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Infineon Technologies CY7C1399B-12ZXCT
- Part No.:
- CY7C1399B-12ZXCT
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
CY7C1399B-12ZXCT.pdf
- Description:
- IC SRAM 256KBIT PAR 28TSOP I
- Quantity:
- Payment:
- Shipping:
Inventory:2,148
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Product details
Overview
CY7C1399B-12ZXCT from Cypress Semiconductor is a 256 Kbit (32K × 8) asynchronous CMOS static RAM operating at 3.3 V, featuring 12 ns access time, 55 mA max active current, and automatic CE-controlled power-down reducing standby current to 500 µA. It serves as low-voltage cache or buffer memory in embedded controllers and networking interface modules where deterministic timing and TTL/CMOS-compatible control signaling are required.
For engineers reviewing the CY7C1399B-12ZXCT datasheet, CY7C1399B-12ZXCT pinout, CY7C1399B-12ZXCT application, or CY7C1399B-12ZXCT equivalent, this page delivers verified package mapping (28-pin TSOP Type I), confirmed pin functions, real-world timing behavior (tRC = 12 ns, tHZOE = 5 ns), and validated alternatives for SRAM replacement in industrial-grade 3.3V systems.
Technical Context
The CY7C1399B-12ZXCT implements a fully decoded 32K × 8 array with independent address, data, and control buses. Its dual-active-Low CE and OE enable hierarchical memory expansion, while WE controls read/write direction without requiring external latches or clocks.
It uses a low-power alpha-immune 6T cell architecture and supports two standby modes: ISB1 (5 mA, TTL input thresholds) and ISB2 (500 µA, CMOS input thresholds), triggered solely by CE high with no additional control signals needed.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32,768 words × 8 bits - matches standard byte-addressable bus interfaces without bit-width conversion logic |
| Access Time (tRC) | 12 ns - guarantees sub-83 MHz synchronous bus operation with setup/hold margin |
| VCC Supply | 3.3 V ± 300 mV - compatible with modern low-voltage FPGA and microcontroller I/O rails |
| Active Current (ICC) | 55 mA max - enables thermal design for dense PCB layouts with ≤1.8 W per device at full activity |
| Standby Current (ISB2) | 500 µA - allows battery-backed retention in always-on industrial monitoring nodes |
| Data Retention Voltage | 2.0 V min - supports graceful degradation during brown-out conditions without data loss |
| Output Drive | IOH = –2.0 mA / IOL = 4.0 mA - directly interfaces with 3.3V LVTTL and LVCMOS inputs |
Pinout & Package
Package: 28-pin Thin Small Outline Package (TSOP Type I), 8.8 mm × 10.2 mm body, 0.55 mm pitch, Pb-free (RoHS compliant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus supporting full 32K-word decoding; no external address latch required |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit multiplexed data path with three-state outputs controlled by CE/OE/WE logic |
| CE | Chip Enable (active LOW) | Primary selection signal; initiates automatic power-down when HIGH, independent of other controls |
| OE | Output Enable (active LOW) | Enables output drivers only when CE is LOW; prevents bus contention during write cycles |
| WE | Write Enable (active LOW) | Determines data direction: LOW = write, HIGH = read; overlaps with CE to define write window |
| VCC | Power Supply | 3.3 V supply pin; decoupling capacitor placement critical due to 12 ns edge rates |
| GND | Ground Reference | Single ground pin; layout requires low-inductance return path to minimize switching noise |
Key Features
| Feature | Design Value |
|---|---|
| Automatic CE Power-Down | Reduces ICC from 55 mA to 500 µA instantly on CE deassertion-no software or timing overhead |
| Low-Power 6T Cell | Immune to alpha particle-induced soft errors in industrial environments without added ECC logic |
| TTL/CMOS Input Compatibility | VIH = 2.2 V min / VIL = 0.8 V max ensures robust interfacing with mixed-voltage system controllers |
| Three-State Output Control | Simultaneous control via CE, OE, and WE eliminates need for external bus transceivers in multi-SRAM systems |
| Industrial Temperature Range | –40°C to +85°C operation validated across full voltage and timing specs-no derating required |
Applications
| Industrial PLC Memory Buffer | Network Switch Packet Buffer |
|---|---|
|
Use Scenario: Storing transient packet headers and metadata in Layer 2 Ethernet switches with deterministic latency requirements. IC Role / Device Role / Timing Role: Asynchronous 8-bit data buffer providing 12 ns read/write turnaround for backplane interface arbitration logic. Use Value: Eliminates wait states in store-and-forward architectures due to guaranteed tRC ≤ 12 ns and zero-cycle bus release (tHZOE = 5 ns). |
Use Scenario: Holding configuration registers and I/O status maps in programmable logic controller (PLC) CPU modules. IC Role / Device Role / Timing Role: Nonvolatile-cached SRAM used for fast register access between ARM Cortex-M4 core and fieldbus peripherals. Use Value: Enables direct-mapped access without glue logic; ISB2 mode sustains data at 500 µA during sleep cycles between scan intervals. |
| Medical Imaging Frame Store | Automotive ADAS Preprocessing Buffer |
|
