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Infineon Technologies CY7C128A-25PC
- Part No.:
- CY7C128A-25PC
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
CY7C128A-25PC.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,312
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Product details
Overview
CY7C128A-25PC from Cypress Semiconductor is a 2K × 8 (16 Kbit) CMOS static RAM with 25 ns maximum access time, TTL-compatible I/O, automatic CE-controlled power-down, and 5 V ±10% supply operation across 0°C to +70°C. It features 11 address pins (A0–A10), 8 bidirectional data lines (I/O0–I/O7), and three control inputs (CE, OE, WE) for standard memory interfacing in embedded controllers and industrial instrumentation.
For engineers reviewing the CY7C128A-25PC datasheet, CY7C128A-25PC pinout, CY7C128A-25PC application, or CY7C128A-25PC equivalent, key selection criteria include guaranteed 25 ns read cycle time (tRC), low active current (120 mA), standby current as low as 20 mA, and compatibility with DIP-24 (P13) packaging for through-hole prototyping and legacy board replacement.
Technical Context
The CY7C128A-25PC implements a fully decoded 2048-word × 8-bit SRAM array with asynchronous random-access behavior. Its control logic requires simultaneous CE and WE LOW for write initiation, while CE and OE LOW (with WE HIGH) enables read output-ensuring deterministic bus timing without internal clocks or refresh cycles.
Power management is handled via automatic CE-driven power-down: when CE remains HIGH, ICC drops to ≤20 mA (commercial), reducing active power by 83% versus operating mode. All I/Os maintain high-impedance states during deselection or write operations, eliminating bus contention without external tri-state logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2048 words × 8 bits = 16 Kbit; supports byte-wide data transfers without multiplexing or banking logic. |
| Access Time (tAA / tRC) | 25 ns max; ensures reliable interface with 20 MHz microcontrollers and FPGA-based address/data buses. |
| VCC Supply Range | 5.0 V ±10% (4.5–5.5 V); compatible with standard TTL/CMOS logic rails and eliminates need for dedicated LDO regulation. |
| Operating Current (ICC) | 120 mA max at VCC = 5.5 V; enables stable operation under full bus loading with minimal thermal derating. |
| Standby Current (ISB1) | 20 mA max (commercial); allows low-power sleep modes in battery-backed systems and portable instrumentation. |
| Input Voltage Threshold (VIH/VIL) | VIH = 2.2 V min, VIL = 0.8 V max; guarantees robust noise margin (>0.4 V) against TTL-level signal transitions. |
| ESD Rating | >2001 V (MIL-STD-883 Method 3015); provides inherent handling safety without external protection diodes. |
Pinout & Package
Package: 24-Lead (300-mil) Molded Dual In-line Package (DIP), package code P13 per Cypress ordering guide. Through-hole mounting with 0.3-inch row spacing and standard 0.1-inch pin pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A10 | Address Inputs | 11-bit binary address bus; selects one of 2048 memory locations; no internal latching-requires stable address during CE/OE assertion. |
| I/O0–I/O7 | Bidirectional Data Lines | 8-bit data path shared for read/write; enters high-Z when CE or OE is HIGH or WE is LOW-enables direct connection to microcontroller data bus. |
| CE | Chip Enable (active LOW) | Primary device select; initiates automatic power-down when HIGH, reducing ICC to ≤20 mA; required LOW for all read/write cycles. |
| OE | Output Enable (active LOW) | Controls output drivers only; must be LOW with CE LOW and WE HIGH to enable read data; does not affect write or power state. |
| WE | Write Enable (active LOW) | Enables write operation when CE is also LOW; data on I/O lines is latched on WE falling edge; high-Z outputs maintained during write if OE is HIGH. |
| VCC | Power Supply | +5 V ±10% supply input; decoupling capacitor (0.1 µF ceramic) required within 10 mm of pin for stable AC operation. |
| GND | Ground Reference | Signal and power ground return; must be connected to system common ground plane with low-inductance path. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic CE Power-Down | Reduces ICC from 120 mA to ≤20 mA when CE is HIGH-eliminates need for external power-gating circuitry in intermittent-access systems. |
| TTL-Compatible I/O Levels | VIH = 2.2 V min and VOL = 0.4 V max ensure seamless interoperability with 5 V microcontrollers, CPLDs, and legacy logic families. |
| Three-State Output Control | Independent OE and CE control allows flexible bus arbitration-outputs enter high-Z on any combination of CE HIGH, OE HIGH, or WE LOW. |
| Alpha Particle Immunity | Die coat process prevents single-event upsets (SEUs) in radiation-prone environments such as aerospace telemetry and medical imaging hardware. |
| 25 ns Guaranteed Timing | tAA and tRC both rated ≤25 ns over full commercial temperature range-supports deterministic timing closure in real-time control loops. |
Applications
| Industrial PLC Data Buffer | Legacy Microcontroller Memory Expansion |
|---|---|
Use Scenario: Storing temporary I/O status and register values in programmable logic controllers with 8-bit parallel buses. IC Role / Device Role / Timing Role: Byte-wide static RAM buffer interfaced directly to Z80 or 8051 derivatives via dedicated address/data bus. Use Value: 25 ns access enables sub-40 ns instruction cycle overhead; automatic power-down cuts idle power by 83% during scan pauses. |
