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Microchip Technology AT27C2048-55JU-T
- Part No.:
- AT27C2048-55JU-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
AT27C2048-55JU-T.pdf
- Description:
- IC EPROM 2MBIT PARALLEL 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:354
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Product details
Overview
AT27C2048-55JU-T from Microchip Technology (formerly Atmel) is a 2,097,152-bit one-time programmable EPROM organized as 128K × 16, operating at 5V ±10%, with 55ns read access time, 100µA max standby current, 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 mass-storage latency.
For engineers reviewing the AT27C2048-55JU-T datasheet, AT27C2048-55JU-T pinout, AT27C2048-55JU-T application, or AT27C2048-55JU-T equivalent, key selection criteria include x16 bus interface compatibility, industrial temperature range (-40°C to +85°C), rapid 50µs/word programming, integrated product identification code, and dual-line control (CE/OE) for bus contention avoidance in high-speed embedded designs.
Technical Context
The AT27C2048-55JU-T implements a CMOS-based OTP EPROM architecture with separate address decoding (A0–A16), 16-bit bidirectional data outputs (O0–O15), and dedicated program strobe (PGM) and VPP (12.0V ±0.5V) pins for rapid programming. Its two-line enable logic (CE and OE) supports independent chip and output gating, enabling clean bus arbitration in multiprocessor or memory-mapped I/O systems.
It features high-reliability process enhancements including 2,000V HBM ESD protection and 200mA latchup immunity, and integrates an electronic identification code accessible via A9=VH and A0 toggling-used by industry-standard programmers to auto-select correct voltage profiles and algorithms during production programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory density | 2,097,152 bits (128K × 16), enabling full firmware images for mid-complexity 16-/32-bit MCUs without external memory expansion |
| Read access time | 55 ns max - eliminates WAIT states in 5 MHz bus systems and supports real-time boot execution |
| Supply voltage | 5V ±10% - compatible with standard TTL/CMOS logic rails and legacy 5V system power domains |
| Standby current | 100 µA max - enables low-power hold modes in battery-backed or energy-sensitive embedded controllers |
| Programming speed | 50 µs/word typical - reduces production programming cycle time by >90% vs. conventional EPROMs |
| Operating temperature | -40°C to +85°C - qualified for industrial-grade operation in factory automation, instrumentation, and telecom infrastructure |
| VPP programming voltage | 12.0 V ±0.5 V - requires dedicated high-voltage supply rail during programming; not used in read mode |
Pinout & Package
AT27C2048-55JU-T is housed in a 44-lead plastic J-leaded chip carrier (PLCC), JEDEC MS-018 AC compliant, with 16.51 mm × 16.51 mm body size, 1.27 mm lead pitch, and matte tin lead finish. Pins 1 and 23 are designated "don't connect" (DC); both GND pins (pins 8 and 22) must be connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address inputs | 17-bit address bus supporting full 128K-word addressing; A16 is MSB for x16 organization |
| O0–O15 | Data outputs | True bidirectional 16-bit data bus; outputs driven only when CE=VIL and OE=VIL |
| CE | Chip enable | Active-low global device select; controls internal logic activation and VCC current draw |
| OE | Output enable | Active-low output buffer gate; allows multiple devices on same data bus without contention |
| PGM | Program strobe | Active-low signal initiating rapid programming pulse; requires synchronized VPP and timing per spec |
| VPP | Programming voltage | 12.0 V ±0.5 V input required only during programming; must be applied simultaneously with 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 algorithm | 50 µs/word typical programming time with auto-verify loop - cuts production burn-in time and improves yield traceability |
| Integrated product ID code | Manufacturer (001Eh) and device type (00F7h) codes readable via A9=VH and A0 toggle - enables automated programmer validation and BOM version control |
| Two-line control (CE/OE) | Independent chip and output gating - permits interleaved memory access and eliminates bus contention in multi-device systems |
| High-reliability CMOS process | 2,000V ESD protection and 200mA latchup immunity - ensures robustness in manufacturing handling and field-deployed industrial environments |
| CMOS/TTL-compatible I/O | VIL ≤ 0.8 V, VIH ≥ 2.0 V, VOL ≤ 0.4 V, VOH ≥ 2.4 V - interoperable with legacy 5V logic families without level-shifting |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded System Boot ROM |
|---|---|
Use Scenario: Storing ladder logic interpreter and I/O configuration tables in programmable logic controllers deployed in factory-floor environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Nonvolatile boot-time firmware repository accessed directly by the host MCU's address/data bus during cold start and firmware update cycles. Use Value: 55ns access time enables deterministic boot within <100ms; industrial temp rating (-40°C to +85°C) ensures reliability across unconditioned control cabinets. | Use Scenario: Replacing obsolete UV-erasable EPROMs in avionics maintenance test equipment where firmware updates occur infrequently but must be tamper-proof and long-lived. IC Role / Device Role / Timing Role: One-time programmable read-only memory providing immutable, radiation-tolerant program storage for safety-critical diagnostic routines. Use Value: OTP architecture prevents accidental overwrites; 2,000V ESD rating protects against handling damage during field replacement; PLCC package supports socketed field upgrades. |
| Telecom Line Card Bootloader | Medical Imaging Control Module |
Use Scenario: Hosting bootloader and FPGA configuration bitstreams on telecom line cards requiring fast initialization after power-on reset or hot-swap events. IC Role / Device Role / Timing Role: High-speed x16 memory mapped into the host DSP's external memory space for zero-wait-state instruction fetch. Use Value: 128K × 16 organization accommodates complex dual-stage bootloaders; 35mA active current at 5MHz aligns with line card power budgets. | Use Scenario: Storing calibration coefficients and safety-critical startup diagnostics in portable ultrasound control modules subject to strict regulatory lifecycle requirements. IC Role / Device Role / Timing Role: Certified firmware storage element with traceable programming history via integrated ID code, supporting ISO 13485 design verification. Use Value: Product ID code (001Eh/00F7h) enables automated audit trail generation during production programming; 100µA standby current extends battery backup duration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C040-55JU | 512K × 8 organization (4Mb), 55ns access, same PLCC-44 package, 5V supply | Byte-wide interface; requires bus-width adaptation for x16 systems; lower density limits firmware complexity | Select when legacy 8-bit bus architecture or smaller firmware footprint (<512KB) is required |
| AM27C2048-55DC | AMD second-source variant; identical 128K × 16 organization, 55ns, PLCC-44, but uses different ID code and minor timing tolerances | Same functional role and pinout; may require revalidation of programming equipment voltage profiles | Choose for supply chain diversification where AMD qualification is mandated; verify PGM pulse width tolerance (±5%) matches tooling |
Compared with AT27C040-55JU and AM27C2048-55DC, the AT27C2048-55JU-T provides optimal balance of x16 bus efficiency, industrial temperature support, and rapid programming-making it preferred for new 16-/32-bit embedded designs where firmware size exceeds 512KB and deterministic boot timing is critical.
