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Infineon Technologies CY62256LL-55ZXI
- Part No.:
- CY62256LL-55ZXI
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
CY62256LL-55ZXI.pdf
- Description:
- IC SRAM 256KBIT PAR 28TSOP I
- Quantity:
- Payment:
- Shipping:
Inventory:4,633
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Product details
Overview
CY62256LL-55ZXI 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 power (≤5 µA). It serves as nonvolatile data buffer or working memory in embedded controllers, instrumentation, and legacy industrial systems requiring TTL-compatible parallel interface and deterministic timing.
For engineers reviewing the CY62256LL-55ZXI datasheet, CY62256LL-55ZXI pinout, CY62256LL-55ZXI application, or CY62256LL-55ZXI equivalent, key selection criteria include guaranteed 55 ns read cycle time, automatic CE-controlled power-down, CMOS/TTL I/O compatibility, and narrow SOIC-28 packaging for space-constrained PCB layouts.
Technical Context
The CY62256LL-55ZXI implements a fully static 32K × 8 memory array with three-state bidirectional I/Os, controlled by independent CE (chip enable), OE (output enable), and WE (write enable) signals. Its architecture supports seamless memory expansion via CE daisy-chaining and eliminates external wait-state logic due to fixed 55 ns tRC and tAA timing.
Power management is handled through dual-mode automatic power-down: when CE is HIGH, ISB2 drops to ≤5 µA (CMOS input condition), reducing active-to-standby power ratio by >99.9%. All DC and AC parameters-including VOH/VOL, VIH/VIL, and tHZOE/tLZCE-are specified across –40°C to +85°C at VCC = 5.0 V ±10%.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K words × 8 bits - provides byte-addressable 256 Kbit capacity with no internal banking or refresh overhead |
| Access Time (tAA) | 55 ns max - guarantees deterministic read latency without clock stretching or arbitration delays |
| VCC Operating Range | 4.5 V to 5.5 V - compatible with standard 5 V TTL/CMOS bus environments and tolerant of supply ripple |
| Standby Current (ISB2) | ≤5 µA at VCC = 5.5 V - enables battery-backed operation for >1 year in low-duty-cycle monitoring systems |
| Operating Temperature | –40°C to +85°C - qualified for industrial control cabinets, motor drives, and factory automation hardware |
| Package Type | 28-pin narrow SOIC (450-mil width) - surface-mount compatible with automated assembly and IPC-7351B footprint standards |
| I/O Interface | TTL-compatible inputs/outputs - interoperable with legacy microcontrollers (e.g., 8051, Z80) without level-shifting circuitry |
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 Lines | Three-state CMOS/TTL I/Os sharing single pins for read/write; high-impedance when CE or OE inactive |
| CE | Chip Enable (active LOW) | Primary selection signal; triggers automatic power-down when HIGH, eliminating need for external sleep control |
| OE | Output Enable (active LOW) | Controls I/O direction only during read cycles; does not affect write operations or power state |
| WE | Write Enable (active LOW) | Directly gates write strobe; write occurs only when CE and WE are simultaneously LOW |
| VCC | Power Supply | 5 V nominal supply pin; decoupling capacitor placement critical for maintaining tRC stability under fast switching |
| GND | Ground Reference | Common return path for all I/O and core logic; requires low-inductance connection to minimize ground bounce |
Key Features
| Feature | Design Value |
|---|---|
| 55 ns Access Time | Enables direct interfacing with 12–18 MHz microcontrollers without wait states or glue logic |
| Automatic CE Power-down | Reduces standby current to ≤5 µA without software intervention or external power-gating circuitry |
| TTL-Compatible I/O | Eliminates level translators when connecting to legacy 5 V microprocessor buses (e.g., 68000, 8086) |
| Three-State Output Drivers | Prevents bus contention in multi-device parallel memory systems; supports shared data bus architectures |
| Industrial Temperature Rating | Validated operation from –40°C to +85°C ensures reliability in uncontrolled ambient environments |
Applications
| Industrial PLC Data Buffer | Medical Instrumentation Memory |
|---|---|
Use Scenario: Stores real-time sensor readings and control setpoints in programmable logic controllers operating in factory-floor enclosures. IC Role / Device Role / Timing Role: Byte-accessible SRAM providing zero-wait-state scratchpad memory for cyclic scan-based ladder logic execution. Use Value: 55 ns tAA ensures deterministic response within 1 ms scan cycles; ≤5 µA ISB2 extends backup battery life during mains failure. |
Use Scenario: Holds calibration coefficients and waveform buffers in portable ECG monitors with battery-only operation. IC Role / Device Role / Timing Role: Low-power static RAM serving as volatile storage for analog front-end digitized samples prior to USB upload. Use Value: Automatic CE power-down reduces average system current by >99% between acquisition bursts; narrow SOIC fits compact PCBs. |
| Legacy Avionics Test Equipment | Automated Test Fixture Controller |
