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Infineon Technologies CY7C185-15VIT
- Part No.:
- CY7C185-15VIT
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-BSOJ (0.300", 7.62mm Width)
- Datasheet:
-
CY7C185-15VIT.pdf
- Description:
- IC SRAM 64KBIT PARALLEL 28SOJ
- Quantity:
- Payment:
- Shipping:
Inventory:4,693
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Product details
Overview
CY7C185-15VIT from Cypress Semiconductor is a 64-Kbit (8 K × 8) CMOS static RAM with 15 ns access time, 5 V ±10% supply, and automatic power-down reducing standby current to 15 mA. It features dual chip enables (CE1 active LOW, CE2 active HIGH), tri-state I/Os, TTL-compatible signaling, and is used in legacy industrial controllers requiring nonvolatile SRAM buffering with deterministic timing.
For engineers reviewing the CY7C185-15VIT datasheet, CY7C185-15VIT pinout, CY7C185-15VIT application, or CY7C185-15VIT equivalent, key selection criteria include tAA ≤15 ns read latency, ISB2 ≤15 mA standby current, CE1/CE2 enable logic compatibility, and 28-pin DIP/SOJ/SOIC package fit for through-hole or surface-mount PCB layouts.
Technical Context
The CY7C185-15VIT implements asynchronous parallel SRAM architecture with independent address decoding (A0–A12), bidirectional 8-bit data bus (I/O0–I/O7), and four control signals (CE1, CE2, OE, WE) enabling flexible memory expansion. Its dual CE scheme allows hierarchical chip selection in multi-bank systems without external logic.
Power management relies on automatic power-down triggered by CE1 HIGH or CE2 LOW, reducing ICC from 130 mA active to 15 mA standby (ISB2). All inputs and outputs meet TTL voltage thresholds (VIH ≥2.2 V, VIL ≤0.8 V), ensuring interoperability with legacy 5 V microcontroller buses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 64 Kbit (8 K × 8) - supports byte-wide data transfers without bit-slicing logic |
| Access Time (tAA) | 15 ns max - guarantees data valid within 15 ns of stable address, critical for 65 MHz CPU bus timing |
| Supply Voltage | 5 V ±10% - compatible with standard TTL/CMOS 5 V rails; no LDO required |
| Active Current (ICC) | 130 mA max - defines worst-case power rail sizing and thermal budget in continuous read/write operation |
| Standby Current (ISB2) | 15 mA max - enables low-power sleep modes when deselected via CE1/CE2 control |
| Input Capacitance | 7 pF - limits trace length and fanout on address/control lines in high-density layouts |
| Output Drive | IOL = 8 mA, IOH = –4 mA - sufficient to drive 10 TTL loads or 20 CMOS inputs directly |
Pinout & Package
Package: 28-pin (300-mil) molded DIP - through-hole mountable, RoHS-compliant Pb-free variant per ordering code suffix 'VIT'.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A12 | Address Inputs | 13-bit address bus selecting one of 8192 memory locations |
| I/O0–I/O7 | Bidirectional Data Bus | Tri-state I/O pins shared for read data output and write data input |
| CE1 | Chip Enable 1 | Active LOW enable; deassertion forces automatic power-down and high-impedance I/O |
| CE2 | Chip Enable 2 | Active HIGH enable; complements CE1 for hierarchical memory banking |
| OE | Output Enable | Active LOW control of data bus drivers; independent of WE state |
| WE | Write Enable | Active LOW signal initiating write cycle; must overlap with CE1 LOW and CE2 HIGH |
| VCC | Power Supply | +5 V supply pin; decoupling capacitor placement critical for noise immunity |
| GND | Ground Reference | Signal and power ground return; requires low-inductance connection to plane |
Key Features
| Feature | Design Value |
|---|---|
| Dual Chip Enable Logic | CE1 (active LOW) + CE2 (active HIGH) enables seamless expansion across multiple 8-Kbyte banks without glue logic |
| Automatic Power-Down | Reduces standby current to 15 mA when CE1 HIGH or CE2 LOW - eliminates need for external power gating |
| TTL-Compatible I/O | VIH ≥2.2 V, VIL ≤0.8 V ensures direct interface with 5 V microcontrollers and FPGAs without level shifters |
| Fast Output Enable | tDOE ≤8 ns - minimizes read latency in burst-access applications like display frame buffers |
| Alpha Particle Immunity | Die coat protection mitigates soft errors in industrial environments with elevated radiation exposure |
Applications
| Industrial PLC Memory Buffer | Legacy Medical Device Data Cache |
|---|---|
Use Scenario: Real-time I/O status storage in programmable logic controllers with 8051-based main CPU. IC Role / Device Role / Timing Role: Asynchronous byte-wide SRAM providing zero-wait-state data buffering between CPU and fieldbus interface ASIC. Use Value: 15 ns tAA ensures full-speed operation at 65 MHz bus clock; dual CE allows bank-switching for firmware/data partitioning. | Use Scenario: Temporary waveform storage in electrocardiogram (ECG) analyzers with analog front-end digitization. IC Role / Device Role / Timing Role: High-reliability SRAM holding raw ADC samples prior to DSP processing and flash storage. Use Value: Alpha-immune die coat prevents data corruption during long-term clinical deployment; 15 mA ISB2 extends battery runtime in portable units. |
| Avionics Sensor Interface Module | Test Equipment Pattern Memory |
