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Microchip Technology AT27C2048-12PI
- Part No.:
- AT27C2048-12PI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 40-DIP (0.600", 15.24mm)
- Datasheet:
-
AT27C2048-12PI.pdf
- Description:
- IC EPROM 2MBIT PARALLEL 40DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,295
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Product details
Overview
AT27C2048-12PI from Atmel is a 2-Mbit (128K × 16) one-time programmable EPROM with 55 ns read access time, 5V ±10% supply, and JEDEC-standard 40-lead PDIP package. It delivers TTL/CMOS-compatible I/O, rapid 50 µs/word programming, and operates across -40°C to +85°C for industrial firmware storage in 16/32-bit microprocessor systems.
For engineers reviewing the AT27C2048-12PI datasheet, AT27C2048-12PI pinout, AT27C2048-12PI application, or AT27C2048-12PI equivalent, key selection criteria include its 128K × 16 organization, dual-line CE/OE control for bus contention avoidance, 100 µA max standby current, and compatibility with legacy AT27C516/AT27C1024 designs.
Technical Context
The AT27C2048-12PI implements a standard OTP EPROM architecture with X/Y decoding, output buffers, and integrated product identification logic. Its two-line enable scheme (CE and OE) enables high-speed read operation without WAIT states, while the Rapid™ programming algorithm uses precise 50 µs VPP pulses at 13.0 V for reliable word-level programming.
It supports both commercial and industrial temperature ranges, features 2,000V ESD protection and 200 mA latchup immunity, and requires external decoupling: 0.1 µF ceramic capacitor per device plus 4.7 µF bulk capacitance for EPROM arrays to suppress VCC transients during CE toggling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2,097,152 bits (128K × 16), enabling full firmware image storage for 16-bit MCUs without bank switching |
| Read Access Time | 120 ns max (tACC), allowing direct interface to 8 MHz Z80 or 10 MHz 80286 without wait-state insertion |
| VCC Supply | 5V ±10%, compatible with standard TTL logic rails and eliminating need for dedicated voltage regulators |
| Standby Current | 100 µA max (ISB1), reducing system power budget in low-power hold modes |
| Active Current | 35 mA max at 5 MHz, supporting sustained burst reads in real-time control loops |
| Programming Voltage | VPP = 13.0 V ±0.25 V, requiring dedicated programming hardware but ensuring robust oxide breakdown for permanent bit setting |
| ESD Protection | 2,000V HBM, permitting safe handling on ungrounded workbenches during manufacturing and rework |
Pinout & Package
AT27C2048-12PI is supplied in a 40-lead, 0.600" wide plastic dual inline package (PDIP), JEDEC MS-011 AC compliant, with 0.100" lead pitch and through-hole mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus accepting 0–131,071 (128K) word locations; A0 LSB, A16 MSB |
| O0–O15 | Data Outputs | 16-bit bidirectional data bus; outputs valid within 120 ns of CE/OE assertion |
| CE | Chip Enable | Active-low global enable; must be stable before address setup to avoid spurious reads |
| OE | Output Enable | Active-low output gate; used with CE for bus contention control in multi-device systems |
| PGM | Program Strobe | Active-low pulse input triggering 50 µs VPP programming cycle when CE is asserted |
| VPP | Programming Voltage | 13.0 V input during programming; must be applied after VCC and removed before VCC |
| VCC | Power Supply | +5V ±10% main supply; powers core logic and output drivers during read and program modes |
| GND | Ground | Two dedicated ground pins (pins 20 and 40); 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 reduces firmware update cycles by >90% vs. legacy EPROMs |
| Integrated Product ID Code | Manufacturer ID (001Eh) and Device Code (00F7h) accessible via A9/VH and A0 toggle, enabling auto-detection in universal programmers |
| Two-Line Control (CE/OE) | Eliminates bus contention in shared-memory systems by decoupling chip selection from output gating |
| Direct Upgrade Path | Pins and timing compatible with AT27C516 (512K-bit) and AT27C1024 (1M-bit), simplifying memory expansion without PCB redesign |
| Industrial Temperature Range | -40°C to +85°C operation ensures reliability in motor drives, PLCs, and outdoor telecom equipment |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded System Boot ROM |
|---|---|
|
Use Scenario: Storing ladder logic firmware and I/O configuration tables in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Non-volatile boot ROM providing deterministic 120 ns read access to initialization code upon power-up. Use Value: Eliminates reliance on slow serial EEPROM or unreliable battery-backed SRAM, ensuring fail-safe startup after brownouts. |
Use Scenario: Hosting BIOS and peripheral initialization routines in 1990s-era embedded controllers using 80C188 or 68EC000 CPUs. IC Role / Device Role / Timing Role: Static memory-mapped instruction store executing directly from address space 0x000000–0x01FFFF. Use Value: Matches exact timing requirements of legacy bus controllers, avoiding WAIT state generation and preserving deterministic execution. |
| Medical Device Calibration Data | Test Equipment Configuration Memory |
|
Use Scenario: Holding factory-calibrated sensor offset/gain coefficients in portable ECG monitors and infusion pumps. IC Role / Device Role / Timing Role: Read-only parameter store accessed once per measurement cycle via fixed-address lookup. Use Value: Guarantees data integrity over 10+ years without refresh, meeting IEC 62304 Class C software safety requirements. |
Use Scenario: Storing instrument-specific test sequence definitions and limit tables in automated benchtop testers. IC Role / Device Role / Timing Role: Configuration ROM mapped into CPU's I/O space, read during self-test initialization. Use Value: Enables field-upgradeable test profiles via EPROM replacement-no firmware reflash tools required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C020-12JC | 2-Mbit (256K × 8) organization; 44-pin PLCC; no A16 pin; 8-bit data bus | Requires bus-width adaptation for 16-bit systems; suited for 8-bit MCU platforms like 8051 | Select when migrating from 8-bit architectures or when PLCC footprint is preferred over PDIP |
| MX27C2001-12F | 2-Mbit (256K × 8) CMOS EPROM; 40-pin PDIP; 120 ns tACC; 5V only (no ±10% tolerance) | Lacks integrated ID code and Rapid™ programming; higher 200 µA standby current | Choose for cost-sensitive replacements where programming speed and auto-ID are non-critical |
Compared with AT27C2048-12PI, AT27C020-12JC offers identical density but narrower 8-bit data path and different packaging, while MX27C2001-12F trades off programming intelligence and low-power standby for lower unit cost-neither is pin-compatible, requiring layout changes for substitution.
