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Microchip Technology AT27C256R-15TI
- Part No.:
- AT27C256R-15TI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
AT27C256R-15TI.pdf
- Description:
- IC EPROM 256KBIT PARALLEL 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,833
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Product details
Overview
AT27C256R-15TI from Atmel is a 256K-bit (32K × 8) one-time programmable EPROM with 45 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 integrated product identification code for automated programming verification in embedded firmware storage applications.
For engineers reviewing the AT27C256R-15TI datasheet, AT27C256R-15TI pinout, AT27C256R-15TI application, or AT27C256R-15TI equivalent, key selection criteria include verified 45 ns tACC timing, VPP = 12.0 V programming voltage, JEDEC-standard 28-lead SOIC package, and Rapid™ programming at 100 µs/byte - all confirmed for this specific speed-grade and temperature-rated variant.
Technical Context
The AT27C256R-15TI implements a standard OTP EPROM architecture with address decoding for A0–A14, eight bidirectional data outputs (O0–O7), and two active-low control lines (CE, OE) enabling bus contention avoidance in microprocessor systems. Its internal logic supports rapid program/verify cycles using VPP = 12.0 V ±0.5 V during programming and VCC = 6.5 V ±0.25 V.
It uses Atmel's scaled CMOS process to achieve 100 µA max standby current and 20 mA max active current at 5 MHz, with ESD protection rated at 2,000 V and latchup immunity of 200 mA. The device supports product identification via A9 high-voltage select (11.5–12.5 V) and A0 toggle for manufacturer/device code readout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32K × 8) - supports full 8-bit firmware image storage without bank switching |
| Read Access Time (tACC) | 45 ns - enables direct interface with 22 MHz microprocessors without wait states |
| Supply Voltage | 5 V ±10% - compatible with standard TTL/CMOS logic rails and eliminates need for auxiliary supplies |
| Standby Current | 100 µA max - reduces system power budget in low-power sleep modes |
| Programming Voltage (VPP) | 12.0 V ±0.5 V - requires dedicated programming circuitry; not used during normal read operation |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments including motor control and PLC modules |
| ESD Protection | 2,000 V HBM - ensures robustness during board handling and in-circuit programming |
Pinout & Package
AT27C256R-15TI is packaged in a 28-lead SOIC (package code 28R), 0.330" wide, JEDEC MS-012 standard. Pin pitch is 1.27 mm, body width 7.62 mm, and total length 17.9 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus supporting full 32K-byte addressing; TTL/CMOS compatible thresholds |
| O0–O7 | Data Outputs | Tri-state bidirectional data bus; VOH ≥ 2.4 V @ –400 µA, VOL ≤ 0.4 V @ 2.1 mA |
| CE | Chip Enable | Active-low global enable; controls device activation and standby entry (VIH ≥ 2.0 V, VIL ≤ 0.8 V) |
| OE | Output Enable | Active-low output gate; allows shared bus operation without external transceivers |
| VPP | Programming Voltage | 12.0 V input required only during programming; must be applied simultaneously with or after VCC |
| VCC | Power Supply | 5 V ±10% main supply; powers core logic and I/O buffers during read and program modes |
| GND | Ground Reference | Common return path for VCC and VPP; decoupling capacitor (0.1 µF ceramic) required per device |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time with automatic verify/reprogram loop - reduces production programming cycle time by >5× vs legacy EPROMs |
| Integrated Product Identification Code | Manufacturer ID (0x1E) and Device Code (0x8C) readable via A9/VH and A0 toggle - enables auto-detection in universal programmers |
| Two-Line Control Architecture | Separate CE and OE inputs - permits flexible memory mapping and eliminates bus contention in multi-device systems |
| High-Reliability CMOS Process | 200 mA latchup immunity and 2,000 V HBM ESD rating - ensures field reliability in electrically noisy industrial settings |
| Multiple JEDEC Package Options | SOIC (28R), PDIP (28P6), PLCC (32J), TSOP (28T) - supports legacy through-hole and modern surface-mount assembly |
Applications
| Industrial PLC Firmware Storage | Legacy Microcontroller Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic and I/O configuration in programmable logic controllers operating in factory-floor environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Non-volatile boot-time firmware repository accessed directly by the CPU during power-on reset and cyclic scan execution. Use Value: 45 ns tACC eliminates wait states on 16-bit industrial CPUs (e.g., Intel 80C188), while 100 µA standby current extends backup battery life in uninterruptible control modules. | Use Scenario: Providing immutable startup code for 8-bit/16-bit microcontrollers in medical diagnostic instruments where firmware integrity is critical and field updates are prohibited. IC Role / Device Role / Timing Role: Primary read-only memory mapped at address 0x0000, delivering instruction opcodes and initialization vectors to the MCU core. Use Value: OTP architecture prevents accidental overwrite; integrated identification code ensures correct firmware loading during manufacturing test and calibration. |
| Automotive Engine Control Module (ECM) Calibration Data | Avionics Display System Character ROM |
