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Infineon Technologies CY7C199CN-12VXAT
- Part No.:
- CY7C199CN-12VXAT
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-BSOJ (0.300", 7.62mm Width)
- Datasheet:
-
CY7C199CN-12VXAT.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28SOJ
- Quantity:
- Payment:
- Shipping:
Inventory:3,338
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Product details
Overview
CY7C199CN-12VXAT from Cypress Semiconductor is a 256K-bit (32K × 8) asynchronous CMOS static RAM with 12 ns access time, 5.0 V ±10% supply voltage, TTL-compatible I/O, and automatic CE-controlled power-down mode. It operates across commercial temperature range (0°C to 70°C) and supports high-speed memory interfacing in microcontroller-based systems requiring deterministic read/write timing.
For engineers reviewing the CY7C199CN-12VXAT datasheet, CY7C199CN-12VXAT pinout, CY7C199CN-12VXAT application, or CY7C199CN-12VXAT equivalent, key selection criteria include access time consistency under CE/OE/WE control, low standby current (≤500 µA), data retention at 2.0 V, and compatibility with legacy 28-pin DIP/SOJ/TSOP I footprints.
Technical Context
The CY7C199CN-12VXAT implements a fully asynchronous SRAM architecture with independent address decoding, sense amplifier array, and bidirectional I/O buffers. Its operation relies on three active-low control signals-CE, OE, and WE-to manage chip select, output enable, and write enable states without clock dependency.
Power management is handled via dual-mode automatic power-down: ISB1 (TTL-input compatible, ≤30 mA) activates when CE ≥ VIH and inputs are valid; ISB2 (CMOS-input optimized, ≤10 µA) engages when CE ≥ VCC – 0.3 V and all inputs are near rail. Data retention remains guaranteed down to VCC = 2.0 V with ICCDR ≤ 150 µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8 bits - provides byte-wide data bus interface with 15 address lines (A0–A14) |
| Access Time (tAA) | 12 ns - guarantees data validity within 12 ns after stable address assertion, critical for tight CPU wait-state timing |
| Supply Voltage | 4.5 V to 5.5 V - supports standard 5 V logic rails with ±10% tolerance, compatible with legacy industrial power supplies |
| Standby Current (ISB2) | ≤500 µA - enables ultra-low-power hold mode during system sleep, reducing idle power by >99% vs active mode |
| Data Retention Voltage | 2.0 V - maintains stored data integrity during brown-out or backup-battery operation without refresh |
| Operating Temperature | 0°C to 70°C - validated for commercial-grade embedded systems including instrumentation and peripheral controllers |
| I/O Compatibility | TTL input thresholds / 4 mA drive - ensures direct interfacing with 5 V microcontrollers and FPGAs without level-shifting |
Pinout & Package
Package: 28-pin TSOP I (8 mm × 13.4 mm), RoHS-compliant, lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Input | 15-bit address bus - selects one of 32,768 memory locations; A0 is LSB, A14 is MSB |
| IO0–IO7 | Input/Output | 8-bit bidirectional data bus - transfers data during read (output) or write (input) cycles |
| CE | Control | Chip Enable - active-low signal enabling memory access; drives device into ISB2 standby when high |
| OE | Control | Output Enable - active-low control of data bus drivers; places IOx in high-Z when disabled |
| WE | Control | Write Enable - active-low signal initiating write cycle; latches data on falling edge when CE is asserted |
| VCC | Supply | +5.0 V core power - must be decoupled locally; powers internal logic and I/O buffers |
| VSS | Supply | Ground reference - common return path for all internal circuits and I/O signals |
Key Features
| Feature | Design Value |
|---|---|
| 12 ns access time with full address-to-data timing | Enables zero-wait-state operation with 80 MHz CPU interfaces using standard 5 V timing margins |
| Automatic CE-driven power-down (ISB2) | Reduces standby current to ≤500 µA without external control logic or sleep-mode firmware overhead |
| 2.0 V data retention capability | Preserves memory contents during undervoltage events or battery-backed hold modes without external supervision |
| TTL-compatible I/O with 4 mA drive strength | Direct connection to legacy 5 V microcontrollers (e.g., 8051, PIC18F) without buffer ICs or resistive termination |
| Pb-free 28-pin TSOP I package | Meets RoHS requirements while maintaining mechanical and thermal compatibility with existing PCB layouts |
Applications
| Industrial PLC I/O Modules | Legacy Microcontroller Systems |
|---|---|
Use Scenario: Buffering real-time sensor data and control commands between fieldbus interface and main controller. IC Role / Device Role / Timing Role: Asynchronous SRAM providing non-blocking read/write access for deterministic scan-cycle execution. Use Value: 12 ns access time eliminates CPU wait states; 2.0 V retention ensures data persistence during brief AC line dips. | Use Scenario: Expanding data memory for 8-bit MCUs with limited on-chip RAM (e.g., 8051 derivatives). IC Role / Device Role / Timing Role: Byte-wide external memory mapped into MCU address space using dedicated address/data bus. Use Value: TTL-compatible I/O and 5 V operation allow plug-in replacement of older NMOS SRAMs without redesign. |
| Medical Diagnostic Equipment | Test & Measurement Instruments |
