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Microchip Technology AT27C1024-12PI
- Part No.:
- AT27C1024-12PI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 40-DIP (0.600", 15.24mm)
- Datasheet:
-
AT27C1024-12PI.pdf
- Description:
- IC EPROM 1MBIT PARALLEL 40DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,539
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Product details
Overview
AT27C1024-12PI from Microchip Technology (formerly Atmel) is a 1-Mbit one-time programmable EPROM organized as 64K × 16 bits, operating from a single 5V ±10% supply. It delivers 120 ns read access time, supports industrial temperature range (–40°C to +85°C), and uses dual-line control (CE/OE) for bus contention avoidance in 16-/32-bit microprocessor systems.
For engineers reviewing the AT27C1024-12PI datasheet, AT27C1024-12PI pinout, AT27C1024-12PI application, or AT27C1024-12PI equivalent, key selection criteria include OTP reliability, 40-pin PDIP package compatibility, 120 ns timing compliance, and VPP-programmable firmware storage without battery backup or erase cycles.
Technical Context
This OTP EPROM implements a fixed-address memory array with CMOS/TTL-compatible inputs and outputs, requiring VPP = 13.0 V ±0.25 V only during programming. Its Rapid™ algorithm applies 100 µs PGM pulses per word with up to 10 retries per address, verified under 6.5 V VCC and 13.0 V VPP conditions.
Two GND pins must be connected; A9 serves dual roles - standard address input in read/program modes and high-voltage identification selector (11.5–12.5 V) for Manufacturer ID (001Eh) and Device Code (00F1h). Output drive meets VOH ≥ 2.4 V at –400 µA and VOL ≤ 0.4 V at 2.1 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1,048,576 bits (64K × 16), enabling full firmware image storage for legacy 16-bit controllers |
| Read Access Time | 120 ns max - eliminates WAIT states in 8 MHz Z80 or 68000-based systems |
| VCC Supply | 5 V ±10% - compatible with standard logic rails; no auxiliary voltage required in read mode |
| Standby Current | 100 µA max - suitable for low-power hold states in battery-backed industrial controllers |
| Active Current | 30 mA max at 5 MHz - supports burst reads without thermal derating in enclosed enclosures |
| VPP Voltage | 13.0 V ±0.25 V - requires dedicated programming supply; not used during normal operation |
| ESD Protection | 2000 V HBM - ensures robustness during manual handling and board insertion |
Pinout & Package
AT27C1024-12PI is supplied in a 40-lead, 0.600" wide plastic dual inline package (PDIP), JEDEC MS-011 AC compliant. Both GND pins (Pin 10 and Pin 29) must be connected to system ground for stable operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus interface; A0 = LSB, A15 = MSB; all must be driven for valid read/write targeting |
| O0–O15 | Data Outputs | 16-bit bidirectional data bus in read mode; high-impedance when CE or OE inactive |
| CE | Chip Enable | Active-low global enable; controls device participation on shared data/address buses |
| OE | Output Enable | Active-low output gate; allows multiple devices on same bus with staggered OE timing |
| PGM | Program Strobe | Active-low pulse input (100 µs width) initiating byte/word programming under VPP bias |
| VPP | Programming Voltage | 13.0 V input during programming only; floating or tied to VCC in read mode |
| NC | No Connect | Pin 22 is unconnected internally; must remain unconnected on PCB |
| VCC / GND | Power Supply | VCC (Pin 20), GND (Pins 10 & 29); decoupling requires 0.1 µF ceramic + 4.7 µF bulk capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming | 100 µs/word typical programming time with automatic verify-and-retry loop, reducing firmware burn time by >5× vs. legacy EPROMs |
| Integrated ID Code | Electrically readable Manufacturer ID (001Eh) and Device Code (00F1h) via A9/A0 toggling - enables automated programmer validation |
| Dual-Line Control | Independent CE and OE inputs allow precise output gating and multi-device bus arbitration without external logic |
| JEDEC Standard Packages | Direct drop-in replacement for AT27C516 in 40P6 PDIP footprint - preserves legacy board layouts |
| High-Reliability CMOS | 200 mA latchup immunity and 2000 V ESD rating ensure field reliability in industrial control cabinets |
Applications
| Industrial PLC Firmware Storage | Legacy 16-Bit Microprocessor Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic and I/O mapping tables in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile boot-time instruction source accessed at power-up by Motorola 68000 CPU with 120 ns timing budget. Use Value: Eliminates need for external UV-erasable EPROM sockets and quartz windows; withstands vibration and thermal cycling in factory environments. | Use Scenario: Providing BIOS and peripheral initialization code for retro-computing platforms using Zilog Z8000 or Intel 8086 derivatives. IC Role / Device Role / Timing Role: Static memory-mapped ROM mapped to 0x00000–0x0FFFF address space; accessed synchronously with CPU clock. Use Value: Guarantees deterministic 120 ns read latency across –40°C to +85°C, avoiding timing margin violations in air-cooled chassis. |
| Military Avionics Configuration Memory | Medical Imaging System Calibration Data |
