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Infineon Technologies CY7C185-15VI
- Part No.:
- CY7C185-15VI
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-BSOJ (0.300", 7.62mm Width)
- Datasheet:
-
CY7C185-15VI.pdf
- Description:
- IC SRAM 64KBIT PARALLEL 28SOJ
- Quantity:
- Payment:
- Shipping:
Inventory:1,519
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Product details
Overview
CY7C185-15VI from Cypress Semiconductor is an 8K × 8 (64 Kbit) CMOS static RAM with 15 ns maximum access time, 5 V ±10% supply, industrial temperature range (–40°C to +85°C), and automatic power-down reducing standby current to 15 mA. It supports memory expansion via dual chip enables (CE1 active-low, CE2 active-high) and is used in legacy industrial controllers requiring non-volatile SRAM buffering with TTL-compatible I/O.
For engineers reviewing the CY7C185-15VI datasheet, CY7C185-15VI pinout, CY7C185-15VI application, or CY7C185-15VI equivalent, key selection criteria include tAA = 15 ns read timing, ISB2 = 15 mA low-power deselected state, CE1/CE2 enable logic compatibility, and SOJ-28 package footprint for through-hole or surface-mount retrofits.
Technical Context
The CY7C185-15VI implements a synchronous, asynchronous SRAM architecture with independent address decoding (A0–A12), bidirectional 8-bit data bus (I/O0–I/O7), and three-state output control governed by OE, CE1, and CE2. Its dual-chip-enable scheme allows hierarchical memory mapping without external gating logic.
Write operation requires simultaneous assertion of CE1 (LOW), CE2 (HIGH), and WE (LOW); read requires CE1 (LOW), CE2 (HIGH), and OE (LOW) while WE remains HIGH. Power-down activates automatically when CE1 ≥ VIH or CE2 ≤ VIL, cutting ICC from 130 mA to 15 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 8,192 × 8 bits (64 Kbit); supports byte-wide data transfers without multiplexing or banking logic. |
| Access Time (tAA) | 15 ns max; enables direct interface with 68000-class microprocessors running at ≤25 MHz system clocks. |
| VCC Supply | 5 V ±10%; compatible with standard TTL/CMOS logic rails without LDO regulation. |
| Operating Temperature | –40°C to +85°C; qualified for industrial control panels, PLC backplanes, and motor drive firmware storage. |
| Standby Current (ISB2) | 15 mA max; reduces idle power by 70% vs active mode, critical for battery-backed or energy-constrained systems. |
| Output Drive | IOH = –4 mA, IOL = 8 mA; meets TTL voltage thresholds (VOH ≥ 2.4 V, VOL ≤ 0.4 V) for direct interconnection with 74LS/74HC peripherals. |
| Package | 28-pin SOJ (V21); JEDEC MS-012 compliant, 300-mil body width, lead pitch 0.050", suitable for wave-soldered legacy PCBs. |
Pinout & Package
28-pin SOJ (Small Outline J-Lead) package, 300-mil width, gull-wing leads, JEDEC MO-012AC compliant. Pin 1 marked by notch or bevel; pin 14 is NC (no connect).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A12 | Address Inputs | 13-bit address bus; selects one of 8,192 memory locations; no internal latching - requires stable address during CE1/CE2/OE assertion. |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit shared input/output lines; high-impedance when CE1 HIGH, CE2 LOW, OE HIGH, or WE HIGH during read. |
| CE1 | Chip Enable 1 (active-low) | Primary selection signal; deassertion forces automatic power-down and high-Z outputs regardless of CE2 or OE state. |
| CE2 | Chip Enable 2 (active-high) | Secondary enable; must be HIGH with CE1 LOW for valid access; enables multi-chip decode trees using inverted CE1 as CE2 input to adjacent devices. |
| OE | Output Enable (active-low) | Controls output drivers only; does not affect power state - device remains active if CE1/CE2 asserted even when OE HIGH. |
| WE | Write Enable (active-low) | Controls R/W direction: LOW enables write (data latched on rising edge of WE, CE1, or CE2), HIGH enables read (outputs enabled if CE1/CE2 selected). |
| VCC, GND | Power Supply | Single 5 V supply; decoupling capacitor (0.1 µF ceramic) required within 10 mm of VCC/GND pins to suppress switching noise. |
| NC | No Connect | Pin 14 is unconnected die pad; must remain floating - no routing or soldering permitted. |
Key Features
| Feature | Design Value |
|---|---|
| 15 ns access time with tDOE = 8 ns | Enables fast CPU wait-state elimination in 8/16-bit embedded systems without external glue logic. |
| Dual chip enable (CE1/CE2) | Supports seamless 16-bit or 32-bit memory expansion using simple NAND/NOR decoding - no address line gating needed. |
| Automatic power-down (ISB2 = 15 mA) | Reduces system-level standby power by >70% without software intervention or external sleep controllers. |
| TTL-compatible I/O levels | Eliminates level-shifting components when interfacing with legacy microcontrollers (e.g., 6800, 8085, Z80) and peripheral ICs. |
| Alpha particle immunity (die coat) | Ensures data retention in high-radiation environments such as industrial automation near welding equipment or X-ray sources. |
Applications
| Industrial PLC Data Buffer | Legacy Microcontroller Firmware Store |
|---|---|
|
Use Scenario: Real-time I/O scanning in programmable logic controllers where volatile SRAM holds temporary process variables between scan cycles. IC Role / Device Role / Timing Role: Byte-accessible 64 Kbit scratchpad memory with deterministic 15 ns read latency and CE-controlled power gating per scan phase. Use Value: Eliminates need for external address latches or wait-state generators; ISB2 = 15 mA extends backup battery life during mains failure. |
