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Microchip Technology AT27C2048-70JI
- Part No.:
- AT27C2048-70JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
AT27C2048-70JI.pdf
- Description:
- IC EPROM 2MBIT PARALLEL 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,035
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Product details
Overview
AT27C2048-70JI from Atmel is a 2-Mbit (128K × 16) one-time programmable EPROM with 55 ns read access time, 5V ±10% supply operation, and industrial temperature range (–40°C to +85°C). It features dual-line control (CE/OE), CMOS/TTL-compatible I/O, and rapid programming at 50 µs/word - enabling direct firmware storage in 16/32-bit microprocessor systems without wait states.
For engineers reviewing the AT27C2048-70JI datasheet, AT27C2048-70JI pinout, AT27C2048-70JI application, or AT27C2048-70JI equivalent, key selection criteria include its OTP architecture, 40-pin VSOP/PDIP/PLCC package options, 100 µA max standby current, 35 mA active current at 5 MHz, and compatibility with legacy AT27C516/AT27C1024 designs.
Technical Context
The AT27C2048-70JI implements a standard OTP EPROM architecture with X/Y decoding, output buffers, and integrated product identification logic. Its two-line enable scheme (CE and OE) enables bus contention avoidance in high-speed systems, while the Rapid™ programming algorithm uses precise 50 µs CE pulses at VPP = 13.0 V and VCC = 6.5 V for reliable word-level programming.
It supports both CMOS and TTL input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V), delivers VOH ≥ 2.4 V at –400 µA, and maintains VOL ≤ 0.4 V at 2.1 mA sink. The device includes on-chip ESD protection (2,000 V) and latchup immunity (200 mA), with absolute maximum ratings specifying –2.0 V to +7.0 V on all pins except A9 and VPP (–2.0 V to +14.0 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2,097,152 bits (128K × 16 organization) - supports 16-bit data bus interface without byte-wide splitting. |
| Read Access Time | 70 ns (max) - guarantees sub-14.3 MHz system clock compatibility without WAIT state insertion. |
| Supply Voltage | 5 V ±10% - operates from standard logic rail; no auxiliary voltage required in read mode. |
| Standby Current | 100 µA (max) - enables low-power retention in battery-backed or intermittent-access systems. |
| Active Current | 35 mA (max at 5 MHz) - defines thermal budget and decoupling requirements for sustained read bursts. |
| Programming Speed | 50 µs/word (typical) - reduces firmware burn time by >90% vs. legacy EPROM algorithms. |
| Operating Temperature | –40°C to +85°C - qualified for industrial control, motor drives, and embedded instrumentation. |
Pinout & Package
AT27C2048-70JI is supplied in a 40-lead VSOP (10 mm × 14 mm) package per JEDEC MO-142 CA. All 40 pins are electrically assigned; no NC or DC pins present in this variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting full 128K-word addressing; A0 LSB, A16 MSB. |
| O0–O15 | Data Outputs | 16-bit bidirectional data path; outputs driven only when CE = OE = low. |
| CE | Chip Enable | Primary device select; high-Z outputs when CE high, regardless of OE state. |
| OE | Output Enable | Secondary output gate; controls data bus drive timing independently of CE. |
| PGM | Program Strobe | Active-low pulse input triggering 50 µs programming cycle under VPP = 13 V. |
| VPP | Programming Voltage | 13.0 V ±0.25 V input during programming; must be applied after and removed before VCC. |
| VCC | Power Supply | 5 V ±10% supply; powers logic and outputs; requires 0.1 µF ceramic decoupling at pin. |
| GND (×2) | Ground | Both GND pins must be connected to common system ground plane for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 50 µs/word typical programming time with auto-verify loop - eliminates manual reprogramming and reduces production test time. |
| Integrated Product ID Code | Manufacturer ID (001Eh) and Device Code (00F7h) readable via A9 = 12 V and A0 toggling - enables automated programmer recognition and algorithm selection. |
| Two-Line Control (CE/OE) | Independent chip and output enables - prevents bus contention during partial memory accesses and multi-device sharing. |
| CMOS/TTL Compatibility | VIL ≤ 0.8 V and VIH ≥ 2.0 V inputs; VOH ≥ 2.4 V and VOL ≤ 0.4 V outputs - interoperates with both logic families without level shifters. |
| High Reliability Design | 2,000 V HBM ESD rating and 200 mA latchup immunity - sustains robust operation in noisy industrial environments. |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded System Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic and I/O mapping tables in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Nonvolatile boot-time firmware repository accessed at power-up and during firmware updates. Use Value: 70 ns access time ensures deterministic scan-cycle timing; OTP security prevents unauthorized firmware modification. |
Use Scenario: Replacing obsolete EPROMs in aging medical devices, telecom line cards, and test equipment requiring field-replaceable firmware. IC Role / Device Role / Timing Role: Pin-compatible upgrade path for AT27C516 and AT27C1024 in existing 16-bit bus designs. Use Value: Direct drop-in replacement with identical pinout and timing margins - avoids PCB redesign and qualification delays. |
| Motor Drive Parameter Tables | Avionics Configuration Memory |
Use Scenario: Holding calibrated PWM lookup tables, thermal derating curves, and safety interlock parameters in brushless DC motor controllers. IC Role / Device Role / Timing Role: Read-only configuration store accessed during initialization and runtime parameter interpolation. Use Value: Industrial temperature rating (–40°C to +85°C) and 100 µA standby current support operation in thermally constrained enclosures. |
Use Scenario: Storing flight-critical configuration data (e.g., sensor calibration offsets, fail-safe defaults) in certified avionics subsystems. IC Role / Device Role / Timing Role: Tamper-resistant, radiation-tolerant nonvolatile memory for immutable system settings. Use Value: OTP architecture provides permanent write-protection; 2,000 V ESD rating enhances resilience against electrostatic discharge in aircraft bays. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C020-70JU | 2-Mbit (256K × 8) organization; 44-pin PLCC only; no VSOP option; 70 ns access same. | Requires 8-bit data bus interface; incompatible with 16-bit microprocessor systems without glue logic. | Select only if system uses 8-bit bus or space allows PLCC footprint and bus-width adaptation. |
| MX27C2048-70PC | Same 128K × 16 organization and 70 ns speed; PDIP-only; different manufacturer ID and programming voltage tolerance (VPP = 12.5 V ±0.5 V). | Identical functional behavior in read mode; requires validation of programmer compatibility for VPP timing and voltage accuracy. | Use where PDIP is mandatory and Atmel-specific ID features (e.g., product code readback) are not required. |
Compared with AT27C2048-70JI, AT27C020-70JU shifts data width from 16 to 8 bits - increasing bus cycles per instruction fetch - while MX27C2048-70PC retains identical functionality but lacks integrated product identification, limiting automated programming ecosystem support.
