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Microchip Technology AT27C2048-55VI
- Part No.:
- AT27C2048-55VI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 40-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
AT27C2048-55VI.pdf
- Description:
- IC EPROM 2MBIT PARALLEL 40VSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,227
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Product details
Overview
AT27C2048-55VI from Atmel is a 2-Mbit (128K × 16) one-time programmable EPROM optimized for high-performance 16/32-bit microprocessor systems, featuring 55 ns read access time, 5V ±10% supply operation, and industrial temperature range (–40°C to +85°C). It supports rapid programming at 50 µs/word and delivers CMOS/TTL-compatible I/O with 2,000V ESD protection.
For engineers reviewing the AT27C2048-55VI datasheet, AT27C2048-55VI pinout, AT27C2048-55VI application, or AT27C2048-55VI equivalent, key selection criteria include read timing (tACC = 55 ns), standby current (≤100 µA), VPP programming voltage (12.0 V), JEDEC-standard VSOP package (40-lead, 10 mm × 14 mm), and OTP firmware storage reliability in embedded control and legacy system upgrades.
Technical Context
The AT27C2048-55VI implements a two-line control architecture (CE and OE) to eliminate bus contention in high-speed systems. Its 128K × 16 organization enables full-word parallel access without WAIT states, directly supporting 16-bit data buses in microprocessor-based designs.
It uses Atmel's Rapid™ Programming Algorithm with verified 50 µs/word typical programming pulse width and integrated product identification code (Manufacturer ID: 001Eh, Device Code: 00F7h), accessed via A9 = 12.0 V and A0 toggling - enabling automated programming equipment compatibility and traceability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2,097,152 bits (128K × 16) - supports full 16-bit word fetches for efficient firmware execution in 16/32-bit CPUs. |
| Read Access Time | 55 ns max - eliminates WAIT states in 16 MHz+ microprocessor systems requiring sub-60 ns memory latency. |
| VCC Supply | 5V ±10% - compatible with standard TTL/CMOS logic rails; no auxiliary voltage required for read mode. |
| Standby Current | 100 µA max - enables low-power retention in battery-backed or intermittently powered embedded controllers. |
| VPP Programming Voltage | 12.0 V ±0.5 V - requires dedicated programming supply; not connected during normal read operation. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade applications including motor drives and PLC modules. |
| ESD Protection | 2,000V HBM - ensures robust handling during board assembly and field service in unshielded environments. |
Pinout & Package
AT27C2048-55VI is supplied in a 40-lead Plastic Thin Small Outline Package (VSOP), 10 mm × 14 mm footprint per JEDEC MO-142 CA, with 1.27 mm lead pitch and gull-wing leads. Both GND pins (pins 21 and 39) 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–A16 mapped directly to CPU address lines. |
| O0–O15 | Data Outputs | 16-bit bidirectional data bus outputs; CMOS/TTL-compatible drive strength (IOL = 2.1 mA, VOH ≥ 2.4 V). |
| CE | Chip Enable | Active-low global enable; controls device power state transition between active (≤35 mA) and standby (≤100 µA). |
| OE | Output Enable | Active-low output gate; enables high-impedance tri-state when deasserted to prevent bus contention. |
| PGM | Program Strobe | Active-low programming control; initiates 50 µs CE-pulse programming cycle when VPP = 12.0 V applied. |
| VPP | Programming Voltage | 12.0 V input required only during programming; must be applied after and removed before VCC per sequencing rules. |
| VCC | Power Supply | 5V ±10% main supply; powers read logic and output buffers; supplies 15 mA typical in active read mode. |
| GND (2×) | Ground | Two dedicated ground pins (21, 39); both must be soldered to PCB ground plane to meet EMI and latchup specs. |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 50 µs/word typical programming time reduces firmware update cycles by >90% vs. legacy EPROMs, accelerating production burn-in. |
| Integrated Product Identification Code | Electronic manufacturer (001Eh) and device (00F7h) IDs accessible via A9 = 12.0 V and A0 toggle - enables auto-detection in universal programmers. |
| Two-Line Control (CE/OE) | Independent chip and output enables allow precise bus timing control in multiprocessor or shared-memory systems without external glue logic. |
| JEDEC-Standard VSOP Package | 40-lead 10 mm × 14 mm VSOP footprint provides drop-in replacement path for legacy PDIP/PLCC designs while reducing board area by ~60%. |
| High Reliability CMOS Process | 200 mA latchup immunity and 2,000V HBM ESD rating ensure operation in electrically noisy industrial environments without external protection. |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded System Upgrade |
|---|---|
|
Use Scenario: Storing firmware for programmable logic controllers operating in factory-floor environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Non-volatile program memory providing deterministic 55 ns read access to instruction words for real-time scan-cycle execution. Use Value: Industrial temperature rating (–40°C to +85°C) and 200 mA latchup immunity ensure uninterrupted operation during motor drive transients and EMI events. |
Use Scenario: Replacing obsolete 1M-bit EPROMs (e.g., AT27C1024) in aging medical imaging or test equipment without PCB redesign. IC Role / Device Role / Timing Role: Pin-compatible OTP memory upgrade delivering 2× density and identical 5V interface, preserving existing socket and timing margins. Use Value: Direct upgrade path with same 40-pin VSOP footprint and identical CE/OE control logic reduces qualification time and rework cost. |
| Microcontroller Boot ROM | Avionics Configuration Memory |
|
Use Scenario: Holding boot code for 16-bit microcontrollers in aerospace-qualified subsystems where radiation tolerance is secondary to proven reliability. IC Role / Device Role / Timing Role: Read-only boot memory with guaranteed 55 ns tACC ensuring first instruction fetch completes within CPU clock budget. Use Value: 2,000V ESD protection and 100 µA standby current support safe handling during avionics integration and low-quiescent power in standby modes. |
