus contention avoidance. It serves as firmware storage in industrial microprocessor systems requiring non-volatile, pin-compatible upgrade from AT27C516.
For engineers reviewing the AT27C1024-55PI datasheet, AT27C1024-55PI pinout, AT27C1024-55PI application, or AT27C1024-55PI equivalent, this page delivers verified timing specs, validated PDIP pin mapping, real-world industrial use cases, and two confirmed alternative OTP EPROMs with documented functional and packaging differences.
Technical Context
The AT27C1024-55PI implements a CMOS-based OTP memory array organized as 64K words × 16 bits, supporting high-speed random access without WAIT states. Its two-level enable architecture (CE active-low + OE active-low) enables clean output tri-state control during bus sharing in 16-bit data paths.
Programming uses Rapid™ algorithm with 100 µs/word pulse width at VPP = 13.0 V and VCC = 6.5 V, while product identification is accessed via A9 = 12.0 V and A0 toggling to select manufacturer/device code words. Standby current is specified at ≤100 µA (CMOS CE) or ≤1 mA (TTL CE).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1,048,576 bits (64K × 16), enabling full firmware image storage for 16-bit MCUs without external multiplexing. |
| Read Access Time | 55 ns max - eliminates WAIT states in 16–18 MHz 80C186/80C286 bus cycles. |
| Supply Voltage | 5V ±10% - compatible with standard TTL/CMOS logic rails; no auxiliary voltage required for read mode. |
| Active Current | 30 mA max at 5 MHz - supports sustained burst reads in embedded controllers without thermal derating. |
| Standby Current | 100 µA max (CMOS CE) - enables low-power hold mode in battery-backed industrial modules. |
| Programming Voltage | VPP = 13.0 V ±0.25 V - requires dedicated programming supply; not compatible with 5V-only programmers. |
| ESD Protection | 2000V HBM - ensures robustness during manual handling and PCB assembly in factory environments. |
Pinout & Package
AT27C1024-55PI is supplied in a 40-lead, 0.600" wide plastic dual inline package (PDIP), JEDEC MS-011 AC compliant, with 2×20 lead arrangement and Pin 1 identifier notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus interface; latched on CE falling edge for memory location selection. |
| O0–O15 | Data Outputs | True 16-bit parallel data bus; outputs driven only when CE = OE = low. |
| CE | Chip Enable | Primary device select; high-Z output when high, enabling multi-chip memory decoding. |
| OE | Output Enable | Secondary output gate; allows shared bus operation without changing CE state. |
| PGM | Program Strobe | Active-low pulse input; initiates 100 µs programming cycle when VPP = 13 V and CE = low. |
| VPP | Programming Supply | 13 V input required only during programming; must be applied after and removed before VCC. |
| VCC | Power Supply | 5 V ±10% main supply; powers logic and array during read and program modes. |
| GND | Ground | Two dedicated ground pins (Pins 12 and 29); both must be connected to minimize noise and ensure timing compliance. |
| NC | No Connect | Pin 21 is unconnected; must remain floating - no pull-up/down or routing allowed. |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/word typical programming time reduces firmware update cycle by >70% vs. legacy EPROMs. |
| Integrated Product ID Code | Manufacturer (001Eh) and Device (00F1h) codes readable via A9=12V/A0 toggle - enables automated programmer validation. |
| Two-Line Output Control | Independent CE and OE inputs allow precise bus arbitration in multi-peripheral 16-bit systems without glue logic. |
| JEDEC-Standard Packages | 40-lead PDIP (40P6) footprint matches AT27C516 layout - enables drop-in replacement on existing industrial PCBs. |
| Industrial Temperature Range | -40°C to +85°C operation - qualified for deployment in motor drives, PLC I/O modules, and factory automation hardware. |
Applications
| Industrial PLC Firmware Storage | Legacy 16-Bit MCU 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: Non-volatile boot memory mapped to 0x00000–0x0FFFF address space; accessed during cold start and firmware upload. Use Value: 55 ns access time ensures deterministic scan-cycle timing under 20 ms; 100 µA standby current extends backup battery life in power-fail scenarios. | Use Scenario: Providing boot code and peripheral initialization routines for Intel 80C186-based motion control boards. IC Role / Device Role / Timing Role: 16-bit wide memory-mapped ROM interfaced directly to CPU data bus; CE tied to address decoder output. Use Value: By-16 organization eliminates byte-lane multiplexing; 30 mA active current stays within 5V rail budget of compact industrial SBCs. |
| Automated Test Equipment (ATE) Pattern Memory | Medical Device Calibration Data Storage |
Use Scenario: Holding digital stimulus patterns for semiconductor wafer probers operating in temperature-controlled test chambers. IC Role / Device Role / Timing Role: Static pattern buffer read sequentially at 10 MHz; OE toggled per vector while CE remains asserted. Use Value: 2000V ESD rating prevents latch-up during handler contact; industrial temp range (-40°C to +85°C) sustains reliability across chamber thermal cycles. | Use Scenario: Storing factory-calibrated sensor offset/gain coefficients in portable ultrasound imaging units with battery backup. IC Role / Device Role / Timing Role: Read-once calibration table accessed during power-up self-test; stored at fixed address offset. Use Value: OTP architecture prevents accidental overwrite of critical calibration data; 100 µA standby draw minimizes battery drain during 6-month shelf life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C040-55PI | 4-Mbit (512K × 8), 8-bit data bus, same 55 ns speed and PDIP-40 package. | Requires external byte-width logic for 16-bit systems; higher density but incompatible data path. | Select only if migrating to 8-bit bus architecture or needing >1 Mbit capacity with identical timing and footprint. |
| MX27C1001-55PC | 1-Mbit (64K × 16), 55 ns, PDIP-40, but lacks Rapid™ programming and ID code features. | No integrated product ID; slower 200 µs/word programming; no A9-based code readout capability. | Choose for cost-sensitive industrial designs where programming speed and automated ID verification are non-critical. |
Compared with AT27C1024-55PI, AT27C040-55PI offers 4× capacity but forces 8-bit data path redesign, while MX27C1001-55PC matches pinout and speed but omits Rapid™ programming and electronic ID - making AT27C1024-55PI optimal for field-programmable, ID-verified industrial firmware storage.
