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Microchip Technology AT27BV256-70RU
- Part No.:
- AT27BV256-70RU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-SOIC (0.342", 8.69mm Width)
- Datasheet:
-
AT27BV256-70RU.pdf
- Description:
- IC EPROM 256KBIT PARALLEL 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,746
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Product details
Overview
AT27BV256-70RU from Atmel is a 256K-bit (32K × 8) one-time programmable EPROM optimized for low-voltage portable systems, featuring 70 ns read access time, dual-voltage operation (2.7–3.6V or 4.5–5.5V), and JEDEC-standard 28-pin TSOP packaging. It delivers TTL-compatible outputs at 3.0V and LVBO compliance at 2.7V, enabling direct integration into battery-powered embedded controllers and memory-mapped peripherals.
For engineers reviewing the AT27BV256-70RU datasheet, AT27BV256-70RU pinout, AT27BV256-70RU application, or AT27BV256-70RU equivalent, key selection criteria include unregulated battery voltage support, rapid 100 µs/byte programming, 20 µA max standby current at 3.6V, JEDEC pin compatibility with AT27C256R, and industrial temperature range (-40°C to +85°C) operation.
Technical Context
The AT27BV256-70RU implements a CMOS OTP EPROM architecture with two-line control (CE/OE), supporting fast random-access reads and Rapid™ programming using VPP = 13.0V and VCC = 6.5V. Its dual-supply design allows seamless operation across 3V and 5V host systems without level-shifting circuitry.
It features integrated product identification code (Manufacturer ID = 0x1E, Device ID = 0x8C), 2,000V ESD protection, and 200 mA latchup immunity. The device uses standard JEDEC-compliant timing references (0.8V/2.0V) and requires a 0.1 µF ceramic capacitor between VCC and GND for transient suppression during CE transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 262,144 bits (32K × 8), enabling full 8-bit microcontroller code storage without bank switching |
| Read Access Time | 70 ns max at VCC = 2.7–3.6V, matching performance of legacy 5V EPROMs in low-power systems |
| Supply Voltage Range | 2.7V–3.6V (unregulated battery) or 4.5V–5.5V (standard 5V), eliminating need for voltage regulators in portable designs |
| Standby Current | 20 µA max at VCC = 3.6V, extending battery life in always-on embedded applications |
| Programming Speed | 100 µs/byte typical with Rapid™ algorithm, reducing production programming time vs. conventional EPROMs |
| Operating Temperature | -40°C to +85°C, qualified for industrial-grade environmental resilience |
| Output Compatibility | TTL-level outputs at VCC = 3.0V; LVBO-compliant at VCC = 2.7V, ensuring interoperability with mixed-voltage logic |
Pinout & Package
AT27BV256-70RU is housed in a 28-lead plastic thin small outline package (TSOP), JEDEC-standard Type 1, 8.1 mm × 13.7 mm footprint with 0.55 mm pitch gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus supporting full 32K-word addressing; driven by microcontroller address lines A0–A14 |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus compatible with 8-bit microcontrollers and peripheral interfaces |
| CE | Chip Enable | Active-low chip select; controls device activation and enables bus contention management in multi-device systems |
| OE | Output Enable | Active-low output gate; decouples data bus during read cycles without affecting internal state |
| VCC | Power Supply | Primary supply input supporting dual-range operation (2.7–3.6V or 4.5–5.5V) |
| GND | Ground Reference | Signal and power return path; requires local 0.1 µF ceramic decoupling per device |
| VPP | Programming Voltage | 13.0V ± 0.25V input during programming; must be applied simultaneously with or after VCC |
| NC | No Connect | Pins 1, 17 (PLCC) are unconnected; not present in TSOP variant - no NC pins in AT27BV256-70RU TSOP package |
Key Features
| Feature | Design Value |
|---|---|
| Unregulated Battery-Voltage™ Operation | Eliminates external voltage regulation in portable systems by accepting 2.7–3.6V directly from primary or secondary batteries |
| Rapid™ Programming Algorithm | Reduces production programming time via 100 µs/byte pulses and automatic verify-reprogram loops per byte |
| Integrated Product Identification Code | Enables automated programming equipment recognition via Manufacturer ID (0x1E) and Device ID (0x8C) bytes |
| JEDEC Pin Compatibility with AT27C256R | Allows drop-in replacement in existing 5V designs while retaining PCB layout and firmware compatibility |
| 2,000V ESD Protection | Ensures robust handling during board assembly and field deployment without additional protection circuitry |
Applications
| Portable Data Loggers | Industrial PLC Firmware Storage |
|---|---|
Use Scenario: Battery-powered environmental sensor nodes logging temperature, humidity, and pressure over extended periods without mains power. IC Role / Device Role / Timing Role: Nonvolatile program memory storing firmware and calibration tables; accessed randomly during wake-up cycles. Use Value: 20 µA max standby current extends battery life to >5 years; 70 ns access enables real-time response to interrupt-driven sensor events. |
Use Scenario: Programmable logic controllers requiring field-upgradable firmware stored in ruggedized enclosures operating in harsh factory environments. IC Role / Device Role / Timing Role: OTP boot ROM holding safety-critical startup code and I/O configuration; immune to accidental overwrite. Use Value: -40°C to +85°C rating ensures reliability across thermal cycling; 200 mA latchup immunity prevents failure under electrical transients on factory floors. |
| Medical Diagnostic Handhelds | Legacy System Retrofit Modules |
Use Scenario: Portable ultrasound or ECG analyzers requiring FDA-compliant firmware storage with traceable revision control and zero runtime corruption risk. IC Role / Device Role / Timing Role: Secure, one-time-programmable code repository; verified during manufacturing and never modified in field use. Use Value: Rapid™ programming supports high-yield production programming; integrated ID code enables automated lot traceability in regulated manufacturing. |
Use Scenario: Retrofit modules upgrading aging 5V industrial instrumentation to support modern low-power operation without redesigning PCBs. IC Role / Device Role / Timing Role: Pin-compatible replacement for AT27C256R, providing same functionality at lower voltage and power. Use Value: Dual-voltage support allows operation in both original 5V hosts and new 3V subsystems; eliminates need for voltage translators or board rework. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C256R-70PU | 5V-only operation (4.5–5.5V); no 3V support; 70 ns access; PLCC-32 package | Limited to fixed 5V systems; lacks battery-voltage flexibility and low-power standby | Select when legacy 5V design prohibits voltage scaling and board space allows larger PLCC package |
| AT27LV256A-70PU | 3V-only operation (2.7–3.6V); identical pinout and timing; PLCC-32 package | Cannot operate in 5V hosts; lacks dual-supply versatility of AT27BV256-70RU | Select when system exclusively uses 3V rails and PLCC mounting is preferred over TSOP |
Compared with AT27C256R-70PU and AT27LV256A-70PU, the AT27BV256-70RU uniquely bridges 3V and 5V domains while delivering lowest standby power and TSOP packaging for space-constrained designs - making it optimal for battery-powered upgrades and mixed-voltage retrofits.
