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Infineon Technologies CY7C128A-35PC
- Part No.:
- CY7C128A-35PC
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
CY7C128A-35PC.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,301
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Product details
Overview
CY7C128A-35PC from Cypress Semiconductor is a 2K × 8 (16 Kbit) CMOS static RAM with 35 ns maximum access time, TTL-compatible I/O, and automatic CE-controlled power-down reducing standby current to 20 mA (commercial). It operates at 5 V ±10% over 0°C to +70°C and is used in legacy industrial controllers, instrumentation buffers, and microcontroller-based data acquisition systems requiring non-volatile-equivalent fast read/write without refresh.
For engineers reviewing the CY7C128A-35PC datasheet, CY7C128A-35PC pinout, CY7C128A-35PC application, or CY7C128A-35PC equivalent, key selection criteria include guaranteed 35 ns read cycle timing under commercial temperature conditions, CE/OE/WE three-control logic compatibility with 8-bit bus architectures, low active power (120 mA ICC), and DIP-24 package suitability for through-hole prototyping and repair.
Technical Context
The CY7C128A-35PC implements a fully static 2048-word × 8-bit memory array with asynchronous parallel interface logic. Its operation relies on three independent control signals-Chip Enable (CE̅), Output Enable (OE̅), and Write Enable (WE̅)-to manage read, write, and high-impedance states without internal clocks or timing constraints beyond specified setup/hold windows.
Power management is handled via CE̅-driven automatic power-down: when CE̅ is HIGH, the device enters low-power mode drawing only 20 mA (ISB1/ISB2), achieving 83% reduction versus active current. All inputs tolerate –0.5 V to +7.0 V, and outputs drive ±4 mA VOH/VOL while maintaining TTL voltage thresholds (VIH = 2.2 V, VIL ≤ 0.8 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2048 words × 8 bits (16 Kbit total); supports byte-wide data transfers without banking or interleaving. |
| Max Access Time | 35 ns (tAA, tRC); guarantees deterministic read latency for 28.6 MHz burst bus operation. |
| VCC Supply | 5 V ±10%; compatible with standard TTL/CMOS logic rails and eliminates need for dedicated LDO regulation. |
| Operating Temperature | 0°C to +70°C (Commercial); validated for use in office equipment, test fixtures, and non-automotive embedded systems. |
| Standby Current | 20 mA (ISB1/ISB2); enables low-power sleep modes in battery-backed or intermittently active systems. |
| I/O Voltage Compatibility | TTL-compatible inputs (VIH = 2.2 V, VIL ≤ 0.8 V) and outputs (VOH ≥ 2.4 V, VOL ≤ 0.4 V at IOL = 8 mA); ensures direct interfacing with 74LS/74HC families. |
| ESD Rating | >2001 V HBM; provides robust handling during manual assembly and board-level rework without additional protection circuitry. |
Pinout & Package
Package: 24-Lead (300-mil) Molded Dual In-Line Package (DIP), through-hole mount, JEDEC MS-001 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A10 | Address Inputs | 11-bit address bus selecting one of 2048 memory locations; no internal latching - requires stable address during CE̅/OE̅/WE̅ assertion. |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit tri-state data path; high-impedance when CE̅ or OE̅ is HIGH or WE̅ is LOW, enabling bus sharing. |
| CE̅ | Chip Enable (Active Low) | Primary device select; enables memory array and drivers when LOW; triggers automatic power-down when HIGH. |
| OE̅ | Output Enable (Active Low) | Controls output buffer enable only; does not affect internal array power state - valid only when CE̅ is LOW. |
| WE̅ | Write Enable (Active Low) | Initiates write cycle when CE̅ is also LOW; data on I/O pins is latched on WE̅ rising edge per tHD/tSD timing. |
| VCC | Power Supply | +5 V supply pin (Pin 24); decoupling capacitor required within 10 mm for stable 35 ns switching. |
| GND | Ground Reference | Signal and power ground (Pin 12); must be low-inductance connection shared with system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic CE̅-controlled power-down | Reduces ICC from 120 mA to 20 mA instantly upon chip disable - eliminates external power gating logic. |
| Three-state output drivers with TTL-compatible levels | Enables direct connection to 8-bit microprocessor data buses (e.g., Z80, 8085, 68000) without level-shifting or bus transceivers. |
| High ESD immunity (>2001 V HBM) | Meets MIL-STD-883 Method 3015; allows safe handling in uncontrolled environments without wrist straps or ionizers. |
| Alpha particle immunity via die coat | Prevents single-event upsets (SEUs) in terrestrial applications exposed to cosmic radiation or packaging materials. |
| Full static operation - no refresh required | Eliminates DRAM controller complexity and timing overhead; simplifies firmware design for real-time deterministic access. |
Applications
| Industrial PLC Data Buffer | Legacy Test Equipment Memory |
|---|---|
|
Use Scenario: Stores real-time sensor readings and control setpoints in programmable logic controllers with 8-bit parallel bus interfaces. IC Role / Device Role / Timing Role: Static RAM providing zero-wait-state read/write access for cyclic scan logic at 1–10 ms intervals. Use Value: 35 ns access time ensures full data capture within tight scan cycles; CE̅-power-down reduces average power in idle periods between scans. |
Use Scenario: Holds calibration coefficients and waveform lookup tables in benchtop oscilloscopes and signal generators built before 2005. IC Role / Device Role / Timing Role: Non-refreshing memory mapped into CPU address space for fast coefficient retrieval during analog output generation. Use Value: TTL compatibility avoids level translation; DIP-24 package enables field replacement without PCB redesign. |
