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Microchip Technology AT27C2048-90VC
- Part No.:
- AT27C2048-90VC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 40-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
AT27C2048-90VC.pdf
- Description:
- IC EPROM 2MBIT PARALLEL 40VSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,952
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Product details
Overview
AT27C2048-90VC from Atmel is a 2-Mbit (128K × 16) one-time programmable EPROM optimized for high-performance 16/32-bit microprocessor systems, featuring 90 ns read access time, 5V ±10% supply operation, and JEDEC-standard 40-lead VSOP (10 mm × 14 mm) packaging. It supports rapid programming at 50 µs/word and delivers 35 mA active current at 5 MHz.
For engineers reviewing the AT27C2048-90VC datasheet, AT27C2048-90VC pinout, AT27C2048-90VC application, or AT27C2048-90VC equivalent, key selection criteria include its 90 ns access timing, dual-line control (CE/OE), OTP reliability for firmware storage, and compatibility with legacy AT27C516/AT27C1024 designs in space-constrained industrial embedded systems.
Technical Context
The AT27C2048-90VC implements a CMOS-based OTP EPROM architecture with 128K-word × 16-bit organization, enabling direct byte- and word-level firmware access without WAIT states. Its two-line control logic (CE and OE) eliminates bus contention in high-speed memory buses.
It uses Atmel's Rapid™ Programming Algorithm with 50 µs/word typical pulse width and integrated product identification code (Manufacturer ID: 001Eh, Device ID: 00F7h) for automated programmer recognition. Programming requires VPP = 13.0 V ±0.25 V and VCC = 6.5 V ±0.25 V, with strict sequencing (VCC before/after VPP).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2,097,152 bits (128K × 16) - supports full 16-bit data bus interfacing without multiplexing. |
| Read Access Time | 90 ns max - enables direct connection to 10 MHz microprocessors without wait-state insertion. |
| Supply Voltage | 5V ±10% - compatible with standard TTL/CMOS logic rails and legacy 5V system designs. |
| Active Current | 35 mA max at 5 MHz - defines thermal budget for dense EPROM arrays in industrial controllers. |
| Standby Current | 100 µA max - ensures low quiescent power in battery-backed or always-on firmware storage applications. |
| Programming Voltage | VPP = 13.0 V ±0.25 V - requires dedicated high-voltage programming circuitry; not compatible with standard 5V-only programmers. |
| ESD Protection | 2,000V HBM - provides robust handling tolerance during board assembly and field replacement. |
| Operating Range | 0°C to 70°C - commercial temperature grade suitable for office equipment, test instruments, and non-automotive embedded systems. |
Pinout & Package
AT27C2048-90VC is supplied in a 40-lead Plastic Thin Small Outline Package (VSOP), 10 mm × 14 mm body, JEDEC MO-142 CA compliant. Pin 1 is marked by a notch or dot; both GND pins (pins 21 and 39) must be connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting full 128K-word addressing; A0–A16 directly map to physical memory locations. |
| O0–O15 | Data Outputs | 16-bit bidirectional data bus outputs; high-impedance when CE or OE is inactive. |
| CE | Chip Enable | Active-low chip select; controls device activation and reduces standby current to ≤100 µA when high. |
| OE | Output Enable | Active-low output gate; enables data drivers only when CE is also asserted, preventing bus contention. |
| PGM | Program Strobe | Active-low signal initiating 50 µs programming pulse; requires precise VPP/VCC sequencing and external timing control. |
| VPP | Programming Voltage | 13.0 V input for OTP programming; must be applied after VCC and removed before VCC to prevent latchup. |
| VCC | Power Supply | 5V ±10% main supply; powers logic and output buffers during read; supplies 6.5V during programming mode. |
| GND | Ground | Two dedicated ground pins (21, 39); both must be low-inductance connected to minimize noise and ensure timing stability. |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming | 50 µs/word typical - cuts firmware update time by >90% vs. legacy EPROMs, accelerating production programming throughput. |
| Integrated ID Code | Manufacturer ID 001Eh + Device ID 00F7h - enables automatic algorithm selection in industry-standard programmers (e.g., BP Microsystems, Xeltek). |
| Two-Line Control | Separate CE and OE inputs - allows interleaved memory access and clean bus sharing with other peripherals in 16-bit data paths. |
| High-Reliability OTP | 200 mA latchup immunity + 2,000V ESD - ensures field durability in industrial environments with frequent hot-plug or EMI exposure. |
| JEDEC Standard Packages | 40-lead VSOP footprint - provides PCB area savings over PDIP while maintaining compatibility with existing PLCC/PDIP socket footprints via adapter. |
Applications
| Industrial PLC Firmware Storage | Medical Instrument Boot ROM |
|---|---|
|
Use Scenario: Storing fixed boot firmware and calibration tables in programmable logic controllers operating in factory-floor environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Nonvolatile boot ROM providing deterministic 90 ns instruction fetch timing to 16-bit microcontrollers during cold start and watchdog recovery. Use Value: Eliminates reliance on slow serial EEPROM or unreliable flash in safety-critical control loops; OTP prevents accidental overwrite during field service. |
Use Scenario: Holding certified diagnostic firmware and sensor initialization routines in Class II medical devices requiring regulatory traceability and immutable code. IC Role / Device Role / Timing Role: One-time-programmable firmware repository ensuring bit-for-bit reproducibility across production batches and audit-ready revision control. Use Value: Meets IEC 62304 §5.5.2 requirements for software preservation integrity; no firmware rollback or corruption risk post-deployment. |
| Test Equipment Microcode | Legacy System BIOS Replacement |
|
Use Scenario: Hosting microcode for automated test equipment (ATE) pattern generators where firmware updates are infrequent but require absolute reliability between calibration cycles. IC Role / Device Role / Timing Role: High-speed read-only memory delivering deterministic 90 ns instruction latency to FPGA-based sequencers controlling precision analog stimulus generation. Use Value: Avoids flash wear-out failures in 24/7 lab environments; supports >100,000 power cycles without degradation per JEDEC JESD22-A117. |
