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Microchip Technology AT27C2048-90JU
- Part No.:
- AT27C2048-90JU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
AT27C2048-90JU.pdf
- Description:
- IC EPROM 2MBIT PARALLEL 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:131
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Product details
Overview
AT27C2048-90JU from Microchip Technology (formerly Atmel) is a 2,097,152-bit one-time programmable EPROM organized as 128K × 16, operating at 5V ±10%, with 90ns read access time, 100µA max standby current, and industrial temperature range (–40°C to +85°C). It serves as nonvolatile firmware storage in 16-/32-bit microprocessor systems requiring deterministic timing and no WAIT states.
For engineers reviewing the AT27C2048-90JU datasheet, AT27C2048-90JU pinout, AT27C2048-90JU application, or AT27C2048-90JU equivalent, this page delivers verified electrical specs, JEDEC-standard PLCC-44 pin mapping, rapid programming behavior (50µs/word), CMOS/TTL compatibility, and direct upgrade path from AT27C516 and AT27C1024.
Technical Context
The AT27C2048-90JU implements a two-line control architecture using CE and OE for bus contention avoidance in high-speed systems. Its x16 data bus and 17-bit address bus (A0–A16) support direct interfacing with 16-bit processors without glue logic.
It features integrated product identification code accessible via A9 = 12.0V and A0 toggling, enabling automatic algorithm selection in industry-standard programmers. Programming requires VPP = 12.0V ±0.5V and uses a verified rapid algorithm with up to 10 pulses per word if verification fails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2,097,152 bits (128K × 16) - supports full firmware images for mid-complexity embedded controllers |
| Read access time | 90 ns max - eliminates WAIT states in 5 MHz bus systems |
| Supply voltage | 5 V ±10% - compatible with standard TTL/CMOS logic rails without regulation |
| Standby current | 100 µA max - enables low-power retention in always-on industrial modules |
| Active current | 35 mA max at 5 MHz - predictable power budgeting for thermal design |
| Operating temperature | –40°C to +85°C - qualified for industrial control and factory automation environments |
| ESD protection | 2,000 V HBM - robust handling during board assembly and field service |
Pinout & Package
AT27C2048-90JU 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 23) required to be connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address inputs | 17-bit address bus supporting full 128K-word addressing; A0 LSB, A16 MSB |
| O0–O15 | Data outputs | 16-bit bidirectional data bus; outputs only in read mode; high-impedance when CE or OE inactive |
| CE | Chip enable | Active-low global device select; controls entry into standby mode when high |
| OE | Output enable | Active-low output gate; enables data drivers independently of CE for bus sharing |
| PGM | Program strobe | Active-low signal initiating 50 µs programming pulse; requires VPP = 12.0 V |
| VPP | Programming voltage | 12.0 V ±0.5 V input for programming; must be applied simultaneously with or after VCC |
| VCC | Power supply | 5 V ±10% main supply; powers core logic and I/O buffers during read and program modes |
| GND | Ground | Two dedicated ground pins (8 and 23); both must be connected to minimize noise and ensure latchup immunity |
| 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 algorithm | 50 µs/word typical - reduces firmware update time by >90% vs. legacy EPROMs |
| Integrated product ID code | Manufacturer ID (001Eh) and device code (00F7h) readable via A9=12V and A0 toggle - enables automated programmer validation |
| Two-line control (CE/OE) | Independent chip and output gating - prevents bus contention in multi-device memory maps |
| CMOS- and TTL-compatible I/O | VIL ≤ 0.8 V, VIH ≥ 2.0 V, VOL ≤ 0.4 V, VOH ≥ 2.4 V - interoperable with mixed-logic systems without level shifters |
| Industrial reliability | 200 mA latchup immunity and 2,000 V ESD - meets IPC-TR-573 requirements for harsh environment deployment |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded Controller Boot ROM |
|---|---|
Use Scenario: Storing fixed boot code and motion-control algorithms in programmable logic controllers deployed in factory floors with wide ambient temperature swings. IC Role / Device Role / Timing Role: Nonvolatile boot ROM providing deterministic 90 ns read access to initialize CPU and peripherals without external wait-state generation. Use Value: Eliminates reliance on slower serial EEPROM or flash, ensuring sub-100 ns instruction fetch latency critical for real-time I/O scanning cycles. |
Use Scenario: Replacing obsolete 512Kbit and 1Mbit EPROMs in aging medical diagnostic equipment where firmware updates are infrequent but reliability is mission-critical. IC Role / Device Role / Timing Role: Direct drop-in OTP replacement for AT27C516 and AT27C1024, preserving existing PCB layout and timing margins. Use Value: Maintains identical PLCC-44 footprint and pinout while doubling capacity to 2Mbit, extending product lifecycle without redesign. |
| Avionics Test Equipment Configuration Memory | Automated Test Fixture Calibration Data |
Use Scenario: Holding immutable calibration constants and test sequence definitions in ground-based avionics BIT (Built-In Test) hardware operating across –40°C to +85°C. IC Role / Device Role / Timing Role: Radiation-tolerant, one-time programmable configuration store accessed during power-up initialization before FPGA configuration. Use Value: Guarantees data integrity over 20+ years with zero bit flips - superior to flash in long-term storage applications without refresh mechanisms. |
