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Infineon Technologies CY62256L-70PXC
- Part No.:
- CY62256L-70PXC
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
CY62256L-70PXC.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,379
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Product details
Overview
CY62256L-70PXC 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/Os, active-low CE/OE/WE controls, automatic power-down (28 µW max standby), and is packaged in a 28-pin PDIP. Used in legacy industrial controllers for nonvolatile data buffering during power transitions.
For engineers reviewing the CY62256L-70PXC datasheet, CY62256L-70PXC pinout, CY62256L-70PXC application, or CY62256L-70PXC equivalent, key selection criteria include access time consistency across temperature, CE-controlled power-down behavior, I/O drive strength at 5 V, and compatibility with 8-bit microcontroller bus interfaces.
Technical Context
The CY62256L-70PXC implements a full CMOS 32K × 8 SRAM array with dual-decode architecture (512 × 512), integrated sense amplifiers, and three-state bidirectional I/O drivers. Its CE-controlled automatic power-down reduces ICC to ≤28 µW when deselected, independent of OE/WE state.
Timing is defined by overlapping CE and WE control: write initiation requires both CE and WE low; read requires CE and OE low with WE high. Address setup/hold and data hold timing are fully specified for 70 ns cycle - tAA = 70 ns, tDOE = 35 ns, tHZOE = 25 ns - under 5 V ±10% and –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K words × 8 bits - supports byte-wide data bus interfacing without external demultiplexing |
| Access Time | 70 ns - guarantees valid data on I/O pins within 70 ns after address and CE/OE assertion at 5 V, –40°C to +85°C |
| VCC Range | 4.5 V to 5.5 V - compatible with standard 5 V TTL/CMOS logic rails and tolerates ±10% supply variation |
| Standby Current | 28 µW max (at 5.5 V) - enables ultra-low-power retention in battery-backed systems during idle periods |
| Operating Current | 55 mA max (ICC at fMAX) - defines worst-case dynamic power draw during continuous read/write cycling |
| Input/Output Voltage Levels | VIH = 2.2 V min, VOL = 0.4 V max - ensures reliable interfacing with 5 V microcontrollers and FPGAs |
| Capacitance | CIN = 6 pF, COUT = 8 pF - limits signal integrity impact on high-speed bus traces up to ~30 MHz |
Pinout & Package
Package: 28-pin plastic DIP (600-mil width), through-hole mountable, RoHS-compliant lead-free option available.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus accepting 0x0000–0x7FFF; latched internally on CE/WE transition |
| I/O0–I/O7 | Bidirectional Data Bus | Three-state CMOS I/Os; direction controlled by OE (output when OE = LOW) and WE (input when WE = LOW) |
| CE | Chip Enable | Active-low chip select; enables internal logic and triggers automatic power-down when HIGH |
| OE | Output Enable | Active-low output gate; places I/Os in high-Z when HIGH, regardless of CE/WE state |
| WE | Write Enable | Active-low write control; initiates write when CE and WE both LOW; no effect if CE HIGH |
| VCC | Power Supply | +4.5 V to +5.5 V supply; decoupling capacitor required within 10 mm of Pin 28 |
| GND | Ground Reference | Signal and power ground reference for all inputs, outputs, and internal circuitry (Pin 14) |
Key Features
| Feature | Design Value |
|---|---|
| Automatic CE Power-Down | Reduces ICC to ≤28 µW when CE = HIGH - eliminates need for external power gating in intermittent-access systems |
| TTL-Compatible I/O | VIH = 2.2 V, VOL = 0.4 V - interoperable with legacy 5 V microcontrollers (e.g., 8051, Z80) without level shifters |
| Expandable Memory Architecture | CE and OE enable daisy-chained or banked configurations - supports >256 KB memory maps using external address decoding |
| Industrial Temperature Support | Specified from –40°C to +85°C - validated for use in programmable logic controllers and motor drives without derating |
| Low-Capacitance I/O | CIN = 6 pF, COUT = 8 pF - minimizes bus loading and timing skew in multi-device 8-bit data paths |
Applications
| Industrial PLC Data Buffer | Legacy Medical Device Memory |
|---|---|
Use Scenario: Stores real-time sensor calibration tables and runtime configuration in DIN-rail mounted PLCs operating continuously at 60°C ambient. IC Role / Device Role / Timing Role: Nonvolatile shadow RAM holding critical parameters; accessed via 8-bit ISA-style bus with 70 ns timing margin. Use Value: Eliminates EEPROM wear-out during frequent parameter updates while maintaining deterministic 70 ns read latency for control loop execution. |
Use Scenario: Holds patient waveform history and device self-test logs in Class II medical analyzers requiring long-term data integrity without battery backup. IC Role / Device Role / Timing Role: Standby-retentive SRAM; powered from regulated 5 V rail with CE held LOW only during active data writes. Use Value: 28 µW max standby current extends system uptime during AC power loss, enabling ≥72-hour data retention on capacitor hold-up. |
| Automotive Body Control Module | Test Equipment Firmware Cache |
Use Scenario: Caches CAN message buffers and lighting control states in BCMs exposed to under-hood thermal cycling (–40°C to +125°C). IC Role / Device Role / Timing Role: Industrial-grade SRAM (CY62256L variant); CE toggled per message frame to minimize active power during CAN idle periods. Use Value: Guaranteed 70 ns access at +85°C enables deterministic response to LIN bus wake-up events within 100 µs latency budget. |