Availability
AT27C2048-12PI is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, and legacy system repair requiring stable component supply and long-term obsolescence management.
Supply support for AT27C2048-12PI 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 non-volatile memory and microcontrollers for industrial, automotive, and communications markets.
The AT27C2048 belongs to Atmel's OTP EPROM product line, engineered specifically for firmware and calibration data storage in systems demanding guaranteed data retention, radiation-hardened reliability, and compatibility with legacy 5V bus architectures.
FAQ
What is the maximum operating temperature range for the AT27C2048-12PI?
The AT27C2048-12PI is rated for industrial temperature operation from -40°C to +85°C. This specification is confirmed in the Ordering Information table and DC Operating Conditions section of the datasheet, where "-12PI" suffix explicitly denotes the industrial-grade version with extended thermal performance, making it suitable for deployment in motor control cabinets and outdoor base stations.
Does the AT27C2048-12PI require a separate programming voltage during normal read operation?
No, the AT27C2048-12PI operates from a single 5V ±10% supply (VCC) during read mode. VPP is only required during programming and must be disconnected or held at VCC level (5V) in standby/read modes. The datasheet specifies that VPP = VCC during standby, and applying 13.0 V to VPP outside programming will cause excessive current draw and potential damage to the AT27C2048-12PI.
How many address lines does the AT27C2048-12PI have, and what is their function?
The AT27C2048-12PI has 17 address inputs: A0 through A16. These lines select one of 131,072 (128K) 16-bit words in the memory array. A0 is the least significant bit and A16 is the most significant bit. This 17-bit addressing is explicitly defined in the Pin Configurations table and Block Diagram, and matches the 128K × 16 organization stated in the device description.
Can the AT27C2048-12PI be used as a drop-in replacement for the AT27C1024 in an existing design?
The AT27C2048-12PI is documented as a direct upgrade from the AT27C1024 (1M-bit), sharing identical pinout, voltage levels, and control timing-but doubling the capacity to 2M-bit. However, it is not a drop-in replacement: A16 is added as a new address line (pin 39 in PDIP), requiring PCB trace modification to connect this pin. The datasheet states "direct upgrade", not pin-compatibility, meaning board-level changes are necessary for full utilization.
What decoupling capacitors are required for stable operation of the AT27C2048-12PI?
The AT27C2048-12PI requires two decoupling capacitors: a 0.1 µF ceramic capacitor placed between VCC and GND as close as possible to pins 1 and 20, and a 4.7 µF bulk electrolytic capacitor near the power entry point for arrays containing multiple AT27C2048-12PI devices. This is mandated in the "System Considerations" section to suppress transient excursions caused by CE switching, which otherwise risk violating absolute maximum ratings.
AT27C2048-12PI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 40-DIP (0.600", 15.24mm)
- 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:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 40-PDIP
AT27C2048-12PI FAQ
1.How can I place an order for AT27C2048-12PI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C2048-12PI 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 AT27C2048-12PI reliable?
The price and inventory of AT27C2048-12PI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C2048-12PI is usually 5 days.
3.What payment methods are accepted for AT27C2048-12PI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C2048-12PI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C2048-12PI?
AT27C2048-12PI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C2048-12PI 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 AT27C2048-12PI?
For technical support, including AT27C2048-12PI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C2048-12PI requirements.
6.How does Aetrix verify that AT27C2048-12PI is sourced from the original manufacturer or authorized distributors?
All AT27C2048-12PI 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 AT27C2048-12PI meets industry standards.
7.What is the process for return or replacement of AT27C2048-12PI?
All AT27C2048-12PI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C2048-12PI, 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 AT27C2048-12PI part is unused and in its original packaging.
Return procedure for AT27C2048-12PI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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