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Microchip Technology AT27BV256-15TC
- Part No.:
- AT27BV256-15TC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
AT27BV256-15TC.pdf
- Description:
- IC EPROM 256KBIT PARALLEL 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,390
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Product details
Overview
AT27BV256-15TC 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 JEDEC-standard 28-pin TSOP packaging. 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 memory upgrade paths.
For engineers reviewing the AT27BV256-15TC datasheet, AT27BV256-15TC pinout, AT27BV256-15TC application, or AT27BV256-15TC equivalent, key selection criteria include unregulated battery voltage support, rapid 100 µs/byte programming, <1 µA typical standby current at 3V, JEDEC pin compatibility with AT27C256R, and industrial temperature range (-40°C to +85°C) operation.
Technical Context
The AT27BV256-15TC implements a CMOS OTP EPROM architecture with two-line control (CE/OE), supporting fast random-access reads and Rapid™ programming via VPP = 13.0V. Its dual-voltage design eliminates external regulation by accepting unregulated 2.7–3.6V battery input while maintaining TTL-level output drive at 3.0V.
It features integrated product identification (Manufacturer ID = 0x1E, Device ID = 0x8C), 2,000V ESD protection, and 200 mA latchup immunity. Programming requires simultaneous VCC/VPP sequencing per JEDEC specification, with verification performed byte-by-byte using CE pulse width control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32K × 8) - provides sufficient code storage for 8-bit microcontroller boot firmware or configuration tables. |
| Read Access Time | 150 ns max (tACC) - meets timing requirements for 6–7 MHz Z80/8051-based systems without wait states. |
| Supply Voltage Range | 2.7V–3.6V or 4.5V–5.5V - enables direct use with lithium coin cells or alkaline batteries without LDO regulation. |
| Standby Current | 20 µA max (ISB1) at VCC = 3.6V - extends battery life in always-on portable instrumentation. |
| Programming Speed | 100 µs/byte typical (Rapid™ Algorithm) - reduces production programming cycle time by >90% vs. legacy EPROMs. |
| Operating Temperature | -40°C to +85°C - qualified for industrial control panels and automotive under-hood modules. |
| Package Type | 28-lead TSOP (28T) - surface-mount compatible with high-density PCB layouts and automated assembly. |
Pinout & Package
AT27BV256-15TC is housed in a 28-lead plastic thin small outline package (TSOP), JEDEC standard 28T, with 0.55 mm pitch and 11.7 mm × 8.1 mm footprint. Pin 1 is marked by a notch on the top side.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus accepts full 32K-word range; compatible with 8085/Z80 address latching schemes. |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus with TTL/LVBO-compliant VOH/VOL levels across both supply ranges. |
| CE | Chip Enable | Active-low chip select; controls device power state-VIH = 0.7×VCC ensures reliable deactivation during sleep modes. |
| OE | Output Enable | Active-low output gate; decouples memory data from bus during DMA or interrupt service without contention. |
| VPP | Programming Voltage | 13.0V ±0.25V input required only during programming; must be applied simultaneously with VCC to prevent latchup. |
| VCC | Power Supply | Primary logic supply; powers core and I/O; supports unregulated battery input (2.7–3.6V) or standard 5V ±10%. |
| GND | Ground Reference | Common return path for VCC and VPP; requires local 0.1 µF ceramic bypass capacitor per device. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-Voltage Read Operation | Operates natively at 2.7–3.6V or 4.5–5.5V-eliminates need for external voltage translators or regulators in mixed-supply systems. |
| JEDEC Pin Compatibility | Pin-for-pin identical to AT27C256R-enables drop-in replacement in existing 28-pin SOIC/TSOP footprints without PCB redesign. |
| Rapid™ Programming | 100 µs/byte typical programming time-reduces factory programming throughput time and improves yield in high-volume manufacturing. |
| Integrated Product ID | Manufacturer ID (0x1E) and Device ID (0x8C) accessible via A9/VH and A0 toggle-enables automatic algorithm selection in universal programmers. |
| Low-Power Standby | <1 µA typical ISB at 3V-extends operational lifetime in battery-backed real-time clocks and sensor loggers. |
Applications
| Industrial PLC Firmware Storage | Portable Medical Device Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic firmware in DIN-rail mounted programmable logic controllers operating in factory environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Nonvolatile program memory providing deterministic 150 ns read access to instruction fetch cycles of 8-bit microcontrollers. Use Value: Industrial temperature rating (-40°C to +85°C) and 200 mA latchup immunity ensure reliability in electrically noisy plant-floor settings. |
Use Scenario: Holding calibrated sensor initialization routines and safety-critical startup sequences in handheld glucose meters and pulse oximeters powered by CR2032 coin cells. IC Role / Device Role / Timing Role: Low-voltage OTP EPROM delivering TTL-compatible outputs at 3.0V while drawing <1 µA in standby between measurements. Use Value: Unregulated 2.7–3.6V operation eliminates DC-DC converter, reducing BOM cost and board space in Class II medical devices. |
| Legacy System Memory Upgrade | Automotive Body Control Module Code Storage |
Use Scenario: Replacing obsolete 27C256 EPROMs in vintage test equipment and arcade game boards where 5V supply remains but battery backup is added. IC Role / Device Role / Timing Role: Pin-compatible memory drop-in with identical 28-pin TSOP footprint and JEDEC timing parameters (tACC = 150 ns). Use Value: Dual-voltage support allows same part to serve both original 5V designs and upgraded battery-backed versions without layout change. |
Use Scenario: Storing immutable door-lock actuation logic and lighting control algorithms in automotive body control modules exposed to under-dash thermal cycling. IC Role / Device Role / Timing Role: One-time programmable ROM ensuring firmware integrity against accidental overwrite or EMI-induced corruption. Use Value: 2,000V HBM ESD rating and guaranteed operation down to -40°C meet OEM AEC-Q100 stress test requirements for non-safety-critical ECUs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C256R-15PC | 5V-only operation (4.5–5.5V); no low-voltage mode; PLCC-32 package; 150 ns tACC. | Requires regulated 5V supply; incompatible with battery-only systems; larger footprint than TSOP. | Select when legacy 5V-only design prohibits voltage scaling and PLCC rework is acceptable. |
| AT27LV256A-15TC | 3V-only operation (2.7–3.6V); same TSOP-28 package; identical pinout; 150 ns tACC; no 5V support. | Cannot operate in dual-supply hosts; lacks 5V compatibility needed for hot-plug card applications. | Select when system uses only 3V rails and maximum power savings (<1 µA ISB) are prioritized over 5V interoperability. |
Compared with AT27C256R-15PC, AT27BV256-15TC adds battery-voltage flexibility and smaller TSOP packaging; compared with AT27LV256A-15TC, it retains critical 5V host compatibility-making AT27BV256-15TC the sole option for field-upgradable modules requiring plug-and-play operation across 3V and 5V platforms.
