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Infineon Technologies CY7C185-20PC
- Part No.:
- CY7C185-20PC
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-DIP (0.300", 7.62mm)
- Datasheet:
-
CY7C185-20PC.pdf
- Description:
- IC SRAM 64KBIT PARALLEL 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,057
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Product details
Overview
CY7C185-20PC 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 commercial temperature range (0°C to +70°C) and is used in legacy industrial controllers and embedded instrumentation requiring deterministic, non-volatile-backed memory access.
For engineers reviewing the CY7C185-20PC datasheet, CY7C185-20PC pinout, CY7C185-20PC application, or CY7C185-20PC equivalent, key selection criteria include tAA = 20 ns read timing, ISB1 = 20 mA automatic power-down current, CE1/CE2 dual-enable expansion capability, and 28-pin DIP package compatibility with through-hole PCB layouts.
Technical Context
The CY7C185-20PC implements a synchronous, address-decoded SRAM array with independent row/column decoding, sense amplifiers, and three-state bidirectional I/O drivers. Its dual chip enable architecture allows seamless bank expansion without external logic, while automatic power-down triggers when CE1 ≥ VIH or CE2 ≤ VIL - reducing ICC from 110 mA to 20 mA.
Read operations require CE1 = LOW, CE2 = HIGH, OE = LOW, and WE = HIGH; writes occur when CE1 = LOW, CE2 = HIGH, and WE = LOW. All I/O pins enter high-impedance state if CE1 = HIGH, CE2 = LOW, or OE = HIGH - ensuring bus isolation during deselect or output disable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 8,192 words × 8 bits (64 Kbit); supports byte-wide data interface without multiplexing |
| Access Time (tAA) | 20 ns max; guarantees valid data on I/O0–I/O7 within 20 ns of stable address and CE1/OE assertion |
| Operating Current (ICC) | 110 mA max at VCC = 5.5 V; defines worst-case active power dissipation (≈715 mW) |
| Standby Current (ISB1) | 20 mA max under automatic power-down; enables low-power hold mode during idle cycles |
| Input/Output Voltage | TTL-compatible: VIH = 2.2 V min, VIL = 0.8 V max, VOH = 2.4 V min, VOL = 0.4 V max |
| Package | 28-pin plastic DIP (300-mil width); pin-compatible with industry-standard 28-pin memory sockets |
| Temperature Range | Commercial: 0°C to +70°C; validated for use in non-automotive, non-military board-level applications |
Pinout & Package
Package: 28-pin plastic dual in-line package (DIP), 300-mil body width, through-hole mountable. Pin 1 marked by notch or dot; top view orientation per datasheet Figure 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A12 | Address Inputs | 13-bit address bus; selects one of 8,192 memory locations; no internal latching |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit shared input/output lines; high-impedance when deselected or OE disabled |
| CE1 | Active-Low Chip Enable | Primary enable; device active only when CE1 = LOW and CE2 = HIGH |
| CE2 | Active-High Chip Enable | Secondary enable; must be HIGH for selection; enables multi-chip decode with CE1 |
| OE | Active-Low Output Enable | Controls output driver enable; data appears on I/O only when OE = LOW during read |
| WE | Active-Low Write Enable | Controls direction: WE = LOW → write; WE = HIGH → read or high-Z |
| VCC | Power Supply | +5 V ±10% supply; powers core logic and I/O buffers |
| GND | Ground Reference | Signal and power return; decoupling capacitor required at pin 14 |
Key Features
| Feature | Design Value |
|---|---|
| Dual Chip Enable Interface | CE1 (active-low) and CE2 (active-high) allow hierarchical memory mapping without glue logic |
| Automatic Power-Down | Reduces ICC from 110 mA to 20 mA when CE1 ≥ VIH or CE2 ≤ VIL - no external control needed |
| Fast Output Enable Response | tDOE = 9 ns max ensures rapid data availability after OE assertion - critical for burst-read systems |
| TTL-Compatible Signaling | Direct interface with 74LS/74HC logic families; eliminates level-shifting components |
| High Noise Immunity | VIL = 0.8 V max and VIH = 2.2 V min provide 0.4 V noise margin under 5 V operation |
Applications
| Industrial PLC Memory Buffer | Legacy Test Equipment Data Cache |
|---|---|
|
Use Scenario: Stores real-time sensor acquisition buffers and command queue entries in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Byte-accessible SRAM providing deterministic 20 ns read/write latency for cyclic scan execution. Use Value: Dual CE inputs simplify multi-slot memory expansion across I/O modules without address decoder ICs. |
Use Scenario: Holds waveform sample sets and calibration coefficients in benchtop oscilloscopes and signal generators. IC Role / Device Role / Timing Role: Non-refreshed, low-latency storage for high-speed ADC/DAC data path buffering. Use Value: Automatic power-down cuts standby current to 20 mA during instrument sleep mode - extending fanless operation. |
