MaxLinear, Inc. ST16C650ACJ44-F

Mfr. Part

ST16C650ACJ44-F

Manufacturer

Exar (MaxLinear)

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Detailed Description

Single-channel UART (16C650-class) with 32-byte transmit/receive FIFOs, up to 3.125 Mbps data rate. Supports Auto Flow Control, IrDA encoder/decoder, false start-bit detection, modem-control signals, and a timer/counter. Works from 2.9 V to 5.5 V for easy 3.3 V or 5 V system design. Parallel host bus interface, compatible with classic 16550/16C650 register sets. Packaged in a 44-PLCC (J-lead) for surface-mount assembly. Protocols supported through external line transceivers: RS-232, RS-422, RS-485. In stock quantity: 2686 units.

Key Features

1 UART channel

32-byte FIFO for TX and RX

Max data rate up to 3.125 Mbps

Supply voltage: 2.9 V to 5.5 V (3.3 V and 5 V logic compatible)

Internal oscillator support for baud-rate generation

Printer port support

Integrated timer/counter

Auto Flow Control (hardware CTS/RTS)

IrDA encoder/decoder on-chip

False start-bit detection for cleaner framing

Full modem-control signals: CTS, RTS, DTR, DSR, DCD, RI

Interrupt-driven operation

16550/16C650 register compatibility for easy drop-in design

Surface-mount 44-PLCC (J-lead), supplier device package 44-PLCC (16.59 x 16.59 mm)

Key Advantages

Smooth high-speed serial transfers with 32-byte FIFOs that reduce CPU overhead

Flexible voltage range simplifies mixed-voltage designs (3.3 V or 5 V systems)

Built-in IrDA support lowers BOM and complexity for infrared serial applications

Hardware flow control and false start-bit detection improve link reliability

Legacy-compatible register set enables quick replacement and easy integration

Robust modem-control and printer-port features for broad peripheral support

Packaging

Type: Plastic Leaded Chip Carrier (PLCC), J-lead

Material: Molded plastic epoxy with copper-alloy lead frame

Size: 44-PLCC, 16.59 x 16.59 mm body

Pins: 44 J-leads around the perimeter (surface-mount)

Pin configuration (high-level): CPU-side parallel bus (D0–D7 data, A0–A2 register select), chip select, read/write, interrupt output, oscillator pins (XIN/XOUT or internal oscillator), UART I/O (TXD, RXD), modem-control signals (CTS, RTS, DTR, DSR, DCD, RI), resets and miscellaneous control

Thermal characteristics: Typical of PLCC packages; final thermal ratings (θJA/θJC, power dissipation) depend on board layout and airflow. Refer to the datasheet for exact values.

Electrical properties: Logic-level interface compatible with CMOS/TTL at 3.3 V or 5 V; protocols RS-232/RS-422/RS-485 supported via external transceiver ICs

Shipment form: Tube for secure handling and assembly

Lifecycle

Current status: Commonly available and not announced for end-of-life based on recent market data. Lifecycle can change; check with us for the latest update.

Equivalents and alternatives (verify pinout, voltage, package, and features before substituting):

- MaxLinear/Exar XR16C650 family (various packages and temp grades)

- NXP SC16C650B series (3.3 V/5 V options, multiple packages)

- Texas Instruments TL16C650C family (comparable 16C650-class UARTs)

- Other 16550/16C650-compatible UARTs from reputable vendors

If an exact drop-in is required or you need a vetted alternative list, contact our sales team via the Y-IC website for detailed guidance.

Key Application Areas

Industrial control and automation (PLC, RS-485 fieldbus, machine interfaces)

Point-of-sale terminals and kiosks

Printers and legacy parallel/serial peripherals

Instrumentation and data loggers

Telecom and networking equipment

Embedded systems and single-board computers

Modems and serial consoles

IrDA-based wireless serial links

Datasheet

Y-IC hosts the most authoritative datasheet for this product model. Download it directly from this page for full specifications, pinouts, and design guidance.

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