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Infineon Technologies CY62256L-70PC
- Part No.:
- CY62256L-70PC
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
CY62256L-70PC.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,432
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Product details
Overview
CY62256L-70PC 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 outputs for bus sharing in embedded microcontroller systems.
For engineers reviewing the CY62256L-70PC datasheet, CY62256L-70PC pinout, CY62256L-70PC application, or CY62256L-70PC equivalent, key selection criteria include its 70 ns read cycle time, low 28 µW standby current, 28-pin narrow SOIC package, and compatibility with legacy 8-bit data buses requiring deterministic timing and zero-refresh operation.
Technical Context
The CY62256L-70PC implements a full CMOS 32K × 8 SRAM array with dual-decode architecture (512 × 512), integrated sense amplifiers, and input/output buffers with TTL-level thresholds. Its CE/OE/WE control logic enables seamless memory expansion without external gating.
Power management relies on automatic CE-driven power-down mode, reducing ICC to ≤28 µW when CE is HIGH - independent of OE or WE state. All inputs meet VIH ≥ 2.2 V and VIL ≤ 0.8 V at VCC = 5 V, ensuring robust noise margin in mixed-signal environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32,768 × 8 bits) - supports byte-wide addressing without multiplexing or bank switching |
| Access Time | 70 ns max - guarantees deterministic read latency for real-time firmware execution |
| Voltage Range | 4.5 V to 5.5 V - compatible with standard 5 V TTL/CMOS logic rails and legacy power supplies |
| Standby Current | 28 µW max (at VCC = 5.5 V, TA = 85°C) - enables ultra-low-power sleep modes in battery-backed systems |
| Operating Temp | –40°C to +85°C - qualified for industrial control, motor drives, and factory automation environments |
| Package | 28-pin narrow SOIC (450-mil width) - surface-mount compatible with standard reflow profiles and IPC-7351 footprints |
| Output Drive | IOL = 2.1 mA / IOH = –1.0 mA - directly interfaces with 74LS/TTL loads without level-shifting or buffering |
Pinout & Package
Package: 28-pin narrow SOIC (450-mil body width, JEDEC MS-012AC), RoHS-compliant lead-free option available.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Input | 15-bit address bus accepting 0–32767 to select one of 32K memory locations |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit TTL-compatible data path; high-impedance when CE HIGH or OE HIGH during read/write |
| CE | Chip Enable (active LOW) | Primary device select; triggers automatic power-down when deasserted, reducing ICC to µW range |
| OE | Output Enable (active LOW) | Controls I/O direction: LOW enables output drivers; HIGH places pins in high-Z for bus arbitration |
| WE | Write Enable (active LOW) | Determines operation mode: LOW initiates write; HIGH enables read (with CE and OE active) |
| VCC | Power Supply | +4.5 V to +5.5 V supply input; decoupling required within 10 mm of Pin 28 per layout guidelines |
| GND | Ground Reference | Signal and power return plane connection; must be low-inductance and tied to system ground at single point |
Key Features
| Feature | Design Value |
|---|---|
| Automatic CE Power-down | Reduces standby current to ≤28 µW without external control logic or sleep-mode software overhead |
| TTL-Compatible I/O | Meets VIH ≥ 2.2 V and VOL ≤ 0.4 V at IOL = 2.1 mA - eliminates need for level translators in 5 V systems |
| Three-State Output Control | Independent OE and CE assertion enables multi-device bus sharing with no contention risk |
| Zero-Refresh Operation | Static RAM architecture requires no refresh cycles - simplifies timing-critical firmware and reduces CPU load |
| Industrial Temperature Qualification | Validated across –40°C to +85°C with full AC/DC specs - suitable for uncontrolled enclosure deployments |
Applications
| Industrial PLC Memory Buffer | Legacy Microcontroller Data RAM |
|---|---|
Use Scenario: Stores real-time I/O status, register values, and temporary process variables in programmable logic controllers with no DRAM controller. IC Role / Device Role / Timing Role: Byte-accessible, non-refreshing data RAM interfaced directly to 8-bit MCU address/data buses via CE/OE/WE handshaking. Use Value: Eliminates external refresh circuitry and guarantees 70 ns deterministic read/write response under all ambient conditions. |
Use Scenario: Serves as external program/data RAM for 8051, Z80, or 68000-based embedded systems where internal RAM is insufficient. IC Role / Device Role / Timing Role: Standalone parallel SRAM providing full 32K × 8 address space with synchronous CE/OE timing aligned to CPU bus cycles. Use Value: Enables firmware scalability without architectural changes - pin-compatible upgrade path from CY62256-70PC to CY62256L-70PC for lower power. |
| Automotive Body Control Module | Medical Instrument Data Cache |
