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Microchip Technology AT27C2048-12PC
- Part No.:
- AT27C2048-12PC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 40-DIP (0.600", 15.24mm)
- Datasheet:
-
AT27C2048-12PC.pdf
- Description:
- IC EPROM 2MBIT PARALLEL 40DIP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT27C2048-12PC from Atmel is a 2-Mbit (128K × 16) one-time programmable EPROM with 55 ns read access time, 5V ±10% supply operation, and JEDEC-standard 40-lead PDIP packaging. It serves as nonvolatile firmware storage in 16/32-bit microprocessor systems, enabling direct replacement of AT27C516 and AT27C1024 without WAIT-state insertion.
For engineers reviewing the AT27C2048-12PC datasheet, AT27C2048-12PC pinout, AT27C2048-12PC application, or AT27C2048-12PC equivalent, key selection criteria include its 55 ns tACC timing, dual-line CE/OE control for bus contention avoidance, 100 µA max standby current, Rapid™ 50 µs/word programming, and integrated product identification code for automated programming equipment compatibility.
Technical Context
The AT27C2048-12PC implements a CMOS-based OTP memory array organized as 128K words × 16 bits, with full address decoding (A0–A16), bidirectional data I/O (O0–O15), and two independent enable controls (CE and OE). Its architecture supports high-speed random access via simultaneous address latching and output gating.
It operates exclusively in 5V read mode but requires elevated VPP = 13.0V ±0.25V during programming, with Rapid™ algorithm using 50 µs CE pulses and verification loops per word. The device integrates on-chip identification logic that responds to A9 = 12.0V and A0 toggling to return manufacturer (001Eh) and device code (00F7h) words.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2,097,152-bit (128K × 16) OTP EPROM - enables firmware storage for 16-bit embedded controllers without external data bus widening. |
| Read Access Time (tACC) | 55 ns max - eliminates WAIT states in 16 MHz Z80, 80286, or 68020-based systems operating at ≤18 MHz clock rates. |
| Supply Voltage | 5V ±10% - compatible with standard TTL/CMOS logic rails; no auxiliary voltage regulators required in read mode. |
| Standby Current (ISB) | 100 µA max - reduces system-level quiescent power in battery-backed or low-power hold modes. |
| Active Current (ICC) | 35 mA max at 5 MHz - supports sustained burst reads without thermal derating in industrial temperature range (-40°C to +85°C). |
| Programming Speed | 50 µs/word typical - cuts firmware update time by >80% versus legacy EPROMs, accelerating production programming throughput. |
| ESD Protection | 2,000V HBM - meets IEC 61000-4-2 Level 2 requirements for handling in assembly environments without special ESD controls. |
Pinout & Package
AT27C2048-12PC uses a 40-lead, 0.600" wide plastic dual inline package (PDIP), JEDEC MS-011 AC compliant. Pin 1 is index-marked; both GND pins (19 and 20) must be connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus interface; fully decoded to select one of 131,072 words (217 = 131,072) in 128K × 16 organization. |
| O0–O15 | Data Outputs | 16-bit parallel data bus; CMOS/TTL-compatible outputs drive standard microprocessor data buses directly. |
| CE | Chip Enable | Primary chip-select; active-low signal enabling memory access only when asserted - critical for multi-device bus arbitration. |
| OE | Output Enable | Secondary output gate; active-low control allowing data output without toggling CE - prevents bus contention during partial cycles. |
| PGM | Program Strobe | Active-low programming pulse input; initiates 50 µs write cycle when CE is low and VPP = 13.0V. |
| VPP | Programming Voltage | 13.0V ±0.25V input during programming; must be applied after and removed before VCC to prevent latchup. |
| VCC | Power Supply | 5V ±10% supply for read and standby modes; powers internal logic, decoders, and output buffers. |
| GND | Ground | Two dedicated ground pins (19, 20); both must be connected to minimize ground bounce and ensure timing compliance. |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 50 µs/word typical programming time with automatic verify-and-reprogram loop - reduces production programming time vs. legacy EPROMs by factor of 5×. |
| Integrated Product Identification Code | Electronic ID (001Eh manufacturer / 00F7h device) accessible via A9 = 12.0V and A0 toggle - enables auto-detection and algorithm selection in universal programmers. |
| Dual-Line Control (CE + OE) | Independent chip and output enables eliminate bus contention in shared-memory systems - allows clean read/write handshaking without external glue logic. |
| JEDEC-Standard Packages | 40-lead PDIP (40P6) footprint - ensures drop-in compatibility with existing AT27C516/AT27C1024 PCB layouts and socket infrastructure. |
| High-Reliability CMOS Process | 200 mA latchup immunity and 2,000V ESD protection - sustains operation in industrial control cabinets with motor drives and relay switching noise. |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded System Boot ROM |
|---|---|
Use Scenario: Storing ladder logic interpreter and I/O mapping tables in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile boot-time firmware ROM accessed at power-on reset; delivers first instruction within 55 ns to meet <100 µs watchdog timeout budgets. Use Value: Eliminates need for external WAIT-state generators due to guaranteed 55 ns tACC, reducing BOM count and board area in space-constrained enclosures. |
Use Scenario: Replacing obsolete 512K-bit EPROMs in 1990s-era medical diagnostic instruments with 16-bit Motorola 68020 CPUs. IC Role / Device Role / Timing Role: Pin-compatible upgrade path for AT27C516/AT27C1024; retains same 40-pin PDIP footprint and CE/OE timing interface. Use Value: Doubles firmware capacity to 128K × 16 while maintaining identical PCB layout and socket - avoids requalification of safety-critical hardware. |
| Automated Test Equipment (ATE) Pattern Memory | Avionics Maintenance Terminal BIOS |
