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Microchip Technology AT27C2048-55JU
- Part No.:
- AT27C2048-55JU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
AT27C2048-55JU.pdf
- Description:
- IC EPROM 2MBIT PARALLEL 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,540
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Product details
Overview
AT27C2048-55JU from Atmel is a 2,097,152-bit (128K × 16) one-time programmable EPROM optimized for high-speed read access in 16-/32-bit microprocessor systems. It delivers 55 ns address-to-output delay, operates from a single 5V ±10% supply, and draws ≤100 µA standby current. Its PLCC-44 package supports industrial temperature range (–40°C to +85°C) and integrates product identification code for automated programming.
For engineers reviewing the AT27C2048-55JU datasheet, AT27C2048-55JU pinout, AT27C2048-55JU application, or AT27C2048-55JU equivalent, key selection criteria include verified 55 ns read timing, JEDEC-standard PLCC-44 mechanical compatibility, rapid 50 µs/word programming, CMOS/TTL I/O compatibility, and industrial-grade ESD (2,000 V) and latchup (200 mA) immunity.
Technical Context
The AT27C2048-55JU implements a two-line control architecture with CE and OE inputs to eliminate bus contention in high-speed systems. Its x16 organization enables full-word parallel access, reducing instruction fetch latency in embedded controllers and firmware storage applications.
It features integrated product identification logic that uses A9 at 12.0 V and toggled A0 to output manufacturer (001Eh) and device (00F7h) codes - enabling automatic algorithm selection in industry-standard programmers. Programming requires VPP = 12.0 V ±0.5 V and VCC = 6.5 V ±0.25 V during rapid pulse mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory capacity | 2,097,152 bits (128K × 16), supporting full-word firmware image storage for 16-bit CPUs without byte-wide access overhead |
| Read access time | 55 ns max (tACC), eliminating WAIT states in 5 MHz microprocessor buses |
| Supply voltage | 5 V ±10%, compatible with standard TTL/CMOS logic rails without regulation |
| Standby current | 100 µA max (ISB1), enabling low-power retention in battery-backed or intermittent-read systems |
| Active current | 35 mA max at 5 MHz, limiting thermal load in dense memory arrays |
| Programming speed | 50 µs/word typical, reducing production burn-in time versus legacy EPROMs |
| Operating temperature | –40°C to +85°C case, validated for industrial control and automotive under-hood auxiliary modules |
Pinout & Package
AT27C2048-55JU is housed in a 44-lead plastic J-leaded chip carrier (PLCC-44), JEDEC MS-018 AC compliant, with lead finish matte tin and coplanarity ≤0.102 mm. Pins 1 and 23 are NC (no connect); both GND pins (pins 8 and 23) must be connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address inputs | 17-bit address bus supporting full 128K-word decoding; A16 enables upper half of memory map |
| O0–O15 | Data outputs | 16-bit bidirectional data bus; outputs driven only when CE = OE = VIL |
| CE | Chip enable | Active-low global enable; controls power state transition between active (≤35 mA) and standby (≤100 µA) |
| OE | Output enable | Active-low output gate; allows shared bus operation by disabling outputs while CE remains asserted |
| PGM | Program strobe | Active-low programming trigger; initiates 50 µs pulse write cycle when VPP = 12.0 V |
| VPP | Programming voltage | 12.0 V ±0.5 V input required only during programming; must be applied simultaneously with or after VCC |
| VCC | Power supply | 5 V ±10% main supply; provides 6.5 V during programming via external regulator or step-up circuit |
| GND | Ground | Two dedicated ground pins (8, 23) required for noise suppression and current return path integrity |
Key Features
| Feature | Design Value |
|---|---|
| Rapid programming algorithm | 50 µs/word typical write cycle with auto-verify loop, reducing firmware update time by >60% vs. conventional EPROMs |
| Integrated product ID code | Electronic manufacturer (001Eh) and device (00F7h) identification via A9/A0, enabling plug-and-play programmer compatibility |
| Two-line control (CE/OE) | Eliminates bus contention in multi-device systems by decoupling chip select from output gating |
| High-reliability process | 2,000 V HBM ESD protection and 200 mA latchup immunity ensure robustness in industrial handling and board-level stress |
| CMOS/TTL I/O compatibility | Input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V) and output drive (VOL ≤ 0.4 V, VOH ≥ 2.4 V) meet both logic families without level shifters |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded Controller Boot ROM |
|---|---|
|
Use Scenario: Storing fixed ladder logic and I/O configuration in programmable logic controllers operating in factory environments with wide temperature swings. IC Role / Device Role / Timing Role: Non-volatile boot ROM providing deterministic 55 ns instruction fetch timing to ARM7-based CPU cores. Use Value: Eliminates WAIT states in 5 MHz bus cycles, ensuring real-time scan cycle consistency across –40°C to +85°C ambient. |
Use Scenario: Replacing obsolete 1 Mbit EPROMs in medical infusion pump controllers requiring certified, unalterable firmware. IC Role / Device Role / Timing Role: OTP firmware repository with tamper-resistant programming; no risk of accidental overwrite during field service. Use Value: Rapid 50 µs/word programming enables efficient batch firmware loading during final test, reducing manufacturing cycle time. |
| Automotive Diagnostic Module Memory | Test Equipment Calibration Data Storage |
|
