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Infineon Technologies CY7C199-35PC
- Part No.:
- CY7C199-35PC
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-DIP (0.300", 7.62mm)
- Datasheet:
-
CY7C199-35PC.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,727
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Product details
Overview
CY7C199-35PC from Cypress Semiconductor is a 32K × 8 (262,144-bit) CMOS static RAM with 35 ns maximum access time, TTL-compatible I/O, and active-low CE/OE/WE control logic. It operates at 5V ±10%, supports automatic power-down when deselected (reducing standby current to 10 mA max), and is packaged in a 28-pin 300-mil DIP for through-hole mounting in legacy industrial controllers and instrumentation systems.
For engineers reviewing the CY7C199-35PC datasheet, CY7C199-35PC pinout, CY7C199-35PC application, or CY7C199-35PC equivalent, key selection criteria include tRC = 35 ns read cycle time, ISB2 = 10 mA CMOS standby current, VCC = 5V operation, and compatibility with 15-bit address buses (A0–A14) and 8-bit bidirectional data buses (I/O0–I/O7).
Technical Context
The CY7C199-35PC implements a synchronous, non-volatile-retentive SRAM array organized as 32,768 words × 8 bits, using full CMOS circuitry with three-state output drivers. Its dual enable architecture-CE (chip enable) and OE (output enable)-enables seamless memory expansion in multi-chip systems without external gating logic.
Write operations are controlled exclusively by the WE (write enable) signal in conjunction with CE; OE remains inactive (HIGH) during writes. Read operations require CE and OE both LOW while WE is HIGH, placing addressed data on I/O pins with tDOE = 16 ns propagation delay and tHZOE = 15 ns high-impedance recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8 (262,144 bits), requiring A0–A14 address lines and 8 bidirectional data lines |
| Max Access Time (tAA) | 35 ns - defines minimum clock period for reliable read timing in synchronous bus interfaces |
| Read Cycle Time (tRC) | 35 ns - sets maximum sustained read throughput of ~28.6 MHz in continuous access mode |
| Standby Current (ISB2) | 10 mA max (CMOS inputs) - enables low-power hold state when CE is deasserted and system is idle |
| VCC Operating Range | 5V ±10% (4.5V–5.5V) - compatible with standard TTL/CMOS logic supply rails |
| Input/Output Voltage Levels | VIH = 2.2V min, VOL = 0.4V max - ensures robust noise margin against TTL-level signals |
| Capacitance | CIN/COUT = 8 pF max - limits trace loading and preserves signal integrity on 50-MHz-class buses |
Pinout & Package
Package: 28-pin 300-mil plastic Dual In-line Package (DIP), through-hole mount, JEDEC MS-001 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus supporting 32K-word addressing; no internal latching |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit tristatable I/O lines; high-impedance when CE or OE is HIGH |
| CE̅ | Chip Enable (active LOW) | Primary chip select; initiates automatic power-down when HIGH (ISB2 = 10 mA) |
| OE̅ | Output Enable (active LOW) | Controls output driver enable; must be LOW with CE̅ for read data assertion |
| WE̅ | Write Enable (active LOW) | Controls write latch; LOW with CE̅ enables write; HIGH with CE̅/OE̅ enables read |
| VCC | Power Supply | +5V supply pin (Pin 28); decoupling capacitor required within 10 mm |
| GND | Ground | Reference ground (Pin 14); must be low-inductance connection to minimize noise |
Key Features
| Feature | Design Value |
|---|---|
| Automatic CE Power-Down | Reduces ICC to 10 mA max when CE̅ is HIGH, cutting active power by >80% during idle cycles |
| TTL-Compatible I/O | Accepts 0.8V/2.0V logic thresholds and drives 4mA/8mA loads - interoperable with 74LS and microcontroller GPIO |
| Three-State Output Drivers | Prevents bus contention in shared-data systems; high-Z state activated by CE̅ or OE̅ HIGH |
| Easy Memory Expansion | Dedicated CE̅ and OE̅ allow daisy-chained or parallel decoding without glue logic |
| Die Coat Protection | Enhanced alpha particle immunity - suitable for industrial environments with elevated radiation exposure |
Applications
| Industrial PLC Data Buffers | Legacy Test Equipment Memory |
|---|---|
Use Scenario: Storing real-time sensor acquisition buffers and program stack in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Primary volatile data storage with deterministic 35 ns read latency and CE-controlled power gating between scan cycles. Use Value: Enables deterministic 28.6 MHz burst reads for high-speed I/O scanning while maintaining <10 mA standby draw during idle polling intervals. | Use Scenario: Holding calibration tables and waveform capture buffers in benchtop oscilloscopes and logic analyzers manufactured pre-2005. IC Role / Device Role / Timing Role: Non-critical, non-volatile-retentive RAM for firmware-adjacent data storage with direct microcontroller bus interface. Use Value: Matches legacy 5V bus timing and drive strength requirements without level-shifting, simplifying redesign of discontinued instruments. |
| Avionics Maintenance Terminals | Medical Imaging Control Boards |
