My Inquiry
My Account
Microchip Technology AT27C2048-90PU
- Part No.:
- AT27C2048-90PU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 40-DIP (0.600", 15.24mm)
- Datasheet:
-
AT27C2048-90PU.pdf
- Description:
- IC EPROM 2MBIT PARALLEL 40DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,758
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT27C2048-90PU 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 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.
For engineers reviewing the AT27C2048-90PU datasheet, AT27C2048-90PU pinout, AT27C2048-90PU application, or AT27C2048-90PU equivalent, key selection criteria include JEDEC-standard PDIP compatibility, dual-line control (CE/OE), CMOS/TTL I/O compatibility, standby current ≤100 µA, and OTP reliability for firmware storage in legacy embedded systems.
Technical Context
The AT27C2048-90PU implements a 128K × 16-bit memory array with address decoding logic, output buffers, and integrated product ID circuitry. Its two-line control architecture (CE and OE) eliminates bus contention in high-speed systems, while the PGM pin enables rapid programming under 13.0V VPP.
It operates in five distinct modes-Read, Output Disable, Standby, Rapid Program, and Product Identification-each defined by specific voltage levels on CE, OE, PGM, and A9. The device uses high-reliability CMOS technology with 2,000V ESD protection and 200 mA latchup immunity, ensuring robustness in industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2,097,152 bits (128K words × 16 bits) - supports full 16-bit data bus interface without byte-wide splitting |
| Read Access Time | 90 ns max - eliminates WAIT states in 5 MHz microprocessor systems |
| Supply Voltage | 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 intermittent-operation systems |
| Active Current | 35 mA max at 5 MHz - defines thermal budget and decoupling capacitor sizing (0.1 µF ceramic + 4.7 µF bulk) |
| Programming Voltage | VPP = 13.0 ±0.25V - requires external high-voltage supply during programming; VCC must be applied before/removed after VPP |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded control and instrumentation applications |
Pinout & Package
AT27C2048-90PU is supplied in a 40-lead PDIP (Package Code 40P6), 0.600" wide, JEDEC MS-011 compliant package. Both GND pins (Pin 12 and Pin 27) must be connected to system ground for proper operation and noise immunity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting 128K-word addressing; A0–A16 fully decoded internally |
| O0–O15 | Data Outputs | 16-bit bidirectional data bus; outputs driven only when CE = VIL and OE = VIL |
| CE | Chip Enable | Primary device select; controls active/standby state transition and initiates programming when combined with PGM |
| OE | Output Enable | Secondary output gate; allows multiple devices on same data bus without contention when OE = VIH |
| PGM | Program Strobe | Active-low signal enabling rapid programming mode; must be VIL during programming pulses |
| VPP | Programming Voltage | 13.0V input for programming; requires 0.1 µF capacitor to ground to suppress transients |
| VCC | Power Supply | 5V supply for read/standby; must be applied before and removed after VPP during programming |
| GND (Pins 12, 27) | Ground Reference | Dual ground pins reduce ground bounce and improve signal integrity in high-speed read cycles |
Key Features
| Feature | Design Value |
|---|---|
| Rapid Programming Algorithm | 50 µs/word typical - reduces firmware update time and improves production throughput vs. legacy EPROMs |
| Integrated Product ID Code | Manufacturer ID 001Eh and Device ID 00F7h - enables automatic algorithm selection in industry-standard programmers |
| Two-Line Control (CE/OE) | Independent chip and output enable - permits interleaved access and clean bus sharing in multi-device memory maps |
| CMOS/TTL Compatibility | VIL ≤0.8V, VIH ≥2.0V, VOL ≤0.4V, VOH ≥2.4V - ensures interoperability with both logic families without level-shifting |
| High Reliability Design | 2,000V HBM ESD rating and 200 mA latchup immunity - sustains operation in electrically noisy industrial enclosures |
Applications
| Industrial PLC Firmware Storage | Legacy Medical Instrument Boot Memory |
|---|---|
Use Scenario: Storing fixed boot code and calibration tables in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Non-volatile firmware ROM providing deterministic 90 ns read access to initialize CPU and I/O peripherals at power-up. Use Value: Eliminates reliance on slower serial EEPROM or external flash; supports direct execution from memory (XIP) in 16-bit microcontrollers. |
Use Scenario: Holding safety-critical diagnostic routines and sensor calibration constants in Class II medical devices requiring long-term data retention. IC Role / Device Role / Timing Role: OTP EPROM used as immutable configuration store; programmed once during manufacturing and never rewritten in field. Use Value: Guarantees firmware integrity over 10+ year service life; immune to accidental overwrite or radiation-induced bit flips common in flash. |
| Military Avionics Boot ROM | Test Equipment Microcode Repository |
Use Scenario: Hosting bootloader and FPGA configuration bitstreams in airborne mission computers operating across −40°C to +85°C. IC Role / Device Role / Timing Role: High-reliability read-only memory interfaced directly to MIL-STD-1553 or ARINC-429 controller buses. Use Value: Meets DO-254 design assurance requirements via proven OTP process; no wear-out mechanism or erase-cycle limitations. |
Use Scenario: Storing instrument-specific microcode and self-test algorithms in automated test equipment (ATE) platforms. IC Role / Device Role / Timing Role: Fixed-function memory mapped into CPU address space to accelerate pattern generation and measurement sequencing. Use Value: Enables sub-microsecond instruction fetch latency critical for real-time waveform synthesis and response validation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C2048-90JI | Same die, 44-lead PLCC package (44J); higher pin count, surface-mount compatible | Used where board space constraints favor compact footprint and reflow assembly over through-hole PDIP | Select AT27C2048-90JI for SMT production lines; AT27C2048-90PU remains optimal for prototyping, repair, and legacy through-hole designs. |
| AT27C1024-90PU | 1-Mbit (64K × 16) density; identical timing (90 ns), package (40P6), and programming architecture | Suitable for systems with smaller firmware images where 2-Mbit capacity is unnecessary | Choose AT27C1024-90PU to reduce cost and power when firmware fits within 64K words; verify address decoding matches reduced A16 requirement. |
Compared with AT27C2048-90PU, the AT27C2048-90JI offers identical functionality in a space-saving PLCC package but requires reflow soldering and different PCB layout, while AT27C1024-90PU provides half the memory capacity at lower cost and power-ideal for firmware-limited legacy systems where scalability is not required.
