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Microchip Technology AT27C2048-90JC
- Part No.:
- AT27C2048-90JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
AT27C2048-90JC.pdf
- Description:
- IC EPROM 2MBIT PARALLEL 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,496
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Product details
Overview
AT27C2048-90JC from Atmel is a 2-Mbit (128K × 16) one-time programmable EPROM with 90 ns read access time, 5V ±10% supply, and JEDEC-standard 44-lead PLCC package. It serves as nonvolatile program storage in 16/32-bit microprocessor systems, enabling fast firmware access without wait states in industrial control and embedded boot applications.
For engineers reviewing the AT27C2048-90JC datasheet, AT27C2048-90JC pinout, AT27C2048-90JC application, or AT27C2048-90JC equivalent, key selection considerations include its 90 ns tACC timing, dual-line CE/OE control for bus contention avoidance, Rapid™ programming at 50 µs/word, and compatibility with legacy AT27C516/AT27C1024 designs.
Technical Context
The AT27C2048-90JC implements a CMOS-based OTP memory array organized as 128K words × 16 bits, supporting full parallel access via 17 address lines (A0–A16) and 16 bidirectional data outputs (O0–O15). Its two-line enable architecture (CE and OE) decouples chip selection from output gating to minimize bus contention during high-speed reads.
Programming uses a dedicated VPP = 13.0 V supply and PGM strobe with a verified 50 µs pulse width; product identification is accessed via A9 = 12.0 V and A0 toggling to read manufacturer (001Eh) and device code (00F7h) words. Standby current is specified at ≤100 µA with CE high and VPP = VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2,097,152 bits (128K × 16) - supports full-word fetches for 16-bit processors without byte-lane splitting. |
| Read Access Time (tACC) | 90 ns max - enables direct interface to 10 MHz bus cycles without wait-state insertion. |
| Supply Voltage | 5V ±10% - compatible with standard TTL/CMOS logic rails; no auxiliary voltage required for read mode. |
| Active Current (ICC) | 35 mA max at 5 MHz - low enough for multi-device memory subsystems without excessive thermal load. |
| Standby Current (ISB) | 100 µA max - allows power-sensitive systems to retain firmware state during sleep modes. |
| Programming Speed | 50 µs/word typical - reduces production programming time versus older EPROMs with 100+ µs/word algorithms. |
| ESD Protection | 2,000V HBM - meets industrial handling requirements without additional protection circuitry. |
Pinout & Package
AT27C2048-90JC is supplied in a 44-lead plastic J-leaded chip carrier (PLCC), JEDEC MS-018 AC compliant, with body size 16.7 mm × 16.7 mm × 3.5 mm. Pin 1 is marked by a corner notch; pins 1 and 23 are No Connect (NC).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus for full 128K-word addressing; TTL/CMOS compatible thresholds. |
| O0–O15 | Data Outputs | 16-bit bidirectional data bus; active-low OE controls tristate; outputs drive 2.1 mA low / -400 µA high. |
| CE | Chip Enable | Active-low global enable; must be stable before address setup to meet tAS timing. |
| OE | Output Enable | Active-low output gate; independent of CE to support interleaved read cycles and reduce bus contention. |
| PGM | Program Strobe | Active-low pulse input for programming; requires precise 47.5–52.5 µs width at VPP = 13.0 V. |
| VPP | Programming Voltage | 13.0 V ±0.25 V supply input; must be applied after VCC and removed before VCC per sequencing rules. |
| VCC | Power Supply | 5V ±10% main supply; powers core logic and I/O buffers; requires local 0.1 µF ceramic decoupling. |
| GND | Ground | Two dedicated ground pins (pins 22 and 44); both must be connected to minimize noise and ensure latchup immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 50 µs/word typical programming time with automatic verify-reprogram loop up to 10 pulses per word. |
| Integrated Product Identification Code | Electronic ID (001Eh manufacturer, 00F7h device) accessible via A9 = 12.0 V and A0 toggle - enables auto-algorithm selection in production programmers. |
| Dual-Line Control (CE + OE) | Independent chip select and output enable allow pipelined reads and eliminate bus contention in shared-memory systems. |
| JEDEC-Standard Packages | 44-lead PLCC (44J) footprint matches industry-standard socketing and rework tooling; pin-compatible with AT27C2048-90JI/PC/VC variants. |
| High Reliability Design | 200 mA latchup immunity and 2,000 V ESD protection ensure robust operation in industrial environments with noisy power rails. |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded Boot ROM |
|---|---|
Use Scenario: Storing ladder logic and I/O configuration in programmable logic controllers operating in factory-floor environments (-40°C to +85°C). IC Role / Device Role / Timing Role: Nonvolatile boot memory providing deterministic 90 ns read access to initialize CPU and peripherals at power-up. Use Value: Eliminates reliance on slow serial EEPROM or external flash; ensures sub-100 ns instruction fetch latency for real-time control loops. |
Use Scenario: Replacing obsolete 1M-bit EPROMs in legacy medical instrumentation and test equipment requiring field-upgradable firmware. IC Role / Device Role / Timing Role: Drop-in upgrade path for AT27C1024-based designs, leveraging same 16-bit bus width and JEDEC PLCC footprint. Use Value: Doubles storage capacity without PCB redesign; retains identical timing margins and power delivery requirements. |
| Automotive Engine Control Unit (ECU) Calibration Data | Avionics System Bootloader Memory |
Use Scenario: Holding engine calibration maps and sensor compensation tables in automotive ECUs certified to AEC-Q100 stress standards. IC Role / Device Role / Timing Role: OTP storage for immutable calibration data; accessed during cold-start initialization before RAM initialization. Use Value: Immune to radiation-induced bit flips; withstands 200 mA latchup events common in vehicle electrical transients. |
