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NXP Semiconductors SC16IS740IPW,128
- Part No.:
- SC16IS740IPW,128
- Manufacturer:
- NXP Semiconductors
- Category:
- Controllers
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SC16IS740IPW,128.pdf
- Description:
- IC UART SINGLE W/FIFO 16-TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:16,276
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Product details
Overview
SC16IS740IPW,128 from NXP Semiconductors is a single-channel UART IC with I²C-bus or SPI host interface, 64-byte TX/RX FIFOs, IrDA SIR support (up to 115.2 kbit/s), and full 16C450 register compatibility. It operates at 2.5 V or 3.3 V, supports baud rates up to 5 Mbit/s, and targets low-power embedded systems requiring protocol bridging between microcontrollers and RS-232/RS-485 peripherals.
For engineers reviewing the SC16IS740IPW,128 datasheet, SC16IS740IPW,128 pinout, SC16IS740IPW,128 application, or SC16IS740IPW,128 equivalent, this device delivers deterministic serial bridging in space-constrained, battery-operated designs - especially where legacy UART software porting, hardware flow control, or automatic RS-485 direction management are required.
Technical Context
The SC16IS740IPW,128 implements a fully programmable UART core with dual 64-byte FIFOs, selectable I²C (400 kbit/s) or SPI (4 Mbit/s) host interface, and integrated IrDA encoder/decoder. Its register set mirrors the 16C450, enabling drop-in software reuse across platforms without driver rewrite.
It supports auto RTS/CTS hardware flow control, automatic RS-485 half-duplex direction control via RTS, and software reset independent of external RESET pin. Unlike SC16IS750/760, it omits GPIO pins - confirmed by TSSOP16 pinout and datasheet functional exclusions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Interface | Selectable I²C-bus (400 kbit/s) or SPI (4 Mbit/s); no GPIOs - dedicated TSSOP16 footprint. |
| FIFO depth | 64-byte transmit and receive buffers - reduces host CPU interrupt load and prevents overrun in burst traffic. |
| Baud rate max | 5 Mbit/s in 16× clock mode - supports high-speed industrial serial links without oversampling penalty. |
| Supply voltage | 2.5 V or 3.3 V operation - compatible with modern low-voltage MCUs and mixed-voltage system design. |
| IrDA SIR speed | Up to 115.2 kbit/s - enables infrared data exchange in portable diagnostics and handheld terminals. |
| Operating temp | −40 °C to +95 °C - qualified for industrial automation and factory-floor deployment. |
| Sleep current | <30 μA at 3.3 V - extends battery life in always-on sensor gateways and remote telemetry units. |
Pinout & Package
TSSOP16 package (SOT403-1), 4.4 mm body width, 0.65 mm pitch; thermally enhanced for compact PCB layouts in handheld and portable equipment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VDD | Power supply | 3.3 V or 2.5 V main supply; requires local decoupling near pin. |
| 2 A0 / CS | I²C address select / SPI chip select | Configures I²C base address (with A1) or enables SPI communication when pulled LOW. |
| 3 A1 / SI | I²C address select / SPI data input | Second I²C address bit; in SPI mode, receives command/data from host MCU. |
| 4 SO | SPI data output | 3-stateable output; undefined in I²C mode - must be left unconnected. |
| 5 SCL / SCLK | I²C clock / SPI clock | Input for synchronous serial interface; Schmitt-triggered for noise immunity. |
| 6 SDA | I²C bidirectional data | Open-drain I²C bus line; must be pulled up externally (1 kΩ @ 3.3 V). |
| 7 IRQ | Interrupt request | Open-drain active-LOW signal indicating RX/TX/FIFO/error events - requires external pull-up. |
| 8 I2C/SPI | Interface select | HIGH = I²C mode; LOW = SPI mode - sets internal logic path at power-up. |
| 9 VSS | Ground | Digital ground reference; must be connected to PCB ground plane. |
| 10 RTS | UART request-to-send output | Active-LOW RTS; used for hardware flow control or automatic RS-485 driver direction. |
| 11 CTS | UART clear-to-send input | Active-LOW CTS; enables auto-transmit gating when hardware flow control is enabled. |
| 12 TX | UART transmitter output | CMOS-level serial output; connects to line driver (e.g., MAX3232) for RS-232 or RS-485 transceivers. |
| 13 RX | UART receiver input | CMOS-level serial input; accepts TTL/CMOS logic levels directly from peripheral UARTs or transceivers. |
