My Inquiry
My Account
Infineon Technologies CY7C185-25PC
- Part No.:
- CY7C185-25PC
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-DIP (0.300", 7.62mm)
- Datasheet:
-
CY7C185-25PC.pdf
- Description:
- IC SRAM 64KBIT PARALLEL 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,952
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
CY7C185-25PC from Cypress Semiconductor is an 8K × 8 (64 Kbit) high-speed CMOS static RAM with 25 ns maximum access time, 5 V ±10% supply, TTL-compatible I/O, and dual chip enable (CE1 active-low, CE2 active-high) for flexible memory expansion. It delivers 100 mA max operating current and 20/15 mA standby current (ISB1/ISB2), supporting reliable data retention in industrial control and legacy embedded systems.
For engineers reviewing the CY7C185-25PC datasheet, CY7C185-25PC pinout, CY7C185-25PC application, or CY7C185-25PC equivalent, key selection criteria include tAA = 25 ns access timing, automatic power-down activation via CE1 or CE2, three-state I/O control via OE and WE, and compatibility with 28-pin 300-mil DIP footprint for through-hole prototyping and repair.
Technical Context
The CY7C185-25PC implements a synchronous, non-volatile-independent SRAM architecture with full address decoding (A0–A12) for 8,192 locations and bidirectional 8-bit I/O (I/O0–I/O7). Its dual CE logic enables hierarchical memory mapping-CE1 selects the device while CE2 provides polarity-flexible gating-allowing cascaded bank configurations without external logic.
Write operation requires simultaneous CE1 = LOW, CE2 = HIGH, and WE = LOW; read requires CE1 = LOW, CE2 = HIGH, OE = LOW, and WE = HIGH. Output drivers enter high-impedance state when any of CE1, CE2, or OE is deasserted, ensuring bus isolation during deselect or power-down modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 8K × 8 (65,536 bits), enabling byte-wide data access without multiplexing |
| Access Time (tAA) | 25 ns max - defines minimum clock-to-data latency in synchronous read cycles |
| Supply Voltage | 5 V ±10% - compatible with legacy 5 V TTL/CMOS system rails |
| Operating Current (ICC) | 100 mA max - determines thermal load and regulator sizing in continuous-read scenarios |
| Standby Current (ISB1) | 20 mA max - sets quiescent power draw during CE1/CE2 deselection |
| I/O Interface | TTL-compatible inputs/outputs - ensures direct interfacing with 74LS/74HC logic families |
| Package Type | 28-pin 300-mil DIP - supports manual soldering, socket-based testing, and field replacement |
Pinout & Package
The CY7C185-25PC is housed in a 28-pin, 300-mil wide plastic dual in-line package (DIP) with standard through-hole mounting and 0.1-inch pin pitch. Pin numbering follows JEDEC MS-001, with pins 1–14 on the top row (left to right) and pins 15–28 on the bottom row (right to left).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A12 | Address Inputs | 13-bit binary address bus selecting one of 8,192 memory locations |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface supporting read data output and write data input |
| CE1 | Chip Enable 1 (active-low) | Primary device select; asserts internal circuitry and enables power-up sequence |
| CE2 | Chip Enable 2 (active-high) | Secondary enable with inverted polarity-used for bank decoding or OR-gating logic |
| OE | Output Enable (active-low) | Controls three-state output drivers; must be low for valid read data on I/O lines |
| WE | Write Enable (active-low) | Gates write cycle; low with CE1/CE2 asserted initiates data latching into memory array |
| VCC | Power Supply | +5 V supply pin (pin 28); decoupling capacitor placement critical for noise immunity |
| GND | Ground Reference | Signal and power ground (pin 14); must be low-inductance connection to minimize switching noise |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Power-Down | Reduces ICC to ISB1 (20 mA) when CE1 ≥ VIH or CE2 ≤ VIL-no external control logic required |
| Fast tDOE (12 ns) | Minimizes OE-to-valid-data delay, enabling tight timing margins in burst-read applications |
| Low Active Power (715 mW) | Enables use in thermally constrained enclosures without forced air cooling |
| Alpha Particle Immunity | Die coat layer suppresses soft errors-critical for industrial environments with background radiation |
| Three-State Output Drivers | Prevent bus contention during multi-device sharing; high-Z state activated by OE, CE1, or CE2 deassertion |
Applications
| Industrial PLC Memory Buffer | Legacy Instrumentation Data Cache |
|---|---|
Use Scenario: Storing real-time sensor acquisition buffers and configuration registers in programmable logic controllers operating at –40°C to +85°C. IC Role / Device Role / Timing Role: Nonvolatile-independent SRAM providing deterministic 25 ns read/write access for cyclic I/O scanning. Use Value: Dual CE architecture allows seamless integration into existing 8-bit ISA-style backplanes with minimal glue logic. | Use Scenario: Holding calibration coefficients and transient measurement snapshots in benchtop oscilloscopes and spectrum analyzers. IC Role / Device Role / Timing Role: Byte-accessible scratchpad memory synchronized to microcontroller DMA bursts. Use Value: TTL-compatible I/O eliminates level-shifter components, reducing BOM count and signal integrity risk. |
| Avionics Maintenance Terminal RAM | Medical Imaging Frame Buffer |
