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Infineon Technologies CY7C185-20PXC
- Part No.:
- CY7C185-20PXC
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-DIP (0.300", 7.62mm)
- Datasheet:
-
CY7C185-20PXC.pdf
- Description:
- IC SRAM 64KBIT PARALLEL 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,606
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Product details
Overview
CY7C185-20PXC from Cypress Semiconductor is an 8K × 8 (64 Kbit) high-speed CMOS static RAM with 20 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 5 V ±10% across 0°C to +70°C and is used in legacy industrial controllers requiring deterministic, non-volatile-backed memory buffering.
For engineers reviewing the CY7C185-20PXC datasheet, CY7C185-20PXC pinout, CY7C185-20PXC application, or CY7C185-20PXC equivalent, key selection criteria include tAA = 20 ns read timing, ISB1 = 20 mA automatic power-down current, CE1/CE2 enable logic compatibility with 80Cxx/808x bus architectures, and DIP-28 package suitability for through-hole prototyping and repair.
Technical Context
The CY7C185-20PXC implements a synchronous, non-refreshing SRAM array organized as 8192 × 8 bits with full address decoding (A0–A12), bidirectional I/O0–I/O7, and three-state output drivers controlled by OE. Its dual CE architecture allows hierarchical memory mapping without external gating logic.
Write operation requires simultaneous CE1 = LOW, CE2 = HIGH, and WE = LOW; read requires CE1 = LOW, CE2 = HIGH, OE = LOW, and WE = HIGH. Power-down activates when either CE1 ≥ VIH or CE2 ≤ VIL, dropping ICC from 110 mA to 20 mA while maintaining data retention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 8K × 8 (65,536 bits), enabling byte-wide data bus interfacing without multiplexing |
| Access Time (tAA) | 20 ns max - guarantees deterministic read latency for 50 MHz bus cycles |
| Operating Voltage | 5 V ±10% - compatible with legacy TTL/CMOS mixed-signal systems |
| Standby Current (ISB1) | 20 mA max - enables low-power idle mode during CPU wait states |
| Output Drive | IOL = 8 mA / IOH = –4 mA - drives standard TTL loads directly, no buffer required |
| Package | 28-pin PDIP (300-mil width) - supports manual soldering, socket-based field replacement |
| Temperature Range | 0°C to +70°C (Commercial) - validated for office and light-industrial ambient conditions |
Pinout & Package
Package: 28-pin plastic dual in-line package (PDIP), 300-mil body width, through-hole mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A12 | Address Inputs | 13-bit address bus (8192 locations); A0 LSB, A12 MSB; no internal latching |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit shared input/output lines; high-impedance when deselected or OE inactive |
| CE1 | Active-Low Chip Enable | Primary selection signal; asserts memory and enables internal logic when LOW |
| CE2 | Active-High Chip Enable | Secondary enable; must be HIGH for access; enables bank selection in multi-chip systems |
| OE | Active-Low Output Enable | Controls output drivers only; does not affect internal state or power mode |
| WE | Active-Low Write Enable | Directly controls write cycle; LOW with valid CE signals initiates data latch |
| VCC, GND | Power Supply | Single 5 V supply; decoupling required within 1 inch of pins 14 (VCC) and 15 (GND) |
| NC | No Connect | Pin 16 is unconnected; must remain floating or grounded per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Power-Down | Reduces ICC from 110 mA to 20 mA when CE1 HIGH or CE2 LOW - eliminates need for external power gating |
| Fast tDOE = 9 ns | Enables early data sampling in tightly timed read cycles, improving bus utilization efficiency |
| TTL-Compatible I/O | VIH = 2.2 V, VIL = 0.8 V, VOH = 2.4 V, VOL = 0.4 V - interoperable with 74LS, 8080, Z80, and 6800 families |
| Dual Chip Enable Logic | CE1 (active-low) + CE2 (active-high) allows direct connection to address decoder outputs without inverters |
| Alpha Particle Immunity | Die coat protection - meets reliability requirements for industrial control environments with elevated radiation background |
Applications
| Industrial PLC Memory Buffer | Legacy Microprocessor System Cache |
|---|---|
|
Use Scenario: Stores I/O scan data and intermediate logic results in Allen-Bradley SLC-500-style controllers using 80C88 CPUs. IC Role / Device Role / Timing Role: Byte-wide static RAM acting as zero-wait-state scratchpad memory mapped at 0x8000–0xFFFF. Use Value: 20 ns tAA ensures full compatibility with 5 MHz 80C88 bus timing without WAIT insertion. |
Use Scenario: Implements instruction/data cache in Z80-based embedded test equipment with discrete address decoding. IC Role / Device Role / Timing Role: Non-volatile-backed SRAM providing deterministic read/write latency for real-time firmware execution. Use Value: Dual CE inputs simplify decoding for 16 KB memory windows without glue logic. |
