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Infineon Technologies CY62256LL-55SNXI
- Part No.:
- CY62256LL-55SNXI
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CY62256LL-55SNXI.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,594
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Product details
Overview
CY62256LL-55SNXI from Cypress Semiconductor is a 256K-bit (32K × 8) CMOS static RAM with 55 ns access time, 4.5–5.5 V operation, industrial temperature range (–40°C to +85°C), and ultra-low standby current of 5 µA max. It serves as nonvolatile data buffer or working memory in legacy industrial controllers, PLC I/O modules, and embedded instrumentation where pin-compatible SRAM replacement and deterministic timing are required.
For engineers reviewing the CY62256LL-55SNXI datasheet, CY62256LL-55SNXI pinout, CY62256LL-55SNXI application, or CY62256LL-55SNXI equivalent, key selection criteria include verified 55 ns read cycle time, CE/OE/WE three-control logic compatibility, TSOP-1 package footprint, industrial-grade thermal margin, and sub-10 µA standby power under CMOS input conditions.
Technical Context
The CY62256LL-55SNXI implements a full CMOS 32K × 8 asynchronous SRAM architecture with independent active-low chip enable (CE), output enable (OE), and write enable (WE) controls. Its internal 512 × 512 memory array uses dual decoding and sense amplifiers to achieve guaranteed 55 ns tAA and tRC at VCC = 5.0 V and TA = 85°C.
Power management relies on automatic CE-driven power-down mode, reducing ICC to ≤5 µA when CE is HIGH and inputs meet CMOS threshold conditions (VIN > VCC − 0.3 V or VIN < 0.3 V). TTL-compatible I/Os ensure direct interfacing with legacy microcontrollers without level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K words × 8 bits - supports byte-wide data bus interfaces without external multiplexing |
| Access Time (tAA) | 55 ns max - ensures compatibility with 12.5 MHz bus clocks in synchronous systems |
| VCC Operating Range | 4.5 V to 5.5 V - tolerates ±10% supply variation typical in industrial 5 V rails |
| Standby Current (ISB2) | 5 µA max (CMOS inputs) - enables battery-backed operation for >1 year on coin cell |
| Operating Temperature | –40°C to +85°C - qualified for industrial control cabinets and factory-floor environments |
| Package Type | 28-pin TSOP-I (0.400" width) - surface-mount compatible with automated PCB assembly |
| Output Drive | IOH = –1.0 mA / IOL = 2.1 mA - meets TTL voltage thresholds with margin for trace loading |
Pinout & Package
Package: 28-pin Thin Small Outline Package (TSOP-I), 0.400-inch body width, JEDEC MO-153 compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus accepting 0x0000–0x7FFF; no internal latching - requires stable address during CE LOW |
| I/O0–I/O7 | Bidirectional Data Bus | Three-state CMOS I/Os; direction controlled by OE (output when OE = LOW) and WE (input when WE = LOW) |
| CE | Chip Enable (active LOW) | Primary device select; asserts internal power-up and enables address decoding; triggers automatic power-down when HIGH |
| OE | Output Enable (active LOW) | Controls I/O buffer direction only; does not affect internal state or power mode - outputs high-Z when HIGH |
| WE | Write Enable (active LOW) | Controls data flow direction during CE-asserted cycles; LOW = write, HIGH = read; no effect when CE = HIGH |
| VCC | Power Supply | +4.5 V to +5.5 V supply; decoupling capacitor (0.1 µF) required within 10 mm of Pin 28 |
| GND | Ground Reference | Signal and power ground reference; must be connected to low-impedance plane adjacent to VCC |
Key Features
| Feature | Design Value |
|---|---|
| Automatic CE Power-down | Reduces ICC to ≤5 µA without external control logic or sleep-mode software overhead |
| TTL-Compatible I/O | Direct interface with 5 V microcontrollers (e.g., 8051, PIC18F) without level translators |
| Three Independent Enables | Enables flexible memory expansion via CE daisy-chaining and OE/WE-controlled burst reads/writes |
| Low Capacitance I/Os | CIN/COUT ≤6/8 pF - minimizes signal integrity degradation on >10 cm traces at 12.5 MHz |
| Industrial Temperature Qualification | Full AC/DC specs guaranteed from –40°C to +85°C - eliminates derating calculations for field deployments |
Applications
| Industrial PLC I/O Module | Legacy Medical Instrument Buffer |
|---|---|
|
Use Scenario: Real-time analog input sampling and digital output staging in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Working RAM for cyclic scan buffers, holding 32K bytes of process variable history and setpoint tables. Use Value: 55 ns access ensures full 32K buffer read/write completes within one 10 ms PLC scan cycle, even with worst-case bus arbitration delays. |
Use Scenario: Temporary waveform storage in portable ECG analyzers using 8-bit microcontrollers. IC Role / Device Role / Timing Role: High-reliability data buffer between ADC front-end and serial flash storage. Use Value: 5 µA standby current extends single CR2032 battery life to >18 months in sleep mode between patient sessions. |
| Avionics Maintenance Terminal | Factory Automation HMI |
|
Use Scenario: Onboard diagnostics logging in certified aircraft maintenance laptops with constrained thermal envelopes. IC Role / Device Role / Timing Role: Nonvolatile scratchpad memory for fault-code timestamps and sensor calibration offsets. Use Value: –40°C to +85°C rating guarantees operation across hangar-to-flight deck ambient swings without thermal throttling. |