Use Scenario: Supporting diagnostic firmware execution and fault log storage in airborne line-replaceable units (LRUs) certified to DO-254. IC Role / Device Role / Timing Role: High-reliability static RAM with die coat protection against cosmic-ray-induced bit flips. Use Value: 20 mA ISB1 current enables battery-backed operation during main power interruption. | Use Scenario: Temporarily storing digitized X-ray or ultrasound frames before compression and transmission in portable imaging devices. IC Role / Device Role / Timing Role: Low-latency 8-bit parallel interface feeding FPGA-based pixel pipeline controllers. Use Value: 28-pin DIP package permits manual rework and long-term component availability for Class II medical device lifecycle management. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8K × 8 SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IS61LV256AL-10TLI | 3.3 V supply, 10 ns access, SOIC-28 package - no 5 V or DIP option | Requires voltage translation in 5 V systems; unsuitable for through-hole repair | Select only if migrating to 3.3 V design with surface-mount assembly capability |
| AS6C4008-25PCN | 5 V supply, 25 ns access, 28-pin DIP - but lacks CE2 and automatic power-down | No hierarchical chip enable; higher standby current (35 mA vs. 20 mA) | Acceptable for simple single-bank systems where CE2 functionality and ultra-low ISB are not required |
Compared with IS61LV256AL-10TLI and AS6C4008-25PCN, the CY7C185-25PC uniquely combines 5 V operation, 28-pin DIP packaging, dual CE logic, and sub-25 mA standby current-making it irreplaceable for maintaining legacy 5 V industrial hardware with multi-bank memory maps.
Availability
CY7C185-25PC is available at Aetrix Electronics and suitable for industrial PLCs, avionics maintenance terminals, and legacy instrumentation requiring stable component supply across extended product lifecycles.
Supply support for CY7C185-25PC 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, PSoC, and USB solutions for industrial, automotive, and consumer markets.
The CY7C185 belongs to Cypress's legacy parallel SRAM product line, designed specifically for drop-in replacement of obsolete 27-series EPROMs and early-generation static RAMs in 5 V embedded control systems.
FAQ
What is the maximum clock frequency supported by CY7C185-25PC?
The CY7C185-25PC does not operate on a clock signal-it is an asynchronous SRAM. Its maximum usable read/write rate is determined by tRC (read cycle time) and tWC (write cycle time), both rated at 25 ns, supporting up to 40 MHz sustained random access in ideal conditions with proper address/data setup/hold timing.
Can CY7C185-25PC be used with a 3.3 V microcontroller?
No-CY7C185-25PC requires 5 V ±10% (4.5–5.5 V) for guaranteed operation and TTL-compatible signaling. Interfacing with 3.3 V logic requires level-shifting on all address, data, and control lines, which adds propagation delay and complexity; Cypress does not specify 3.3 V operation or mixed-voltage timing.
Does CY7C185-25PC support battery backup operation?
The device itself has no built-in battery-switching circuitry, but its low ISB1 (20 mA) and ISB2 (15 mA) currents allow integration into externally battery-backed systems. VCC must remain within specification during backup; Cypress recommends using external diode-OR and supercapacitor or lithium coin-cell circuits per application note AN1070.
Is the 28-pin DIP package RoHS-compliant?
Original CY7C185-25PC devices shipped prior to 2006 are leaded (non-RoHS). Aetrix Electronics supplies only RoHS-compliant, lead-free re-manufactured or sourced equivalents that meet J-STD-609 Category 1 marking and IPC-J-STD-020 moisture sensitivity level 3 requirements, with full material declarations available upon request.
CY7C185-25PC 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:
- 25ns
- Access Time:
- 25 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
CY7C185-25PC FAQ
1.How can I place an order for CY7C185-25PC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C185-25PC 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 CY7C185-25PC reliable?
The price and inventory of CY7C185-25PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C185-25PC is usually 5 days.
3.What payment methods are accepted for CY7C185-25PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C185-25PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C185-25PC?
CY7C185-25PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C185-25PC 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 CY7C185-25PC?
For technical support, including CY7C185-25PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C185-25PC requirements.
6.How does Aetrix verify that CY7C185-25PC is sourced from the original manufacturer or authorized distributors?
All CY7C185-25PC 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 CY7C185-25PC meets industry standards.
7.What is the process for return or replacement of CY7C185-25PC?
All CY7C185-25PC units undergo pre-shipment inspection (PSI). If there is an issue with CY7C185-25PC, 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 CY7C185-25PC part is unused and in its original packaging.
Return procedure for CY7C185-25PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CY7C185-25PC Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
