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Microchip Technology AT27C2048-55PU
- Part No.:
- AT27C2048-55PU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 40-DIP (0.600", 15.24mm)
- Datasheet:
-
AT27C2048-55PU.pdf
- Description:
- IC EPROM 2MBIT PARALLEL 40DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,501
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Product details
Overview
AT27C2048-55PU 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 integrates product identification code for automated programming equipment compatibility.
For engineers reviewing the AT27C2048-55PU datasheet, AT27C2048-55PU pinout, AT27C2048-55PU application, or AT27C2048-55PU equivalent, key selection criteria include OTP reliability, JEDEC-standard PDIP package compatibility, CE/OE dual-line control for bus contention avoidance, and verified 128K-word × 16-bit organization for firmware storage in legacy embedded systems.
Technical Context
The AT27C2048-55PU implements a CMOS-based OTP EPROM architecture with X/Y decoding and output buffers enabling sub-55 ns address-to-output delay under CE = OE = VIL. Its two-line control (CE, OE) eliminates bus contention in high-speed systems, and integrated product identification uses A9 voltage sensing (12.0 V ±0.5 V) and A0 toggling to select manufacturer/device codes.
Rapid programming relies on precise VPP = 13.0 V ±0.25 V and VCC = 6.5 V ±0.25 V sequencing, with 50 µs ±5% PGM pulse width and verification loop up to 10 retries per word. Standby current remains ≤100 µA (CMOS mode) with both GND pins required for stable operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2,097,152-bit (128K × 16) OTP EPROM - enables full firmware image storage for 16-bit microcontrollers without external memory expansion. |
| Read Access Time | 55 ns max - eliminates WAIT states in 5 MHz microprocessor buses, ensuring cycle-accurate timing compliance. |
| Supply Voltage | 5 V ±10% - compatible with standard TTL/CMOS logic rails and legacy power domains without regulation overhead. |
| Active Current | 35 mA max at 5 MHz - defines thermal budget for dense EPROM arrays; typical ICC is 15 mA during read. |
| Standby Current | 100 µA max (CMOS mode) - supports low-power hold states in battery-backed or intermittent-operation systems. |
| Programming Voltage | VPP = 13.0 V ±0.25 V - requires dedicated high-voltage programming circuitry; VCC must be applied before/removed after VPP. |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments including motor control, instrumentation, and telecom infrastructure. |
Pinout & Package
AT27C2048-55PU is packaged in a 40-lead PDIP (40P6), 0.600" wide plastic dual inline package conforming to JEDEC MS-011. Both GND pins (pins 12 and 27) must be connected for ESD robustness and signal integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting 128K-word addressing; A0–A16 directly map to memory locations without multiplexing. |
| O0–O15 | Data Outputs | 16-bit parallel data bus; outputs drive TTL/CMOS loads with VOH ≥ 2.4 V (IOH = –400 µA) and VOL ≤ 0.4 V (IOL = 2.1 mA). |
| CE | Chip Enable | Active-low chip select; controls device activation and initiates rapid programming when pulsed at 50 µs width with VPP applied. |
| OE | Output Enable | Active-low output gate; decouples data bus during address transitions to prevent bus contention in multi-device systems. |
| PGM | Program Strobe | Active-low programming trigger; used with CE and VPP to initiate write cycles; requires precise timing (tPW = 47.5–52.5 µs). |
| VPP | Programming Voltage | 13.0 V ±0.25 V input for programming; must be sequenced with VCC (applied before/removed after); internal charge pump not present. |
| VCC | Power Supply | 5 V ±10% main supply; provides core logic and output buffer power; supplies 35 mA max active current at 5 MHz. |
| GND (2×) | Ground Reference | Pins 12 and 27 serve as separate ground returns; both must be connected to minimize ground bounce and ensure latchup immunity (200 mA). |
Key Features
| Feature | Design Value |
|---|---|
| Rapid Programming Algorithm | 50 µs/word typical programming time with up to 10 verification retries per word - reduces production programming cycle time by >70% vs. legacy EPROMs. |
| Integrated Product Identification Code | Manufacturer ID (001Eh) and Device Code (00F7h) accessible via A9 = 12.0 V and A0 toggle - enables auto-detection and algorithm selection in universal programmers. |
| Two-Line Control Architecture | Independent CE and OE inputs - allows overlapping address setup and output enable timing to maximize bus throughput in burst-read applications. |
| ESD & Latchup Protection | 2,000 V HBM ESD rating and 200 mA latchup immunity - ensures survivability during handling and operation in noisy industrial environments. |
| JEDEC-Standard Packaging | 40-lead PDIP (40P6) footprint - provides drop-in replacement path for AT27C516/AT27C1024 and compatibility with legacy socketed PCB layouts. |
Applications
| Industrial PLC Firmware Storage | Legacy Test Equipment Boot ROM |
|---|---|
|
Use Scenario: Stores fixed firmware for programmable logic controllers operating in factory-floor environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Nonvolatile boot memory providing deterministic 55 ns instruction fetch timing to 16-bit microcontrollers during cold start and runtime execution. Use Value: Eliminates reliance on slower serial EEPROM or external flash, reducing boot latency and avoiding complex initialization sequences. |
Use Scenario: Holds calibration routines and self-test code in automated test equipment requiring field-upgradeable but tamper-resistant firmware. IC Role / Device Role / Timing Role: OTP configuration store accessed during power-on reset; CE/OE timing ensures glitch-free reads under variable load conditions. Use Value: Prevents accidental reprogramming while enabling reliable field updates via dedicated programming stations with VPP control. |
| Military Communication Radio BIOS | Medical Imaging System Boot Loader |
|
