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Infineon Technologies CY7C199CNL-15VXI
- Part No.:
- CY7C199CNL-15VXI
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-BSOJ (0.300", 7.62mm Width)
- Datasheet:
-
CY7C199CNL-15VXI.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28SOJ
- Quantity:
- Payment:
- Shipping:
Inventory:2,177
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Product details
Overview
CY7C199CNL-15VXI from Cypress Semiconductor is a 256-Kbit (32 K × 8) asynchronous CMOS static RAM with 15 ns access time, 5.0 V ±10% supply range, and automatic CE-controlled power-down. It operates across industrial temperature (–40 °C to +85 °C), supports TTL-compatible I/O, and retains data at 2.0 V-used in legacy industrial controllers requiring nonvolatile memory backup during brownout.
For engineers reviewing the CY7C199CNL-15VXI datasheet, CY7C199CNL-15VXI pinout, CY7C199CNL-15VXI application, or CY7C199CNL-15VXI equivalent, key selection criteria include access timing consistency under varying VCC, standby current below 500 pA, CE-driven power-state control, and SOJ-28 package compatibility with through-hole and surface-mount board layouts.
Technical Context
This SRAM implements a fully asynchronous interface with independent CE, OE, and WE controls enabling precise read/write gating. Its internal architecture includes row/column decoders, sense amplifiers, and a dedicated power-down circuit triggered solely by CE high, eliminating external logic for low-power states.
The device uses standard CMOS process technology with TTL-compatible input thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V) and output drive capability (IOH = –4 mA, IOL = 8 mA). Data retention at 2.0 V is guaranteed with ICCDR ≤ 150 pA, supporting battery-backed hold modes without external regulators.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 256 Kbit (32 K × 8) - supports byte-wide data bus interfacing without multiplexing |
| Access time (tAA) | 15 ns - ensures reliable operation up to 66.7 MHz read cycle rate |
| Supply voltage | 4.5 V to 5.5 V - compatible with legacy 5 V logic rails and noise margin requirements |
| Standby current (ISB2) | 500 pA max - enables multi-year data retention on coin-cell backup |
| Data retention voltage | 2.0 V min - allows operation during deep brownout or capacitor hold-down |
| Operating temperature | –40 °C to +85 °C - qualified for industrial control and instrumentation environments |
| Output drive | 8 mA sink / 4 mA source - directly interfaces with 74LS/TTL loads without buffers |
Pinout & Package
Package: 28-pin Small Outline J-lead (SOJ), lead-free, RoHS-compliant, body width 300 mil.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address input | 15-bit address bus accepting full 32K address space; no internal latching |
| IO0–IO7 | Bidirectional data I/O | True bidirectional bus pins with 3-state control via OE/CE; no separate DQ/DQ̅ |
| CE | Chip enable | Active-low primary select; forces automatic power-down and high-Z I/O when high |
| OE | Output enable | Active-low read gate; outputs enabled only when CE and OE both low |
| WE | Write enable | Active-low write strobe; initiates write on falling edge with CE low |
| VCC | Power supply | 5 V core supply; decoupling required within 10 mm of pin 28 |
| VSS | Ground | Signal and power ground reference; connected to pin 14 for SOJ layout symmetry |
Key Features
| Feature | Design Value |
|---|---|
| Automatic CE power-down | Reduces ICC to ≤500 pA without external control logic or sleep mode registers |
| TTL-compatible I/O | Eliminates level-shifting components when interfacing with 74LS, 74F, or microcontroller GPIO |
| 2.0 V data retention | Enables seamless transition to backup power without data loss during main supply interruption |
| 15 ns access time | Meets timing closure for 8051, Z80, and 68000-based systems running at ≤66 MHz bus clocks |
| SOJ-28 and DIP-28 options | Supports both automated SMT assembly and hand-soldered prototyping or field repair |
Applications
| Industrial PLC Memory Buffer | Legacy Microcontroller Data RAM |
|---|---|
Use Scenario: Real-time I/O scanning in programmable logic controllers where power interruptions occur during factory maintenance. IC Role / Device Role / Timing Role: Asynchronous byte-wide scratchpad RAM holding process state during brief AC dropout. Use Value: 2.0 V data retention ensures zero-cycle recovery after 200 ms brownout; 15 ns access sustains 10 kHz scan loop timing. | Use Scenario: External RAM expansion for Z80-based medical diagnostic equipment with fixed 8-bit data bus. IC Role / Device Role / Timing Role: Non-multiplexed parallel memory mapped at 0x8000–0xFFFF, accessed via WAIT signal generation. Use Value: TTL-compatible inputs eliminate bus transceivers; SOJ-28 footprint matches legacy PCB tooling. |
| Avionics Sensor Data Cache | Test Equipment Firmware Storage |
