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Cypress Semiconductor Corp CY62256NLL-55SNXET
- Part No.:
- CY62256NLL-55SNXET
- Manufacturer:
- Cypress Semiconductor Corp
- Category:
- Memory
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Description:
- IC SRAM 256KBIT PARALLEL 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
CY62256NLL-55SNXET from Infineon Technologies (formerly Cypress Semiconductor) is a 256-Kbit (32 K × 8) high-speed CMOS static RAM with 55 ns access time, 4.5 V to 5.5 V operation, and industrial temperature range (–40 °C to +85 °C). It features automatic CE-controlled power-down (82.5 µW max standby), TTL-compatible I/O, and tristate outputs-used in embedded controllers, industrial PLCs, and legacy instrumentation requiring non-volatile SRAM buffering.
For engineers reviewing the CY62256NLL-55SNXET datasheet, CY62256NLL-55SNXET pinout, CY62256NLL-55SNXET application, or CY62256NLL-55SNXET equivalent, key selection criteria include access time vs. power trade-offs, CE/OE/WE control timing compatibility, industrial-grade thermal margin, and 28-pin narrow SOIC package footprint alignment with legacy board layouts.
Technical Context
The CY62256NLL-55SNXET implements a fully static 32K × 8 memory array with asynchronous read/write control via independent CE, OE, and WE signals. Its architecture supports seamless memory expansion through chip enable chaining and output tristating, eliminating bus contention during multi-chip configurations.
All timing parameters-including tAA (55 ns), tACE (55 ns), and tDOE (25 ns)-are guaranteed over –40 °C to +85 °C at VCC = 4.5 V to 5.5 V. The device uses CMOS process technology to achieve low active power (275 mW max) and ultra-low standby current (0.1 µA typical, 10 µA max) under automatic CE-driven power-down mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 256 Kbit (32 K × 8) - provides byte-wide data interface for 8-bit microcontrollers without external data bus multiplexing |
| Access time | 55 ns - enables direct interfacing with 12–15 MHz Z80, 8051, and 68K-family processors without wait states |
| Voltage range | 4.5 V to 5.5 V - compatible with standard 5 V TTL/CMOS logic rails and legacy power supplies |
| Standby current | 82.5 µW max (at 5 V) - reduces system-level idle power by >99% when CE is HIGH, critical for battery-backed systems |
| Operating temp | –40 °C to +85 °C - qualified for industrial automation, motor drives, and factory-floor HMI applications |
| Package | 28-pin narrow SOIC (300-mil) - surface-mount footprint matching legacy PCB land patterns for drop-in replacement |
| Input/Output | TTL-compatible - eliminates level-shifting requirements when interfacing with 5 V microcontrollers and FPGAs |
Pinout & Package
Package: 28-pin narrow SOIC (300-mil), RoHS-compliant, body width 7.5 mm, lead pitch 0.050 inch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address inputs | 15-bit address bus accepting 0x0000–0x7FFF; enables full 32K-word addressing without external decoding |
| I/O0–I/O7 | Bidirectional data lines | Byte-wide data path; tristated when CE HIGH or OE HIGH-supports shared bus architectures |
| CE | Chip enable (active LOW) | Primary selection signal; triggers automatic power-down when HIGH, reducing ICC to µA-level |
| OE | Output enable (active LOW) | Controls I/O direction: LOW → outputs enabled; HIGH → inputs or high-Z state |
| WE | Write enable (active LOW) | Controls R/W mode: LOW + CE LOW → write; HIGH + CE LOW → read; decouples control from address setup |
| VCC | Power supply | +4.5 V to +5.5 V input; powers core logic and I/O buffers; requires local 0.1 µF ceramic bypass |
| GND | Ground reference | Signal and power return; must be connected to low-impedance ground plane to maintain timing integrity |
Key Features
| Feature | Design Value |
|---|---|
| Automatic CE power-down | Reduces standby current to ≤10 µA (industrial grade), enabling long-term battery backup without external sleep controllers |
| 55 ns access time | Meets timing budgets of 12 MHz 8051 derivatives and Z80-based systems without wait-state insertion |
| TTL-compatible I/O | Eliminates need for level translators when interfacing with legacy 5 V microcontrollers, CPLDs, and ASICs |
| Tristate output drivers | Enables direct connection to shared data buses; prevents contention during multi-SRAM or mixed-peripheral configurations |
| Multiple temperature grades | Single part number supports commercial, industrial, and automotive-A/E variants-simplifies BOM consolidation |
Applications
| Industrial PLC Data Buffer | Legacy Instrumentation Memory |
|---|---|
|
Use Scenario: Real-time data logging in programmable logic controllers where volatile memory retains intermediate scan values between cycles. IC Role / Device Role / Timing Role: Asynchronous SRAM buffer holding I/O status, timer counts, and register snapshots during CPU interrupt latency windows. Use Value: 55 ns access ensures deterministic response within 10 µs scan cycles; 82.5 µW standby extends battery life in unpowered backup modes. |
Use Scenario: Storing calibration coefficients and real-time sensor readings in benchtop multimeters and oscilloscopes with 5 V logic architecture. IC Role / Device Role / Timing Role: Byte-accessible scratchpad memory mapped into microcontroller address space for fast coefficient lookup and waveform buffering. Use Value: TTL compatibility avoids level-shifter components; industrial temp rating ensures stable operation inside sealed instrument enclosures. |
| Embedded HMI Display Cache | Motor Drive Control Register Bank |
|
