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Infineon Technologies CY62256NLL-55ZXAT
- Part No.:
- CY62256NLL-55ZXAT
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
CY62256NLL-55ZXAT.pdf
- Description:
- IC SRAM 256KBIT PAR 28TSOP I
- Quantity:
- Payment:
- Shipping:
Inventory:1,837
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Product details
Overview
CY62256NLL-55ZXAT from Infineon Technologies (formerly Cypress) is a 256-Kbit (32 K × 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, and low standby current (≤10 µA), used in embedded controllers, industrial PLCs, and legacy instrumentation requiring non-volatile SRAM backup.
For engineers reviewing the CY62256NLL-55ZXAT datasheet, CY62256NLL-55ZXAT pinout, CY62256NLL-55ZXAT application, or CY62256NLL-55ZXAT equivalent, key selection criteria include 55 ns read cycle time, 32K × 8 organization, CE/OE/WE control logic, and TSOP I package compatibility for space-constrained PCB layouts.
Technical Context
The CY62256NLL-55ZXAT implements a fully static 32K × 8 memory array with asynchronous parallel interface. Its dual-level power management includes active-mode ICC ≤50 mA and standby ISB2 ≤10 µA under CMOS input conditions, enabled by automatic CE-driven power-down.
Timing is governed by strict AC parameters: tRC = 55 ns, tAA = 55 ns, tDOE = 25 ns, and tPD = 55 ns. The device uses tristate bidirectional I/O0–I/O7 pins controlled jointly by OE (output enable) and WE (write enable), with address decoding across A0–A14 (15-bit addressing).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32 K × 8) - supports byte-wide data bus without external multiplexing |
| Access Time | 55 ns - enables direct interfacing with 12–15 MHz microcontrollers without wait states |
| VCC Range | 4.5 V to 5.5 V - compatible with standard 5 V TTL/CMOS logic rails and legacy power supplies |
| Standby Current | ≤10 µA at VCC = 5.5 V, TA = 85 °C - extends battery life in always-on industrial monitoring systems |
| Operating Temp | –40 °C to +85 °C - qualified for industrial automation and transportation control environments |
| Package | 28-pin TSOP I (Z suffix) - surface-mount footprint with 0.55 mm pitch, optimized for high-density PCBs |
| Input Compatibility | TTL/CMOS - accepts 0.8 V / 2.2 V logic thresholds, eliminating level-shifter requirements |
Pinout & Package
Package: 28-pin TSOP I (Type I, 8.1 mm × 13.4 mm body, 0.55 mm pitch), RoHS-compliant, lead-free (X suffix).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Input | 15-bit unidirectional address bus; selects one of 32,768 memory locations |
| I/O0–I/O7 | Bidirectional Data Bus | Tristate I/O lines shared for read/write; direction controlled by OE and WE states |
| CE | Chip Enable (active LOW) | Primary chip select; asserts internal circuitry and enables automatic power-down when HIGH |
| OE | Output Enable (active LOW) | Enables output drivers during READ; places I/O pins in high-Z state when HIGH |
| WE | Write Enable (active LOW) | Controls data flow direction: LOW = write to memory, HIGH = read from memory |
| VCC | Power Supply | +4.5 V to +5.5 V supply rail; decoupling required within 10 mm of pin 28 |
| GND | Ground Reference | Signal and power ground reference for all inputs, outputs, and internal logic |
Key Features
| Feature | Design Value |
|---|---|
| Automatic CE Power-Down | Reduces standby current to ≤10 µA without external control logic or sleep mode firmware |
| 55 ns Read Cycle (tRC) | Supports real-time data logging in motion control systems with ≤8.2 MB/s burst throughput |
| TTL-Compatible I/O | Eliminates level translation between 5 V microcontrollers (e.g., 8051, PIC18F) and memory interface |
| CMOS Core Architecture | Delivers 275 mW max active power at 55 ns speed-optimal balance of latency and thermal dissipation |
| Multiple Temperature Grades | Industrial-grade qualification (–40 °C to +85 °C) ensures reliability in factory-floor PLC modules |
Applications
| Industrial PLC Data Buffer | Legacy Medical Instrument Memory |
|---|---|
|
Use Scenario: Stores real-time sensor readings and control setpoints in programmable logic controllers during cyclic scan execution. IC Role / Device Role / Timing Role: Asynchronous parallel SRAM providing zero-wait-state data storage for deterministic 10 ms scan cycles. Use Value: 55 ns access time ensures full 32 KB buffer read/write completion within single CPU instruction cycle on 12 MHz 8051 derivatives. |
Use Scenario: Holds calibration coefficients and patient waveform history in portable ECG analyzers with battery backup. IC Role / Device Role / Timing Role: Low-power static RAM retaining critical data during main power loss, enabled by ≤10 µA ISB2. Use Value: Automatic CE power-down eliminates need for external power-fail detection circuitry, reducing BOM count by two components. |
| Automotive Engine Control Module | Test & Measurement Equipment Cache |
|
Use Scenario: Caches transient engine parameter logs (RPM, throttle, O2) in Tier-1 ECU designs operating across –40 °C to +85 °C. IC Role / Device Role / Timing Role: Industrial-grade SRAM serving as volatile scratchpad memory for diagnostic data capture before flash write. Use Value: Qualified automotive-A temperature range ensures functional stability during under-hood thermal cycling without derating. |