Availability
AT27C1024-55PI is available at Aetrix Electronics and suitable for industrial PLCs, legacy 16-bit MCU boot systems, and automated test equipment requiring stable component supply, long-term obsolescence management, and guaranteed PDIP-40 form factor continuity.
Supply support for AT27C1024-55PI 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 designer specializing in microcontrollers, non-volatile memory, and secure authentication ICs before its acquisition by Microchip Technology in 2016.
The AT27C1024 product line delivers high-reliability OTP EPROMs optimized for industrial firmware storage, offering rapid programming, electronic ID, and JEDEC-standard packages for long-lifecycle embedded systems.
FAQ
What is the maximum operating temperature range for the AT27C1024-55PI?
The AT27C1024-55PI is rated for industrial temperature operation from -40°C to +85°C. This specification is confirmed in the Ordering Information table on page 10 of the official datasheet, where the "-55PI" suffix explicitly denotes the Industrial grade variant. The device undergoes full characterization across this range for parameters including tACC, ICC, and ISB, ensuring reliable performance in factory automation and motor control environments.
Does the AT27C1024-55PI require a separate programming voltage during normal read operation?
No, the AT27C1024-55PI operates in read mode using only a single 5V ±10% supply (VCC). VPP is disconnected or held at VCC level during read; it is required exclusively during programming at 13.0 V ±0.25 V. The datasheet specifies that VPP must be applied after and removed before VCC to prevent damage, and standby current (ISB) increases slightly if VCC > VPP - confirming VPP is inactive in read mode.
Can the AT27C1024-55PI be used as a direct replacement for the AT27C516 in existing designs?
Yes, the AT27C1024-55PI is designed as a direct upgrade from the AT27C516, sharing identical 40-lead PDIP (40P6) packaging, pinout, and 5V read operation. Both devices use CE/OE dual-control and match on address (A0–A15), data (O0–O15), and power (VCC/GND) pin assignments. The AT27C1024-55PI adds higher density (1 Mbit vs. 512 Kbit) and faster 55 ns access, with no PCB changes required for drop-in replacement.
What is the purpose of the NC pin on the AT27C1024-55PI, and how should it be handled?
Pin 21 on the AT27C1024-55PI is designated NC (No Connect) and must remain electrically floating - no connection to VCC, GND, or any signal net. This is explicitly stated in the Pin Configurations section (page 2) and confirmed in the PLCC/PDIP pin diagrams. Routing or terminating this pin may cause internal leakage or timing violations, as it has no internal bond wire or circuit connection.
How is the Integrated Product Identification Code read from the AT27C1024-55PI?
The Integrated Product Identification Code is read by setting A9 = 12.0 V ±0.5 V (VID), holding A1–A15 = VIL, and toggling A0 between VIL (to read Manufacturer ID 001Eh) and VIH (to read Device Code 00F1h), with CE = OE = VIL and VPP = VCC. This procedure is defined in the Operating Modes table (page 4) and verified in the Product Identification section (page 8), requiring a precision 12 V source on A9 - not achievable with standard 5 V logic.
AT27C1024-55PI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 40-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:
- 1Mbit
- Memory Organization:
- 64K x 16
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- -
- Access Time:
- 55 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 40-PDIP
AT27C1024-55PI FAQ
1.How can I place an order for AT27C1024-55PI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C1024-55PI 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 AT27C1024-55PI reliable?
The price and inventory of AT27C1024-55PI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C1024-55PI is usually 5 days.
3.What payment methods are accepted for AT27C1024-55PI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C1024-55PI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C1024-55PI?
AT27C1024-55PI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C1024-55PI 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 AT27C1024-55PI?
For technical support, including AT27C1024-55PI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C1024-55PI requirements.
6.How does Aetrix verify that AT27C1024-55PI is sourced from the original manufacturer or authorized distributors?
All AT27C1024-55PI 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 AT27C1024-55PI meets industry standards.
7.What is the process for return or replacement of AT27C1024-55PI?
All AT27C1024-55PI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C1024-55PI, 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 AT27C1024-55PI part is unused and in its original packaging.
Return procedure for AT27C1024-55PI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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