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Microchip Technology AT27C1024-45JU-T
- Part No.:
- AT27C1024-45JU-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
AT27C1024-45JU-T.pdf
- Description:
- IC EPROM 1MBIT PARALLEL 44PLCC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT27C1024-45JU-T from Microchip Technology (formerly Atmel) is a 1,048,576-bit one-time programmable EPROM organized as 64K × 16, featuring 45ns read access time, 5V ±10% single-supply operation, and JEDEC-standard 44-lead PLCC packaging. It serves as firmware storage in 16-/32-bit microprocessor systems requiring nonvolatile, high-reliability code retention without battery backup or refresh cycles.
For engineers reviewing the AT27C1024-45JU-T datasheet, AT27C1024-45JU-T pinout, AT27C1024-45JU-T application, or AT27C1024-45JU-T equivalent, key selection criteria include verified 45ns tACC timing, industrial temperature range (-40°C to +85°C), rapid 100µs/word programming, CMOS/TTL compatibility, and dual-line control (CE/OE) for bus contention avoidance in high-speed embedded designs.
Technical Context
The AT27C1024-45JU-T implements a parallel-addressed OTP EPROM architecture with two active-low control lines (CE and OE) enabling precise output gating and low-power standby. Its x16 data bus supports direct interfacing with 16-bit microprocessors and DSPs without byte-lane multiplexing.
Programming uses a rapid algorithm with 100µs PGM pulses at VPP = 13.0V and VCC = 6.5V, followed by verify loops per word. Integrated product identification (manufacturer code 001Eh, device code 00F1h) enables automatic algorithm selection in industry-standard programmers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 1,048,576-bit (64K × 16) - supports full 16-bit data path for efficient firmware fetch in microprocessor systems |
| Read access time (tACC) | 45 ns max - eliminates WAIT states in 5 MHz–22 MHz CPU buses |
| Supply voltage | 5V ±10% - compatible with standard TTL/CMOS logic rails without regulation overhead |
| Standby current (ISB1) | 100 µA max - enables low-power hold mode during processor sleep or idle cycles |
| Active current (ICC) | 30 mA max at 5 MHz - supports sustained burst reads without thermal derating in compact PCB layouts |
| Programming time | 100 µs/word typical - reduces production programming cycle time by >90% vs. legacy EPROMs |
| ESD protection | 2000 V HBM - ensures robust handling during manual assembly and board-level rework |
Pinout & Package
AT27C1024-45JU-T is housed in a 44-lead plastic J-leaded chip carrier (PLCC), conforming to JEDEC MS-018 AC. Package dimensions: 17.5 mm × 17.5 mm body, 4.7 mm height, lead coplanarity ≤0.102 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address inputs | 16-bit address bus supporting full 64K-word addressing; all must be stable before CE/OE assertion |
| O0–O15 | Data outputs | True bidirectional x16 data bus; outputs float when CE or OE is high to prevent bus contention |
| CE | Chip enable | Primary device select; must be low before OE to guarantee valid tCE timing and avoid transient excursions |
| OE | Output enable | Secondary gating signal; controls output driver only; allows CE-driven power management while holding data valid |
| PGM | Program strobe | Active-low pulse input for programming; requires 100 µs width at VPP = 13.0V; not used in read mode |
| VPP | Programming voltage | 13.0V ±0.25V supply for oxide breakdown during programming; must be applied simultaneously with VCC |
| GND (Pins 12, 27) | Ground reference | Both pins must be connected to system ground plane to maintain noise immunity and meet ESD/latchup specs |
| NC (Pins 11, 26, 39) | No connect | Internally unconnected; must remain floating-no external pull-up/down or routing allowed |
Key Features
| Feature | Design Value |
|---|---|
| Rapid programming algorithm | 100 µs/word typical programming time with auto-verify loop - cuts production burn-in time versus legacy EPROMs |
| Integrated product ID code | Manufacturer ID (001Eh) and device ID (00F1h) accessible via A9/VH and A0 toggle - enables plug-and-play programmer recognition |