Use Scenario: Storing configuration tables for flight control surface actuators requiring immutable, tamper-resistant parameter sets across mission life. IC Role / Device Role / Timing Role: One-time programmable memory preventing runtime corruption; programmed once during final test and sealed. Use Value: Integrated product ID code (001Eh/00F7h) enables traceability and version verification during depot-level maintenance and calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C2048-55PI | Same die, 40-lead PDIP package (0.600" width); higher profile (4.8 mm vs. 1.2 mm) and larger footprint (24.2 mm × 6.6 mm). | Preferred for through-hole prototyping, manual rework, or legacy socket compatibility where surface-mount is impractical. | Select AT27C2048-55PI only when board layout lacks VSOP land pattern or requires hand-soldering capability. |
| AT27C2048-55JI | Same die, 44-lead PLCC package; requires different socket and PCB footprint (16.6 mm × 16.6 mm), with NC pins at positions 1 and 23. | Suitable for high-vibration environments where J-lead mechanical retention outperforms gull-wing VSOP leads. | Choose AT27C2048-55JI if vibration testing shows VSOP solder joint fatigue, and PLCC socket infrastructure already exists. |
Compared with AT27C2048-55PI and AT27C2048-55JI, the AT27C2048-55VI offers the smallest PCB footprint and lowest profile among industrial-grade variants, enabling denser layouts in space-constrained embedded modules while maintaining identical timing, programming, and reliability specs.
Availability
AT27C2048-55VI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded system upgrades, microcontroller boot ROM, and avionics configuration memory requiring stable component supply across extended product lifecycles.
Supply support for AT27C2048-55VI 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 semiconductor manufacturer specializing in microcontrollers, non-volatile memory, and secure authentication devices for industrial, automotive, and consumer applications.
The AT27C2048 product line was designed as a high-density, industrial-temperature OTP EPROM family to replace legacy 512K-bit and 1M-bit EPROMs in firmware-critical embedded systems requiring long-term data retention and programming repeatability.
FAQ
What is the maximum read access time specified for AT27C2048-55VI?
The AT27C2048-55VI has a maximum read access time (tACC) of 55 ns under industrial temperature conditions (–40°C to +85°C) and 5V ±10% supply. This value is guaranteed across the full operating range and enables direct interfacing with 16 MHz microprocessors without WAIT state insertion. The AT27C2048-55VI achieves this performance using optimized CMOS decoding and output buffering circuits.
Does AT27C2048-55VI require a separate programming voltage during normal operation?
No, AT27C2048-55VI operates on a single 5V ±10% supply (VCC) during read mode. The VPP pin (12.0 V ±0.5 V) is required only during programming and must be disconnected or held at VCC during normal read operation. The AT27C2048-55VI datasheet specifies strict sequencing: VCC must be applied before and removed after VPP to prevent latchup or parametric failure.
How many ground connections does AT27C2048-55VI require, and why?
The AT27C2048-55VI has two dedicated GND pins (pins 21 and 39) that must both be connected to the PCB ground plane. This dual-ground design reduces ground bounce, improves noise immunity, and ensures compliance with the 200 mA latchup immunity specification. Leaving either GND pin unconnected risks timing violations, increased EMI susceptibility, and potential device malfunction in high-speed read cycles.
Can AT27C2048-55VI be used as a direct replacement for AT27C1024 in existing designs?
Yes, AT27C2048-55VI is explicitly designed as a direct upgrade from AT27C1024 (1M-bit) and AT27C516 (512K-bit) EPROMs. It shares identical pinout, voltage levels, and control signaling (CE/OE/PGM), with doubled density (128K × 16 vs. 64K × 16). The AT27C2048-55VI maintains the same 40-pin VSOP footprint and timing compatibility, enabling drop-in replacement without layout changes.
What is the purpose of the Integrated Product Identification Code in AT27C2048-55VI?
The Integrated Product Identification Code in AT27C2048-55VI provides electronic manufacturer (001Eh) and device type (00F7h) identification via dedicated address pins (A9 = 12.0 V, A0 toggled). This feature allows industry-standard programmers to auto-detect the AT27C2048-55VI and select correct programming algorithms and voltage profiles, eliminating manual setup errors and improving production yield.
AT27C2048-55VI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 40-TFSOP (0.488", 12.40mm Width)
- Packaging:
- Tray
- 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:
- 55 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-VSOP
AT27C2048-55VI FAQ
1.How can I place an order for AT27C2048-55VI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C2048-55VI 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 AT27C2048-55VI reliable?
The price and inventory of AT27C2048-55VI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C2048-55VI is usually 5 days.
3.What payment methods are accepted for AT27C2048-55VI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C2048-55VI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C2048-55VI?
AT27C2048-55VI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C2048-55VI 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 AT27C2048-55VI?
For technical support, including AT27C2048-55VI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C2048-55VI requirements.
6.How does Aetrix verify that AT27C2048-55VI is sourced from the original manufacturer or authorized distributors?
All AT27C2048-55VI 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 AT27C2048-55VI meets industry standards.
7.What is the process for return or replacement of AT27C2048-55VI?
All AT27C2048-55VI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C2048-55VI, 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 AT27C2048-55VI part is unused and in its original packaging.
Return procedure for AT27C2048-55VI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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