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Cypress Semiconductor Corp CY7C199CN-20ZXI
- Part No.:
- CY7C199CN-20ZXI
- Manufacturer:
- Cypress Semiconductor Corp
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
CY7C199CN-20ZXI.pdf
- Description:
- IC SRAM 256KBIT PAR 28TSOP I
- Quantity:
- Payment:
- Shipping:
Inventory:1,361
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Product details
Overview
CY7C199CN-20ZXI from Cypress Semiconductor is a 256K-bit (32K × 8) asynchronous CMOS static RAM with 20 ns access time, 5.0V ±10% supply operation, and automatic CE-controlled power-down mode. It supports TTL-compatible I/O, retains data down to 2.0V, and is packaged in Pb-free 28-pin TSOP I for space-constrained embedded memory buffering in industrial controllers.
For engineers reviewing the CY7C199CN-20ZXI datasheet, CY7C199CN-20ZXI pinout, CY7C199CN-20ZXI application, or CY7C199CN-20ZXI equivalent, key selection criteria include access time consistency across temperature, low standby current (500 µA), data retention voltage margin, and compatibility with legacy 28-pin SRAM footprints in real-time control systems.
Technical Context
The CY7C199CN-20ZXI implements a fully asynchronous interface with independent CE, OE, and WE controls enabling flexible read/write sequencing. Its internal architecture includes row/column decoders, sense amplifiers, and an automated power-down circuit triggered by CE high, reducing ICC to ≤500 µA without external logic.
It operates across industrial temperature (–40°C to +85°C) at 4.5V–5.5V, delivering guaranteed tAA = 20 ns and tRC = 20 ns under worst-case conditions. Input thresholds (VIH ≥ 2.2V, VIL ≤ 0.8V) and output drive (VOH ≥ 2.4V at –4 mA, VOL ≤ 0.4V at 8 mA) ensure robust interfacing with 5V TTL and CMOS microcontrollers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8 bits - provides byte-wide data bus alignment for 8-bit microcontrollers and peripherals. |
| Access Time (tAA) | 20 ns - ensures deterministic read latency in real-time interrupt service routines. |
| Supply Voltage | 4.5V to 5.5V - supports stable operation across noisy industrial power rails with ±10% tolerance. |
| Standby Current (ISB2) | 500 µA at VCC = 5.5V - enables low-power hold mode during processor sleep without external gating. |
| Data Retention Voltage | 2.0V - allows memory state preservation during brown-out events or battery-backed operation. |
| Operating Temperature | –40°C to +85°C - qualified for deployment in industrial automation and motor control enclosures. |
| Package | 28-pin TSOP I (8 × 13.4 mm) - surface-mount compatible with standard reflow profiles and PCB area constraints. |
Pinout & Package
Package: 28-pin Thin Small Outline Package Type I (TSOP I), Pb-free, 8 mm × 13.4 mm body, 0.55 mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Input | 15-bit address bus - selects one of 32K locations; A0 is LSB, A14 is MSB. |
| IO0–IO7 | Input/Output | 8-bit bidirectional data bus - shares pins for read and write; high-impedance when disabled. |
| CE | Control | Chip Enable - active-low; forces device into low-power ISB2 mode (500 µA) when high. |
| OE | Control | Output Enable - active-low; gates output drivers only; does not affect power state. |
| WE | Control | Write Enable - active-low; initiates write cycle when CE and WE both low; latches data on falling edge. |
| VCC | Supply | +5.0V core supply - must be decoupled locally; tolerates 4.5V–5.5V per spec. |
| VSS | Supply | Ground reference - dedicated pin (Pin 21) minimizes noise coupling in high-speed reads. |
Key Features
| Feature | Design Value |
|---|---|
| Automated CE Power Down | Reduces ICC to 500 µA without external control logic or clock gating - simplifies low-power system design. |
| TTL-Compatible I/O | Accepts standard 5V TTL input levels (VIH ≥ 2.2V, VIL ≤ 0.8V) and drives 4 mA high / 8 mA low - eliminates level-shifter requirements. |
| 2.0V Data Retention | Maintains stored data during undervoltage events down to 2.0V - supports graceful shutdown and backup power transitions. |
| Low Capacitance I/O | Input/output capacitance ≤ 8 pF - minimizes signal distortion and timing skew on dense PCB traces. |
| Industrial Temp Range | Rated for –40°C to +85°C ambient - validated for continuous operation in unventilated control cabinets and motor drive environments. |
Applications
| PLC I/O Module Buffering | Industrial HMI Display Memory |
|---|---|
|
Use Scenario: Storing real-time sensor register snapshots and actuator command queues in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Asynchronous byte-wide SRAM providing zero-wait-state read/write access for deterministic scan-cycle execution. Use Value: 20 ns tAA ensures full 32K buffer access within single 100 µs PLC scan period; CE power-down cuts background current during idle cycles. |
Use Scenario: Holding GUI frame buffers and font glyph tables in human-machine interface panels with ARM9-based display controllers. IC Role / Device Role / Timing Role: Non-volatile-retentive memory supporting rapid pixel updates while maintaining state during backlight dimming intervals. Use Value: 2.0V data retention preserves display content during brief 5V rail dips; TSOP I footprint matches layout standards for compact front-panel PCBs. |
| Motor Drive Firmware Cache | Legacy Instrumentation Data Logging |
|
