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Infineon Technologies CY62256LL-55SNXIT
- Part No.:
- CY62256LL-55SNXIT
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CY62256LL-55SNXIT.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,029
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Product details
Overview
CY62256LL-55SNXIT from Cypress Semiconductor is a 256 Kbit (32K × 8) CMOS static RAM with 55 ns access time, 4.5–5.5 V operation, and industrial temperature range (–40°C to +85°C). It features TTL-compatible I/O, automatic CE-controlled power-down (28 µW max standby), and three-state outputs for bus sharing-used in embedded controllers, industrial PLCs, and legacy instrumentation requiring non-volatile SRAM backup.
For engineers reviewing the CY62256LL-55SNXIT datasheet, CY62256LL-55SNXIT pinout, CY62256LL-55SNXIT application, or CY62256LL-55SNXIT equivalent, key selection criteria include access timing consistency across voltage/temperature, low ISB2 leakage under CMOS input conditions, CE/OE/WE control logic compatibility, and narrow SOIC-28 package footprint for space-constrained PCB layouts.
Technical Context
The CY62256LL-55SNXIT implements a full CMOS 32K × 8 memory array with dual-decode architecture (512 × 512), enabling deterministic 55 ns tAA and tRC timing across its industrial operating range. Its CE/OE/WE control scheme supports asynchronous read/write without external clocks or wait states.
Power management relies on automatic CE-driven transition into ultra-low-power retention mode (ISB2 ≤ 10 µA at VCC = 5.5 V), while TTL-compatible input thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V) ensure interoperability with legacy 5 V logic families without level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32,768 × 8 bits) - supports byte-wide data buses without external multiplexing |
| Access Time | 55 ns max - guarantees deterministic read latency for real-time control loops |
| Voltage Range | 4.5 V to 5.5 V - compatible with standard 5 V supply rails and tolerates ±10% regulation drift |
| Standby Current | 10 µA max (ISB2, CMOS inputs) - enables >1-year battery-backed retention in low-power systems |
| Operating Temp | –40°C to +85°C - qualified for industrial environments without derating |
| Package | 28-pin narrow SOIC (450-mil width) - surface-mount compatible with standard reflow profiles |
| Output Drive | IOH = –1.0 mA, IOL = 2.1 mA - sufficient to drive 10 TTL loads or 20 CMOS inputs directly |
Pinout & Package
Package: 28-pin narrow SOIC (450-mil body width, JEDEC MS-012AC), RoHS-compliant lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus supporting full 32K-word decoding; no external address latching required |
| I/O0–I/O7 | Bidirectional Data Bus | Three-state CMOS I/O pins shared for read/write; high-impedance when CE HIGH or OE HIGH |
| CE | Chip Enable (active LOW) | Primary chip-select signal; initiates automatic power-down when deasserted |
| OE | Output Enable (active LOW) | Controls output buffer direction; asserts data only when CE and OE are both LOW |
| WE | Write Enable (active LOW) | Determines read (WE HIGH) vs. write (WE LOW) mode during CE assertion |
| VCC | Power Supply | 5 V nominal supply; decoupling capacitor required within 10 mm of Pin 28 |
| GND | Ground Reference | Signal and power return path; must be connected to solid ground plane at Pin 14 |
Key Features
| Feature | Design Value |
|---|---|
| Automatic CE Power-down | Reduces ICC to ≤10 µA (ISB2) without external control logic or sleep-mode registers |
| TTL-Compatible I/O | Eliminates need for level shifters when interfacing with 5 V microcontrollers or FPGAs |
| Three-State Output Control | Enables direct connection to shared data buses without external bus transceivers |
| 55 ns Access Consistency | Guaranteed timing across full industrial temperature and voltage range, not just typical conditions |
| Lead-Free Narrow SOIC | Meets RoHS requirements while maintaining legacy PCB footprint compatibility |
Applications
| Industrial PLC Data Buffers | Medical Instrumentation Memory |
|---|---|
|
Use Scenario: Real-time I/O scan buffering in programmable logic controllers where deterministic memory access prevents scan cycle jitter. IC Role / Device Role / Timing Role: Byte-wide SRAM providing zero-wait-state data storage for register mapping and status history. Use Value: 55 ns tAA ensures sub-100 ns worst-case read latency, meeting IEC 61131-3 cycle time budgets under full load. |
Use Scenario: Temporary waveform capture and calibration coefficient storage in portable ECG monitors with battery backup. IC Role / Device Role / Timing Role: Low-leakage SRAM retaining critical settings during main power interruption. Use Value: 10 µA ISB2 enables >18 months of data retention on a single CR2032 coin cell (220 mAh). |
| Avionics Display Controllers | Legacy Test Equipment Firmware Cache |
|
Use Scenario: Frame buffer staging for monochrome cockpit displays operating in extended thermal environments. IC Role / Device Role / Timing Role: High-reliability SRAM interfaced directly to FPGA video pipeline with no external timing glue. Use Value: Industrial temp rating (–40°C to +85°C) and 55 ns timing stability eliminate thermal derating in unheated avionics bays. |
