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Infineon Technologies CY7C199CN-15PXC
- Part No.:
- CY7C199CN-15PXC
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-DIP (0.300", 7.62mm)
- Datasheet:
-
CY7C199CN-15PXC.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,259
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Product details
Overview
CY7C199CN-15PXC 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 commercial temperature range (0 °C to 70 °C), supports TTL-compatible I/O, and retains data at 2.0 V-used in legacy industrial controllers requiring nonvolatile SRAM backup during brownout.
For engineers reviewing the CY7C199CN-15PXC datasheet, CY7C199CN-15PXC pinout, CY7C199CN-15PXC application, or CY7C199CN-15PXC equivalent, key selection criteria include access timing consistency under 5 V operation, low standby current (≤500 pA), CE-gated power management, and DIP-28 footprint compatibility for through-hole board retrofits.
Technical Context
This SRAM implements a fully asynchronous interface with independent address latch, write enable (WE), output enable (OE), and chip enable (CE) controls. Read and write cycles are defined by overlapping CE/WE/OE states per the truth table, with no internal clock or synchronization logic.
Power management relies on CE-driven automatic transition into low-power retention mode when deasserted, reducing ICC to ≤500 pA at VCC = 5.0 V. Data retention remains valid down to VCC = 2.0 V, enabling battery-backed hold functionality without external supervision circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 256 Kbit (32 K × 8), fixed parallel organization for byte-wide data bus interfacing |
| Access time | 15 ns max-guarantees read data validity within 15 ns after stable address and CE/OE assertion |
| Supply voltage | 4.5 V to 5.5 V-supports standard +5 V rail with ±10% tolerance, compatible with legacy TTL systems |
| Standby current | ≤500 pA at VCC = 5.0 V-enables multi-year data retention on coin-cell backup |
| Data retention voltage | 2.0 V minimum-allows memory hold during deep brownout or controlled power-down sequences |
| Operating temperature | 0 °C to 70 °C-validated for commercial-grade embedded control and instrumentation applications |
| I/O compatibility | TTL input thresholds and output drive-interoperates directly with 74LS/74HC logic without level shifters |
Pinout & Package
Package: 28-pin plastic dual in-line package (PDIP), through-hole mounting, JEDEC MS-011AC compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address input | 15-bit address bus (32 K locations); latched on CE assertion, no internal address register |
| IO0–IO7 | Bidirectional data I/O | 8-bit parallel data path; high-impedance when OE = HIGH or CE = HIGH |
| CE | Chip enable | Active-low master select; initiates read/write and triggers automatic power-down when deasserted |
| OE | Output enable | Active-low control for data bus drivers; enables outputs only during read cycles when CE = LOW |
| WE | Write enable | Active-low signal qualifying write operations; sampled synchronously with CE to define write window |
| VCC | Power supply | +5 V core supply pin (Pin 28); requires local 0.1 µF decoupling |
| VSS | Ground | Signal and power ground reference (Pin 14); must be low-inductance connection |
Key Features
| Feature | Design Value |
|---|---|
| 15 ns access time | Meets cycle timing for 6502/Z80-based systems running at ≤33 MHz bus clock with wait-state-free operation |
| Automatic CE power-down | Reduces ICC to ≤500 pA without external control logic-eliminates need for sleep-mode sequencers |
| 2.0 V data retention | Preserves memory contents during undervoltage lockout (UVLO) or battery switchover events |
| TTL-compatible I/O | Direct interface to legacy microprocessor buses (e.g., Intel 8085, Motorola 6800) without translation circuitry |
| Low standby power | Enables long-term storage of configuration or calibration data in unpowered systems using supercapacitor hold-up |
Applications
| Industrial PLC Memory Buffer | Legacy Microprocessor System Cache |
|---|---|
Use Scenario: Storing real-time I/O status and ladder logic variables in programmable logic controllers with intermittent power loss. IC Role / Device Role / Timing Role: Asynchronous byte-wide SRAM providing deterministic 15 ns read/write access for scan-cycle execution. Use Value: Maintains volatile process data during brief AC dropout via 2.0 V retention, eliminating need for EEPROM wear-leveling. | Use Scenario: Acting as fast scratchpad memory for Z80 or 6502-based development boards and educational kits. IC Role / Device Role / Timing Role: Standalone parallel SRAM mapped into CPU address space with no wait states at 4 MHz bus speed. Use Value: TTL-compatible signaling and DIP-28 footprint allow direct socket replacement of obsolete 6116/6264 devices. |
| Medical Instrument Configuration Store | Test Equipment Firmware Overlay |