| 14 RESET | Hardware reset input | Active-LOW asynchronous reset; initializes registers and forces TX/RTS HIGH on release. |
| 15 XTAL1 | Clock input | Accepts crystal (1–25 MHz) or external clock source; determines UART timing accuracy and max baud rate. |
| 16 XTAL2 | Clock output | Crystal oscillator output; connects to XTAL1 to form Pierce oscillator circuit. |
Key Features
| Feature | Design Value |
|---|---|
| 16C450 register compatibility | Enables direct porting of legacy UART drivers - no firmware modification needed for register access or initialization sequence. |
| Auto RTS/CTS hardware flow control | Eliminates RX FIFO overrun and TX underrun in high-throughput serial links without CPU polling or timer-based handshaking. |
| Automatic RS-485 direction control | Uses RTS signal to toggle driver enable - removes need for external logic or GPIO-controlled direction pin in half-duplex bus systems. |
| Programmable character format | Supports 5–8-bit words, even/odd/no parity, and 1/1.5/2 stop bits - interoperates with legacy modems, PLCs, and industrial sensors. |
| Software reset capability | Allows full UART reinitialization via register write - avoids board-level reset assertion and maintains system-level continuity. |
Applications
| Industrial Serial Gateway | Portable Diagnostic Tool |
|---|---|
Use Scenario: Connecting ARM Cortex-M host to legacy RS-485 field devices (PLCs, sensors) over I²C in a DIN-rail mounted gateway. IC Role / Device Role / Timing Role: Protocol bridge converting I²C commands from MCU into RS-485 UART frames; manages RTS-driven bus direction and auto-flow control. Use Value: Enables deterministic, low-latency serial communication without dedicating MCU GPIOs or UART peripherals - preserves host resources for real-time control tasks. |
Use Scenario: Handheld medical or automotive diagnostic unit using battery power and requiring infrared (IrDA) and wired serial connectivity. IC Role / Device Role / Timing Role: Single-chip UART with integrated IrDA encoder/decoder and low sleep current - handles both wired (TX/RX/RTS/CTS) and IR physical layers. Use Value: Reduces BOM count and PCB area while supporting dual-interface field service - IrDA at 115.2 kbit/s meets ISO 15765-2 diagnostic transport requirements. |
| Factory Automation Controller | Smart Energy Meter Interface |
Use Scenario: Embedded controller in a programmable logic controller (PLC) communicating with HMI panels and motor drives via RS-232/RS-485. IC Role / Device Role / Timing Role: High-reliability UART with 64-byte FIFOs and hardware flow control - absorbs burst traffic from multiple serial peripherals without packet loss. Use Value: Guarantees error-free data transfer under electromagnetic noise in factory environments - LSR error flags and FIFO level registers simplify diagnostics. |
Use Scenario: AMI (Advanced Metering Infrastructure) meter with MCU using SPI to manage multiple utility communication interfaces (M-Bus, DLMS over RS-485). IC Role / Device Role / Timing Role: SPI-to-UART bridge with automatic RS-485 direction control - eliminates external direction logic and simplifies layout in sealed meter enclosures. Use Value: Supports long cable runs (up to 1200 m) and ESD-robust operation per IEC 61000-4-2 - critical for outdoor utility deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar UART bridge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SC16IS750IPW | Includes 8 GPIOs; TSSOP24 package; same UART core, I²C/SPI, FIFOs, and IrDA (115.2 kbit/s) | Required when system needs additional I/O for status LEDs, button inputs, or peripheral control alongside UART bridging | Select SC16IS750IPW only if GPIO expansion is mandatory - adds 8 pins but increases PCB footprint and complexity |
| MAX3107ETJ+ | 3.3 V only; SPI-only interface; 128-byte FIFOs; no IrDA; higher sleep current (~100 μA) | Preferred in high-noise environments where SPI isolation is preferred over I²C, or where larger FIFOs reduce interrupt frequency | Choose MAX3107ETJ+ when IrDA is unnecessary and deeper buffering justifies trade-off in power and interface flexibility |
Compared with SC16IS750IPW and MAX3107ETJ+, the SC16IS740IPW,128 offers the smallest footprint (TSSOP16), lowest sleep current, and dual I²C/SPI flexibility - making it optimal for size- and power-constrained UART bridging where GPIOs are not needed.
