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Microchip Technology AT27BV256-70RC
- Part No.:
- AT27BV256-70RC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-SOIC (0.342", 8.69mm Width)
- Datasheet:
-
AT27BV256-70RC.pdf
- Description:
- IC EPROM 256KBIT PARALLEL 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,373
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Product details
Overview
AT27BV256-70RC from Atmel is a 256K-bit (32K × 8) one-time programmable EPROM optimized for low-voltage battery-powered systems, featuring 70 ns read access time, dual supply operation (2.7–3.6V or 4.5–5.5V), and JEDEC-standard 28-lead SOIC packaging. It delivers TTL-compatible outputs at 3.0V and supports LVBO interface compliance at 2.7V, enabling direct integration into portable embedded controllers and legacy memory upgrade paths.
For engineers reviewing the AT27BV256-70RC datasheet, AT27BV256-70RC pinout, AT27BV256-70RC application, or AT27BV256-70RC equivalent, key selection criteria include unregulated battery voltage tolerance, rapid 100 µs/byte programming, <1 µA typical standby current at 3V, JEDEC pin compatibility with AT27C256R, and industrial temperature support (-40°C to +85°C).
Technical Context
The AT27BV256-70RC implements a CMOS OTP EPROM architecture with two-line control (CE/OE), supporting fast random-access reads and Rapid™ programming via VPP = 13.0V. Its dual-voltage design eliminates external regulation by accepting unregulated 2.7–3.6V battery input while maintaining TTL-level output drive at 3.0V.
It features integrated product identification code (Manufacturer ID = 0x1E, Device ID = 0x8C), 2,000V ESD protection, and 200 mA latchup immunity. Programming requires simultaneous VCC/VPP sequencing per JEDEC-compliant protocols, and system decoupling mandates a 0.1 µF ceramic capacitor between VCC and GND.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 262,144-bit (32K × 8) OTP EPROM - fixed content storage for boot code or firmware in space-constrained systems. |
| Read Access Time | 70 ns max at VCC = 2.7–3.6V - enables real-time execution from memory in microcontroller-based peripherals. |
| Supply Voltage Range | 2.7V–3.6V (unregulated battery) or 4.5V–5.5V - eliminates need for LDO in portable designs; supports dual-host insertion. |
| Standby Current | 20 µA max (≤1 µA typical at 3V) - extends battery life in always-on or sleep-mode applications. |
| Programming Speed | 100 µs/byte typical - reduces production programming time versus standard 5V EPROMs. |
| Operating Temperature | -40°C to +85°C - qualified for industrial-grade embedded control and automotive body electronics. |
| Package | 28-lead SOIC (0.330" wide, package code R) - surface-mount compatible with standard reflow profiles. |
Pinout & Package
AT27BV256-70RC is housed in a 28-lead, 0.330" wide plastic SOIC (package code R), JEDEC MS-012 compliant, with 1.27 mm lead pitch and gull-wing terminations.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus for selecting one of 32K bytes; CMOS/TTL compatible with VIH ≥ 0.7×VCC. |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus; outputs drive TTL loads at 3.0V and meet LVBO specs at 2.7V. |
| CE | Chip Enable | Active-low chip select; controls device activation and power state transitions (read/standby). |
| OE | Output Enable | Active-low output gate; allows bus sharing without contention when CE is active. |
| VCC | Power Supply | Main supply input (2.7–3.6V or 4.5–5.5V); must be applied before/with VPP during programming. |
| VPP | Programming Voltage | 13.0V ± 0.25V input for programming; requires dedicated 0.1 µF decoupling to ground. |
| GND | Ground Reference | Signal and power return path; decoupling capacitor must connect directly to this pin. |
Key Features
| Feature | Design Value |
|---|---|
| Unregulated Battery-Voltage™ Operation | Accepts 2.7–3.6V without regulation - simplifies power architecture in handheld instruments and remote sensors. |
| Rapid™ Programming Algorithm | 100 µs/byte typical - cuts programming time by >5× vs. conventional EPROMs, improving test throughput. |
| Integrated Product ID Code | Manufacturer ID 0x1E and Device ID 0x8C - enables automatic algorithm selection in universal programmers. |
| JEDEC Pin Compatibility | Direct replacement for AT27C256R in 28-pin SOIC footprint - no PCB redesign required for legacy upgrades. |
| Low-Power Standby Mode | <1 µA typical ICC at 3V - supports multi-year battery life in metering and IoT endpoint devices. |
Applications
| Portable Medical Instrumentation | Industrial PLC Firmware Storage |
|---|---|
|
Use Scenario: Battery-powered glucose meters and handheld diagnostic tools requiring nonvolatile firmware storage with minimal quiescent power draw. IC Role / Device Role / Timing Role: OTP EPROM storing boot loader and calibration tables; accessed during cold start with 70 ns latency. Use Value: Unregulated 2.7–3.6V operation eliminates DC/DC converter, reducing BOM cost and board area by ~30%. |
Use Scenario: Fixed-function logic controllers in factory automation where firmware must remain immutable across power cycles and environmental stress. IC Role / Device Role / Timing Role: Read-only memory holding ladder logic interpreter and I/O mapping; accessed synchronously with CPU clock. Use Value: -40°C to +85°C rating and 200 mA latchup immunity ensure reliable operation in electrically noisy plant-floor environments. |
| Legacy System Memory Upgrade | Automotive Body Control Module |
|
Use Scenario: Retrofitting aging industrial equipment originally designed for 5V AT27C256R with lower-power, battery-friendly alternatives. IC Role / Device Role / Timing Role: Pin-compatible drop-in replacement providing identical 28-pin SOIC footprint and timing interface. Use Value: JEDEC-compliant pinout and TTL-compatible outputs allow hardware reuse without layout changes or signal integrity revalidation. |
Use Scenario: Nonvolatile storage for seat/mirror position presets and lighting configuration in 12V vehicle subsystems with variable battery voltage. IC Role / Device Role / Timing Role: OTP memory holding user preferences and calibration offsets; powered directly from conditioned 3.3V rail. Use Value: 2.7–3.6V operating range accommodates brown-out conditions during engine cranking without data corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C256R-70PC | 5V-only operation (4.5–5.5V); no low-voltage mode; same 70 ns access, 28-pin PDIP package. | Requires regulated 5V supply; unsuitable for battery-powered systems with voltage droop. | Select when legacy 5V systems demand exact form-fit-function replacement with no voltage flexibility needed. |
| AT27LV256A-70PC | 3.3V-only operation (2.7–3.6V); identical timing and pinout; PDIP package; lacks VPP programming pin. | No high-voltage programming support; relies on external programmer for 12V pulses. | Choose for cost-sensitive 3.3V-only designs where VPP circuitry adds complexity, but verify programmer compatibility. |
Compared with AT27C256R-70PC and AT27LV256A-70PC, the AT27BV256-70RC uniquely bridges dual-supply operation-supporting both unregulated battery inputs and 5V hosts-while retaining full programming compatibility and industrial temperature range, making it the only option for field-upgradeable portable systems requiring guaranteed OTP integrity.