Use Scenario: Sensor fusion preprocessing unit in flight control computers operating across –40 °C to +85 °C. IC Role / Device Role / Timing Role: Temperature-stable SRAM storing calibrated sensor coefficients and real-time correction tables. Use Value: Guaranteed operation over industrial temperature range; 7 pF input capacitance simplifies routing on multi-layer avionics PCBs. | Use Scenario: Digital pattern generator in automated test equipment requiring deterministic read/write timing. IC Role / Device Role / Timing Role: Fixed-latency memory delivering stimulus vectors to DUT with sub-ns jitter tolerance. Use Value: tLZOE ≤3 ns and tHZOE ≤7 ns ensure precise output enable timing control; 130 mA ICC supports high-throughput vector streaming. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AS6C8008-15TIN | Same 8 K × 8 organization, 15 ns access, but uses single active-LOW CE and lacks CE2; 3.3 V only | Requires level-shifting for 5 V systems; no hierarchical enable for multi-bank designs | Select only if migrating to 3.3 V platform and simplifying control logic |
| IS61LV25616AL-15TQLI | 16-bit bus (256 K × 16), 3.3 V core, 15 ns access; no 5 V tolerance or alpha immunity | Higher density but incompatible voltage and radiation hardening requirements | Use only in new 3.3 V designs where byte-width interface and radiation tolerance are not required |
Compared with AS6C8008-15TIN and IS61LV25616AL-15TQLI, the CY7C185-15VIT uniquely supports 5 V operation, dual CE expansion, and alpha immunity-making it irreplaceable in legacy industrial and avionics systems requiring drop-in compatibility and reliability under harsh conditions.
Availability
CY7C185-15VIT is available at Aetrix Electronics and suitable for industrial PLC memory buffers, legacy medical device data caches, and avionics sensor interface modules requiring stable component supply and long-lifecycle support.
Supply support for CY7C185-15VIT 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) designs high-reliability memory and programmable solutions for industrial, automotive, and aerospace applications.
The CY7C185 belongs to Cypress's legacy parallel SRAM product line, engineered for deterministic timing, 5 V compatibility, and robust operation in mission-critical embedded systems.
FAQ
Is CY7C185-15VIT compatible with 3.3 V systems?
No. The CY7C185-15VIT is specified only for 5 V ±10% operation (4.5 V to 5.5 V). Its input thresholds (VIH ≥2.2 V, VIL ≤0.8 V) and output drive strength assume 5 V rails. Interfacing with 3.3 V logic requires level-shifting circuitry to prevent damage or undefined behavior.
What is the function of CE2 being active HIGH?
CE2's active-HIGH logic enables complementary chip selection with CE1 (active LOW), allowing hierarchical memory mapping. For example, CE1 can select a memory bank while CE2 selects a sub-bank within it-eliminating external AND gates in multi-SRAM systems and simplifying address decoding.
Does CY7C185-15VIT support battery backup operation?
No. The CY7C185-15VIT lacks built-in battery-switchover circuitry or NVSRAM functionality. It is a volatile SRAM requiring continuous VCC to retain data. External battery-backed power supplies or external nonvolatile storage must be implemented for data retention during power loss.
Can I use OE and WE simultaneously active for read-modify-write cycles?
No. OE and WE serve mutually exclusive functions: OE controls output drivers (read), WE controls write latching. Asserting both simultaneously violates the truth table and may cause bus contention or undefined data states. Read-modify-write must be sequenced as read → process → write with proper timing margins per tRC and tWC.
CY7C185-15VIT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 28-BSOJ (0.300", 7.62mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
CY7C185-15VIT FAQ
1.How can I place an order for CY7C185-15VIT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C185-15VIT 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 CY7C185-15VIT reliable?
The price and inventory of CY7C185-15VIT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C185-15VIT is usually 5 days.
3.What payment methods are accepted for CY7C185-15VIT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C185-15VIT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C185-15VIT?
CY7C185-15VIT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C185-15VIT 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 CY7C185-15VIT?
For technical support, including CY7C185-15VIT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C185-15VIT requirements.
6.How does Aetrix verify that CY7C185-15VIT is sourced from the original manufacturer or authorized distributors?
All CY7C185-15VIT 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 CY7C185-15VIT meets industry standards.
7.What is the process for return or replacement of CY7C185-15VIT?
All CY7C185-15VIT units undergo pre-shipment inspection (PSI). If there is an issue with CY7C185-15VIT, 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 CY7C185-15VIT part is unused and in its original packaging.
Return procedure for CY7C185-15VIT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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