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NXP Semiconductors SC16C750BIB64,157
- Part No.:
- SC16C750BIB64,157
- Manufacturer:
- NXP Semiconductors
- Package:
- 64-LQFP
- Datasheet:
-
SC16C750BIB64,157.pdf
- Description:
- IC UART 64BYTE 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,330
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Product details
Overview
SC16C750BIB64 from NXP Semiconductors is a single-channel, 5 V / 3.3 V / 2.5 V universal asynchronous receiver/transmitter (UART) IC used for serial data interface in embedded host systems. It delivers up to 3 Mbit/s data rate at 5 V, features 64-byte transmit and receive FIFOs, automatic hardware flow control (RTS/CTS), and supports industrial temperature range (−40 °C to +85 °C). It serves as a drop-in upgrade for legacy 16C450/550 designs in industrial controllers and communication gateways.
For engineers reviewing the SC16C750BIB64 datasheet, SC16C750BIB64 pinout, SC16C750BIB64 application, or SC16C750BIB64 equivalent, key selection criteria include FIFO depth (64-byte), multi-voltage operation (2.5/3.3/5 V), auto-RTS/CTS implementation, DMA-ready TXRDY/RXRDY signaling, and LQFP64 package compatibility with existing 16C750 footprint layouts.
Technical Context
The SC16C750BIB64 implements a fully programmable UART core with independent transmitter and receiver sections, each synchronized by a 16× baud-rate clock derived from XTAL1 or external RCLK. Its register set-compatible with 16C450 on power-up-enables configuration of character format (5–8 bits, 1/1.5/2 stop bits, parity), baud rate (via 16-bit DLL/DLM divisor), and interrupt priority levels.
FIFO operation is controlled via FCR[0], supporting four selectable receive trigger levels (1/16/32/56 bytes) and time-out detection (4 character times). Hardware flow control is implemented through dedicated CTS input monitoring and RTS output assertion logic, configurable via MCR[5] and MCR[1], with no software polling required in auto-RTS/CTS mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.5 V, 3.3 V, or 5 V ±10 % - enables direct integration into mixed-voltage industrial PCBs without level-shifting. |
| Max Data Rate | 3 Mbit/s at 5 V (with 48 MHz clock) - supports high-speed modem and ISDN interfaces requiring >115.2 kbit/s input rates. |
| FIFO Depth | 64-byte TX + 64-byte RX - reduces CPU interrupt load by ~75% vs. 16-byte FIFO (16C550) and eliminates byte-by-byte polling in burst transfers. |
| Operating Temp | −40 °C to +85 °C - qualified for industrial automation, transportation, and outdoor communications equipment. |
| Interface Logic | 3-state TTL-compatible bus I/O (D0–D7, IOR/IOW, CS0–CS2, A0–A2) - directly interfaces with 8-bit microcontrollers and FPGA bus masters. |
| Flow Control | Programmable auto-RTS and auto-CTS - hardware-managed serial flow prevents buffer overflow without CPU intervention during FIFO mode. |
| Interrupt System | Priority-encoded INT output with independent enable for RX/TX/line/modem events - simplifies ISR design in real-time OS environments. |
Pinout & Package
LQFP64 package (10 × 10 × 1.4 mm, SOT314-2), lead-free, RoHS-compliant, with exposed thermal pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0–D7 | Data Bus I/O | Bidirectional 8-bit parallel interface to CPU/FPGA; 3-state outputs allow shared bus operation. |
| A0–A2 | Register Address Select | Selects among 12 internal registers (THR/RHR, IER, FCR, LCR, MCR, etc.) using standard 16C450 addressing map. |
| IOR / IOW | Read/Write Strobe | Active-low (IOR) and active-high (IOW) control signals - compatible with Intel-style bus timing. |
| CS0–CS2 | Chip Select Inputs | 3-input decode enables device selection in multi-peripheral systems; AS pin allows address latching. |
| TX / RX | Serial I/O | Asynchronous TTL-level transmit output and receive input; supports RS-232/RS-485 transceivers via external drivers. |
| RTS / CTS | Hardware Flow Control | RTS output and CTS input pins directly managed by internal flow control logic in auto-mode - no GPIO or firmware overhead. |
| TXRDY / RXRDY | DMA Ready Signals | Open-drain outputs indicate FIFO readiness for DMA transfer; support both single- and multi-transfer DMA modes (FCR[3]). |
| INT | Interrupt Output | Active-high, prioritized interrupt signal - asserts for RX data ready, TX empty, line error, or modem status change. |
| RESET | Master Reset | Active-high asynchronous reset - initializes all registers to 16C450-compatible state and sets default I/O levels. |
| XTAL1 / XTAL2 | Crystal Oscillator Interface | Supports 1.8432 MHz to 48 MHz crystal or external clock; XTAL2 is output when crystal-driven, input when external clock used. |
Key Features
| Feature | Design Value |
|---|---|
