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Microchip Technology AT27BV256-70JC
- Part No.:
- AT27BV256-70JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT27BV256-70JC.pdf
- Description:
- IC EPROM 256KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT27BV256-70JC 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 (2.7V–3.6V or 4.5V–5.5V), and 20 µA max standby current at VCC = 3.6V. It serves as nonvolatile program storage in battery-powered embedded controllers and legacy microprocessor systems requiring pin compatibility with AT27C256R.
For engineers reviewing the AT27BV256-70JC datasheet, AT27BV256-70JC pinout, AT27BV256-70JC application, or AT27BV256-70JC equivalent, key selection criteria include unregulated battery voltage support (2.7V–3.6V), JEDEC-standard PLCC-32 packaging, TTL/LVTTL-compatible I/O, Rapid™ programming (100 µs/byte), and industrial temperature range (-40°C to +85°C) availability.
Technical Context
The AT27BV256-70JC implements a CMOS OTP EPROM architecture with two-line control (CE/OE), enabling bus contention avoidance in shared-memory systems. Its dual-supply design supports both unregulated battery operation and standard 5V host environments without level-shifting circuitry.
It uses Atmel's Rapid™ programming algorithm with 100 µs CE pulse width and integrated product identification code (Manufacturer ID: 0x1E, Device ID: 0x8C). Programming requires VCC = 6.5V and VPP = 13.0V, while read mode operates at VCC only - eliminating need for separate VPP regulation during normal use.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32K × 8) - provides sufficient boot code or firmware storage for 8-bit microcontrollers without external memory expansion. |
| Read Access Time | 70 ns - enables direct interface with 10–14 MHz Z80, 8051, or 68000-based systems without wait states. |
| Supply Voltage Range | 2.7V–3.6V or 4.5V–5.5V - eliminates need for voltage regulators in battery-powered designs and ensures interoperability with 5V logic buses. |
| Standby Current | 20 µA max at VCC = 3.6V - extends battery life in always-on embedded devices such as metering or sensor nodes. |
| Programming Speed | 100 µs/byte typical - reduces production programming time versus legacy 5V EPROMs, improving throughput in manufacturing test. |
| ESD Protection | 2,000V HBM - enhances robustness during handling and board assembly in high-volume electronics manufacturing. |
| Operating Temperature | -40°C to +85°C - qualified for industrial-grade applications including automotive body control modules and factory automation I/O cards. |
Pinout & Package
AT27BV256-70JC is supplied in a 32-lead Plastic Leaded Chip Carrier (PLCC) package per JEDEC MS-016 AE. Pins 1 and 17 are designated "DON'T CONNECT" and must remain unconnected on PCB layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus supporting full 32K-word addressing; compatible with standard 8-bit microprocessor address lines A0–A14. |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus outputs; TTL-compatible at VCC = 3.0V, LVBO-compliant at VCC = 2.7V. |
| CE | Chip Enable | Active-low chip select; controls device activation and power state transition between active and standby modes. |
| OE | Output Enable | Active-low output gate; allows multiple devices on same data bus by enabling/disabling outputs independently of CE. |
| VCC | Power Supply | Primary supply input for read and standby modes; accepts 2.7V–3.6V or 4.5V–5.5V; requires 0.1 µF ceramic decoupling capacitor. |
| VPP | Programming Voltage | 13.0V programming supply input; must be applied simultaneously with or after VCC and removed simultaneously with or before VCC. |
| GND | Ground Reference | Common return path for VCC and VPP; requires low-inductance connection to minimize noise during rapid programming transitions. |
| NC | No Connect | Pins 1 and 17 are internally unused and must be left floating - no trace routing or solder mask opening required. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-Voltage Read Operation | Supports unregulated battery (2.7V–3.6V) and standard 5V (4.5V–5.5V) supplies in same device - simplifies BOM for multi-platform designs. |
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time with automatic verify/reprogram loop - reduces programming station dwell time and improves yield. |
| Integrated Product ID Code | Manufacturer ID (0x1E) and Device ID (0x8C) accessible via A9/VH and A0 toggle - enables auto-detection and algorithm selection in universal programmers. |
| JEDEC Pin Compatibility | Pinout matches AT27C256R - allows drop-in replacement in existing 5V designs without PCB revision when used with 5V supply. |
| Low-Power Standby Mode | 20 µA max ICC at VCC = 3.6V - enables long-term retention in sleep-mode applications like smart utility meters or remote sensors. |
Applications
| Portable Data Logger | Industrial PLC Firmware Storage |
|---|---|
|
Use Scenario: Battery-powered environmental monitoring unit logging temperature/humidity every 15 minutes over 5-year deployment. IC Role / Device Role / Timing Role: Nonvolatile program memory storing firmware and calibration tables; accessed only during wake-up intervals. Use Value: 20 µA max standby current extends coin-cell battery life beyond 5 years; 2.7V minimum VCC tolerates aging battery discharge curve. |
Use Scenario: Modular programmable logic controller with field-upgradable firmware stored in local EPROM. IC Role / Device Role / Timing Role: Boot ROM holding initialization code and real-time task scheduler; mapped into CPU address space at power-on reset. Use Value: 70 ns access time eliminates wait states for 8-MHz 8051 core; -40°C to +85°C rating ensures reliability in factory-floor enclosures. |
| Legacy Microcontroller Upgrade Path | Card-Based Embedded System |
|
Use Scenario: Retrofitting older 5V-only instrumentation with low-power capability while retaining existing PCB layout. IC Role / Device Role / Timing Role: Direct replacement for AT27C256R in socketed EPROM footprint; identical pinout and timing interface. Use Value: JEDEC pin compatibility enables hardware reuse; dual-voltage operation allows gradual migration to 3.3V system rails without redesign. |
Use Scenario: PCMCIA or CompactFlash adapter card hosting FPGA configuration bitstream and host-interface firmware. IC Role / Device Role / Timing Role: OTP storage for FPGA configuration image and USB-to-FPGA bridge firmware; accessed during card insertion and enumeration. Use Value: Rapid™ programming enables fast firmware updates during card manufacturing; TSOP/SOIC variants allow space-constrained card layouts. |
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 (4.5V–5.5V); no low-voltage mode; 70 ns access; PLCC-28 package (28-pin vs. 32-pin). | Requires 5V regulator; incompatible with battery-only systems; not pin-compatible due to different pin count and VPP placement. | Select when upgrading legacy 5V-only systems where PCB layout cannot accommodate 32-pin PLCC or dual-voltage requirements are absent. |
| AT27LV256A-70JC | 3V-only operation (2.7V–3.6V); same 70 ns speed and PLCC-32 package; lacks 5V compatibility and integrated ID code. | Cannot operate in 5V hosts; no product ID byte support limits programmer auto-detection capability. | Select when strict 3V-only operation is mandated and programming equipment does not require ID code verification. |
Compared with AT27C256R-70PC and AT27LV256A-70JC, the AT27BV256-70JC uniquely bridges 3V battery and 5V host environments while retaining JEDEC-standard pinout and adding programmable ID for automated manufacturing - making it optimal for mixed-supply embedded upgrades.
