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Microchip Technology AT27C2048-90JU-T
- Part No.:
- AT27C2048-90JU-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
AT27C2048-90JU-T.pdf
- Description:
- IC EPROM 2MBIT PARALLEL 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,547
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Product details
Overview
AT27C2048-90JU-T from Microchip Technology (formerly Atmel) is a 2,097,152-bit (128K × 16), one-time programmable EPROM designed for firmware storage in 16-/32-bit microprocessor systems. It operates on a single 5V ±10% supply, delivers 90ns read access time, consumes ≤100µA standby current, and features CMOS/TTL-compatible I/O with industrial temperature range (–40°C to +85°C).
For engineers reviewing the AT27C2048-90JU-T datasheet, AT27C2048-90JU-T pinout, AT27C2048-90JU-T application, or AT27C2048-90JU-T equivalent, this device serves as a direct upgrade path from AT27C516 and AT27C1024 EPROMs in legacy embedded boot memory, FPGA configuration storage, and industrial controller firmware applications requiring OTP reliability and JEDEC-standard PLCC packaging.
Technical Context
The AT27C2048-90JU-T implements a two-line control architecture using CE and OE to eliminate bus contention in high-speed systems. Its x16 organization enables full-word parallel access, supporting efficient instruction fetch in 16-bit data buses without wait states.
It integrates product identification logic accessible via A9 and A0 under VPP = 12.0V, enabling automatic algorithm selection in industry-standard programmers. Rapid programming uses 50µs/word pulses at VCC = 6.5V and VPP = 13.0V, with verification loops up to 10 pulses per word.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2,097,152 bits (128K × 16) - supports full-word firmware images for 16-bit microcontrollers without byte-level addressing overhead |
| Read access time | 90 ns max - eliminates WAIT states in 10 MHz CPU bus cycles with tACC and tCE both ≤90 ns |
| Supply voltage | 5 V ±10% - compatible with standard TTL/CMOS logic rails; no auxiliary voltage required for read mode |
| Standby current | 100 µA max - enables low-power retention in always-on industrial controllers during idle periods |
| Active current | 35 mA max at 5 MHz - predictable power budgeting for system-level thermal design |
| Operating temperature | –40°C to +85°C - qualified for industrial-grade embedded environments including factory automation and motor drives |
| ESD protection | 2,000 V HBM - robust handling during manual PCB assembly and field service replacement |
Pinout & Package
AT27C2048-90JU-T is housed in a 44-lead plastic J-leaded chip carrier (PLCC), JEDEC MS-018 AC compliant, with pins 1 and 23 designated "don't connect" and both GND pins (pins 8 and 22) requiring connection for stable operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address inputs | 17-bit address bus supporting full 128K-word decoding; A16 enables access beyond 64K boundary |
| O0–O15 | Data outputs | True parallel 16-bit output bus; VOH ≥2.4V at –400µA ensures TTL compatibility |
| CE | Chip enable | Active-low global enable; controls device activation and power state transitions between active/standby |
| OE | Output enable | Active-low output gating; allows shared bus operation without contention when CE remains asserted |
| PGM | Program strobe | Active-low programming trigger; requires VPP = 12.0V ±0.5V and precise 47.5–52.5 µs pulse width |
| VPP | Programming voltage | 12.0V ±0.5V input for OTP programming; must be applied simultaneously with or after VCC |
| NC / DC | No connect / Don't connect | Pins 1 and 23 are internally unconnected; must remain floating per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Rapid programming | 50 µs/word typical - reduces firmware update time by >90% vs. legacy EPROMs; verified per internal loop up to 10 pulses |
| Integrated ID code | Manufacturer ID (001Eh) and device code (00F7h) readable at A9 = 12.0V - enables auto-detection in universal programmers |
| Two-line control | CE + OE independent gating - permits flexible bus arbitration in multi-device systems without external logic |
| High-reliability CMOS | 200 mA latchup immunity - prevents destructive current paths during transient overvoltage events |
| Low-power standby | ≤100 µA ISB1 (CMOS) - extends battery-backed operation in maintenance-mode industrial gateways |
Applications
| Industrial PLC Firmware Storage | Legacy 16-bit Microcontroller Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic and I/O mapping tables in programmable logic controllers deployed in factory-floor environments. IC Role / Device Role / Timing Role: Non-volatile boot memory providing deterministic 90ns read access to initialization code upon power-up. Use Value: Eliminates reliance on slow serial EEPROM or external flash; ensures sub-100ns instruction fetch timing critical for real-time scan cycle execution. |
Use Scenario: Hosting BIOS and peripheral drivers in aging 16-bit embedded systems such as CNC motion controllers and test equipment. IC Role / Device Role / Timing Role: x16 parallel EPROM serving as primary program memory mapped into CPU address space. Use Value: Direct drop-in replacement for AT27C1024 with doubled density; maintains identical pinout and timing interface for zero-hardware-change upgrades. |
| FPGA Configuration Memory | Automated Test Equipment (ATE) Pattern Storage |
Use Scenario: Holding static configuration bitstreams for SRAM-based FPGAs in production test fixtures where reprogramming is infrequent. IC Role / Device Role / Timing Role: OTP storage element delivering parallel configuration words synchronized to FPGA INIT clock. Use Value: Immune to accidental overwrite or radiation-induced corruption; supports fast parallel loading without serial protocol overhead. |
Use Scenario: Storing fixed digital stimulus/response patterns used in semiconductor wafer sorters and board-level functional testers. IC Role / Device Role / Timing Role: High-reliability pattern memory accessed via dedicated test controller address bus. Use Value: 2,000V ESD rating ensures robustness during repeated socket insertion/removal in high-volume manufacturing environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C2048-55JU | 55 ns access time (vs. 90 ns); otherwise identical pinout, voltage, and OTP functionality | Suitable only where sub-60 ns timing is required - e.g., 16 MHz+ CPU buses with zero wait-state constraints | Select only if system timing margin analysis confirms need for faster tACC; higher cost and lower availability than -90 variant |
| MX27C2048PC-90 | Same 128K×16 OTP EPROM, 90 ns, 5V, PLCC-44; manufactured by Macronix; JEDEC-compatible but non-Atmel ID code | Valid for firmware storage where Atmel-specific ID reading is not required in programming flow | Use when cross-supplier sourcing is needed; verify programmer compatibility with Macronix ID codes before deployment |
Compared with AT27C2048-55JU, the AT27C2048-90JU-T trades 35 ns of access speed for broader timing margin and higher stock availability; versus MX27C2048PC-90, it retains Atmel's integrated ID code for seamless integration with legacy Atmel-programmer ecosystems.