Availability
AT27BV256-15TC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, portable medical device boot ROM, and legacy system memory upgrades requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for AT27BV256-15TC 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 systems.
The AT27BV256 product line was designed specifically for battery-powered and dual-voltage embedded applications requiring reliable, low-power OTP memory with JEDEC-standard compatibility and rapid programming capability.
FAQ
What voltage ranges does the AT27BV256-15TC support during normal read operation?
The AT27BV256-15TC 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 at intermediate voltages like 4.0V. Both ranges deliver full functionality including 150 ns access time and TTL-compatible outputs at 3.0V, making AT27BV256-15TC uniquely suited for dual-supply environments such as hot-pluggable PC cards.
Is the AT27BV256-15TC pin-compatible with the AT27C256R series?
Yes, the AT27BV256-15TC is explicitly pin-compatible with JEDEC-standard AT27C256R devices in all supported packages-including the 28-lead TSOP variant. Signal names, pin positions, and timing behavior (tACC, tCE, tOE) match exactly, enabling direct substitution in existing 28-pin footprints without PCB modification. This compatibility is confirmed in the official Atmel datasheet Rev. 0601B, Section "Features".
What programming voltage and sequence are required for the AT27BV256-15TC?
The AT27BV256-15TC requires VPP = 13.0V ±0.25V and VCC = 6.5V ±0.25V during programming, with VCC applied simultaneously with or before VPP and removed simultaneously with or after VPP. Programming uses the Rapid™ algorithm with 100 µs CE pulses. The AT27BV256-15TC must not be programmed at 3.3V or 5V-doing so will fail to alter memory cells and may damage the device.
Does the AT27BV256-15TC support industrial temperature operation?
Yes, the AT27BV256-15TC is qualified for industrial temperature operation from -40°C to +85°C, as indicated by the "I" suffix in ordering codes like AT27BV256-15TI. The "TC" suffix denotes TSOP packaging and commercial temperature range (0°C to +70°C); therefore, AT27BV256-15TC itself is rated for 0°C to +70°C only. For industrial range, the correct part is AT27BV256-15TI in TSOP.
How does the AT27BV256-15TC achieve TTL-level outputs while operating at 3.0V?
The AT27BV256-15TC achieves TTL-compatible VOH (≥2.4V) and VOL (≤0.4V) at VCC = 3.0V through proprietary CMOS output buffer design that meets JEDEC LVTTL specifications. This allows direct interfacing with legacy 5V TTL logic without level shifters. At VCC = 2.7V, it complies with JEDEC LVBO standards instead-ensuring robust signal integrity across its entire 2.7–3.6V operating window.
AT27BV256-15TC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 28-TSSOP (0.465", 11.80mm Width)
- Packaging:
- Tray
- 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:
- 150 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:
- 28-TSOP
AT27BV256-15TC FAQ
1.How can I place an order for AT27BV256-15TC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27BV256-15TC 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 AT27BV256-15TC reliable?
The price and inventory of AT27BV256-15TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27BV256-15TC is usually 5 days.
3.What payment methods are accepted for AT27BV256-15TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27BV256-15TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27BV256-15TC?
AT27BV256-15TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27BV256-15TC 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 AT27BV256-15TC?
For technical support, including AT27BV256-15TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27BV256-15TC requirements.
6.How does Aetrix verify that AT27BV256-15TC is sourced from the original manufacturer or authorized distributors?
All AT27BV256-15TC 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 AT27BV256-15TC meets industry standards.
7.What is the process for return or replacement of AT27BV256-15TC?
All AT27BV256-15TC units undergo pre-shipment inspection (PSI). If there is an issue with AT27BV256-15TC, 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 AT27BV256-15TC part is unused and in its original packaging.
Return procedure for AT27BV256-15TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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