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Infineon Technologies CY7C199CN-25PXC
- Part No.:
- CY7C199CN-25PXC
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-DIP (0.300", 7.62mm)
- Datasheet:
-
CY7C199CN-25PXC.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,844
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Product details
Overview
CY7C199CN-25PXC from Cypress Semiconductor is a 256K (32K × 8) asynchronous CMOS static RAM with 25 ns access time, 5.0V ±10% supply range, and automatic CE-controlled power-down mode. It operates across commercial temperature range (0°C to 70°C), supports TTL-compatible I/O, and retains data at 2.0V - used in legacy microcontroller-based instrumentation buffers and industrial PLC memory expansion.
For engineers reviewing the CY7C199CN-25PXC datasheet, CY7C199CN-25PXC pinout, CY7C199CN-25PXC application, or CY7C199CN-25PXC equivalent, key selection criteria include verified 25 ns tAA timing, 500 µA ISB2 standby current under CMOS input conditions, VCC=4.5–5.5V compliance, and DIP-28 package compatibility with through-hole board layouts.
Technical Context
The CY7C199CN-25PXC implements a fully asynchronous SRAM interface with independent CE, OE, and WE controls. 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.
All timing parameters are specified under defined AC test loads (30 pF C1, 480 Ω R1/R3) and transition rates (≤3 ns). Data retention at 2.0V is guaranteed with CE ≥ VCC–0.3V and VIN clamped to rail-safe levels - a feature critical for brown-out resilience in embedded control systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8 bits - provides byte-wide data bus interface compatible with 8-bit microcontrollers and legacy peripherals |
| Access Time (tAA) | 25 ns - defines maximum clock-to-data delay in read cycles; meets timing for 20 MHz bus operation |
| VCC Supply Range | 4.5 V to 5.5 V - ensures interoperability with standard 5V TTL/CMOS logic families and legacy power rails |
| Standby Current (ISB2) | 500 µA max at VCC = 5.5 V, f = 0 - enables low-power hold mode during processor sleep without external gating |
| Data Retention Voltage | 2.0 V min - allows memory contents to persist during brown-out events down to 2.0V VCC without backup battery |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade industrial control panels and test equipment environments |
| Input/Output Compatibility | TTL-compatible VIH/VIL and VOH/VOL - eliminates level-shifting requirements when interfacing with 74LS/HC logic |
Pinout & Package
Package: 28-pin Dual In-line Package (DIP), through-hole mounting, Pb-free lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Input | 15-bit address bus (A0 LSB to A14 MSB) selects one of 32K locations; no internal latching |
| IO0–IO7 | Bidirectional Data I/O | 8-bit data bus; high-impedance when CE or OE is inactive - enables bus sharing without external transceivers |
| CE | Chip Enable | Active-low global enable; drives device into 500 µA standby when high - primary power management control |
| OE | Output Enable | Active-low read control; output disabled (high-Z) when high, even if CE is active - supports multiplexed bus reads |
| WE | Write Enable | Active-low write strobe; initiates write on falling edge concurrent with CE low - enables asynchronous burst writes |
| VCC | Power Supply | +5.0V ±10% core supply; decoupling required within 10 mm of pin 28 per layout guidelines |
| VSS | Ground | Signal and power return; pin 14 must be connected directly to PCB ground plane for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Automated CE Power-Down | Reduces ICC to ≤500 µA without external control logic - simplifies low-power state management in battery-backed systems |
| 2.0V Data Retention | Maintains stored data during undervoltage events down to 2.0V VCC - eliminates need for external keep-alive circuitry |
| TTL-Compatible I/O | Accepts 0.8V/2.0V logic thresholds and drives 2.4V/0.4V levels at 4mA/8mA - interoperable with legacy 74-series logic |
| Multiple Package Options | DIP-28 footprint matches legacy board designs; also available in SOJ-28 and TSOP-I-28 for space-constrained upgrades |
| Industrial Temperature Support | Qualified for –40°C to +85°C operation in -I variant - same pinout and timing as -25PXC with extended thermal margin |
Applications
| Industrial PLC Memory Expansion | Legacy Microcontroller Data Buffering |
|---|---|
|
Use Scenario: Adding external RAM to 8051- or Z80-based programmable logic controllers where on-chip RAM is insufficient for ladder logic execution stacks. IC Role / Device Role / Timing Role: Asynchronous byte-wide memory mapped at fixed address range; accessed via discrete CE/OE/WE strobes synchronized to CPU bus cycle. Use Value: Enables 32KB of deterministic-access scratchpad memory without wait-state insertion - maintains real-time scan cycle integrity. |
Use Scenario: Providing temporary storage for sensor acquisition buffers in handheld test meters using 8-bit MCUs with limited internal RAM. IC Role / Device Role / Timing Role: Standalone SRAM acting as circular buffer for ADC samples; controlled by MCU GPIO-driven CE/OE/WE signals. Use Value: 25 ns access supports sampling rates up to 20 kSPS with full 8-bit resolution and zero software overhead for memory management. |
