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Infineon Technologies CY62256LL-70ZXIT
- Part No.:
- CY62256LL-70ZXIT
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
CY62256LL-70ZXIT.pdf
- Description:
- IC SRAM 256KBIT PAR 28TSOP I
- Quantity:
- Payment:
- Shipping:
Inventory:2,458
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Product details
Overview
CY62256LL-70ZXIT from Cypress Semiconductor is a 256K-bit (32K × 8) CMOS static RAM with 70 ns access time, 4.5–5.5 V operation, industrial temperature range (–40°C to +85°C), and ultra-low standby power (28 µW max). It serves as non-volatile cache or buffer memory in embedded controllers, industrial PLCs, and legacy instrumentation requiring TTL-compatible, pin-selectable memory expansion.
For engineers reviewing the CY62256LL-70ZXIT datasheet, CY62256LL-70ZXIT pinout, CY62256LL-70ZXIT application, or CY62256LL-70ZXIT equivalent, key selection criteria include CE/OE/WE three-control timing, automatic power-down behavior, SOIC-28 package compatibility, and 32K × 8 data width alignment with 8-bit microcontroller buses.
Technical Context
The CY62256LL implements a 512 × 512 SRAM array with separate row/column decoders, TTL-compatible input buffers, and three-state output drivers controlled by CE, OE, and WE. Its automatic power-down reduces ICC to ≤0.5 µA when CE is HIGH and inputs are at valid logic levels.
Timing is defined by overlapping CE/WE control: write initiation requires both CE and WE LOW; read requires CE and OE LOW while WE is HIGH. Address setup/hold and output enable delays (tSA = 0 ns, tHZOE = 25 ns) support tight bus cycle integration in 8-bit systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8 bits - matches 8-bit data bus width without byte masking logic |
| Access Time | 70 ns - supports 14.3 MHz bus clock with full address-to-data timing margin |
| VCC Range | 4.5 V to 5.5 V - compatible with standard 5 V TTL/CMOS logic rails |
| Standby Current (ISB2) | 28 µW max at 5 V - enables >10-year battery-backed retention in low-power systems |
| Operating Temperature | –40°C to +85°C - qualified for industrial control cabinet environments |
| Package | 28-pin narrow SOIC (450-mil width) - surface-mount compatible with IPC-7351B footprint |
| Input/Output Compatibility | TTL-level VIH/VIL and VOH/VOL - interoperable with legacy 5 V microcontrollers and FPGAs |
Pinout & Package
Package: 28-pin narrow SOIC (450-mil body width, 300-mil body), RoHS-compliant lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Input | 15-bit address bus supporting 32K-word addressing; no external decoding needed |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit shared data path; high-impedance when CE HIGH or OE HIGH |
| CE | Chip Enable (active LOW) | Primary chip select; enables automatic power-down when deasserted |
| OE | Output Enable (active LOW) | Controls I/O direction: LOW = output, HIGH = input/high-Z |
| WE | Write Enable (active LOW) | Determines R/W mode: LOW = write, HIGH = read (with CE/OE active) |
| VCC | Power Supply | +5 V supply pin; decoupling required within 10 mm of pin 28 |
| GND | Ground Reference | Signal and power ground return; connected to pin 14 |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Power-Down | Reduces standby current to ≤0.5 µA when CE is HIGH, eliminating external sleep control logic |
| Three-Enable Architecture | Independent CE/OE/WE allows flexible bus arbitration and partial memory disable without address remapping |
| TTL-Compatible Interface | VIH = 2.2 V min, VOL = 0.4 V max - ensures reliable interfacing with 5 V MCUs and CPLDs |
| Low Capacitance I/O | CIN = 6 pF, COUT = 8 pF - minimizes signal integrity degradation on 10+ inch PCB traces |
| Industrial Temperature Qualification | Tested across –40°C to +85°C with full AC/DC specs guaranteed - suitable for uncooled factory-floor deployment |
Applications
| Industrial PLC Memory Buffer | Legacy Medical Instrument Data Cache |
|---|---|
|
Use Scenario: Stores real-time sensor acquisition buffers and configuration registers in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Non-volatile SRAM buffer with CE-gated power-down during idle scan cycles. Use Value: Enables 28 µW standby draw during 95% of PLC scan cycle, extending thermal design margin in sealed enclosures. |
Use Scenario: Holds calibration coefficients and waveform history in portable ECG analyzers with battery backup. IC Role / Device Role / Timing Role: Low-leakage memory retaining data during 72-hour battery-only operation. Use Value: 28 µW max ISB2 ensures >10-year data retention on 100 mAh coin cell without refresh circuitry. |
| Avionics Display Controller Frame Buffer | Automotive Body Control Module EEPROM Shadow |
|
Use Scenario: Provides dual-port-accessible frame storage for monochrome cockpit display drivers in certified avionics units. IC Role / Device Role / Timing Role: High-reliability SRAM with 70 ns tAA supporting 14.3 MHz pixel clock timing. Use Value: Meets DO-254 Class B timing closure requirements with zero hold-time violations under vibration stress. |