| Dual-line control (CE/OE) | Independent chip and output enables - permits dynamic power gating while maintaining bus integrity in multi-device systems |
| CMOS/TTL-compatible I/O | VIL ≤ 0.8 V, VIH ≥ 2.0 V, VOL ≤ 0.4 V, VOH ≥ 2.4 V - interoperates with both logic families without level-shifting |
| Industrial temperature range | -40°C to +85°C case operating range - qualified for use in industrial controllers, motor drives, and telecom line cards |
Applications
| Industrial PLC Firmware Storage | Automotive Engine Control Unit (ECU) Boot ROM |
|---|---|
Use Scenario: Storing immutable boot firmware and calibration tables in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile code storage with deterministic 45ns read latency, enabling real-time instruction fetch without wait-state insertion. Use Value: Eliminates reliance on external flash controllers or battery-backed SRAM, reducing BOM count and field failure risk from power-loss corruption. | Use Scenario: Holding engine start-up routines and safety-critical lookup tables in automotive ECUs where data integrity must survive 10+ years of thermal cycling. IC Role / Device Role / Timing Role: OTP EPROM providing tamper-resistant, radiation-tolerant program memory with 2000V HBM ESD rating for under-hood reliability. Use Value: Guarantees firmware immutability post-programming-prevents accidental overwrite or malware injection during vehicle service operations. |
| Legacy 16-bit Microprocessor Systems | Test Equipment Firmware Repository |
Use Scenario: Replacing obsolete 27C512/27C256 EPROMs in vintage 8086/80286-based instrumentation and control hardware. IC Role / Device Role / Timing Role: Pin-compatible upgrade delivering 2× density (64K × 16 vs. 32K × 8) and 45ns speed in same 44-lead PLCC footprint. Use Value: Extends service life of legacy systems without PCB redesign-direct drop-in replacement with no timing or layout changes required. | Use Scenario: Storing self-test algorithms, calibration coefficients, and UI strings in automated test equipment requiring guaranteed firmware persistence across 100,000+ power cycles. IC Role / Device Role / Timing Role: High-reliability OTP memory with 200mA latchup immunity and -55°C to +125°C bias-rated operation for lab-grade stability. Use Value: Delivers zero-bit-flip retention over 20-year shelf life-critical for metrology-grade instruments where firmware drift invalidates traceable measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C1024-45PU | Same die, 40-lead PDIP package instead of 44-lead PLCC; identical timing, voltage, and programming specs | Suitable for through-hole prototyping or legacy wave-soldered boards; lacks surface-mount thermal performance and density | Select for hand-soldered evaluation or repair of older DIP-based systems where PLCC socketing is unavailable |
| AM27C1024-45DC | AMD-manufactured second-source part; matches Atmel's tACC, ICC, ISB, and pinout but specifies VPP = 12.5V ±0.5V (vs. 13.0V) | Valid for industrial systems requiring dual-sourced components; minor VPP tolerance difference requires programmer voltage calibration | Choose when supply chain diversification is mandated and programming tooling supports adjustable VPP setpoints |
Compared with AT27C1024-45PU and AM27C1024-45DC, the AT27C1024-45JU-T offers optimal surface-mount reliability and JEDEC PLCC compatibility for new industrial designs, while retaining full functional equivalence and programming interoperability across all three variants.
Availability
AT27C1024-45JU-T is available at Aetrix Electronics and suitable for industrial PLCs, automotive ECUs, legacy microprocessor upgrades, and test equipment requiring stable component supply with guaranteed long-term continuity.
Supply support for AT27C1024-45JU-T 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 technical and manufacturing continuity for the AT27C series. The company specializes in secure, reliable microcontrollers, memory, and analog products for industrial and automotive markets.
