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Infineon Technologies CY7C199C-12VXCT
- Part No.:
- CY7C199C-12VXCT
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-BSOJ (0.300", 7.62mm Width)
- Datasheet:
-
CY7C199C-12VXCT.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28SOJ
- Quantity:
- Payment:
- Shipping:
Inventory:2,153
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Product details
Overview
CY7C199C-12VXCT from Cypress Semiconductor is a 256K-bit (32K × 8) asynchronous CMOS static RAM with 12 ns access time, 5.0V ±10% supply operation, and automatic CE-controlled power-down. It serves as a high-speed, low-power data buffer or working memory in embedded controllers, industrial PLCs, and legacy communication interface cards requiring TTL-compatible I/O and reliable 2.0V data retention.
For engineers reviewing the CY7C199C-12VXCT datasheet, CY7C199C-12VXCT pinout, CY7C199C-12VXCT application, or CY7C199C-12VXCT equivalent, key selection criteria include verified 12 ns tAA/tRC timing, CMOS standby current ≤10 µA under VCC–0.3V CE disable, and SOJ-28 package compatibility with legacy board layouts.
Technical Context
The CY7C199C-12VXCT implements a fully asynchronous SRAM architecture with independent address decoding, sense amplifier array, and tri-state I/O buffers controlled by CE, OE, and WE. Its read/write cycle timing is governed by overlapping CE and WE assertion, with no internal clock or synchronization logic.
Power management relies on dual-mode automatic power-down: ISB1 (30 µA) for TTL-level CE disable and ISB2 (10 µA) for CMOS-level CE disable, both validated at f = 0 MHz and VCC = max. Data retention at 2.0V is guaranteed with ICCDR ≤150 µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8 bits - supports byte-wide data bus without external demultiplexing |
| Access Time (tAA / tRC) | 12 ns - enables direct interfacing with 8051, Z80, and 68K-family microcontrollers at full speed |
| Supply Voltage Range | 4.5V to 5.5V - compatible with standard 5V TTL/CMOS logic rails and legacy power supplies |
| Standby Current (ISB2) | 10 µA at VCC–0.3V CE disable - reduces system idle power in battery-backed or energy-sensitive applications |
| Data Retention Voltage | 2.0V - maintains stored data during brown-out or controlled low-power sleep modes |
| Input/Output Compatibility | TTL-compatible VIH/VIL and VOH/VOL - eliminates level-shifting requirements in mixed-logic systems |
| Package Type | 28-pin SOJ (300-mil) - matches footprint of industry-standard 28-pin SRAM sockets and PCB land patterns |
Pinout & Package
Package: 28-pin Small Outline J-Lead (SOJ), 300-mil width, JEDEC MS-012AC compliant. Pin 1 marked by notch or dot; leads bent downward for through-hole or surface-mount soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Input | 15-bit address bus supporting 32K-word addressing; A0 least significant bit |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel data path; high-impedance when CE=HIGH or OE=HIGH during reads |
| CE | Chip Enable | Active-low primary device select; initiates automatic power-down when deasserted |
| OE | Output Enable | Active-low read control; disables output drivers without affecting internal state |
| WE | Write Enable | Active-low write strobe; controls data latching into memory array with CE |
| VCC | Power Supply | +5.0V ±10% core supply; decoupling capacitor required at Pin 28 per layout guidelines |
| VSS | Ground | Signal and power return reference; connected to Pin 14 for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| 12 ns access time | Meets real-time response requirements for 8-bit microcontroller-based instrumentation and motor control loops |
| Automatic CE power-down | Reduces active standby current to 10 µA without external control logic or firmware intervention |
| 2.0V data retention | Preserves RAM contents during main supply interruption, enabling fast wake-up from low-power states |
| TTL-compatible I/O | Direct connection to legacy 5V microprocessor buses without level translators or pull-up resistors |
| Pb-free and RoHS-compliant option | Supports environmental compliance for industrial and medical equipment without redesigning PCB layout |
Applications
| Industrial PLC Memory Buffer | Legacy Communication Interface Card |
|---|---|
Use Scenario: Storing real-time I/O status and configuration registers in programmable logic controllers operating in harsh environments. IC Role / Device Role / Timing Role: Asynchronous byte-wide scratchpad memory interfaced directly to Motorola 68HC11 CPU bus. Use Value: 12 ns tAA ensures deterministic response within 1 µs scan cycles; 10 µA ISB2 minimizes thermal load in sealed enclosures. | Use Scenario: Holding protocol translation tables and packet buffers in RS-485/RS-232 converter modules with FPGA glue logic. IC Role / Device Role / Timing Role: Non-volatile-cached working memory accessed via discrete address decode and CE/OE/WE control lines. Use Value: TTL-compatible I/O eliminates level shifters; 2.0V data retention preserves last-known state during hot-swap events. |
| Embedded Test Equipment FIFO | Avionics Data Logger Buffer |
