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Microchip Technology AT27C2048-55VC
- Part No.:
- AT27C2048-55VC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 40-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
AT27C2048-55VC.pdf
- Description:
- IC EPROM 2MBIT PARALLEL 40VSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,719
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Product details
Overview
AT27C2048-55VC 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 VSOP-40 (10 mm × 14 mm) packaging. It delivers low active current (35 mA max at 5 MHz) and ultra-low standby current (100 µA max), enabling reliable firmware storage without wait states in embedded control and industrial boot applications.
For engineers reviewing the AT27C2048-55VC datasheet, AT27C2048-55VC pinout, AT27C2048-55VC application, or AT27C2048-55VC equivalent, key selection considerations include its 55 ns tACC timing, dual-line CE/OE control architecture, 128K-word × 16-bit organization, VPP programming voltage requirement (12.0 V ±0.5 V), and JEDEC-compliant VSOP package with verified 40-pin terminal mapping.
Technical Context
The AT27C2048-55VC implements a CMOS-based OTP EPROM architecture with X/Y decoding, output buffers, and integrated product identification logic. Its two-line control (CE and OE) enables bus contention avoidance in high-speed systems, while Rapid™ programming uses 50 µs/word pulses at VPP = 13.0 V and VCC = 6.5 V.
It supports both commercial (0°C to 70°C) and industrial (−40°C to 85°C) 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.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2,097,152 bits (128K words × 16 bits) - supports full 16-bit data bus interfacing without byte-lane splitting. |
| Read Access Time | 55 ns (tACC) - eliminates WAIT states in 5 MHz microprocessor systems with CE/OE-controlled timing. |
| Supply Voltage | 5V ±10% (VCC); 12.0 V ±0.5 V (VPP during programming) - requires dual-rail power design with strict sequencing (VCC before VPP). |
| Current Consumption | 35 mA max active (5 MHz), 100 µA max standby - enables low-power hold modes in battery-backed or energy-sensitive systems. |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded controllers, motor drives, and PLC firmware storage. |
| ESD/Latchup | 2,000V HBM ESD protection; 200 mA latchup immunity - ensures robustness in manufacturing handling and noisy industrial environments. |
| Programming Speed | 50 µs/word typical (Rapid™ algorithm) - reduces production programming cycle time versus legacy EPROMs. |
Pinout & Package
AT27C2048-55VC is housed in a 40-lead Plastic Thin Small Outline Package (VSOP), 10 mm × 14 mm footprint, JEDEC MO-142 CA compliant. Pin 1 is marked by a notch; both GND pins (19 and 40) must be connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting full 128K-word addressing; A0 least significant bit. |
| O0–O15 | Data Outputs | 16-bit bidirectional data bus outputs; TTL/CMOS compatible drive levels (VOH ≥ 2.4 V, VOL ≤ 0.4 V). |
| CE | Chip Enable | Active-low chip select; controls device activation and contributes to tCE timing path (55 ns max). |
| OE | Output Enable | Active-low output gate; enables data output after tOE delay (20 ns max) when CE is asserted. |
| PGM | Program Strobe | Active-low signal initiating programming pulse; requires precise 47.5–52.5 µs width at VPP = 13.0 V. |
| VPP | Programming Voltage | 12.0 V ±0.5 V input for programming; must be sequenced after VCC and decoupled with 0.1 µF capacitor. |
| VCC | Power Supply | 5V ±10% main supply; powers logic and outputs; supplies current up to 35 mA in active read mode. |
| GND | Ground | Two dedicated ground terminals (pins 19 and 40); both must be connected to minimize noise and ensure timing compliance. |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 50 µs/word typical programming time reduces firmware burn-in duration and improves production throughput. |
| Integrated Product Identification Code | Manufacturer ID (001Eh) and Device Code (00F7h) accessible via A9/VH and A0 toggle - enables automatic algorithm selection in industry-standard programmers. |
| Dual-Line Control (CE/OE) | Eliminates bus contention in multi-device systems by allowing independent gating of chip select and output enable signals. |
| JEDEC-Standard Packages | VSOP-40 (10 mm × 14 mm) footprint matches industry layout standards, simplifying PCB redesign from PDIP/PLCC variants. |
| High-Reliability CMOS Process | 2,000V ESD rating and 200 mA latchup immunity ensure survivability during board assembly and field operation. |
Applications
| Industrial PLC Firmware Storage | Legacy System BIOS Replacement |
|---|---|
|
Use Scenario: Storing fixed ladder logic and I/O configuration in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Non-volatile firmware memory providing deterministic 55 ns read access to boot code and runtime routines. Use Value: Eliminates WAIT states in 5 MHz Z80/80C188-based controllers, ensuring real-time scan cycle consistency and reducing jitter in motion control loops. |
Use Scenario: Replacing obsolete 1M-bit EPROMs (e.g., AT27C1024) in legacy PC motherboards and embedded x86 systems requiring BIOS updates. IC Role / Device Role / Timing Role: Drop-in-compatible 128K×16 firmware store with identical pinout and timing margins as predecessor devices. Use Value: Enables direct upgrade path without PCB redesign, preserving existing CE/OE control logic and 5V power architecture. |
| Motor Drive Boot Memory | Test Equipment Configuration Storage |
|
Use Scenario: Holding startup calibration tables and safety-critical initialization sequences in servo and inverter drives operating across −40°C to +85°C. IC Role / Device Role / Timing Role: Industrial-temperature OTP EPROM delivering guaranteed 55 ns access under thermal stress and EMI exposure. Use Value: Ensures deterministic boot timing and immunity to latchup events caused by power rail transients in high-current switching environments. |
Use Scenario: Storing instrument-specific calibration coefficients, test sequence definitions, and user interface strings in automated test equipment (ATE) platforms. IC Role / Device Role / Timing Role: High-reliability firmware store accessed during power-on self-test (POST) and configuration loading phases. Use Value: Leverages 2,000V ESD protection to survive repeated handling during calibration lab reprogramming cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C2048-55PC | Same die, 40-lead PDIP package (0.600" width); no lead pitch or thermal profile constraints. | Suitable for through-hole prototyping, legacy board repair, and manual soldering environments. | Select when mechanical compatibility with existing DIP sockets or hand-soldered layouts is required. |
| AT27C2048-55JI | Same functionality, PLCC-44 package; pin 1 and 23 are NC; requires surface-mount reflow process. | Preferred for high-density boards where VSOP/PDIP footprint is unavailable and J-lead thermal performance is needed. | Choose when board space is constrained but PLCC mounting infrastructure exists and industrial temp range is mandatory. |
Compared with AT27C2048-55PC and AT27C2048-55JI, the AT27C2048-55VC offers the smallest PCB footprint (10 mm × 14 mm), best thermal dissipation for surface-mount assemblies, and direct drop-in replacement capability for VSOP-based designs - making it optimal for space-constrained industrial controllers and modernized legacy systems.