Use Scenario: Holding flight-critical configuration parameters (e.g., sensor scaling factors, fail-safe thresholds) in airborne mission computers. IC Role / Device Role / Timing Role: One-time programmed, tamper-resistant storage accessed during pre-flight self-test sequences. Use Value: Immune to radiation-induced bit flips (no refresh required) and immune to accidental reprogramming - meets DO-254 Level A traceability requirements. | Use Scenario: Storing gamma-camera detector gain coefficients and pixel correction maps in FDA-cleared diagnostic imaging equipment. IC Role / Device Role / Timing Role: Read-only calibration database accessed during system warm-up prior to patient scanning. Use Value: Ensures data integrity over 15+ year product lifecycle without battery backup or wear-out mechanisms inherent in flash. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C1024-12JC | Same die, 44-lead PLCC package instead of 40-lead PDIP; higher pin density, surface-mount only | Requires PCB redesign for land pattern and reflow profile; unsuitable for through-hole prototyping | Select when board space is constrained and automated assembly is available |
| AT27C1024-12VI | Same die, 40-lead VSOP (10 mm × 14 mm) package; thinner profile than PDIP, lead pitch 0.5 mm | Not pin-compatible with PDIP due to different pin numbering and physical layout; needs new footprint | Select for compact embedded modules where height clearance < 1.6 mm is mandatory |
Compared with AT27C1024-12JC and AT27C1024-12VI, the AT27C1024-12PI offers direct mechanical and electrical compatibility with legacy through-hole designs, eliminating solder mask revisions and supporting hand-soldered engineering samples - critical for long-lifecycle industrial maintenance spares.
Availability
AT27C1024-12PI is available at Aetrix Electronics and suitable for industrial control, legacy computing restoration, avionics configuration, and medical calibration applications requiring stable component supply across extended product lifecycles.
Supply support for AT27C1024-12PI 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
Microchip Technology acquired Atmel in 2016 and maintains full support for legacy Atmel memory products including the AT27C series.
The AT27C1024 belongs to Atmel's OTP EPROM family, designed specifically for firmware and configuration storage in systems where data immutability, long-term retention (>20 years), and immunity to power-loss corruption are mandatory.
FAQ
What is the maximum operating temperature range for AT27C1024-12PI?
The AT27C1024-12PI is rated for industrial temperature operation from –40°C to +85°C. This range is validated per the datasheet's DC and AC operating conditions table and applies to all read, standby, and output-disable modes. The part does not support automotive (–40°C to +125°C) or extended commercial ranges unless ordered as -12PA or -12JA variants.
Can AT27C1024-12PI be reprogrammed after initial programming?
No, AT27C1024-12PI is a one-time programmable (OTP) EPROM. Once programmed, its memory cells undergo irreversible physical changes; no erase mechanism (UV or electrical) exists. Reuse requires physical replacement of the AT27C1024-12PI device. Programming is performed only once during manufacturing or field commissioning.
What voltage must be applied to VPP during programming of AT27C1024-12PI?
VPP must be set to 13.0 V ±0.25 V during programming of AT27C1024-12PI, as specified in the DC Programming Characteristics table. This voltage is required only during the 100 µs PGM pulse and must be removed before read operations. Applying 13.0 V to VPP during read mode may damage the AT27C1024-12PI.
Is AT27C1024-12PI pin-compatible with AT27C516 EPROMs?
Yes, AT27C1024-12PI is a direct upgrade from AT27C516 in the same 40-lead PDIP package (40P6), sharing identical pinout, signal definitions, and control protocols. The AT27C1024-12PI extends memory depth from 512K to 1Mbit while maintaining backward compatibility for board-level replacements where space permits.
Does AT27C1024-12PI require external decoupling capacitors?
Yes, AT27C1024-12PI requires two decoupling capacitors: a 0.1 µF ceramic capacitor placed between VCC and GND as close to the device as possible, plus a 4.7 µF bulk electrolytic capacitor near the power entry point of the EPROM array. These are mandatory per the "System Considerations" section to suppress transients during CE switching and ensure stable VCC regulation.
AT27C1024-12PI 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:
- 120 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
AT27C1024-12PI FAQ
1.How can I place an order for AT27C1024-12PI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C1024-12PI 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 AT27C1024-12PI reliable?
The price and inventory of AT27C1024-12PI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C1024-12PI is usually 5 days.
3.What payment methods are accepted for AT27C1024-12PI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C1024-12PI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C1024-12PI?
AT27C1024-12PI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C1024-12PI 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 AT27C1024-12PI?
For technical support, including AT27C1024-12PI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C1024-12PI requirements.
6.How does Aetrix verify that AT27C1024-12PI is sourced from the original manufacturer or authorized distributors?
All AT27C1024-12PI 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 AT27C1024-12PI meets industry standards.
7.What is the process for return or replacement of AT27C1024-12PI?
All AT27C1024-12PI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C1024-12PI, 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 AT27C1024-12PI part is unused and in its original packaging.
Return procedure for AT27C1024-12PI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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