My Inquiry
My Account
NXP Semiconductors SC28L194A1BE,557
- Part No.:
- SC28L194A1BE,557
- Manufacturer:
- NXP Semiconductors
- Package:
- 80-LQFP
- Datasheet:
-
SC28L194A1BE,557.pdf
- Description:
- IC UART QUAD W/FIFO 80-LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,094
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SC28L194A1BE,557 from NXP Semiconductors (formerly Philips) is a quad-channel CMOS UART IC supporting simultaneous 3.3 V and 5 V operation, featuring four independent full-duplex asynchronous serial channels, 16-byte transmit/receive FIFOs per channel, programmable baud rates up to 500 kbaud, and hardware/software flow control (RTS/CTS + XON/XOFF). It serves as a high-density serial interface controller in industrial terminal servers and data concentrators.
For engineers reviewing the SC28L194A1BE,557 datasheet, SC28L194A1BE,557 pinout, SC28L194A1BE,557 application, or SC28L194A1BE,557 equivalent, this device delivers deterministic interrupt arbitration with vectored vectors, multi-drop address recognition, and synchronous host bus timing - critical for legacy embedded systems requiring reliable multi-channel RS-232/RS-485 bridging with minimal CPU overhead.
Technical Context
The SC28L194A1BE,557 integrates four independent UART channel blocks, each with dedicated 16-byte TX/RX FIFOs, programmable data format (5–8 bits, parity, 1/1.5/2 stop bits), and receiver watchdog (64 clock cycles). Its timing subsystem includes an on-chip crystal oscillator (2–8 MHz), fixed-rate baud generator (22 standard rates), and two 16-bit programmable counters for non-standard baud synthesis.
Interrupt handling uses priority-based arbitration across 64 sources - including FIFO fill/empty thresholds, change-of-state detection on I/O pins, XON/XOFF recognition, and address-match events - with automatic vector modification by channel and interrupt type. The synchronous host interface operates at up to 33 MHz with 125 ns bus cycle time and 15 ns data bus release.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 4 independent full-duplex UARTs - enables consolidation of four serial ports onto single IC, reducing board space and host bus load. |
| FIFO depth | 16 bytes TX + 16 bytes RX per channel - minimizes interrupt frequency and prevents overrun under burst traffic (e.g., modem handshaking). |
| Baud rate range | 50 bps to 500 kbps - supports legacy low-speed telemetry and modern high-throughput serial links via internal BRG or external clocks. |
| Supply voltage | 3.3 V ±10% or 5.0 V ±10% - dual-voltage compatibility allows drop-in replacement in mixed-voltage legacy systems without level-shifting. |
| Host interface | Synchronous 8-bit parallel bus, 33 MHz max SCLK - ensures deterministic register access timing and eliminates wait-state uncertainty in real-time firmware. |
| Operating temperature | −40 °C to +85 °C - qualified for industrial environments including factory automation and outdoor data concentrators. |
| Package | 80-pin LQFP (SOT315-1) - surface-mount footprint with thermal performance suitable for convection-cooled industrial PCBs. |
Pinout & Package
SC28L194A1BE,557 is housed in an 80-pin Low Profile Quad Flat Pack (LQFP), SOT315-1 package, with dedicated power domains (Vcc_i/Vss_i for logic, Vcc_o/Vss_o for drivers) and noise-isolated clock inputs (SClk, X1/CCLK, X2).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CEN | Chip Enable (active-low) | Enables host register access; must be deasserted during IACKN cycle to avoid bus contention. |
| W_RN | Write/Read Not control | High = write to register/FIFO; low = read status/data - defines direction on shared D[7:0] bus. |
| D[7:0] | Bi-directional data bus | Carries command/status and serial data between host CPU and UART; requires external pull-ups for open-drain handshake signals. |
| IRQN / IACKN | Interrupt request / acknowledge | Active-low open-drain outputs/inputs - support vectored interrupt servicing with channel- and type-encoded priority resolution. |
| RxDa–d / TxDa–d | Serial receive/transmit lines | Four independent full-duplex channels - each pair connects directly to line drivers (e.g., MAX232, SP3232) for RS-232 or transceivers for RS-485. |
| I/O0a–d to I/O3a–d | Per-channel I/O pins | Configurable as modem control (RTS/CTS/DSR/DTR), clocks, or GPIO - each with change-of-state detection for edge-triggered event capture. |
| Gin0/Gin1 | Global input pins | Shared across all channels - used for synchronized external triggers (e.g., frame sync, reset propagation). |
| Gout0/Gout1 | Global output pins | Driven by any channel - enable coordinated signaling (e.g., LED status, system alert) without host intervention. |
Key Features
| Feature | Design Value |
|---|---|
