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Infineon Technologies CY62256LL-70SNXC
- Part No.:
- CY62256LL-70SNXC
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CY62256LL-70SNXC.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,069
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Product details
Overview
CY62256LL-70SNXC from Cypress Semiconductor is a 256K-bit (32K × 8) CMOS static RAM with 70 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 memory subsystems used in industrial controllers and legacy instrumentation.
For engineers reviewing the CY62256LL-70SNXC datasheet, CY62256LL-70SNXC pinout, CY62256LL-70SNXC application, or CY62256LL-70SNXC equivalent, key selection criteria include verified 70 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 package footprint for space-constrained PCB layouts.
Technical Context
The CY62256LL-70SNXC implements a full CMOS 32K × 8 SRAM array with dual-decode architecture (512 × 512), integrated sense amplifiers, and input buffers supporting TTL-level inputs. Its automatic power-down activates when CE is HIGH, reducing ICC to ≤28 µW without external circuitry.
Read operations require CE and OE LOW with WE HIGH; write operations require CE and WE LOW while OE may be HIGH or LOW. All 15 address lines (A0–A14) and 8 bidirectional I/O lines are fully specified for 5V ±10% supply across –40°C to +85°C, with guaranteed tAA = 70 ns and tHZOE = 25 ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K words × 8 bits - supports byte-wide data bus interfacing with 8-bit MCUs and peripherals |
| Access Time (tAA) | 70 ns max - ensures timing compliance with 14 MHz Z80, 8051, and 68K-based systems |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5V logic rails and tolerant of ±10% regulation variation |
| Standby Current (ISB2) | 28 µW max at 85°C - enables ultra-low-power retention in battery-backed or intermittently powered systems |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade reliability without derating |
| Input/Output Compatibility | TTL-compatible - eliminates level-shifting requirements when interfacing with legacy 5V logic families |
| Package | 28-pin narrow SOIC (450-mil width) - surface-mount footprint with 1.27 mm pitch for automated assembly |
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 accepting 0x0000–0x7FFF; decoded internally to select one of 32,768 locations |
| I/O0–I/O7 | Bidirectional Data Line | Tri-state I/O pins functioning as inputs during write, outputs during read, high-Z when deselected |
| CE | Chip Enable (active LOW) | Primary chip-select signal; asserts internal power-down when HIGH, enabling zero-bus-load standby |
| OE | Output Enable (active LOW) | Controls output driver enable; must be LOW for read data to appear on I/O pins |
| WE | Write Enable (active LOW) | Controls direction of I/O pins; LOW initiates write, HIGH enables read or high-Z state |
| VCC | Power Supply | +5V supply pin; decoupling capacitor required within 10 mm for stable 70 ns operation |
| GND | Ground Reference | Signal and power ground return; separate from system analog ground per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Automatic CE Power-Down | Reduces ICC to ≤28 µW without external control logic or sleep-mode software overhead |
| Three-State Output Drivers | Enable direct connection to shared 8-bit data buses without external transceivers or bus switches |
| 70 ns Guaranteed Access | Meets timing budgets of legacy 8-bit and 16-bit microcontrollers operating up to 14 MHz |
| Industrial Temperature Range | Validated operation from –40°C to +85°C with no parameter derating or thermal margin loss |
| TTL-Compatible I/O | Accepts standard 0.8 V / 2.0 V logic thresholds and drives 1.0 mA / 2.1 mA loads directly |
Applications
| Industrial PLC Memory Buffer | Legacy Medical Instrument Data Log |
|---|---|
Use Scenario: Stores real-time sensor readings and control state variables in programmable logic controllers deployed in factory automation cabinets. IC Role / Device Role / Timing Role: Non-volatile backup buffer (with external battery) providing deterministic 70 ns read/write latency for cyclic scan execution. Use Value: Enables deterministic 10 ms scan cycles without wait states, leveraging CE-driven power-down between scans to reduce thermal load. |
Use Scenario: Captures waveform snapshots from ECG or EEG front-ends in portable diagnostic devices requiring long battery life. IC Role / Device Role / Timing Role: High-reliability scratchpad memory holding pre-processed samples before DMA transfer to flash or host MCU. Use Value: 28 µW standby current extends battery runtime by >30% versus comparable 55 ns SRAMs under intermittent acquisition duty cycles. |
| Avionics Display Frame Buffer | Test Equipment Pattern Generator |
Use Scenario: Holds rasterized display data for monochrome cockpit displays operating in extended temperature environments. IC Role / Device Role / Timing Role: Dual-port accessible memory (via CE/OE toggling) synchronized to display controller pixel clock. Use Value: Industrial-grade temperature qualification ensures uninterrupted frame updates across –40°C cold-soak to +85°C avionics bay conditions. |
