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Infineon Technologies CY62256LL-55ZXIT
- Part No.:
- CY62256LL-55ZXIT
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
CY62256LL-55ZXIT.pdf
- Description:
- IC SRAM 256KBIT PAR 28TSOP I
- Quantity:
- Payment:
- Shipping:
Inventory:3,778
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Product details
Overview
CY62256LL-55ZXIT from Cypress Semiconductor is a 256K-bit (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 in embedded microcontroller systems.
For engineers reviewing the CY62256LL-55ZXIT datasheet, CY62256LL-55ZXIT pinout, CY62256LL-55ZXIT application, or CY62256LL-55ZXIT equivalent, key selection criteria include guaranteed 55 ns read cycle time, low 28 µW standby current at 85°C, CE/OE/WE control logic compatibility with 8-bit microcontrollers, and narrow SOIC-28 packaging for space-constrained PCB layouts.
Technical Context
The CY62256LL-55ZXIT implements a full CMOS 32K × 8 SRAM array with dual-decode architecture (512 × 512), supporting asynchronous random access via address pins A0–A14. Its CE/OE/WE control scheme enables seamless integration into 8-bit data bus systems without external latching.
Power management relies on automatic CE-driven power-down mode, reducing ICC to ≤28 µW when CE is HIGH - a feature validated across –40°C to +85°C with CMOS input thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V) and 6 pF input capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32K words × 8 bits) - supports full 8-bit parallel data interface without multiplexing |
| Access Time | 55 ns - guarantees timing margin for 12 MHz Z80 or 8051-based systems with no wait states |
| VCC Range | 4.5 V to 5.5 V - compatible with standard 5 V TTL/CMOS logic rails and tolerant of ±10% supply variation |
| Standby Current | 28 µW max (at VCC = 5.5 V, TA = 85°C) - enables battery-backed retention in industrial controllers |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade embedded applications without derating |
| Package | 28-pin narrow SOIC (450-mil width, 300-mil body) - surface-mount compatible with IPC-7351B footprint |
| Output Drive | IOL = 2.1 mA / IOH = –1.0 mA - directly interfaces with 74LS/TTL inputs without pull-ups |
Pinout & Package
Package: 28-pin narrow SOIC (450-mil width, 300-mil body), RoHS-compliant, JEDEC MS-012AC compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Input | 15-bit address bus (32K locations); driven by microcontroller address lines with <6 pF loading |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit tri-state data path; high-impedance when CE=HIGH or OE=HIGH, enabling shared bus topology |
| CE | Chip Enable (active LOW) | Primary device select; triggers automatic power-down when HIGH, reducing ICC to ≤28 µW |
| OE | Output Enable (active LOW) | Controls I/O direction: LOW → outputs enabled; HIGH → inputs or high-Z (read/write mode selection) |
| WE | Write Enable (active LOW) | Asserted LOW with CE LOW to initiate write; HIGH during read; controls data bus directionality |
| VCC | Power Supply | +4.5 V to +5.5 V supply; decoupling required within 10 mm of Pin 28 per layout guidelines |
| GND | Ground Reference | Signal and power return; must be connected to solid ground plane adjacent to VCC pin |
Key Features
| Feature | Design Value |
|---|---|
| Automatic CE Power-down | Reduces standby current to ≤28 µW at 85°C - eliminates need for external power gating in always-on nodes |
| TTL-Compatible I/O | VIH ≥ 2.2 V, VOL ≤ 0.4 V at IOL = 2.1 mA - interoperable with legacy 5 V microcontrollers and peripheral ICs |
| Three-State Output Control | Independent OE and CE assertion enables multi-drop bus arbitration without external transceivers |
| Industrial Temperature Rating | Validated operation from –40°C to +85°C - suitable for factory automation PLCs and motor drive controllers |
| Low Capacitance Interface | CIN = 6 pF, COUT = 8 pF - minimizes signal integrity degradation on 50 Ω trace layouts up to 20 MHz |
Applications
| Industrial PLC Memory Expansion | Medical Device Data Buffering |
|---|---|
Use Scenario: Non-volatile data logging in programmable logic controllers with periodic firmware updates and real-time I/O scanning. IC Role / Device Role / Timing Role: Primary 32K × 8 working RAM for ladder logic execution and sensor history storage. Use Value: 55 ns access ensures deterministic scan cycle times under 1 ms; 28 µW standby enables battery backup for >72 hours during AC loss. |
Use Scenario: Temporary waveform capture in portable ECG monitors before SD card transfer. IC Role / Device Role / Timing Role: High-speed circular buffer interfacing directly with 8-bit ADC output bus. Use Value: TTL-compatible I/O eliminates level-shifting; industrial temp rating supports operation in clinical environments up to 40°C ambient. |
| Automotive Body Control Module | Legacy Industrial HMI Controller |
Use Scenario: Storing configuration parameters and fault codes in vehicle door modules operating across –40°C to +105°C under hood conditions. IC Role / Device Role / Timing Role: EEPROM-replacement SRAM with external backup capacitor for non-volatility. Use Value: Validated –40°C to +85°C operation meets AEC-Q100 Grade 3 requirements; 55 ns read supports CAN message buffering at 500 kbps. |