Availability
AT27C2048-70JI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded system boot ROM upgrades, and motor drive parameter table applications requiring stable component supply across extended lifecycle programs.
Supply support for AT27C2048-70JI 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 was a U.S.-based semiconductor company specializing in microcontrollers, nonvolatile memory, and programmable logic, acquired by Microchip Technology in 2016.
The AT27C2048 series was designed as a high-reliability, industrial-grade OTP EPROM family targeting firmware storage in mission-critical embedded systems where reprogrammability is unnecessary but long-term data integrity is essential.
FAQ
What is the operating temperature range for the AT27C2048-70JI?
The AT27C2048-70JI is rated for industrial operation from –40°C to +85°C. This range is validated per the device's DC and AC specifications, including standby current (ISB2 ≤ 1 mA), read timing (tACC ≤ 70 ns), and input/output voltage thresholds across the full span. The "I" suffix in AT27C2048-70JI explicitly denotes this industrial grade, distinguishing it from commercial-grade variants like AT27C2048-70JC.
Does the AT27C2048-70JI require a programming voltage (VPP) during normal read operation?
No, the AT27C2048-70JI operates in read mode using only a 5 V ±10% VCC supply; VPP is disconnected or tied to VCC (5 V) and plays no role. VPP = 13.0 V ±0.25 V is required exclusively during programming, and must be applied after VCC and removed before VCC per datasheet sequencing rules. Applying 13 V during read risks exceeding absolute maximum ratings and damaging the device.
Can the AT27C2048-70JI be used as a direct replacement for AT27C1024 in an existing design?
Yes, the AT27C2048-70JI is specified as a direct upgrade from AT27C1024 (1-Mbit) and AT27C516 (512-Kbit) EPROMs. It shares identical pinout, 5 V supply, CE/OE control protocol, and timing compatibility - with the sole difference being doubled capacity (128K × 16 vs. 64K × 16). Address lines A16 and data bits O8–O15 become active; unused upper address bits in legacy designs remain unconnected without impact.
What decoupling capacitance is required for stable operation of the AT27C2048-70JI?
The AT27C2048-70JI requires a 0.1 µF high-frequency ceramic capacitor placed between VCC and GND, mounted as close as possible to the device pins. For systems with multiple EPROMs, a 4.7 µF bulk electrolytic capacitor should also be added near the power entry point. These values are mandated in the "System Considerations" section to suppress transient excursions caused by CE switching and ensure VCC remains within ±10% during active read cycles.
How is the Integrated Product Identification Code accessed on the AT27C2048-70JI?
The AT27C2048-70JI's identification code is read by setting A9 to 12.0 V ±0.5 V (VID), holding A1–A16 low, and toggling A0: A0 = VIL reads the Manufacturer ID (001Eh), and A0 = VIH reads the Device Code (00F7h). This occurs during a standard read cycle with CE = OE = VIL. The feature enables automatic detection by industry-standard programmers and eliminates manual part selection errors during production programming.
AT27C2048-70JI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 44-LCC (J-Lead)
- 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:
- 70 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 44-PLCC (16.6x16.6)
AT27C2048-70JI FAQ
1.How can I place an order for AT27C2048-70JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C2048-70JI 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 AT27C2048-70JI reliable?
The price and inventory of AT27C2048-70JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C2048-70JI is usually 5 days.
3.What payment methods are accepted for AT27C2048-70JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C2048-70JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C2048-70JI?
AT27C2048-70JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C2048-70JI 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 AT27C2048-70JI?
For technical support, including AT27C2048-70JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C2048-70JI requirements.
6.How does Aetrix verify that AT27C2048-70JI is sourced from the original manufacturer or authorized distributors?
All AT27C2048-70JI 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 AT27C2048-70JI meets industry standards.
7.What is the process for return or replacement of AT27C2048-70JI?
All AT27C2048-70JI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C2048-70JI, 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 AT27C2048-70JI part is unused and in its original packaging.
Return procedure for AT27C2048-70JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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