Use Scenario: Caching PID coefficient sets and encoder position history in servo drive firmware for adaptive tuning loops. IC Role / Device Role / Timing Role: Low-latency scratchpad memory accessed directly by DSP cores via parallel bus without wait states. Use Value: 5.0V ±10% operation tolerates switching regulator ripple; 8 pF I/O capacitance prevents timing violations at 50 MHz bus toggle rates. |
Use Scenario: Capturing analog-to-digital conversion results in portable test equipment with battery-backed operation. IC Role / Device Role / Timing Role: Standalone memory buffer isolating ADC interface from host MCU, enabling burst capture and delayed upload. Use Value: 500 µA ISB2 current extends battery life during logging pauses; industrial temp rating ensures reliability in field-deployed units. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar asynchronous SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AS6C4008-20TIN | Same 32K × 8 organization, 20 ns access, but uses 2.7V–3.6V supply - incompatible with 5V systems. | Requires level translation or separate 3.3V rail; unsuitable for direct 5V TTL replacement. | Select only if migrating to lower-voltage platform with redesign of power and I/O interfaces. |
| IS61LV25616AL-20TQLI | 32K × 8, 20 ns, 3.3V core, but offers 16-bit bus option and higher speed grades; pinout differs (32-pin TSOP). | Not pin-compatible; requires PCB redesign and may over-specify for simple byte-wide buffering needs. | Consider only when future scalability to wider data paths or lower voltage is planned. |
Compared with AS6C4008-20TIN and IS61LV25616AL-20TQLI, the CY7C199CN-20ZXI uniquely delivers verified 5V TTL compatibility, industrial temperature support, and true drop-in replacement capability in existing 28-pin TSOP I layouts - critical for sustaining legacy industrial designs.
Availability
CY7C199CN-20ZXI is available at Aetrix Electronics and suitable for PLC I/O modules, industrial HMIs, motor drive firmware caches, and legacy instrumentation data logging requiring stable component supply and long-term obsolescence management.
Supply support for CY7C199CN-20ZXI 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 embedded systems, with headquarters in San Jose, CA.
The CY7C199CN belongs to Cypress's legacy asynchronous SRAM product line, engineered specifically for deterministic, low-latency memory interfacing in 5V microcontroller and DSP-based control systems.
FAQ
Is CY7C199CN-20ZXI RoHS compliant and Pb-free?
Yes. The "X" suffix in -20ZXI denotes Pb-free construction per JEDEC J-STD-609, confirmed in Cypress Document #001-06435 Rev. *B. The TSOP I package uses matte tin terminations and complies with EU RoHS Directive 2011/65/EU and China RoHS.
What is the maximum operating frequency supported by CY7C199CN-20ZXI?
The device has no clock input and operates asynchronously. Its maximum effective throughput is governed by tRC = 20 ns, yielding up to 50 MHz sustained read/write cycling. Timing is controlled solely by CE, OE, and WE signal edges per the truth table on page 3 of the datasheet.
Can CY7C199CN-20ZXI interface directly with a 3.3V microcontroller?
No. Its inputs require VIH ≥ 2.2V but are rated for 5V operation only; driving from 3.3V logic violates the minimum VIH specification under worst-case VCC = 4.5V. A level translator or 5V-tolerant MCU I/O is required for reliable operation.
Does the automatic power-down feature require external circuitry to activate?
No. Power-down is fully automatic: asserting CE high (≥ VCC – 0.3V) immediately places the device in ISB2 mode (≤500 µA), regardless of OE or WE state. No external timer, enable signal, or configuration register is needed.
CY7C199CN-20ZXI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Cypress Semiconductor Corp
- Series:
- -
- Package/Case:
- 28-TSSOP (0.465", 11.80mm Width)
- Packaging:
- Bulk
- 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:
- 20ns
- Access Time:
- 20 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSOP I
CY7C199CN-20ZXI FAQ
1.How can I place an order for CY7C199CN-20ZXI through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C199CN-20ZXI 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 CY7C199CN-20ZXI reliable?
The price and inventory of CY7C199CN-20ZXI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C199CN-20ZXI is usually 5 days.
3.What payment methods are accepted for CY7C199CN-20ZXI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C199CN-20ZXI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C199CN-20ZXI?
CY7C199CN-20ZXI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C199CN-20ZXI 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 CY7C199CN-20ZXI?
For technical support, including CY7C199CN-20ZXI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C199CN-20ZXI requirements.
6.How does Aetrix verify that CY7C199CN-20ZXI is sourced from the original manufacturer or authorized distributors?
All CY7C199CN-20ZXI 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 CY7C199CN-20ZXI meets industry standards.
7.What is the process for return or replacement of CY7C199CN-20ZXI?
All CY7C199CN-20ZXI units undergo pre-shipment inspection (PSI). If there is an issue with CY7C199CN-20ZXI, 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 CY7C199CN-20ZXI part is unused and in its original packaging.
Return procedure for CY7C199CN-20ZXI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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