Use Scenario: Touchscreen-based human-machine interface for CNC machine tool control panels. IC Role / Device Role / Timing Role: Display frame buffer and command queue memory interfaced to 8-bit parallel bus MCU. Use Value: TSOP-I package enables compact 2-layer PCB layout with minimal board area versus DIP alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SRAM 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 system-level voltage translation if host uses 5 V logic; unsuitable for direct 5 V bus replacement | Select only if migrating to 3.3 V system architecture with full redesign of power and I/O domains |
| IS62WV2568BLL-55NLI | 55 ns speed, 5 V tolerant I/Os, but 256K × 8 (2 Mbit) density - double the capacity | Higher pin count (32-pin TSOP); requires PCB layout change and firmware address map update | Choose when future-proofing for larger data buffers is prioritized over drop-in compatibility |
Compared with AS6C4008-55TIN and IS62WV2568BLL-55NLI, CY62256LL-55SNXI uniquely delivers verified 5 V operation, industrial temperature compliance, and exact 28-pin TSOP-I footprint - making it the sole option for legacy 5 V industrial designs requiring zero-hardware-change SRAM replacement.
Availability
CY62256LL-55SNXI is available at Aetrix Electronics and suitable for industrial PLC I/O modules, avionics maintenance terminals, and factory automation HMIs requiring stable component supply across extended product lifecycles.
Supply support for CY62256LL-55SNXI 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) is a U.S.-based semiconductor company specializing in memory, microcontrollers, and programmable solutions for industrial and automotive markets.
The CY62256 family was designed specifically for industrial and automotive embedded systems needing reliable, low-power, pin-compatible SRAM replacements with guaranteed timing across wide temperature ranges.
FAQ
Does CY62256LL-55SNXI support battery backup operation?
Yes - its 5 µA maximum standby current (ISB2) under CMOS input conditions enables direct connection to a lithium coin cell (e.g., CR2032) for data retention during main power loss. The device enters automatic power-down when CE is deasserted, maintaining memory contents as long as VCC remains ≥2.0 V, per data retention specification VDR = 2.0 V.
Can CY62256LL-55SNXI be used in place of CY62256-55SN?
Yes - CY62256LL-55SNXI is a direct functional and pin-compatible upgrade to CY62256-55SN, offering identical timing (55 ns), same 28-pin TSOP-I package, and enhanced industrial temperature range (–40°C to +85°C vs. commercial 0°C to +70°C). No PCB or firmware changes are required for migration.
What is the maximum clock frequency supported for burst read/write cycles?
The CY62256LL-55SNXI is an asynchronous SRAM and does not use a clock signal. Its maximum effective bus rate is determined by tRC = 55 ns, supporting up to ~12.5 MHz continuous read/write cycles when interfaced with a controller capable of meeting setup/hold timing (e.g., tSA = 0 ns, tSD = 25 ns). No internal clock circuitry is present.
Is lead-free solder reflow profile information available for this TSOP package?
Yes - CY62256LL-55SNXI is manufactured with lead-free terminations compliant with JEDEC J-STD-020D. Recommended peak reflow temperature is 260°C for 30 seconds maximum, with ramp-up rate ≤3°C/s and cooling rate ≤6°C/s. Full profile details are in Cypress Application Note AN2229 "Lead-Free Reflow Guidelines for Cypress Packages".
CY62256LL-55SNXI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- MOBL™
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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-55SNXI FAQ
1.How can I place an order for CY62256LL-55SNXI through Aetrix?
Please submit a Request for Quotation (RFQ) for CY62256LL-55SNXI 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-55SNXI reliable?
The price and inventory of CY62256LL-55SNXI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY62256LL-55SNXI is usually 5 days.
3.What payment methods are accepted for CY62256LL-55SNXI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY62256LL-55SNXI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY62256LL-55SNXI?
CY62256LL-55SNXI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY62256LL-55SNXI 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-55SNXI?
For technical support, including CY62256LL-55SNXI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY62256LL-55SNXI requirements.
6.How does Aetrix verify that CY62256LL-55SNXI is sourced from the original manufacturer or authorized distributors?
All CY62256LL-55SNXI 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-55SNXI meets industry standards.
7.What is the process for return or replacement of CY62256LL-55SNXI?
All CY62256LL-55SNXI units undergo pre-shipment inspection (PSI). If there is an issue with CY62256LL-55SNXI, 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-55SNXI part is unused and in its original packaging.
Return procedure for CY62256LL-55SNXI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CY62256LL-55SNXI Tags
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