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Microchip Technology AT27C1024-90JC
- Part No.:
- AT27C1024-90JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
AT27C1024-90JC.pdf
- Description:
- IC EPROM 1MBIT PARALLEL 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,365
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Product details
Overview
AT27C1024-90JC from Atmel is a 1-Mbit (64K × 16) one-time programmable EPROM with 90 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 supports commercial temperature range (0°C to 70°C).
For engineers reviewing the AT27C1024-90JC datasheet, AT27C1024-90JC pinout, AT27C1024-90JC application, or AT27C1024-90JC equivalent, this OTP EPROM delivers deterministic timing, CMOS/TTL compatibility, integrated product identification, and JEDEC-standard PDIP packaging - critical for legacy firmware storage, boot ROM, and industrial controller memory upgrades.
Technical Context
The AT27C1024-90JC implements a 64K-word × 16-bit OTP memory array with address decoding for A0–A15 and bidirectional data I/O on O0–O15. Its two-line enable architecture (CE active-low, OE active-low) enables precise output gating without bus contention during high-speed read cycles.
Programming requires VPP = 13.0 V ±0.25 V and VCC = 6.5 V ±0.25 V, with a 100 µs PGM pulse width and verification loop per word. Product identification uses A9 voltage sensing (12.0 V ±0.5 V) and A0 toggling to select manufacturer or device code words.
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 | 90 ns max - eliminates WAIT states in 10 MHz Z80/8086-class systems |
| Supply Voltage | 5 V ±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 compact enclosures |
| Standby Current | 100 µA max (CMOS CE) - enables low-power hold states in battery-backed controllers |
| Programming Voltage | VPP = 13.0 V ±0.25 V - requires dedicated HV programming circuitry; not compatible with standard 5 V-only programmers |
| Operating Temperature | 0°C to 70°C - validated for commercial-grade embedded systems with passive cooling |
Pinout & Package
AT27C1024-90JC is supplied 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; fully decoded to select one of 65,536 words |
| O0–O15 | Data Outputs | 16-bit parallel data bus; high-impedance when CE or OE is inactive |
| CE | Chip Enable | Active-low global chip select; disables outputs and reduces ICC to standby level when high |
| OE | Output Enable | Active-low output gate; allows shared bus operation without disabling CE |
| PGM | Program Strobe | Active-low pulse input (100 µs width) initiating write cycle under VPP = 13 V |
| VPP | Programming Voltage | 13.0 V input during programming only; must be applied after VCC and removed before VCC |
| VCC | Power Supply | +5 V supply for read and programming modes; decoupling capacitor (0.1 µF ceramic) required at pin |
| GND | Ground | Two dedicated ground pins (12 and 28); both must be connected to minimize noise and ensure ESD immunity |
| NC | No Connect | Pin 21 is unconnected; must remain floating - no pull-up/down or routing |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/word typical programming time with auto-verify loop - reduces production burn-in time by >70% vs. legacy EPROMs |
| Integrated Product Identification Code | Manufacturer ID (001Eh) and Device Code (00F1h) readable via A9/VH and A0 toggle - enables automated programmer validation |
| 2000 V ESD Protection | HBM-rated protection on all pins - eliminates need for external TVS diodes in handling-sensitive industrial assembly lines |
| CMOS/TTL Compatibility | VIL ≤ 0.8 V, VIH ≥ 2.0 V, VOL ≤ 0.4 V, VOH ≥ 2.4 V - interoperable with both logic families without level shifters |
| Two-Line Control Architecture | Independent CE and OE enables simultaneous memory mapping and output gating - essential for multi-master bus arbitration |
Applications
| Industrial PLC Firmware Storage | Legacy Microprocessor Boot ROM |
|---|---|
Use Scenario: Fixed-function programmable logic controllers require immutable, field-replaceable firmware images stored in nonvolatile memory with guaranteed retention over 10+ years. IC Role / Device Role / Timing Role: Primary boot-time instruction store accessed at power-on reset; provides deterministic 90 ns read latency to meet hard real-time scan cycle deadlines. Use Value: Eliminates reliance on slow serial EEPROM or unreliable battery-backed SRAM; supports direct execution from address space without shadowing. |
Use Scenario: Vintage 16-bit systems (e.g., Intel 80286, Motorola 68020) use parallel EPROMs for BIOS or monitor ROM, requiring pin-compatible drop-in replacement with identical timing. IC Role / Device Role / Timing Role: Static memory-mapped code storage mapped to upper address space; operates as synchronous peripheral with no wait-state insertion. Use Value: Direct upgrade path from AT27C516 (512K); same 40-pin PDIP footprint and CE/OE protocol simplifies board-level retrofitting. |
| Automotive Instrument Cluster Calibration Data | Medical Device Configuration Memory |
Use Scenario: Analog/digital instrument clusters store calibrated sensor offsets and display lookup tables that must survive 100,000+ power cycles and -40°C to +85°C thermal cycling. IC Role / Device Role / Timing Role: Nonvolatile configuration store accessed during startup sequence; data integrity verified via checksum before UI initialization. Use Value: OTP architecture prevents accidental overwrite; 200 mA latchup immunity ensures robustness against automotive load-dump transients. |