Availability
SC16IS740IPW,128 is available at Aetrix Electronics and suitable for industrial serial gateways, portable diagnostic tools, factory automation controllers, and smart energy meter interfaces requiring stable component supply and long-term production support.
Supply support for SC16IS740IPW,128 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
NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications - delivering high-integrity silicon with comprehensive ecosystem support.
The SC16IS740IPW,128 belongs to NXP's SC16IS7xx UART bridge family, designed specifically to simplify protocol conversion between modern microcontrollers and legacy serial peripherals in resource-constrained embedded systems.
FAQ
What interface modes does the SC16IS740IPW,128 support?
The SC16IS740IPW,128 supports two mutually exclusive host interface modes: I²C-bus (up to 400 kbit/s) and SPI (up to 4 Mbit/s). Selection is controlled by the I2C/SPI pin (pin 8): HIGH enables I²C, LOW enables SPI. The SC16IS740IPW,128 does not support simultaneous or auto-switching between interfaces - configuration is fixed at power-up.
Does the SC16IS740IPW,128 include GPIO functionality?
No, the SC16IS740IPW,128 does not include GPIO pins. Unlike the SC16IS750 and SC16IS760 variants, the SC16IS740IPW,128 is functionally identical except for the omission of all eight programmable I/O pins - confirmed by its TSSOP16 pinout (16 pins vs. 24) and explicit datasheet statements.
What is the maximum baud rate supported by the SC16IS740IPW,128?
The SC16IS740IPW,128 supports baud rates up to 5 Mbit/s in 16× sampling mode. This requires a minimum clock input of 80 MHz (5 Mbit/s × 16) at XTAL1. With standard crystals (e.g., 1.8432 MHz), max baud is 115.2 kbit/s; higher rates require external clock sources or faster crystals.
How does automatic RS-485 direction control work on the SC16IS740IPW,128?
The SC16IS740IPW,128 uses its RTS output (pin 10) to automatically control RS-485 driver direction. When enabled via the Enhanced Feature Register, RTS asserts LOW during transmission and deasserts HIGH afterward - eliminating need for external direction logic. This feature is fully compatible with standard RS-485 transceivers like SN65HVD72.
Is the SC16IS740IPW,128 compatible with legacy 16C450 software drivers?
Yes, the SC16IS740IPW,128 implements a register map fully backward-compatible with the industry-standard 16C450 UART. All control, status, divisor latch, and FIFO registers match bit-for-bit - allowing existing drivers to initialize, configure, and operate the SC16IS740IPW,128 without modification.
SC16IS740IPW,128 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Programmable:
- Not Verified
- Protocol:
- RS232, RS485
- Function:
- Controller
- Interface:
- I2C, SPI, UART
- Standards:
- -
- Voltage - Supply:
- 2.5V, 3.3V
- Current - Supply:
- 6mA
- Operating Temperature:
- -40°C ~ 95°C
- Supplier Device Package:
- 16-TSSOP
- Grade:
- -
- Qualification:
- -
SC16IS740IPW,128 FAQ
1.How can I place an order for SC16IS740IPW,128 through Aetrix?
Please submit a Request for Quotation (RFQ) for SC16IS740IPW,128 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 SC16IS740IPW,128 reliable?
The price and inventory of SC16IS740IPW,128 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC16IS740IPW,128 is usually 5 days.
3.What payment methods are accepted for SC16IS740IPW,128?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC16IS740IPW,128 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC16IS740IPW,128?
SC16IS740IPW,128 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC16IS740IPW,128 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 SC16IS740IPW,128?
For technical support, including SC16IS740IPW,128 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC16IS740IPW,128 requirements.
6.How does Aetrix verify that SC16IS740IPW,128 is sourced from the original manufacturer or authorized distributors?
All SC16IS740IPW,128 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 SC16IS740IPW,128 meets industry standards.
7.What is the process for return or replacement of SC16IS740IPW,128?
All SC16IS740IPW,128 units undergo pre-shipment inspection (PSI). If there is an issue with SC16IS740IPW,128, 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 SC16IS740IPW,128 part is unused and in its original packaging.
Return procedure for SC16IS740IPW,128:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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