Use Scenario: Stores secure boot code in tactical radios where firmware integrity must be guaranteed across extended service life without remote update capability. IC Role / Device Role / Timing Role: Immutable BIOS memory mapped to CPU address space; 128K × 16 organization matches 16-bit data bus width of host processor. Use Value: Provides tamper-evident firmware storage with 2,000 V ESD protection critical for ruggedized portable deployments. |
Use Scenario: Hosts diagnostic initialization routines in MRI and CT scanner subsystems requiring certified, unalterable startup code. IC Role / Device Role / Timing Role: High-reliability read-only memory delivering sub-60 ns instruction fetches to real-time DSP cores during system power-up. Use Value: Meets IEC 60601-1 safety requirements through proven CMOS process reliability and 200 mA latchup immunity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C1024-55PU | 1-Mbit (64K × 16), same 55 ns speed and PDIP package, but half the density; lacks A17 address line. | Suitable only for systems with ≤64K-word firmware footprints; cannot replace AT27C2048-55PU without hardware redesign. | Select when cost sensitivity outweighs memory headroom needs and existing layout supports 40-pin PDIP. |
| AM27C2048-55DC | Functionally identical 2-Mbit OTP EPROM from AMD; same pinout, AC/DC specs, and programming algorithm; RoHS-compliant green packaging. | Drop-in replacement with identical timing and voltage requirements; validated for use in Atmel-programmed systems. | Choose for supply chain diversification where AMD-sourced parts meet procurement policies and qualification timelines. |
Compared with AT27C2048-55PU, AT27C1024-55PU halves memory capacity without reducing package size or cost proportionally, while AM27C2048-55DC offers identical functionality with alternate sourcing-making it the only true functional substitute without design impact.
Availability
AT27C2048-55PU is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy test equipment boot ROM, military communication radio BIOS, and medical imaging system boot loader applications requiring stable component supply across extended product lifecycles.
Supply support for AT27C2048-55PU 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, designed high-reliability nonvolatile memory and microcontroller solutions for industrial, automotive, and communications markets before its 2016 acquisition.
The AT27C2048 product line delivers OTP EPROMs optimized for deterministic boot performance and long-term data retention in systems where firmware immutability and JEDEC package compatibility are mandatory design constraints.
FAQ
What is the maximum programming voltage required for AT27C2048-55PU?
The AT27C2048-55PU requires VPP = 13.0 V ±0.25 V during programming, with strict sequencing: VCC must be applied before VPP and removed after VPP. This voltage is supplied externally-no internal charge pump is present-and must be stabilized with a 0.1 µF capacitor between VPP and GND to suppress transients.
Does AT27C2048-55PU support in-system programming?
No, AT27C2048-55PU does not support in-system programming. It requires a dedicated EPROM programmer with VPP = 13.0 V capability and precise 50 µs PGM pulse generation. The device lacks serial interface or command-set protocols; programming occurs only in socketed or ZIF socket fixtures with full voltage and timing control.
Can AT27C2048-55PU be used as a direct replacement for AT27C1024-55PU?
No, AT27C2048-55PU is not a direct replacement for AT27C1024-55PU due to its expanded 17-bit address bus (A0–A16 vs. A0–A15) and higher pin count requirement for full 128K-word access. While both use 40-pin PDIP packages, A16 is an active input on AT27C2048-55PU and must be driven-not left floating-to avoid undefined behavior.
What is the purpose of the Integrated Product Identification Code in AT27C2048-55PU?
The Integrated Product Identification Code in AT27C2048-55PU provides two 16-bit words-manufacturer ID (001Eh) and device code (00F7h)-readable via A9 = 12.0 V and A0 toggling. This enables universal programmers to auto-detect the part number and apply correct algorithms, voltages, and verification patterns without manual configuration.
How does the dual-line control (CE and OE) improve system performance in AT27C2048-55PU?
The dual-line control in AT27C2048-55PU separates chip selection (CE) from output gating (OE), allowing address setup to begin before CE assertion and enabling OE to be delayed up to tACC − tOE after address validity. This overlap reduces effective read cycle time in burst-access systems and prevents bus contention when multiple memory devices share a data bus.
AT27C2048-55PU 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:
- 55 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 40-PDIP
AT27C2048-55PU FAQ
1.How can I place an order for AT27C2048-55PU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C2048-55PU 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 AT27C2048-55PU reliable?
The price and inventory of AT27C2048-55PU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C2048-55PU is usually 5 days.
3.What payment methods are accepted for AT27C2048-55PU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C2048-55PU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C2048-55PU?
AT27C2048-55PU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C2048-55PU 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 AT27C2048-55PU?
For technical support, including AT27C2048-55PU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C2048-55PU requirements.
6.How does Aetrix verify that AT27C2048-55PU is sourced from the original manufacturer or authorized distributors?
All AT27C2048-55PU 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 AT27C2048-55PU meets industry standards.
7.What is the process for return or replacement of AT27C2048-55PU?
All AT27C2048-55PU units undergo pre-shipment inspection (PSI). If there is an issue with AT27C2048-55PU, 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 AT27C2048-55PU part is unused and in its original packaging.
Return procedure for AT27C2048-55PU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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