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Microchip Technology AT27C1024-55JC
- Part No.:
- AT27C1024-55JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
AT27C1024-55JC.pdf
- Description:
- IC EPROM 1MBIT PARALLEL 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,318
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Product details
Overview
AT27C1024-55JC from Microchip Technology (formerly Atmel) is a 1-Mbit one-time programmable EPROM organized as 64K × 16 bits, operating at 5V ±10%, with 55 ns maximum access time, 30 mA active current, and 100 µA max standby current. It serves as nonvolatile firmware storage in legacy 16-bit microprocessor systems requiring reliable boot code retention without refresh or write cycles.
For engineers reviewing the AT27C1024-55JC datasheet, AT27C1024-55JC pinout, AT27C1024-55JC application, or AT27C1024-55JC equivalent, key selection criteria include JEDEC-standard 40-lead PDIP packaging, dual-line control (CE/OE), VPP-programmable architecture, and compatibility with Rapid™ programming at 100 µs/word.
Technical Context
The AT27C1024-55JC implements a CMOS OTP EPROM architecture with address decoding for A0–A15, bidirectional 16-bit data outputs O0–O15, and dedicated high-voltage programming control via PGM and VPP pins. Its two-line enable scheme (CE and OE) enables bus contention avoidance in high-speed parallel memory interfaces.
It supports five distinct operating modes-Read, Output Disable, Standby, Rapid Program, and PGM Verify-each defined by specific logic levels on CE, OE, and PGM, with VPP = 12.0 V ±0.5 V required only during programming. Product identification is accessible via A9 voltage-level selection and A0 toggling to read manufacturer and device codes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1,048,576 bits (64K × 16) - supports full 16-bit data bus interface without byte-lane splitting |
| Access Time | 55 ns max - eliminates WAIT states in 16–20 MHz CPU systems using standard timing margins |
| VCC Supply | 5 V ±10% - compatible with legacy TTL/CMOS logic rails; no auxiliary voltage required for read operation |
| Standby Current | 100 µA max - enables low-power hold mode during processor idle without external power gating |
| Programming Voltage | VPP = 12.0 V ±0.5 V - requires external HV supply; not used in normal read operation |
| Input Compatibility | CMOS and TTL level inputs - interoperable with both 5 V logic families without level-shifting |
| ESD Protection | 2000 V HBM - ensures robustness during manual handling and board insertion |
Pinout & Package
AT27C1024-55JC is packaged in a 40-lead, 0.600-inch wide plastic dual in-line package (PDIP), JEDEC MS-011 AC compliant, with 2×20 lead arrangement and pin 1 identified by notch or dot. Both GND pins (pins 12 and 29) must be connected for stable operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus interface; fully decoded to select one of 65,536 words |
| O0–O15 | Data Outputs | True 16-bit bidirectional output bus; high-impedance when OE or CE inactive |
| CE | Chip Enable | Active-low global chip select; controls device activation and standby entry |
| OE | Output Enable | Active-low output gate; enables data drivers independently of CE for bus sharing |
| PGM | Program Strobe | Active-low pulse input that initiates 100 µs programming cycle when VPP is asserted |
| VPP | Programming Voltage | 12 V input required only during programming; must be applied after and removed before VCC |
| NC | No Connect | Pins 21 and 38 are unconnected; must remain floating or tied to GND per layout guidelines |
| VCC / GND | Power Rails | Single 5 V supply; dual GND pins (12, 29) reduce ground bounce in high-speed reads |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming | 100 µs/word typical - reduces firmware update time by >90% vs. legacy EPROM algorithms |
| Integrated ID Code | Manufacturer (001Eh) and Device (00F1h) codes readable via A9/A0 - enables automated programmer validation |
| Two-Line Control | Independent CE and OE enables - allows memory-mapped I/O and shared bus arbitration without glue logic |
| JEDEC Standard Packages | 40-lead PDIP (40P6), 44-lead PLCC (44J), and 40-lead VSOP (40V) - ensures socket and footprint compatibility across platforms |
| Temperature Ranges | Commercial (0°C to 70°C), Industrial (−40°C to 85°C), and Automotive (−40°C to 125°C) variants - supports deployment across embedded tiers |
Applications
| Industrial PLC Firmware Storage | Legacy Test Equipment Boot ROM |
|---|---|
Use Scenario: Fixed-function programmable logic controllers require immutable startup firmware stored in nonvolatile memory with zero runtime write risk. IC Role / Device Role / Timing Role: AT27C1024-55JC acts as boot ROM, delivering 16-bit instruction words to Z8000 or 80C186 derivatives at ≤18 MHz clock rates. Use Value: 55 ns access time ensures single-cycle fetches; OTP nature prevents accidental corruption during field operation or EMI events. | Use Scenario: Automated test systems use factory-programmed calibration and self-test routines stored in ROM prior to deployment. IC Role / Device Role / Timing Role: AT27C1024-55JC provides read-only execution space for diagnostic firmware accessed via ISA or VMEbus peripherals. Use Value: Dual GND pins and 200 mA latchup immunity sustain reliability in noisy lab environments with frequent hot-plug events. |
| Military Avionics Configuration Memory | Medical Imaging System BIOS |
Use Scenario: Flight-critical avionics modules store hardware configuration tables and safety-critical initialization sequences in tamper-resistant ROM. IC Role / Device Role / Timing Role: AT27C1024-55JC supplies static configuration data to FPGA configuration controllers and MIL-STD-1553 interface ICs. Use Value: −40°C to 85°C industrial grade variant (AT27C1024-55JI) meets DO-254 environmental stress screening requirements. | Use Scenario: CT/MRI scanner mainboards rely on verified boot code to initialize radiation-safe power sequencing and sensor calibration. IC Role / Device Role / Timing Role: AT27C1024-55JC holds BIOS image executed by x86-compatible embedded controller during cold start. Use Value: 2000 V HBM ESD rating protects against electrostatic discharge during service technician handling in shielded rooms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C1024-55JI | Same die, industrial temperature range (−40°C to 85°C); identical pinout, timing, and programming characteristics | Required for extended-temperature deployments where ambient exceeds 70°C | Select when operating environment exceeds commercial grade limits; no PCB changes needed |
| AM27C1024-55DC | AMD second-source version; same 40-pin PDIP, 55 ns access, 5 V operation, but lacks Integrated Product Identification Code | Compatible in read-mode systems; incompatible with programmers relying on ID-code auto-detection | Use only in cost-sensitive legacy replacements where ID-code verification is not implemented |
Compared with AT27C1024-55JC, the AT27C1024-55JI extends thermal capability without altering timing or layout, while AM27C1024-55DC offers functional equivalence but removes programmable ID features critical for automated production programming.