Use Scenario: Class II medical devices (e.g., infusion pumps) require FDA-auditable, tamper-proof memory for safety-critical calibration constants and regulatory version identifiers. IC Role / Device Role / Timing Role: Read-only parameter repository accessed during self-test; immune to electromagnetic interference per IEC 60601-1-2 Ed. 4. Use Value: Integrated product ID code enables traceability to manufacturing lot; 2000 V HBM ESD rating meets EN 61000-4-2 Level 4 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C1024-90PC | Same die, identical timing and programming specs, but in 40-lead PDIP with wider 0.600" body (vs. JC's 0.300" narrow body) | Requires PCB footprint change; incompatible with space-constrained sockets designed for JC variant | Select only if existing layout accommodates 0.600" DIP width and mechanical clearance permits |
| AT27C1024-90VI | Same functionality but rated for -40°C to +85°C industrial range; higher standby current (1 mA vs. 100 µA) | Valid for extended temperature deployments; unsuitable where low-power standby is mandatory | Choose for outdoor or factory-floor equipment; avoid in battery-powered or thermally constrained designs |
Compared with AT27C1024-90PC and AT27C1024-90VI, the AT27C1024-90JC offers optimal fit for commercial-grade, space-limited PDIP layouts requiring minimal standby current - making it the preferred choice for cost-sensitive, volume-manufactured embedded controllers.
Availability
AT27C1024-90JC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy microprocessor boot ROM, and medical device configuration memory requiring stable component supply across multi-year production cycles.
Supply support for AT27C1024-90JC 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, pin-compatible OTP EPROM replacements for legacy 512K and 1M systems - emphasizing reliability, rapid programming, and JEDEC-standard packaging for long-lifecycle embedded deployments.
FAQ
What is the maximum read access time specified for the AT27C1024-90JC?
The AT27C1024-90JC has a maximum read access time of 90 ns under standard conditions (VCC = 5 V ±10%, TA = 0°C to 70°C). This value is guaranteed across the commercial temperature range and applies to both CE- and OE-controlled access paths, ensuring predictable timing in synchronous bus interfaces without added wait states.
Does the AT27C1024-90JC require a high-voltage supply during normal operation?
No - the AT27C1024-90JC operates from a single 5 V ±10% supply during read mode. The VPP pin (13.0 V ±0.25 V) is required only during programming and must be disconnected or held at VCC during normal read operation. Applying VPP during read may increase standby current and risk noncompliance with absolute maximum ratings.
Can the AT27C1024-90JC be used as a direct replacement for the AT27C516 EPROM?
Yes - the AT27C1024-90JC is explicitly designed as a direct upgrade from the AT27C516 (512K × 8). It maintains identical pinout, control signaling (CE/OE), and 5 V operation while doubling density to 64K × 16. No PCB changes are needed, though software must accommodate the wider 16-bit data bus and expanded address space.
What decoupling capacitors are required for stable operation of the AT27C1024-90JC?
The AT27C1024-90JC requires a 0.1 µF ceramic capacitor placed between VCC and GND, mounted as close as possible to the device pins. For systems with multiple EPROMs, a 4.7 µF bulk electrolytic capacitor should also be added near the power entry point to suppress array-level supply droop during simultaneous output transitions.
How is the product identification code read from the AT27C1024-90JC?
The AT27C1024-90JC identification code is accessed by setting A9 to 12.0 V ±0.5 V (VID), holding A1–A15 low, and toggling A0: low selects the Manufacturer ID (001Eh), high selects the Device Code (00F1h). Outputs O15–O0 reflect the 16-bit code, readable during standard read mode with CE and OE asserted.
AT27C1024-90JC 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:
- 90 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)
AT27C1024-90JC FAQ
1.How can I place an order for AT27C1024-90JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C1024-90JC 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 AT27C1024-90JC reliable?
The price and inventory of AT27C1024-90JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C1024-90JC is usually 5 days.
3.What payment methods are accepted for AT27C1024-90JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C1024-90JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C1024-90JC?
AT27C1024-90JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C1024-90JC 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 AT27C1024-90JC?
For technical support, including AT27C1024-90JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C1024-90JC requirements.
6.How does Aetrix verify that AT27C1024-90JC is sourced from the original manufacturer or authorized distributors?
All AT27C1024-90JC 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 AT27C1024-90JC meets industry standards.
7.What is the process for return or replacement of AT27C1024-90JC?
All AT27C1024-90JC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C1024-90JC, 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 AT27C1024-90JC part is unused and in its original packaging.
Return procedure for AT27C1024-90JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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