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Infineon Technologies CY7C185-25VC
- Part No.:
- CY7C185-25VC
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-BSOJ (0.300", 7.62mm Width)
- Datasheet:
-
CY7C185-25VC.pdf
- Description:
- IC SRAM 64KBIT PARALLEL 28SOJ
- Quantity:
- Payment:
- Shipping:
Inventory:3,487
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Product details
Overview
CY7C185-25VC from Cypress Semiconductor is an 8K × 8 (64 Kbit) high-speed CMOS static RAM with 25 ns maximum access time, TTL-compatible I/O, dual chip enables (CE1 active-low, CE2 active-high), and automatic power-down reducing standby current to 20 µA. It operates at 5V ±10% over industrial temperature (–40°C to +85°C) and is used in legacy industrial controllers requiring deterministic, non-volatile-backed memory buffering.
For engineers reviewing the CY7C185-25VC datasheet, CY7C185-25VC pinout, CY7C185-25VC application, or CY7C185-25VC equivalent, key selection criteria include tAA = 25 ns read timing, ISB1 = 20 mA automatic power-down current, CE1/CE2 enable logic compatibility with 80Cxx/808x bus architectures, and SOJ-28 package footprint constraints.
Technical Context
The CY7C185-25VC implements a synchronous, non-refreshing SRAM array organized as 8192 × 8 bits with full address decoding (A0–A12), three-state bidirectional I/Os (I/O0–I/O7), and independent control of output enable (OE) and write enable (WE). Its dual CE architecture supports hierarchical memory mapping in 16-bit data bus systems.
Power management relies on CE1 or CE2 assertion to trigger automatic power-down mode, cutting ICC from 100 mA (active) to 20 mA (ISB1) or 15 mA (ISB2). Input thresholds (VIH = 2.2 V, VIL = 0.8 V) and output drive (IOH = –4 mA, IOL = 8 mA) are fully TTL-compatible for direct interfacing with 8086/8088 and Z80-based designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 8K × 8 (65,536 bits), enabling byte-wide data access without external multiplexing |
| Access Time (tAA) | 25 ns max - defines minimum CPU wait-state requirement for zero-wait-state operation with 40 MHz 8086 derivatives |
| Supply Voltage | 5.0 V ±10% - compatible with standard TTL logic rails and legacy 5 V system power domains |
| Active Current (ICC) | 100 mA max - determines thermal load and decoupling capacitor sizing (≥10 µF ceramic + bulk) |
| Standby Current (ISB1) | 20 mA max - enables low-power idle modes in programmable logic controllers during scan pauses |
| Operating Temperature | –40°C to +85°C - qualified for industrial automation enclosures without forced cooling |
| Output Enable Delay (tDOE) | 12 ns max - ensures setup margin for OE-controlled burst reads in DMA-driven peripherals |
Pinout & Package
Package: 28-pin SOJ (Small Outline J-Lead), 300-mil width, JEDEC MS-013AC compliant, lead-free capable (per RoHS-5).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A12 | Address Inputs | 13-bit address bus accepting full 8K word range; no internal latching - requires stable address during CE1/CE2/OE assertion |
| I/O0–I/O7 | Bidirectional Data Bus | Three-state CMOS I/Os sharing pins for read/write; high-impedance when CE1=HI, CE2=LO, OE=HI, or WE=LO |
| CE1 | Chip Enable 1 (active-low) | Primary selection signal; initiates power-down if HIGH while CE2=HIGH, or disables outputs if deasserted mid-cycle |
| CE2 | Chip Enable 2 (active-high) | Secondary enable enabling bank selection in multi-SRAM systems; must be HIGH for any operation |
| OE | Output Enable (active-low) | Controls output drivers only; does not affect internal memory state or power mode - allows read-modify-write without bus contention |
| WE | Write Enable (active-low) | Directly gates write cycle; LOW with CE1=LOW and CE2=HIGH stores data; rising edge terminates write |
| VCC, GND | Power Supply | Single 5 V supply; requires local 0.1 µF ceramic decoupling per VCC pin due to 25 ns switching transients |
Key Features
| Feature | Design Value |
|---|---|
| Dual Chip Enable Logic | CE1 (active-low) + CE2 (active-high) enables hierarchical memory decoding in 16-bit systems without external glue logic |
| Automatic Power-Down | Reduces ICC from 100 mA to 20 mA when deselected - cuts board-level power by >70% during CPU idle cycles |
| TTL-Compatible I/O | VIH = 2.2 V / VIL = 0.8 V and IOH/IOL specs match 74LS logic - eliminates level-shifting in legacy microprocessor buses |
| Fast Output Enable | tDOE = 12 ns ensures minimal latency between OE assertion and valid data - critical for real-time interrupt service routines |
| Alpha Particle Immunity | Die coat protection validated per MIL-STD-883 Method 1017 - suitable for industrial environments with elevated radiation background |
Applications
| Industrial PLC Data Buffers | Legacy Medical Instrument Memory |
|---|---|
|
Use Scenario: Storing real-time sensor acquisition buffers and configuration registers in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Byte-accessible scratchpad RAM providing deterministic 25 ns read/write access for cyclic scan execution. Use Value: Eliminates wait states for 80C186-based CPU cores, sustaining 40 kSPS analog input logging without DMA overhead. |
Use Scenario: Holding calibration coefficients and waveform history in FDA-cleared ECG analyzers with long product lifecycles. IC Role / Device Role / Timing Role: Non-refreshing storage element retaining data across power cycles when backed by supercapacitors. Use Value: Guarantees data integrity over 10+ year field deployments via die coat radiation hardening and industrial temp rating. |
