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Microchip Technology AT27BV256-70JU-T
- Part No.:
- AT27BV256-70JU-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT27BV256-70JU-T.pdf
- Description:
- IC EPROM 256KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,492
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Product details
Overview
AT27BV256-70JU-T from Microchip Technology (formerly Atmel) is a 256K-bit (32K × 8) one-time programmable EPROM optimized for low-voltage, battery-powered systems. It operates across dual supply ranges (2.7V–3.6V unregulated or 4.5V–5.5V standard), delivers 70ns read access time, supports industrial temperature range (−40°C to +85°C), and uses JEDEC-standard 32-lead PLCC packaging - enabling direct integration into portable instrumentation and legacy embedded controllers.
For engineers reviewing the AT27BV256-70JU-T datasheet, AT27BV256-70JU-T pinout, AT27BV256-70JU-T application, or AT27BV256-70JU-T equivalent, key selection criteria include its dual-voltage compatibility, sub-1µA typical standby current at 3V, rapid 100µs/byte programming, TTL/LVBO interface compliance, and pin-for-pin equivalence with AT27C256R in read mode.
Technical Context
The AT27BV256-70JU-T implements a CMOS-based OTP EPROM architecture with two-line control (CE/OE) enabling bus contention avoidance in shared-memory systems. Its dual-voltage design allows seamless operation across 3V battery rails and 5V host systems without level-shifting circuitry.
It features integrated product identification code (0x1E8C), 2,000V HBM ESD protection, and 200mA latchup immunity. Programming requires VCC = 6.5V and VPP = 13.0V, with a verified rapid algorithm using 100µs CE pulses and up to 10 retries per byte - distinct from standard UV-erasable EPROMs and flash devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 256K-bit (32K × 8) OTP EPROM - fixed content after programming; no erase capability. |
| Read access time | 70ns max at VCC = 2.7V–3.6V - enables real-time firmware fetch in 8-bit microcontroller boot loaders. |
| Supply voltage range | 2.7V–3.6V (unregulated battery) or 4.5V–5.5V (standard) - eliminates need for external regulators in portable designs. |
| Standby current | 20µA max (CMOS mode), <1µA typical at 3V - extends battery life in always-on monitoring modules. |
| Active power dissipation | 29mW max at 5MHz and VCC = 3.6V - ~20% of equivalent 5V EPROMs, reducing thermal load on PCB. |
| Operating temperature | −40°C to +85°C industrial range - qualified for deployment in factory automation and outdoor telemetry units. |
| Programming speed | 100µs/byte typical - reduces production test time vs. legacy EPROMs requiring longer pulse widths. |
Pinout & Package
Package: 32-lead plastic J-leaded chip carrier (PLCC), JEDEC MS-016 Variation AE compliant; body dimensions 12.47mm × 14.99mm × 3.35mm (max height); lead finish: matte tin.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address inputs | 15-bit address bus supporting full 32K-word addressing; TTL/LVBO compatible thresholds. |
| O0–O7 | Data outputs | 8-bit bidirectional data bus; outputs drive TTL loads at VCC = 3.0V and LVBO at VCC = 2.7V. |
| CE | Chip enable | Active-low global enable; controls device activation and entry to standby mode when high. |
| OE | Output enable | Active-low output gate; allows multiple devices on same data bus without contention. |
| VCC | Power supply | Primary supply input; must be applied simultaneously with or before VPP during programming. |
| VPP | Programming voltage | 13.0V ±0.25V required only during programming; tied to VCC in read/standby modes. |
| GND | Ground reference | Signal and power ground; requires 0.1µF ceramic capacitor placed adjacent to pin per datasheet. |
| NC | No connect | Pins 1 and 17 are internally unused; must remain unconnected per JEDEC PLCC specification. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage interface compatibility | Outputs meet TTL logic levels at VCC = 3.0V and LVBO specs at VCC = 2.7V - interoperable with both 3V and 5V system logic without translators. |
| Rapid programming algorithm | 100µs/byte typical with automatic verify-and-retry loop - cuts programming time by >50% vs. conventional EPROMs and ensures byte-level reliability. |
| Integrated product ID code | Fixed 16-bit identifier (0x1E8C) accessible via A9/VH and A0 toggle - enables automated programmer recognition and BOM traceability. |
| High-reliability process | 2,000V HBM ESD rating and 200mA latchup immunity - suitable for industrial environments with noisy power rails and electrostatic handling. |
| Green packaging | Pb/halide-free PLCC construction - complies with RoHS Directive 2011/65/EU and supports environmentally regulated deployments. |
Applications
| Industrial PLC Firmware Storage | Medical Device Boot ROM |
|---|---|
Use Scenario: Storing immutable firmware for programmable logic controllers operating in factory-floor environments with wide ambient temperature swings and unregulated 3.6V battery backup. IC Role / Device Role / Timing Role: Nonvolatile boot ROM providing deterministic instruction fetch timing (tACC ≤ 70ns) during cold start and brownout recovery. Use Value: Eliminates external voltage regulation and enables direct connection to 3.6V Li-ion backup rails while maintaining TTL-compatible outputs for legacy 5V microcontrollers. |
Use Scenario: Holding certified diagnostic firmware in portable ultrasound or infusion pump controllers where data integrity and long-term retention (>10 years) are mandated. IC Role / Device Role / Timing Role: One-time programmable memory storing FDA-cleared software images; programmed once during final test and sealed. Use Value: Sub-1µA standby current extends battery runtime between calibrations; industrial temp rating ensures reliability during sterilization cycles. |
| Legacy Test Equipment Memory | Avionics Configuration Module |