Use Scenario: Replacing obsolete 512K-bit or 1M-bit EPROMs (e.g., AT27C516, AT27C1024) in legacy industrial PCs and CNC controllers needing firmware expansion without board redesign. IC Role / Device Role / Timing Role: Drop-in-compatible upgrade path preserving existing 40-pin socket layout and 5V interface while doubling memory capacity to 128K × 16. Use Value: Extends product lifecycle without PCB respin; maintains identical timing margins and drive strength for backward-compatible system integration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C2048-90PC | Same die, 40-lead PDIP package (0.600" width); higher profile (4.8 mm vs. 1.2 mm) and larger PCB footprint. | Preferred for through-hole prototyping, manual rework, or legacy socket compatibility where surface-mount assembly is unavailable. | Select AT27C2048-90PC if board layout lacks VSOP land pattern or requires hand-soldering capability. |
| AT27C2048-90JI | Same functionality, industrial temperature range (-40°C to +85°C); otherwise identical AC/DC specs and pinout. | Suitable for outdoor, automotive-adjacent, or uncontrolled-environment deployments where commercial-grade thermal margin is insufficient. | Select AT27C2048-90JI if operating ambient exceeds 70°C or requires extended temperature qualification per AEC-Q100 Class 3. |
Compared with AT27C2048-90PC and AT27C2048-90JI, the AT27C2048-90VC offers the smallest PCB footprint and lowest profile for space-constrained commercial applications, while retaining identical timing, programming behavior, and firmware compatibility - making it optimal for modern compact instrumentation and embedded controllers where thermal headroom is sufficient.
Availability
AT27C2048-90VC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical instrument boot ROM, and test equipment microcode requiring stable component supply, long-term obsolescence management, and guaranteed traceable sourcing.
Supply support for AT27C2048-90VC 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, nonvolatile memory, and secure authentication ICs for industrial, automotive, and consumer applications.
The AT27C2048 belongs to Atmel's OTP EPROM product line, designed specifically to provide reliable, high-density, pin-compatible firmware storage for 16/32-bit microprocessor systems requiring zero-risk code immutability and long-term data retention.
FAQ
What is the maximum read access time specified for the AT27C2048-90VC?
The AT27C2048-90VC has a maximum read access time of 90 ns under commercial temperature conditions (0°C to 70°C) and 5V ±10% supply. This value is guaranteed across all operating corners and defines the worst-case delay from valid address/CE/OE assertion to stable data on O0–O15. The AT27C2048-90VC achieves this timing without requiring external WAIT-state generation in 10 MHz microprocessor interfaces.
Does the AT27C2048-90VC support in-system programming?
No, the AT27C2048-90VC does not support in-system programming. It requires external high-voltage programming equipment applying VPP = 13.0 V ±0.25 V and VCC = 6.5 V ±0.25 V with strict sequencing. Programming must occur in a dedicated programmer prior to board assembly; the AT27C2048-90VC cannot be programmed while soldered into a live system due to voltage and timing constraints.
What are the required decoupling capacitors for stable operation of the AT27C2048-90VC?
The AT27C2048-90VC requires a 0.1 µF ceramic capacitor placed between VCC and GND, mounted as close as possible to pins 20 (VCC) and 21/39 (GND). For multi-device EPROM arrays, a 4.7 µF bulk electrolytic capacitor must also be connected between VCC and GND near the power entry point. These values are mandated in the datasheet to suppress transient excursions during CE transitions and ensure reliable 90 ns timing compliance.
How is the product identification code accessed on the AT27C2048-90VC?
The AT27C2048-90VC integrates a manufacturer ID (001Eh) and device ID (00F7h) accessible via its Product Identification mode. To read them: hold A1–A16 low, set A9 to 12.0 V ±0.5 V (VID), toggle A0 between low (for Manufacturer ID) and high (for Device ID), and assert CE/OE low. The AT27C2048-90VC outputs the 16-bit ID word on O0–O15, enabling automatic detection by industry-standard programmers.
Is the AT27C2048-90VC pin-compatible with earlier Atmel EPROMs like the AT27C1024?
Yes, the AT27C2048-90VC is pin-compatible with AT27C1024 and AT27C516 in the same VSOP package (40V), sharing identical pin functions, voltage levels, and timing interface. However, the AT27C2048-90VC doubles the memory depth (128K × 16 vs. 64K × 16) and adds PGM/VPP pins - these are unused in read mode but must be properly terminated (VPP to VCC via 10 kΩ pull-up in standby) to avoid conflicts.
AT27C2048-90VC 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:
- 90 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
AT27C2048-90VC FAQ
1.How can I place an order for AT27C2048-90VC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C2048-90VC 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 AT27C2048-90VC reliable?
The price and inventory of AT27C2048-90VC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C2048-90VC is usually 5 days.
3.What payment methods are accepted for AT27C2048-90VC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C2048-90VC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C2048-90VC?
AT27C2048-90VC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C2048-90VC 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 AT27C2048-90VC?
For technical support, including AT27C2048-90VC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C2048-90VC requirements.
6.How does Aetrix verify that AT27C2048-90VC is sourced from the original manufacturer or authorized distributors?
All AT27C2048-90VC 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 AT27C2048-90VC meets industry standards.
7.What is the process for return or replacement of AT27C2048-90VC?
All AT27C2048-90VC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C2048-90VC, 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 AT27C2048-90VC part is unused and in its original packaging.
Return procedure for AT27C2048-90VC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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