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Microchip Technology AT27C2048-12JC
- Part No.:
- AT27C2048-12JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
AT27C2048-12JC.pdf
- Description:
- IC EPROM 2MBIT PARALLEL 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,177
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Product details
Overview
AT27C2048-12JC from Atmel is a 2-Mbit (128K × 16) one-time programmable EPROM with 120 ns maximum read access time, 5V ±10% supply, and JEDEC-standard 44-lead PLCC packaging. It delivers TTL/CMOS-compatible I/O, rapid programming at 50 µs/word, and supports high-performance 16-/32-bit microprocessor systems in commercial temperature range (0°C to 70°C).
For engineers reviewing the AT27C2048-12JC datasheet, AT27C2048-12JC pinout, AT27C2048-12JC application, or AT27C2048-12JC equivalent, key selection criteria include read timing (tACC = 120 ns), standby current (≤100 µA), VPP programming voltage (12.0 V), dual-line control (CE/OE), and OTP reliability for firmware storage in legacy embedded systems.
Technical Context
The AT27C2048-12JC implements a 128K-word × 16-bit memory array with X/Y decoding architecture and output buffers controlled by CE and OE. Its two-line enable logic eliminates bus contention in high-speed parallel buses, and the integrated product identification code enables automatic algorithm selection in industry-standard programmers via A9/VH and A0 toggling.
It operates in five distinct modes-Read, Output Disable, Standby, Rapid Program, and PGM Verify-each defined by specific CE/OE/PGM voltage combinations and VPP states. Programming requires 13.0 V VPP and 6.5 V VCC, with a verified 50 µs ±5% pulse width and up to 10 retries per word during verification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2,097,152 bits (128K × 16) - supports full 16-bit data bus without byte-lane splitting |
| Read Access Time (tACC) | 120 ns max - eliminates WAIT states in 8-MHz Z80 or 10-MHz 80286 systems |
| VCC Supply Voltage | 5.0 V ±10% - compatible with standard TTL/CMOS logic rails and legacy power domains |
| Standby Current (ISB1) | 100 µA max - enables low-power hold mode in battery-backed or intermittent-read applications |
| VPP Programming Voltage | 12.0 V ±0.5 V - requires dedicated programming supply; not derived from VCC |
| Programming Speed | 50 µs/word typical - reduces firmware burn time by >90% vs. older EPROMs like AT27C1024 |
| ESD Protection | 2,000 V HBM - ensures robustness during manual handling and board-level assembly |
Pinout & Package
AT27C2048-12JC uses a 44-lead plastic J-leaded chip carrier (PLCC) package per JEDEC MS-018 AC, with pins 1 and 23 designated as No Connect (NC). Both GND pins must be connected for stable operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting full 128K-word addressing; A0 least significant |
| O0–O15 | Data Outputs | True 16-bit bidirectional data path; no internal latching or direction control |
| CE | Chip Enable | Active-low primary device select; controls power state transition between active/standby |
| OE | Output Enable | Active-low output gate; enables high-impedance float when deasserted to prevent bus contention |
| PGM | Program Strobe | Active-low pulse input triggering single-word programming cycle under VPP = 12 V |
| VPP | Programming Voltage | 12 V input required only during programming; must be applied after VCC and removed before VCC |
| VCC | Power Supply | 5 V main supply for read/standby; supplies core logic and I/O buffers |
| 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 auto-verify loop - cuts firmware update cycles from minutes to seconds |
| Integrated Product ID Code | Manufacturer ID (001Eh) and Device Code (00F7h) readable via A9=12 V and A0 toggle - enables plug-and-play programmer recognition |
| Two-Line Control (CE/OE) | Independent chip and output enables - allows interleaved memory access and clean bus release without external logic |
| High-Reliability CMOS Process | 200 mA latchup immunity and 2 kV ESD protection - meets industrial handling and long-term field reliability requirements |
| Direct Upgrade Path | Pin- and software-compatible replacement for AT27C516 (512K-bit) and AT27C1024 (1M-bit) - simplifies memory capacity scaling |
Applications
| Industrial PLC Firmware Storage | Legacy Test Equipment Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic and I/O configuration in DIN-rail mounted programmable logic controllers operating continuously in factory environments. IC Role / Device Role / Timing Role: Nonvolatile boot ROM providing deterministic 120 ns read access to initialization code on power-up. Use Value: Eliminates reliance on slow serial EEPROM or volatile RAM + battery backup; withstands 85°C ambient and repeated thermal cycling. |
Use Scenario: Holding calibration routines and self-test firmware in automated circuit board testers used in electronics manufacturing. IC Role / Device Role / Timing Role: OTP EPROM serving as trusted, tamper-resistant execution source for diagnostic sequences. Use Value: Prevents accidental or malicious firmware modification; supports direct 16-bit bus interface to test controller CPU without glue logic. |
| Military Avionics Bootloader | Medical Imaging System BIOS |
Use Scenario: Storing secure bootloader code in airborne mission computers where reprogramming is prohibited after field deployment. IC Role / Device Role / Timing Role: Immutable first-stage boot device accessed within 120 ns of reset assertion. Use Value: Meets MIL-STD-883 Class B screening requirements; 2 kV ESD rating protects against static discharge in maintenance workflows. |
Use Scenario: Hosting system initialization firmware in ultrasound and MRI front-end controllers requiring certified firmware integrity. IC Role / Device Role / Timing Role: Read-only memory mapped at CPU reset vector, delivering deterministic startup behavior. Use Value: Supports FDA Class II device traceability via integrated ID code; 100 µA standby current extends uptime in battery-assisted portable units. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C2048-12PC | Same die, 40-lead PDIP package (600 mil width); no NC pins; requires through-hole PCB layout | Used where socket-based prototyping or legacy through-hole assembly is mandated | Select for breadboard evaluation or repair of vintage equipment with DIP sockets |
| AT27C2048-12VC | Same die, 40-lead VSOP (10 mm × 14 mm); thinner profile; GND pins at corners instead of center | Preferred for space-constrained industrial modules needing surface-mount compatibility | Select when board real estate is limited and reflow soldering is available |
Compared with AT27C2048-12PC and AT27C2048-12VC, the AT27C2048-12JC offers superior thermal dissipation via PLCC's exposed metal pad and standardized J-lead solder joint geometry-critical for long-life deployments in sealed enclosures where airflow is restricted.