Use Scenario: Capturing sensor samples at 100 kHz in handheld multimeters and calibration tools with limited PCB area. IC Role / Device Role / Timing Role: High-speed temporary storage between ADC interface and SPI flash controller. Use Value: SOJ-28 footprint fits compact designs; 12 ns access enables single-cycle CPU reads without wait states. | Use Scenario: Buffering flight parameter telemetry before compression and transmission in certified airborne data acquisition units. IC Role / Device Role / Timing Role: Radiation-tolerant (per design heritage) volatile memory for transient mission-critical data staging. Use Value: –40°C to +85°C industrial temp range meets DO-160 Section 22 requirements; 2.0V retention sustains data across power glitches. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar asynchronous SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISSI IS61LV25616AL-12TQLI | 32K × 16 organization, 3.3V-only supply, 12 ns access, TSOP-44 package | Requires data bus width adaptation and voltage translation; not drop-in for 8-bit systems | Select only if migrating to 16-bit data path and 3.3V infrastructure |
| ON Semiconductor MCM6295DW12 | 32K × 8, 5V, 12 ns, DIP-28 package; no automatic power-down; higher ISB = 5 mA | Matches pinout and function but lacks low-power mode; suitable for non-battery systems | Prefer when board space allows DIP socket and standby current >5 mA is acceptable |
Compared with IS61LV25616AL-12TQLI and MCM6295DW12, the CY7C199C-12VXCT uniquely delivers 8-bit bus compatibility, 5V tolerance, and sub-10 µA standby in a legacy SOJ-28 footprint-critical for cost-sensitive, long-lifecycle industrial retrofits.
Availability
CY7C199C-12VXCT is available at Aetrix Electronics and suitable for industrial PLCs, legacy communication interface cards, embedded test equipment, and avionics data loggers requiring stable component supply and long-term obsolescence management.
Supply support for CY7C199C-12VXCT 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 logic solutions for industrial, automotive, and communications markets.
The CY7C199C belongs to Cypress's legacy asynchronous SRAM product line, engineered specifically for pin-compatible replacement of aging 28-pin 5V SRAMs in mission-critical embedded systems with strict timing and power constraints.
FAQ
What is the maximum operating temperature range for CY7C199C-12VXCT?
The CY7C199C-12VXCT is rated for industrial temperature operation from –40°C to +85°C. This range is validated per the device's DC and AC electrical specifications in the official datasheet (Document #: 38-05408 Rev. *C), and applies to all package variants including the SOJ-28 version. No derating is required within this span.
Does CY7C199C-12VXCT support true static operation without refresh?
Yes. The CY7C199C-12VXCT is a true asynchronous static RAM with no internal refresh circuitry required. Data remains valid indefinitely as long as VCC is maintained within specification and CE is asserted during access. Its architecture uses six-transistor memory cells, eliminating periodic refresh cycles inherent in DRAM devices.
Can CY7C199C-12VXCT be used with 3.3V logic interfaces?
No. The CY7C199C-12VXCT requires a 4.5V–5.5V VCC supply and is specified only for TTL-compatible input thresholds (VIH ≥ 2.2V, VIL ≤ 0.8V). Driving its inputs from 3.3V logic may result in marginal VIH margin and undefined behavior. A level translator or 5V-compatible buffer is required for safe interfacing.
Is Pb-free packaging available for CY7C199C-12VXCT?
Yes. Cypress offered both Pb-free (RoHS-compliant) and traditional SnPb finish variants of the CY7C199C-12VXCT in SOJ-28 packaging. The "-12VXCT" suffix denotes the Pb-free version; the non-Pb-free variant carries the "-12VXC" suffix. Both share identical electrical and thermal specifications.
CY7C199C-12VXCT 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOJ
CY7C199C-12VXCT FAQ
1.How can I place an order for CY7C199C-12VXCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C199C-12VXCT 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-12VXCT reliable?
The price and inventory of CY7C199C-12VXCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C199C-12VXCT is usually 5 days.
3.What payment methods are accepted for CY7C199C-12VXCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C199C-12VXCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C199C-12VXCT?
CY7C199C-12VXCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C199C-12VXCT 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-12VXCT?
For technical support, including CY7C199C-12VXCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C199C-12VXCT requirements.
6.How does Aetrix verify that CY7C199C-12VXCT is sourced from the original manufacturer or authorized distributors?
All CY7C199C-12VXCT 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-12VXCT meets industry standards.
7.What is the process for return or replacement of CY7C199C-12VXCT?
All CY7C199C-12VXCT units undergo pre-shipment inspection (PSI). If there is an issue with CY7C199C-12VXCT, 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-12VXCT part is unused and in its original packaging.
Return procedure for CY7C199C-12VXCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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