| 64-byte dual FIFOs | Enables burst-mode serial transfers with <100 µs CPU servicing interval - critical for deterministic real-time response in PLC backplanes. |
| Auto-RTS/CTS flow control | Eliminates software-based XON/XOFF handling and prevents data loss during high-throughput transfers (e.g., GPS + cellular telemetry streams). |
| Multi-voltage operation | Single BOM item supports 2.5 V, 3.3 V, and 5 V host systems - reduces inventory complexity across product families. |
| Sleep & Low Power modes | Reduces quiescent current to <100 µA (Sleep) or ~1 mA (Low Power) - extends battery life in portable diagnostic tools and remote sensors. |
| Internal loopback diagnostics | Validates TX/RX path integrity without external cabling - accelerates factory test and field firmware updates. |
| 16C450 software compatibility | Runs unmodified legacy drivers and BIOS code - enables seamless migration from obsolete UARTs without OS or driver rework. |
Applications
| Industrial PLC Communication Module | Medical Device Serial Gateway |
|---|---|
Use Scenario: Serial interface between ARM-based controller and legacy RS-232 field devices (sensors, actuators, HMIs) in harsh factory environments. IC Role / Device Role / Timing Role: UART bridge converting parallel bus transactions to asynchronous serial frames with precise start/stop/parity framing. Use Value: 64-byte FIFOs absorb burst traffic from multiple fieldbus nodes; auto-CTS prevents overrun during simultaneous Modbus RTU polling cycles. |
Use Scenario: Secure data aggregation from ECG, SpO₂, and infusion pump peripherals to a central clinical tablet via isolated RS-485. IC Role / Device Role / Timing Role: Isolated UART interface with hardware flow control ensuring zero packet loss during critical patient data streaming. Use Value: Sleep mode cuts standby power to <100 µA - meets IEC 62304 Class C battery life requirements for portable monitors. |
| Telecom Base Station Management | Automotive Diagnostic Tool |
Use Scenario: Out-of-band management port connecting baseband processor to service laptop or SNMP agent over RS-232. IC Role / Device Role / Timing Role: High-reliability UART with false start-bit rejection and complete status reporting for fault-tolerant provisioning. Use Value: 3 Mbit/s capability supports fast firmware upload; TXRDY/RXRDY signals enable zero-wait-state DMA transfers to DDR memory. |
Use Scenario: USB-to-CAN/ISO9141 adapter where SC16C750BIB64 handles protocol translation between USB-UART bridge and vehicle OBD-II bus. IC Role / Device Role / Timing Role: Protocol-agnostic serial interface managing ISO 15765-2 frame segmentation and timing-critical K-line handshaking. Use Value: Programmable baud generator achieves exact 10417 bps (K-line) and 500 kbps (CAN FD) rates using same 48 MHz clock source. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar UART applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Texas Instruments TL16C750IPM | LQFP64, identical pinout and register set; max 2.5 Mbit/s at 5 V; no 2.5 V operation; requires external 1.8432 MHz crystal only. | Best for cost-sensitive 5 V-only designs where 3 Mbit/s headroom and multi-voltage flexibility are not required. | Select TL16C750IPM only if legacy TI ecosystem alignment and lower unit cost outweigh need for 2.5 V support and 3 Mbit/s margin. |
| MaxLinear XR16L788IL64-F | LQFP64, 64-byte FIFOs, 3.3 V only, 5 V tolerant inputs; adds IrDA encoder/decoder and fractional baud rate generator. | Suitable for portable medical or consumer devices needing infrared link capability alongside UART, but lacks 2.5/5 V flexibility. | Choose XR16L788IL64-F when IrDA PHY integration justifies voltage limitation and higher BOM cost. |
Compared with TL16C750IPM and XR16L788IL64-F, the SC16C750BIB64 uniquely combines triple-voltage operation, 3 Mbit/s headroom, and full 16C450 software compatibility - making it optimal for industrial upgrades requiring backward compatibility and future-proof speed scalability.
Availability
SC16C750BIB64 is available at Aetrix Electronics and suitable for industrial PLCs, medical telemetry gateways, telecom management ports, and automotive diagnostic tools requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SC16C750BIB64 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, with deep expertise in mixed-signal interface ICs and long-term product longevity commitments.
The SC16C750BIB64 belongs to NXP's industrial-grade UART family designed specifically for reliable serial communication in harsh environments - emphasizing interoperability, low-power operation, and seamless migration from legacy 16C450/550 platforms.
FAQ
What voltage levels does the SC16C750BIB64 support, and how does that affect system design?