Use Scenario: Temporary storage of digitized ultrasound scan lines prior to DSP-based beamforming. IC Role / Device Role / Timing Role: High-reliability frame buffer interfacing with 3.3V ADCs and FPGA-based correlators. Use Value: Alpha-immune 6T cell structure ensures data integrity during extended operation in radiation-prone diagnostic environments. |
Use Scenario: Buffering camera sensor output in rear-view and surround-view ECUs before H.264 encoding. IC Role / Device Role / Timing Role: Low-latency pixel-line buffer synchronized to MIPI CSI-2 clock domain via discrete control logic. Use Value: 3.3V compatibility and –40°C to +85°C rating allow direct integration into automotive junction boxes without level-shifting. |
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-12TLI | 3.3V, 256K × 16 organization, 12 ns, 32-pin TSOP; wider data bus, higher density per pin count | Requires bus-width adaptation (16-bit vs. 8-bit); better suited for memory-constrained MCU designs with parallel external memory interfaces | Select when system bus width is 16-bit and board space is constrained; verify address/data multiplexing compatibility |
| ON Semiconductor MC14LC5481DW | 5V-only, 64K × 8, 15 ns, SOIC-28; incompatible supply and slower timing | Legacy 5V systems only; not drop-in replaceable due to voltage and speed mismatch | Consider only for backward-compatible repairs in discontinued 5V industrial hardware; not recommended for new designs |
Compared with IS61LV25616AL-12TLI and MC14LC5481DW, the CY7C1399B-12ZXCT offers native 8-bit bus alignment, lower active power (55 mA vs. ≥70 mA), and guaranteed industrial temperature support without derating-making it optimal for compact, low-power, 3.3V embedded buffers.
Availability
CY7C1399B-12ZXCT is available at Aetrix Electronics and suitable for industrial PLCs, network switch buffers, medical imaging subsystems, and automotive ADAS preprocessing modules requiring stable component supply across extended product lifecycles.
Supply support for CY7C1399B-12ZXCT 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 infrastructure markets.
The CY7C1399B belongs to Cypress's legacy asynchronous SRAM product line, engineered specifically for low-voltage, low-latency buffering in real-time embedded systems where predictability and radiation tolerance are critical.
FAQ
Is CY7C1399B-12ZXCT pin-compatible with CY7C1399B-12VC?
Yes-both share identical 28-pin TSOP Type I (Z28) and SOJ (V21) footprints and pinouts. The -12ZXCT variant is the Pb-free, industrial-temperature version of the same die; all signal assignments, power, and ground pins match exactly. No PCB redesign is needed when migrating from commercial to industrial grade.
Does CY7C1399B-12ZXCT require an external clock signal?
No-it is a fully asynchronous SRAM with no clock input. All operations are controlled by edge-triggered CE, OE, and WE signals. Timing is governed solely by propagation delays (e.g., tRC = 12 ns, tAA = 12 ns); no clock tree or synchronization logic is required for integration.
What is the maximum data retention voltage for CY7C1399B-12ZXCT?
The minimum VCC for guaranteed data retention is 2.0 V, as specified in the Data Retention Characteristics table. At this voltage, ICCDR remains ≤20 µA across the industrial temperature range, enabling battery-assisted hold functionality during main supply interruption.
Can CY7C1399B-12ZXCT be used with 5V-tolerant microcontrollers?
Yes-its inputs accept VIH up to VCC + 0.3 V (3.6 V max) and VIL down to –0.3 V, making it safe for direct connection to 5V-tolerant GPIOs configured for 3.3V logic levels. However, outputs swing only to 2.4 V VOH (at IOH = –2 mA), so level-shifting may be needed for strict 5V input thresholds.
CY7C1399B-12ZXCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 28-TSSOP (0.465", 11.80mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 12ns
- Access Time:
- 12 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-12ZXCT FAQ
1.How can I place an order for CY7C1399B-12ZXCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C1399B-12ZXCT 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-12ZXCT reliable?
The price and inventory of CY7C1399B-12ZXCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C1399B-12ZXCT is usually 5 days.
3.What payment methods are accepted for CY7C1399B-12ZXCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C1399B-12ZXCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C1399B-12ZXCT?
CY7C1399B-12ZXCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C1399B-12ZXCT 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-12ZXCT?
For technical support, including CY7C1399B-12ZXCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C1399B-12ZXCT requirements.
6.How does Aetrix verify that CY7C1399B-12ZXCT is sourced from the original manufacturer or authorized distributors?
All CY7C1399B-12ZXCT 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-12ZXCT meets industry standards.
7.What is the process for return or replacement of CY7C1399B-12ZXCT?
All CY7C1399B-12ZXCT units undergo pre-shipment inspection (PSI). If there is an issue with CY7C1399B-12ZXCT, 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-12ZXCT part is unused and in its original packaging.
Return procedure for CY7C1399B-12ZXCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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