Use Scenario: Adding external RAM to vintage 8-bit systems where on-chip memory is insufficient for firmware variables or display buffers. IC Role / Device Role / Timing Role: Standalone memory mapped at fixed address space using discrete address decoding logic. Use Value: DIP-24 package allows hand-soldered upgrades on through-hole PCBs; TTL compatibility avoids level-shifter design. |
| Medical Instrumentation FIFO | Test Equipment Data Capture Buffer |
Use Scenario: Capturing sensor samples in ECG or pulse oximetry devices requiring deterministic latency and zero-refresh operation. IC Role / Device Role / Timing Role: Non-volatile data staging buffer between analog front-end and serial processor interface. Use Value: No refresh circuitry eliminates timing jitter; 20 mA standby current extends battery life in portable diagnostics units. |
Use Scenario: Holding waveform snapshots or calibration tables in benchtop oscilloscopes and logic analyzers with parallel acquisition paths. IC Role / Device Role / Timing Role: High-speed capture RAM synchronized to trigger events using CE and WE strobes. Use Value: 25 ns tRC supports ≥20 MS/s sustained capture rates; high-Z outputs prevent bus contention during multi-channel readout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar static RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AS6C1008-25PC | 25 ns access, same 2K×8 organization, but uses 3.3 V supply and has lower ICC (30 mA active). | Requires level translation when interfacing with 5 V systems; unsuitable for legacy 5 V-only designs. | Select only if migrating to 3.3 V architecture and redesigning power delivery and I/O interfaces. |
| HM62256ALP-25 | 25 ns access, 32K×8 organization, 5 V supply, but lacks automatic power-down and has higher ISB (50 mA). | Offers 16× more capacity but consumes >2× standby current-less optimal for power-constrained portable use. | Prefer when memory density outweighs power efficiency, and board layout accommodates larger SOIC-28 footprint. |
Compared with AS6C1008-25PC and HM62256ALP-25, the CY7C128A-25PC uniquely balances 5 V compatibility, ultra-low standby current (20 mA), and proven DIP-24 form factor-making it the only drop-in solution for maintaining legacy 5 V industrial control hardware without redesign.
Availability
CY7C128A-25PC is available at Aetrix Electronics and suitable for industrial PLC data buffering, legacy microcontroller memory expansion, and medical instrumentation FIFO applications requiring stable component supply and long-term obsolescence support.
Supply support for CY7C128A-25PC 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 CY7C128A belongs to Cypress's legacy parallel SRAM product line, designed specifically for pin-compatible replacement of obsolete 2K×8 memory ICs in mission-critical industrial and medical equipment where reliability and long-term supply stability are mandatory.
FAQ
Is CY7C128A-25PC RoHS-compliant?
No-CY7C128A-25PC was manufactured prior to RoHS Directive enforcement and contains leaded solder in its DIP-24 package. It complies with J-STD-020 moisture sensitivity level 1 and meets MIL-STD-883 Class B screening for commercial-grade reliability testing.
Can CY7C128A-25PC operate at 4.5 V supply?
Yes-its specified VCC range is 4.5 V to 5.5 V. At 4.5 V, tRC increases to ≤30 ns (per typical characteristics curves), but all DC parameters-including VIH (2.2 V min) and VOL (0.4 V max)-remain fully guaranteed across the commercial temperature range.
What is the maximum capacitive load the I/O pins can drive?
The CY7C128A-25PC is characterized for 30 pF total load capacitance (including scope probe and PCB trace). Driving >30 pF may increase tDOE and tHZOE beyond 20 ns, potentially violating setup/hold margins in high-speed systems-external buffer drivers are recommended above 40 pF.
Does CY7C128A-25PC require an external clock or refresh signal?
No-it is a true static RAM with no clock input and zero refresh requirement. Data retention is indefinite as long as VCC remains within specification and ambient temperature stays within 0°C to +70°C, making it ideal for nonvolatile data logging without backup batteries.
CY7C128A-25PC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 24-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM - Asynchronous
- Memory Size:
- 16Kbit
- Memory Organization:
- 2K 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:
- 24-PDIP
CY7C128A-25PC FAQ
1.How can I place an order for CY7C128A-25PC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C128A-25PC 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 CY7C128A-25PC reliable?
The price and inventory of CY7C128A-25PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C128A-25PC is usually 5 days.
3.What payment methods are accepted for CY7C128A-25PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C128A-25PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C128A-25PC?
CY7C128A-25PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C128A-25PC 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 CY7C128A-25PC?
For technical support, including CY7C128A-25PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C128A-25PC requirements.
6.How does Aetrix verify that CY7C128A-25PC is sourced from the original manufacturer or authorized distributors?
All CY7C128A-25PC 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 CY7C128A-25PC meets industry standards.
7.What is the process for return or replacement of CY7C128A-25PC?
All CY7C128A-25PC units undergo pre-shipment inspection (PSI). If there is an issue with CY7C128A-25PC, 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 CY7C128A-25PC part is unused and in its original packaging.
Return procedure for CY7C128A-25PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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