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Infineon Technologies CY7C185-35SC
- Part No.:
- CY7C185-35SC
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-BSOJ (0.300", 7.62mm Width)
- Datasheet:
-
CY7C185-35SC.pdf
- Description:
- IC SRAM 64KBIT PARALLEL 28SOJ
- Quantity:
- Payment:
- Shipping:
Inventory:3,430
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Product details
Overview
CY7C185-35SC 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 commercial temperature range (0°C to +70°C) and supports automatic power-down when deselected, reducing standby current to 20 µA.
For engineers reviewing the CY7C185-35SC datasheet, CY7C185-35SC pinout, CY7C185-35SC application, or CY7C185-35SC equivalent, key selection criteria include tAA = 35 ns read timing, ISB1 = 20 mA standby current under CE1/CE2 control, CE1/CE2/OE logic compatibility in multi-chip systems, and SOIC-28 package suitability for space-constrained PCB layouts.
Technical Context
The CY7C185-35SC implements a fully static 8192 × 8-bit memory array with three-state bidirectional I/Os controlled by independent CE1, CE2, and OE signals. Its dual-enable architecture allows hierarchical memory mapping-CE1 enables local selection while CE2 permits global bank enable in larger systems.
Write operation requires simultaneous CE1 = LOW, CE2 = HIGH, and WE = LOW; read requires CE1 = LOW, CE2 = HIGH, OE = LOW, and WE = HIGH. Output high-impedance state is guaranteed when any of CE1, CE2, or OE is inactive, eliminating bus contention without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 8K × 8 (65,536 bits), fully random-access with no refresh required |
| Access Time (tAA) | 35 ns max - defines minimum clock-to-data delay in synchronous read cycles |
| Supply Voltage | 5 V ±10% - compatible with legacy 5 V TTL/CMOS system rails |
| Standby Current (ISB1) | 20 mA max - achieved when CE1 ≥ VIH or CE2 ≤ VIL, enabling low-power deselection |
| Output Enable Delay (tDOE) | 15 ns max - determines minimum OE assertion-to-valid-data latency during reads |
| Package | 28-pin SOIC (S21), 300-mil width - surface-mount compatible with standard reflow profiles |
| Operating Temperature | 0°C to +70°C - validated for commercial-grade embedded control and instrumentation |
Pinout & Package
28-pin Small Outline Integrated Circuit (SOIC) package, 300-mil body width, gull-wing leads, RoHS-compliant finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A12 | Address Inputs | 13-bit address bus selecting one of 8192 memory locations |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit shared input/output lines with three-state control via CE/OE/WE |
| CE1 | Chip Enable 1 (active-low) | Primary selection signal; asserts internal circuitry and disables power-down |
| CE2 | Chip Enable 2 (active-high) | Secondary enable for hierarchical decoding; must be HIGH to activate device |
| OE | Output Enable (active-low) | Controls output drivers only; does not affect internal memory state or power mode |
| WE | Write Enable (active-low) | Directly gates write operation; LOW with CE1/CE2 asserted initiates data latch |
| VCC | Power Supply | +5 V supply pin; decoupling capacitor placement critical for tAA stability |
| GND | Ground Reference | Signal and power return path; separate analog/digital grounding not required |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Power-Down | Reduces ICC to ISB1 = 20 mA when CE1 or CE2 deasserted - eliminates need for external power gating |
| Dual Chip Enable Logic | CE1 (active-low) + CE2 (active-high) enables 2-level decode for 16-MB+ memory maps without glue logic |
| TTL-Compatible I/O | VIH = 2.2 V min, VOL = 0.4 V max at 8 mA - interoperable with 74LS, 74F, and microcontroller GPIOs |
| Fast tDOE = 15 ns | Minimizes OE-controlled read latency in burst-mode or polled I/O interfaces |
| Alpha Particle Immunity | Die coat protection ensures <10−12 soft error rate - suitable for industrial control environments |
Applications
| Industrial PLC Data Buffer | Legacy Microcontroller Code Storage |
|---|---|
|
Use Scenario: Storing real-time sensor history and configuration registers in programmable logic controllers with 8051- or Z80-based CPU subsystems. IC Role / Device Role / Timing Role: Non-refreshing data buffer interfacing directly to 8-bit multiplexed address/data buses with CE2 used for rack-level enable. Use Value: 35 ns tAA and 15 ns tDOE support deterministic scan-cycle timing under 100 kHz I/O polling without wait states. |
Use Scenario: Holding boot code and interrupt vectors for 8-bit microcontrollers lacking on-chip ROM, such as early 80C51 derivatives. IC Role / Device Role / Timing Role: Memory-mapped instruction/data storage mapped to fixed 0x0000–0x1FFF address space with CE1 tied to A15. Use Value: Dual CE architecture allows seamless integration into existing 8-bit bus timing with no additional address decoder ICs. |
| Medical Instrument Parameter Cache | Communications Protocol Stack Buffer |
|