Availability
AT27C2048-12JC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy test equipment boot ROM, military avionics bootloader, and medical imaging system BIOS requiring stable component supply across extended production lifecycles.
Supply support for AT27C2048-12JC 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) designed high-reliability nonvolatile memory and microcontroller solutions for industrial, automotive, and defense applications before its 2016 acquisition.
The AT27C2048 belongs to Atmel's 27C-series OTP EPROM family, engineered specifically for firmware storage in systems where code immutability, deterministic timing, and long-term data retention (>10 years) are mandatory design requirements.
FAQ
What is the maximum operating temperature range for the AT27C2048-12JC?
The AT27C2048-12JC is rated for commercial temperature operation from 0°C to 70°C. It is not qualified for industrial (-40°C to +85°C) use-those variants carry the "I" suffix (e.g., AT27C2048-12JI). The -12JC variant uses the same silicon die but is screened and tested exclusively to commercial specifications, including lower standby current limits and reduced AC timing margins.
Does the AT27C2048-12JC require a separate VPP programming supply?
Yes, the AT27C2048-12JC requires a dedicated 12.0 V ±0.5 V VPP supply during programming-this voltage cannot be derived from VCC. The datasheet mandates that VPP be applied after VCC and removed before VCC to prevent latchup. During normal read operation, VPP may be tied to VCC, but doing so increases standby current slightly due to internal leakage paths.
Can the AT27C2048-12JC be used as a drop-in replacement for AT27C1024 in existing designs?
The AT27C2048-12JC is a direct upgrade from AT27C1024 with identical pinout, voltage levels, and control signaling-but it doubles the memory depth (128K × 16 vs. 64K × 16) and adds A16. To use it as a replacement, A16 must be grounded or decoded externally; unused address lines do not float. No PCB changes are needed if A16 is properly terminated.
What decoupling capacitors are required for stable operation of the AT27C2048-12JC?
The AT27C2048-12JC requires two decoupling capacitors: a 0.1 µF ceramic capacitor placed between VCC and GND as close as possible to the device's pins, and a 4.7 µF bulk electrolytic capacitor near the power entry point of any EPROM array. These suppress transient excursions caused by CE switching and stabilize VCC during rapid output transitions, preventing non-conformance per Absolute Maximum Ratings.
How is the Integrated Product Identification Code read from the AT27C2048-12JC?
The Integrated Product Identification Code in the AT27C2048-12JC is read by setting A9 to 12.0 V (VID = 11.5–12.5 V), holding A1–A16 low, and toggling A0: low selects the Manufacturer ID (001Eh), high selects the Device Code (00F7h). Both codes appear on O15–O0 simultaneously during a standard read cycle with CE and OE asserted, enabling automatic detection by programming hardware.
AT27C2048-12JC 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:
- 120 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)
AT27C2048-12JC FAQ
1.How can I place an order for AT27C2048-12JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C2048-12JC 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 AT27C2048-12JC reliable?
The price and inventory of AT27C2048-12JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C2048-12JC is usually 5 days.
3.What payment methods are accepted for AT27C2048-12JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C2048-12JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C2048-12JC?
AT27C2048-12JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C2048-12JC 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 AT27C2048-12JC?
For technical support, including AT27C2048-12JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C2048-12JC requirements.
6.How does Aetrix verify that AT27C2048-12JC is sourced from the original manufacturer or authorized distributors?
All AT27C2048-12JC 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 AT27C2048-12JC meets industry standards.
7.What is the process for return or replacement of AT27C2048-12JC?
All AT27C2048-12JC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C2048-12JC, 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 AT27C2048-12JC part is unused and in its original packaging.
Return procedure for AT27C2048-12JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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