Use Scenario: Holds configuration tables, calibration coefficients, and fault logs in automotive BCMs operating across –40°C to +125°C (derated). IC Role / Device Role / Timing Role: Industrial-grade SRAM supporting EEPROM offload and fast parameter lookup during CAN message processing. Use Value: 28 µW standby current extends backup battery life; 70 ns access ensures timely response to safety-critical interrupts. |
Use Scenario: Caches sensor acquisition buffers and waveform history in portable ECG or pulse oximeters with intermittent power. IC Role / Device Role / Timing Role: Low-leakage data store retaining critical patient data during brief power interruptions or sleep states. Use Value: Automatic CE power-down preserves data integrity while drawing <30 µW - enabling >72-hour battery runtime in standby. |
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 wide VCC range and higher ISB (100 µA typical) | Supports mixed-voltage systems (3.3 V/5 V), but lacks guaranteed industrial temp performance at 5 V | Select when voltage flexibility outweighs ultra-low standby power and industrial qualification |
| AS6C4008-70SCN | 70 ns access, 512K × 8 density, 4.5–5.5 V, but 100 µA ISB and only commercial temp (0°C to 70°C) | Higher density for future-proofing, but not qualified for industrial thermal cycling or long-term reliability at 85°C | Select only for cost-sensitive commercial designs where extended temperature range is unnecessary |
Compared with IS62C256AL-70QLI and AS6C4008-70SCN, the CY62256L-70PC delivers superior industrial reliability, lowest standby power (28 µW vs. ≥100 µW), and proven 85°C operation - making it optimal for mission-critical embedded systems where thermal stability and power predictability are non-negotiable.
Availability
CY62256L-70PC is available at Aetrix Electronics and suitable for industrial PLCs, legacy microcontroller upgrades, and automotive body control modules requiring stable component supply, long-lifecycle support, and guaranteed industrial temperature compliance.
Supply support for CY62256L-70PC 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, PSoC, and USB solutions for industrial, automotive, and consumer applications.
The CY62256 family was designed specifically for reliable, low-power, pin-compatible replacement of aging 256K SRAMs in 8-bit embedded systems - emphasizing timing determinism, industrial qualification, and drop-in board-level compatibility.
FAQ
Is CY62256L-70PC functionally identical to CY62256-70PC?
Yes - both share identical 32K × 8 organization, 70 ns access time, and pinout. The "L" suffix denotes the low-power industrial-grade variant with reduced standby current (28 µW vs. 5 mW for standard version) and extended temperature qualification (–40°C to +85°C).
Can CY62256L-70PC operate at 3.3 V?
No - it is specified only for 4.5 V to 5.5 V operation. Attempting 3.3 V supply violates absolute maximum ratings and will result in undefined behavior, data corruption, or failure to meet AC timing specifications.
What is the maximum clock frequency supported for bus interfacing?
This is an asynchronous SRAM - it has no clock input. Maximum interface speed is governed by tRC = 70 ns, permitting up to ~14.3 MHz sustained random access on an 8-bit bus with proper CE/OE setup/hold timing.
Does CY62256L-70PC require external pull-up resistors on I/O lines?
No - its outputs are actively driven (not open-drain), and inputs meet TTL thresholds without external biasing. Pull-ups are unnecessary unless used for specific bus arbitration schemes outside standard read/write protocols.
CY62256L-70PC 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-70PC FAQ
1.How can I place an order for CY62256L-70PC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY62256L-70PC 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-70PC reliable?
The price and inventory of CY62256L-70PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY62256L-70PC is usually 5 days.
3.What payment methods are accepted for CY62256L-70PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY62256L-70PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY62256L-70PC?
CY62256L-70PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY62256L-70PC 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-70PC?
For technical support, including CY62256L-70PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY62256L-70PC requirements.
6.How does Aetrix verify that CY62256L-70PC is sourced from the original manufacturer or authorized distributors?
All CY62256L-70PC 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-70PC meets industry standards.
7.What is the process for return or replacement of CY62256L-70PC?
All CY62256L-70PC units undergo pre-shipment inspection (PSI). If there is an issue with CY62256L-70PC, 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-70PC part is unused and in its original packaging.
Return procedure for CY62256L-70PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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