Use Scenario: Storing secure bootloader code in airborne computing modules where firmware integrity and tamper resistance are critical. IC Role / Device Role / Timing Role: First-stage read-only memory executed directly from address zero upon processor reset. Use Value: Integrated product ID prevents counterfeit substitution; 2,000 V ESD rating supports handling in static-prone avionics assembly environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C2048-90JI | Same die and timing, but rated for -40°C to +85°C industrial temperature range; higher ISB (1 mA max vs. 100 µA). | Required for extended-temperature deployments; not suitable for commercial-grade cost-sensitive designs. | Select AT27C2048-90JI when ambient operating temperature exceeds 70°C or system qualification mandates industrial temp grade. |
| AT27C2048-90VC | Identical electrical specs, but packaged in 40-lead VSOP (10 mm × 14 mm); smaller footprint, surface-mount only. | Used where board space is constrained and reflow soldering is preferred over through-hole or PLCC sockets. | Choose AT27C2048-90VC for compact, high-density layouts; avoid if socket-based field replacement or manual rework is needed. |
Compared with AT27C2048-90JC, the -90JI variant trades lower standby current for wider temperature tolerance, while the -90VC offers space savings at the cost of socket compatibility and thermal mass - making the -90JC optimal for commercial-grade, socketed, space-tolerant industrial control applications.
Availability
AT27C2048-90JC is available at Aetrix Electronics and suitable for industrial control systems, legacy embedded boot applications, and avionics bootloader implementations requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for AT27C2048-90JC 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 designer specializing in microcontrollers, nonvolatile memory, and secure authentication ICs for industrial, automotive, and consumer applications.
The AT27C2048 belongs to Atmel's OTP EPROM product line, engineered for reliable, high-density firmware storage in systems where code immutability, fast parallel access, and JEDEC-standard packaging are essential.
FAQ
What is the maximum read access time specified for the AT27C2048-90JC?
The AT27C2048-90JC has a maximum read access time (tACC) of 90 ns under commercial temperature conditions (0°C to 70°C) with VCC = 5V ±10% and CL = 100 pF. This value is guaranteed across all operating corners and reflects the delay from valid address and CE/OE assertion to stable data on O0–O15 outputs. The "-90" suffix in the part number explicitly denotes this 90 ns speed grade.
Does the AT27C2048-90JC require a programming voltage during normal read operation?
No, the AT27C2048-90JC operates from a single 5V ±10% supply (VCC) during read mode; VPP is only required during programming and verification cycles. In read mode, VPP may be tied to VCC, but doing so increases standby current slightly. The AT27C2048-90JC datasheet specifies that VPP must be applied after VCC and removed before VCC to prevent latchup or data corruption.
How many address and data lines does the AT27C2048-90JC support?
The AT27C2048-90JC supports 17 address inputs (A0–A16) to access its full 128K-word capacity and 16 bidirectional data outputs (O0–O15) aligned to its 16-bit organization. This native x16 interface eliminates the need for external byte-lane multiplexing or glue logic when interfacing with 16-bit microprocessors such as the Motorola 68000 or Intel 8086 derivatives.
Is the AT27C2048-90JC pin-compatible with earlier Atmel EPROMs like the AT27C1024?
Yes, the AT27C2048-90JC is a direct upgrade from the AT27C1024 (1M-bit) and AT27C516 (512K-bit) EPROMs in the same PLCC package - sharing identical pinout, voltage levels, and control signal definitions (CE, OE, PGM, VPP). However, it adds A16 and extends the address range; existing designs must route A16 and verify timing margins for the longer propagation path.
What decoupling capacitance is recommended for stable operation of the AT27C2048-90JC?
Atmel specifies a minimum 0.1 µF high-frequency ceramic capacitor between VCC and GND, placed as close as possible to the AT27C2048-90JC package pins. For systems with multiple AT27C2048-90JC devices or high-current transients, a 4.7 µF bulk electrolytic capacitor should also be added near the power entry point to stabilize the VCC rail and suppress low-frequency ripple.
AT27C2048-90JC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 44-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 44-PLCC (16.6x16.6)
AT27C2048-90JC FAQ
1.How can I place an order for AT27C2048-90JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C2048-90JC 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 AT27C2048-90JC reliable?
The price and inventory of AT27C2048-90JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C2048-90JC is usually 5 days.
3.What payment methods are accepted for AT27C2048-90JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C2048-90JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C2048-90JC?
AT27C2048-90JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C2048-90JC 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 AT27C2048-90JC?
For technical support, including AT27C2048-90JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C2048-90JC requirements.
6.How does Aetrix verify that AT27C2048-90JC is sourced from the original manufacturer or authorized distributors?
All AT27C2048-90JC 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 AT27C2048-90JC meets industry standards.
7.What is the process for return or replacement of AT27C2048-90JC?
All AT27C2048-90JC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C2048-90JC, 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 AT27C2048-90JC part is unused and in its original packaging.
Return procedure for AT27C2048-90JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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