Availability
AT27C1024-55JC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy test equipment boot ROM, military avionics configuration memory, and medical imaging system BIOS requiring stable component supply across long-life product cycles.
Supply support for AT27C1024-55JC 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 documentation, programming tools, and long-term supply assurance.
The AT27C1024 product line was designed for high-reliability, nonvolatile firmware storage in 16-bit embedded systems where EEPROM endurance or Flash write latency were unacceptable trade-offs.
FAQ
What is the maximum access time specified for the AT27C1024-55JC?
The AT27C1024-55JC has a maximum address-to-output delay (tACC) of 55 ns under commercial temperature conditions (0°C to 70°C) with VCC = 5 V ±10%. This value is guaranteed across all operating voltages and load conditions defined in the datasheet, enabling direct integration into 16–20 MHz microprocessor buses without wait-state insertion. The AT27C1024-55JC achieves this performance using optimized CMOS decoding and output driver design.
Does the AT27C1024-55JC require a high-voltage supply during normal read operation?
No, the AT27C1024-55JC operates exclusively from a single 5 V ±10% supply (VCC) during read mode. The VPP pin (12.0 V ±0.5 V) is required only during programming and must be disconnected or held at VCC during read or standby. Applying VPP during read may cause excessive current draw or undefined behavior. The AT27C1024-55JC's design isolates programming circuitry to prevent interference with read functionality.
How many ground connections does the AT27C1024-55JC require, and why?
The AT27C1024-55JC requires two dedicated ground connections: Pin 12 (GND) and Pin 29 (GND). Both must be connected to the system ground plane to ensure signal integrity, minimize ground bounce during high-speed output transitions, and meet ESD/latchup immunity specifications. Separating ground paths for core logic and output drivers reduces noise coupling and supports stable 55 ns access timing. This dual-GND requirement is explicitly stated in the AT27C1024-55JC datasheet.
Can the AT27C1024-55JC be used as a drop-in replacement for the AT27C516?
Yes, the AT27C1024-55JC is documented as a direct upgrade from the 512 Kbit AT27C516, sharing identical pinout, control signaling (CE/OE/PGM), voltage requirements, and programming methodology. Its 64K × 16 organization doubles capacity while maintaining backward compatibility in existing 40-pin PDIP sockets. However, firmware must be recompiled for the expanded address space, and the AT27C1024-55JC requires updated programming algorithms to handle the larger word count.
What is the purpose of the Integrated Product Identification Code in the AT27C1024-55JC?
The Integrated Product Identification Code in the AT27C1024-55JC provides two electronically readable 16-bit words: Manufacturer ID (001Eh) and Device Code (00F1h), accessed by setting A9 to 12.0 V and toggling A0. This feature enables automatic device recognition in programming equipment, ensuring correct algorithm selection, voltage application, and verification sequence. It eliminates manual part-number entry errors and supports mixed-batch programming workflows for the AT27C1024-55JC and related family members.
AT27C1024-55JC 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:
- 55 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)
AT27C1024-55JC FAQ
1.How can I place an order for AT27C1024-55JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C1024-55JC 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 AT27C1024-55JC reliable?
The price and inventory of AT27C1024-55JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C1024-55JC is usually 5 days.
3.What payment methods are accepted for AT27C1024-55JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C1024-55JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C1024-55JC?
AT27C1024-55JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C1024-55JC 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 AT27C1024-55JC?
For technical support, including AT27C1024-55JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C1024-55JC requirements.
6.How does Aetrix verify that AT27C1024-55JC is sourced from the original manufacturer or authorized distributors?
All AT27C1024-55JC 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 AT27C1024-55JC meets industry standards.
7.What is the process for return or replacement of AT27C1024-55JC?
All AT27C1024-55JC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C1024-55JC, 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 AT27C1024-55JC part is unused and in its original packaging.
Return procedure for AT27C1024-55JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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