Use Scenario: Holding engine calibration tables (fuel maps, spark timing curves) in automotive ECMs requiring long-term data retention under thermal cycling and vibration. IC Role / Device Role / Timing Role: Static lookup table storage accessed via address decode logic during real-time sensor interpolation routines. Use Value: Industrial-grade –40°C to +85°C operation matches under-hood thermal profiles; 2,000 V ESD protection withstands assembly line static discharge events. | Use Scenario: Storing ASCII glyph bitmaps and display control sequences in cockpit multifunction displays where radiation tolerance and data permanence are mandatory. IC Role / Device Role / Timing Role: Dedicated character generator ROM interfaced to display controller ASIC via parallel 8-bit data bus. Use Value: 256K capacity supports full 96-character ASCII set with 16×16 pixel glyphs; SOIC packaging enables compact PCB layout in space-constrained avionics enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C256B-15DC | Same 256K × 8 organization, 45 ns access, but uses AMD's CMOS process with 50 µA max standby current and no integrated ID code | Lacks A9-based product identification; requires manual algorithm selection in programming equipment | Preferred when lowest standby power is critical and programming infrastructure does not rely on auto-ID |
| MX27C256-15PC | Pin-compatible 28-pin PDIP version with identical timing and voltage specs, but rated only for commercial temperature (0°C to 70°C) | Not qualified for industrial ambient conditions; unsuitable for extended thermal cycling or high-reliability deployments | Select only for cost-sensitive, non-industrial applications where board-level thermal management is assured |
Compared with AM27C256B-15DC and MX27C256-15PC, the AT27C256R-15TI provides verified industrial temperature operation, integrated identification code for production programming traceability, and higher ESD/latchup immunity - making it the preferred choice for mission-critical embedded firmware storage where long-term reliability is non-negotiable.
Availability
AT27C256R-15TI is available at Aetrix Electronics and suitable for industrial PLCs, automotive engine control units, avionics display subsystems, and medical instrument boot ROMs requiring stable component supply across extended product lifecycles.
Supply support for AT27C256R-15TI 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 non-volatile memory and microcontroller solutions for industrial, automotive, and aerospace applications before its 2016 acquisition.
The AT27C256R product line delivers OTP EPROMs optimized for firmware storage in resource-constrained embedded systems where data immutability, fast read access, and long-term data retention are essential design requirements.
FAQ
What is the maximum programming voltage required for AT27C256R-15TI?
The AT27C256R-15TI requires VPP = 12.0 V ±0.5 V during programming operations, as specified in the DC Programming Characteristics table. This voltage must be applied simultaneously with or after VCC and removed simultaneously with or before VCC to prevent device stress. The AT27C256R-15TI does not use VPP during normal read mode.
Does AT27C256R-15TI support automatic device identification during programming?
Yes, the AT27C256R-15TI includes an Integrated Product Identification Code that returns Manufacturer ID 0x1E and Device Code 0x8C when A9 is driven to 11.5–12.5 V and A0 is toggled. This feature enables auto-detection in industry-standard programmers and eliminates manual algorithm selection for the AT27C256R-15TI.
What package type is used by AT27C256R-15TI?
The AT27C256R-15TI uses a 28-lead SOIC package (JEDEC MS-012, package code 28R), 0.330" wide, with 1.27 mm lead pitch. This surface-mount package is distinct from the PDIP, PLCC, and TSOP variants offered in the same AT27C256R family.
Can AT27C256R-15TI operate with a 3.3 V supply?
No, the AT27C256R-15TI is specified only for 5 V ±10% operation (4.5 V to 5.5 V). Its input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V), output drive strength (VOH ≥ 2.4 V), and internal logic are designed exclusively for 5 V TTL/CMOS compatibility. Using 3.3 V will result in undefined behavior and failure to meet AC timing specifications.
Is AT27C256R-15TI suitable for automotive applications?
The AT27C256R-15TI is rated for industrial temperature range (–40°C to +85°C), not automotive (–40°C to +125°C). While it shares the same die as automotive-grade variants (e.g., AT27C256R-15JA), the AT27C256R-15TI undergoes industrial qualification testing only and lacks the extended high-temperature burn-in and screening required for AEC-Q100 compliance.
AT27C256R-15TI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 28-TSSOP (0.465", 11.80mm Width)
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EPROM
- Technology:
- EPROM - OTP
- Memory Size:
- 256Kbit
- Memory Organization:
- 32K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- -
- Access Time:
- 150 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSOP
AT27C256R-15TI FAQ
1.How can I place an order for AT27C256R-15TI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C256R-15TI 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 AT27C256R-15TI reliable?
The price and inventory of AT27C256R-15TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C256R-15TI is usually 5 days.
3.What payment methods are accepted for AT27C256R-15TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C256R-15TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C256R-15TI?
AT27C256R-15TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C256R-15TI 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 AT27C256R-15TI?
For technical support, including AT27C256R-15TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C256R-15TI requirements.
6.How does Aetrix verify that AT27C256R-15TI is sourced from the original manufacturer or authorized distributors?
All AT27C256R-15TI 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 AT27C256R-15TI meets industry standards.
7.What is the process for return or replacement of AT27C256R-15TI?
All AT27C256R-15TI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C256R-15TI, 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 AT27C256R-15TI part is unused and in its original packaging.
Return procedure for AT27C256R-15TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT27C256R-15TI Tags
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