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Microchip Technology AT27BV256-12JC
- Part No.:
- AT27BV256-12JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT27BV256-12JC.pdf
- Description:
- IC EPROM 256KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,897
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Product details
Overview
AT27BV256-12JC 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 20 µA max standby current at VCC = 3.6V. 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 5V host cards.
For engineers reviewing the AT27BV256-12JC datasheet, AT27BV256-12JC pinout, AT27BV256-12JC application, or AT27BV256-12JC equivalent, key selection criteria include unregulated battery voltage support, JEDEC-standard PLCC-32 packaging, Rapid™ programming (100 µs/byte), 2,000V ESD protection, and pin compatibility with AT27C256R in read mode.
Technical Context
The AT27BV256-12JC implements a CMOS OTP EPROM architecture with two-line control (CE/OE), eliminating bus contention in shared-memory systems. Its dual-voltage design enables seamless operation across regulated 5V and unregulated 2.7–3.6V battery rails without level-shifting circuitry.
It uses Atmel's Rapid™ Programming Algorithm requiring VCC = 6.5V and VPP = 13.0V during programming, with built-in product identification code (Manufacturer ID = 0x1E, Device ID = 0x8C) for automated programmer recognition. The device supports both CMOS- and TTL-compatible I/O thresholds depending on VCC level.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32K × 8) - provides sufficient boot code storage for microcontroller-based embedded systems without external memory expansion. |
| Read Access Time | 120 ns max at VCC = 2.7–3.6V - meets timing requirements for 8-bit microprocessor buses operating up to ~8 MHz. |
| Supply Voltage Range | 2.7V–3.6V or 4.5V–5.5V - eliminates need for voltage regulation in battery-powered designs and ensures interoperability with 5V logic families. |
| Standby Current | 20 µA max at VCC = 3.6V - extends battery life in always-on or intermittently active portable equipment. |
| Programming Speed | 100 µs/byte typical - reduces production programming time versus standard EPROMs, improving throughput in manufacturing test environments. |
| ESD Protection | 2,000V HBM - enhances robustness during handling and board assembly in non-ESD-controlled environments. |
| Operating Temperature | -40°C to +85°C - qualified for industrial-grade applications including automotive body electronics and industrial controllers. |
Pinout & Package
AT27BV256-12JC is supplied in a 32-lead Plastic Leaded Chip Carrier (PLCC) package per JEDEC MS-016AE. Pins 1 and 17 are designated "DON'T CONNECT" and must remain unconnected in PCB layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus supporting full 32K-word addressing; driven by microcontroller or FPGA address lines. |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus compatible with TTL and LVTTL logic levels depending on VCC. |
| CE | Chip Enable | Active-low chip select; controls device activation and entry into standby mode when high. |
| OE | Output Enable | Active-low output control; used to gate data onto shared bus without affecting CE state. |
| VCC | Power Supply | Primary supply input accepting 2.7–3.6V or 4.5–5.5V; requires local 0.1 µF ceramic decoupling capacitor. |
| GND | Ground Reference | System ground return path; must be connected to low-impedance ground plane for stable read timing. |
| VPP | Programming Voltage | 13.0V programming supply input; only active during programming; requires dedicated 0.1 µF capacitor to ground. |
| NC | No Connect | Pins not internally bonded; must be left floating or tied to ground per board-level noise mitigation strategy. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-Voltage Read Operation | Operates natively at 2.7–3.6V or 4.5–5.5V without external regulators-reduces BOM count and PCB area in mixed-supply systems. |
| JEDEC Pin Compatibility | Pinout matches AT27C256R in read mode, enabling drop-in replacement in existing 5V designs with no layout changes. |
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time with automatic verify-and-reprogram loop-improves yield and reduces programming station dwell time. |
| 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. |
| LVBO Interface Compliance | Fully compliant with JEDEC Low Voltage Battery Operation specs at 2.7V-ensures reliable interfacing with modern low-power microcontrollers. |
Applications
| Portable Medical Devices | Industrial PLC Modules |
|---|---|
Use Scenario: Battery-powered handheld diagnostic instruments requiring persistent firmware storage with minimal power draw between measurements. IC Role / Device Role / Timing Role: Nonvolatile boot ROM storing initialization code and calibration tables for ARM Cortex-M0+ MCU. Use Value: 20 µA standby current extends single-cell Li-ion battery life to >12 months in sleep mode; 70 ns access supports real-time sensor response. |
Use Scenario: DIN-rail mounted programmable logic controller modules deployed in factory automation environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Fixed-function configuration memory holding ladder logic execution parameters and I/O mapping tables. Use Value: -40°C to +85°C rating ensures reliability across industrial temperature ranges; 2,000V ESD protection withstands factory EMI exposure. |
| Legacy System Upgrades | Embedded Card Readers |
Use Scenario: Retrofitting aging 5V ISA-bus industrial PCs with low-power firmware storage while retaining mechanical and electrical compatibility. IC Role / Device Role / Timing Role: Direct replacement for AT27C256R in existing socketed EPROM slots, maintaining identical pinout and timing behavior. Use Value: JEDEC-compliant PLCC-32 footprint and pin-for-pin read-mode compatibility eliminate PCB redesign and requalification effort. |
Use Scenario: Contactless smart card readers powered by USB or coin-cell batteries requiring secure, tamper-resistant firmware storage. IC Role / Device Role / Timing Role: OTP memory storing cryptographic keys and protocol stack binaries, preventing unauthorized firmware modification. Use Value: One-time programmability prevents field reprogramming of security-critical code; LVBO compliance enables direct USB 3.3V rail connection. |
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; 70 ns access; PDIP-28 package. | Requires regulated 5V supply; incompatible with battery-powered systems below 4.5V. | Select when retrofitting legacy 5V-only systems where VCC stability is guaranteed and PLCC-32 footprint is not required. |
| AT27LV256A-12JC | 3V-only operation (2.7–3.6V); same PLCC-32 package; 120 ns access; lacks 5V compatibility. | Cannot operate in dual-supply hosts; no TTL-level output drive at 3.0V. | Select only for new 3V-only designs where 5V interoperability is unnecessary and cost-sensitive sourcing favors LV variant. |
Compared with AT27C256R-70PC and AT27LV256A-12JC, the AT27BV256-12JC uniquely bridges 3V battery and 5V host environments while retaining JEDEC PLCC-32 packaging-making it the sole option for plug-in compatibility across both voltage domains without hardware adaptation.
