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Microchip Technology AT27C2048-70JC
- Part No.:
- AT27C2048-70JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
AT27C2048-70JC.pdf
- Description:
- IC EPROM 2MBIT PARALLEL 44PLCC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT27C2048-70JC from Atmel is a 2-Mbit (128K × 16) one-time programmable EPROM with 55 ns read access time, 5V ±10% supply, and JEDEC-standard 44-lead PLCC packaging. 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 AT27C2048-70JC datasheet, AT27C2048-70JC pinout, AT27C2048-70JC application, or AT27C2048-70JC equivalent, key selection considerations include its -70 speed grade (70 ns max tACC), rapid 50 µs/word programming algorithm, dual-line CE/OE control for bus contention avoidance, and integrated product identification code for automated programming equipment compatibility.
Technical Context
The AT27C2048-70JC implements a CMOS-based OTP EPROM architecture with X/Y decoding, output buffers, and programmable logic for CE/OE/PGM control. Its 128K × 16 organization supports byte-wide or word-wide data paths, and it uses a dedicated VPP pin (12.0 V ±0.5 V) for programming while operating at 5V in read mode.
It features two-line enable control (CE and OE) to isolate outputs during bus sharing, supports both CMOS and TTL input thresholds, and includes built-in ESD protection (2,000 V) and latchup immunity (200 mA). The device provides manufacturer and device identification codes via A9 and A0 toggling under specific VPP conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2,097,152 bits (128K words × 16 bits) - supports full-word parallel access for 16-bit microprocessors. |
| Read Access Time | 70 ns maximum (tACC) - ensures no wait states required in 14 MHz CPU systems. |
| Supply Voltage | 5V ±10% - compatible with standard TTL/CMOS logic rails; VPP = 12.0 V ±0.5 V required only during programming. |
| Active Current | 35 mA max at 5 MHz - enables low-power operation in battery-backed or thermally constrained designs. |
| Standby Current | 100 µA maximum (ISB1, CMOS CE) - reduces quiescent power in idle system states. |
| Programming Speed | 50 µs/word typical (Rapid™ Algorithm) - cuts firmware update time vs. legacy EPROMs by >5×. |
| Operating Temperature | 0°C to +70°C (Commercial) - validated for office, lab, and non-extreme industrial environments. |
Pinout & Package
AT27C2048-70JC is supplied in a 44-lead plastic J-leaded chip carrier (PLCC), JEDEC MS-018 AC compliant, with 1.27 mm pitch and body size 16.7 mm × 16.7 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 supporting full 128K-word addressing; A17 not present - matches physical memory map. |
| O0–O15 | Data Outputs | True 16-bit bidirectional data path; outputs high-impedance when CE or OE inactive. |
| CE | Chip Enable | Active-low primary chip select; controls device activation and power state transition (active/standby). |
| OE | Output Enable | Active-low secondary control; gates output drivers independently of CE to prevent bus contention. |
| PGM | Program Strobe | Active-low pulse input triggering 50 µs programming cycle; requires precise timing per Rapid™ algorithm. |
| VPP | Programming Voltage | 12.0 V ±0.5 V input - must be applied only during programming; disconnected or clamped to 5V otherwise. |
| VCC | Power Supply | 5V ±10% main supply; powers logic and outputs; must be applied before/removed after VPP. |
| GND | Ground | Two dedicated ground pins (pins 22 and 44) - both must be connected to minimize noise and ensure latchup immunity. |
| NC | No Connect | Pins 1 and 23 - physically present but electrically unconnected; must remain floating per datasheet. |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 50 µs/word typical programming time with auto-verify loop - eliminates manual reprogramming and reduces production line cycle time. |
| Integrated Product Identification Code | Manufacturer ID (001Eh) and Device Code (00F7h) readable via A9/VH and A0 toggle - enables automatic algorithm selection in universal programmers. |
| Dual-Line Control (CE + OE) | Independent chip and output enables - allows seamless integration into multiplexed data buses without external bus transceivers. |
| CMOS/TTL Compatibility | Input thresholds meet both CMOS (VIH ≥ 2.0 V) and TTL (VIL ≤ 0.8 V) standards - interoperable with mixed-logic-system designs. |
| High-Reliability Process | 2,000 V HBM ESD rating and 200 mA latchup immunity - suitable for manufacturing handling and field-replaceable modules. |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded Boot ROM |
|---|---|
|
Use Scenario: Storing ladder logic firmware in programmable logic controllers where field updates are infrequent but reliability is critical. IC Role / Device Role / Timing Role: Nonvolatile boot memory providing deterministic 70 ns read access to instruction fetches during cold start and runtime execution. Use Value: Eliminates reliance on slow serial EEPROM or volatile RAM + backup battery; maintains firmware integrity across power cycles and temperature extremes. |
Use Scenario: Replacing obsolete 1M-bit EPROMs (e.g., AT27C1024) in legacy 16-bit embedded systems requiring larger boot code space. IC Role / Device Role / Timing Role: Drop-in upgrade OTP memory delivering 2× capacity with identical 5V interface and pin-compatible footprint in PLCC package. Use Value: Enables feature expansion (e.g., diagnostics, communication stacks) without PCB redesign or controller requalification. |
| Test Equipment Microcode Repository | Avionics Configuration Memory |
|
Use Scenario: Holding calibration tables and test sequence microcode in automated test equipment used in semiconductor final test. IC Role / Device Role / Timing Role: High-speed parallel memory accessed by FPGA-based sequencers requiring sub-100 ns read latency and zero soft errors. Use Value: Provides radiation-tolerant, bit-stable storage immune to SEU - unlike SRAM - with faster access than NAND flash-based alternatives. |