Availability
AT27C2048-55VC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, motor drive boot memory, and legacy system BIOS replacement requiring stable component supply, long-term lifecycle support, and verified industrial-temperature qualification.
Supply support for AT27C2048-55VC 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 series was designed as a high-density, low-power OTP EPROM family targeting firmware storage in 16/32-bit embedded systems where EEPROM endurance or Flash write complexity is unnecessary - emphasizing reliability, fast read access, and seamless migration from earlier EPROM generations.
FAQ
What is the maximum read access time specified for the AT27C2048-55VC?
The AT27C2048-55VC has a maximum read access time (tACC) of 55 ns when CE and OE are both asserted low. This parameter is guaranteed across the full industrial temperature range (−40°C to +85°C) and defines the worst-case delay from valid address and enable inputs to stable data on O0–O15 outputs. The AT27C2048-55VC achieves this timing using CMOS decoding and output buffering without requiring external WAIT-state generation.
Does the AT27C2048-55VC require a separate programming voltage, and what is its value?
Yes, the AT27C2048-55VC requires VPP = 12.0 V ±0.5 V during programming, applied to pin 18. This voltage is distinct from the 5V ±10% VCC supply used for read operations. The AT27C2048-55VC mandates strict power sequencing: VCC must be applied before VPP and removed after VPP to prevent device damage or unreliable programming. A 0.1 µF capacitor between VPP and GND is required to suppress transients.
How many ground connections does the AT27C2048-55VC have, and why are both required?
The AT27C2048-55VC has two dedicated ground terminals: pin 19 and pin 40. Both must be connected to the system ground plane to ensure signal integrity, meet timing specifications (particularly tOH and tDF), and maintain ESD/latchup immunity ratings. Leaving either unconnected risks increased ground bounce, timing violations, and potential failure to meet the 200 mA latchup immunity specification. The AT27C2048-55VC datasheet explicitly states "Both GND pins must be connected."
Can the AT27C2048-55VC be used as a direct replacement for the AT27C1024 in existing designs?
Yes, the AT27C2048-55VC is documented as a direct upgrade from the AT27C1024 (1M-bit) and AT27C516 (512K-bit) EPROMs. It shares identical pin functions, 5V supply compatibility, CE/OE control protocol, and timing architecture. However, due to its 128K×16 organization (vs. 64K×16 for AT27C1024), address decoding may require minor logic adjustment if higher-order address lines (A16) are unused in the original design. The AT27C2048-55VC maintains full functional and pinout compatibility within VSOP-40 layouts.
What is the purpose of the Integrated Product Identification Code in the AT27C2048-55VC?
The Integrated Product Identification Code in the AT27C2048-55VC provides manufacturer (001Eh) and device type (00F7h) identifiers readable via A9 = 12.0 V and A0 toggled - enabling automatic recognition by industry-standard EPROM programmers. This feature ensures correct algorithm selection, voltage application, and verification settings during programming. The AT27C2048-55VC uses this code to eliminate manual setup errors and guarantee repeatable, high-yield production programming across multiple device lots.
AT27C2048-55VC 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:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-VSOP
AT27C2048-55VC FAQ
1.How can I place an order for AT27C2048-55VC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C2048-55VC 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 AT27C2048-55VC reliable?
The price and inventory of AT27C2048-55VC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C2048-55VC is usually 5 days.
3.What payment methods are accepted for AT27C2048-55VC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C2048-55VC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C2048-55VC?
AT27C2048-55VC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C2048-55VC 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 AT27C2048-55VC?
For technical support, including AT27C2048-55VC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C2048-55VC requirements.
6.How does Aetrix verify that AT27C2048-55VC is sourced from the original manufacturer or authorized distributors?
All AT27C2048-55VC 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 AT27C2048-55VC meets industry standards.
7.What is the process for return or replacement of AT27C2048-55VC?
All AT27C2048-55VC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C2048-55VC, 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 AT27C2048-55VC part is unused and in its original packaging.
Return procedure for AT27C2048-55VC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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