Use Scenario: Replacing obsolete 27C256 EPROMs in aging semiconductor ATE platforms requiring drop-in compatibility and extended lifecycle support. IC Role / Device Role / Timing Role: Pin-compatible read-only memory used for pattern generator lookup tables and calibration constants. Use Value: Direct replacement for AT27C256R with identical pinout and AC timing - no PCB redesign needed; supports existing programmers via identical rapid algorithm. |
Use Scenario: Storing aircraft-specific configuration data (e.g., sensor scaling factors, flight envelope limits) in line-replaceable units (LRUs) with strict DO-254 compliance requirements. IC Role / Device Role / Timing Role: Immutable configuration store accessed during power-up initialization; immune to radiation-induced bit flips due to OTP structure. Use Value: 200mA latchup immunity and −40°C to +85°C operation ensure robustness under vibration, thermal cycling, and EMI exposure in avionics bays. |
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 (4.5V–5.5V); no 2.7V–3.6V support; identical 70ns tACC and PLCC-32 package. | Requires regulated 5V rail; unsuitable for battery-backed or dual-voltage systems. | Select when legacy 5V-only infrastructure exists and low-voltage operation is unnecessary. |
| AT27LV256A-70PU | 3V-only operation (2.7V–3.6V); lacks 5V compatibility; same 70ns speed and PLCC-32 footprint. | Cannot interface directly with 5V TTL logic without level shifters; limited to pure 3V systems. | Select when system is fully 3V-native and maximum power savings (<1µA standby) are critical. |
Compared with AT27C256R-70PU and AT27LV256A-70PU, the AT27BV256-70JU-T uniquely bridges both voltage domains - enabling single-BOM support across 3V and 5V host platforms while retaining identical programming tooling and pinout.
Availability
AT27BV256-70JU-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device boot ROM, legacy test equipment memory, and avionics configuration modules requiring stable component supply across extended product lifecycles.
Supply support for AT27BV256-70JU-T 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
Microchip Technology acquired Atmel in 2016 and maintains full support for legacy Atmel memory products including the AT27BV256 series.
The AT27BV256 belongs to Atmel's low-voltage OTP EPROM product line, designed specifically for portable, battery-operated, and dual-supply embedded systems requiring reliable nonvolatile storage without erase capability.
FAQ
What is the programming voltage requirement for AT27BV256-70JU-T?
The AT27BV256-70JU-T requires VPP = 13.0V ± 0.25V and VCC = 6.5V ± 0.25V during programming. These voltages must be applied simultaneously, and VCC must be present before or concurrently with VPP. The AT27BV256-70JU-T does not support in-system programming at standard logic voltages - dedicated EPROM programmers meeting these specifications are required.
Is AT27BV256-70JU-T pin-compatible with AT27C256R?
Yes, the AT27BV256-70JU-T is pin-compatible with JEDEC-standard AT27C256R in read mode, sharing identical 32-lead PLCC pinout, address/data/control signal mapping, and DC/AC timing parameters. However, AT27BV256-70JU-T adds dual-voltage operation and requires different programming voltages - the AT27BV256-70JU-T remains functionally interchangeable for read-only applications.
What is the maximum standby current of AT27BV256-70JU-T at 3.0V?
The AT27BV256-70JU-T specifies a maximum standby current of 20µA under CMOS conditions (CE = VCC ± 0.3V) at VCC = 3.6V, with typical consumption less than 1µA at VCC = 3.0V. This ultra-low quiescent draw makes the AT27BV256-70JU-T suitable for battery-backed applications where multi-year shelf life is required without periodic refresh.
Does AT27BV256-70JU-T support TTL-level outputs at 3.0V supply?
Yes, the AT27BV256-70JU-T produces TTL-compatible output levels (VOH ≥ 2.4V, VOL ≤ 0.4V) when VCC = 3.0V, allowing direct interfacing with standard 5V TTL logic without level-shifting circuitry. This behavior is explicitly validated in the datasheet for VCC = 3.0V to 3.6V and distinguishes the AT27BV256-70JU-T from most other 3V-only memories.
What is the purpose of the integrated product identification code in AT27BV256-70JU-T?
The AT27BV256-70JU-T includes a fixed 16-bit product ID code (0x1E8C) accessible via A9 and A0 under specific voltage conditions (A9 = 12.0V, A0 toggled). This code enables automated programmer identification, prevents incorrect algorithm selection, and provides traceability for manufacturing and field returns - the AT27BV256-70JU-T shares this ID with AT27C256R and AT27LV256A to ensure cross-programmer compatibility.
AT27BV256-70JU-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 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 (11.43x13.97)
AT27BV256-70JU-T FAQ
1.How can I place an order for AT27BV256-70JU-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27BV256-70JU-T 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 AT27BV256-70JU-T reliable?
The price and inventory of AT27BV256-70JU-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27BV256-70JU-T is usually 5 days.
3.What payment methods are accepted for AT27BV256-70JU-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27BV256-70JU-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27BV256-70JU-T?
AT27BV256-70JU-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27BV256-70JU-T 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 AT27BV256-70JU-T?
For technical support, including AT27BV256-70JU-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27BV256-70JU-T requirements.
6.How does Aetrix verify that AT27BV256-70JU-T is sourced from the original manufacturer or authorized distributors?
All AT27BV256-70JU-T 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 AT27BV256-70JU-T meets industry standards.
7.What is the process for return or replacement of AT27BV256-70JU-T?
All AT27BV256-70JU-T units undergo pre-shipment inspection (PSI). If there is an issue with AT27BV256-70JU-T, 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 AT27BV256-70JU-T part is unused and in its original packaging.
Return procedure for AT27BV256-70JU-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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