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Infineon Technologies CY7C199C-15PC
- Part No.:
- CY7C199C-15PC
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-DIP (0.300", 7.62mm)
- Datasheet:
-
CY7C199C-15PC.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,036
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Product details
Overview
CY7C199C-15PC from Cypress Semiconductor is a 256K-bit (32K × 8) asynchronous CMOS static RAM with 15 ns access time, TTL-compatible I/Os, 5.0V ±10% supply operation, and automatic CE-controlled power-down. It delivers low standby current (10 µA in CMOS mode), 2.0V data retention, and supports industrial temperature range (–40°C to +85°C). Used in embedded controllers and legacy industrial systems requiring non-volatile data hold during sleep.
For engineers reviewing the CY7C199C-15PC datasheet, CY7C199C-15PC pinout, CY7C199C-15PC application, or CY7C199C-15PC equivalent, key selection criteria include access time consistency across VCC variation, CE-driven power-down timing (tPD = 15 ns), I/O capacitance (8 pF), and compatibility with 28-pin SOJ/DIP/TSOP I footprints in space-constrained PCB layouts.
Technical Context
The CY7C199C-15PC implements a full asynchronous SRAM interface with independent CE, OE, and WE controls enabling three distinct read/write modes: OE-controlled reads, WE-controlled writes, and CE-controlled writes. Its internal logic ensures data integrity during overlapping CE/WE transitions, with write termination triggered by either signal going HIGH.
It features dual power-down states: ISB1 (30 µA, TTL input thresholds) and ISB2 (10 µA, CMOS thresholds), selected automatically based on input voltage levels. Data retention at 2.0V is supported only in L-version devices, confirmed for this part per datasheet Rev. *C, Page 6.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8 bits - provides byte-wide data bus interface without external multiplexing |
| Access Time (tAA) | 15 ns - guarantees valid data output within 15 ns after address stabilization under VCC = 4.5–5.5V |
| Supply Voltage Range | 4.5V to 5.5V - supports legacy 5V systems with ±10% tolerance, no level-shifting required |
| Standby Current (ISB2) | 10 µA - enables ultra-low-power sleep mode when CE ≥ VCC – 0.3V and inputs biased to rail |
| Data Retention Voltage | 2.0V - maintains stored data during brown-out or backup battery operation down to 2.0V |
| I/O Capacitance | 8 pF - limits signal rise/fall time impact on high-speed bus loading in multi-device configurations |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade deployment without derating |
Pinout & Package
Available in 28-pin SOJ (300-mil), 28-pin DIP, and 28-pin TSOP I packages. Pin functions are identical across packages with mechanical layout variations only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Input | 15-bit address bus supporting full 32K-word addressing; no internal multiplexing |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel data path; high-impedance when OE = VIH or CE = VIH |
| CE | Chip Enable | Primary device select; initiates automatic power-down when HIGH (ISB1/ISB2 active) |
| OE | Output Enable | Controls output buffer only; does not affect internal power state or write capability |
| WE | Write Enable | Active-LOW write strobe; write cycle initiated only when CE and WE both LOW |
| VCC | Power Supply | +5.0V core supply; must be stable within ±10% for guaranteed AC timing compliance |
| VSS | Ground | Reference return for all signals and power; requires low-inductance connection to minimize noise coupling |
Key Features
| Feature | Design Value |
|---|---|
| Automatic CE Power-down | Reduces ICC to 10 µA (ISB2) without external control logic or sleep-mode software overhead |
| TTL-Compatible I/Os | Eliminates level translators in mixed-logic 5V systems; VIH = 2.2V min, VIL = 0.8V max |
| 2.0V Data Retention | Preserves memory contents during main supply interruption, enabling fast wake-up from backup power |
| Three Read/Write Modes | Supports OE-controlled reads, WE-controlled writes, and CE-controlled writes - increases system timing flexibility |
| Pb-Free Packaging Option | Meets RoHS Directive 2011/65/EU; available in both Pb-free and standard SOJ/DIP/TSOP I variants |
Applications
| Industrial PLC Memory Buffer | Legacy Medical Device Data Cache |
|---|---|
Use Scenario: Real-time I/O scanning in programmable logic controllers where deterministic memory access 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: 15 ns tAA ensures sub-20 ns response to address changes, meeting <25 ns PLC scan jitter budgets without clock domain bridging. | Use Scenario: Temporary waveform storage in ECG monitors during analog-to-digital conversion bursts before host MCU transfer. IC Role / Device Role / Timing Role: Byte-accessible scratchpad memory holding 32 KB of sampled sensor data prior to USB or UART upload. Use Value: 2.0V data retention allows uninterrupted storage during brief 5V rail dips caused by motor actuation in portable units. |
| Avionics Display Frame Buffer | Test Equipment Pattern Generator |