Use Scenario: Storing waveform capture buffers and calibration coefficients in portable ultrasound units. IC Role / Device Role / Timing Role: High-reliability data storage element supporting burst-mode acquisition and offline analysis. Use Value: Low standby current (<500 µA) extends battery life; wide temp range (0°C–70°C) accommodates clinical environment variations. | Use Scenario: Holding digitized sample buffers and instrument configuration tables in benchtop oscilloscopes. IC Role / Device Role / Timing Role: Fast-access memory for real-time sampling engines requiring sub-20 ns read latency. Use Value: 12 ns tAA and tRC ensure accurate timestamp alignment between ADC samples and memory writes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar asynchronous SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AS6C4008-12TIN | Same 32K × 8 organization, 12 ns access, but uses 2.7–3.6 V supply only | Requires level-shifting or separate 3.3 V rail; incompatible with 5 V-only systems | Select only if migrating to lower-voltage platform with compatible I/O standards |
| IS61LV25616AL-12TQLI | 16-bit bus (256K × 16), 12 ns, 3.3 V supply, different pinout and control logic | Not pin-compatible; requires PCB redesign and address/data bus re-mapping | Choose for higher bandwidth needs where 16-bit data path justifies layout change |
Compared with AS6C4008-12TIN and IS61LV25616AL-12TQLI, the CY7C199CN-12VXAT uniquely supports 5 V operation with TTL compatibility and 28-pin TSOP I footprint-making it the only drop-in replacement for legacy 5 V designs requiring no voltage translation or board revision.
Availability
CY7C199CN-12VXAT is available at Aetrix Electronics and suitable for industrial PLC I/O modules, legacy microcontroller systems, and medical diagnostic equipment requiring stable component supply and long-term obsolescence support.
Supply support for CY7C199CN-12VXAT 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, automotive, and consumer markets.
The CY7C199CN belongs to Cypress's legacy asynchronous SRAM product line, designed specifically for cost-sensitive, high-reliability 5 V embedded systems needing deterministic timing and long-lifecycle availability.
FAQ
Is CY7C199CN-12VXAT compatible with 3.3 V systems?
No. The CY7C199CN-12VXAT is specified for 4.5 V to 5.5 V operation only. Its input thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V) and output drive (VOH ≥ 2.4 V at –4 mA) are optimized for 5 V TTL logic. Interfacing with 3.3 V controllers requires level-shifting circuitry to prevent overvoltage damage and ensure reliable signal recognition.
What happens to data during power-down mode?
When CE is deasserted (high), the device enters automatic power-down mode with ISB2 current ≤500 µA. Data remains fully retained as long as VCC stays ≥2.0 V. No external refresh or backup power is needed-the SRAM cells maintain state indefinitely under these conditions, verified per data sheet Note 8 and Table "Data Retention Characteristics".
Can OE and WE be tied together for simplified control?
No. OE controls output driver enablement (affects IOx high-Z state), while WE controls write latching. Tying them violates timing requirements: tHZOE (5–9 ns) and tHZWE (7–10 ns) differ, and simultaneous transitions may cause bus contention or metastability. The truth table explicitly defines separate functional roles-combining signals risks undefined data bus behavior during read-modify-write sequences.
Does CY7C199CN-12VXAT support battery backup operation?
Yes-explicitly designed for this use case. At VCC = 2.0 V, the device retains data with ICCDR ≤150 µA and tCDR = 0 ns (immediate entry to retention mode upon CE deassertion). This allows direct connection to coin-cell batteries or supercapacitors without additional supervisory ICs, as confirmed in the "Data Retention Characteristics" section (Page 6, Note 8).
CY7C199CN-12VXAT 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:
- 256Kbit
- Memory Organization:
- 32K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 12ns
- Access Time:
- 12 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
CY7C199CN-12VXAT FAQ
1.How can I place an order for CY7C199CN-12VXAT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C199CN-12VXAT 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 CY7C199CN-12VXAT reliable?
The price and inventory of CY7C199CN-12VXAT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C199CN-12VXAT is usually 5 days.
3.What payment methods are accepted for CY7C199CN-12VXAT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C199CN-12VXAT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C199CN-12VXAT?
CY7C199CN-12VXAT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C199CN-12VXAT 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 CY7C199CN-12VXAT?
For technical support, including CY7C199CN-12VXAT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C199CN-12VXAT requirements.
6.How does Aetrix verify that CY7C199CN-12VXAT is sourced from the original manufacturer or authorized distributors?
All CY7C199CN-12VXAT 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 CY7C199CN-12VXAT meets industry standards.
7.What is the process for return or replacement of CY7C199CN-12VXAT?
All CY7C199CN-12VXAT units undergo pre-shipment inspection (PSI). If there is an issue with CY7C199CN-12VXAT, 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 CY7C199CN-12VXAT part is unused and in its original packaging.
Return procedure for CY7C199CN-12VXAT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CY7C199CN-12VXAT Tags
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