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Microchip Technology AT27LV256A-55JC
- Part No.:
- AT27LV256A-55JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT27LV256A-55JC.pdf
- Description:
- IC EPROM 256KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,684
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Product details
Overview
AT27LV256A-55JC from Atmel is a 32K × 8-bit one-time programmable (OTP) EPROM with 55 ns read access time, dual-voltage operation (3.0–3.6 V or 4.5–5.5 V), and JEDEC-standard PLCC-32 packaging. It delivers TTL-compatible outputs at 3.0 V and supports rapid programming at 100 µs/byte, making it suitable for battery-powered portable systems requiring low-power nonvolatile storage.
For engineers reviewing the AT27LV256A-55JC datasheet, AT27LV256A-55JC pinout, AT27LV256A-55JC application, or AT27LV256A-55JC equivalent, key selection considerations include its 55 ns access timing under 3.3 V, <1 µA typical standby current, pin compatibility with AT27C256R, 28–32-pin JEDEC package options, and integrated product identification code for automated programming.
Technical Context
The AT27LV256A-55JC implements a CMOS-based OTP memory architecture with two-line control (CE/OE), enabling bus contention avoidance in multi-device systems. Its dual-supply capability allows seamless integration into mixed-voltage designs-operating at 3.3 V for low-power portables while maintaining TTL-level output compatibility with 5 V logic.
It uses Atmel's Rapid™ Programming Algorithm with 100 µs/byte typical programming time and supports product identification via A9/VH and A0 toggling to read manufacturer (0x1E) and device code (0x8C). Programming requires VCC = 6.5 V and VPP = 13.0 V, with strict sequencing (VCC applied before/with VPP).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 262,144-bit (32K × 8) OTP EPROM - fixed, non-erasable storage for firmware or boot code. |
| Read Access Time | 55 ns max at VCC = 3.0–3.6 V - enables direct interface with 15–18 MHz microcontrollers without wait states. |
| Supply Voltage Range | 3.0–3.6 V or 4.5–5.5 V - supports dual-voltage system design and hot-plug compatibility across 3 V and 5 V hosts. |
| Standby Current | 20 µA max (typical <1 µA at 3.3 V) - extends battery life in portable/embedded applications during idle periods. |
| Programming Speed | 100 µs/byte typical - reduces production programming time versus standard EPROMs; verified per Rapid™ algorithm. |
| ESD Protection | 2,000 V HBM - ensures robustness during handling and board assembly in industrial environments. |
| Operating Temperature | -40°C to +85°C (Industrial grade) - qualified for use in automotive body control, industrial PLCs, and outdoor equipment. |
Pinout & Package
AT27LV256A-55JC is supplied in a 32-lead Plastic J-Leaded Chip Carrier (PLCC) package per JEDEC MS-016 AE. Pins 1 and 17 are no-connect (NC) and must remain unconnected on PCB layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus supporting full 32K address space; TTL/CMOS compatible with VIH ≥ 2.0 V. |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus; VOH ≥ 2.4 V at IOH = –2.0 mA ensures reliable interfacing with 5 V TTL logic. |
| CE | Chip Enable | Active-low chip select; controls device activation and power state transition between active/standby modes. |
| OE | Output Enable | Active-low output gate; enables high-impedance tri-state when deasserted to prevent bus contention. |
| VCC | Power Supply | Primary supply input (3.0–3.6 V or 4.5–5.5 V); requires local 0.1 µF ceramic decoupling per device. |
| VPP | Programming Voltage | 13.0 V ± 0.25 V input during programming; must be sequenced after VCC and decoupled with 0.1 µF capacitor. |
| GND | Ground Reference | Signal and power ground reference; requires low-inductance connection to minimize noise coupling. |
| NC (Pins 1, 17) | No Connect | Physically present but internally unconnected; must not be soldered or routed on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC Pin Compatibility | Direct replacement for AT27C256R in existing 28-pin SOIC/TSOP or 32-pin PLCC layouts - no PCB redesign needed. |
| Rapid™ Programming | 100 µs/byte typical programming time with auto-verify loop - improves manufacturing throughput and yield consistency. |
| Integrated ID Code | Manufacturer ID (0x1E) and Device ID (0x8C) readable via A9/VH and A0 toggle - enables automatic algorithm selection in universal programmers. |
| Low-Power Standby | <1 µA typical ICC at 3.3 V - eliminates need for external power gating in always-on embedded systems. |
| TTL-Compatible Outputs at 3.0 V | VOH ≥ 2.4 V at IOL = 2.0 mA - permits direct connection to legacy 5 V microcontrollers without level shifters. |
Applications
| Portable Medical Devices | Industrial PLC Firmware Storage |
|---|---|
|
Use Scenario: Battery-powered handheld diagnostic tools requiring secure, nonvolatile storage of calibration tables and boot firmware. IC Role / Device Role / Timing Role: OTP EPROM providing read-only program memory with guaranteed data retention over 10+ years and immunity to accidental overwrite. Use Value: 55 ns access time enables real-time sensor data processing; <1 µA standby current extends single-charge battery life beyond 6 months. |
Use Scenario: Factory-floor programmable logic controllers where firmware must survive vibration, EMI, and wide temperature swings. IC Role / Device Role / Timing Role: Nonvolatile configuration memory holding ladder logic and I/O mapping, accessed during cold start and watchdog reset recovery. Use Value: 2,000 V ESD rating and –40°C to +85°C operation ensure reliability in harsh industrial environments; PLCC-32 package resists mechanical stress better than SOIC. |
| Legacy System Upgrades | Embedded Network Interface Modules |
|