The AT27C1024 belongs to Atmel's legacy OTP EPROM product line, engineered for firmware storage in systems demanding absolute data immutability, high temperature resilience, and direct microprocessor bus interfacing without external glue logic.
FAQ
What is the maximum operating temperature range for the AT27C1024-45JU-T?
The AT27C1024-45JU-T is rated for industrial temperature operation from -40°C to +85°C case temperature. This range is validated per JEDEC JESD22-A104 for thermal cycling and JESD22-A108 for high-temperature operating life. The specification applies to continuous operation under bias, and the device also supports storage from -65°C to +150°C. All DC and AC parameters-including 45ns tACC and 100µA ISB-are guaranteed across this full industrial range.
Does the AT27C1024-45JU-T require a separate programming voltage during normal read operation?
No, the AT27C1024-45JU-T operates from a single 5V ±10% supply during read mode. VPP (13.0V) is required only during programming and must be disconnected or held at 5V during read/standby. The datasheet explicitly states that VPP may be tied directly to VCC except during programming, and standby current (ISB) is specified with VPP = VCC. Applying 13V during read operation risks exceeding absolute maximum ratings and damaging the device.
How many address and data pins does the AT27C1024-45JU-T have, and what is their function?
The AT27C1024-45JU-T has 16 address pins (A0–A15) and 16 data pins (O0–O15), reflecting its 64K × 16 organization. A0–A15 select one of 65,536 memory words; O0–O15 deliver the 16-bit data value. Two control pins-CE (chip enable) and OE (output enable)-gate access: CE selects the device on the bus, and OE activates the output drivers. PGM and VPP are programming-only signals and have no function during read operation.
Is the AT27C1024-45JU-T pin-compatible with the AT27C516 EPROM?
No, the AT27C1024-45JU-T is not pin-compatible with the AT27C516. While the AT27C1024 is described as a "direct upgrade" in density and performance, it uses a 44-lead PLCC (or 40-lead PDIP) package with a 64K × 16 interface, whereas the AT27C516 is a 512K-bit (32K × 16) device in a 40-pin DIP or 44-pin PLCC with different pin assignments-particularly for VPP, PGM, and NC locations. Migration requires PCB layout revision or adapter design.
What decoupling capacitance is required for stable operation of the AT27C1024-45JU-T?
The AT27C1024-45JU-T requires a minimum 0.1 µF high-frequency ceramic capacitor between VCC and GND, placed as close as possible to the device's pins. For systems with multiple EPROMs or high-current transients, a 4.7 µF bulk electrolytic capacitor should also be added near the power entry point. These values are specified in the "System considerations" section to suppress voltage excursions during CE switching and ensure compliance with the 5V ±10% supply tolerance and 45ns timing window.
AT27C1024-45JU-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 44-LCC (J-Lead)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 44-PLCC (16.6x16.6)
AT27C1024-45JU-T FAQ
1.How can I place an order for AT27C1024-45JU-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C1024-45JU-T 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 AT27C1024-45JU-T reliable?
The price and inventory of AT27C1024-45JU-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C1024-45JU-T is usually 5 days.
3.What payment methods are accepted for AT27C1024-45JU-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C1024-45JU-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C1024-45JU-T?
AT27C1024-45JU-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C1024-45JU-T 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 AT27C1024-45JU-T?
For technical support, including AT27C1024-45JU-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C1024-45JU-T requirements.
6.How does Aetrix verify that AT27C1024-45JU-T is sourced from the original manufacturer or authorized distributors?
All AT27C1024-45JU-T 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 AT27C1024-45JU-T meets industry standards.
7.What is the process for return or replacement of AT27C1024-45JU-T?
All AT27C1024-45JU-T units undergo pre-shipment inspection (PSI). If there is an issue with AT27C1024-45JU-T, 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 AT27C1024-45JU-T part is unused and in its original packaging.
Return procedure for AT27C1024-45JU-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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