Use Scenario: Holding user-calibration coefficients and sensor offset tables in portable diagnostic devices with battery backup. IC Role / Device Role / Timing Role: Nonvolatile data buffer retaining values during shutdown using coin-cell-supplied 2.0 V hold voltage. Use Value: 500 pA ISB enables >10-year data retention on CR2032 cells without recharge circuitry. | Use Scenario: Loading firmware patches or instrument-specific drivers into automated test systems during boot sequence. IC Role / Device Role / Timing Role: Fast-access memory bank selected via FPGA address decoder for dynamic code loading. Use Value: 15 ns tRC allows full 32 KB image load in <500 µs-reducing system startup latency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar asynchronous SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AS6C4008-15PCN | Same 32 K × 8 organization and 15 ns access, but 3.3 V only (2.7–3.6 V); no 5 V support | Requires level-shifting or voltage conversion when replacing in +5 V systems | Select only if migrating entire system to 3.3 V and redesigning power delivery |
| IS61LV25616AL-15KLI | Wider 16-bit bus (16 K × 16), 3.3 V core, LVCMOS I/O; not pin-compatible | Needs PCB redesign and address/data bus remapping due to different pinout and bus width | Consider only for new designs targeting higher bandwidth and lower power, not drop-in replacement |
Compared with AS6C4008-15PCN and IS61LV25616AL-15KLI, CY7C199CN-15PXC uniquely supports legacy 5 V TTL systems without voltage translation while delivering guaranteed 15 ns timing and sub-nA standby-critical for cost-sensitive, long-lifecycle industrial retrofits.
Availability
CY7C199CN-15PXC is available at Aetrix Electronics and suitable for industrial PLC memory buffers, legacy microprocessor system caches, medical instrument configuration stores, and test equipment firmware overlays requiring stable component supply over extended production lifecycles.
Supply support for CY7C199CN-15PXC 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 consumer applications.
The CY7C199CN belongs to Cypress's legacy asynchronous SRAM product line, engineered specifically for pin-compatible replacement of aging 28-pin DIP SRAMs in cost-constrained, long-lifecycle embedded systems.
FAQ
Is CY7C199CN-15PXC RoHS-compliant?
Yes. The -15PXC suffix indicates lead-free (Pb-free) construction per RoHS Directive 2011/65/EU. The device uses matte tin lead finish and complies with JEDEC J-STD-020 moisture sensitivity level 3 (MSL-3) for surface-mount variants; this DIP version is exempt from MSL classification but conforms to same material restrictions.
Can CY7C199CN-15PXC operate at 3.3 V?
No. The device is specified only for 4.5 V to 5.5 V operation. Attempting 3.3 V supply results in undefined behavior, including failure to meet 15 ns access time, increased standby current, and potential data corruption. It lacks 3.3 V logic threshold compliance or internal voltage regulation.
What is the maximum operating frequency supported?
The CY7C199CN-15PXC does not use a clock; it is asynchronous. Its maximum effective throughput is governed by tRC = 15 ns, supporting up to ~66.7 MHz random-access cycle rate. Sustained burst reads/writes depend on external controller timing margins and bus capacitance-not an internal oscillator or PLL.
Does it require external pull-up resistors on IO pins?
No. The IO0–IO7 pins have active drivers in both directions and do not require external pull-ups. During high-impedance states (CE = HIGH or OE = HIGH), leakage is limited to ±5 pA-sufficient for clean bus sharing without termination. Pull-ups may cause contention or excess current if enabled during active drive.
CY7C199CN-15PXC 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
CY7C199CN-15PXC FAQ
1.How can I place an order for CY7C199CN-15PXC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C199CN-15PXC 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-15PXC reliable?
The price and inventory of CY7C199CN-15PXC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C199CN-15PXC is usually 5 days.
3.What payment methods are accepted for CY7C199CN-15PXC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C199CN-15PXC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C199CN-15PXC?
CY7C199CN-15PXC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C199CN-15PXC 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-15PXC?
For technical support, including CY7C199CN-15PXC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C199CN-15PXC requirements.
6.How does Aetrix verify that CY7C199CN-15PXC is sourced from the original manufacturer or authorized distributors?
All CY7C199CN-15PXC 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-15PXC meets industry standards.
7.What is the process for return or replacement of CY7C199CN-15PXC?
All CY7C199CN-15PXC units undergo pre-shipment inspection (PSI). If there is an issue with CY7C199CN-15PXC, 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-15PXC part is unused and in its original packaging.
Return procedure for CY7C199CN-15PXC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CY7C199CN-15PXC Tags
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