Use Scenario: Provides configuration storage and temporary result logging in MIL-STD-1553B bus analyzers deployed in hangar environments. IC Role / Device Role / Timing Role: Parallel-interface SRAM acting as firmware overlay memory and diagnostic log buffer. Use Value: TTL compatibility ensures drop-in replacement for obsolete 27C256 EPROM sockets; industrial temp rating covers hangar thermal swings. |
Use Scenario: Stores test sequence tables and pass/fail flags in benchtop functional testers used for automotive ECU validation. IC Role / Device Role / Timing Role: Non-refreshing memory holding pattern generator instructions and measurement metadata during high-speed DUT cycling. Use Value: 32K × 8 organization matches common test vector depth requirements; 55 ns access synchronizes with 20 MHz pattern clocks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar static RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IS62C256AL-55QLI | Same 32K × 8 organization and 55 ns speed, but uses 28-pin SOJ package and has higher ISB2 (≤10 µA) | SOJ footprint incompatible with CY62256LL-55ZXI's narrow SOIC layout; requires PCB redesign | Select only if SOJ mounting is already standardized in production line and 5 µA standby savings are noncritical |
| AS6C4008-55PCN | 55 ns access, 32K × 8, but rated only for commercial temperature (0°C to +70°C) and lacks automatic CE power-down | Not suitable for industrial environments; requires external power-gating logic for low-power modes | Acceptable only for cost-sensitive consumer-grade equipment where ambient temperature remains tightly controlled |
Compared with IS62C256AL-55QLI and AS6C4008-55PCN, CY62256LL-55ZXI uniquely combines industrial temperature qualification, automatic CE-triggered power-down, and narrow SOIC packaging-making it the only option that preserves both thermal robustness and board-space efficiency without design compromise.
Availability
CY62256LL-55ZXI is available at Aetrix Electronics and suitable for industrial PLC data buffering, medical instrumentation memory, and legacy avionics test equipment requiring stable component supply across extended product lifecycles.
Supply support for CY62256LL-55ZXI 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 markets.
CY62256LL belongs to Cypress's legacy parallel SRAM product line, engineered specifically for drop-in replacement of obsolete NMOS and early CMOS SRAMs in long-lifecycle embedded systems.
FAQ
Is CY62256LL-55ZXI pin-compatible with the original CY62256-55ZI?
Yes. CY62256LL-55ZXI shares identical pinout, electrical signaling, and timing specifications with CY62256-55ZI, differing only in lower standby current (5 µA vs. 28 µW ≈ 5.6 µA at 5 V) and industrial temperature qualification. No PCB or firmware changes are required for migration.
Does this device require an external clock or refresh circuitry?
No. CY62256LL-55ZXI is a fully static RAM: it retains data indefinitely as long as VCC is applied and requires no clock input or periodic refresh cycles. All timing is controlled solely by CE, OE, and WE signal edges per the documented switching waveforms.
Can CY62256LL-55ZXI operate reliably at 4.5 V supply voltage?
Yes. The device is fully characterized down to 4.5 V across –40°C to +85°C, with guaranteed 55 ns tRC and tAA, VOH ≥2.4 V, and VOL ≤0.4 V under worst-case conditions. No derating or timing margin adjustment is needed at minimum VCC.
What is the maximum capacitive load supported on I/O lines?
The AC specifications assume 100 pF total load capacitance (including PCB trace and scope probe). For reliable 55 ns operation, keep total I/O net capacitance ≤100 pF; exceeding this increases tDOE and tHZOE beyond specification limits and may cause setup/hold violations.
CY62256LL-55ZXI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- MOBL™
- Package/Case:
- 28-TSSOP (0.465", 11.80mm Width)
- Packaging:
- Tray
- 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-55ZXI FAQ
1.How can I place an order for CY62256LL-55ZXI through Aetrix?
Please submit a Request for Quotation (RFQ) for CY62256LL-55ZXI 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-55ZXI reliable?
The price and inventory of CY62256LL-55ZXI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY62256LL-55ZXI is usually 5 days.
3.What payment methods are accepted for CY62256LL-55ZXI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY62256LL-55ZXI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY62256LL-55ZXI?
CY62256LL-55ZXI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY62256LL-55ZXI 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-55ZXI?
For technical support, including CY62256LL-55ZXI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY62256LL-55ZXI requirements.
6.How does Aetrix verify that CY62256LL-55ZXI is sourced from the original manufacturer or authorized distributors?
All CY62256LL-55ZXI 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-55ZXI meets industry standards.
7.What is the process for return or replacement of CY62256LL-55ZXI?
All CY62256LL-55ZXI units undergo pre-shipment inspection (PSI). If there is an issue with CY62256LL-55ZXI, 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-55ZXI part is unused and in its original packaging.
Return procedure for CY62256LL-55ZXI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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