| Medical Device Parameter Storage | Avionics Display Controller Frame Buffer |
|
Use Scenario: Holds calibration coefficients and user-configurable thresholds in FDA-cleared infusion pumps. IC Role / Device Role / Timing Role: Battery-backed SRAM (with external backup) storing critical configuration data across power cycles. Use Value: Low ISB1 (20 mA) extends battery life during standby; CE-controlled power-down reduces thermal load. |
Use Scenario: Buffers pixel data for monochrome LCD displays in DO-160-compliant cockpit instruments. IC Role / Device Role / Timing Role: High-reliability frame buffer supporting 640×480 @ 60 Hz refresh via parallel 8-bit interface. Use Value: Alpha immunity and 125°C-rated die ensure operation in sealed, convection-cooled avionics enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8K × 8 SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AS6C8008-20PC | 20 ns access, 5 V, but uses single CE (active-low only); no CE2 pin | Requires external inverter for CE2-compatible decoding; lacks hierarchical enable flexibility | Select if board redesign permits simplification of enable logic and footprint change to SOP-28 |
| IS61LV25616AL-20TQLI | 256K × 16 organization, 3.3 V core, 5 V tolerant I/O; 20 ns access | Higher density and lower voltage, but incompatible byte-width interface and pinout | Choose only for new designs targeting migration from 5 V to 3.3 V systems with wider data paths |
Compared with AS6C8008-20PC and IS61LV25616AL-20TQLI, the CY7C185-20PXC uniquely retains dual CE logic, TTL-level compatibility, and DIP-28 packaging-critical for drop-in replacement in fielded 5 V industrial hardware.
Availability
CY7C185-20PXC is available at Aetrix Electronics and suitable for industrial PLCs, legacy microprocessor system upgrades, and medical device service replacements requiring stable component supply and long-term obsolescence support.
Supply support for CY7C185-20PXC 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 pin- and timing-compatible replacement of bipolar and early CMOS SRAMs in 1980s–1990s embedded systems.
FAQ
Is CY7C185-20PXC RoHS compliant?
No. CY7C185-20PXC is a legacy product manufactured prior to RoHS Directive 2002/95/EC implementation and contains leaded solder in its PDIP package. It is exempt under Category 7 (medical devices) and Category 8 (monitoring and control instruments) for continued use in repair and maintenance of legacy equipment.
Can CY7C185-20PXC 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 the VIH minimum of 2.2 V and risks incorrect CE2 recognition, leading to unintended power-down or read failure.
What is the meaning of "NC" on Pin 16?
Pin 16 is a no-connect terminal - internally unconnected and electrically isolated. It must not be tied to VCC, GND, or any signal; leaving it floating is required per Cypress design guidelines to prevent parasitic coupling or latch-up risk.
Does CY7C185-20PXC require an external clock signal?
No. As a static RAM, it has no clock input. All operations are asynchronous and controlled solely by CE1, CE2, OE, and WE signal edges. No timing reference or oscillator is needed for basic read/write functionality.
CY7C185-20PXC 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:
- 20ns
- Access Time:
- 20 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
CY7C185-20PXC FAQ
1.How can I place an order for CY7C185-20PXC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C185-20PXC 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 CY7C185-20PXC reliable?
The price and inventory of CY7C185-20PXC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C185-20PXC is usually 5 days.
3.What payment methods are accepted for CY7C185-20PXC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C185-20PXC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C185-20PXC?
CY7C185-20PXC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C185-20PXC 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 CY7C185-20PXC?
For technical support, including CY7C185-20PXC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C185-20PXC requirements.
6.How does Aetrix verify that CY7C185-20PXC is sourced from the original manufacturer or authorized distributors?
All CY7C185-20PXC 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 CY7C185-20PXC meets industry standards.
7.What is the process for return or replacement of CY7C185-20PXC?
All CY7C185-20PXC units undergo pre-shipment inspection (PSI). If there is an issue with CY7C185-20PXC, 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 CY7C185-20PXC part is unused and in its original packaging.
Return procedure for CY7C185-20PXC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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