| Vectored interrupts with channel/type encoding | Reduces ISR polling overhead: single CIR read returns channel number, interrupt source (RX/TX/COS), and FIFO fill level - enabling direct jump to optimized handler. |
| Programmable 16-byte FIFO thresholds | Allows fine-grained interrupt triggering (e.g., generate IRQ at 12/16 RX full) - balances latency vs. CPU load in real-time protocols like Modbus RTU. |
| In-band XON/XOFF + hardware RTS/CTS flow control | Prevents buffer overflow without host involvement - essential for unattended remote terminals and statistical multiplexers handling bursty sensor data. |
| Multi-drop address recognition (9-bit mode) | Enables single bus to serve multiple slave devices using address byte detection - reduces wiring complexity in building/plant control networks. |
| On-chip crystal oscillator (2–8 MHz) | Eliminates external crystal + load capacitors - simplifies BOM and layout while maintaining ±50 ppm stability over industrial temp range. |
| Power-down mode with register retention | Stops oscillator but preserves configuration and FIFO contents - cuts quiescent current to µA range during idle periods in battery-backed concentrators. |
Applications
| Statistical Multiplexer | Data Concentrator |
|---|---|
Use Scenario: Aggregating asynchronous traffic from dozens of low-speed field devices (e.g., meters, sensors) onto a single T1/E1 or Ethernet uplink. IC Role / Device Role / Timing Role: SC28L194A1BE,557 acts as the central serial interface hub, managing four concurrent RS-232/485 links with autonomous flow control and interrupt-driven packet framing. Use Value: 16-byte FIFOs absorb burst traffic; programmable baud rates adapt to heterogeneous device speeds; vectored interrupts minimize host CPU load during high-concurrency polling. |
Use Scenario: Collecting time-stamped process data from PLCs, RTUs, and environmental monitors in oil/gas or water treatment plants. IC Role / Device Role / Timing Role: SC28L194A1BE,557 provides isolated, noise-immune serial channels with change-of-state detection on I/O pins for alarm/event capture. Use Value: Dual supply (3.3 V/5 V) interfaces legacy 5 V sensors and modern 3.3 V controllers; global inputs synchronize timestamping across channels. |
| Terminal Server | ISDN Front End |
Use Scenario: Enabling legacy serial terminals (VT100, Wyse) to connect to modern IP networks via TCP-to-serial gateways. IC Role / Device Role / Timing Role: SC28L194A1BE,557 handles four concurrent terminal sessions with hardware handshaking and break detection for session management. Use Value: Receiver watchdog detects stuck lines; false start bit rejection improves reliability on noisy long-haul cables; power-down mode reduces heat in fanless enclosures. |
Use Scenario: Bridging ISDN S/T bus signaling to asynchronous serial interfaces for protocol converters and PBX add-ons. IC Role / Device Role / Timing Role: SC28L194A1BE,557 manages serial control channels for D-channel signaling and B-channel data framing in ISDN terminal adapters. Use Value: Programmable data formats (7E1, 8N1) match ISDN layer 2 requirements; multi-drop mode supports daisy-chained terminal configurations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad UART applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| EXAR XR16L788IQ-F | 8-channel, 64-byte FIFOs, PCIe/PCI host interface, 3.3 V only | Higher channel count and deeper FIFOs suit high-throughput server-class terminal servers; lacks 5 V compatibility and synchronous parallel bus. | Select when scaling beyond 4 ports or migrating to modern PC platforms; not pin-compatible with SC28L194A1BE,557. |
| MaxLinear XR16M554IL48-F | 4-channel, 128-byte FIFOs, integrated USB 2.0 bridge, 3.3 V only | USB-native interface eliminates need for separate USB controller; targets embedded designs adding serial ports to USB hosts (e.g., Raspberry Pi add-ons). | Choose for USB-hosted applications; incompatible with parallel bus architecture and dual-voltage operation of SC28L194A1BE,557. |
Compared with EXAR XR16L788IQ-F and MaxLinear XR16M554IL48-F, the SC28L194A1BE,557 uniquely supports both 3.3 V and 5 V supplies, synchronous parallel host interfacing, and industrial temperature range - making it irreplaceable in legacy industrial control systems where voltage flexibility and deterministic bus timing are mandatory.
Availability
SC28L194A1BE,557 is available at Aetrix Electronics and suitable for industrial terminal servers, data concentrators, and ISDN front-end equipment requiring stable component supply across extended product lifecycles.
Supply support for SC28L194A1BE,557 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, formerly Philips Semiconductors, is a global leader in high-reliability interface and connectivity ICs, with deep heritage in industrial communications and automotive-grade silicon.
