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Infineon Technologies CY7C199C-15VXI
- Part No.:
- CY7C199C-15VXI
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-BSOJ (0.300", 7.62mm Width)
- Datasheet:
-
CY7C199C-15VXI.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28SOJ
- Quantity:
- Payment:
- Shipping:
Inventory:3,186
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Product details
Overview
CY7C199C-15VXI from Cypress Semiconductor is a 256K (32K × 8) asynchronous CMOS static RAM with 15 ns access time, 5.0V ±10% supply range, TTL-compatible I/Os, automatic CE-controlled power-down, and 2.0V data retention. It operates across industrial temperature (–40°C to +85°C) and is packaged in 28-pin SOJ for embedded memory buffering in legacy microcontroller systems.
For engineers reviewing the CY7C199C-15VXI datasheet, CY7C199C-15VXI pinout, CY7C199C-15VXI application, or CY7C199C-15VXI equivalent, key selection criteria include access time consistency under CE/OE/WE timing control, low standby current (≤500 µA), industrial-grade thermal performance (ΘJA = 79°C/W), and compatibility with 5V TTL bus interfaces in space-constrained SOJ layouts.
Technical Context
The CY7C199C-15VXI implements a fully asynchronous SRAM architecture with independent address decoding, sense amplifier array, and tri-state I/O buffers. Its CE-driven power-down logic reduces ICC to ≤10 µA when chip enable is deasserted, while OE and WE jointly govern read/write transitions without internal clocks or synchronization circuits.
All timing parameters-including tAA (15 ns), tACE (15 ns), tDOE (7 ns), and tHZOE (7 ns)-are specified at VCC = 4.5V–5.5V and TA = –40°C to +85°C, with guaranteed data hold (tOHA = 3 ns) and write pulse width (tPWE = 9 ns) supporting reliable interfacing to 8-bit microprocessors like Intel 8085 or Zilog Z80 derivatives.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8 bits - supports byte-wide data bus with no external multiplexing required |
| Access Time (tAA) | 15 ns - enables direct interface with 25 MHz CPU buses without wait states |
| Supply Voltage | 4.5V to 5.5V - ensures interoperability with legacy 5V TTL logic families |
| Standby Current (ISB2) | ≤500 µA - maintains low power during idle cycles in battery-backed systems |
| Data Retention Voltage | 2.0V - allows memory contents to persist during brown-out conditions down to 2V supply |
| Operating Temperature | –40°C to +85°C - qualified for industrial control and automotive under-hood applications |
| Input Capacitance | 8 pF - minimizes signal loading on address/data lines in high-density PCB layouts |
Pinout & Package
Package: 28-pin Small Outline J-Lead (SOJ), body size 11.4 mm × 10.2 mm, lead pitch 1.27 mm, JEDEC MO-025AC compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Input | 15-bit address bus accepting full 32K address space; latched on CE/WE transitions |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit TTL-compatible data path; high-impedance when OE = VIH or CE = VIH |
| CE | Chip Enable | Active-low primary selection signal; triggers automatic power-down when high |
| OE | Output Enable | Active-low control for output buffer; overrides WE during reads to prevent bus contention |
| WE | Write Enable | Active-low write strobe; initiates write cycle only when CE = LOW and OE = HIGH |
| VCC | Power Supply | +5.0V ±10% core supply; decoupling capacitor required within 10 mm of pin 28 |
| VSS | Ground | Signal and power return reference; must be connected to low-impedance ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Automatic CE Power-down | Reduces ICC to ≤10 µA when CE is deasserted-eliminates need for external sleep controllers |
| TTL-Compatible I/O | VIH = 2.2V min, VOL = 0.4V max at 8 mA-ensures direct connection to 5V microprocessor buses |
| 2.0V Data Retention | Maintains stored data during brown-out or backup-battery operation without refresh |
| Industrial Temperature Range | Validated operation from –40°C to +85°C-supports deployment in motor drives and PLC modules |
| Multiple Package Options | SOJ (Z28), DIP (P21), TSOP I (Z28)-enables drop-in replacement across legacy board revisions |
Applications
| Industrial PLC Memory Buffer | Legacy Microcontroller Data RAM |
|---|---|
Use Scenario: Real-time I/O scanning in programmable logic controllers where deterministic memory access latency is critical. IC Role / Device Role / Timing Role: Asynchronous SRAM providing non-blocking 8-bit data storage for scan-cycle variables and register mapping. Use Value: 15 ns tAA and 3 ns tOHA guarantee sub-20 ns read turnaround, enabling 50 kHz scan rates without CPU wait states. | Use Scenario: External RAM expansion for 8-bit microcontrollers (e.g., Z80, 8085) in test equipment and instrumentation. IC Role / Device Role / Timing Role: Byte-addressable memory mapped into CPU address space via dedicated address latch and CE decoding logic. Use Value: TTL-compatible inputs/outputs eliminate level-shifting components; SOJ package fits compact Eurocard layouts. |
| Automotive Engine Control Module | Medical Diagnostic Device Cache |