Use Scenario: Storing aircraft subsystem configuration parameters (e.g., sensor scaling, I/O mapping) in certified avionics modules. IC Role / Device Role / Timing Role: Qualified commercial-grade OTP EPROM used in DO-254-compliant hardware where write-once permanence prevents accidental corruption. Use Value: Meets traceability and revision control requirements via integrated ID code; avoids qualification overhead of custom mask ROM. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C020-70PC | 2-Mbit (256K × 8) in 40-lead PDIP; same speed grade (-70), but byte-wide organization and different pinout. | Requires data bus width adaptation (8-bit vs. 16-bit); lacks PGM pin - uses different programming method. | Select only if system uses 8-bit data path and PDIP mounting is preferred; not pin-compatible with AT27C2048-70JC. |
| MX27C2001-70PC | 2-Mbit (256K × 8) OTP EPROM; 70 ns access, 5V supply, but no integrated ID code or Rapid™ programming support. | Compatible with basic EPROM programmers only; no auto-ID capability limits production automation. | Choose for cost-sensitive, low-volume applications where programming flexibility and ID verification are not required. |
Compared with AT27C2048-70JC, AT27C020-70PC offers identical density and speed but requires board-level data bus reconfiguration, while MX27C2001-70PC sacrifices Rapid™ programming and ID code functionality for lower unit cost - making AT27C2048-70JC optimal for automated, high-reliability 16-bit firmware storage.
Availability
AT27C2048-70JC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded boot ROM upgrades, and test equipment microcode repositories requiring stable component supply, long-term lifecycle support, and JEDEC-standard PLCC packaging.
Supply support for AT27C2048-70JC 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 fabless semiconductor company specializing in microcontrollers, nonvolatile memory, and secure authentication ICs.
The AT27C2048 belongs to Atmel's OTP EPROM product line, designed specifically for reliable, high-density firmware storage in industrial, telecom, and embedded systems where reprogrammability is unnecessary but read performance and long-term data retention are critical.
FAQ
What is the maximum read access time specified for AT27C2048-70JC?
The AT27C2048-70JC has a maximum read access time (tACC) of 70 ns under commercial temperature conditions (0°C to +70°C) and 5V ±10% supply. This value is guaranteed across all operating corners and defines the worst-case delay from valid address and CE/OE assertion to stable data on O0–O15. The -70 suffix explicitly denotes this speed grade, distinguishing it from slower variants like -90 or -120.
Does AT27C2048-70JC require a separate programming voltage, and what is its value?
Yes, AT27C2048-70JC requires VPP = 12.0 V ±0.5 V applied to the VPP pin during programming - distinct from its 5V read-mode supply. This voltage must be applied only during the PGM pulse and must follow strict sequencing: VCC must be applied before VPP and removed after VPP. Failure to observe this risks device damage or incomplete programming.
Can AT27C2048-70JC be used as a direct replacement for AT27C1024 in existing designs?
AT27C2048-70JC is positioned as a direct upgrade from AT27C1024 (1M-bit), offering double the density (2M-bit) in the same 44-lead PLCC package. However, it is not pin-to-pin compatible due to additional address lines (A16) and rearranged pin functions. System-level validation is required to confirm signal routing, timing margins, and programming infrastructure compatibility before substitution.
What is the purpose of the Integrated Product Identification Code in AT27C2048-70JC?
The Integrated Product Identification Code in AT27C2048-70JC provides two electronically readable hex identifiers: Manufacturer ID (001Eh) and Device Code (00F7h). Accessed by applying 12 V to A9 and toggling A0, this feature allows universal programmers to auto-detect the device type and load correct algorithms/voltages - eliminating manual setup errors and improving production yield for AT27C2048-70JC programming operations.
How does the dual-line control (CE and OE) of AT27C2048-70JC improve system design?
The dual-line control (CE and OE) in AT27C2048-70JC decouples chip selection from output gating: CE determines device activation and power state, while OE independently enables/disables outputs. This allows AT27C2048-70JC to share a data bus with other devices without contention - for example, holding outputs in high-Z while CE remains active - simplifying bus arbitration logic and reducing external component count in multi-peripheral systems.
AT27C2048-70JC 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:
- 70 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)
AT27C2048-70JC FAQ
1.How can I place an order for AT27C2048-70JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C2048-70JC 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 AT27C2048-70JC reliable?
The price and inventory of AT27C2048-70JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C2048-70JC is usually 5 days.
3.What payment methods are accepted for AT27C2048-70JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C2048-70JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C2048-70JC?
AT27C2048-70JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C2048-70JC 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 AT27C2048-70JC?
For technical support, including AT27C2048-70JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C2048-70JC requirements.
6.How does Aetrix verify that AT27C2048-70JC is sourced from the original manufacturer or authorized distributors?
All AT27C2048-70JC 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 AT27C2048-70JC meets industry standards.
7.What is the process for return or replacement of AT27C2048-70JC?
All AT27C2048-70JC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C2048-70JC, 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 AT27C2048-70JC part is unused and in its original packaging.
Return procedure for AT27C2048-70JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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