Use Scenario: Mirrors EEPROM contents for fast read access in vehicle door module firmware, reducing boot latency. IC Role / Device Role / Timing Role: Read-optimized SRAM shadow with CE-controlled selective power gating per subsystem. Use Value: Eliminates 15 ms EEPROM read delay during wake-up, achieving <50 ms system ready time after ignition. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IS62C256AL-70QLI | Same 32K × 8 organization, 70 ns speed, but 2.7–5.5 V VCC range and higher ISB2 (100 µA) | Supports single-supply 3.3 V systems; less suitable for strict 5 V industrial rail stability | Select if migrating to mixed-voltage designs or needing wider VCC tolerance |
| AS6C4008-70TIN | Identical 32K × 8, 70 ns, and SOIC-28 package, but commercial temp only (0°C to 70°C) and higher ICC (55 mA) | Lacks industrial temperature qualification; unsuitable for uncooled industrial deployments | Acceptable only for cost-sensitive consumer-grade equipment with ambient thermal control |
Compared with IS62C256AL-70QLI and AS6C4008-70TIN, the CY62256LL-70ZXIT delivers lower standby power (28 µW vs. ≥100 µW) and guaranteed industrial temperature operation - critical for long-life, thermally constrained embedded systems where power budget and environmental robustness are primary constraints.
Availability
CY62256LL-70ZXIT is available at Aetrix Electronics and suitable for industrial PLCs, medical instrumentation, avionics displays, and automotive body control modules requiring stable component supply across extended product lifecycles.
Supply support for CY62256LL-70ZXIT 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 logic solutions for industrial and automotive markets.
The CY62256 family was designed specifically for high-reliability, low-power SRAM applications in legacy and long-lifecycle embedded systems where pin compatibility, timing predictability, and industrial temperature operation are mandatory.
FAQ
What is the maximum clock frequency supported by CY62256LL-70ZXIT?
The CY62256LL-70ZXIT has a 70 ns access time, enabling reliable operation with bus clocks up to 14.3 MHz (1/70 ns). It does not use a clock signal - timing is asynchronous and governed by CE/OE/WE setup/hold windows defined in the datasheet, such as tSA = 0 ns and tHZOE = 25 ns.
Can CY62256LL-70ZXIT operate at 3.3 V?
No. The CY62256LL-70ZXIT requires 4.5 V to 5.5 V VCC; operation below 4.5 V violates its guaranteed DC and AC specifications. For 3.3 V systems, consider IS62C256AL-70QLI or AS6C4008-70TIN, which specify 2.7–3.6 V or 2.7–5.5 V ranges respectively.
Does CY62256LL-70ZXIT require an external refresh circuit?
No. As a static RAM, the CY62256LL-70ZXIT retains data indefinitely as long as VCC is applied and CE remains LOW during active use. No refresh cycles or external timing circuitry are needed - unlike DRAM - simplifying controller design and reducing BOM count.
Is the SOIC-28 package of CY62256LL-70ZXIT RoHS-compliant?
Yes. The "Z" suffix in CY62256LL-70ZXIT denotes lead-free (Pb-free) construction per JEDEC J-STD-609, with matte tin finish and compliant with EU RoHS Directive 2011/65/EU and China RoHS II. Full material declarations are available upon request.
CY62256LL-70ZXIT 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:
- 70ns
- Access Time:
- 70 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-70ZXIT FAQ
1.How can I place an order for CY62256LL-70ZXIT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY62256LL-70ZXIT 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-70ZXIT reliable?
The price and inventory of CY62256LL-70ZXIT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY62256LL-70ZXIT is usually 5 days.
3.What payment methods are accepted for CY62256LL-70ZXIT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY62256LL-70ZXIT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY62256LL-70ZXIT?
CY62256LL-70ZXIT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY62256LL-70ZXIT 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-70ZXIT?
For technical support, including CY62256LL-70ZXIT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY62256LL-70ZXIT requirements.
6.How does Aetrix verify that CY62256LL-70ZXIT is sourced from the original manufacturer or authorized distributors?
All CY62256LL-70ZXIT 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-70ZXIT meets industry standards.
7.What is the process for return or replacement of CY62256LL-70ZXIT?
All CY62256LL-70ZXIT units undergo pre-shipment inspection (PSI). If there is an issue with CY62256LL-70ZXIT, 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-70ZXIT part is unused and in its original packaging.
Return procedure for CY62256LL-70ZXIT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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