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Infineon Technologies CY62256LL-70ZC
- Part No.:
- CY62256LL-70ZC
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
CY62256LL-70ZC.pdf
- Description:
- IC SRAM 256KBIT PAR 28TSOP I
- Quantity:
- Payment:
- Shipping:
Inventory:3,047
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Product details
Overview
CY62256LL-70ZC from Cypress Semiconductor is a 256 Kbit (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 bidirectional data bus for memory expansion in embedded controllers and instrumentation systems.
For engineers reviewing the CY62256LL-70ZC datasheet, CY62256LL-70ZC pinout, CY62256LL-70ZC application, or CY62256LL-70ZC equivalent, key selection criteria include access timing consistency across voltage/temperature, low ISB2 standby current under CMOS input conditions, and compatibility with legacy 28-pin narrow SOIC footprint designs.
Technical Context
The CY62256LL-70ZC implements a full CMOS 512 × 512 memory array with dual-decoder architecture, supporting asynchronous read/write cycles controlled by independent CE, OE, and WE signals. Its automatic power-down activates when CE is HIGH and all address/data inputs meet CMOS threshold conditions, reducing ICC to ≤0.5 µA typical.
Timing is defined by overlapping control signal windows: tRC = 70 ns (max), tACE = 70 ns (max), and tHZOE = 25 ns (max) under CL = 100 pF load. Input/output buffers are designed for direct interface with TTL logic families without external level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8 bits - supports byte-wide data bus without multiplexing or external latch |
| Access Time (tAA) | 70 ns max - guarantees deterministic read latency for real-time firmware execution |
| VCC Operating Range | 4.5 V to 5.5 V - compatible with standard 5 V logic rails and tolerates ±10% supply variation |
| Standby Current (ISB2) | 5 µA max at VCC = 5.5 V, TA = 85°C - enables battery-backed retention in low-power modes |
| Output Drive | IOH = –1.0 mA, IOL = 2.1 mA - meets TTL output loading requirements without pull-up resistors |
| Input Leakage | ±0.5 µA max - ensures reliable address/data sampling under high-impedance bus conditions |
| Capacitance (CIN/COUT) | 6 pF / 8 pF - minimizes signal integrity degradation on high-speed parallel buses |
Pinout & Package
Package: 28-lead narrow SOIC (450-mil width, 300-mil body), RoHS-compliant lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus enabling full 32K-word addressing without external decoding |
| I/O0–I/O7 | Bidirectional Data Bus | Three-state TTL-compatible lines shared for read and write; direction controlled by OE/WE |
| CE | Chip Enable (active LOW) | Primary chip-select signal; triggers automatic power-down when deasserted |
| OE | Output Enable (active LOW) | Enables data output drivers; HIGH places I/O pins in high-impedance state |
| WE | Write Enable (active LOW) | Controls write cycle initiation; LOW with CE LOW writes data, HIGH enables read |
| VCC | Power Supply | +5 V supply pin; decoupling required within 10 mm of pin per layout guidelines |
| GND | Ground Reference | Digital ground return; must be connected to system ground plane with low-inductance path |
Key Features
| Feature | Design Value |
|---|---|
| Automatic CE Power-down | Reduces standby current to ≤5 µA without external control logic or sleep mode software |
| TTL-Compatible I/O | Eliminates need for level translators when interfacing with 5 V microcontrollers and FPGAs |
| Three-State Output Drivers | Enables direct connection to shared data buses without contention or external bus transceivers |
| Industrial Temperature Range | Guaranteed operation from –40°C to +85°C without derating or thermal management overhead |
| Standard 28-Pin SOIC Footprint | Drop-in replacement for legacy SRAMs in existing PCB layouts with no redesign required |
Applications
| Industrial PLC Memory Buffer | Medical Instrument Data Cache |
|---|---|
|
Use Scenario: Stores real-time sensor acquisition buffers and configuration registers in programmable logic controllers operating in factory environments. IC Role / Device Role / Timing Role: Asynchronous byte-wide SRAM providing deterministic 70 ns read/write access for deterministic scan-cycle execution. Use Value: Low ISB2 (5 µA max) extends backup battery life during power-loss events without compromising cycle speed. |
Use Scenario: Holds waveform capture buffers and calibration coefficients in portable ECG monitors requiring stable memory retention. IC Role / Device Role / Timing Role: Non-volatile-retention-capable SRAM used with external battery backup for critical patient data preservation. Use Value: Guaranteed data retention at VCC ≥ 2.0 V enables seamless transition to backup power during main supply interruption. |
| Automotive Body Control Module | Test Equipment Firmware Stack |
|
Use Scenario: Implements volatile configuration storage and diagnostic log buffers in BCMs exposed to under-hood thermal cycling. IC Role / Device Role / Timing Role: Industrial-grade SRAM delivering consistent 70 ns access across –40°C to +85°C ambient range. Use Value: CMOS input thresholds and low leakage ensure reliable address sampling even with noisy 12 V system grounds. |
