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Infineon Technologies CY7C199C-12VC
- Part No.:
- CY7C199C-12VC
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-BSOJ (0.300", 7.62mm Width)
- Datasheet:
-
CY7C199C-12VC.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28SOJ
- Quantity:
- Payment:
- Shipping:
Inventory:3,604
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Product details
Overview
CY7C199C-12VC from Cypress Semiconductor is a 256K-bit (32K × 8) asynchronous CMOS static RAM with 12 ns access time, TTL-compatible I/Os, and automatic CE-controlled power-down. It operates across 4.5V–5.5V, retains data at 2.0V, and supports industrial temperature range (–40°C to +85°C). Used in embedded controllers and legacy industrial systems requiring fast, low-power volatile memory.
For engineers reviewing the CY7C199C-12VC datasheet, CY7C199C-12VC pinout, CY7C199C-12VC application, or CY7C199C-12VC equivalent, key selection criteria include access time consistency, CE-driven standby current (10 µA), VCC tolerance, data retention voltage, and SOJ/TSOP/DIP package compatibility for board-level retrofitting.
Technical Context
The CY7C199C-12VC implements a full asynchronous SRAM interface with independent CE, OE, and WE controls-no clock required. Its internal logic enables three distinct read modes (CE/OE-controlled, CE/WE-controlled) and two write modes (WE- or CE-initiated), all validated by truth table and timing waveforms in Rev. *C datasheet.
Power management relies on dual-mode automatic power-down: ISB1 (30 µA, TTL input thresholds) and ISB2 (10 µA, CMOS thresholds) triggered by CE high, with guaranteed data retention down to 2.0V and recovery within 200 µs after reselection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8 bits - supports byte-wide data bus without external demultiplexing |
| Access Time (tAA) | 12 ns - ensures sub-83 MHz read throughput in synchronous bus interfaces |
| VCC Operating Range | 4.5V to 5.5V - compatible with legacy 5V TTL and mixed-signal systems |
| Data Retention Voltage | 2.0V - maintains stored contents during brown-out or backup battery operation |
| Standby Current (ISB2) | 10 µA - enables ultra-low-power hold mode when CE is deasserted |
| Input/Output Compatibility | TTL-compatible - interfaces directly with 74LS/74HC logic without level shifters |
| Operating Temperature | –40°C to +85°C - qualified for industrial control and automotive under-hood auxiliary modules |
Pinout & Package
Available in 28-pin SOJ (300-mil), 28-pin DIP, and 28-pin TSOP I packages. Pin functions are identical across packages; physical layout differs per mechanical drawing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Input | 15-bit address bus supporting full 32K-word addressing; no multiplexing required |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel data path with high-impedance tri-state control via OE/CE/WE |
| CE | Chip Enable | Primary device select; asserts power-down when high, enabling 10 µA ISB2 mode |
| OE | Output Enable | Controls output buffer only; does not affect power state or write capability |
| WE | Write Enable | Active-low write strobe; combined with CE LOW to initiate write cycle per timing spec tWC = 12 ns |
| VCC | Supply Voltage | 5.0V ±10% core supply; decoupling required per datasheet layout guidelines |
| VSS | Ground Reference | Common return for all signals and power; must be low-inductance connection |
Key Features
| Feature | Design Value |
|---|---|
| 12 ns Access Time | Guaranteed tAA ≤ 12 ns across full industrial temperature and voltage range-enables direct replacement in 8051/68K-based systems |
| Automatic CE Power-down | Reduces ICC from 85 mA to 10 µA without external control logic or sleep commands |
| 2.0V Data Retention | Maintains valid memory contents during VCC sag below operating range-critical for fail-safe logging |
| TTL-Compatible I/O | VIH = 2.2V min, VIL = 0.8V max-eliminates need for bus translators in legacy 5V designs |
| Pb-Free Packaging Option | RoHS-compliant SOJ/TSOP I variants available-supports industrial compliance without redesign |
Applications
| Industrial PLC Memory Buffer | Legacy Medical Device Data Cache |
|---|---|
Use Scenario: Real-time I/O scanning in programmable logic controllers where deterministic memory latency is critical for scan-cycle timing. IC Role / Device Role / Timing Role: Asynchronous SRAM providing zero-wait-state data buffering between CPU and fieldbus interface ASICs. Use Value: 12 ns tAA ensures memory access completes within one 8051 machine cycle at 12 MHz, preserving deterministic scan timing. | Use Scenario: Temporary waveform storage in portable ECG monitors during analog-to-digital conversion bursts. IC Role / Device Role / Timing Role: Volatile frame buffer holding 32K samples before compression and wireless transmission. Use Value: 2.0V data retention allows continued storage during brief battery switchover or low-VCC events. |
