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Microchip Technology AT27BV256-90JC
- Part No.:
- AT27BV256-90JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT27BV256-90JC.pdf
- Description:
- IC EPROM 256KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,484
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Product details
Overview
AT27BV256-90JC from Atmel is a 256K-bit (32K × 8) one-time programmable EPROM optimized for low-voltage battery-powered systems, featuring 90 ns read access time at 2.7–3.6 V or 4.5–5.5 V, 20 µA max standby current, JEDEC-standard PLCC-32 package, and dual-voltage interface compatibility with TTL and LVBO logic families. It serves as nonvolatile program storage in portable instrumentation and embedded controllers requiring unregulated battery operation.
For engineers reviewing the AT27BV256-90JC datasheet, AT27BV256-90JC pinout, AT27BV256-90JC application, or AT27BV256-90JC equivalent, key selection criteria include its 90 ns access timing under 3.3 V, rapid 100 µs/byte programming algorithm, integrated product identification code, 2,000 V ESD rating, and pin compatibility with AT27C256R in PLCC-32 footprint.
Technical Context
The AT27BV256-90JC implements a CMOS OTP EPROM architecture with two-line control (CE/OE), enabling bus contention avoidance in shared-memory systems. Its dual-voltage design supports both unregulated 2.7–3.6 V battery supply and standard 5 V ±10% operation without external level shifters.
It uses Atmel's Rapid™ Programming Algorithm with 100 µs/byte typical write pulses at VCC = 6.5 V and VPP = 13.0 V, and includes an integrated product identification code accessible via A9/VH and A0 toggling - identical to AT27C256R and AT27LV256A for programming equipment compatibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 262,144 bits (32K × 8), fixed OTP configuration - no rewrites, ideal for firmware boot code storage. |
| Read Access Time | 90 ns max at VCC = 2.7–3.6 V or 4.5–5.5 V - meets timing for 11 MHz system clocks with margin. |
| Supply Voltage Range | 2.7–3.6 V (unregulated battery) or 4.5–5.5 V (standard 5 V rail) - eliminates need for voltage regulators in portable designs. |
| Standby Current | 20 µA max at VCC = 3.6 V (CMOS CE mode) - extends battery life in sleep-mode embedded systems. |
| Programming Speed | 100 µs/byte typical using Rapid™ algorithm - reduces production programming time vs. legacy EPROMs. |
| ESD Protection | 2,000 V HBM - ensures robustness during handling and board assembly without extra protection circuitry. |
| Operating Temperature | -40°C to +85°C (industrial grade) - validated for automotive body electronics and industrial control environments. |
Pinout & Package
AT27BV256-90JC 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; TTL/LVCMOS compatible thresholds. |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus; outputs drive TTL loads at 3.0 V and meet LVBO specs at 2.7 V. |
| CE | Chip Enable | Active-low chip select; controls device activation and entry to standby mode when high. |
| OE | Output Enable | Active-low output gate; enables data bus drivers independently of CE for bus sharing. |
| VCC | Power Supply | Primary supply input (2.7–3.6 V or 4.5–5.5 V); requires 0.1 µF ceramic decoupling capacitor. |
| VPP | Programming Voltage | 13.0 V ±0.25 V input during programming; must be applied simultaneously with or after VCC. |
| GND | Ground Reference | Signal and power return; decoupling capacitors must connect directly to this pin. |
| NC | No Connect | Pins 1 and 17 - physically present but electrically unused; must not be soldered or routed. |
Key Features
| Feature | Design Value |
|---|---|
| Unregulated Battery-Voltage™ Operation | Operates across full 2.7–3.6 V range without regulation - simplifies power architecture in handheld devices. |
| JEDEC Pin Compatibility with AT27C256R | Direct drop-in replacement in PLCC-32 footprint - enables legacy 5 V system upgrades without PCB redesign. |
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time with auto-verify loop - improves manufacturing throughput and yield. |
| Integrated Product Identification Code | Manufacturer ID (0x1E) and Device Code (0x8C) readable via A9/A0 - ensures correct algorithm selection by programmers. |
| Two-Line Control Architecture | Independent CE and OE inputs - allows flexible memory mapping and prevents bus contention in multi-device systems. |
Applications
| Portable Medical Instrumentation | Industrial PLC Firmware Storage |
|---|---|
|
Use Scenario: Battery-powered handheld glucose meters and portable ECG monitors requiring reliable firmware storage with minimal quiescent power draw. IC Role / Device Role / Timing Role: Nonvolatile program memory holding boot loader and calibration tables; accessed during cold start and periodic self-test. Use Value: 20 µA max standby current at 3.3 V extends single-cell lithium battery life beyond 5 years in sleep mode. |
Use Scenario: Fixed-function programmable logic controllers deployed in factory automation cabinets with wide ambient temperature swings. IC Role / Device Role / Timing Role: Read-only firmware repository for ladder logic execution engine; accessed sequentially during scan cycle initialization. Use Value: -40°C to +85°C industrial temperature rating ensures deterministic 90 ns read timing across operating environment. |
| Automotive Body Control Module | Legacy Industrial Equipment Retrofit |
|
Use Scenario: Door module ECUs in 12 V vehicle architectures where unregulated 3.3 V rails are derived from switched DC-DC converters. IC Role / Device Role / Timing Role: OTP storage for window/mirror control algorithms and EEPROM emulation lookup tables. Use Value: Dual-voltage support (2.7–3.6 V and 4.5–5.5 V) accommodates brown-out conditions and legacy 5 V test fixtures. |
Use Scenario: Upgrading aging industrial HMIs originally designed for AT27C256R EPROMs without modifying PCB layout. IC Role / Device Role / Timing Role: Pin-compatible firmware replacement enabling lower power and battery operation while retaining existing socket. Use Value: JEDEC-standard PLCC-32 footprint and identical pinout allow zero-change hardware migration from 5 V to 3.3 V systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C256R-90PC | 5 V only (4.5–5.5 V), no low-voltage operation; 90 ns access at 5 V; PLCC-28 package (not pin-compatible). | Requires regulated 5 V supply; unsuitable for battery-powered systems; lacks unregulated battery support. | Select only for legacy 5 V-only designs where VCC stability is guaranteed and power efficiency is secondary. |
| AT27LV256A-90JC | 3 V only (2.7–3.6 V), same PLCC-32 package and pinout; identical 90 ns timing; shares Rapid™ programming and ID code. | Not rated for 5 V operation; cannot be used in dual-supply or mixed-voltage host systems. | Prefer when system operates exclusively at 3.3 V and maximum compatibility with AT27BV256-90JC programming flow is required. |
Compared with AT27C256R-90PC, AT27BV256-90JC adds unregulated battery support and lower standby power but retains identical programming methodology; versus AT27LV256A-90JC, it trades 5 V compatibility for broader supply flexibility - making it the only option for systems that plug into both 3 V and 5 V hosts.