Use Scenario: Hosts firmware overlay code and runtime variable space in automated test equipment with tight timing budgets. IC Role / Device Role / Timing Role: High-speed parallel SRAM serving as instruction/data cache for ARM9-based controller subsystems. Use Value: tLZOE = 5 ns and tHZOE = 25 ns enable rapid bus turnaround for burst-mode instruction fetches. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar static RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IS62C256AL-70QLI | 70 ns access, same 32K × 8 organization, but 2.7–5.5 V VCC range and higher ISB2 (10 µA max) | Supports single-supply 3.3 V systems; less suitable for pure 5 V legacy designs with strict leakage budgets | Select if migrating to mixed-voltage platforms or requiring wider supply tolerance |
| AS6C4008-70ZIN | 70 ns access, identical 32K × 8, but only commercial temp range (0°C to +70°C) and higher ICC (55 mA max) | Limited to non-extended temperature environments; unsuitable for industrial or automotive deployments | Select only for cost-sensitive consumer-grade applications with no thermal stress requirements |
Compared with IS62C256AL-70QLI and AS6C4008-70ZIN, the CY62256LL-70ZC delivers lower standby current (5 µA vs. 10/- µA) and guaranteed industrial temperature support, making it optimal for battery-backed or thermally demanding embedded systems where power and reliability are co-constrained.
Availability
CY62256LL-70ZC is available at Aetrix Electronics and suitable for industrial PLC memory buffers, medical instrument data caches, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CY62256LL-70ZC 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 fabless semiconductor company specializing in memory, microcontrollers, and programmable logic solutions for industrial, automotive, and communications markets.
The CY62256 family was engineered for high-reliability, low-power asynchronous memory applications in legacy and upgrade paths for 5 V embedded systems, emphasizing pin compatibility, timing predictability, and thermal robustness.
FAQ
What is the maximum clock frequency supported by CY62256LL-70ZC?
The CY62256LL-70ZC is an asynchronous SRAM and does not use a clock signal. Its performance is defined by access time (tAA = 70 ns max) and cycle time (tRC = 70 ns max), allowing up to ~14.3 MHz effective throughput when interfaced with a controller capable of meeting setup/hold timing constraints.
Can CY62256LL-70ZC operate at 3.3 V?
No. The CY62256LL-70ZC requires 4.5 V to 5.5 V supply voltage and is not specified for 3.3 V operation. Attempting to power it at 3.3 V will result in undefined behavior, failed reads/writes, and potential data corruption due to insufficient noise margin and drive strength.
Does CY62256LL-70ZC support battery backup for data retention?
Yes. With VCC maintained ≥ 2.0 V and CE held HIGH, the device retains data with ICCDR ≤ 5 µA (typical) at 85°C. This enables integration with coin-cell or supercapacitor backup circuits for nonvolatile operation during main power loss.
Is the CY62256LL-70ZC pin-compatible with CY62256-70PC?
Yes. Both share identical 28-pin narrow SOIC pinout (ZC and PC suffixes denote different package types: ZC = lead-free SOIC, PC = plastic DIP), same address/data/control pin assignments, and fully compatible timing and electrical specifications for drop-in replacement in existing layouts.
CY62256LL-70ZC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- MOBL™
- Package/Case:
- 28-TSSOP (0.465", 11.80mm Width)
- Packaging:
- Bag
- 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-TSOP I
CY62256LL-70ZC FAQ
1.How can I place an order for CY62256LL-70ZC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY62256LL-70ZC 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-70ZC reliable?
The price and inventory of CY62256LL-70ZC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY62256LL-70ZC is usually 5 days.
3.What payment methods are accepted for CY62256LL-70ZC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY62256LL-70ZC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY62256LL-70ZC?
CY62256LL-70ZC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY62256LL-70ZC 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-70ZC?
For technical support, including CY62256LL-70ZC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY62256LL-70ZC requirements.
6.How does Aetrix verify that CY62256LL-70ZC is sourced from the original manufacturer or authorized distributors?
All CY62256LL-70ZC 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-70ZC meets industry standards.
7.What is the process for return or replacement of CY62256LL-70ZC?
All CY62256LL-70ZC units undergo pre-shipment inspection (PSI). If there is an issue with CY62256LL-70ZC, 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-70ZC part is unused and in its original packaging.
Return procedure for CY62256LL-70ZC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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