Use Scenario: Caching calibration coefficients and patient-specific settings in portable ECG monitors requiring zero-refresh volatility during battery operation. IC Role / Device Role / Timing Role: Low-power SRAM holding persistent parameters accessed infrequently but requiring sub-µs read latency on demand. Use Value: ISB1 = 20 mA standby current extends battery life between measurements while maintaining instant data availability. |
Use Scenario: Temporary packet buffering in RS-485 fieldbus gateways handling Modbus RTU frames with variable payload length. IC Role / Device Role / Timing Role: Shared I/O buffer supporting full-duplex framing where WE toggles per byte and OE synchronizes to UART TX/RX strobes. Use Value: Three-state I/O and precise tHZOE = 10 ns ensure clean bus release between transmit/receive phases without contention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8K×8 SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AS6C8008-35PC | 35 ns access, same 8K×8 organization, but uses single active-low CE and lacks CE2; ISB = 30 µA | Requires redesign of CE decoding logic; no hierarchical enable capability | Select if board layout already uses single-CE topology and lower standby current is not critical |
| IS61LV25616AL-10TLI | 256K×16 organization, 10 ns access, 3.3 V supply - incompatible voltage and density | Not drop-in; requires bus width expansion and level-shifting | Choose only for new designs targeting higher bandwidth and lower voltage, not for CY7C185-35SC replacement |
Compared with AS6C8008-35PC and IS61LV25616AL-10TLI, the CY7C185-35SC uniquely supports dual-enable memory expansion and maintains strict 5 V TTL compatibility-critical for legacy system upgrades where bus loading and timing margins are constrained.
Availability
CY7C185-35SC is available at Aetrix Electronics and suitable for industrial PLC data buffering, legacy microcontroller code storage, and medical instrument parameter caching requiring stable component supply across extended product lifecycles.
Supply support for CY7C185-35SC 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 and embedded markets.
The CY7C185 belongs to Cypress's legacy parallel SRAM product line, designed specifically for pin-compatible replacement of bipolar and early CMOS SRAMs in 5 V systems requiring reliability, predictable timing, and minimal design change.
FAQ
Is CY7C185-35SC compatible with 5 V TTL logic families?
Yes. The CY7C185-35SC features TTL-compatible inputs (VIH = 2.2 V min, VIL = 0.8 V max) and outputs (VOH = 2.4 V min at –4 mA, VOL = 0.4 V max at 8 mA), ensuring direct interface with 74LS, 74F, and 8051-family microcontrollers without level shifters.
What happens to data retention when CE1 and CE2 are both inactive?
Data is retained indefinitely as long as VCC remains within specification (4.5–5.5 V) and ambient temperature stays within 0°C to +70°C. The device enters automatic power-down mode with ISB1 = 20 mA, but the SRAM cell state remains stable-no data loss occurs during deselection.
Can CY7C185-35SC operate with CE2 permanently tied HIGH?
Yes. CE2 may be hardwired HIGH (e.g., to VCC via 1 kΩ pull-up) to simplify decoding, converting the device to single-enable operation. In this configuration, CE1 alone controls selection, and all timing parameters remain valid per datasheet specifications.
Does CY7C185-35SC require external pull-up resistors on I/O lines?
No. The I/O pins are internally three-stated when deselected (CE1 HIGH or CE2 LOW) or when OE is HIGH. Pull-ups are unnecessary unless system-level bus arbitration or open-drain emulation is required-standard use cases rely on controlled driver enablement only.
CY7C185-35SC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 28-BSOJ (0.300", 7.62mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
- 28-SOJ
CY7C185-35SC FAQ
1.How can I place an order for CY7C185-35SC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C185-35SC 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 CY7C185-35SC reliable?
The price and inventory of CY7C185-35SC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C185-35SC is usually 5 days.
3.What payment methods are accepted for CY7C185-35SC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C185-35SC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C185-35SC?
CY7C185-35SC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C185-35SC 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 CY7C185-35SC?
For technical support, including CY7C185-35SC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C185-35SC requirements.
6.How does Aetrix verify that CY7C185-35SC is sourced from the original manufacturer or authorized distributors?
All CY7C185-35SC 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 CY7C185-35SC meets industry standards.
7.What is the process for return or replacement of CY7C185-35SC?
All CY7C185-35SC units undergo pre-shipment inspection (PSI). If there is an issue with CY7C185-35SC, 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 CY7C185-35SC part is unused and in its original packaging.
Return procedure for CY7C185-35SC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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