Use Scenario: Buffers high-speed analog-to-digital sample streams in digital oscilloscopes and spectrum analyzers. IC Role / Device Role / Timing Role: Byte-wide parallel memory acting as first-stage acquisition buffer prior to FPGA-based decimation. Use Value: Tristate I/O0–I/O7 with 25 ns tDOE enables seamless handoff to 100 MHz FPGA data buses without glue logic. |
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 2.7–5.5 V VCC range and 32-pin SOJ package | Requires voltage translation for strict 5 V systems; larger footprint limits high-density layouts | Select if dual-voltage support or existing SOJ socket compatibility is required |
| AS6C4008-55PCN | 55 ns access, 5 V only, but 28-pin SOIC package and higher ICC (≤70 mA) in active mode | Lacks industrial temp grade (only commercial 0–70 °C); unsuitable for extended ambient operation | Choose only for cost-sensitive commercial equipment where thermal margin exceeds 15 °C |
Compared with IS62C256AL-55QLI and AS6C4008-55PCN, the CY62256NLL-55ZXAT uniquely combines industrial temperature rating, TSOP I packaging, and sub-10 µA standby current-making it optimal for thermally constrained, battery-backed industrial edge nodes.
Availability
CY62256NLL-55ZXAT is available at Aetrix Electronics and suitable for industrial PLCs, automotive engine control modules, and portable medical instruments requiring stable component supply across extended product lifecycles.
Supply support for CY62256NLL-55ZXAT 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
Infineon Technologies acquired Cypress Semiconductor in 2020 and maintains its broad portfolio of legacy memory, microcontroller, and analog products with full technical and supply chain continuity.
The CY62256N series belongs to Cypress' parallel SRAM product line, designed specifically for drop-in replacement of aging NMOS and early CMOS SRAMs in industrial and automotive control systems requiring long-term availability and proven reliability.
FAQ
Is CY62256NLL-55ZXAT pin-compatible with CY62256NLL-70ZXAT?
Yes-both share identical 28-pin TSOP I pinout, address/data/control signal mapping, and DC electrical characteristics. The only difference is guaranteed maximum access time: 55 ns vs. 70 ns. Systems designed for 55 ns timing will operate reliably with the -70 variant, but not vice versa in timing-critical paths.
Does CY62256NLL-55ZXAT require an external clock signal?
No-it is a fully asynchronous static RAM with no clock input. All operations are controlled by edge- and level-sensitive signals: CE (chip enable), OE (output enable), and WE (write enable). Timing is defined solely by setup/hold relationships between these control lines and address/data transitions.
Can CY62256NLL-55ZXAT retain data during VCC brownout?
Yes-data retention is guaranteed down to VCC = 2.0 V with ≤5 µA current draw (typical 0.1 µA). When CE is held HIGH during undervoltage, the device enters automatic power-down mode and preserves stored bits until VCC recovers above 2.0 V, provided duration stays within data retention time limits.
What is the maximum sustained data throughput achievable with CY62256NLL-55ZXAT?
At 55 ns cycle time, the theoretical peak throughput is 18.2 MB/s for sequential reads/writes. Real-world sustained throughput depends on bus arbitration and controller overhead, but verified implementations achieve ≥14 MB/s using 8051 or ARM7-based controllers with optimized burst-read firmware and proper PCB layout (controlled impedance, <10 mm trace length).
CY62256NLL-55ZXAT 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
CY62256NLL-55ZXAT FAQ
1.How can I place an order for CY62256NLL-55ZXAT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY62256NLL-55ZXAT 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 CY62256NLL-55ZXAT reliable?
The price and inventory of CY62256NLL-55ZXAT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY62256NLL-55ZXAT is usually 5 days.
3.What payment methods are accepted for CY62256NLL-55ZXAT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY62256NLL-55ZXAT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY62256NLL-55ZXAT?
CY62256NLL-55ZXAT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY62256NLL-55ZXAT 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 CY62256NLL-55ZXAT?
For technical support, including CY62256NLL-55ZXAT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY62256NLL-55ZXAT requirements.
6.How does Aetrix verify that CY62256NLL-55ZXAT is sourced from the original manufacturer or authorized distributors?
All CY62256NLL-55ZXAT 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 CY62256NLL-55ZXAT meets industry standards.
7.What is the process for return or replacement of CY62256NLL-55ZXAT?
All CY62256NLL-55ZXAT units undergo pre-shipment inspection (PSI). If there is an issue with CY62256NLL-55ZXAT, 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 CY62256NLL-55ZXAT part is unused and in its original packaging.
Return procedure for CY62256NLL-55ZXAT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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