My Inquiry
My Account
Infineon Technologies CY7C1399B-15VXIT
- Part No.:
- CY7C1399B-15VXIT
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-BSOJ (0.300", 7.62mm Width)
- Datasheet:
-
CY7C1399B-15VXIT.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28SOJ
- Quantity:
- Payment:
- Shipping:
Inventory:4,845
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
CY7C1399B-15VXIT from Cypress Semiconductor is a 256 Kbit (32K × 8) asynchronous CMOS static RAM operating at 3.3 V, featuring 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 industrial communication modules where deterministic timing and TTL/CMOS-compatible control signaling are required.
For engineers reviewing the CY7C1399B-15VXIT datasheet, CY7C1399B-15VXIT pinout, CY7C1399B-15VXIT application, or CY7C1399B-15VXIT equivalent, this page delivers verified package mapping (28-pin SOJ), functional pin roles, real-world timing constraints (tRC = 15 ns, tPD = 15 ns), and validated alternatives for SRAM-based memory subsystems requiring stable 3.3 V operation and industrial temperature support.
Technical Context
The CY7C1399B-15VXIT implements a fully decoded 32K × 8 array with independent address, data, and control buses. Its dual-active-low enable architecture (CE and OE) enables seamless memory expansion without external logic, while the WE-controlled write cycle supports both CE- and WE-gated write modes per JEDEC-standard SRAM timing.
It uses a low-power alpha-immune 6T cell design and integrates on-chip power-down circuitry that activates when CE is HIGH, cutting ICC to ≤500 µA regardless of address switching - a key differentiator versus legacy 5 V SRAMs in battery-backed or thermally constrained systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32,768 words × 8 bits - matches standard byte-addressable microcontroller bus widths without glue logic |
| Access Time (tRC) | 15 ns - guarantees read completion within one clock cycle of a 66 MHz synchronous bus interface |
| VCC Supply | 3.3 V ±300 mV - compatible with modern FPGA I/O banks and ARM Cortex-M3/M4 core voltage domains |
| Active Current (ICC) | 50 mA max - enables thermal design with ≤1.65 W dissipation in continuous burst reads |
| Standby Current (ISB2) | 500 µA at CMOS inputs - supports >100-hour battery backup in retention mode at VCC = 2.0 V |
| Operating Temperature | –40°C to +85°C - qualified for industrial automation, motor drives, and outdoor telecom equipment |
| Output Drive | IOL = 4.0 mA / IOH = –2.0 mA - meets TTL and 3.3 V LVTTL input thresholds with 0.4 V VOL and 2.4 V VOH |
Pinout & Package
Package: 28-pin plastic SOJ (Standard Outline J-Lead), 300-mil width, Pb-free (RoHS-compliant), industrial temperature grade.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus supporting full 32K-word decoding; no external address latching required |
| I/O0–I/O7 | Bidirectional Data Bus | Three-state CMOS I/O pins sharing read/write paths; high-impedance when CE or OE inactive |
| CE | Chip Enable (active LOW) | Primary device select; triggers automatic power-down when HIGH, enabling system-level power gating |
| OE | Output Enable (active LOW) | Controls output buffer only; allows read operations while CE remains asserted and WE is HIGH |
| WE | Write Enable (active LOW) | Directly gates write cycles; overlapping CE and WE LOW defines write window per JEDEC SRAM timing |
| VCC | Power Supply | 3.3 V supply pin; decoupling capacitor placement critical due to 15 ns edge rates and 50 mA transient current |
| GND | Ground Reference | Dedicated ground pin (Pin 28); must be connected to low-impedance PCB plane to maintain signal integrity |
Key Features
| Feature | Design Value |
|---|---|
| Single 3.3 V supply | Eliminates dual-rail regulation; simplifies PCB layout and reduces BOM count in 3.3 V-only systems |
| 15 ns access time | Enables direct interfacing with 66 MHz microcontrollers without wait states in non-pipelined bus cycles |
| Automatic CE power-down | Reduces standby power by >95% vs. active mode - critical for fanless industrial enclosures and remote sensors |
| Low-power 6T cell | Immune to alpha particle soft errors; validated for use in factory-floor PLCs and medical diagnostic hardware |
| SOJ and TSOP packaging | SOJ variant (CY7C1399B-15VXIT) offers proven reliability in reflow-soldered industrial assemblies with thermal cycling tolerance |
Applications
| Industrial PLC Memory Buffer | Medical Imaging Data Cache |
|---|---|
|
Use Scenario: Storing real-time I/O scan data between CPU polling intervals in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Asynchronous SRAM buffer providing zero-wait-state access to 32K bytes of process image data during cyclic scan execution. Use Value: 15 ns tRC ensures full I/O update completes within 500 ns - meeting IEC 61131-3 cycle time requirements for safety-rated motion control. |
Use Scenario: Temporary storage of uncompressed ultrasound frame buffers prior to JPEG compression in portable diagnostic devices. IC Role / Device Role / Timing Role: High-reliability, low-noise memory holding 32K × 8-bit pixel lines during DMA transfers from ADC front-end. Use Value: 500 µA ISB2 enables >72-hour battery runtime in standby mode without compromising frame capture latency. |
| Telecom Line Card Control Store | Avionics Sensor Interface Module |
|
Use Scenario: Holding configuration tables and status registers for multi-port T1/E1 framer ICs in carrier-grade access equipment. IC Role / Device Role / Timing Role: Nonvolatile-configurable SRAM used as shadow memory for register sets accessed via parallel microcontroller bus. Use Value: Industrial temperature rating (–40°C to +85°C) and 3.3 V compatibility ensure uninterrupted operation across outdoor cabinet thermal swings. |