Use Scenario: Stores digital stimulus patterns for automated test equipment generating repetitive digital vectors at 14 MHz. IC Role / Device Role / Timing Role: Static pattern store accessed synchronously with pattern generator state machine using A0–A14 address sequencing. Use Value: 70 ns tAA guarantees setup/hold margins for 14 MHz pattern clocks, eliminating timing violations in production test fixtures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar static RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISSI IS62C256AL-70QLI | Same 32K × 8 organization, 70 ns speed, but 2.7–5.5 V supply range and 35 µA ISB2 (vs. 28 µW) | Supports mixed-voltage systems; higher standby current limits use in ultra-low-power battery hold-up | Select if wider VCC range or availability from alternate source is prioritized over lowest ISB2 |
| ON Semiconductor MCM62C256CJ-70 | Same pinout and timing, but rated only for commercial temp (0°C to 70°C) and higher ISB2 (100 µA) | Suitable for lab-grade or non-industrial equipment; not qualified for extended temperature operation | Select only for cost-sensitive commercial applications where industrial temp rating is unnecessary |
Compared with IS62C256AL-70QLI and MCM62C256CJ-70, the CY62256LL-70SNXC delivers the lowest verified standby power (28 µW) and full industrial temperature support in a drop-in narrow SOIC-28 package-critical for thermally constrained or battery-retained embedded systems.
Availability
CY62256LL-70SNXC is available at Aetrix Electronics and suitable for industrial PLCs, legacy medical instruments, avionics displays, and automated test equipment requiring stable component supply across extended lifecycle programs.
Supply support for CY62256LL-70SNXC 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 programmable solutions for industrial, automotive, and communications infrastructure.
The CY62256 family was engineered specifically for drop-in replacement of aging 28-pin SRAMs in 5V legacy systems, emphasizing timing predictability, low standby power, and industrial temperature robustness without architectural compromise.
FAQ
Is CY62256LL-70SNXC pin-compatible with the original CY62256-70SN?
Yes. CY62256LL-70SNXC uses identical 28-pin narrow SOIC pinout, address/data/control signal mapping, and electrical timing specifications as the base CY62256-70SN. The "LL" suffix denotes lower standby current (28 µW vs. 5 mW), and "XC" indicates industrial temperature grade (–40°C to +85°C), both fully backward-compatible.
Does this SRAM require an external clock or refresh circuitry?
No. As a static RAM, CY62256LL-70SNXC retains data indefinitely while powered and selected, with no refresh cycles, clocks, or periodic access required. Data persistence relies solely on stable VCC and CE control-no timing controller or DRAM-style refresh logic is needed.
Can OE and WE be tied together for simplified control?
No. OE and WE serve distinct functions: OE controls output driver enable (read data visibility), while WE controls write/read mode. Tying them together prevents independent control of read enable and write strobe, violating timing requirements for valid read cycles and risking bus contention during writes.
What is the maximum sustained data throughput achievable?
With 70 ns cycle time and no wait states, CY62256LL-70SNXC supports up to 14.3 MB/s sustained throughput (1/70 ns × 8 bits). Real-world throughput depends on bus arbitration, controller overhead, and CE/OE assertion timing-but the device itself imposes no bottleneck beyond its 70 ns tRC specification.
CY62256LL-70SNXC 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:
- 70ns
- Access Time:
- 70 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOIC
CY62256LL-70SNXC FAQ
1.How can I place an order for CY62256LL-70SNXC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY62256LL-70SNXC 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-70SNXC reliable?
The price and inventory of CY62256LL-70SNXC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY62256LL-70SNXC is usually 5 days.
3.What payment methods are accepted for CY62256LL-70SNXC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY62256LL-70SNXC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY62256LL-70SNXC?
CY62256LL-70SNXC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY62256LL-70SNXC 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-70SNXC?
For technical support, including CY62256LL-70SNXC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY62256LL-70SNXC requirements.
6.How does Aetrix verify that CY62256LL-70SNXC is sourced from the original manufacturer or authorized distributors?
All CY62256LL-70SNXC 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-70SNXC meets industry standards.
7.What is the process for return or replacement of CY62256LL-70SNXC?
All CY62256LL-70SNXC units undergo pre-shipment inspection (PSI). If there is an issue with CY62256LL-70SNXC, 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-70SNXC part is unused and in its original packaging.
Return procedure for CY62256LL-70SNXC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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