Use Scenario: Storing rasterized display frames in ruggedized cockpit displays operating across –40°C to +85°C ambient. IC Role / Device Role / Timing Role: Non-cached frame buffer interfacing directly to graphics controller with asynchronous handshaking. Use Value: Industrial temp rating and 8 pF I/O capacitance prevent timing skew or bus contention at 5 MHz pixel clock rates. | Use Scenario: Holding digital stimulus patterns in automated test equipment generating repetitive 8-bit parallel waveforms. IC Role / Device Role / Timing Role: Static pattern store accessed via FPGA address sequencer with precise WE/CE edge alignment. Use Value: CE/WE overlap timing control (tSCE = 10 ns) enables reliable write capture without external setup/hold logic. |
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, 2.7–3.6V supply only - no 5V support | Requires level-shifting in legacy 5V systems; unsuitable for direct replacement | Select only if migrating to 3.3V architecture with redesign of power and I/O rails |
| IS61LV25616AL-15TQLI | 15 ns, 256K × 16, 3.3V supply, LVCMOS I/O - wider bus, different voltage | Provides double data width but incompatible VCC and logic thresholds; needs bus-width adaptation | Choose when upgrading to 16-bit data path and 3.3V system; not drop-in compatible |
Compared with AS6C4008-15TIN and IS61LV25616AL-15TQLI, the CY7C199C-15PC uniquely supports 5V operation with TTL-compatible thresholds and industrial temperature range in a pin-compatible 28-pin footprint - essential for maintaining legacy system form factor and electrical interface integrity.
Availability
CY7C199C-15PC is available at Aetrix Electronics and suitable for industrial PLC memory buffers, legacy medical device data caches, and avionics display frame buffers requiring stable component supply across extended product lifecycles.
Supply support for CY7C199C-15PC 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, with headquarters in San Jose, CA.
The CY7C199C belongs to Cypress's legacy asynchronous SRAM product line, engineered specifically for 5V industrial systems needing deterministic timing, low-power sleep, and long-term obsolescence resilience without architectural migration.
FAQ
What is the minimum VCC required to maintain data during retention mode?
The CY7C199C-15PC guarantees data retention down to 2.0V on VCC, as specified in the Data Retention Characteristics table (Page 6, Rev. *C). At this voltage, ICCDR remains ≤150 µA, and no external refresh or clock is needed. Operation below 2.0V risks data loss, and retention time is indefinite as long as VCC ≥ 2.0V and CE remains asserted.
Does CY7C199C-15PC support true bidirectional I/O without external direction control?
Yes - the I/O0–I/O7 pins are internally managed bidirectional data lines. Direction is controlled solely by OE and WE states: outputs enabled when CE = LOW, OE = LOW, and WE = HIGH; inputs latched when CE = LOW and WE = LOW. No external transceiver or direction pin is required, simplifying PCB routing and reducing component count.
How does automatic power-down behave when CE is held HIGH but OE and WE are floating?
When CE is HIGH, the device enters ISB1 or ISB2 power-down regardless of OE/WE state. However, floating OE/WE pins may violate the VIN specification (–0.5V to VCC + 0.5V) and cause excessive leakage or latch-up. Cypress specifies that for guaranteed ISB2 (10 µA), inputs must be actively biased to VCC – 0.3V or 0.3V - not left floating.
Can CY7C199C-15PC be used in place of CY7C199-15PC?
Yes - the "C" suffix denotes the commercial/industrial grade version with identical timing, pinout, and DC characteristics as the base CY7C199-15PC. Per datasheet Rev. *C, the CY7C199C supersedes earlier versions and adds explicit support for industrial temperature range (–40°C to +85°C) and Pb-free packaging options while maintaining full functional and mechanical compatibility.
CY7C199C-15PC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 28-DIP (0.300", 7.62mm)
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 28-PDIP
CY7C199C-15PC FAQ
1.How can I place an order for CY7C199C-15PC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C199C-15PC 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-15PC reliable?
The price and inventory of CY7C199C-15PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C199C-15PC is usually 5 days.
3.What payment methods are accepted for CY7C199C-15PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C199C-15PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C199C-15PC?
CY7C199C-15PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C199C-15PC 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-15PC?
For technical support, including CY7C199C-15PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C199C-15PC requirements.
6.How does Aetrix verify that CY7C199C-15PC is sourced from the original manufacturer or authorized distributors?
All CY7C199C-15PC 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-15PC meets industry standards.
7.What is the process for return or replacement of CY7C199C-15PC?
All CY7C199C-15PC units undergo pre-shipment inspection (PSI). If there is an issue with CY7C199C-15PC, 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-15PC part is unused and in its original packaging.
Return procedure for CY7C199C-15PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CY7C199C-15PC Tags
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AT24C02C-XHM-T
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