Availability
AT27BV256-70RC is available at Aetrix Electronics and suitable for portable instrumentation, industrial control firmware storage, and automotive body electronics requiring stable component supply across extended lifecycle demands.
Supply support for AT27BV256-70RC 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 embedded systems.
The AT27BV256 product line was engineered for low-power, battery-operated embedded applications requiring reliable OTP storage without voltage regulation-targeting medical devices, industrial HMIs, and automotive subsystems.
FAQ
What is the maximum operating voltage for AT27BV256-70RC during normal read operation?
The AT27BV256-70RC supports two distinct read supply ranges: 2.7V to 3.6V for low-voltage battery operation and 4.5V to 5.5V for standard 5V systems. It does not operate at voltages outside these ranges during read mode. The 70 ns access time is guaranteed across the full 2.7–3.6V range, and the device maintains TTL-compatible outputs at 3.0V. Exceeding 5.5V or dropping below 2.7V risks functional failure or damage.
Does AT27BV256-70RC require external high-voltage circuitry for programming?
Yes, the AT27BV256-70RC requires VPP = 13.0V ± 0.25V for programming, supplied externally through the dedicated VPP pin. This voltage must be sequenced with VCC (applied simultaneously or before VPP) and decoupled with a 0.1 µF ceramic capacitor to ground. Standard 5V programmers cannot program AT27BV256-70RC without added VPP generation capability, unlike the AT27LV256A which uses internal charge pumps.
Is AT27BV256-70RC pin-compatible with AT27C256R in the same SOIC package?
Yes, AT27BV256-70RC is JEDEC-pin-compatible with AT27C256R in the 28-lead SOIC (package code R) configuration. All signal pins-including A0–A14, O0–O7, CE, OE, VCC, GND, and VPP-map identically. However, AT27C256R lacks VPP and operates at 5V only, so direct substitution requires verifying that the host system can supply 13.0V to VPP and tolerate dual-voltage signaling.
What decoupling capacitors are mandatory for stable operation of AT27BV256-70RC?
A 0.1 µF high-frequency ceramic capacitor must be placed between VCC and GND, as close as possible to the AT27BV256-70RC pins, to suppress transient voltage excursions during CE toggling. For systems with multiple AT27BV256-70RC devices or large EPROM arrays, a 4.7 µF bulk electrolytic capacitor is also required between VCC and GND near the power entry point to stabilize the supply rail under dynamic load.
How does the Integrated Product Identification Code function in AT27BV256-70RC?
The AT27BV256-70RC embeds a two-byte identification code: Manufacturer ID = 0x1E and Device ID = 0x8C. These are read by asserting VIL on all address lines except A9 (set to 12.0V) and toggling A0 to select byte order. Industry-standard programmers use this code to auto-detect the device and apply correct programming algorithms and voltage profiles-ensuring reliable programming without manual configuration.
AT27BV256-70RC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 28-SOIC (0.342", 8.69mm Width)
- Packaging:
- Tube
- 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:
- 70 ns
- Voltage - Supply:
- 2.7V ~ 3.6V, 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOIC
AT27BV256-70RC FAQ
1.How can I place an order for AT27BV256-70RC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27BV256-70RC 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 AT27BV256-70RC reliable?
The price and inventory of AT27BV256-70RC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27BV256-70RC is usually 5 days.
3.What payment methods are accepted for AT27BV256-70RC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27BV256-70RC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27BV256-70RC?
AT27BV256-70RC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27BV256-70RC 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 AT27BV256-70RC?
For technical support, including AT27BV256-70RC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27BV256-70RC requirements.
6.How does Aetrix verify that AT27BV256-70RC is sourced from the original manufacturer or authorized distributors?
All AT27BV256-70RC 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 AT27BV256-70RC meets industry standards.
7.What is the process for return or replacement of AT27BV256-70RC?
All AT27BV256-70RC units undergo pre-shipment inspection (PSI). If there is an issue with AT27BV256-70RC, 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 AT27BV256-70RC part is unused and in its original packaging.
Return procedure for AT27BV256-70RC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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