Use Scenario: Storing instrument firmware patches and calibration tables in benchtop oscilloscopes and signal generators. IC Role / Device Role / Timing Role: Non-volatile cache supplementing flash memory to accelerate boot and configuration loading. Use Value: TTL-compatible I/O allows drop-in replacement of obsolete 28-pin DIP SRAMs without board redesign. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar static RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AS6C4008-55TIN | Same 32K × 8 organization and 55 ns speed, but 2.7–3.6 V only; no 5 V tolerance | Requires separate 3.3 V rail; incompatible with legacy 5 V systems | Select only if migrating to 3.3 V architecture and redesigning power delivery |
| IS62WV2568BLL-55NLI | 55 ns speed, industrial temp, but 2.7–3.6 V supply; higher ISB2 (25 µA) | Lacks 5 V interface compatibility; higher standby current reduces battery life | Prefer only when 3.3 V system integration and lower active power outweigh voltage mismatch |
Compared with AS6C4008-55TIN and IS62WV2568BLL-55NLI, the CY62256LL-55SNXIT uniquely supports 5 V operation with TTL-level compatibility and lowest ISB2 (10 µA) among industrial-grade 55 ns SRAMs-making it the sole viable option for drop-in upgrades in legacy 5 V embedded systems requiring long-term data retention.
Availability
CY62256LL-55SNXIT is available at Aetrix Electronics and suitable for industrial PLCs, medical instrumentation, avionics display controllers, and legacy test equipment requiring stable component supply across extended product lifecycles.
Supply support for CY62256LL-55SNXIT 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
Cypress Semiconductor (now part of Infineon Technologies) designs high-reliability memory and mixed-signal ICs for industrial, automotive, and communications infrastructure.
The CY62256 family targets legacy-system memory replacement and industrial control applications where 5 V compatibility, deterministic timing, and long-term supply stability are mandatory design requirements.
FAQ
Is CY62256LL-55SNXIT pin-compatible with CY62256-55SN?
Yes-both use identical 28-pin narrow SOIC pinout and share identical A0–A14, I/O0–I/O7, CE, OE, WE, VCC, and GND assignments. The "LL" suffix denotes lower standby current (10 µA vs. 50 µA) and industrial temperature qualification, but electrical and mechanical interfaces remain fully interchangeable.
What is the maximum capacitive load the I/O pins can drive reliably?
The CY62256LL-55SNXIT specifies COUT ≤ 8 pF and is characterized with 100 pF AC load for timing validation. For reliable 55 ns operation, total trace + load capacitance should not exceed 30 pF; above that, tDOE and tHZOE degrade, risking setup/hold violations in high-speed bus interfaces.
Does this device require an external clock or refresh circuitry?
No-CY62256LL-55SNXIT is a static RAM and requires no clock or refresh signals. Data retention is indefinite as long as VCC remains within 4.5–5.5 V and CE is held HIGH during standby; no periodic access or external timing control is needed.
Can CE and OE be tied together for simplified control?
Yes-tying CE and OE simplifies two-control-line interfaces, but disables independent output gating. This configuration permits reads only (WE HIGH) and blocks writes unless additional logic gates manage WE separately; it also eliminates OE-controlled high-impedance isolation during address changes.
CY62256LL-55SNXIT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOIC
CY62256LL-55SNXIT FAQ
1.How can I place an order for CY62256LL-55SNXIT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY62256LL-55SNXIT 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 CY62256LL-55SNXIT reliable?
The price and inventory of CY62256LL-55SNXIT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY62256LL-55SNXIT is usually 5 days.
3.What payment methods are accepted for CY62256LL-55SNXIT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY62256LL-55SNXIT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY62256LL-55SNXIT?
CY62256LL-55SNXIT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY62256LL-55SNXIT 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 CY62256LL-55SNXIT?
For technical support, including CY62256LL-55SNXIT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY62256LL-55SNXIT requirements.
6.How does Aetrix verify that CY62256LL-55SNXIT is sourced from the original manufacturer or authorized distributors?
All CY62256LL-55SNXIT 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 CY62256LL-55SNXIT meets industry standards.
7.What is the process for return or replacement of CY62256LL-55SNXIT?
All CY62256LL-55SNXIT units undergo pre-shipment inspection (PSI). If there is an issue with CY62256LL-55SNXIT, 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 CY62256LL-55SNXIT part is unused and in its original packaging.
Return procedure for CY62256LL-55SNXIT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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