| Microcontroller-Based Data Logger | Embedded Communication Protocol Stack Buffer |
|
Use Scenario: Buffers serially received telemetry packets before CRC validation and flash storage in remote environmental monitors. IC Role / Device Role / Timing Role: Temporary holding register for packet assembly; accessed via GPIO-banged parallel interface on resource-constrained MCUs. Use Value: 20 mA standby current extends battery life during multi-second receive gaps; 8-bit width matches common UART FIFO depths. |
Use Scenario: Stores intermediate frame payloads and header metadata in RS-485 gateway modules implementing Modbus RTU or CAN-to-serial bridges. IC Role / Device Role / Timing Role: Shared memory resource for dual-CPU or DMA+CPU architectures managing concurrent protocol parsing and transmission. Use Value: Tri-state I/O enables clean bus arbitration between master and slave processors; 35 ns timing supports 2.86 MB/s peak throughput. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar static RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AS6C1008-35PC | Same 2K × 8 organization and 35 ns speed, but uses CMOS input thresholds (VIH = 70% VCC) and lower ICC (90 mA). | Requires level-shifting when interfacing with TTL microcontrollers; better suited for new designs targeting lower power. | Select if migrating from legacy TTL systems to modern low-power embedded platforms with CMOS-native buses. |
| HM62256ALP-10 | 256K × 8 (2 Mbit), 100 ns access, 5 V-only, no automatic power-down; higher density but slower and less power-efficient. | Used where memory expansion is prioritized over speed - e.g., firmware staging buffers in boot ROM loaders. | Choose only when capacity >16 Kbit is mandatory and 35 ns timing is non-critical; not drop-in compatible due to pinout and timing differences. |
Compared with AS6C1008-35PC and HM62256ALP-10, the CY7C128A-35PC uniquely delivers TTL-compatible signaling, guaranteed 35 ns performance in commercial grade, and hardware-enforced power-down - making it irreplaceable in legacy 8-bit systems where timing, voltage, and control logic match are non-negotiable.
Availability
CY7C128A-35PC is available at Aetrix Electronics and suitable for industrial PLC data buffering, legacy test equipment memory upgrades, and microcontroller-based data loggers requiring stable component supply across long-lifecycle programs.
Supply support for CY7C128A-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, PSoC, USB, and clock solutions for industrial and consumer electronics.
The CY7C128A belongs to Cypress's legacy parallel SRAM product line, designed specifically for pin- and timing-compatible replacement of obsolete 2K×8 TTL SRAMs in retrofitted industrial control and instrumentation systems.
FAQ
Is CY7C128A-35PC RoHS-compliant?
No. The CY7C128A-35PC is a legacy component manufactured prior to RoHS Directive 2002/95/EC implementation and contains lead in its 24-pin DIP package and solder finish. It is exempt under Category 7 (monitoring and control instruments) for repair and obsolescence mitigation in existing equipment.
Can CY7C128A-35PC operate at 3.3 V?
No. The device is specified only for 5 V ±10% (4.5 V to 5.5 V) operation. Applying 3.3 V results in VIH violation (minimum 2.2 V required), unreliable output drive, and undefined timing margins - confirmed by DC characteristics tables and absolute maximum ratings.
What is the meaning of "automatic power-down" in this SRAM?
Automatic power-down is a hardware feature triggered solely by CE̅ going HIGH. It disables internal array drivers and sense amplifiers, reducing ICC from 120 mA to 20 mA without software intervention or external circuitry - verified in ISB1/ISB2 electrical characteristics on page 2 of the datasheet.
Does CY7C128A-35PC support battery backup operation?
No. The device lacks a VBAT pin or internal switch-over circuitry. While it retains data as long as VCC remains within 4.5–5.5 V, it has no provision for seamless transition to backup power - unlike NVSRAM or BBSRAM devices. External battery switchover must be implemented externally if required.
CY7C128A-35PC 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:
- 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:
- 24-PDIP
CY7C128A-35PC FAQ
1.How can I place an order for CY7C128A-35PC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C128A-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 CY7C128A-35PC reliable?
The price and inventory of CY7C128A-35PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C128A-35PC is usually 5 days.
3.What payment methods are accepted for CY7C128A-35PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C128A-35PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C128A-35PC?
CY7C128A-35PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C128A-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 CY7C128A-35PC?
For technical support, including CY7C128A-35PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C128A-35PC requirements.
6.How does Aetrix verify that CY7C128A-35PC is sourced from the original manufacturer or authorized distributors?
All CY7C128A-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 CY7C128A-35PC meets industry standards.
7.What is the process for return or replacement of CY7C128A-35PC?
All CY7C128A-35PC units undergo pre-shipment inspection (PSI). If there is an issue with CY7C128A-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 CY7C128A-35PC part is unused and in its original packaging.
Return procedure for CY7C128A-35PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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