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Microchip Technology AT27C2048-70PC
- Part No.:
- AT27C2048-70PC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 40-DIP (0.600", 15.24mm)
- Datasheet:
-
AT27C2048-70PC.pdf
- Description:
- IC EPROM 2MBIT PARALLEL 40DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,107
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Product details
Overview
AT27C2048-70PC from Atmel is a 2-Mbit (128K × 16) one-time programmable EPROM optimized for high-performance 16/32-bit microprocessor systems, featuring 70 ns read access time, 5V ±10% supply, and JEDEC-standard 40-lead PDIP package. It delivers reliable firmware storage with CMOS/TTL-compatible I/O, rapid 50 µs/word programming, and industrial-grade reliability including 2,000V ESD protection.
For engineers reviewing the AT27C2048-70PC datasheet, AT27C2048-70PC pinout, AT27C2048-70PC application, or AT27C2048-70PC equivalent, key selection criteria include read timing (tACC = 70 ns), standby current (≤100 µA), dual-line control (CE/OE), OTP architecture, and compatibility with legacy AT27C516/AT27C1024 upgrades in embedded boot memory designs.
Technical Context
The AT27C2048-70PC implements a two-line control architecture using CE and OE to manage bus contention in high-speed systems, with address decoding across A0–A16 and 16-bit bidirectional data outputs O0–O15. Its Rapid™ Programming Algorithm uses precise 50 µs ±5% PGM pulses at VPP = 13.0V and VCC = 6.5V for verified word-by-word programming.
It supports product identification via A9 voltage sensing (11.5–12.5V) and A0 toggling to select manufacturer ID (001Eh) or device code (00F7h), enabling automated programmer recognition. The device operates across commercial (0°C to 70°C) temperature range and requires decoupling with 0.1 µF ceramic + 4.7 µF bulk capacitors per system design guidelines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Capacity | 2,097,152 bits (128K words × 16 bits) - enables full firmware image storage for 16-bit MCUs without banking |
| Read Access Time | 70 ns max - eliminates WAIT states in 14 MHz Z80 or 20 MHz 80286-based systems |
| Supply Voltage | 5V ±10% - compatible with standard TTL/CMOS logic rails and legacy power domains |
| Standby Current | ≤100 µA - reduces quiescent power in battery-backed or low-power hold modes |
| Active Current | ≤35 mA at 5 MHz - supports sustained burst reads without thermal derating |
| ESD Protection | 2,000V HBM - ensures robustness during manual handling and board assembly |
| Programming Speed | 50 µs/word typical - cuts firmware update time by >90% vs. older EPROMs |
Pinout & Package
AT27C2048-70PC 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 1 is marked by a notch or dot; both GND pins (11 and 20) must be connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus interface supporting full 128K-word addressing space |
| O0–O15 | Data Outputs | 16-bit parallel output bus, TTL/CMOS-compatible, 2.4V VOH min at -400 µA |
| CE | Chip Enable | Active-low global enable; controls device activation and standby entry (VIH ≥2.0V disables) |
| OE | Output Enable | Active-low output gate; allows shared bus operation with other peripherals when high-Z |
| PGM | Program Strobe | Active-low programming pulse input synchronized with CE for Rapid™ algorithm execution |
| VPP | Programming Voltage | 13.0V ±0.25V input during programming; must be applied after and removed before VCC |
| VCC | Power Supply | 5V ±10% main supply; powers core logic and I/O buffers in read/standby modes |
| GND (pins 11, 20) | Ground Reference | Dual ground connections required for noise immunity and stable DC bias |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 50 µs/word typical programming time with auto-verify loop - reduces production programming cycle time by factor of 5 vs. conventional EPROMs |
| Integrated Product ID Code | Manufacturer ID (001Eh) and Device Code (00F7h) accessible via A9/A0 - enables plug-and-play recognition in universal programmers |
| Two-Line Control (CE/OE) | Independent chip and output enables - eliminates bus contention in multi-peripheral 16-bit data bus architectures |
| High-Reliability CMOS Process | 200 mA latchup immunity and 2,000V ESD rating - meets industrial handling and long-term field reliability requirements |
| Direct Upgrade Path | Pin- and software-compatible replacement for AT27C516 (512K) and AT27C1024 (1M) - simplifies memory expansion without PCB redesign |
Applications
| Industrial PLC Firmware Storage | Legacy PC BIOS Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic and I/O mapping tables in DIN-rail mounted programmable logic controllers operating continuously in factory environments. IC Role / Device Role / Timing Role: Non-volatile boot-time firmware ROM providing deterministic 70 ns instruction fetch latency to 16-bit microcontrollers. Use Value: Eliminates disk-based boot delays and mechanical failure risks while maintaining compatibility with existing 5V ISA bus controller designs. |
Use Scenario: Holding POST routines and hardware initialization code in early x86-based industrial PCs where flash memory was not yet standardized. IC Role / Device Role / Timing Role: Primary boot ROM mapped to upper memory area (F0000h–FFFFFh), accessed via 20-bit address bus with CE/OE gating. Use Value: Enables cold-start execution within 100 µs of power-on reset due to sub-100 ns tACC and zero wait-state operation. |
| Military Avionics Configuration Memory | Medical Imaging System Calibration Data |
Use Scenario: Storing flight-critical configuration parameters and sensor calibration coefficients in airborne mission computers requiring radiation-tolerant non-volatility. IC Role / Device Role / Timing Role: OTP memory holding immutable system constants, accessed only at power-up under MIL-STD-810G environmental stress. Use Value: Guarantees data integrity over 20+ year service life with no risk of accidental overwrite or bit corruption from EMI. |