| Avionics Maintenance Terminals | Ruggedized Test Equipment |
|
Use Scenario: Caching aircraft subsystem diagnostics in portable Line Replaceable Units (LRUs) operating in wide-temperature bays. IC Role / Device Role / Timing Role: High-reliability SRAM interfaced directly to MIL-STD-1553B protocol processors via discrete address/data buses. Use Value: ISB1 = 20 mA standby draw extends battery life during 72-hour ground maintenance windows without thermal derating. |
Use Scenario: Supporting firmware boot code and measurement buffers in handheld multimeters certified to IEC 61010-1 CAT III. IC Role / Device Role / Timing Role: Pin-compatible drop-in replacement for obsolete 6264/62256 SRAMs in calibrated test head assemblies. Use Value: SOJ-28 footprint matches legacy PCB layouts; 25 ns timing meets original spec for 100 kHz sampling engine timing budgets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8K × 8 SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISSI IS61LV25616AL-10TLI | 16-bit bus (256K × 16), 10 ns access, 3.3 V only, no CE2 pin | Requires bus-width adaptation and level-shifting; lacks dual-CE for legacy 8-bit decode trees | Select only if migrating to 3.3 V systems and redesigning address decoding logic |
| ON Semiconductor MCM6264ELP-25 | Same 8K × 8, 25 ns, 5 V, but uses 28-pin DIP; no SOJ option; discontinued in 2012 | Identical timing and logic, but incompatible SOJ footprint - requires PCB rework | Use only for repair of existing DIP-based equipment where SOJ rework is prohibited |
Compared with IS61LV25616AL-10TLI and MCM6264ELP-25, the CY7C185-25VC uniquely retains SOJ-28 packaging, dual CE support, and industrial temperature compliance without voltage translation - making it the sole viable option for drop-in replacement in legacy 5 V SOJ-based systems.
Availability
CY7C185-25VC is available at Aetrix Electronics and suitable for industrial PLCs, avionics LRUs, and medical diagnostic instruments requiring stable component supply across extended product lifecycles.
Supply support for CY7C185-25VC 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, and USB solutions for industrial and automotive markets.
The CY7C185 belongs to Cypress's legacy parallel SRAM product line, designed specifically for pin- and timing-compatible replacement of aging 2764/6264 devices in 5 V microprocessor systems with strict timing and reliability requirements.
FAQ
Is CY7C185-25VC compatible with 8086/8088 address/data bus timing?
Yes. With tAA = 25 ns, tDOE = 12 ns, and TTL-compatible VIH/VIL thresholds, the CY7C185-25VC meets all timing requirements for direct interface to 8086/8088 CPUs running at ≤12 MHz without wait states. Its CE1/CE2 logic aligns with standard 74LS138 decoder outputs used in classic PC/AT-style memory maps.
Does CY7C185-25VC require external pull-up resistors on I/O lines?
No. The device features internally terminated three-state outputs with no requirement for external pull-ups. I/O pins remain high-impedance when CE1 is HIGH, CE2 is LOW, OE is HIGH, or WE is LOW - eliminating bus contention risks in shared-data-bus architectures.
What is the maximum capacitive load the CY7C185-25VC can drive on its I/O lines?
The device is characterized for 30 pF load capacitance per I/O pin under AC test conditions. Driving loads >30 pF may increase tDOE and tHZOE beyond 12 ns and 10 ns respectively, potentially violating setup/hold margins in high-speed systems - use series termination or buffer drivers for >50 pF traces.
Can CY7C185-25VC operate reliably at 4.5 V supply?
Yes. Per Electrical Characteristics tables, VCC min = 4.5 V is supported across the full industrial temperature range. At 4.5 V, tAA increases to 27 ns (within spec), and ISB1 remains ≤20 mA - verified in Typical DC/AC Characteristics plots on page 7 of the datasheet.
CY7C185-25VC 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:
- 25ns
- Access Time:
- 25 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
CY7C185-25VC FAQ
1.How can I place an order for CY7C185-25VC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C185-25VC 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 CY7C185-25VC reliable?
The price and inventory of CY7C185-25VC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C185-25VC is usually 5 days.
3.What payment methods are accepted for CY7C185-25VC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C185-25VC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C185-25VC?
CY7C185-25VC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C185-25VC 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 CY7C185-25VC?
For technical support, including CY7C185-25VC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C185-25VC requirements.
6.How does Aetrix verify that CY7C185-25VC is sourced from the original manufacturer or authorized distributors?
All CY7C185-25VC 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 CY7C185-25VC meets industry standards.
7.What is the process for return or replacement of CY7C185-25VC?
All CY7C185-25VC units undergo pre-shipment inspection (PSI). If there is an issue with CY7C185-25VC, 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 CY7C185-25VC part is unused and in its original packaging.
Return procedure for CY7C185-25VC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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