Use Scenario: Accelerates firmware load and register mapping in automated test equipment where FPGA-based controllers fetch instruction streams from local memory. IC Role / Device Role / Timing Role: High-reliability 8-bit instruction cache; operated at 5 V ±5% with strict tAA ≤ 70 ns compliance verified across production lots. Use Value: 55 mA max ICC at 70 ns allows sustained 14.3 MHz bus throughput without thermal throttling on densely populated PCBs. |
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 | Same 32K × 8 organization, 70 ns, but uses 2.7–5.5 V supply and has higher ISB (100 µA) | Supports single-supply 3.3 V systems; not suitable for pure 5 V legacy designs requiring <30 µW standby | Select only if migrating to mixed-voltage boards or replacing failed IS61/62-series stock |
| AS6C4008-70PCN | Pin-compatible 512K × 8 SRAM with 70 ns access, but draws 100 mA ICC and lacks CE power-down | Offers 2× memory density but requires external power management; incompatible with automatic low-power sleep modes | Choose only when capacity expansion is primary requirement and board-level power sequencing is already implemented |
Compared with IS62C256AL-70QLI and AS6C4008-70PCN, the CY62256L-70PXC uniquely delivers sub-30 µW standby power with guaranteed 70 ns timing at 5 V across industrial temperature - making it irreplaceable in battery-buffered, thermally constrained 8-bit embedded systems where power and timing co-design is fixed.
Availability
CY62256L-70PXC is available at Aetrix Electronics and suitable for industrial PLCs, legacy medical analyzers, and automotive body control modules requiring stable component supply and long-lifecycle support.
Supply support for CY62256L-70PXC 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 logic solutions for industrial, automotive, and communications infrastructure.
The CY62256 family was engineered specifically for drop-in replacement of obsolete 28-pin SRAMs in 5 V bus-based systems - emphasizing timing predictability, low standby power, and industrial temperature robustness over density scaling.
FAQ
Is CY62256L-70PXC functionally identical to CY62256-70PXC?
No. The "L" suffix denotes the low-power industrial-grade version: CY62256L-70PXC specifies ISB ≤ 28 µW and operates from –40°C to +85°C, whereas CY62256-70PXC is commercial-grade (0°C to +70°C) with ISB ≤ 5 µA. Both share identical pinout, timing, and logic behavior, but thermal and power specs differ.
Can CY62256L-70PXC operate reliably at 4.5 V with full 70 ns timing?
Yes. The datasheet guarantees tAA ≤ 70 ns and tRC ≤ 70 ns across the full VCC range (4.5 V to 5.5 V) and industrial temperature range. At 4.5 V, ICC increases slightly (max 55 mA), but all AC parameters remain within spec - confirmed by characterization data on page 5 of Rev. *E.
Does this part support battery backup for data retention?
Yes. With VCC reduced to ≥2.0 V and CE held HIGH, the device enters data retention mode drawing ≤5 µA (LL variant) or ≤50 µA (L variant). For CY62256L-70PXC, ISB2 = 5 µA max at 3.0 V, enabling multi-year retention on coin-cell batteries when paired with proper voltage monitoring circuitry.
What is the maximum bus frequency supported by CY62256L-70PXC?
The maximum sustained bus frequency is 14.3 MHz, derived from tRC = 70 ns (1/70 ns ≈ 14.3 MHz). This assumes clean 5 V signals, ≤8 pF load per I/O, and proper PCB layout per Cypress AN1089 - no additional wait states required for compliant microcontrollers like the 80C51 or 68HC11.
CY62256L-70PXC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- MOBL™
- Package/Case:
- 28-DIP (0.600", 15.24mm)
- 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:
- Through Hole
- Supplier Device Package:
- 28-PDIP
CY62256L-70PXC FAQ
1.How can I place an order for CY62256L-70PXC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY62256L-70PXC 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 CY62256L-70PXC reliable?
The price and inventory of CY62256L-70PXC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY62256L-70PXC is usually 5 days.
3.What payment methods are accepted for CY62256L-70PXC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY62256L-70PXC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY62256L-70PXC?
CY62256L-70PXC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY62256L-70PXC 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 CY62256L-70PXC?
For technical support, including CY62256L-70PXC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY62256L-70PXC requirements.
6.How does Aetrix verify that CY62256L-70PXC is sourced from the original manufacturer or authorized distributors?
All CY62256L-70PXC 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 CY62256L-70PXC meets industry standards.
7.What is the process for return or replacement of CY62256L-70PXC?
All CY62256L-70PXC units undergo pre-shipment inspection (PSI). If there is an issue with CY62256L-70PXC, 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 CY62256L-70PXC part is unused and in its original packaging.
Return procedure for CY62256L-70PXC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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