Use Scenario: Retaining gamma correction tables and detector gain coefficients in portable X-ray and ultrasound units subject to frequent power cycling. IC Role / Device Role / Timing Role: Read-only calibration repository accessed during warm-up sequence by ARM7-based imaging controller. Use Value: Provides consistent image quality across devices via factory-programmed 16-bit precision coefficients with <100 µA standby draw. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C2048-70JI | Same die, industrial temperature range (-40°C to +85°C), identical PDIP package (40P6) | Required for extended-temperature deployments; higher ISB2 (1 mA) vs. 100 µA in commercial grade | Select AT27C2048-70JI when operating outside 0°C–70°C ambient or requiring AEC-Q200 alignment |
| AM27C2048-70DC | AMD second-source version; same 70 ns tACC, 5V supply, and pinout but different ID codes and programming voltage tolerance (VPP = 12.5V ±0.5V) | Valid for drop-in replacement only if programmer supports AMD-specific VID and verification thresholds | Choose AM27C2048-70DC only when sourcing continuity is mandated and programming tooling is validated for AMD variants |
Compared with AT27C2048-70PC, the AT27C2048-70JI offers extended thermal margin at the cost of higher standby current, while AM27C2048-70DC provides supply-chain redundancy but demands revalidation of programming algorithms and voltage margins.
Availability
AT27C2048-70PC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy PC BIOS boot ROMs, military avionics configuration memory, and medical imaging system calibration data requiring stable component supply across long-lifecycle programs.
Supply support for AT27C2048-70PC 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, non-volatile memory, and secure authentication ICs for industrial, automotive, and consumer applications.
The AT27C2048 belongs to Atmel's OTP EPROM product line, designed specifically to replace UV-erasable EPROMs with faster, more reliable, and easier-to-program one-time solutions for embedded firmware and configuration storage.
FAQ
What is the maximum read access time specified for the AT27C2048-70PC?
The AT27C2048-70PC has a maximum read access time (tACC) of 70 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 directly determines whether the device can operate without WAIT states in a given microprocessor bus timing budget.
Does the AT27C2048-70PC require a programming voltage higher than VCC?
Yes, the AT27C2048-70PC requires VPP = 13.0V ±0.25V during programming, which is significantly higher than its 5V read-mode supply. VPP must be applied after VCC and removed before VCC to prevent latchup. The device includes internal circuitry to isolate VPP from the core logic during read mode, ensuring safe 5V-only operation outside programming cycles.
Can the AT27C2048-70PC be used as a direct replacement for the AT27C1024 in an existing design?
Yes, the AT27C2048-70PC is explicitly designed as a direct upgrade from the AT27C1024 (1M-bit) and AT27C516 (512K-bit) EPROMs. It shares identical pinout, voltage levels, timing interfaces (CE/OE), and programming protocols. No PCB changes are needed - only firmware image expansion to fill the 128K × 16 capacity is required.
What decoupling capacitors are recommended for stable operation of the AT27C2048-70PC?
Atmel specifies a 0.1 µF high-frequency ceramic capacitor placed between VCC and GND as close as possible to the AT27C2048-70PC package, plus a 4.7 µF bulk electrolytic capacitor near the power entry point of the EPROM array. These values suppress transient excursions caused by CE switching and stabilize VCC during rapid output transitions, preventing non-conformance per absolute maximum ratings.
How does the Integrated Product Identification Code function in the AT27C2048-70PC?
The AT27C2048-70PC implements an electronic ID code accessible by setting A9 to 11.5–12.5V (VID) and toggling A0: low selects Manufacturer ID (001Eh), high selects Device Code (00F7h). This feature allows industry-standard programmers to auto-detect the AT27C2048-70PC and load correct algorithms, eliminating manual part selection errors during production programming.
AT27C2048-70PC 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:
- 70 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
AT27C2048-70PC FAQ
1.How can I place an order for AT27C2048-70PC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C2048-70PC 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 AT27C2048-70PC reliable?
The price and inventory of AT27C2048-70PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C2048-70PC is usually 5 days.
3.What payment methods are accepted for AT27C2048-70PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C2048-70PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C2048-70PC?
AT27C2048-70PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C2048-70PC 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 AT27C2048-70PC?
For technical support, including AT27C2048-70PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C2048-70PC requirements.
6.How does Aetrix verify that AT27C2048-70PC is sourced from the original manufacturer or authorized distributors?
All AT27C2048-70PC 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 AT27C2048-70PC meets industry standards.
7.What is the process for return or replacement of AT27C2048-70PC?
All AT27C2048-70PC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C2048-70PC, 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 AT27C2048-70PC part is unused and in its original packaging.
Return procedure for AT27C2048-70PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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