My Inquiry
My Account
Microchip Technology AT27BV256-70JI
- Part No.:
- AT27BV256-70JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT27BV256-70JI.pdf
- Description:
- IC EPROM 256KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,403
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT27BV256-70JI 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 industrial temperature range (–40°C to +85°C). It serves as nonvolatile program storage in portable instrumentation and embedded controllers requiring unregulated battery compatibility.
For engineers reviewing the AT27BV256-70JI datasheet, AT27BV256-70JI pinout, AT27BV256-70JI application, or AT27BV256-70JI equivalent, this page delivers verified package mapping (32-lead PLCC), JEDEC-compliant timing parameters, standby current ≤20 µA at 3.6V, Rapid™ programming (100 µs/byte), and TTL/LVBO interface compatibility across voltage modes.
Technical Context
The AT27BV256-70JI implements a CMOS OTP EPROM architecture with two-line control (CE/OE), enabling bus contention prevention in shared-memory systems. Its dual-voltage design supports both unregulated 2.7–3.6V battery rails and standard 5V ±10% supplies without external regulation.
It features integrated product identification code (Manufacturer ID = 0x1E, Device ID = 0x8C), 2,000V ESD protection, and latchup immunity of 200 mA. Programming requires VCC = 6.5V and VPP = 13.0V, with verification performed per-byte using the Rapid™ algorithm.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32K × 8) - fixed OTP storage capacity for firmware or configuration data |
| Read Access Time | 70 ns max - enables direct execution from memory in high-speed microcontroller boot loaders |
| Supply Voltage Range | 2.7–3.6V or 4.5–5.5V - eliminates need for voltage regulators in mixed-supply or battery-only designs |
| Standby Current | 20 µA max at VCC = 3.6V - extends battery life in always-on portable devices |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded control and automotive under-hood modules |
| Programming Speed | 100 µs/byte typical - reduces production programming cycle time vs. legacy 5V EPROMs |
| Output Compatibility | TTL- and LVBO-compliant - interoperates with both 5V logic families and 3V low-voltage interfaces |
Pinout & Package
AT27BV256-70JI is supplied in a 32-lead Plastic Leaded Chip Carrier (PLCC) package per JEDEC MS-016 AE. Pin 1 and Pin 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; CMOS/TTL compatible thresholds |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus; outputs float when OE or CE inactive; VOL ≤ 0.4V at 2.0 mA |
| CE | Chip Enable | Active-low chip select; controls device activation and power state transition into standby |
| OE | Output Enable | Active-low output gate; allows output disable without entering standby, reducing bus contention risk |
| VCC | Power Supply | Primary supply input; accepts 2.7–3.6V or 4.5–5.5V; requires 0.1 µF ceramic decoupling capacitor |
| VPP | Programming Voltage | 13.0V programming supply; must be applied simultaneously with or after VCC; requires 0.1 µF capacitor to ground |
| GND | Ground Reference | Signal and power return path; decoupling capacitors must connect directly to this pin |
| NC | No Connect | Pins 1 and 17 - physically present but electrically isolated; must not be soldered or routed |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time with automatic verify-reprogram loop - cuts production burn-in time by >5× vs. conventional EPROMs |
| Dual-Voltage Read Operation | Operates natively at 2.7–3.6V or 4.5–5.5V - removes external LDO requirement in battery-backed systems |
| Integrated Product ID Code | Manufacturer ID 0x1E and Device ID 0x8C - enables auto-detection and algorithm selection in universal programmers |
| JEDEC Pin Compatibility | Pin-for-pin compatible with AT27C256R - allows drop-in replacement in existing 5V designs with no layout change |
| High-Reliability Process | 2,000V HBM ESD rating and 200 mA latchup immunity - ensures robustness in industrial handling and field deployment |
Applications
| Portable Medical Instrumentation | Industrial PLC Firmware Storage |
|---|---|
Use Scenario: Handheld blood glucose meters and portable ECG monitors powered by single-cell Li-ion or alkaline batteries. IC Role / Device Role / Timing Role: Nonvolatile firmware storage holding calibration tables, user interface code, and safety-critical boot routines. Use Value: Unregulated 2.7–3.6V operation eliminates DC/DC converter, reducing BOM cost and board area while maintaining 70 ns read speed for responsive UI rendering. |
Use Scenario: Modular programmable logic controllers deployed in factory automation environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Immutable firmware image storage for real-time I/O control logic, immune to accidental overwrite during runtime. Use Value: Industrial temperature rating (–40°C to +85°C) and 200 mA latchup immunity ensure reliable operation in electrically noisy plant-floor settings. |
| Legacy System Upgrade Path | Embedded Communication Module |
Use Scenario: Retrofitting aging 5V industrial controllers with low-power capability while retaining existing PCB layout. IC Role / Device Role / Timing Role: Direct replacement for AT27C256R in socketed EPROM slots, preserving system timing and signal integrity. Use Value: JEDEC pin compatibility and identical programming methodology enable zero-change hardware upgrade - no re-spin or requalification needed. |
Use Scenario: Cellular modem modules in remote telemetry units operating on solar-charged batteries. IC Role / Device Role / Timing Role: Storage of protocol stacks and carrier-specific configuration data requiring long-term retention without refresh. Use Value: 20 µA max standby current at 3.6V extends operational uptime between charges; TTL-compatible outputs interface directly with baseband processors. |
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, 32-pin PDIP package | Requires regulated 5V rail; unsuitable for battery-only systems; lacks unregulated battery support | Select when upgrading legacy 5V-only systems where board space permits DIP-to-PLCC adapter or socket replacement |
| AT27LV256A-70JC | 3V-only operation (2.7–3.6V); identical pinout and timing; lacks 5V compatibility and VPP programming voltage tolerance | Cannot operate in dual-supply host systems; incompatible with 5V logic without level translation | Choose only for new 3V-only designs where strict voltage isolation is enforced and 5V interoperability is unnecessary |
Compared with AT27C256R-70PC and AT27LV256A-70JC, the AT27BV256-70JI uniquely supports both 3V battery and 5V host operation in a single device, eliminating voltage translation circuitry and enabling plug-and-play compatibility across mixed-supply platforms.
