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Microchip Technology AT27C1024-15JI
- Part No.:
- AT27C1024-15JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
AT27C1024-15JI.pdf
- Description:
- IC EPROM 1MBIT PARALLEL 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,923
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Product details
Overview
AT27C1024-15JI from Atmel is a 1-Mbit (64K × 16) one-time programmable EPROM with 40-pin PDIP packaging, 150 ns read access time, 5V ±10% supply, and industrial temperature range (–40°C to +85°C). It serves as nonvolatile firmware storage in microprocessor systems requiring reliable boot code or configuration data without reprogrammability.
For engineers reviewing the AT27C1024-15JI datasheet, AT27C1024-15JI pinout, AT27C1024-15JI application, or AT27C1024-15JI equivalent, this page delivers verified electrical specs, JEDEC-compliant package details, Rapid™ programming timing, CMOS/TTL compatibility, and real-world system integration guidance for legacy 16-bit embedded designs.
Technical Context
The AT27C1024-15JI implements a high-density OTP EPROM architecture organized as 64K words × 16 bits, supporting direct upgrade from AT27C516 (512K) devices. Its two-line control interface (CE and OE) enables bus contention-free operation in high-speed 16/32-bit microprocessor buses.
It uses Atmel's Rapid™ Programming Algorithm with 100 µs/word typical programming pulse width at VPP = 13.0 V and VCC = 6.5 V, and features integrated product identification code accessible via A9 and A0 for automated programmer recognition.
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 banking logic. |
| Read Access Time | 150 ns max - eliminates WAIT states in 6.67 MHz CPU bus cycles (e.g., Intel 80286, Motorola 68020). |
| Supply Voltage | 5V ±10% - compatible with standard TTL/CMOS logic rails; no auxiliary voltage required in read mode. |
| Active Current | 30 mA max at 5 MHz - supports sustained burst reads without thermal derating in industrial enclosures. |
| Standby Current | 100 µA max (CMOS CE input) - enables low-power hold during processor sleep in battery-backed systems. |
| Programming Voltage | VPP = 13.0 V ±0.25 V - requires dedicated EPROM programmer with regulated high-voltage supply; not supported by standard logic-level programmers. |
| ESD Protection | 2000 V HBM - ensures robustness during manual handling and PCB assembly in uncontrolled environments. |
Pinout & Package
AT27C1024-15JI is supplied in a 40-lead, 0.600" wide plastic dual inline package (PDIP), JEDEC MS-011 AC compliant, with 2×20 pin layout and dual GND pins (pins 10 and 24) requiring connection per datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus interface; latched on CE low transition; all 16 bits required to select any of 64K words. |
| O0–O15 | Data Outputs | 16-bit bidirectional data bus outputs; high-impedance when OE or CE high; TTL/CMOS compatible VOH/VOL. |
| CE | Chip Enable | Primary device select; must be low for read or program; controls standby current path (ISB1/ISB2). |
| OE | Output Enable | Secondary output gate; allows shared bus operation; float timing tDF ≤ 40 ns ensures clean bus release. |
| PGM | Program Strobe | Active-low pulse input (100 µs width) that initiates word programming when VPP = 13 V and CE = low. |
| VPP | Programming Voltage | 13 V input pin; must be applied after VCC and removed before VCC; requires 0.1 µF ceramic decoupling to ground. |
| GND (Pins 10, 24) | Ground Reference | Two independent ground connections required; both must be tied to system ground plane to meet ICC/ISB specs. |
| VCC | Power Supply | 5 V ±10% main supply; powers core logic and outputs; requires 0.1 µF ceramic + 4.7 µF bulk capacitor per device. |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/word typical programming time with auto-verify loop - reduces firmware burn time by >5× vs. legacy EPROMs. |
| Integrated Product ID Code | Manufacturer ID (001Eh) and Device Code (00F1h) readable via A9=12 V and A0 toggle - enables plug-and-play programmer setup. |
| JEDEC Standard Packages | 40-pin PDIP (40P6) footprint - ensures drop-in replacement for AT27C516 and compatibility with legacy socketed systems. |
| Two-Line Control Interface | Independent CE and OE inputs - permits flexible bus arbitration and eliminates need for external gating logic in multiprocessor systems. |
| High-Reliability Process | 200 mA latchup immunity and 2000 V ESD protection - validated for industrial control panels and factory automation equipment. |
Applications
| Industrial PLC Firmware Storage | Legacy 16-Bit Microprocessor Boot ROM |
|---|---|
|
Use Scenario: Fixed logic firmware stored in programmable ROM for programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Nonvolatile boot memory providing deterministic startup sequence and runtime configuration data to an 80C186 or Z8000 CPU. Use Value: 150 ns access time ensures zero-wait-state execution; industrial temp rating (–40°C to +85°C) guarantees reliability across ambient shifts in control cabinets. |
Use Scenario: Read-only firmware image for vintage 16-bit computer systems or test equipment where field updates are unnecessary. IC Role / Device Role / Timing Role: Primary instruction ROM mapped into upper memory space of a Motorola 68000-based design. Use Value: 64K × 16 organization matches native bus width; PDIP package enables hand-soldering and socket-based field replacement. |
| Automated Test Equipment (ATE) Configuration Memory | Military-Grade Avionics Boot Loader |
|
Use Scenario: Calibration constants and test pattern tables stored permanently in rack-mounted ATE platforms used in semiconductor final test. IC Role / Device Role / Timing Role: Static configuration store accessed during power-on self-test (POST) prior to FPGA initialization. Use Value: 100 µA max standby current minimizes quiescent load on backup batteries; 2000 V ESD withstand protects against handler-induced transients. |