Availability
AT27BV256-70RU is available at Aetrix Electronics and suitable for portable medical devices, industrial PLCs, battery-powered data loggers, and legacy system retrofit modules requiring stable component supply across long production lifecycles.
Supply support for AT27BV256-70RU 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 manufacturer specializing in microcontrollers, nonvolatile memory, and secure authentication ICs before its acquisition by Microchip Technology in 2016.
The AT27BV256-70RU belongs to Atmel's Battery-Voltage™ OTP EPROM family, designed specifically to replace 5V EPROMs in portable and mixed-supply embedded systems without sacrificing speed or reliability.
FAQ
What voltage ranges does the AT27BV256-70RU support during normal read operation?
The AT27BV256-70RU supports two distinct read-mode supply ranges: 2.7V to 3.6V for unregulated battery operation and 4.5V to 5.5V for standard 5V systems. Both ranges deliver guaranteed 70 ns access time. During programming, VCC must be set to 6.5V ± 0.25V and VPP to 13.0V ± 0.25V - these are separate from read-mode conditions and require dedicated programming hardware. The AT27BV256-70RU cannot operate in read mode at intermediate voltages like 4.0V.
Is the AT27BV256-70RU pin-compatible with the AT27C256R, and what does that mean for PCB design?
Yes, the AT27BV256-70RU is JEDEC-pin-compatible with the AT27C256R in SOIC and TSOP packages, sharing identical pin functions (A0–A14, O0–O7, CE, OE, VCC, GND, VPP). This means no PCB layout changes are required when replacing AT27C256R-70RC/TC with AT27BV256-70RU in existing designs. However, VPP routing must remain intact since both parts require 13V programming voltage, and the AT27BV256-70RU retains full backward compatibility with standard EPROM programmers.
What is the purpose of the Integrated Product Identification Code in the AT27BV256-70RU?
The AT27BV256-70RU embeds a two-byte electronic ID: Manufacturer ID = 0x1E and Device ID = 0x8C. This code is read by industry-standard programmers during setup to auto-select correct voltage profiles, timing parameters, and verification algorithms. It ensures reliable programming across production batches and eliminates manual configuration errors. The AT27BV256-70RU shares this exact ID with AT27C256R and AT27LV256A, confirming cross-programmer compatibility.
How does the Rapid™ Programming Algorithm improve manufacturing efficiency for the AT27BV256-70RU?
The Rapid™ Algorithm reduces average programming time to ~100 µs per byte by using short, precise 95–105 µs CE pulses followed by immediate verification. If verification fails, up to 10 additional pulses are applied per byte before declaring failure - avoiding full-device reprogramming. This yields higher throughput and lower energy consumption versus traditional EPROM algorithms. For a full 32K-byte image, the AT27BV256-70RU completes programming in under 3.5 seconds, significantly accelerating firmware loading in high-volume production.
Does the AT27BV256-70RU require external decoupling capacitors, and if so, what values?
Yes, the AT27BV256-70RU requires two decoupling capacitors: a 0.1 µF high-frequency ceramic capacitor placed directly between VCC and GND, as close to the device pins as possible, to suppress transients during CE transitions; and optionally, a 4.7 µF bulk electrolytic capacitor near the power entry point for arrays of multiple devices. These are mandatory per Atmel's system considerations - omitting them risks non-conformance due to voltage excursions exceeding absolute maximum ratings. The AT27BV256-70RU specification explicitly mandates the 0.1 µF capacitor for all operating modes.
AT27BV256-70RU 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:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOIC
AT27BV256-70RU FAQ
1.How can I place an order for AT27BV256-70RU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27BV256-70RU 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 AT27BV256-70RU reliable?
The price and inventory of AT27BV256-70RU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27BV256-70RU is usually 5 days.
3.What payment methods are accepted for AT27BV256-70RU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27BV256-70RU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27BV256-70RU?
AT27BV256-70RU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27BV256-70RU 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 AT27BV256-70RU?
For technical support, including AT27BV256-70RU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27BV256-70RU requirements.
6.How does Aetrix verify that AT27BV256-70RU is sourced from the original manufacturer or authorized distributors?
All AT27BV256-70RU 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 AT27BV256-70RU meets industry standards.
7.What is the process for return or replacement of AT27BV256-70RU?
All AT27BV256-70RU units undergo pre-shipment inspection (PSI). If there is an issue with AT27BV256-70RU, 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 AT27BV256-70RU part is unused and in its original packaging.
Return procedure for AT27BV256-70RU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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