Availability
AT27BV256-12JC is available at Aetrix Electronics and suitable for portable medical devices, industrial PLC modules, and legacy system upgrades requiring stable component supply, long-term lifecycle assurance, and JEDEC-standard PLCC packaging.
Supply support for AT27BV256-12JC 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 and industrial applications.
The AT27BV256-12JC belongs to Atmel's Battery-Voltage™ OTP EPROM family, engineered specifically for systems that must operate directly from unregulated primary or rechargeable batteries while maintaining compatibility with legacy 5V infrastructure.
FAQ
What voltage range does the AT27BV256-12JC support during normal read operation?
The AT27BV256-12JC supports two distinct read voltage ranges: 2.7V to 3.6V for unregulated battery operation and 4.5V to 5.5V for standard 5V systems. It does not operate reliably between 3.6V and 4.5V. This dual-range capability allows the AT27BV256-12JC to serve as a single memory solution across both portable and legacy platforms without external regulators or level shifters.
Is the AT27BV256-12JC pin-compatible with the AT27C256R in all operating modes?
The AT27BV256-12JC is pin-compatible with the AT27C256R only in read mode-not during programming or verification. Both share identical PLCC-32 pinouts and signal assignments (A0–A14, O0–O7, CE, OE, VCC, GND, VPP), but AT27BV256-12JC requires VPP = 13.0V for programming, whereas AT27C256R uses 12.5V. The AT27BV256-12JC maintains full functional equivalence in read operations, making it a verified drop-in replacement for AT27C256R in existing designs.
What is the purpose of the VPP pin on the AT27BV256-12JC, and how must it be managed?
The VPP pin on the AT27BV256-12JC supplies 13.0V programming voltage during OTP write cycles and must be isolated from VCC during normal read operation. Per datasheet requirements, VPP must be applied simultaneously with or after VCC and removed simultaneously with or before VCC. A 0.1 µF ceramic capacitor is mandatory between VPP and GND to suppress transients. The AT27BV256-12JC cannot be programmed without correct VPP sequencing and voltage compliance.
Does the AT27BV256-12JC support automatic device identification during programming?
Yes-the AT27BV256-12JC features an Integrated Product Identification Code accessible via A9 (driven to VH = 12.0V) and A0 (toggled to select Manufacturer ID = 0x1E or Device ID = 0x8C). This allows industry-standard programmers to auto-detect the AT27BV256-12JC and load the correct programming algorithm and voltage profiles without manual configuration, reducing setup errors in high-volume production.
How does the AT27BV256-12JC achieve TTL-level output compatibility at 3.0V supply?
The AT27BV256-12JC achieves TTL-compatible VOH (≥2.4V) and VOL (≤0.4V) at VCC = 3.0V through optimized CMOS output driver design, meeting JEDEC LVTTL thresholds. This enables direct interfacing with 5V-tolerant microcontrollers and logic families without level translators. The AT27BV256-12JC maintains this compatibility across its full 2.7–3.6V operating range, unlike many 3V-only memories that degrade output swing near minimum VCC.
AT27BV256-12JC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- 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:
- 120 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)
AT27BV256-12JC FAQ
1.How can I place an order for AT27BV256-12JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27BV256-12JC 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 AT27BV256-12JC reliable?
The price and inventory of AT27BV256-12JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27BV256-12JC is usually 5 days.
3.What payment methods are accepted for AT27BV256-12JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27BV256-12JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27BV256-12JC?
AT27BV256-12JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27BV256-12JC 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 AT27BV256-12JC?
For technical support, including AT27BV256-12JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27BV256-12JC requirements.
6.How does Aetrix verify that AT27BV256-12JC is sourced from the original manufacturer or authorized distributors?
All AT27BV256-12JC 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 AT27BV256-12JC meets industry standards.
7.What is the process for return or replacement of AT27BV256-12JC?
All AT27BV256-12JC units undergo pre-shipment inspection (PSI). If there is an issue with AT27BV256-12JC, 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 AT27BV256-12JC part is unused and in its original packaging.
Return procedure for AT27BV256-12JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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