Datasheet

2 Maxim Integrated
Quad Serial UART with 128-Word FIFOs
MAX14830
General Description ............................................................................ 1
Applications
.................................................................................. 1
Features
..................................................................................... 1
Ordering Information
........................................................................... 1
Functional Diagram
............................................................................ 7
Absolute Maximum Ratings
...................................................................... 8
Package Thermal Characteristics
.................................................................. 8
DC Electrical Characteristics
..................................................................... 8
AC Electrical Characteristics
.................................................................... 10
Test Circuits/Timing Diagrams
................................................................... 13
Typical Operating Characteristics
................................................................ 14
Pin Configuration
............................................................................. 15
Pin Description
............................................................................... 15
Detailed Description
........................................................................... 18
Receive and Transmit FIFOs
...................................................................18
Transmitter Operation
........................................................................18
Receiver Operation
..........................................................................19
Line Noise Indication
.........................................................................20
Clocking and Baud-Rate Generation
............................................................20
Crystal Oscillator
.........................................................................20
External Clock Source
.....................................................................20
PLL and Predivider
..........................................................................20
Fractional Baud-Rate Generators
...............................................................21
2x and 4x Rate Modes
.......................................................................21
Low-Frequency Timer
........................................................................22
UART Clock to GPIO
.........................................................................22
Multidrop Mode
.............................................................................22
Auto Data Filtering in Multidrop Mode
.........................................................22
Auto Transceiver Direction Control
..............................................................22
Transmitter Triggering and Synchronization
.......................................................23
Transmitter Synchronization
.................................................................23
Intrachip and Interchip Synchronization
........................................................23
Delayed Triggering
........................................................................23
Trigger Accuracy
.........................................................................24
Synchronization Accuracy
..................................................................24
Auto Transmitter Disable
......................................................................24
Echo Suppression
...........................................................................24
Auto Hardware Flow Control
...................................................................26
TABLE OF CONTENTS