Use Scenario: Retrofitting older 5 V systems with lower-power alternatives while retaining existing PCB footprint and logic interfaces. IC Role / Device Role / Timing Role: Drop-in voltage-flexible replacement for AT27C256R, delivering identical pinout and timing behavior at reduced power. Use Value: Dual-voltage support (3.3 V or 5 V) allows reuse of legacy schematics and layout; same programming equipment eliminates tooling changes. |
Use Scenario: Compact Ethernet or CAN node modules where board space and thermal budget constrain memory selection. IC Role / Device Role / Timing Role: Boot ROM storing MAC initialization code and protocol stack startup routines, accessed during power-on reset sequence. Use Value: TSOP/SOIC/PLCC package flexibility allows optimal form factor choice; 29 mW max active power at 5 MHz minimizes thermal load near PHY ICs. |
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 | 5 V only (4.5–5.5 V), 70 ns access, 28-pin PDIP - no low-voltage operation or 3.3 V compatibility. | Requires dedicated 5 V rail; unsuitable for battery-powered or dual-voltage systems. | Select when legacy 5 V design prohibits voltage scaling and PLCC-32 footprint is unavailable. |
| MX29LV256ETTI-70G | 3 V Flash (not OTP), 70 ns access, 48-pin TSOP - supports in-system reprogramming and sector erase. | Enables field firmware updates but introduces complexity in write-protection and endurance management. | Select when field-upgradable firmware is required; avoid if security against unauthorized modification is critical. |
Compared with AT27C256R-70PC, the AT27LV256A-55JC enables lower system power and broader voltage interoperability; compared with MX29LV256ETTI-70G, it offers simpler, tamper-resistant firmware storage without flash wear-out concerns or erase-cycle overhead.
Availability
AT27LV256A-55JC is available at Aetrix Electronics and suitable for industrial automation, portable instrumentation, and legacy system upgrades requiring stable component supply, long-term obsolescence mitigation, and JEDEC-standard OTP memory with proven field reliability.
Supply support for AT27LV256A-55JC 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 company specializing in microcontrollers, nonvolatile memory, and secure authentication devices for industrial, automotive, and consumer applications.
The AT27LV256A belongs to Atmel's low-voltage OTP EPROM product line, designed specifically for portable and mixed-voltage embedded systems needing cost-effective, secure, and unalterable firmware storage with minimal power consumption.
FAQ
What is the maximum operating voltage for VPP on the AT27LV256A-55JC?
The AT27LV256A-55JC requires VPP = 13.0 V ± 0.25 V during programming, with absolute maximum rating of +14.0 V on A9 and VPP pins. Exceeding 13.25 V risks unreliable programming or latent damage; the device must never be operated with VPP > 14.0 V, even transiently.
Can the AT27LV256A-55JC operate reliably at 3.0 V supply voltage?
Yes, the AT27LV256A-55JC is fully specified for operation across 3.0 V to 3.6 V. At VCC = 3.0 V, its read access time remains ≤55 ns, standby current stays below 20 µA, and outputs meet TTL VOH/ VOL thresholds - all verified per datasheet Conditions Table on page 4.
Is the AT27LV256A-55JC pin-compatible with the AT27C256R in PLCC-32 packages?
Yes, the AT27LV256A-55JC is explicitly designed as JEDEC-pin-compatible with AT27C256R in 32-lead PLCC. Pin functions (A0–A14, O0–O7, CE, OE, VCC, GND, VPP) match identically, and NC pins (1, 17) align - enabling direct substitution without layout changes.
Does the AT27LV256A-55JC support both commercial and industrial temperature ranges?
Yes, the "J" suffix in AT27LV256A-55JC denotes the industrial temperature grade (–40°C to +85°C), validated per JEDEC JESD22-A108. The device undergoes extended burn-in and parametric testing across this full range, ensuring stability in automotive under-hood and factory-floor applications.
How does the Integrated Product Identification Code function on the AT27LV256A-55JC?
The AT27LV256A-55JC provides Manufacturer ID (0x1E) and Device ID (0x8C) via its O0–O7 outputs when A9 is driven to VH (12.0 V) and A0 is toggled. This feature allows universal programmers to auto-detect the device type and apply correct programming algorithms without manual configuration - a capability confirmed in datasheet pages 8–9.
AT27LV256A-55JC 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:
- 55 ns
- Voltage - Supply:
- 3V ~ 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)
AT27LV256A-55JC FAQ
1.How can I place an order for AT27LV256A-55JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27LV256A-55JC 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 AT27LV256A-55JC reliable?
The price and inventory of AT27LV256A-55JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27LV256A-55JC is usually 5 days.
3.What payment methods are accepted for AT27LV256A-55JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27LV256A-55JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27LV256A-55JC?
AT27LV256A-55JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27LV256A-55JC 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 AT27LV256A-55JC?
For technical support, including AT27LV256A-55JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27LV256A-55JC requirements.
6.How does Aetrix verify that AT27LV256A-55JC is sourced from the original manufacturer or authorized distributors?
All AT27LV256A-55JC 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 AT27LV256A-55JC meets industry standards.
7.What is the process for return or replacement of AT27LV256A-55JC?
All AT27LV256A-55JC units undergo pre-shipment inspection (PSI). If there is an issue with AT27LV256A-55JC, 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 AT27LV256A-55JC part is unused and in its original packaging.
Return procedure for AT27LV256A-55JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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