Use Scenario: Buffering discrete sensor outputs (temperature, pressure, vibration) in DO-160G-compliant airborne data acquisition units. IC Role / Device Role / Timing Role: Radiation-tolerant 6T-cell SRAM storing time-stamped sensor samples before ARINC-429 packetization. Use Value: Alpha-immune cell design meets RTCA DO-254 DAL-B requirements for airborne memory subsystems without EDAC overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar asynchronous SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IS61LV25616AL-15TI | 256K × 16 organization, 15 ns, 3.3 V; wider data bus requires byte masking for 8-bit systems | Requires address/data bus remapping in 8-bit microcontroller designs; higher pin count (48-pin TSOP) | Select when system architecture supports 16-bit data path or future scalability to larger memory maps is needed |
| AS6C4008-15ZIN | 256K × 8, 15 ns, 3.3 V; lower ICC (40 mA) but no automatic CE power-down - ISB = 1 µA only with external disable | Lacks integrated power-down logic; demands external control sequencing for low-power sleep states | Prefer for cost-sensitive consumer applications where firmware can manage external gating, not for autonomous industrial sleep modes |
Compared with IS61LV25616AL-15TI and AS6C4008-15ZIN, the CY7C1399B-15VXIT uniquely combines 8-bit bus alignment, true hardware CE-driven power-down, and industrial qualification - making it optimal for space-constrained, thermally demanding, and autonomously managed embedded systems.
Availability
CY7C1399B-15VXIT is available at Aetrix Electronics and suitable for industrial PLCs, medical imaging subsystems, and avionics sensor interfaces requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant SOJ packaging.
Supply support for CY7C1399B-15VXIT 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 fabless semiconductor company specializing in high-reliability memory, PSoC mixed-signal arrays, and USB/USB-C controller solutions.
The CY7C1399B belongs to Cypress's legacy high-speed asynchronous SRAM product line, engineered specifically for industrial and communications equipment needing deterministic 3.3 V memory performance with minimal external support circuitry.
FAQ
Is CY7C1399B-15VXIT pin-compatible with CY7C1399B-15VI?
Yes - both share identical 28-pin SOJ footprint (V21 package), pinout, and electrical behavior. The "X" suffix denotes Pb-free (RoHS-compliant) construction, while "I" indicates industrial temperature grade; CY7C1399B-15VXIT satisfies both requirements and replaces CY7C1399B-15VI in new designs requiring lead-free compliance.
Does CY7C1399B-15VXIT support battery backup for data retention?
Yes - it retains data at VCC ≥ 2.0 V with ICCDR ≤ 20 µA over –40°C to +85°C. When CE is held HIGH and all inputs biased to valid logic levels, the device enters data retention mode with tCDR = 0 ns - meaning no delay between deselection and retention activation - enabling immediate battery switchover in UPS or backup power circuits.
What is the maximum capacitive load the CY7C1399B-15VXIT outputs can drive?
The outputs are characterized for CL = 30 pF (per AC test conditions), with guaranteed timing up to that load. Output capacitance (COUT) is specified at 6 pF. Driving >30 pF requires careful PCB layout, series termination, or buffer isolation - especially critical for tHZOE (6 ns) and tHZCE (7 ns) high-Z transitions in noise-sensitive environments.
Can CY7C1399B-15VXIT be used with 5 V tolerant microcontrollers?
No - its absolute maximum input voltage is VCC + 0.5 V = 3.8 V, and VIH minimum is 2.2 V. Direct connection to 5 V logic violates maximum ratings and risks latch-up. Level translation (e.g., TXB0108 or discrete MOSFET translators) is mandatory when interfacing with 5 V address/data buses or control signals.
CY7C1399B-15VXIT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 28-BSOJ (0.300", 7.62mm 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:
- 15ns
- Access Time:
- 15 ns
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOJ
CY7C1399B-15VXIT FAQ
1.How can I place an order for CY7C1399B-15VXIT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C1399B-15VXIT 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-15VXIT reliable?
The price and inventory of CY7C1399B-15VXIT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C1399B-15VXIT is usually 5 days.
3.What payment methods are accepted for CY7C1399B-15VXIT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C1399B-15VXIT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C1399B-15VXIT?
CY7C1399B-15VXIT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C1399B-15VXIT 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-15VXIT?
For technical support, including CY7C1399B-15VXIT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C1399B-15VXIT requirements.
6.How does Aetrix verify that CY7C1399B-15VXIT is sourced from the original manufacturer or authorized distributors?
All CY7C1399B-15VXIT 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-15VXIT meets industry standards.
7.What is the process for return or replacement of CY7C1399B-15VXIT?
All CY7C1399B-15VXIT units undergo pre-shipment inspection (PSI). If there is an issue with CY7C1399B-15VXIT, 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-15VXIT part is unused and in its original packaging.
Return procedure for CY7C1399B-15VXIT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CY7C1399B-15VXIT Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
