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Microchip Technology AT27LV256A-70JC
- Part No.:
- AT27LV256A-70JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT27LV256A-70JC.pdf
- Description:
- IC EPROM 256KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,068
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Product details
Overview
AT27LV256A-70JC from Atmel is a 262,144-bit (32K × 8) one-time programmable EPROM optimized for low-voltage battery-powered systems, featuring 70 ns read access time at 3.0–3.6 V, dual-voltage operation (3.0–3.6 V or 4.5–5.5 V), and JEDEC-standard 32-lead PLCC packaging. It delivers TTL/CMOS-compatible I/O, <1 µA typical standby current at 3.3 V, and rapid 100 µs/byte programming.
For engineers reviewing the AT27LV256A-70JC datasheet, AT27LV256A-70JC pinout, AT27LV256A-70JC application, or AT27LV256A-70JC equivalent, this page provides verified timing, power, compatibility, and package-specific design facts - including PLCC pin mapping, dual-supply interface behavior, OTP programming constraints, and industrial temperature support (−40°C to +85°C).
Technical Context
The AT27LV256A-70JC implements a two-line control architecture (CE and OE) enabling bus contention avoidance in shared-memory systems. Its address decoding covers A0–A14 (15-bit), supporting full 32K-byte addressing with NC pins on PLCC positions 1 and 17.
It operates in five distinct modes: Read, Output Disable, Standby, Rapid Program, and Product Identification - each defined by specific CE/OE/VPP/VCC logic states. Programming requires VCC = 6.5 V and VPP = 13.0 V, while read/standby modes strictly require VCC within 3.0–3.6 V or 4.5–5.5 V ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 262,144 bits (32K × 8), fixed OTP organization - no rewrites, supports single-program system firmware storage. |
| Read Access Time | 70 ns max at VCC = 3.0–3.6 V - enables direct interface with 14 MHz microcontrollers without wait states. |
| Supply Voltage Range | 3.0–3.6 V (low-power mode) or 4.5–5.5 V (5V legacy compatibility) - supports mixed-voltage board designs. |
| Standby Current | 20 µA max (CMOS CE), <1 µA typical at 3.3 V - critical for battery-backed embedded retention. |
| Programming Speed | 100 µs/byte typical using Rapid™ algorithm - reduces production programming cycle time vs. standard EPROMs. |
| Operating Temperature | −40°C to +85°C (industrial grade) - validated for automotive control modules and industrial PLCs. |
| ESD Protection | 2,000 V HBM - ensures robustness during handling and PCB assembly in non-ESD-controlled environments. |
Pinout & Package
AT27LV256A-70JC uses a 32-lead Plastic J-Leaded Chip Carrier (PLCC) per JEDEC MS-016 AE. Pins 1 and 17 are No Connect (NC) and must remain unconnected. VPP is dedicated to programming voltage (13.0 V) and must be isolated from VCC during normal read operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus - fully decodes 32K locations; all must be stable before CE/OE assertion. |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus - outputs valid only when CE = OE = VIL; high-Z otherwise. |
| CE | Chip Enable | Active-low primary chip select - controls device activation and entry into Rapid Program mode when pulsed. |
| OE | Output Enable | Active-low output gate - allows multiple devices on same data bus; independent of CE timing. |
| VPP | Programming Voltage | 13.0 V input required only during programming - must be applied after VCC and removed before VCC. |
| VCC | Power Supply | 3.0–3.6 V or 4.5–5.5 V - powers logic and I/O; supplies 8 mA active current at 5 MHz (3.6 V). |
| GND | Ground Reference | Signal and power return - requires local 0.1 µF ceramic bypass capacitor per device. |
| NC (Pins 1, 17) | No Connect | Physically present but internally unconnected - must not be soldered or routed. |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC Pin Compatibility | Direct replacement for AT27C256R in 32-lead PLCC sockets - no PCB redesign needed for 5V-to-3.3V migration. |
| Rapid™ Programming | 100 µs/byte typical - cuts programming time by >90% vs. conventional EPROM algorithms, improving manufacturing throughput. |
| Integrated ID Code | Manufacturer byte (0x1E) and device code (0x8C) accessible via A9/VH and A0 toggle - enables auto-detection in universal programmers. |
| Dual-Voltage I/O | TTL-level outputs at VCC = 3.0 V - interoperable with 5V logic without level shifters in mixed-supply systems. |
| Industrial Temp Support | Rated −40°C to +85°C - qualified for under-hood automotive ECUs and factory-floor industrial controllers. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Programmable Logic Controller (PLC) |
|---|---|
Use Scenario: Storing calibrated fuel injection maps and diagnostic lookup tables in engine management systems. IC Role / Device Role / Timing Role: OTP firmware storage with guaranteed data retention over 10+ years and immunity to accidental overwrite. Use Value: Eliminates need for battery-backed SRAM or EEPROM wear leveling; supports field updates via reprogramming stations. |
Use Scenario: Holding ladder logic firmware and I/O configuration data in modular PLC backplanes. IC Role / Device Role / Timing Role: Nonvolatile program memory with 70 ns access enabling real-time scan-cycle execution at 10 kHz. Use Value: Enables deterministic scan times and eliminates boot delays associated with serial flash loading. |
| Medical Diagnostic Instrument Boot ROM | Legacy Industrial Communication Module |
