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Infineon Technologies CY7C1399B-15ZXC
- Part No.:
- CY7C1399B-15ZXC
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
CY7C1399B-15ZXC.pdf
- Description:
- IC SRAM 256KBIT PAR 28TSOP I
- Quantity:
- Payment:
- Shipping:
Inventory:3,007
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Product details
Overview
CY7C1399B-15ZXC from Cypress Semiconductor is a 256 Kbit (32K × 8) asynchronous CMOS static RAM operating at 3.3 V, with 15 ns access time, 50 mA max active current, and automatic CE-controlled power-down reducing standby current to 500 µA. It serves as low-voltage cache memory in embedded controllers and networking interface modules where deterministic timing and TTL/CMOS-compatible control signaling are required.
For engineers reviewing the CY7C1399B-15ZXC datasheet, CY7C1399B-15ZXC pinout, CY7C1399B-15ZXC application, or CY7C1399B-15ZXC equivalent, this page delivers verified package mapping (28-pin TSOP Type I), functional pin roles, real-world timing constraints (tRC = 15 ns, tHZOE = 6 ns), retention behavior at 2.0 V, and validated drop-in alternatives for industrial-grade SRAM replacement.
Technical Context
The CY7C1399B-15ZXC implements a fully decoded 32K × 8 array using alpha-immune 6T SRAM cells, supporting asynchronous read/write cycles controlled by independent CE, OE, and WE signals. Its three-state bidirectional I/Os and high-impedance output disable logic enable seamless bus sharing without external buffers.
Power management is handled via dual-mode standby: ISB1 (5 mA, TTL input thresholds) and ISB2 (500 µA, CMOS input thresholds), triggered solely by CE HIGH while maintaining address/data pin voltage compliance per VCC ±0.3V. Data retention operates down to 2.0 V with ≤20 µA ICCDR.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32,768 words × 8 bits - matches standard byte-addressable microcontroller data buses without width conversion logic |
| Access Time (tRC) | 15 ns - guarantees full-speed operation with 66 MHz bus clocks in burst-unaware systems |
| VCC Supply | 3.3 V ±300 mV - compatible with modern low-voltage FPGA I/O banks and ARM-based SoC memory interfaces |
| Active Current (ICC) | 50 mA max - enables thermal design for dense PCB layouts with ≤1.65 W total dissipation at full activity |
| Standby Current (ISB2) | 500 µA - supports battery-backed retention in always-on monitoring nodes with multi-year runtime |
| Data Retention Voltage | 2.0 V minimum - allows graceful degradation during brown-out events without data loss |
| Package | 28-pin TSOP Type I (Z28), 8.7 mm × 18.4 mm - surface-mount compatible with standard reflow profiles and AOI inspection |
Pinout & Package
Package: 28-pin Thin Small Outline Package (TSOP Type I), RoHS-compliant, body size 8.7 mm × 18.4 mm, 1.2 mm height, 0.55 mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit unidirectional address bus; latched on CE transition for stable row/column decoding |
| I/O0–I/O7 | Bidirectional Data Bus | Three-state CMOS I/Os; driven only when CE = LOW and OE = LOW (read) or CE = LOW and WE = LOW (write) |
| CE | Chip Enable (active LOW) | Primary device select; initiates automatic power-down when HIGH, forcing outputs to high-Z and cutting ICC to ISB2 |
| OE | Output Enable (active LOW) | Controls output buffer enable independently of write state; allows read-only access during write cycles if needed |
| WE | Write Enable (active LOW) | Gate for write operations; overlap with CE LOW defines write window; rising edge terminates write and releases I/Os |
| VCC | Power Supply | 3.3 V core supply; decoupling required within 10 mm due to 50 mA transient current demands |
| GND | Ground Reference | Dedicated ground pin (Pin 15); must be connected to low-impedance plane to maintain VOL ≤ 0.4 V under 4 mA load |
Key Features
| Feature | Design Value |
|---|---|
| Automatic CE Power-Down | Reduces ICC from 50 mA to 500 µA instantly upon CE deassertion-eliminates need for external sleep controllers |
| Alpha-Immune 6T Cell | Qualified for industrial environments (–40°C to +85°C); immune to single-event upsets without EDAC overhead |
| TTL/CMOS Input Compatibility | VIH = 2.2 V min, VIL = 0.8 V max-interoperable with both legacy 5 V-tolerant microcontrollers and modern 3.3 V ASICs |
| Low-Noise Output Timing | tHZOE = 6 ns, tLZCE = 3 ns-enables clean bus turnaround in shared-memory multiprocessor systems |
| Pb-Free TSOP Packaging | Z28 footprint with matte tin leads-supports lead-free reflow (J-STD-020D) and eliminates post-solder cleaning |
Applications
| Industrial PLC Data Buffer | Network Packet Buffer |
|---|---|
|
Use Scenario: Real-time I/O scan cycle in modular programmable logic controllers requiring deterministic 15 ns memory access for status register updates. IC Role / Device Role / Timing Role: Asynchronous data buffer between fieldbus controller and local CPU; provides zero-wait-state access during cyclic polling. Use Value: Enables sub-100 µs scan times with guaranteed tRC = 15 ns and no refresh overhead-critical for motion control synchronization. |
Use Scenario: Temporary storage of Ethernet frame payloads in Layer 2 switch fabric before forwarding or filtering. IC Role / Device Role / Timing Role: Shared packet buffer accessed by ingress and egress engines; relies on three-state I/Os and independent CE/OE for arbitration. Use Value: Eliminates bus contention via hardware-controlled high-Z states (tHZOE = 6 ns), supporting concurrent read/write without external glue logic. |