Use Scenario: Storing transient sensor calibration tables and fault logs in engine control units operating under wide ambient swings. IC Role / Device Role / Timing Role: Non-volatile-retentive SRAM holding critical runtime data during ignition cycling and voltage dips. Use Value: 2.0V data retention preserves EEPROM-like reliability without wear-out limitations or write latency penalties. | Use Scenario: High-integrity temporary storage for waveform capture buffers in portable ECG and EEG analyzers. IC Role / Device Role / Timing Role: Low-power, fast-access memory staging analog-to-digital conversion results before DMA transfer to host processor. Use Value: ≤500 µA ISB2 and 79°C/W ΘJA allow continuous operation in sealed enclosures without active cooling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar asynchronous SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AS6C4008-15TIN | 15 ns access, 32K × 8, 2.7V–3.6V supply only | Requires level-shifting for 5V systems; lower power but incompatible voltage domain | Select only if migrating to 3.3V architecture and redesigning power delivery |
| IS61LV25616AL-15TQLI | 15 ns, 256K × 16, 3.3V supply, 44-pin TSOP II | Doubles data width and requires PCB layout change; not pin-compatible | Choose when upgrading bandwidth and accepting footprint revision for future-proofing |
Compared with AS6C4008-15TIN and IS61LV25616AL-15TQLI, the CY7C199C-15VXI uniquely supports 5V TTL interfacing and SOJ packaging in legacy designs-making it irreplaceable where voltage compatibility and mechanical fit are non-negotiable constraints.
Availability
CY7C199C-15VXI is available at Aetrix Electronics and suitable for industrial PLC memory buffering, legacy microcontroller data RAM expansion, and automotive engine control module design requiring stable component supply across extended product lifecycles.
Supply support for CY7C199C-15VXI 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 applications.
The CY7C199C belongs to Cypress's legacy asynchronous SRAM product line, designed specifically for drop-in replacement of obsolete 28-pin 5V SRAMs in cost-sensitive, long-lifecycle industrial systems.
FAQ
What is the maximum clock frequency supported by CY7C199C-15VXI?
The CY7C199C-15VXI is an asynchronous SRAM and does not use a clock signal. Its maximum effective interface speed is determined by access time (15 ns) and cycle time (tRC = 15 ns), allowing reliable operation with microprocessors running up to ~25 MHz bus frequencies when timing margins are observed.
Does CY7C199C-15VXI support battery backup operation?
Yes-CY7C199C-15VXI guarantees data retention down to VCC = 2.0V with ISB2 ≤ 10 µA, enabling seamless transition to backup battery power during main supply failure without external circuitry or refresh.
Can CY7C199C-15VXI be used with 3.3V microcontrollers?
No-its input thresholds (VIH ≥ 2.2V, VIL ≤ 0.8V) and output drive (VOH ≥ 2.4V at –4 mA) are specified only for 5.0V ±10% operation. Interfacing with 3.3V logic requires level translation to avoid marginal or non-compliant signaling.
Is lead-free packaging available for CY7C199C-15VXI?
Yes-the CY7C199C-15VXI is offered in lead-free 28-pin DIP per manufacturer documentation, though the -15VXI suffix specifically denotes the industrial-grade 28-pin SOJ variant with standard SnPb finish. Lead-free SOJ variants exist under different ordering codes (e.g., -15VXIT).
CY7C199C-15VXI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 28-BSOJ (0.300", 7.62mm Width)
- Packaging:
- Tube
- 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:
- 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
CY7C199C-15VXI FAQ
1.How can I place an order for CY7C199C-15VXI through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C199C-15VXI 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 CY7C199C-15VXI reliable?
The price and inventory of CY7C199C-15VXI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C199C-15VXI is usually 5 days.
3.What payment methods are accepted for CY7C199C-15VXI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C199C-15VXI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C199C-15VXI?
CY7C199C-15VXI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C199C-15VXI 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 CY7C199C-15VXI?
For technical support, including CY7C199C-15VXI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C199C-15VXI requirements.
6.How does Aetrix verify that CY7C199C-15VXI is sourced from the original manufacturer or authorized distributors?
All CY7C199C-15VXI 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 CY7C199C-15VXI meets industry standards.
7.What is the process for return or replacement of CY7C199C-15VXI?
All CY7C199C-15VXI units undergo pre-shipment inspection (PSI). If there is an issue with CY7C199C-15VXI, 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 CY7C199C-15VXI part is unused and in its original packaging.
Return procedure for CY7C199C-15VXI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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