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Microchip Technology AT27C1024-45JC
- Part No.:
- AT27C1024-45JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
AT27C1024-45JC.pdf
- Description:
- IC EPROM 1MBIT PARALLEL 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,953
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Product details
Overview
AT27C1024-45JC from Atmel is a 1-Mbit (64K × 16) one-time programmable EPROM with 45 ns read access time, 5V ±10% supply operation, and dual-line control (CE/OE) for bus contention avoidance in 16-/32-bit microprocessor systems. It features Rapid™ programming at 100 µs/word and integrated product identification code for automated programming equipment.
For engineers reviewing the AT27C1024-45JC datasheet, AT27C1024-45JC pinout, AT27C1024-45JC application, or AT27C1024-45JC equivalent, key selection criteria include 40-pin PDIP package compatibility, 45 ns timing grade, industrial temperature range (-40°C to +85°C), CMOS/TTL I/O compatibility, and OTP firmware storage requirements in legacy embedded systems.
Technical Context
The AT27C1024-45JC implements a 64K-word × 16-bit OTP memory array with address decoding for A0–A15 and bidirectional data output O0–O15. Its two-line enable architecture (CE active-low, OE active-low) enables high-speed read cycles without bus contention, supporting direct integration into microprocessor data buses.
Programming requires VPP = 13.0 V ±0.25 V and VCC = 6.5 V ±0.25 V during pulse application, with PGM strobe controlling 100 µs ±5% program pulses. Product identification uses A9 = 12.0 V and A0 toggling to select manufacturer (001Eh) or device code (00F1h) words.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1,048,576 bits (64K × 16), enabling full firmware image storage for 80x86 and 68K-based controllers |
| Read Access Time | 45 ns max - eliminates WAIT states in 22 MHz CPU systems with ≤45 ns memory cycle requirement |
| Supply Voltage | 5V ±10% - compatible with standard TTL/CMOS logic rails without external regulation |
| Active Current | 30 mA max at 5 MHz - supports low-power system-level power budgeting in battery-backed applications |
| Standby Current | 100 µA max (CMOS CE) - enables extended sleep mode in industrial controllers with infrequent firmware reads |
| Programming Voltage | VPP = 13.0 V ±0.25 V - requires dedicated high-voltage programming circuitry, not supplied by host system |
| ESD Protection | 2000 V HBM - ensures robustness during manual handling and board assembly in non-EPA environments |
Pinout & Package
AT27C1024-45JC is packaged in a 40-lead, 0.600" wide plastic dual inline package (PDIP), JEDEC MS-011 AC compliant. Both GND pins (Pin 12 and Pin 28) must be connected for stable operation.
| 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 | 16-bit bidirectional data path; three-state controlled by OE and CE to prevent bus conflicts |
| CE | Chip Enable | Primary chip-select; device enters standby when high, enabling multi-chip memory decoding |
| OE | Output Enable | Secondary output gate; allows shared bus operation with other peripherals without disabling CE |
| PGM | Program Strobe | Active-low pulse input triggering 100 µs programming cycle under VPP = 13 V conditions |
| VPP | Programming Voltage | High-voltage input (13 V) required only during programming; must be applied after VCC and removed before VCC |
| VCC | Power Supply | +5 V ±10% main supply; powers logic and memory array during read and programming modes |
| GND | Ground | Two dedicated ground pins (12, 28) required for noise immunity and current return path separation |
| NC | No Connect | Pin 21 is unconnected; must remain floating or tied to GND per layout guidelines to avoid coupling |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/word typical programming time reduces firmware update cycle duration by >90% vs. legacy EPROMs |
| Integrated Product ID Code | Manufacturer (001Eh) and device (00F1h) codes enable automatic algorithm selection in production programmers |
| Two-Line Control Architecture | Independent CE and OE inputs allow precise timing control of output enable without affecting chip selection state |
| JEDEC-Standard Packages | 40-pin PDIP (40P6) footprint ensures drop-in replacement for AT27C516 and other 512K×8 EPROMs in existing sockets |
| High-Reliability Process | 200 mA latchup immunity and 2000 V ESD protection support operation in electrically noisy industrial environments |
Applications
| Industrial PLC Firmware Storage | Legacy Automotive Engine Control Unit (ECU) |
|---|---|
Use Scenario: Storing fixed calibration tables and control logic in programmable logic controller backplanes operating at -40°C to +85°C. IC Role / Device Role / Timing Role: Nonvolatile firmware ROM providing deterministic 45 ns read latency to 16-bit microcontrollers during real-time scan cycles. Use Value: Eliminates boot-time delays from serial flash; guarantees zero-latency instruction fetch for safety-critical motion control loops. | Use Scenario: Holding engine timing maps and sensor compensation coefficients in pre-OBD-II automotive ECUs with no field-upgrade requirement. IC Role / Device Role / Timing Role: OTP memory mapped directly into 8051 or 68HC11 address space, accessed via parallel bus with CE/OE handshaking. Use Value: Immune to voltage glitch-induced corruption during cranking; avoids EEPROM wear-out limitations in high-cycle calibration updates. |
| Military Communications Baseband Processor | Medical Imaging System Boot ROM |