Availability
AT27BV256-70JI is available at Aetrix Electronics and suitable for portable medical instrumentation, industrial PLC firmware storage, legacy system upgrades, and embedded communication modules requiring stable component supply across extended lifecycle programs.
Supply support for AT27BV256-70JI 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 industrial, automotive, and consumer applications.
The AT27BV256 product line was designed to bridge legacy 5V EPROM infrastructure with emerging low-power portable systems, delivering pin-compatible OTP memory with native battery-voltage operation and rapid programming.
FAQ
What is the maximum allowable VPP voltage for programming the AT27BV256-70JI?
The AT27BV256-70JI requires VPP = 13.0 ± 0.25V during programming, with absolute maximum rating of +14.0V on A9 and VPP pins. Exceeding 13.25V risks permanent damage; programming equipment must regulate VPP tightly within specification. The AT27BV256-70JI does not support VPP = 12.5V or lower for guaranteed byte programming.
Does the AT27BV256-70JI support true 3.3V TTL-level outputs without level shifters?
Yes - at VCC = 3.0V, the AT27BV256-70JI produces VOH ≥ 2.4V and VOL ≤ 0.4V under 2.0 mA load, meeting standard TTL output thresholds. This allows direct interfacing with 3.3V microcontrollers and FPGAs without level translation, confirmed by DC characteristics table on page 4 of the datasheet.
Can the AT27BV256-70JI be used in place of AT27C256R-70PC without PCB modifications?
Yes - the AT27BV256-70JI is JEDEC pin-compatible with AT27C256R and shares identical PLCC-32 footprint, pin functions, and programming algorithm. No PCB changes are required; however, VPP must be supplied at 13.0V instead of 12.5V, and VCC must be set to 6.5V during programming.
What decoupling capacitance is mandatory for stable operation of the AT27BV256-70JI?
A 0.1 µF ceramic capacitor must be placed between VCC and GND, mounted as close as possible to the AT27BV256-70JI pins. For multi-device arrays, a 4.7 µF bulk electrolytic capacitor is also required near the power entry point. These values are specified in the "System Considerations" section (page 2) to suppress transient voltage excursions during CE transitions.
Is the AT27BV256-70JI qualified for industrial temperature operation?
Yes - the "I" suffix in AT27BV256-70JI denotes industrial temperature grade, rated for continuous operation from –40°C to +85°C. This is explicitly confirmed in the Ordering Information table (page 10), where AT27BV256-70JI is listed under Industrial (-40°C to +85°C) with package code 32J.
AT27BV256-70JI 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:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT27BV256-70JI FAQ
1.How can I place an order for AT27BV256-70JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27BV256-70JI 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 AT27BV256-70JI reliable?
The price and inventory of AT27BV256-70JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27BV256-70JI is usually 5 days.
3.What payment methods are accepted for AT27BV256-70JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27BV256-70JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27BV256-70JI?
AT27BV256-70JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27BV256-70JI 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 AT27BV256-70JI?
For technical support, including AT27BV256-70JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27BV256-70JI requirements.
6.How does Aetrix verify that AT27BV256-70JI is sourced from the original manufacturer or authorized distributors?
All AT27BV256-70JI 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 AT27BV256-70JI meets industry standards.
7.What is the process for return or replacement of AT27BV256-70JI?
All AT27BV256-70JI units undergo pre-shipment inspection (PSI). If there is an issue with AT27BV256-70JI, 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 AT27BV256-70JI part is unused and in its original packaging.
Return procedure for AT27BV256-70JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT27BV256-70JI Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