| Automotive Body Control Module | Avionics Display Refresh Buffer |
Use Scenario: Storing configuration parameters and sensor history logs in body control units exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Non-critical but reliable SRAM for EEPROM offload-reducing write cycles and wear. Use Value: –40°C to +85°C rating and 10 µA ISB2 ensure stable operation across vehicle thermal zones without active cooling. | Use Scenario: Frame buffer for monochrome cockpit displays requiring rapid pixel updates without GPU dependency. IC Role / Device Role / Timing Role: Byte-accessible memory mapped directly to display controller address space. Use Value: TTL-compatible I/O and 12 ns access enable direct interfacing with legacy display ASICs using 74-series glue logic. |
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, LVCMOS I/O | Requires data bus width adaptation and level shifting for 5V systems | Select only if migrating to 3.3V architecture and needing wider word size |
| ON Semiconductor MCM6295DW12 | 32K × 8, 5V, 12 ns, but no automatic power-down; ISB = 1 mA typical | Lacks CE-triggered low-power mode-requires external gating for standby reduction | Choose only for cost-sensitive replacements where power budget allows higher idle current |
Compared with IS61LV25616AL-12TQLI and MCM6295DW12, the CY7C199C-12VC uniquely delivers 5V TTL compatibility, 2.0V data retention, and sub-10 µA CE power-down in a pin-identical 28-pin footprint-making it irreplaceable in legacy 5V industrial retrofits.
Availability
CY7C199C-12VC is available at Aetrix Electronics and suitable for industrial PLCs, legacy medical devices, automotive body control modules, and avionics display systems requiring stable component supply and long-term obsolescence support.
Supply support for CY7C199C-12VC 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 communications markets.
The CY7C199C belongs to Cypress's legacy asynchronous SRAM product line, engineered specifically for drop-in replacement of obsolete 28-pin 5V SRAMs in systems where timing, voltage, and package compatibility are non-negotiable.
FAQ
Is CY7C199C-12VC RoHS compliant?
Yes. The CY7C199C-12VC is offered in both Pb-free (RoHS-compliant) and standard leaded versions. The Pb-free variant uses matte tin plating on SOJ and TSOP I packages, with full compliance documentation available upon request for industrial procurement audits.
What is the maximum junction temperature for continuous operation?
The absolute maximum junction temperature is +125°C, derived from the ambient operating limit of +85°C and ΘJA of 79°C/W (SOJ) or 88.6°C/W (TSOP I). Derating is required above 70°C ambient; full electrical specs are guaranteed only up to +85°C case temperature.
Can CY7C199C-12VC operate with CE and OE tied together?
Yes-CE and OE may be tied for simplified read-only operation, but this disables automatic power-down during reads. When both are asserted, the device remains active (ISB2 not engaged), drawing full operating current. For lowest power, keep OE controlled independently during reads and assert CE high when idle.
Does the 12 ns access time apply to both read and write cycles?
No. The 12 ns rating applies strictly to read access (tAA and tACE). Write cycle time (tWC) is also 12 ns, but write setup/hold requirements differ: tSD = 8 ns, tAW = 9 ns, and tHA = 0 ns. These values are independent and must be met simultaneously for reliable writes.
CY7C199C-12VC 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:
- 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-12VC FAQ
1.How can I place an order for CY7C199C-12VC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C199C-12VC 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-12VC reliable?
The price and inventory of CY7C199C-12VC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C199C-12VC is usually 5 days.
3.What payment methods are accepted for CY7C199C-12VC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C199C-12VC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C199C-12VC?
CY7C199C-12VC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C199C-12VC 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-12VC?
For technical support, including CY7C199C-12VC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C199C-12VC requirements.
6.How does Aetrix verify that CY7C199C-12VC is sourced from the original manufacturer or authorized distributors?
All CY7C199C-12VC 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-12VC meets industry standards.
7.What is the process for return or replacement of CY7C199C-12VC?
All CY7C199C-12VC units undergo pre-shipment inspection (PSI). If there is an issue with CY7C199C-12VC, 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-12VC part is unused and in its original packaging.
Return procedure for CY7C199C-12VC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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