The SC28L194A1BE,557 belongs to NXP's legacy communications controller family, designed specifically for robust, multi-channel serial bridging in harsh industrial environments where long-term availability and deterministic timing are critical.
FAQ
What voltage levels does the SC28L194A1BE,557 support?
The SC28L194A1BE,557 operates from either a single 3.3 V ±10% or 5.0 V ±10% supply - no level shifters required. Its I/O pins are TTL-compatible at both voltages, and internal power domains (Vcc_i/Vss_i for logic, Vcc_o/Vss_o for drivers) ensure noise isolation. This dual-supply capability enables direct integration into mixed-voltage legacy systems.
Does the SC28L194A1BE,557 support hardware flow control?
Yes, the SC28L194A1BE,557 supports full hardware flow control via RTS/CTS (RTSN/CTSN) signals on each of its four UART channels. Each channel has dedicated I/O pins configurable as modem controls, with built-in change-of-state detection to trigger interrupts on signal transitions - essential for reliable handshaking in industrial serial links.
How does the interrupt system work in the SC28L194A1BE,557?
The SC28L194A1BE,557 uses a priority-based arbitration system across 64 interrupt sources - including FIFO thresholds, error conditions, and I/O changes. Upon assertion, IRQN signals pending service; during IACKN, the Current Interrupt Register (CIR) captures channel, source type, and FIFO level - enabling vectored, zero-polling interrupt handling in real-time firmware.
Can the SC28L194A1BE,557 generate non-standard baud rates?
Yes, the SC28L194A1BE,557 supports non-standard baud rates via two programmable 16-bit BRG timers. These accept eight clock sources (including X1, counters, or external inputs) and generate symmetrical 16× clocks - allowing precise synthesis up to 500 kbaud. The formula n = (BRG Timer Input Frequency) / (2 × 16 × desired baud rate) – 1 determines reload values.
What is the purpose of the Gin0/Gin1 and Gout0/Gout1 pins on the SC28L194A1BE,557?
Gin0 and Gin1 are global input pins accessible by all four UART channels - used for synchronized external events (e.g., master reset pulse, frame sync). Gout0 and Gout1 are global outputs driven by any channel - enabling coordinated signaling (e.g., activity LED, system alert) without host CPU involvement. Both support change-of-state detection and interrupt generation.
SC28L194A1BE,557 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 80-LQFP
- Series:
- -
- Packaging:
- Tray
- Product Status:
- Obsolete
- Features:
- Internal Oscillator, Timer/Counter
- Number of Channels:
- 4, QUART
- FIFO's:
- 16 Byte
- Protocol:
- -
- Data Rate (Max):
- -
- Voltage - Supply:
- 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:
- 80-LQFP (12x12)
SC28L194A1BE,557 FAQ
1.How can I place an order for SC28L194A1BE,557 through Aetrix?
Please submit a Request for Quotation (RFQ) for SC28L194A1BE,557 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 SC28L194A1BE,557 reliable?
The price and inventory of SC28L194A1BE,557 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC28L194A1BE,557 is usually 5 days.
3.What payment methods are accepted for SC28L194A1BE,557?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC28L194A1BE,557 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC28L194A1BE,557?
SC28L194A1BE,557 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC28L194A1BE,557 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 SC28L194A1BE,557?
For technical support, including SC28L194A1BE,557 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC28L194A1BE,557 requirements.
6.How does Aetrix verify that SC28L194A1BE,557 is sourced from the original manufacturer or authorized distributors?
All SC28L194A1BE,557 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 SC28L194A1BE,557 meets industry standards.
7.What is the process for return or replacement of SC28L194A1BE,557?
All SC28L194A1BE,557 units undergo pre-shipment inspection (PSI). If there is an issue with SC28L194A1BE,557, 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 SC28L194A1BE,557 part is unused and in its original packaging.
Return procedure for SC28L194A1BE,557:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SC28L194A1BE,557 Tags
-
SC16IS741AIPWJ
NXP Semiconductors
-
TL16C550CPTR
Texas Instruments
-
TL16C550CIPTR
Texas Instruments
-
SC16C752BIB48,128
NXP Semiconductors
-
ST16C2550CQ48-F
MaxLinear, Inc.
-
ST16C2550CJ44-F
MaxLinear, Inc.
-
ST16C2552CJ44-F
MaxLinear, Inc.
-
ST16C1550IQ48-F
MaxLinear, Inc.
-
ST16C2550IQ48-F
MaxLinear, Inc.
-
ST16C554DIQ64-F
MaxLinear, Inc.
-
ST16C554DCQ64-F
MaxLinear, Inc.
-
XR17V352IB113-F
MaxLinear, Inc.
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
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…