Availability
AT27BV256-90JC is available at Aetrix Electronics and suitable for portable medical instrumentation, industrial PLC firmware storage, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AT27BV256-90JC 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 product line was engineered to replace legacy 5 V EPROMs in battery-constrained systems, delivering TTL-compatible performance at 3 V while maintaining JEDEC pinout and programming compatibility.
FAQ
What is the maximum read access time specification for AT27BV256-90JC?
The AT27BV256-90JC has a guaranteed maximum read access time of 90 ns when operated at VCC = 2.7–3.6 V or 4.5–5.5 V, measured from address valid or CE/OE assertion to valid data output. This timing is fully characterized across the industrial temperature range (-40°C to +85°C) and applies to all supported supply voltages - no derating is required for 3.3 V operation. The "-90" suffix explicitly denotes this 90 ns speed grade.
Does AT27BV256-90JC require a separate programming voltage supply?
Yes, AT27BV256-90JC requires VPP = 13.0 V ±0.25 V during programming, applied simultaneously with or after VCC = 6.5 V ±0.25 V. A 0.1 µF ceramic capacitor must be placed between VPP and GND to suppress transients. During normal read operation, VPP may be tied to VCC. The AT27BV256-90JC does not support in-system programming without this dedicated high-voltage supply.
Is AT27BV256-90JC pin-compatible with AT27C256R in the same PLCC package?
No - AT27BV256-90JC uses a 32-lead PLCC (32J) package, while AT27C256R is typically offered in 28-lead PLCC (28J). However, AT27BV256-90JC is pin-compatible with AT27C256R *in function and signal assignment* when both are mounted in JEDEC-standard 32-lead PLCC sockets, and its pinout matches AT27C256R's 32-pin variant. Pins 1 and 17 are NC on AT27BV256-90JC and must remain unconnected.
What is the purpose of the Integrated Product Identification Code in AT27BV256-90JC?
AT27BV256-90JC includes a two-byte electronic ID (Manufacturer ID = 0x1E, Device Code = 0x8C) readable via A9 = 12.0 V and A0 toggling. This code allows industry-standard programmers to automatically detect the device type and apply correct programming algorithms and voltage profiles - ensuring reliable programming without manual setup. It is identical to AT27C256R and AT27LV256A for cross-programmer compatibility.
Can AT27BV256-90JC operate reliably at 2.7 V supply voltage?
Yes, AT27BV256-90JC is fully specified down to 2.7 V for read operations, with 90 ns access time maintained and all DC parameters (e.g., VIH, VOL, ICC) guaranteed across the 2.7–3.6 V range. At 2.7 V, output levels comply with JEDEC LVBO specifications, enabling direct interfacing with 2.5 V or 3.3 V logic families without level translation - a key enabler for unregulated battery systems.
AT27BV256-90JC 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:
- 90 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)
AT27BV256-90JC FAQ
1.How can I place an order for AT27BV256-90JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27BV256-90JC 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 AT27BV256-90JC reliable?
The price and inventory of AT27BV256-90JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27BV256-90JC is usually 5 days.
3.What payment methods are accepted for AT27BV256-90JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27BV256-90JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27BV256-90JC?
AT27BV256-90JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27BV256-90JC 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 AT27BV256-90JC?
For technical support, including AT27BV256-90JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27BV256-90JC requirements.
6.How does Aetrix verify that AT27BV256-90JC is sourced from the original manufacturer or authorized distributors?
All AT27BV256-90JC 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 AT27BV256-90JC meets industry standards.
7.What is the process for return or replacement of AT27BV256-90JC?
All AT27BV256-90JC units undergo pre-shipment inspection (PSI). If there is an issue with AT27BV256-90JC, 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 AT27BV256-90JC part is unused and in its original packaging.
Return procedure for AT27BV256-90JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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