| Embedded HMI Display Frame Buffer | Communications Protocol Stack Buffer |
|
Use Scenario: Serves as monochrome graphics frame buffer for 320×240 LCD controllers in factory HMIs. IC Role / Device Role / Timing Role: Static memory mapped to CPU address space for direct pixel write access. Use Value: 28-pin DIP package enables manual rework and socket-based replacement in long-lifecycle panels. |
Use Scenario: Buffers UART/RS-485 packet payloads and protocol state variables in serial gateway firmware. IC Role / Device Role / Timing Role: Dedicated scratchpad memory for interrupt-driven packet assembly/disassembly. Use Value: tLZOE = 3 ns and tHZOE = 8 ns support tight timing margins in full-duplex serial ISR contexts. |
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 | Same 8K × 8 organization, 20 ns access, but uses single active-low CE and lacks CE2; standby current 30 mA | No dual-enable expansion; requires external gating for multi-bank designs | Select when board layout lacks space for CE2 routing or system uses simple single-bank addressing |
| IS61LV25616AL-20TQLI | 16-bit bus, 256K × 16 organization; 20 ns access; 3.3 V only; SOIC-44 package | Higher density and lower voltage, but incompatible pinout and bus width | Choose only for new designs targeting 3.3 V migration and wider data paths - not drop-in compatible |
Compared with AS6C8008-20PC and IS61LV25616AL-20TQLI, the CY7C185-20PC uniquely supports hierarchical memory decoding via CE1/CE2 and maintains 5 V TTL compatibility - making it irreplaceable in legacy 5 V industrial backplanes where bus loading and voltage translation must be avoided.
Availability
CY7C185-20PC is available at Aetrix Electronics and suitable for industrial PLCs, legacy test equipment, embedded HMI displays, and communications protocol gateways requiring stable component supply over extended production lifecycles.
Supply support for CY7C185-20PC 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 specializing in memory, microcontrollers, and programmable logic solutions for industrial and embedded markets.
The CY7C185 belongs to Cypress's legacy parallel SRAM product line, designed specifically for 5 V systems requiring pin-compatible replacements for aging NMOS and early CMOS memory devices in industrial control and instrumentation.
FAQ
Is CY7C185-20PC RoHS compliant?
No. CY7C185-20PC was manufactured prior to RoHS Directive enforcement and contains leaded solder terminations and Pb in the die attach. It is exempt under Annex III for industrial spare parts and legacy system repair - documentation available upon request.
Can CY7C185-20PC 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 may cause data corruption or increased tAA beyond 20 ns. No 3.3 V variant exists in this family.
What is the function of NC pin on CY7C185-20PC?
Pin 13 is marked "NC" (No Connect) in the datasheet pinout diagram and has no internal connection. It must remain unconnected - tying it to VCC, GND, or any signal violates the device's electrical specification and may induce latch-up.
Does CY7C185-20PC support battery backup?
No. It lacks built-in battery-switching circuitry or VBAT pin. External backup requires discrete diode-OR and capacitor hold-up design, with minimum VCC decay time exceeding tPD (20 ns) to prevent data loss during power transition.
CY7C185-20PC 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
CY7C185-20PC FAQ
1.How can I place an order for CY7C185-20PC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C185-20PC 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 CY7C185-20PC reliable?
The price and inventory of CY7C185-20PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C185-20PC is usually 5 days.
3.What payment methods are accepted for CY7C185-20PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C185-20PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C185-20PC?
CY7C185-20PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C185-20PC 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 CY7C185-20PC?
For technical support, including CY7C185-20PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C185-20PC requirements.
6.How does Aetrix verify that CY7C185-20PC is sourced from the original manufacturer or authorized distributors?
All CY7C185-20PC 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 CY7C185-20PC meets industry standards.
7.What is the process for return or replacement of CY7C185-20PC?
All CY7C185-20PC units undergo pre-shipment inspection (PSI). If there is an issue with CY7C185-20PC, 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 CY7C185-20PC part is unused and in its original packaging.
Return procedure for CY7C185-20PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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