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Microchip Technology AT27C1024-70JU
- Part No.:
- AT27C1024-70JU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
AT27C1024-70JU.pdf
- Description:
- IC EPROM 1MBIT PARALLEL 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,048
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Product details
Overview
AT27C1024-70JU from Atmel is a 1,048,576-bit (64K × 16) one-time programmable EPROM optimized for high-performance 16-/32-bit microprocessor systems. It delivers 70 ns read access time, operates on a single 5V ±10% supply, and supports industrial temperature range (–40°C to +85°C) in a 44-lead PLCC package.
For engineers reviewing the AT27C1024-70JU datasheet, AT27C1024-70JU pinout, AT27C1024-70JU application, or AT27C1024-70JU equivalent, key selection criteria include verified 70 ns tACC timing, CMOS/TTL-compatible I/O, rapid 100 µs/word programming, dual-line control (CE/OE), and JEDEC-standard PLCC packaging with integrated product identification code.
Technical Context
The AT27C1024-70JU implements a two-line enable architecture (CE and OE) to eliminate bus contention in high-speed systems. Its x16 data bus organization enables direct interfacing with 16-bit processors without byte-lane multiplexing or glue logic.
It features rapid programming with 100 µs/word typical pulse width at VPP = 13.0 V and VCC = 6.5 V, followed by verify-reprogram loops per address. Product identification is accessed via A9 = 12.0 V and A0 toggling, returning manufacturer (001Eh) and device code (00F1h) words.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory capacity | 1,048,576-bit (64K × 16) OTP EPROM - supports firmware storage for 16-bit microprocessors without external data-width conversion |
| Read access time (tACC) | 70 ns max - eliminates WAIT states in 10–14 MHz CPU bus cycles |
| Supply voltage | 5V ±10% - compatible with standard TTL/CMOS logic rails; no auxiliary voltage required for read mode |
| Active current (ICC) | 30 mA max at 5 MHz - enables stable operation under sustained read load without thermal derating |
| Standby current (ISB) | 100 µA max - supports low-power hold states in battery-backed or energy-sensitive systems |
| Programming voltage (VPP) | 13.0 V ±0.25 V - requires dedicated high-voltage programming circuitry; not used during normal read operation |
| Operating temperature | –40°C to +85°C - qualified for industrial environments including factory automation and instrumentation |
Pinout & Package
AT27C1024-70JU is packaged in a 44-lead plastic J-leaded chip carrier (PLCC), JEDEC MS-018 compliant, with 1.27 mm pitch and 17.5 mm × 17.5 mm body size. Both GND pins must be connected for reliable operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address inputs | 16-bit address bus supporting full 64K-word addressing; TTL/CMOS-compatible thresholds |
| O0–O15 | Data outputs | True x16 bidirectional output bus; VOL ≤ 0.4 V at 2.1 mA ensures noise margin in 5V systems |
| CE | Chip enable | Active-low global enable; controls device power state and bus contention avoidance |
| OE | Output enable | Active-low output gate; allows shared bus operation with other peripherals without tri-state conflicts |
| PGM | Program strobe | Active-low programming trigger; initiates 100 µs pulse-driven write cycle when VPP = 13 V |
| VPP | Programming voltage | 13.0 V input for programming only; must be applied simultaneously with or after VCC |
| NC | No connect | Unbonded pins (positions 7, 11, 22, 31, 39); must remain unconnected per design |
Key Features
| Feature | Design Value |
|---|---|
| Rapid programming algorithm | 100 µs/word typical - reduces firmware update time by >90% vs. legacy EPROMs; includes auto-verify loop up to 10 pulses per word |
| Integrated product ID code | Manufacturer (001Eh) and device code (00F1h) accessible via A9 = 12 V and A0 toggle - enables automated programmer recognition and algorithm selection |
| Two-line control (CE/OE) | Independent chip and output enables - eliminates bus contention in multi-peripheral systems and supports burst-read timing optimization |
| ESD and latchup immunity | 2000 V HBM ESD protection and 200 mA latchup immunity - ensures robustness during handling and system-level transient events |
| Green (Pb/halide-free) packaging | RoHS-compliant matte tin lead finish - meets industrial environmental compliance requirements without performance trade-offs |
Applications
| Industrial PLC Firmware Storage | Automotive Engine Control Unit (ECU) Boot ROM |
|---|---|
Use Scenario: Storing fixed boot code and calibration tables in programmable logic controllers deployed in factory-floor environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Nonvolatile firmware storage with deterministic 70 ns read latency, enabling real-time I/O scanning without CPU wait-state insertion. Use Value: Eliminates reliance on slower serial EEPROM or flash; guarantees consistent timing across –40°C to +85°C operating range without refresh or wear leveling overhead. | Use Scenario: Holding immutable engine start-up routines and safety-critical lookup tables in automotive ECUs where reprogramming is infrequent but reliability is paramount. IC Role / Device Role / Timing Role: OTP memory providing tamper-resistant, radiation-tolerant program storage; CE/OE dual-control prevents accidental overwrites during runtime. Use Value: Meets AEC-Q100 stress requirements via 2000 V ESD rating and 200 mA latchup immunity; green packaging satisfies Tier-1 automotive material compliance. |
| Medical Diagnostic Instrument BIOS | Avionics Data Acquisition Module |
Use Scenario: Hosting boot firmware and hardware initialization sequences in FDA-regulated diagnostic equipment requiring long-term data integrity and audit-trail traceability. IC Role / Device Role / Timing Role: One-time programmable ROM ensuring firmware immutability post-certification; integrated ID code enables production-line verification of correct part loading. Use Value: Avoids flash memory wear-out concerns and configuration drift; 100 µs/word programming supports efficient pre-deployment firmware burn-in. | Use Scenario: Storing sensor calibration coefficients and flight-critical initialization vectors in airborne data acquisition modules subject to extended thermal cycling and vibration. IC Role / Device Role / Timing Role: High-reliability OTP EPROM with 64K × 16 organization enabling single-cycle access to 16-bit coefficient banks during ADC sampling setup. Use Value: 70 ns tACC and 15 mA typical active current support deterministic timing in DO-160G Class D environments; PLCC package provides mechanical stability under shock. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C512-70PU | 512K-bit (64K × 8), PDIP-28, 70 ns tACC, same VCC/VPP specs | Requires external byte-wide data bus interface; lacks x16 native support for 16-bit CPUs | Select when system uses 8-bit data path or space-constrained PCB layout favors smaller PDIP |
| MX27C1024-70PC | Same 1M-bit (64K × 16), PDIP-40, 70 ns tACC, but no integrated ID code or rapid programming algorithm | Requires manual algorithm selection in programmers; no A9-based ID verification | Select when cost sensitivity outweighs automated programming benefits and PLCC footprint is unavailable |
Compared with AT27C1024-70JU, AT27C512-70PU offers lower density and narrower bus width, increasing interface complexity for 16-bit systems, while MX27C1024-70PC matches capacity and speed but omits critical production features like ID code and rapid programming-reducing programming yield and traceability in volume manufacturing.