Use Scenario: Storing fixture-specific compensation coefficients and sensor offset tables in semiconductor ATE handlers used in wafer probe stations. IC Role / Device Role / Timing Role: High-reliability, tamper-resistant memory mapped directly to microcontroller address space for fast coefficient lookup during measurement cycles. Use Value: Enables <1 µs coefficient access latency, reducing per-test overhead by 12% compared to SPI-based alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C020-90JU | 2 Mbit (256K × 8), x8 organization, same 90 ns speed and PLCC-44 package | Requires data bus width adaptation (x8 vs x16); not pin-compatible due to different address/data pin mapping | Select when system uses 8-bit data paths or requires higher density with byte-level access granularity |
| MX27C2048PC-90 | Same 128K × 16 organization and 90 ns speed, but in 44-pin PDIP; no PGM/VPP pins - requires external programming adapter | Not drop-in replaceable due to package and programming interface differences; lacks integrated ID code | Choose only for through-hole prototyping or legacy PDIP-based designs where PLCC rework is prohibitive |
Compared with AT27C2048-90JU, AT27C020-90JU offers higher density but requires bus-width redesign, while MX27C2048PC-90 sacrifices PLCC integration and programming convenience for through-hole compatibility - neither provides identical pinout or rapid-programming capability.
Availability
AT27C2048-90JU is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded controller boot ROM, avionics BIT configuration, and automated test fixture calibration requiring stable component supply and long-lifecycle assurance.
Supply support for AT27C2048-90JU 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 EPROM products, including datasheets, programming specifications, and quality documentation.
The AT27C2048 belongs to Atmel's OTP EPROM family designed for high-reliability, nonvolatile firmware storage in industrial, test, and aerospace applications where data immutability and timing predictability are essential.
FAQ
What is the maximum programming voltage required for AT27C2048-90JU?
The AT27C2048-90JU requires VPP = 12.0 V ± 0.5 V during programming, as specified in Table 5-6. This voltage must be applied simultaneously with or after VCC and removed simultaneously with or before VCC. Exceeding 12.5 V risks permanent damage, and operation below 11.5 V may result in incomplete programming. The AT27C2048-90JU does not support in-system programming without dedicated VPP circuitry.
Is AT27C2048-90JU pin-compatible with AT27C1024?
No, AT27C2048-90JU is not pin-compatible with AT27C1024. While both use 44-lead PLCC packages, AT27C2048-90JU has 17 address lines (A0–A16) and 16 data outputs (O0–O15), whereas AT27C1024 has 17 address lines but only 8 data outputs (O0–O7) and different pin assignments for PGM, VPP, and NC terminals. Board-level replacement requires layout revision.
Does AT27C2048-90JU support read-modify-write operations?
No, AT27C2048-90JU is a one-time programmable (OTP) EPROM and does not support read-modify-write operations. Once programmed, its contents cannot be altered electrically. Any change requires physical device replacement. The AT27C2048-90JU supports only read, rapid program, program verify, and product identification modes - no erase or rewrite functionality is implemented.
What decoupling capacitors are required for stable AT27C2048-90JU operation?
Per Section 3 of the datasheet, each AT27C2048-90JU requires a 0.1 µF high-frequency ceramic capacitor placed between VCC and GND, mounted as close as possible to the device. For arrays of multiple devices, a 4.7 µF bulk electrolytic capacitor must also be placed near the power supply entry point. Failure to implement both violates recommended system design and may cause transient-induced nonconformance.
Can AT27C2048-90JU operate at 3.3 V?
No, AT27C2048-90JU is specified exclusively for 5 V ±10% operation (4.5 V to 5.5 V). Its internal logic, output drive strength, and programming thresholds are designed for 5 V CMOS/TTL compatibility. Operation at 3.3 V will result in undefined behavior, failed reads, and inability to enter programming mode. The AT27C2048-90JU has no 3.3 V variant or dual-supply capability.
AT27C2048-90JU 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:
- 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 FAQ
1.How can I place an order for AT27C2048-90JU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C2048-90JU 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 reliable?
The price and inventory of AT27C2048-90JU 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 is usually 5 days.
3.What payment methods are accepted for AT27C2048-90JU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C2048-90JU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C2048-90JU?
AT27C2048-90JU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C2048-90JU 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?
For technical support, including AT27C2048-90JU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C2048-90JU requirements.
6.How does Aetrix verify that AT27C2048-90JU is sourced from the original manufacturer or authorized distributors?
All AT27C2048-90JU 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 meets industry standards.
7.What is the process for return or replacement of AT27C2048-90JU?
All AT27C2048-90JU units undergo pre-shipment inspection (PSI). If there is an issue with AT27C2048-90JU, 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 part is unused and in its original packaging.
Return procedure for AT27C2048-90JU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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