Availability
AT27C2048-90PU is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy medical instrument boot memory, military avionics boot ROM, and test equipment microcode repository applications requiring stable component supply and long-term obsolescence support.
Supply support for AT27C2048-90PU 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 ICs for industrial, automotive, and consumer applications.
The AT27C2048 belongs to Atmel's OTP EPROM product line, designed specifically for reliable, high-density, pin-compatible upgrades of legacy 512-Kbit and 1-Mbit EPROMs in mature embedded systems requiring zero-risk firmware persistence.
FAQ
What is the maximum read access time specified for the AT27C2048-90PU?
The AT27C2048-90PU has a maximum read access time of 90 ns under industrial temperature conditions (−40°C to +85°C) and 5V ±10% supply. This value is guaranteed across all operating corners and defines the minimum time between address valid and valid data appearing on O0–O15. The AT27C2048-90PU achieves this performance without requiring WAIT states in 5 MHz microprocessor systems.
Does the AT27C2048-90PU require a high-voltage supply for normal read operation?
No, the AT27C2048-90PU operates in read mode using only a single 5V ±10% supply (VCC). The VPP pin is disconnected or tied to VCC during read/standby and is only activated at 13.0V ±0.25V during programming. The AT27C2048-90PU's design isolates VPP from the core logic during read, eliminating risk of accidental programming or voltage stress.
How many ground connections does the AT27C2048-90PU PDIP package require?
The AT27C2048-90PU in 40-lead PDIP (40P6) package has two dedicated GND pins: Pin 12 and Pin 27. Both must be connected to the system ground plane to ensure stable operation, minimize ground bounce during high-speed reads, and meet ESD/latchup immunity specifications. Failure to connect either GND pin may result in timing violations or functional failure.
Can the AT27C2048-90PU be used as a drop-in replacement for the AT27C1024-90PU?
The AT27C2048-90PU is not a drop-in replacement for the AT27C1024-90PU due to its extended address range (A16 required) and larger memory map. While both share identical timing, package, and I/O characteristics, the AT27C2048-90PU requires A16 to be driven and occupies twice the address space. System redesign is needed to accommodate the additional address bit and updated memory mapping.
What is the purpose of the Integrated Product Identification Code in the AT27C2048-90PU?
The AT27C2048-90PU includes an Integrated Product Identification Code that returns Manufacturer ID 001Eh and Device ID 00F7h when A9 is set to 12.0V and A0 is toggled. This feature allows industry-standard programmers to auto-detect the device type and apply correct programming algorithms and voltages, reducing setup errors and improving yield during firmware programming of the AT27C2048-90PU.
AT27C2048-90PU 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:
- 90 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
AT27C2048-90PU FAQ
1.How can I place an order for AT27C2048-90PU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C2048-90PU 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 AT27C2048-90PU reliable?
The price and inventory of AT27C2048-90PU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C2048-90PU is usually 5 days.
3.What payment methods are accepted for AT27C2048-90PU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C2048-90PU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C2048-90PU?
AT27C2048-90PU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C2048-90PU 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 AT27C2048-90PU?
For technical support, including AT27C2048-90PU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C2048-90PU requirements.
6.How does Aetrix verify that AT27C2048-90PU is sourced from the original manufacturer or authorized distributors?
All AT27C2048-90PU 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 AT27C2048-90PU meets industry standards.
7.What is the process for return or replacement of AT27C2048-90PU?
All AT27C2048-90PU units undergo pre-shipment inspection (PSI). If there is an issue with AT27C2048-90PU, 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 AT27C2048-90PU part is unused and in its original packaging.
Return procedure for AT27C2048-90PU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT27C2048-90PU Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