Use Scenario: Holding OBD-II protocol stacks and vehicle-specific calibration tables in aftermarket diagnostic tools deployed in under-hood conditions. IC Role / Device Role / Timing Role: Industrial-temperature EPROM interfacing directly with 16-bit microcontrollers via multiplexed address/data buses. Use Value: 2,000 V ESD rating prevents field failures during technician handling; 100 µA standby current extends battery life in portable units. |
Use Scenario: Storing traceable calibration coefficients and sensor linearization tables in benchtop multimeters and oscilloscopes. IC Role / Device Role / Timing Role: Secure, one-time-programmable memory preventing unauthorized modification of metrology-critical data. Use Value: Integrated product ID code allows automated verification of correct firmware version during calibration lab audits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C1024-90JU | 1 Mbit (64K × 16), 90 ns access, same PLCC-44 package and pinout | Limited to smaller firmware images; insufficient for full 128K-word boot code | Select when legacy system design constrains memory footprint and timing budget allows 90 ns latency |
| MX27C2001-55PL | 2 Mbit (128K × 16), 55 ns access, PDIP-40 package, different pin assignment | Requires PCB redesign due to DIP-40 vs PLCC-44 footprint and incompatible CE/OE timing margins | Choose only if through-hole assembly is mandated and board re-spin is feasible |
Compared with AT27C2048-55JU, AT27C1024-90JU offers lower density and slower timing but identical package and interface; MX27C2001-55PL matches capacity and speed but demands mechanical and layout changes due to DIP-40 packaging and non-identical control timing.
Availability
AT27C2048-55JU is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded controller boot ROM, and automotive diagnostic module memory requiring stable component supply across extended lifecycle programs.
Supply support for AT27C2048-55JU 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, non-volatile memory, and secure authentication ICs for industrial, automotive, and consumer applications.
The AT27C2048-55JU belongs to Atmel's OTP EPROM product line, designed specifically for high-reliability, cost-sensitive firmware storage where reprogrammability is unnecessary and long-term data retention is critical.
FAQ
What is the maximum read access time specification for the AT27C2048-55JU?
The AT27C2048-55JU has a guaranteed maximum read access time (tACC) of 55 ns under industrial temperature conditions (–40°C to +85°C) and 5 V ±10% supply. This value is measured from address valid to valid data output with CE and OE both asserted low, and ensures zero WAIT-state operation on 5 MHz microprocessor buses. The -55 suffix explicitly denotes this timing grade.
Does the AT27C2048-55JU require a separate programming voltage supply?
Yes, the AT27C2048-55JU requires VPP = 12.0 V ±0.5 V during programming, supplied independently from VCC. VPP must be applied simultaneously with or after VCC and removed simultaneously with or before VCC. A 0.1 µF capacitor is mandatory between VPP and GND to suppress transients. During read operation, VPP may be tied to VCC.
How does the integrated product identification code function in the AT27C2048-55JU?
The AT27C2048-55JU implements an electronic ID code accessible via A9 = 12.0 V and toggling A0 while holding A1–A16 low. This outputs manufacturer ID (001Eh) and device ID (00F7h) on O15–O0, allowing automated programmers to validate part authenticity and select correct algorithms. No external hardware or software configuration is needed.
Can the AT27C2048-55JU be used as a direct replacement for the AT27C1024 in existing designs?
The AT27C2048-55JU is documented by Atmel as a direct upgrade from the AT27C1024, sharing identical PLCC-44 packaging, pinout, and interface signaling. However, its 128K × 16 organization doubles capacity and requires updated address decoding logic to utilize the full A16 bit - making it backward-compatible only if the original design leaves A16 unconnected or unused.
What are the power supply decoupling requirements for stable operation of the AT27C2048-55JU?
Each AT27C2048-55JU requires a 0.1 µF high-frequency ceramic capacitor placed between VCC and GND, mounted as close as possible to the device. For boards with multiple EPROMs, a 4.7 µF bulk electrolytic capacitor must also be placed near the power entry point. These prevent transient excursions during CE switching that could exceed absolute maximum ratings.
AT27C2048-55JU 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:
- 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 FAQ
1.How can I place an order for AT27C2048-55JU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C2048-55JU 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 reliable?
The price and inventory of AT27C2048-55JU 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 is usually 5 days.
3.What payment methods are accepted for AT27C2048-55JU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C2048-55JU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C2048-55JU?
AT27C2048-55JU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C2048-55JU 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?
For technical support, including AT27C2048-55JU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C2048-55JU requirements.
6.How does Aetrix verify that AT27C2048-55JU is sourced from the original manufacturer or authorized distributors?
All AT27C2048-55JU 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 meets industry standards.
7.What is the process for return or replacement of AT27C2048-55JU?
All AT27C2048-55JU units undergo pre-shipment inspection (PSI). If there is an issue with AT27C2048-55JU, 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 part is unused and in its original packaging.
Return procedure for AT27C2048-55JU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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