The SC16C750BIB64 operates at 2.5 V, 3.3 V, or 5 V ±10 %, with 5 V tolerance on input-only pins (D0–D7, IOR, IOW, CS0–CS2, A0–A2, RESET, INT). This allows direct integration into mixed-voltage boards without level shifters - for example, interfacing a 3.3 V ARM processor with 5 V legacy peripherals while maintaining signal integrity and reducing BOM count. The SC16C750BIB64 maintains full functionality across all three supply voltages, including identical 3 Mbit/s performance at 5 V and 2 Mbit/s at 3.3 V.
How does the 64-byte FIFO in the SC16C750BIB64 improve system performance compared to older UARTs?
The SC16C750BIB64's 64-byte transmit and receive FIFOs reduce CPU interrupt frequency by up to 75% versus 16-byte FIFOs (e.g., 16C550) and eliminate byte-by-byte polling entirely. In a typical industrial controller handling Modbus RTU at 115.2 kbit/s, this extends interrupt service intervals from ~87 µs to >5.5 ms - freeing CPU cycles for real-time control tasks. The SC16C750BIB64 also supports four programmable receive trigger levels (1/16/32/56 bytes), enabling precise latency-vs.-throughput trade-offs per application.
Can the SC16C750BIB64 replace a 16C450 or 16C550 without hardware or software changes?
Yes - the SC16C750BIB64 powers up in 16C450-compatible mode with identical register mapping and default values, runs all existing 16C450 drivers unmodified, and is pin-compatible with TL16C750 and ST16C450/550. However, to access 64-byte FIFOs, auto-RTS/CTS, or sleep mode, software must write to FCR, MCR, and IER registers. The SC16C750BIB64 thus provides seamless drop-in replacement for legacy systems while enabling incremental feature adoption.
What is the role of TXRDY and RXRDY signals in the SC16C750BIB64, and how are they configured?
TXRDY and RXRDY are open-drain DMA-ready signals indicating FIFO readiness: TXRDY asserts when the transmit FIFO has space, RXRDY asserts when the receive FIFO contains data. Their behavior is controlled by FCR[3] - when cleared, they operate in non-DMA mode (level-sensitive); when set, they support multi-transfer DMA bursts. The SC16C750BIB64 uses these signals to synchronize high-speed data transfers directly with DMA controllers, eliminating CPU polling and enabling zero-wait-state throughput in systems like telecom base station management cards.
Does the SC16C750BIB64 support automatic hardware flow control, and how is it enabled?
Yes - the SC16C750BIB64 supports true automatic RTS/CTS flow control. Auto-CTS is enabled by setting MCR[1] = 1, causing the transmitter to halt immediately upon CTS deassertion (logic 0); auto-RTS is enabled by setting MCR[5] = 1, causing RTS to deassert when the receive FIFO exceeds its programmed trigger level. Both functions operate independently of CPU intervention. The SC16C750BIB64 implements this entirely in hardware, preventing buffer overflow even under worst-case interrupt latency conditions - critical for medical telemetry and industrial safety systems.
SC16C750BIB64,157 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 64-LQFP
- Series:
- -
- Packaging:
- Tray
- Product Status:
- Obsolete
- Features:
- -
- Number of Channels:
- 1, UART
- FIFO's:
- 64 Byte
- Protocol:
- -
- Data Rate (Max):
- 3Mbps
- Voltage - Supply:
- 2.5V, 3.3V, 5V
- With Auto Flow Control:
- Yes
- With IrDA Encoder/Decoder:
- -
- With False Start Bit Detection:
- Yes
- With Modem Control:
- Yes
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-LQFP (10x10)
SC16C750BIB64,157 FAQ
1.How can I place an order for SC16C750BIB64,157 through Aetrix?
Please submit a Request for Quotation (RFQ) for SC16C750BIB64,157 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 SC16C750BIB64,157 reliable?
The price and inventory of SC16C750BIB64,157 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC16C750BIB64,157 is usually 5 days.
3.What payment methods are accepted for SC16C750BIB64,157?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC16C750BIB64,157 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC16C750BIB64,157?
SC16C750BIB64,157 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC16C750BIB64,157 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 SC16C750BIB64,157?
For technical support, including SC16C750BIB64,157 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC16C750BIB64,157 requirements.
6.How does Aetrix verify that SC16C750BIB64,157 is sourced from the original manufacturer or authorized distributors?
All SC16C750BIB64,157 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 SC16C750BIB64,157 meets industry standards.
7.What is the process for return or replacement of SC16C750BIB64,157?
All SC16C750BIB64,157 units undergo pre-shipment inspection (PSI). If there is an issue with SC16C750BIB64,157, 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 SC16C750BIB64,157 part is unused and in its original packaging.
Return procedure for SC16C750BIB64,157:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SC16C750BIB64,157 Tags
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SC16IS741AIPWJ
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