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Infineon Technologies CY7C128A-25VC
- Part No.:
- CY7C128A-25VC
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 24-BSOJ (0.300", 7.62mm Width)
- Datasheet:
-
CY7C128A-25VC.pdf
- Description:
- IC SRAM 16KBIT 25NS 24SOJ
- Quantity:
- Payment:
- Shipping:
Inventory:1,067
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Product details
Overview
CY7C128A-25VC from Cypress Semiconductor is a 2K × 8 (16 Kbit) high-speed CMOS static RAM with 25 ns maximum access time, TTL-compatible I/O, and automatic CE-controlled power-down reducing standby current to 20 mA. It operates at 5 V ±10% over 0°C to +70°C and is packaged in a 24-lead molded SOJ (V13) for board-level space efficiency in embedded control and instrumentation memory buffers.
For engineers reviewing the CY7C128A-25VC datasheet, CY7C128A-25VC pinout, CY7C128A-25VC application, or CY7C128A-25VC equivalent, key selection criteria include guaranteed 25 ns read cycle time, dual active-low CE/OE control for multi-chip decoding, low 20 mA standby current under CE-high power-down, and SOJ package compatibility with legacy 24-pin memory footprints.
Technical Context
The CY7C128A-25VC implements a fully static 2048 × 8 asynchronous SRAM array with three-state bidirectional I/Os (I/O0–I/O7), decoded via 11 address lines (A0–A10). Its operation requires no clocks or refresh cycles, relying solely on CE, OE, and WE timing coordination.
Power management is handled by automatic CE-driven power-down: when CE is HIGH, internal circuitry disables, reducing ICC to ISB1/ISB2 levels (20 mA max commercial); write initiation requires simultaneous CE LOW and WE LOW, while read requires CE LOW and OE LOW with WE HIGH.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2048 words × 8 bits = 16 Kbit; supports byte-wide data bus interfacing without external demultiplexing. |
| Max Access Time (tAA) | 25 ns; guarantees valid data on I/O pins within 25 ns after stable address and CE/OE assertion - critical for 40 MHz CPU bus interfacing. |
| VCC Supply | 5 V ±10%; compatible with standard TTL/CMOS logic rails and eliminates need for dedicated voltage regulation in 5 V systems. |
| Standby Current (ISB1) | 20 mA max (commercial); enables low-power hold mode during processor idle cycles without external power gating. |
| Input Voltage (VIH/VIL) | VIH = 2.2 V min, VIL = 0.8 V max; ensures robust noise margin and direct interface with 5 V TTL and CMOS outputs. |
| Output Drive (VOH/VOL) | VOH ≥ 2.4 V @ –4 mA, VOL ≤ 0.4 V @ 8 mA; meets TTL output swing requirements for reliable level translation into downstream logic. |
| ESD Rating | >2001 V (MIL-STD-883 Method 3015); provides built-in handling robustness during PCB assembly and field service. |
Pinout & Package
Package: 24-lead molded SOJ (Small Outline J-Lead), V13 footprint per ordering information - 300-mil body width, J-bend leads, JEDEC MS-013 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A10 | Address Inputs | 11-bit binary address bus selecting one of 2048 memory locations; latched internally on CE/OE/WE transitions. |
| I/O0–I/O7 | Bidirectional Data Bus | Three-state CMOS I/O pins shared for read data output and write data input; high-impedance when CE or OE is HIGH or WE is LOW. |
| CE | Chip Enable (active LOW) | Primary device select; enables memory array and drivers; HIGH forces automatic power-down and high-Z I/O state. |
| OE | Output Enable (active LOW) | Controls read data output only; must be LOW with CE LOW and WE HIGH to drive I/O pins with valid data. |
| WE | Write Enable (active LOW) | Controls write operation; LOW with CE LOW initiates write; HIGH during CE LOW enables read mode. |
| VCC | Power Supply | +5 V supply pin (Pin 24); decoupling capacitor required adjacent to pin for stable 25 ns timing compliance. |
| GND | Ground Reference | Signal and power ground (Pin 12); must be low-inductance connection to minimize switching noise on I/O and address lines. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic CE Power-Down | Reduces standby current to 20 mA without external control logic - simplifies low-power system design and eliminates need for sleep-mode sequencing. |
| TTL-Compatible I/O | Direct interface with 5 V microcontrollers, FPGAs, and ASICs without level shifters - reduces BOM count and layout complexity. |
| High Noise Immunity | VIH = 2.2 V minimum and >2001 V ESD rating ensure reliable operation in electrically noisy industrial environments. |
| Three-State Output Drivers | Enables direct connection to shared data buses; high-impedance state prevents bus contention during deselect or write cycles. |
| Alpha Particle Hardening | Die coat process mitigates soft errors in radiation-prone applications such as avionics and medical imaging subsystems. |
Applications
| Industrial PLC Memory Buffer | Legacy Microcontroller Data RAM |
|---|---|
|
Use Scenario: Storing real-time I/O status and control registers in programmable logic controllers with 8-bit parallel buses. IC Role / Device Role / Timing Role: Asynchronous byte-wide SRAM providing zero-wait-state data storage for deterministic scan-cycle execution. Use Value: 25 ns access time ensures full CPU utilization at 33 MHz bus clock; SOJ package fits constrained DIN-rail mounted PCB layouts. |
Use Scenario: External data RAM expansion for 8051, Z80, or 6809-based embedded systems requiring more than on-chip RAM. IC Role / Device Role / Timing Role: Standalone static RAM mapped into processor's external memory space using CE/OE/WE decode logic. Use Value: TTL-compatible signaling eliminates level-shifting components; automatic power-down extends battery life in portable test equipment. |