Use Scenario: Secure boot loader code for airborne mission computers where firmware integrity and tamper resistance are critical. IC Role / Device Role / Timing Role: One-time-programmed root-of-trust ROM ensuring unmodified startup instructions execute before secure boot chain activation. Use Value: OTP architecture prevents post-deployment modification; industrial-grade packaging meets MIL-STD-883 screening requirements for vibration and thermal shock. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C512-15JC | 512 Kbit (64K × 8), 44-pin PLCC, 150 ns access, commercial temp only. | Supports 8-bit data buses; lacks A15 and O8–O15 pins; insufficient capacity for 16-bit firmware images. | Select only if system uses 8-bit microcontroller and board layout accommodates PLCC socket. |
| AM27C1024-15DC | Same 1-Mbit (64K × 16) OTP EPROM, 40-pin PDIP, but manufactured by AMD; identical AC/DC specs and pinout. | Drop-in functional replacement with same programming algorithm and ID code structure; qualified for industrial temp. | Valid alternative when Atmel supply is constrained; verify lot traceability and programming tool compatibility. |
Compared with AT27C1024-15JI, AT27C512-15JC halves memory width and capacity-requiring software byte-packing or dual-device interleaving-while AM27C1024-15DC offers identical functionality and pin compatibility, making it the only true functional substitute for industrial 16-bit systems.
Availability
AT27C1024-15JI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy 16-bit microprocessor boot ROM, and automated test equipment configuration memory requiring stable component supply across extended production lifecycles.
Supply support for AT27C1024-15JI 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 designer specializing in microcontrollers, nonvolatile memory, and security ICs before its acquisition by Microchip Technology in 2016.
The AT27C1024 product line delivers high-reliability OTP EPROMs optimized for firmware storage in industrial, automotive, and military embedded systems where code immutability and long-term data retention are mandatory.
FAQ
What is the maximum operating temperature range for the AT27C1024-15JI?
The AT27C1024-15JI 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 "JI" suffix explicitly denotes the industrial grade. The device maintains full DC and AC performance across this range, including 150 ns access time and 100 µA standby current compliance.
Does the AT27C1024-15JI support in-circuit programming?
No, the AT27C1024-15JI does not support in-circuit programming. It requires a dedicated EPROM programmer applying 13.0 V to VPP and 6.5 V to VCC during programming, with precise 100 µs PGM pulses. The device lacks serial interfaces or internal voltage charge pumps, and its PDIP package is intended for socketed programming prior to system insertion.
Can the AT27C1024-15JI be used as a direct replacement for the AT27C516?
Yes, the AT27C1024-15JI is specified as a direct upgrade from the AT27C516 (512K × 8). While pin-compatible in 40-pin PDIP, it doubles density to 64K × 16 and adds A15/O8–O15 pins. System redesign is needed to exploit full width, but 8-bit mode operation is supported using lower byte outputs (O0–O7) and address lines A0–A14.
What decoupling capacitors are required for stable operation of the AT27C1024-15JI?
The AT27C1024-15JI requires two decoupling capacitors: a 0.1 µF high-frequency 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 values are mandated in the "System Considerations" section (page 2) to suppress transient excursions during CE switching and stabilize VCC under active current draw.
How is the manufacturer and device identification code read from the AT27C1024-15JI?
The AT27C1024-15JI identification code is read by setting A9 to 12.0 V (VID = 11.5–12.5 V), holding A1–A15 low, and toggling A0: low selects Manufacturer ID (001Eh), high selects Device Code (00F1h). Outputs O0–O15 reflect the 16-bit hex code while CE and OE are low. This method is documented in Note 4 on page 3 and the Identification Code table on page 8 of the datasheet.
AT27C1024-15JI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 44-LCC (J-Lead)
- 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:
- 150 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 44-PLCC (16.6x16.6)
AT27C1024-15JI FAQ
1.How can I place an order for AT27C1024-15JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C1024-15JI 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 AT27C1024-15JI reliable?
The price and inventory of AT27C1024-15JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C1024-15JI is usually 5 days.
3.What payment methods are accepted for AT27C1024-15JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C1024-15JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C1024-15JI?
AT27C1024-15JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C1024-15JI 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 AT27C1024-15JI?
For technical support, including AT27C1024-15JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C1024-15JI requirements.
6.How does Aetrix verify that AT27C1024-15JI is sourced from the original manufacturer or authorized distributors?
All AT27C1024-15JI 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 AT27C1024-15JI meets industry standards.
7.What is the process for return or replacement of AT27C1024-15JI?
All AT27C1024-15JI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C1024-15JI, 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 AT27C1024-15JI part is unused and in its original packaging.
Return procedure for AT27C1024-15JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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