Availability
AT27C2048-55JU-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded system boot ROM, and telecom line card bootloader applications requiring stable component supply, long-term lifecycle assurance, and JEDEC-standard PLCC compatibility.
Supply support for AT27C2048-55JU-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 EPROM family, delivering high-reliability nonvolatile memory solutions for industrial and aerospace applications.
The AT27C EPROM product line was designed specifically for firmware storage in 5V-based microprocessor systems requiring OTP security, fast read performance, and long-term data retention-targeting industrial control, test equipment, and legacy computing platforms.
FAQ
What is the maximum operating temperature range for the AT27C2048-55JU-T?
The AT27C2048-55JU-T is rated for industrial temperature operation from -40°C to +85°C. This range is validated per JEDEC JESD22-A104 and applies to all specified DC and AC parameters, including 55ns access time and 100µA standby current. The device uses high-reliability CMOS process technology to maintain timing and leakage specifications across this full range, making it suitable for deployment in uncontrolled environments such as factory floors or outdoor telecom enclosures.
Does the AT27C2048-55JU-T require a high-voltage supply during normal read operation?
No, the AT27C2048-55JU-T requires only a single 5V ±10% supply (VCC) during normal read operation. The VPP pin (12.0V ±0.5V) is used exclusively during programming and must be disconnected or held at 5V during read mode. Datasheet Section 5.2 explicitly states that VPP may be tied to VCC except during programming, and standby current increases slightly if VCC > VPP - confirming VPP is inactive in read mode. The AT27C2048-55JU-T draws ≤35mA active current and ≤100µA standby current under 5V-only bias.
How many address and data lines does the AT27C2048-55JU-T use?
The AT27C2048-55JU-T uses 17 address lines (A0–A16) to select among its 128K words and 16 bidirectional data lines (O0–O15) for x16 parallel data transfer. This 17-bit address bus supports the full 128K-word capacity (217 = 131,072 addresses), and the x16 organization eliminates the need for byte-lane multiplexing in 16-/32-bit systems. Pin assignments are fixed per the 44-lead PLCC top-view diagram in Figure 3-1 of the datasheet, with A16 as the MSB and O15 as the MSB of the data word.
Can the AT27C2048-55JU-T be used as a direct replacement for the AT27C1024?
Yes, the AT27C2048-55JU-T is documented as a direct upgrade from the AT27C1024 (1Mbit, 64K × 16), sharing identical pinout, 44-lead PLCC package, 5V supply, and x16 interface. Both devices use the same CE/OE dual-control scheme and support rapid programming. However, the AT27C2048-55JU-T doubles the density to 128K × 16 and improves access time to 55ns (vs. 70–90ns for AT27C1024), requiring no PCB changes but enabling larger firmware images and faster boot sequences in the same footprint.
What is the purpose of the integrated product identification code in the AT27C2048-55JU-T?
The integrated product identification code in the AT27C2048-55JU-T provides manufacturer (001Eh) and device type (00F7h) identifiers readable via a specific address sequence: A9 = VH (12.0V) while A0 is toggled between VIL and VIH, with all other address lines held low. This code enables automated programming equipment to validate part authenticity, select correct programming voltages and algorithms, and log traceable programming events - critical for high-volume manufacturing and regulated industries. The AT27C2048-55JU-T implements this feature per Section 5.8 of its datasheet.
AT27C2048-55JU-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:
- 55 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)
AT27C2048-55JU-T FAQ
1.How can I place an order for AT27C2048-55JU-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C2048-55JU-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 AT27C2048-55JU-T reliable?
The price and inventory of AT27C2048-55JU-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C2048-55JU-T is usually 5 days.
3.What payment methods are accepted for AT27C2048-55JU-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C2048-55JU-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C2048-55JU-T?
AT27C2048-55JU-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C2048-55JU-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 AT27C2048-55JU-T?
For technical support, including AT27C2048-55JU-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C2048-55JU-T requirements.
6.How does Aetrix verify that AT27C2048-55JU-T is sourced from the original manufacturer or authorized distributors?
All AT27C2048-55JU-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 AT27C2048-55JU-T meets industry standards.
7.What is the process for return or replacement of AT27C2048-55JU-T?
All AT27C2048-55JU-T units undergo pre-shipment inspection (PSI). If there is an issue with AT27C2048-55JU-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 AT27C2048-55JU-T part is unused and in its original packaging.
Return procedure for AT27C2048-55JU-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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