| Medical Instrumentation FIFO | Communications Protocol Stack Buffer |
|
Use Scenario: Temporary storage of sampled sensor data (ECG, EEG) prior to digital filtering and transmission in diagnostic devices. IC Role / Device Role / Timing Role: Dual-port accessible buffer supporting concurrent acquisition and processing via external address multiplexing. Use Value: Low 0.4 V VOL and 2.4 V VOH guarantee signal integrity across long traces in mixed-signal PCBs with analog front-ends. |
Use Scenario: Message buffering in RS-485 or CAN protocol gateways where packet assembly/disassembly requires fast local memory. IC Role / Device Role / Timing Role: Non-volatile-supporting volatile RAM used for transient packet payload storage between UART and transceiver layers. Use Value: 20 mA standby current allows continuous buffer readiness during network idle periods without thermal derating concerns. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar static RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AS6C1008-25ZIN | 25 ns access, 5 V, 2K × 8, but uses SOIC-28 (wider pitch) and lacks automatic CE power-down - requires external enable logic. | SOIC-28 footprint incompatible with CY7C128A-25VC's SOJ-24; higher standby current (35 mA) limits use in battery-backed systems. | Select if SOIC-28 is already standardized in your design and external power control is acceptable. |
| ISSI IS61LV25616AL-25MLI | 256K × 16 organization, 3.3 V only, 25 ns, LVTTL I/O - not pin-compatible and requires voltage translation for 5 V systems. | Higher density and lower voltage limit use to modern 3.3 V designs; incompatible with 5 V address/data buses without level shifters. | Select only for new 3.3 V platforms needing larger memory; not a drop-in replacement for CY7C128A-25VC. |
Compared with AS6C1008-25ZIN and IS61LV25616AL-25MLI, the CY7C128A-25VC uniquely delivers 5 V TTL compatibility, SOJ-24 footprint, and autonomous CE-driven power-down - making it irreplaceable in legacy 5 V industrial controllers where board space and power sequencing simplicity are critical.
Availability
CY7C128A-25VC is available at Aetrix Electronics and suitable for industrial PLC memory buffers, legacy microcontroller data RAM expansion, medical instrumentation FIFOs, and communications protocol stack buffers requiring stable component supply across extended product lifecycles.
Supply support for CY7C128A-25VC 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, automotive, and consumer markets.
The CY7C128A belongs to Cypress's legacy parallel SRAM product line, designed specifically for cost-sensitive, high-reliability 5 V embedded systems requiring simple, robust, and timing-predictable memory interfaces.
FAQ
Is CY7C128A-25VC compatible with 3.3 V systems?
No. The CY7C128A-25VC is specified only for 5 V ±10% operation (4.5 V to 5.5 V). Its VIH minimum is 2.2 V and VOL maximum is 0.4 V under 5 V conditions - applying 3.3 V to VCC violates absolute maximum ratings and will cause functional failure or permanent damage.
What is the difference between ISB1 and ISB2 standby current specifications?
ISB1 (automatic CE power-down current) applies when CE > VIH and all inputs are stable; ISB2 applies when CE is near VCC or GND (e.g., floating or weakly driven). For CY7C128A-25VC commercial grade, both are 20 mA max - ensuring consistent low-power behavior across realistic board-level signal integrity conditions.
Can CY7C128A-25VC be used in military-temperature-range applications?
No. The -25VC suffix denotes commercial temperature range (0°C to +70°C) and SOJ packaging. Military-grade variants (e.g., CY7C128A-25DMB) use CerDIP packaging and are rated for –55°C to +125°C - the -25VC variant is not qualified or tested for extended temperature operation.
Does CY7C128A-25VC require an external clock or refresh signal?
No. As a static RAM, the CY7C128A-25VC has no clock input and requires no refresh cycles. Data retention is indefinite as long as VCC is applied and CE is held LOW during active use - eliminating timing-critical refresh overhead in microcontroller or FPGA-based systems.
CY7C128A-25VC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 24-BSOJ (0.300", 7.62mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
- 24-SOJ
CY7C128A-25VC FAQ
1.How can I place an order for CY7C128A-25VC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C128A-25VC 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-25VC reliable?
The price and inventory of CY7C128A-25VC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C128A-25VC is usually 5 days.
3.What payment methods are accepted for CY7C128A-25VC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C128A-25VC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C128A-25VC?
CY7C128A-25VC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C128A-25VC 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-25VC?
For technical support, including CY7C128A-25VC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C128A-25VC requirements.
6.How does Aetrix verify that CY7C128A-25VC is sourced from the original manufacturer or authorized distributors?
All CY7C128A-25VC 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-25VC meets industry standards.
7.What is the process for return or replacement of CY7C128A-25VC?
All CY7C128A-25VC units undergo pre-shipment inspection (PSI). If there is an issue with CY7C128A-25VC, 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-25VC part is unused and in its original packaging.
Return procedure for CY7C128A-25VC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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