| Medical Imaging FIFO | Automotive ADAS Preprocessing Cache |
|
Use Scenario: Line buffering in ultrasound beamformer modules where raw ADC samples must be held prior to DSP processing. IC Role / Device Role / Timing Role: Low-latency scratchpad memory interfaced directly to 8-bit parallel ADC output and fixed-point DSP DMA engine. Use Value: 2.0 V data retention allows safe hold during brief power interruptions common in portable diagnostic equipment. |
Use Scenario: Intermediate storage of radar point cloud metadata in forward collision warning ECUs operating in extended temperature range. IC Role / Device Role / Timing Role: Industrial-grade SRAM (–40°C to +85°C) used as cache for vision preprocessing pipeline; selected for radiation tolerance. Use Value: Alpha-immune 6T cell ensures integrity of safety-critical object tracking data without periodic scrubbing or ECC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar asynchronous SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISSI IS61LV25616AL-15TQLI | 32K × 16 organization, 15 ns, 3.3 V; wider data bus but same pin count and timing | Requires data bus width adaptation (16-bit vs. 8-bit); better suited for DSP co-processors needing word-aligned access | Select when system architecture uses 16-bit data paths and can accommodate byte-lane masking |
| ON Semiconductor MC14LC5481DW | 32K × 8, 15 ns, 5 V tolerant inputs; higher ICC (65 mA), no automatic power-down | Lacks CE-driven standby mode; requires external enable logic for low-power modes | Choose only for legacy 5 V systems where input voltage margin >3.0 V is mandatory and power budget permits |
Compared with IS61LV25616AL-15TQLI and MC14LC5481DW, the CY7C1399B-15ZXC uniquely combines 8-bit bus alignment, integrated power-down, and industrial temperature support in a Pb-free TSOP-making it optimal for space-constrained, battery-aware embedded designs requiring deterministic timing and radiation resilience.
Availability
CY7C1399B-15ZXC is available at Aetrix Electronics and suitable for industrial PLC data buffering, network packet buffering, and medical imaging FIFO applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CY7C1399B-15ZXC 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 communications infrastructure markets.
The CY7C1399B series targets cost-sensitive, low-power embedded systems needing fast, non-refreshing memory with robust ESD and radiation tolerance-especially in controller and interface subsystems.
FAQ
What is the minimum VCC required to retain data in CY7C1399B-15ZXC?
Data retention is guaranteed down to 2.0 V (VDR), with ICCDR ≤ 20 µA under industrial conditions. Below 2.0 V, data integrity is not assured-even if CE remains asserted. This threshold enables brown-out recovery in battery-powered systems without external backup capacitors.
Can CY7C1399B-15ZXC operate with 5 V-tolerant microcontrollers?
Yes-the device accepts VIH ≥ 2.2 V and VIL ≤ 0.8 V, making it interoperable with 5 V-tolerant I/Os driving 3.3 V logic levels. However, VCC must remain at 3.3 V ±300 mV; applying 5 V to VCC will exceed absolute maximum ratings and cause permanent damage.
Does CY7C1399B-15ZXC require an external clock or refresh circuitry?
No-it is a fully asynchronous static RAM with no clock input and zero refresh requirement. All operations are controlled by CE, OE, and WE signal edges. The 6T cell design maintains data indefinitely as long as VCC ≥ 2.0 V and CE is asserted or in standby mode.
How does the automatic power-down feature interact with OE and WE during standby?
When CE is HIGH, the device enters ISB2 mode (500 µA) regardless of OE or WE state-outputs go high-Z, internal arrays power down, and address pins are ignored. OE and WE have no effect on power state unless CE is LOW; their logic levels only determine read/write behavior during active cycles.
CY7C1399B-15ZXC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 28-TSSOP (0.465", 11.80mm Width)
- Packaging:
- Tray
- 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:
- 3V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSOP I
CY7C1399B-15ZXC FAQ
1.How can I place an order for CY7C1399B-15ZXC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C1399B-15ZXC 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 CY7C1399B-15ZXC reliable?
The price and inventory of CY7C1399B-15ZXC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C1399B-15ZXC is usually 5 days.
3.What payment methods are accepted for CY7C1399B-15ZXC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C1399B-15ZXC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C1399B-15ZXC?
CY7C1399B-15ZXC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C1399B-15ZXC 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 CY7C1399B-15ZXC?
For technical support, including CY7C1399B-15ZXC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C1399B-15ZXC requirements.
6.How does Aetrix verify that CY7C1399B-15ZXC is sourced from the original manufacturer or authorized distributors?
All CY7C1399B-15ZXC 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 CY7C1399B-15ZXC meets industry standards.
7.What is the process for return or replacement of CY7C1399B-15ZXC?
All CY7C1399B-15ZXC units undergo pre-shipment inspection (PSI). If there is an issue with CY7C1399B-15ZXC, 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 CY7C1399B-15ZXC part is unused and in its original packaging.
Return procedure for CY7C1399B-15ZXC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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