Use Scenario: Storing FPGA configuration bitstreams and DSP boot code in ruggedized SDR transceivers deployed in mobile command vehicles. IC Role / Device Role / Timing Role: High-reliability boot ROM interfaced to TI C6000 DSPs using 16-bit EMIF with strict 45 ns setup/hold timing. Use Value: 2000 V ESD rating prevents field failure during maintenance; rapid programming accelerates BIT (Built-In Test) firmware revision cycles. | Use Scenario: Hosting diagnostic self-test routines and minimal HAL (Hardware Abstraction Layer) in CT scanner mainboards requiring FDA-certified firmware integrity. IC Role / Device Role / Timing Role: Secure, write-once boot ROM mapped to reset vector space, preventing accidental overwrite during service mode operations. Use Value: OTP guarantee ensures immutable firmware provenance; 100 µA standby current extends UPS hold-up time during power-fail diagnostics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C512-45PC | 512K × 8 organization (448 KB), 45 ns access, same 40-pin PDIP package | Half capacity; requires two devices for 64K × 16 data width; no integrated ID code | Select when legacy board layout mandates 512K × 8 pinout and firmware fits within 512K boundary |
| MX27C1024PC-45 | Pin-compatible 64K × 16 OTP EPROM, 45 ns, same 40-pin PDIP, but lacks Rapid™ programming and ID code | Requires longer programming time (≥500 µs/word); no automated programmer ID detection | Choose for cost-sensitive replacements where programming throughput and ID verification are noncritical |
Compared with AT27C1024-45JC, AT27C512-45PC delivers lower density at identical speed and package but demands dual-device interleave for 16-bit data paths, while MX27C1024PC-45 matches density and pinout but sacrifices Rapid™ programming efficiency and identification capability-making AT27C1024-45JC optimal for high-throughput production programming and traceable firmware deployment.
Availability
AT27C1024-45JC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy automotive ECU boot ROM, military communications baseband processor, and medical imaging system boot ROM requiring stable component supply across extended lifecycle programs.
Supply support for AT27C1024-45JC 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 (now part of Microchip Technology) is a fabless semiconductor company specializing in microcontrollers, nonvolatile memory, and secure authentication ICs for industrial, automotive, and consumer applications.
The AT27C1024 product line was designed to provide high-density, low-power OTP EPROM solutions for firmware storage in 16-/32-bit microprocessor systems where field reprogrammability is unnecessary but reliability and fast read performance are critical.
FAQ
What is the maximum operating temperature range for the AT27C1024-45JC?
The AT27C1024-45JC is rated for industrial temperature operation from -40°C to +85°C. This range is confirmed in the Ordering Information table, where the suffix "JI" denotes industrial grade, and the "JC" variant shares the same thermal specification. The device meets JEDEC JESD22-A108 reliability standards for this range, including 1000-hour high-temperature operating life testing.
Does the AT27C1024-45JC require a separate programming voltage during normal read operation?
No, the AT27C1024-45JC operates from a single 5V ±10% supply during read mode. VPP (13 V) is required only during programming and must be disconnected or held at VCC level during standby/read. The datasheet explicitly states "VPP may be connected directly to VCC, except during programming," confirming no high-voltage rail is needed for functional operation of AT27C1024-45JC in system runtime.
Can the AT27C1024-45JC be used as a direct replacement for the AT27C516 in existing designs?
Yes, the AT27C1024-45JC is positioned as a direct upgrade from the AT27C516 (512K × 8). Both share the same 40-pin PDIP package (40P6), 5V supply, and CE/OE control architecture. However, AT27C1024-45JC provides double the density (64K × 16 vs. 64K × 8) and requires no hardware changes if the host system supports 16-bit data bus width and A15 addressing.
What decoupling capacitors are required for stable operation of the AT27C1024-45JC?
The AT27C1024-45JC requires a 0.1 µF ceramic capacitor between VCC and GND, placed as close as possible to the device pins, per the System Considerations section. For boards with multiple EPROMs, a 4.7 µF bulk electrolytic capacitor should also be added near the power entry point. These values are mandatory to suppress transient excursions during CE switching and ensure AT27C1024-45JC compliance with DC specifications.
How is the Integrated Product Identification Code accessed on the AT27C1024-45JC?
The AT27C1024-45JC ID code is accessed by setting A9 to 12.0 V (VID = 11.5–12.5 V) while holding A1–A15 low, then toggling A0: low selects the Manufacturer ID (001Eh), high selects the Device Code (00F1h). This occurs during special read mode with CE and OE both low, and is used by industry-standard programmers to auto-detect AT27C1024-45JC and load correct algorithms.
AT27C1024-45JC 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:
- 45 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 44-PLCC (16.6x16.6)
AT27C1024-45JC FAQ
1.How can I place an order for AT27C1024-45JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C1024-45JC 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 AT27C1024-45JC reliable?
The price and inventory of AT27C1024-45JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C1024-45JC is usually 5 days.
3.What payment methods are accepted for AT27C1024-45JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C1024-45JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C1024-45JC?
AT27C1024-45JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C1024-45JC 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 AT27C1024-45JC?
For technical support, including AT27C1024-45JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C1024-45JC requirements.
6.How does Aetrix verify that AT27C1024-45JC is sourced from the original manufacturer or authorized distributors?
All AT27C1024-45JC 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 AT27C1024-45JC meets industry standards.
7.What is the process for return or replacement of AT27C1024-45JC?
All AT27C1024-45JC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C1024-45JC, 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 AT27C1024-45JC part is unused and in its original packaging.
Return procedure for AT27C1024-45JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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