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Infineon Technologies CY7C185-35VC
- Part No.:
- CY7C185-35VC
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-BSOJ (0.300", 7.62mm Width)
- Datasheet:
-
CY7C185-35VC.pdf
- Description:
- IC SRAM 64KBIT PARALLEL 28SOJ
- Quantity:
- Payment:
- Shipping:
Inventory:1,822
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Product details
Overview
CY7C185-35VC from Cypress Semiconductor is an 8K × 8 (64 Kbit) CMOS static RAM with 35 ns maximum access time, TTL-compatible I/O, and dual chip enable (CE1 active-low, CE2 active-high) for flexible memory expansion. It operates at 5V ±10%, delivers 100 mA max operating current and 20/15 mA standby current (ISB1/ISB2), and supports industrial temperature range (–40°C to +85°C) in a 28-pin SOJ package. Used in legacy industrial controllers and embedded systems requiring non-volatile SRAM buffering.
For engineers reviewing the CY7C185-35VC datasheet, CY7C185-35VC pinout, CY7C185-35VC application, or CY7C185-35VC equivalent, key selection criteria include tAA = 35 ns access timing, automatic power-down via CE1/CE2, three-state I/O control via OE/WE, and compatibility with 5V TTL bus interfaces in space-constrained SOJ layouts.
Technical Context
The CY7C185-35VC implements a 256 × 32 × 8 memory array with separate row/column decoders, sense amplifiers, and input buffers. Its dual CE architecture enables hierarchical memory mapping-CE1 selects the device while CE2 enables read/write gating, allowing seamless integration into multi-chip address spaces without external logic.
Write operations require simultaneous CE1 = LOW, CE2 = HIGH, and WE = LOW; reads occur when CE1 = LOW, CE2 = HIGH, OE = LOW, and WE = HIGH. Output drivers enter high-impedance state when CE1 = HIGH, CE2 = LOW, or OE = HIGH-ensuring bus isolation during deselect or power-down.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 8,192 words × 8 bits (64 Kbit); supports byte-wide data transfers without bit-slicing logic. |
| Access Time (tAA) | 35 ns max; defines minimum clock-to-data delay in synchronous read cycles. |
| Supply Voltage | 5 V ±10%; compatible with standard TTL/CMOS 5V logic rails and legacy power domains. |
| Operating Current (ICC) | 100 mA max; determines thermal load and regulator sizing in continuous-read scenarios. |
| Standby Current (ISB1/ISB2) | 20/15 mA; enables 70% power reduction during deselection-critical for low-duty-cycle polling systems. |
| I/O Interface | TTL-compatible inputs/outputs; eliminates level-shifting requirements in mixed-logic designs. |
| Temperature Range | –40°C to +85°C; qualified for industrial environments including factory automation and motor drives. |
Pinout & Package
Package: 28-pin SOJ (Small Outline J-Lead), 300-mil width, lead pitch 0.050", JEDEC MS-012AC compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A12 | Address Inputs | 13-bit address bus (8K = 2¹³); A0 least significant, A12 most significant. |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit shared data path; high-impedance when OE inactive or chip deselected. |
| CE1 | Chip Enable 1 (active-low) | Primary selection signal; initiates power-up and enables internal logic when LOW. |
| CE2 | Chip Enable 2 (active-high) | Secondary gating signal; must be HIGH with CE1 LOW to activate memory access. |
| OE | Output Enable (active-low) | Controls output drivers only; does not affect internal state or power mode. |
| WE | Write Enable (active-low) | Directs I/O direction: LOW = write, HIGH = read (when CE1/CE2 enabled). |
| VCC | Power Supply | +5 V supply pin; decoupling required within 10 mm of pin per layout guidelines. |
| GND | Ground Reference | Signal and power return; requires low-inductance connection to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Power-Down | Drops ICC to 20 mA (ISB1) when CE1 ≥ VIH or CE2 ≤ VIL-no external control logic needed. |
| Fast tDOE (15 ns) | Minimizes OE-to-valid-data latency, enabling tight timing margins in burst-mode read sequences. |
| Three-State Outputs | Guaranteed high-impedance on I/O pins when CE1 HIGH, CE2 LOW, OE HIGH, or WE LOW-prevents bus contention. |
| Alpha Particle Immunity | Die coat layer mitigates soft errors in radiation-prone environments (e.g., industrial enclosures near motors). |
| Easy Memory Expansion | Dual CE architecture allows stacking multiple CY7C185 devices using address decoding without glue logic. |
Applications
| Industrial PLC Data Buffering | Legacy Medical Instrument Memory |
|---|---|
|
Use Scenario: Storing real-time sensor logs and configuration registers in programmable logic controllers with 5V backplane buses. IC Role / Device Role / Timing Role: Byte-accessible SRAM buffer interfacing directly to 8-bit microcontroller data bus with CE1/CE2 decoded from upper address lines. Use Value: 35 ns tAA ensures deterministic response under 28.6 MHz bus clock (35 ns cycle), while ISB1 = 20 mA reduces idle power by >70% during scan pauses. |
Use Scenario: Holding calibration coefficients and patient history snapshots in FDA-cleared diagnostic equipment with long product lifecycles. IC Role / Device Role / Timing Role: Non-volatile shadow RAM paired with EEPROM; retains data during power loss via backup capacitor and fast write-enable timing. Use Value: tPWE = 20 ns and tSD = 12 ns allow reliable writes even with marginal MCU GPIO timing margins, reducing firmware validation effort. |