Use Scenario: Replacing obsolete 62256 SRAMs in retrofit panels for CNC machine operator interfaces. IC Role / Device Role / Timing Role: Drop-in replacement for legacy 28-pin DIP SRAMs using SOIC-to-DIP adapter boards. Use Value: Pinout-identical to CY62256-55ZI in narrow SOIC package; same CE/OE/WE timing eliminates firmware changes. |
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, 32K × 8, 5 V, industrial temp - but uses 28-pin TSOP-I (not SOIC) and has 50 µW standby current | Requires PCB footprint redesign; higher standby current limits battery life in portable designs | Select only if TSOP-I mounting is preferred and board area is constrained over thermal performance |
| AS6C4008-55TIN | 55 ns, 512K × 8 (larger density), 5 V, industrial temp - but requires 32-pin SOP and has 100 µW standby | Not pin-compatible; larger memory size unnecessary for 32K applications; higher leakage increases thermal load | Choose only when future-proofing for memory expansion beyond 256K is required and footprint change is acceptable |
Compared with IS62C256AL-55QLI and AS6C4008-55TIN, the CY62256LL-55ZXIT delivers the lowest standby power (28 µW) in a pin-compatible narrow SOIC package, making it optimal for thermally sensitive or battery-dependent industrial systems where footprint and power are co-constrained.
Availability
CY62256LL-55ZXIT is available at Aetrix Electronics and suitable for industrial PLCs, medical data loggers, automotive body controllers, and legacy HMI retrofits requiring stable component supply and long-term obsolescence mitigation.
Supply support for CY62256LL-55ZXIT 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 computing applications.
The CY62256 family was engineered specifically for drop-in replacement of legacy 256K SRAMs in 8-bit microcontroller systems, emphasizing low-power standby, industrial temperature resilience, and pin-for-pin compatibility with industry-standard footprints.
FAQ
Is CY62256LL-55ZXIT pin-compatible with the original CY62256-55ZI in DIP package?
Yes - the CY62256LL-55ZXIT uses the identical 28-pin SOIC pinout as defined in the datasheet for address (A0–A14), data (I/O0–I/O7), and control signals (CE, OE, WE, VCC, GND). No logic or timing changes are required when migrating from DIP to SOIC, though PCB layout must accommodate surface-mount soldering and thermal relief.
Does this SRAM retain data during VCC brown-out below 4.5 V?
Data retention is guaranteed down to VCC = 2.0 V per the datasheet's VDR specification. Below 4.5 V, the device remains functional until VCC drops to 2.0 V, after which it enters data retention mode with ICCDR ≤5 µA (LL version), preserving contents as long as VCC stays ≥2.0 V.
Can OE and WE be tied together for simplified control in microcontroller systems?
No - OE and WE serve distinct functions: OE controls output driver enable/disable (three-state), while WE determines read/write direction. Tying them violates timing requirements (tHZOE ≠ tHZWE) and risks bus contention. The datasheet mandates independent control for reliable operation across all temperature ranges.
What is the maximum clock frequency supported for burst reads using this SRAM?
This is an asynchronous SRAM with no internal clock - it supports continuous read cycles at up to 18.2 MHz (1/55 ns), provided address setup/hold and CE/OE timing margins are met. Microcontroller GPIO timing must satisfy tAA = 55 ns, tOHA = 5 ns, and tHZOE = 25 ns to avoid read corruption.
CY62256LL-55ZXIT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- MOBL™
- Package/Case:
- 28-TSSOP (0.465", 11.80mm 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-TSOP I
CY62256LL-55ZXIT FAQ
1.How can I place an order for CY62256LL-55ZXIT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY62256LL-55ZXIT 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-55ZXIT reliable?
The price and inventory of CY62256LL-55ZXIT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY62256LL-55ZXIT is usually 5 days.
3.What payment methods are accepted for CY62256LL-55ZXIT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY62256LL-55ZXIT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY62256LL-55ZXIT?
CY62256LL-55ZXIT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY62256LL-55ZXIT 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-55ZXIT?
For technical support, including CY62256LL-55ZXIT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY62256LL-55ZXIT requirements.
6.How does Aetrix verify that CY62256LL-55ZXIT is sourced from the original manufacturer or authorized distributors?
All CY62256LL-55ZXIT 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-55ZXIT meets industry standards.
7.What is the process for return or replacement of CY62256LL-55ZXIT?
All CY62256LL-55ZXIT units undergo pre-shipment inspection (PSI). If there is an issue with CY62256LL-55ZXIT, 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-55ZXIT part is unused and in its original packaging.
Return procedure for CY62256LL-55ZXIT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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