Use Scenario: Storing calibrated sensor coefficients in airborne inertial measurement units exposed to –40 °C cold-soak. IC Role / Device Role / Timing Role: Static storage for lookup tables accessed during boot and periodic recalibration routines. Use Value: Industrial temp grade (–40 °C to +85 °C) and 500 pA ISB2 ensure stable retention over 10-year service life. | Use Scenario: Holding firmware images in automated test handlers where reprogramming occurs infrequently but reliability is critical. IC Role / Device Role / Timing Role: Read-only execution memory during self-test sequences, deselected between operations. Use Value: CE-driven power-down cuts leakage to sub-nA levels, preventing thermal drift in precision analog subsystems. |
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 | 4 Mbit (512 K × 8), 15 ns, 3.3 V only, SOJ-28 | Higher density but incompatible voltage; requires level shifters in 5 V systems | Select only if upgrading capacity and migrating to 3.3 V infrastructure |
| IS61LV25616AL-15TQLI | 4 Mbit (256 K × 16), 15 ns, 3.3 V, TQFP-44 | Wider bus, different package, no 5 V support; not drop-in replaceable | Choose for new 3.3 V designs needing higher bandwidth, not for CY7C199CNL-15VXI replacement |
Compared with AS6C4008-15TIN and IS61LV25616AL-15TQLI, the CY7C199CNL-15VXI remains uniquely suited for 5 V industrial retrofits due to its voltage compatibility, SOJ-28 pinout, and proven 2.0 V data retention-neither alternative replicates this exact combination of legacy interface, power behavior, and form factor.
Availability
CY7C199CNL-15VXI is available at Aetrix Electronics and suitable for industrial PLC memory buffers, legacy microcontroller data RAM, avionics sensor data caches, and test equipment firmware storage requiring stable component supply across extended product lifecycles.
Supply support for CY7C199CNL-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) designs high-reliability memory and programmable solutions for industrial, automotive, and communications systems, with emphasis on long-lifecycle support and robust qualification.
The CY7C199CN series belongs to Cypress's legacy asynchronous SRAM portfolio, engineered specifically for 5 V systems requiring deterministic timing, low standby power, and drop-in compatibility with classic microprocessor buses.
FAQ
Is CY7C199CNL-15VXI pin-compatible with CY7C199DN-15VXI?
Yes-both share identical SOJ-28 pinout, address/data mapping, and control signal assignments. The 'L' suffix denotes lead-free packaging; electrical and timing specifications are functionally identical per datasheet Rev. *J. No PCB layout changes are needed for substitution.
What is the maximum clock frequency supported for read cycles?
The device does not use a clock; it is asynchronous. Maximum effective read throughput is determined by tRC = 15 ns, yielding a theoretical upper limit of 66.7 MHz for consecutive reads. Actual system speed depends on address setup/hold and bus controller timing margins.
Can CY7C199CNL-15VXI operate reliably at 4.5 V?
Yes-its specified VCC range is 4.5 V to 5.5 V. At 4.5 V, all AC parameters including tAA (15 ns) and tRC (15 ns) remain guaranteed per datasheet Table on page 8, and DC characteristics such as VIH (2.2 V min) maintain valid noise margins.
Does the automatic power-down feature require external circuitry?
No-power-down activates automatically when CE is driven high, reducing ICC to ≤500 pA without any external components, configuration registers, or software intervention. This behavior is inherent to the silicon design and verified across temperature and voltage ranges.
CY7C199CNL-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
CY7C199CNL-15VXI FAQ
1.How can I place an order for CY7C199CNL-15VXI through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C199CNL-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 CY7C199CNL-15VXI reliable?
The price and inventory of CY7C199CNL-15VXI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C199CNL-15VXI is usually 5 days.
3.What payment methods are accepted for CY7C199CNL-15VXI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C199CNL-15VXI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C199CNL-15VXI?
CY7C199CNL-15VXI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C199CNL-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 CY7C199CNL-15VXI?
For technical support, including CY7C199CNL-15VXI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C199CNL-15VXI requirements.
6.How does Aetrix verify that CY7C199CNL-15VXI is sourced from the original manufacturer or authorized distributors?
All CY7C199CNL-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 CY7C199CNL-15VXI meets industry standards.
7.What is the process for return or replacement of CY7C199CNL-15VXI?
All CY7C199CNL-15VXI units undergo pre-shipment inspection (PSI). If there is an issue with CY7C199CNL-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 CY7C199CNL-15VXI part is unused and in its original packaging.
Return procedure for CY7C199CNL-15VXI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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