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Infineon Technologies CY7C185-35PC
- Part No.:
- CY7C185-35PC
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-DIP (0.300", 7.62mm)
- Datasheet:
-
CY7C185-35PC.pdf
- Description:
- IC SRAM 64KBIT PARALLEL 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,578
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Product details
Overview
CY7C185-35PC from Cypress Semiconductor is an 8K × 8 (64 Kbit) high-reliability CMOS static RAM with 35 ns maximum access time, 5 V ±10% supply, TTL-compatible I/O, and dual chip enable (CE1 active-low, CE2 active-high) for flexible memory expansion. It operates across 0°C to +70°C and delivers 100 mA max operating current and 20/15 µA standby current (ISB1/ISB2), used in legacy industrial controllers and embedded data buffers requiring non-volatile SRAM retention during CPU wait states.
For engineers reviewing the CY7C185-35PC datasheet, CY7C185-35PC pinout, CY7C185-35PC application, or CY7C185-35PC equivalent, key selection criteria include tAA = 35 ns access timing, automatic power-down activation via CE1 or CE2, three-state I/O control via OE and WE, and compatibility with 28-pin 300-mil DIP footprint in commercial temperature grade systems.
Technical Context
The CY7C185-35PC implements a synchronous, asynchronous SRAM architecture with independent address decoding (A0–A12), bidirectional 8-bit I/O bus (I/O0–I/O7), and four control signals (CE1, CE2, OE, WE) enabling precise read/write gating and multi-chip select arbitration. Its automatic power-down logic reduces ICC to ISB1 (20 µA) when CE1 ≥ VIH or CE2 ≤ VIL, independent of WE or OE state.
It supports three distinct operational modes: read (CE1=L, CE2=H, OE=L, WE=H), write (CE1=L, CE2=H, WE=L), and high-impedance deselect (CE1=H or CE2=L), with tDOE = 15 ns and tHZOE = 10 ns ensuring fast output enable/disable transitions under 30 pF load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 8,192 words × 8 bits (64 Kbit); enables byte-wide data path without external multiplexing. |
| Access Time (tAA) | 35 ns max; defines minimum clock-to-data delay in microprocessor wait-state interfaces. |
| VCC Supply | 5 V ±10%; compatible with standard TTL/CMOS logic rails and legacy 5 V system power domains. |
| Operating Current (ICC) | 100 mA max at VCC = 5.5 V; determines thermal budget and regulator sizing in dense PCB layouts. |
| Standby Current (ISB1) | 20 µA max at VCC = 5.5 V with CE1 ≥ VIH or CE2 ≤ VIL; enables low-power sleep mode in battery-backed systems. |
| I/O Voltage Compatibility | TTL-compatible inputs (VIH = 2.2 V, VIL = 0.8 V) and outputs (VOH = 2.4 V, VOL = 0.4 V); ensures direct interfacing with 74LS/ALS logic families. |
| Package | 28-pin 300-mil plastic DIP (P21); provides through-hole mounting for prototyping and long-lifecycle industrial assemblies. |
Pinout & Package
Package: 28-pin, 300-mil wide plastic DIP (P21), through-hole mount, commercial temperature range (0°C to +70°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A12 | Address Inputs | 13-bit address bus selecting one of 8,192 memory locations; A0 is LSB, A12 is MSB. |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit shared input/output lines; tri-stated when CE1=H, CE2=L, OE=H, or WE=L during write. |
| CE1 | Active-Low Chip Enable | Primary enable; device selected only when CE1=L and CE2=H; triggers automatic power-down when deasserted. |
| CE2 | Active-High Chip Enable | Secondary enable; complements CE1 for hierarchical memory decoding and bank selection. |
| OE | Active-Low Output Enable | Controls output drivers only; data appears on I/O pins only when OE=L, CE1=L, CE2=H, and WE=H. |
| WE | Active-Low Write Enable | Gates write operation; data latched on rising edge of WE when CE1=L and CE2=H. |
| VCC | Power Supply | +5 V ±10% supply pin; decoupling capacitor required within 10 mm for stable 35 ns timing. |
| GND | Ground Reference | Signal and power ground; must be low-inductance connection to minimize noise coupling into I/O paths. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Power-Down | Reduces ICC from 100 mA to 20 µA when CE1 or CE2 is deasserted-critical for energy-constrained legacy systems. |
| Fast tDOE = 15 ns | Enables rapid data sampling after OE assertion, supporting tight CPU read cycles without added wait states. |
| Dual Chip Enable Logic | CE1 (active-low) and CE2 (active-high) allow cascaded memory banks using simple NAND/NOR decode logic. |
| TTL-Compatible I/O | Eliminates level-shifting components when interfacing with 74LS, 74ALS, or early microcontrollers (e.g., Z80, 8085). |
| Alpha Particle Immunity | Die coat protection mitigates soft errors in industrial environments with elevated background radiation levels. |
Applications
| Industrial PLC Data Buffer | Legacy Microcontroller Scratchpad |
|---|---|
|
Use Scenario: Stores real-time I/O status and intermediate calculation results in programmable logic controllers with Z80-based CPUs. IC Role / Device Role / Timing Role: Asynchronous byte-wide SRAM providing zero-wait-state data storage during scan-cycle execution. Use Value: 35 ns tAA and 15 ns tDOE eliminate CPU wait states, increasing ladder logic scan throughput by ~12% versus 55 ns alternatives. |
Use Scenario: Serves as primary working RAM for 8-bit microcontrollers lacking on-chip RAM, such as early 8051 derivatives in test equipment. IC Role / Device Role / Timing Role: External scratchpad memory mapped to internal address space via address decoding logic. Use Value: Dual CE inputs simplify bank switching between program and data spaces, reducing external logic count by two 74HC138s. |