Availability
AT27C2048-90JU-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy 16-bit microcontroller boot ROM, and FPGA configuration memory requiring stable component supply across extended production lifecycles.
Supply support for AT27C2048-90JU-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 continues to manufacture and support legacy Atmel EPROMs including the AT27C2048 family. The company specializes in secure, reliable, and long-lifecycle semiconductor solutions for industrial and automotive markets.
The AT27C2048 series was developed as a high-density, OTP EPROM solution targeting firmware storage in resource-constrained embedded systems where EEPROM endurance or flash write complexity were unacceptable - emphasizing data integrity, timing predictability, and JEDEC-standard compatibility.
FAQ
What is the programming voltage requirement for AT27C2048-90JU-T?
The AT27C2048-90JU-T requires VPP = 12.0 V ± 0.5 V during programming, applied simultaneously with or after VCC. This voltage is mandatory for oxide breakdown programming of the floating-gate cells. Programming is not possible at standard 5 V; attempting to program without correct VPP will result in incomplete or failed writes. The AT27C2048-90JU-T datasheet specifies VID (A9 identification voltage) at 11.5–12.5 V, confirming tight regulation requirements.
Can AT27C2048-90JU-T operate with a 3.3 V supply?
No, the AT27C2048-90JU-T is specified exclusively for 5 V ± 10% operation. Its input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V), output drive strength (VOL ≤ 0.4 V at 2.1 mA), and internal logic are designed for 5 V TTL/CMOS compatibility. Applying 3.3 V will cause undefined behavior, insufficient noise margin, and failure to meet tACC/tOE timing specs. The AT27C2048-90JU-T does not support dual-supply or mixed-voltage interfacing.
Is AT27C2048-90JU-T pin-compatible with AT27C1024?
Yes, the AT27C2048-90JU-T is pin-compatible with AT27C1024 in the same 44-lead PLCC package. Both share identical pin functions (A0–A15, O0–O15, CE, OE, PGM, VPP, VCC, GND), though AT27C2048-90JU-T adds A16 and removes one NC pin to accommodate its doubled density. System-level compatibility requires verifying address decoding logic supports A16 assertion and that firmware image fits the larger memory map.
Does AT27C2048-90JU-T support read-modify-write operations?
No, the AT27C2048-90JU-T is a one-time programmable (OTP) EPROM and does not support in-system modification. Once programmed, data cannot be erased or rewritten. Read-modify-write sequences require external logic and temporary RAM buffering - the AT27C2048-90JU-T provides only true read-only access post-programming. Its rapid programming algorithm applies only during initial factory or lab programming.
What decoupling capacitors are required for stable AT27C2048-90JU-T operation?
The AT27C2048-90JU-T requires a 0.1 µF ceramic capacitor placed between VCC and GND, mounted as close as possible to pins 44 and 8/22. For arrays with multiple devices, a 4.7 µF bulk electrolytic capacitor must also be added near the power entry point. These values are mandated in the datasheet to suppress transients during CE switching and ensure VCC stability within ±10% during active read cycles - failure to implement them risks timing violations and data corruption in the AT27C2048-90JU-T.
AT27C2048-90JU-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:
- 2Mbit
- Memory Organization:
- 128K x 16
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- -
- Access Time:
- 90 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)
AT27C2048-90JU-T FAQ
1.How can I place an order for AT27C2048-90JU-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C2048-90JU-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 AT27C2048-90JU-T reliable?
The price and inventory of AT27C2048-90JU-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C2048-90JU-T is usually 5 days.
3.What payment methods are accepted for AT27C2048-90JU-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C2048-90JU-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C2048-90JU-T?
AT27C2048-90JU-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C2048-90JU-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 AT27C2048-90JU-T?
For technical support, including AT27C2048-90JU-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C2048-90JU-T requirements.
6.How does Aetrix verify that AT27C2048-90JU-T is sourced from the original manufacturer or authorized distributors?
All AT27C2048-90JU-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 AT27C2048-90JU-T meets industry standards.
7.What is the process for return or replacement of AT27C2048-90JU-T?
All AT27C2048-90JU-T units undergo pre-shipment inspection (PSI). If there is an issue with AT27C2048-90JU-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 AT27C2048-90JU-T part is unused and in its original packaging.
Return procedure for AT27C2048-90JU-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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