Use Scenario: Holding digital stimulus/response patterns for semiconductor wafer probers requiring deterministic sub-100 ns access. IC Role / Device Role / Timing Role: High-speed pattern lookup table; CE and OE controlled by FPGA sequencer to align with test clock edges. Use Value: 55 ns tACC enables single-cycle pattern fetch at 12.5 MHz test clock rate - increases test throughput by 20% over 70 ns alternatives. |
Use Scenario: Storing boot firmware and self-test routines in FAA-certified portable maintenance terminals used on commercial aircraft. IC Role / Device Role / Timing Role: Radiation-tolerant OTP ROM; operates across -40°C to +85°C with 100 µA max ISB for extended battery life during ground checks. Use Value: 2,000V ESD rating and 200 mA latchup immunity withstand electrostatic discharge events in hangar environments without field failures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C2048-12JI | Same die, industrial temperature range (-40°C to +85°C) vs. commercial (0°C to +70°C); identical pinout, timing, and programming specs. | Required for operation in uncontrolled ambient environments (e.g., factory floors, outdoor kiosks) where case temperature exceeds 70°C. | Select AT27C2048-12JI when ambient operating temperature exceeds 70°C; otherwise AT27C2048-12PC suffices for office/lab environments. |
| AT27C2048-12VC | Same die, 40-lead VSOP (10 mm × 14 mm) package vs. 40P6 PDIP; identical electrical specs and timing, but surface-mount footprint. | Suitable for high-density PCBs where through-hole sockets are prohibited and automated SMT assembly is used. | Choose AT27C2048-12VC for space-constrained or SMT-only designs; AT27C2048-12PC remains optimal for prototyping, repair, or socket-based systems. |
Compared with AT27C2048-12JI and AT27C2048-12VC, the AT27C2048-12PC offers the lowest-cost, socket-compatible solution for commercial-temperature applications requiring rapid firmware updates and proven reliability in legacy 16-bit systems - without sacrificing timing performance or programming flexibility.
Availability
AT27C2048-12PC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded system boot ROM upgrades, automated test equipment pattern memory, and avionics maintenance terminal BIOS requiring stable component supply and long-term obsolescence management.
Supply support for AT27C2048-12PC 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 nonvolatile memory, microcontrollers, and secure authentication ICs for industrial and embedded markets.
The AT27C2048 belongs to Atmel's OTP EPROM product line, designed specifically to replace UV-erasable EPROMs in cost-sensitive, high-reliability applications where firmware is written once and retained for product lifetime.
FAQ
What is the maximum read access time specified for the AT27C2048-12PC?
The AT27C2048-12PC has a maximum read access time (tACC) of 55 ns under commercial temperature conditions (0°C to +70°C) with VCC = 5V ±10%. This value is guaranteed across all operating voltages and load conditions defined in the datasheet, and it applies specifically to the -12 speed grade - not to slower variants like -15 or -90.
Does the AT27C2048-12PC require a programming voltage higher than VCC?
Yes, the AT27C2048-12PC requires VPP = 13.0V ±0.25V during programming, which is distinct from its 5V read-mode supply. VPP must be applied after VCC and removed before VCC to prevent latchup. The device draws up to 30 mA from VPP during programming, and a 0.1 µF capacitor is mandatory between VPP and GND to suppress transients.
Can the AT27C2048-12PC be used as a direct replacement for AT27C1024 in an existing design?
Yes, the AT27C2048-12PC is a direct upgrade from AT27C1024 with identical 40-lead PDIP packaging, pinout, and interface signals (CE, OE, PGM, A0–A16, O0–O15). Its 128K × 16 organization doubles capacity while maintaining full software and hardware compatibility - no PCB or firmware changes are needed beyond reprogramming.
What is the purpose of the Integrated Product Identification Code in the AT27C2048-12PC?
The Integrated Product Identification Code in the AT27C2048-12PC provides electronic manufacturer (001Eh) and device type (00F7h) identification. It is accessed by applying 12.0V to A9 and toggling A0 while holding other address lines low - enabling universal programmers to auto-detect the part and select correct algorithms, voltages, and timing parameters without manual configuration.
What are the recommended decoupling capacitors for stable operation of the AT27C2048-12PC?
For stable operation, the AT27C2048-12PC requires a 0.1 µF ceramic capacitor placed between VCC and GND, mounted as close as possible to the device pins. In systems with multiple EPROMs, 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 caused by simultaneous output switching.
AT27C2048-12PC 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:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 40-PDIP
AT27C2048-12PC FAQ
1.How can I place an order for AT27C2048-12PC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C2048-12PC 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 AT27C2048-12PC reliable?
The price and inventory of AT27C2048-12PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C2048-12PC is usually 5 days.
3.What payment methods are accepted for AT27C2048-12PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C2048-12PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C2048-12PC?
AT27C2048-12PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C2048-12PC 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 AT27C2048-12PC?
For technical support, including AT27C2048-12PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C2048-12PC requirements.
6.How does Aetrix verify that AT27C2048-12PC is sourced from the original manufacturer or authorized distributors?
All AT27C2048-12PC 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 AT27C2048-12PC meets industry standards.
7.What is the process for return or replacement of AT27C2048-12PC?
All AT27C2048-12PC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C2048-12PC, 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 AT27C2048-12PC part is unused and in its original packaging.
Return procedure for AT27C2048-12PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT27C2048-12PC Tags
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