Use Scenario: Storing boot code and runtime configuration in 1990s-era industrial HMIs built around Motorola 68EC000 CPUs. IC Role / Device Role / Timing Role: Non-multiplexed, pin-compatible SRAM replacing obsolete 27C512 EPROMs in socketed firmware slots with zero cycle penalty. Use Value: Enables field-upgradable firmware without UV erasers; TTL I/O ensures drop-in replacement without board redesign. |
| Motor Drive Parameter Cache | Medical Diagnostic Equipment FIFO |
|
Use Scenario: Caching PID coefficients and sensor calibration tables in servo amplifier modules operating in harsh EMI environments. IC Role / Device Role / Timing Role: Radiation-hardened SRAM buffer holding real-time tuning parameters accessed synchronously with PWM update interrupts. Use Value: Die coat prevents bit flips from electromagnetic transients near IGBT switching nodes; SOJ package withstands thermal cycling. |
Use Scenario: Temporary image frame buffering in portable ultrasound units where data throughput must exceed 20 MB/s with minimal latency jitter. IC Role / Device Role / Timing Role: High-speed, low-skew memory stage between ADC pipeline and DSP engine, synchronized to fixed 15 ns clock edges. Use Value: tLZOE = 3 ns and tHZOE = 7 ns minimize bus turnaround time, enabling full-duplex burst transfers without dead cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar static RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AS6C8008-15TIN | Same 8K×8 organization and 15 ns speed, but 3.3 V only; no 5 V tolerance; ISB = 2 µA typical (vs 15 mA). | Requires level shifters or separate 3.3 V rail; unsuitable for direct 5 V TTL replacement. | Select only if migrating to modern low-voltage design with full 3.3 V ecosystem. |
| IS61LV5128-15KLI | 5 V tolerant, 15 ns, 512K×8 (4 Mbit); larger density; ISB = 25 µA; SOJ-32 package (pin incompatible). | Cannot replace CY7C185-15VI without PCB redesign due to 32-pin footprint and different pinout. | Choose only for new designs needing higher density and lower standby current - not for drop-in upgrade. |
Compared with AS6C8008-15TIN and IS61LV5128-15KLI, the CY7C185-15VI uniquely delivers 5 V TTL compatibility, SOJ-28 pinout, and industrial temperature rating in a single legacy-optimized package - making it irreplaceable for repair, refurbishment, or continuity sourcing of discontinued systems.
Availability
CY7C185-15VI is available at Aetrix Electronics and suitable for industrial PLC upgrades, legacy medical device repairs, and motor drive controller refurbishments requiring stable component supply across extended product lifecycles.
Supply support for CY7C185-15VI 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 clock solutions for industrial and automotive markets.
The CY7C185 belongs to Cypress's legacy parallel SRAM product line, designed specifically for pin- and function-compatible replacement of aging 27-series EPROMs and early-generation CMOS SRAMs in long-lifecycle industrial hardware.
FAQ
Is CY7C185-15VI RoHS-compliant?
No. CY7C185-15VI was manufactured prior to RoHS enforcement and contains lead in its SOJ solder finish and die attach. It is exempt under EU RoHS Annex III for spare parts supporting legacy equipment with no technically feasible alternative. Aetrix provides full material declarations upon request.
Can CY7C185-15VI operate at 3.3 V?
No. The device is specified only for 5 V ±10% (4.5 V to 5.5 V). Operation below 4.5 V violates VOH/VOL specifications and risks data corruption or undefined output states. It lacks 3.3 V core logic or I/O tolerance.
What is the function of pin 14 (NC)?
Pin 14 is a no-connect terminal - internally unconnected to the die. It must remain electrically floating and unsoldered. Routing traces to or placing solder on this pin may cause mechanical stress or shorting to adjacent leads in the SOJ package.
Does CY7C185-15VI support battery backup?
Yes - its automatic power-down mode (ISB2 = 15 mA) and TTL-compatible inputs allow integration with external lithium coin-cell circuits. However, Cypress does not integrate on-chip battery switchover; external diode-OR or dedicated backup controllers are required for seamless transition.
CY7C185-15VI 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:
- 15ns
- Access Time:
- 15 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOJ
CY7C185-15VI FAQ
1.How can I place an order for CY7C185-15VI through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C185-15VI 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 CY7C185-15VI reliable?
The price and inventory of CY7C185-15VI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C185-15VI is usually 5 days.
3.What payment methods are accepted for CY7C185-15VI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C185-15VI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C185-15VI?
CY7C185-15VI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C185-15VI 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 CY7C185-15VI?
For technical support, including CY7C185-15VI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C185-15VI requirements.
6.How does Aetrix verify that CY7C185-15VI is sourced from the original manufacturer or authorized distributors?
All CY7C185-15VI 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 CY7C185-15VI meets industry standards.
7.What is the process for return or replacement of CY7C185-15VI?
All CY7C185-15VI units undergo pre-shipment inspection (PSI). If there is an issue with CY7C185-15VI, 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 CY7C185-15VI part is unused and in its original packaging.
Return procedure for CY7C185-15VI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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