| Avionics Display Frame Buffer | Test Equipment Pattern Storage |
|
Use Scenario: Capturing and displaying flight parameter overlays on monochrome LCD panels in certified avionics subsystems. IC Role / Device Role / Timing Role: Dedicated display memory mapped to video controller's address space; accessed via CE2-gated page selects. Use Value: SOJ package meets IPC-A-610 Class 3 solder joint reliability; tHZOE = 10 ns ensures clean pixel update transitions without ghosting. |
Use Scenario: Storing digital stimulus/response patterns in automated test equipment (ATE) for semiconductor wafer probing. IC Role / Device Role / Timing Role: High-speed pattern buffer synchronized to tester clock; accessed in burst mode with CE1 strobed per vector. Use Value: 100 mA ICC supports sustained 20 MHz read bursts; CIN/COUT = 7 pF minimizes signal integrity degradation on 50 Ω trace layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8K × 8 SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IS61LV25616AL-10TLI | 16-bit bus, 256K × 16 organization, 10 ns access, 3.3 V supply only. | Requires data bus width adaptation and voltage translation; unsuitable for 5V-only systems. | Select only if migrating to 3.3 V architecture and needing higher density; not drop-in compatible. |
| AS6C4008-35TIN | Same 8K × 8 organization, 35 ns access, 5 V supply, but no CE2 pin-uses single CE only. | Lacks hierarchical enable; requires redesign of address decode logic to eliminate CE2 dependency. | Use when simplifying board layout is prioritized over existing CE2-based memory map reuse. |
Compared with IS61LV25616AL-10TLI and AS6C4008-35TIN, the CY7C185-35VC uniquely retains dual CE support and 5V TTL compatibility-preserving legacy system timing, voltage, and decode architecture without interface redesign.
Availability
CY7C185-35VC is available at Aetrix Electronics and suitable for industrial PLC data buffering, legacy medical instrument memory, avionics display frame buffering, and test equipment pattern storage requiring stable component supply across extended product lifecycles.
Supply support for CY7C185-35VC 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, microcontrollers, and programmable logic solutions for industrial and automotive markets.
The CY7C185 belongs to Cypress's legacy parallel SRAM product line, designed specifically for 5V embedded systems requiring pin-compatible upgrade paths from bipolar or earlier CMOS SRAMs in industrial control and instrumentation.
FAQ
Is CY7C185-35VC RoHS-compliant?
No-CY7C185-35VC was manufactured prior to RoHS Directive 2002/95/EC implementation and contains leaded solder in its SOJ package. It is exempt under Annex III for industrial spare parts and legacy system maintenance per EU Commission Decision 2005/717/EC.
Can CY7C185-35VC operate at 3.3 V?
No-its absolute maximum ratings specify VCC = –0.5 V to +7.0 V, but electrical characteristics (VOH/VOL, ICC, tAA) are only guaranteed at 5 V ±10%. Operation below 4.5 V violates datasheet minima and risks timing violations or data corruption.
What is the function of the NC pin on CY7C185-35VC?
Pin 13 is marked "NC" (No Connect) in the SOJ pinout. It is internally unconnected and must remain floating-no external pull-up, pull-down, or routing is permitted, as it has no electrical function or bonding wire.
Does CY7C185-35VC support battery backup operation?
Yes-its ISB2 = 15 mA at VCC = 5 V and VIN ≤ 0.3 V allows direct connection to a backup lithium cell (e.g., BR2032) through a diode, maintaining data retention during main power loss without external power-switching circuitry.
CY7C185-35VC 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
CY7C185-35VC FAQ
1.How can I place an order for CY7C185-35VC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C185-35VC 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 CY7C185-35VC reliable?
The price and inventory of CY7C185-35VC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C185-35VC is usually 5 days.
3.What payment methods are accepted for CY7C185-35VC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C185-35VC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C185-35VC?
CY7C185-35VC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C185-35VC 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 CY7C185-35VC?
For technical support, including CY7C185-35VC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C185-35VC requirements.
6.How does Aetrix verify that CY7C185-35VC is sourced from the original manufacturer or authorized distributors?
All CY7C185-35VC 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 CY7C185-35VC meets industry standards.
7.What is the process for return or replacement of CY7C185-35VC?
All CY7C185-35VC units undergo pre-shipment inspection (PSI). If there is an issue with CY7C185-35VC, 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 CY7C185-35VC part is unused and in its original packaging.
Return procedure for CY7C185-35VC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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