| Embedded Instrumentation Display Cache | Communications Protocol Stack Buffer |
|
Use Scenario: Storing frame buffer contents for monochrome LCD displays in benchtop oscilloscopes and spectrum analyzers. IC Role / Device Role / Timing Role: Dedicated display memory accessed concurrently by CPU and display controller via shared bus arbitration. Use Value: High-Z tri-state outputs allow clean bus sharing; 500 µA standby current extends battery life during screen blanking intervals. |
Use Scenario: Holding packet payloads and protocol state variables in RS-485 fieldbus gateways based on legacy 80C51 derivatives. IC Role / Device Role / Timing Role: Dual-port accessible memory region used for interrupt-driven receive/transmit FIFOs with hardware handshaking. Use Value: 2.0V data retention preserves last valid packet during brief power interruptions - prevents communication session loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar asynchronous SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AS6C4008-25ZIN | 25 ns tAA, 32K × 8, 2.7–3.6V only - no 5V support | Requires level-shifting or separate 3.3V rail; unsuitable for direct 5V TTL replacement | Select only if migrating to 3.3V system architecture and redesigning power delivery |
| IS61LV25616AL-25TQLI | 25 ns tAA, 256K × 16, 3.3V supply, 32-pin TSOP II - wider data bus, different pinout | Provides 16-bit interface; incompatible pin mapping and voltage domain - not drop-in | Choose when upgrading to 16-bit MCU and redesigning PCB layout for higher bandwidth |
Compared with AS6C4008-25ZIN and IS61LV25616AL-25TQLI, the CY7C199CN-25PXC uniquely supports 5V TTL compatibility, DIP-28 through-hole packaging, and 2.0V data retention - making it irreplaceable in legacy 5V industrial control boards requiring zero-layout-change upgrades.
Availability
CY7C199CN-25PXC is available at Aetrix Electronics and suitable for industrial PLC memory expansion, legacy microcontroller data buffering, and embedded instrumentation display cache applications requiring stable component supply and long-term obsolescence mitigation.
Supply support for CY7C199CN-25PXC 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 logic solutions for industrial, automotive, and communications markets.
The CY7C199CN belongs to Cypress's legacy asynchronous SRAM product line, engineered specifically for pin-compatible replacement of obsolete 28-pin 5V SRAMs in cost-sensitive, long-lifecycle industrial control systems.
FAQ
Is CY7C199CN-25PXC RoHS compliant?
Yes. The "PXC" suffix denotes a Pb-free, RoHS-compliant 28-pin DIP package with matte tin lead finish. Cypress confirmed full compliance per EU Directive 2011/65/EU and JESD204B, with no exemptions applied. Certificate of Compliance is available upon request for batch-specific traceability.
Can CY7C199CN-25PXC operate at 4.0V?
No. The absolute minimum VCC is 4.5V per DC Electrical Characteristics (page 4). Operation below 4.5V violates specification limits for VIH (2.2V min), VOH (2.4V min), and ICC stability - data corruption or failure to retain may occur.
What is the maximum capacitive load the IO pins can drive?
The IO pins are characterized for 30 pF load (per AC Test Loads table, page 5). Driving >30 pF increases tHZOE/tHZCE delays beyond spec (e.g., tHZOE max = 9 ns at 30 pF); for 50 pF loads, timing margins degrade by ~2.5 ns - derating or buffer use is required.
Does CY7C199CN-25PXC support battery backup mode?
It does not include built-in battery switchover circuitry, but its 2.0V data retention capability allows external battery backup at 2.0–3.0V via diode-OR configuration. Cypress Application Note AN2157 details implementation using a 3V lithium coin cell and low-leakage Schottky diode.
CY7C199CN-25PXC 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:
- 25ns
- Access Time:
- 25 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-25PXC FAQ
1.How can I place an order for CY7C199CN-25PXC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C199CN-25PXC 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-25PXC reliable?
The price and inventory of CY7C199CN-25PXC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C199CN-25PXC is usually 5 days.
3.What payment methods are accepted for CY7C199CN-25PXC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C199CN-25PXC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C199CN-25PXC?
CY7C199CN-25PXC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C199CN-25PXC 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-25PXC?
For technical support, including CY7C199CN-25PXC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C199CN-25PXC requirements.
6.How does Aetrix verify that CY7C199CN-25PXC is sourced from the original manufacturer or authorized distributors?
All CY7C199CN-25PXC 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-25PXC meets industry standards.
7.What is the process for return or replacement of CY7C199CN-25PXC?
All CY7C199CN-25PXC units undergo pre-shipment inspection (PSI). If there is an issue with CY7C199CN-25PXC, 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-25PXC part is unused and in its original packaging.
Return procedure for CY7C199CN-25PXC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CY7C199CN-25PXC Tags
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