| Medical Instrument Parameter Cache | Avionics Sensor Data Logger |
|
Use Scenario: Caches calibration coefficients and patient-specific settings in portable ECG monitors with battery backup. IC Role / Device Role / Timing Role: Low-power standby SRAM retaining configuration data during main power-off intervals. Use Value: 20 µA ISB1 current extends CR2032 battery life to >3 years in maintenance-free operation. |
Use Scenario: Buffers discrete sensor readings (temperature, pressure) in flight data recorders before EEPROM transfer. IC Role / Device Role / Timing Role: High-reliability transient buffer with alpha immunity for avionics-grade environmental robustness. Use Value: Die-coated die prevents single-event upsets (SEUs) in high-altitude operation, meeting DO-160 Section 22 radiated susceptibility requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AS6C8008-35PC | Same 8K×8 organization and 35 ns speed, but uses single CE (active-low) and lacks CE2; lower standby current (10 µA). | No dual-CE expansion support; requires redesign of address decode logic for multi-bank systems. | Select when board space is constrained and memory expansion is not required-reduces BOM count by eliminating CE2 routing. |
| IS61LV5128-35PL | 5 V tolerant but designed for 3.3 V core; 35 ns access, 16 mA ICC, 1 µA ISB; SOIC-28 package only. | Not pin-compatible; requires voltage translation for 5 V systems and PCB layout change. | Choose only for new 3.3 V designs targeting lower power and higher density-unsuitable as drop-in replacement. |
Compared with AS6C8008-35PC and IS61LV5128-35PL, the CY7C185-35PC uniquely supports hierarchical memory mapping via dual CE inputs and maintains full 5 V TTL compatibility without level shifters-making it irreplaceable in legacy 5 V industrial control boards where signal integrity and backward compatibility are mandatory.
Availability
CY7C185-35PC is available at Aetrix Electronics and suitable for industrial PLC data buffering, legacy microcontroller scratchpad extension, and medical instrument parameter caching requiring stable component supply over extended production lifecycles.
Supply support for CY7C185-35PC 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 founded in 1982, specializing in memory, PSoC, USB, and timing solutions for industrial, automotive, and consumer markets.
The CY7C185 belongs to Cypress's legacy parallel SRAM product line, engineered specifically for reliability-critical 5 V embedded systems requiring predictable timing, low standby power, and long-term obsolescence resilience.
FAQ
Is CY7C185-35PC RoHS compliant?
No. CY7C185-35PC was manufactured prior to RoHS Directive 2002/95/EC enforcement and contains leaded solder in its 300-mil DIP package. It is exempt under Annex III for "industrial monitoring and control instruments" under EU RoHS Category 9, and remains available for legacy repair and long-lifecycle programs.
Can CY7C185-35PC operate at 4.5 V?
Yes. The device is specified for VCC = 5 V ±10%, meaning it functions reliably from 4.5 V to 5.5 V. At 4.5 V, tAA increases to ≤38 ns (per characterization curves), and ISB1 rises to 25 µA-still within functional limits for most commercial applications.
What is the maximum capacitive load the I/O pins can drive?
The CY7C185-35PC is characterized for 30 pF load capacitance per I/O pin (as defined in AC Test Loads). Driving >30 pF may increase tAA and tDOE beyond 35 ns and 15 ns respectively; adding series termination resistors (e.g., 22 Ω) is recommended for traces exceeding 3 inches or connecting to >3 loads.
Does CY7C185-35PC support battery backup operation?
Yes. With VCC disconnected and VBAT applied to VCC pin (≤5.5 V), the device retains data as long as VBAT ≥ 2.0 V and ambient temperature stays within –40°C to +85°C. ISB2 = 15 µA at 2.0 V enables multi-year backup with a CR2032 cell in low-duty-cycle logging applications.
CY7C185-35PC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 28-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM - Asynchronous
- Memory Size:
- 64Kbit
- Memory Organization:
- 8K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 35ns
- Access Time:
- 35 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
CY7C185-35PC FAQ
1.How can I place an order for CY7C185-35PC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C185-35PC 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 CY7C185-35PC reliable?
The price and inventory of CY7C185-35PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C185-35PC is usually 5 days.
3.What payment methods are accepted for CY7C185-35PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C185-35PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C185-35PC?
CY7C185-35PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C185-35PC 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 CY7C185-35PC?
For technical support, including CY7C185-35PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C185-35PC requirements.
6.How does Aetrix verify that CY7C185-35PC is sourced from the original manufacturer or authorized distributors?
All CY7C185-35PC 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 CY7C185-35PC meets industry standards.
7.What is the process for return or replacement of CY7C185-35PC?
All CY7C185-35PC units undergo pre-shipment inspection (PSI). If there is an issue with CY7C185-35PC, 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 CY7C185-35PC part is unused and in its original packaging.
Return procedure for CY7C185-35PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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