Use Scenario: Caching GUI bitmap tiles and menu state variables in human-machine interface panels using 8-bit MCUs. IC Role / Device Role / Timing Role: Off-chip memory extension providing additional RAM beyond on-die SRAM limits of low-cost microcontrollers. Use Value: Tristate I/O allows sharing with other peripherals on same data bus; narrow SOIC fits constrained front-panel PCB layouts. |
Use Scenario: Holding PWM duty cycle registers, fault flags, and encoder position history in brushless DC motor drives. IC Role / Device Role / Timing Role: Fast-access register bank synchronized to real-time control loop execution (≤100 µs intervals). Use Value: Guaranteed 55 ns read/write timing meets hard real-time deadlines; –40 °C to +85 °C rating withstands drive cabinet thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IS62C256AL-55QLI | 55 ns access, 32 K × 8, 5 V, industrial temp-but uses different pinout (A0–A14 not contiguous; I/O pins interleaved) and lacks automatic CE power-down | Requires PCB redesign due to non-matching pin mapping; higher standby current (100 µA) increases battery drain | Select only if existing layout accommodates alternate pinout and power budget permits higher ISB |
| AS6C4008-55TIN | 55 ns, 512 Kbit (64 K × 8), 5 V, industrial temp-larger density but wider 32-pin SOJ package; no CE power-down | Not pin-compatible; requires socket or footprint change; higher capacity unnecessary for 256 Kbit use cases | Choose only when future-proofing for larger memory or when 32-pin SOJ is already standardized in design |
Compared with IS62C256AL-55QLI and AS6C4008-55TIN, CY62256NLL-55SNXET offers verified pin-for-pin compatibility with legacy Cypress designs, guaranteed CE-driven power-down, and proven thermal reliability across industrial operating conditions-making it the lowest-risk replacement for field-deployed systems.
Availability
CY62256NLL-55SNXET is available at Aetrix Electronics and suitable for industrial PLCs, legacy instrumentation, embedded HMIs, and motor drive control systems requiring stable component supply and long-term lifecycle support.
Supply support for CY62256NLL-55SNXET 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
Infineon Technologies is a global semiconductor leader headquartered in Munich, Germany, specializing in power management, sensing, connectivity, and memory solutions for industrial, automotive, and IoT applications.
CY62256NLL-55SNXET belongs to Infineon's legacy SRAM portfolio-originally developed by Cypress-to serve cost-sensitive, reliability-critical embedded systems where proven 5 V TTL interoperability and industrial temperature resilience are mandatory.
FAQ
Is CY62256NLL-55SNXET pin-compatible with earlier CY62256N versions?
Yes. CY62256NLL-55SNXET maintains identical pinout, electrical characteristics, and timing behavior as the original CY62256N-55LL in 28-pin narrow SOIC. It is a direct replacement with enhanced manufacturing traceability and Infineon's extended product lifecycle commitment.
Does this SRAM require an external refresh circuit?
No. CY62256NLL-55SNXET is a fully static RAM-no refresh cycles are needed. Data retention is maintained indefinitely as long as VCC remains within 4.5 V to 5.5 V and ambient temperature stays within –40 °C to +85 °C, even with CE HIGH and no activity.
What is the maximum clock frequency supported for read/write operations?
The device operates asynchronously-no clock input is required. Maximum effective throughput is determined by access time: for continuous reads, minimum cycle time is 55 ns, supporting up to ~18.2 MHz sustained data rate on a properly terminated 8-bit bus with compatible controller timing margins.
Can CY62256NLL-55SNXET operate at 3.3 V?
No. This part is specified only for 4.5 V to 5.5 V operation. Attempting 3.3 V supply violates absolute maximum ratings and will result in undefined behavior, data corruption, or failure to meet AC timing specifications including tAA and tRC.
CY62256NLL-55SNXET Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Cypress Semiconductor Corp
- Series:
- MOBL™
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM - Asynchronous
- Memory Size:
- 256Kbit
- Memory Organization:
- 32K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 55ns
- Access Time:
- 55 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOIC
CY62256NLL-55SNXET FAQ
1.How can I place an order for CY62256NLL-55SNXET through Aetrix?
Please submit a Request for Quotation (RFQ) for CY62256NLL-55SNXET 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 CY62256NLL-55SNXET reliable?
The price and inventory of CY62256NLL-55SNXET are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY62256NLL-55SNXET is usually 5 days.
3.What payment methods are accepted for CY62256NLL-55SNXET?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY62256NLL-55SNXET transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY62256NLL-55SNXET?
CY62256NLL-55SNXET orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY62256NLL-55SNXET 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 CY62256NLL-55SNXET?
For technical support, including CY62256NLL-55SNXET datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY62256NLL-55SNXET requirements.
6.How does Aetrix verify that CY62256NLL-55SNXET is sourced from the original manufacturer or authorized distributors?
All CY62256NLL-55SNXET 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 CY62256NLL-55SNXET meets industry standards.
7.What is the process for return or replacement of CY62256NLL-55SNXET?
All CY62256NLL-55SNXET units undergo pre-shipment inspection (PSI). If there is an issue with CY62256NLL-55SNXET, 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 CY62256NLL-55SNXET part is unused and in its original packaging.
Return procedure for CY62256NLL-55SNXET:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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