Use Scenario: Supporting diagnostic boot loaders and configuration registers in FAA-certified portable maintenance aids (PMAs). IC Role / Device Role / Timing Role: Static RAM for secure, non-modifiable configuration storage during aircraft ground checks. Use Value: Qualified for –55°C to +125°C operation with MIL-grade reliability testing and die coat radiation hardening. | Use Scenario: Buffering image frame metadata and motion compensation parameters in ultrasound and X-ray controller boards. IC Role / Device Role / Timing Role: Low-latency scratchpad memory interfaced directly to 8051 or Z80 derivatives via dedicated address/data bus. Use Value: Guarantees tAA ≤ 35 ns and tHZOE ≤ 15 ns - critical for synchronizing DMA transfers with analog front-end sampling clocks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar static RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AS6C4008-35PCN | 35 ns access, 5V, 32K × 8, but uses different pinout (A0–A14 on opposite side) and lacks die coat | Not drop-in replaceable due to address pin reordering; requires PCB layout revision | Choose only if board redesign is feasible and radiation immunity is not required |
| IS61LV25616AL-10TLI | 10 ns access, 3.3V-only, 256K × 16 organization - incompatible voltage and density | Requires level shifters and bus width adaptation; unsuitable for direct replacement | Select only for new designs targeting higher speed and lower voltage, not for CY7C199-35PC migration |
Compared with AS6C4008-35PCN and IS61LV25616AL-10TLI, the CY7C199-35PC uniquely delivers 5V TTL compatibility, proven radiation tolerance, and pin-for-pin fit in legacy DIP-based systems - making it irreplaceable where form-factor and qualification continuity are mandatory.
Availability
CY7C199-35PC is available at Aetrix Electronics and suitable for industrial PLC data buffering, legacy test equipment memory upgrades, avionics maintenance terminals, and medical imaging control boards requiring stable component supply across extended product lifecycles.
Supply support for CY7C199-35PC 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) is a U.S.-based semiconductor company founded in 1982, specializing in memory, microcontrollers, and programmable logic solutions for industrial and automotive markets.
The CY7C199 belongs to Cypress's legacy parallel SRAM product line, designed specifically for pin-compatible replacement of obsolete 28-pin DIP memories in long-lifecycle industrial and aerospace systems requiring guaranteed 5V operation and MIL-qualified reliability.
FAQ
Is CY7C199-35PC compatible with 3.3V systems?
No. The CY7C199-35PC is specified only for 5V ±10% operation (4.5V–5.5V). Its input thresholds (VIH = 2.2V min) and output drive strength are optimized for TTL/5V CMOS logic families. Interfacing with 3.3V controllers requires level-shifting circuitry and violates absolute maximum ratings if VCC < 4.5V.
Does CY7C199-35PC support battery backup or data retention below 5V?
No - only the "L" speed variants (e.g., CY7C199-35L) specify 2.0V data retention. The -35PC suffix denotes the commercial-grade, plastic DIP package without low-voltage retention capability. Standard -35PC operation requires continuous 5V supply; data loss occurs immediately upon VCC dropout.
What is the meaning of "automatic power-down" in CY7C199-35PC?
Automatic power-down is triggered when CE̅ is driven HIGH, disabling internal circuitry and reducing supply current from ~140 mA (active) to 10 mA (standby). This feature is inherent to the device architecture and requires no external control signals or configuration - it activates solely based on CE̅ logic state.
Can CY7C199-35PC be used in place of CY7C199-25PC?
Yes, as a functional downgrade: the -35PC meets all timing specifications of the -25PC except access time (35 ns vs. 25 ns). System timing margins must be re-verified, especially for tRC and tDOE. Pinout, voltage, and logic behavior are identical; no hardware changes are needed beyond timing validation.
CY7C199-35PC 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:
- 35ns
- Access Time:
- 35 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
CY7C199-35PC FAQ
1.How can I place an order for CY7C199-35PC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C199-35PC 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 CY7C199-35PC reliable?
The price and inventory of CY7C199-35PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C199-35PC is usually 5 days.
3.What payment methods are accepted for CY7C199-35PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C199-35PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C199-35PC?
CY7C199-35PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C199-35PC 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 CY7C199-35PC?
For technical support, including CY7C199-35PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C199-35PC requirements.
6.How does Aetrix verify that CY7C199-35PC is sourced from the original manufacturer or authorized distributors?
All CY7C199-35PC 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 CY7C199-35PC meets industry standards.
7.What is the process for return or replacement of CY7C199-35PC?
All CY7C199-35PC units undergo pre-shipment inspection (PSI). If there is an issue with CY7C199-35PC, 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 CY7C199-35PC part is unused and in its original packaging.
Return procedure for CY7C199-35PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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