Availability
AT27C1024-70JU is available at Aetrix Electronics and suitable for industrial PLC firmware storage, automotive ECU boot ROM, medical diagnostic instrument BIOS, and avionics data acquisition modules requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for AT27C1024-70JU 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 semiconductor company specializing in microcontrollers, nonvolatile memory, and security ICs, with deep expertise in embedded system components.
The AT27C1024 belongs to Atmel's OTP EPROM product line, designed specifically for high-reliability, low-maintenance firmware storage in industrial and automotive systems where field updates are unnecessary and data integrity is mission-critical.
FAQ
What is the maximum read access time specified for the AT27C1024-70JU?
The AT27C1024-70JU has a maximum read access time (tACC) of 70 ns under standard operating conditions (VCC = 5V ±10%, TA = –40°C to +85°C). This value is guaranteed across the full industrial temperature range and applies when both CE and OE are asserted low. The 70 ns specification enables direct interfacing with 10–14 MHz microprocessor buses without WAIT-state insertion, preserving deterministic timing in real-time control applications.
Does the AT27C1024-70JU require a separate programming voltage during normal operation?
No, the AT27C1024-70JU does not require VPP during normal read operation. VPP = 13.0 V ±0.25 V is needed exclusively during programming; in read mode, only VCC = 5V ±10% is required. The device includes internal logic that isolates VPP from the core array during read cycles, preventing unintended writes. During standby, VPP may be tied to VCC (5 V) with only minor increase in ISB, simplifying power design for systems where programming occurs off-board.
How is the integrated product identification code accessed on the AT27C1024-70JU?
The integrated product identification code on the AT27C1024-70JU is accessed by setting A9 to 12.0 V (VID = 11.5–12.5 V) while holding A1–A15 low, then toggling A0: low (VIL) returns the manufacturer ID (001Eh), and high (VIH) returns the device code (00F1h). This feature is used by industry-standard programmers to auto-detect the AT27C1024-70JU and select correct algorithms and voltages-eliminating manual part selection errors during high-volume production programming.
What are the mandatory decoupling requirements for stable operation of the AT27C1024-70JU?
Each AT27C1024-70JU requires a 0.1 µF high-frequency ceramic capacitor placed between VCC and GND, mounted as close as possible to the device pins. For systems with multiple AT27C1024-70JU devices or large EPROM arrays, a 4.7 µF bulk electrolytic capacitor must also be connected between VCC and GND near the main power entry point. These capacitors suppress transient voltage excursions during CE transitions and stabilize supply rail integrity-preventing nonconformance due to undershoot/overshoot exceeding absolute maximum ratings.
Is the AT27C1024-70JU pin-compatible with earlier Atmel EPROMs such as the AT27C516?
Yes, the AT27C1024-70JU is a direct upgrade from the AT27C516 (512K-bit) in terms of pinout, signal definitions, and control protocol-but not pin-to-pin compatible due to increased pin count (44 vs. 40 leads) and expanded address bus (A0–A15 vs. A0–A14). The AT27C1024-70JU retains identical CE/OE/PGM functionality and x16 data bus structure, allowing straightforward migration in 16-bit systems with board layout revision to accommodate the 44-lead PLCC package.
AT27C1024-70JU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 44-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- 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:
- 70 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)
AT27C1024-70JU FAQ
1.How can I place an order for AT27C1024-70JU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C1024-70JU 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 AT27C1024-70JU reliable?
The price and inventory of AT27C1024-70JU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C1024-70JU is usually 5 days.
3.What payment methods are accepted for AT27C1024-70JU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C1024-70JU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C1024-70JU?
AT27C1024-70JU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C1024-70JU 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 AT27C1024-70JU?
For technical support, including AT27C1024-70JU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C1024-70JU requirements.
6.How does Aetrix verify that AT27C1024-70JU is sourced from the original manufacturer or authorized distributors?
All AT27C1024-70JU 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 AT27C1024-70JU meets industry standards.
7.What is the process for return or replacement of AT27C1024-70JU?
All AT27C1024-70JU units undergo pre-shipment inspection (PSI). If there is an issue with AT27C1024-70JU, 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 AT27C1024-70JU part is unused and in its original packaging.
Return procedure for AT27C1024-70JU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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