Use Scenario: Securing boot code and calibration constants in portable ultrasound or ECG analyzers. IC Role / Device Role / Timing Role: Low-power OTP memory with <1 µA standby draw - extends battery life between charges. Use Value: Meets IEC 60601-1 leakage current limits while maintaining fast wake-from-standby response. |
Use Scenario: Replacing obsolete 27C256 EPROMs in RS-485 gateway modules operating in 5V-only infrastructure. IC Role / Device Role / Timing Role: Pin- and function-compatible drop-in upgrade with identical SOIC/TSOP footprints. Use Value: Reduces BOM obsolescence risk without modifying existing PCB layouts or firmware drivers. |
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 supply (4.5–5.5 V), no low-voltage mode; same 70 ns speed and PLCC-32 package. | Requires dedicated 5V rail; unsuitable for battery-powered or dual-voltage systems. | Select when legacy 5V-only design prohibits voltage scaling and VPP = 12.5 V programming is acceptable. |
| MX29LV256DTTC-70G | 3V Flash (not OTP), 70 ns access, 32-pin TSOP; supports 100K write cycles and sector erase. | Enables field firmware updates; lacks OTP security and requires different command protocol. | Choose for reprogrammable applications where data integrity during power loss is managed via hardware reset sequencing. |
Compared with AT27C256R-70PC, the AT27LV256A-70JC adds 3.3V operation and lower standby power but retains identical pinout and programming flow; versus MX29LV256DTTC-70G, it trades reprogrammability for permanent data lock and simpler interface logic.
Availability
AT27LV256A-70JC is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLCs, medical diagnostic instruments, and legacy communication modules requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for AT27LV256A-70JC 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) designed high-reliability nonvolatile memory and microcontroller solutions for industrial, automotive, and communications markets before its 2016 acquisition.
The AT27LV256A product line targets cost-sensitive, long-lifecycle embedded systems requiring secure, unalterable firmware storage with minimal power overhead - especially where battery operation or mixed-voltage compatibility is essential.
FAQ
What is the maximum allowed VPP voltage for programming the AT27LV256A-70JC?
The AT27LV256A-70JC requires VPP = 13.0 ± 0.25 V during programming, with absolute maximum rating of +14.0 V on A9 and VPP pins. Exceeding 13.25 V risks oxide damage and premature device failure; proper regulation and 0.1 µF local decoupling are mandatory per datasheet Section 7.
Can the AT27LV256A-70JC operate reliably at 3.0 V supply voltage?
Yes, the AT27LV256A-70JC is fully specified down to 3.0 V for read operations, delivering ≤70 ns access time and <1 µA typical standby current. DC characteristics including VOL, VOH, and ICC are guaranteed across the full 3.0–3.6 V range per Table 4 on page 4 of the datasheet.
Is the AT27LV256A-70JC pin-compatible with the AT27C256R in PLCC packages?
Yes, the AT27LV256A-70JC is JEDEC-pin-compatible with the AT27C256R in 32-lead PLCC (32J) packages, sharing identical pin functions, spacing, and NC assignments (Pins 1 and 17). This enables direct socket replacement in existing 5V designs upgraded to 3.3V operation.
Does the AT27LV256A-70JC support industrial temperature range operation?
Yes, the "I" suffix in ordering codes denotes industrial temperature grade, and AT27LV256A-70JC is explicitly rated for −40°C to +85°C operation per Ordering Information table (page 10). All AC/DC parameters, including tACC and ISB, are guaranteed across this full range.
What is the purpose of the Integrated Product Identification Code in the AT27LV256A-70JC?
The AT27LV256A-70JC embeds a Manufacturer ID (0x1E) and Device Code (0x8C) readable via A9 = 12.0 V and A0 toggling. This allows automated programmers to verify part identity and select correct voltage profiles, preventing misprogramming and ensuring traceability in high-volume manufacturing.
AT27LV256A-70JC 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:
- 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-70JC FAQ
1.How can I place an order for AT27LV256A-70JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27LV256A-70JC 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-70JC reliable?
The price and inventory of AT27LV256A-70JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27LV256A-70JC is usually 5 days.
3.What payment methods are accepted for AT27LV256A-70JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27LV256A-70JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27LV256A-70JC?
AT27LV256A-70JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27LV256A-70JC 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-70JC?
For technical support, including AT27LV256A-70JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27LV256A-70JC requirements.
6.How does Aetrix verify that AT27LV256A-70JC is sourced from the original manufacturer or authorized distributors?
All AT27LV256A-70JC 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-70JC meets industry standards.
7.What is the process for return or replacement of AT27LV256A-70JC?
All AT27LV256A-70JC units undergo pre-shipment inspection (PSI). If there is an issue with AT27LV256A-70JC, 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-70JC part is unused and in its original packaging.
Return procedure for AT27LV256A-70JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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