Availability
AT27BV256-70JC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, portable data loggers, legacy microcontroller upgrade paths, and card-based embedded systems requiring stable component supply across extended lifecycle windows.
Supply support for AT27BV256-70JC 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, nonvolatile memory, and secure authentication ICs for industrial, automotive, and consumer applications.
The AT27BV256-70JC belongs to Atmel's Battery-Voltage™ OTP EPROM product line, designed specifically to eliminate voltage regulation in portable and battery-operated systems while maintaining compatibility with legacy 5V architectures.
FAQ
What voltage ranges does the AT27BV256-70JC support during normal read operation?
The AT27BV256-70JC 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. It does not operate at intermediate voltages like 3.3V or 4.0V outside these bands. Both ranges deliver guaranteed 70 ns access time and full TTL/LVBO compatibility, enabling flexible system-level power architecture decisions without compromising performance. The AT27BV256-70JC requires no external level shifters when interfacing with either 3.3V or 5V logic families.
Is the AT27BV256-70JC pin-compatible with the AT27C256R?
Yes, the AT27BV256-70JC is explicitly designed to be pin-compatible with the JEDEC-standard AT27C256R in PLCC-32 packaging. Pin functions, signal timing, and control logic (CE/OE) match identically. However, the AT27BV256-70JC adds dual-voltage capability and integrated product ID code - features not present in the AT27C256R. When operated at 5V, the AT27BV256-70JC behaves functionally identical to the AT27C256R, allowing direct substitution in existing designs without PCB changes.
What programming voltage and conditions are required for the AT27BV256-70JC?
The AT27BV256-70JC requires VCC = 6.5V ± 0.25V and VPP = 13.0V ± 0.25V during programming, with VCC applied simultaneously with or before VPP and removed simultaneously with or after VPP. Programming uses a 100 µs CE pulse width and the Rapid™ algorithm, verified per byte with up to 10 retries on failure. A 0.1 µF capacitor must be placed between VPP and GND to suppress transients. The AT27BV256-70JC uses the same programming equipment as the AT27C256R, but voltage settings must be adjusted accordingly.
Does the AT27BV256-70JC support industrial temperature range operation?
Yes, the AT27BV256-70JC is qualified for industrial temperature operation from -40°C to +85°C, as confirmed by the "I" suffix in ordering codes like AT27BV256-70JI. This rating applies to both read and standby modes under specified voltage ranges. The device maintains full 70 ns access time and 20 µA max standby current across this range, meeting requirements for factory automation, outdoor metering, and transportation electronics where thermal stability is critical. The AT27BV256-70JC undergoes extended burn-in and parametric screening to ensure reliability at temperature extremes.
How is the Integrated Product Identification Code accessed on the AT27BV256-70JC?
The AT27BV256-70JC's Integrated Product Identification Code is accessed by setting A9 to VH (11.5–12.5V), holding all other address lines A1–A14 low, and toggling A0 between VIL (to read Manufacturer ID 0x1E) and VIH (to read Device ID 0x8C). Outputs O0–O7 reflect the corresponding 8-bit code. This feature enables automatic device recognition in universal programmers and eliminates manual part selection errors. The AT27BV256-70JC shares the same ID codes as AT27C256R and AT27LV256A, ensuring consistent toolchain support.
AT27BV256-70JC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- 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:
- 32-PLCC (13.97x11.43)
AT27BV256-70JC FAQ
1.How can I place an order for AT27BV256-70JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27BV256-70JC 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 AT27BV256-70JC reliable?
The price and inventory of AT27BV256-70JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27BV256-70JC is usually 5 days.
3.What payment methods are accepted for AT27BV256-70JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27BV256-70JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27BV256-70JC?
AT27BV256-70JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27BV256-70JC 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 AT27BV256-70JC?
For technical support, including AT27BV256-70JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27BV256-70JC requirements.
6.How does Aetrix verify that AT27BV256-70JC is sourced from the original manufacturer or authorized distributors?
All AT27BV256-70JC 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 AT27BV256-70JC meets industry standards.
7.What is the process for return or replacement of AT27BV256-70JC?
All AT27BV256-70JC units undergo pre-shipment inspection (PSI). If there is an issue with AT27BV256-70JC, 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 AT27BV256-70JC part is unused and in its original packaging.
Return procedure for AT27BV256-70JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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