Datasheet

Dual Serial UART with 128-Word FIFOs
MAX3109
2 Maxim Integrated
Absolute Maximum Ratings ...................................................................... 7
Package Thermal Characteristics
.................................................................. 7
DC Electrical Characteristics
..................................................................... 7
AC Electrical Characteristics
.................................................................... 10
Timing Diagrams
............................................................................. 12
Typical Operating Characteristics
................................................................ 13
Pin Configuration
............................................................................. 14
Pin Description
............................................................................... 14
Detailed Description
........................................................................... 16
Receive and Transmit FIFOs
...................................................................16
Transmitter Operation
........................................................................17
Receiver Operation
..........................................................................17
Line Noise Indication
.........................................................................18
Clock Selection
.............................................................................19
Crystal Oscillator
.........................................................................19
External Clock Source
.....................................................................19
PLL and Predivider
..........................................................................19
Fractional Baud-Rate Generators
...............................................................19
2x and 4x Rate Modes
.......................................................................20
Low-Frequency Timer
........................................................................20
UART Clock to GPIO
.........................................................................21
Multidrop Mode
.............................................................................21
Auto Data Filtering in Multidrop Mode
...........................................................21
Auto Transceiver Direction Control
..............................................................21
Transmitter Triggering and Synchronization
.......................................................21
Transmitter Synchronization
.................................................................22
Intrachip and Interchip Synchronization
........................................................22
Delayed Triggering
........................................................................22
Trigger Accuracy
.........................................................................22
Synchronization Accuracy
..................................................................23
Auto Transmitter Disable
...................................................................24
Echo Suppression
...........................................................................24
Auto Hardware Flow Control
...................................................................24
AutoRTS Control
..........................................................................24
AutoCTS Control
..........................................................................25
Auto Software (XON/XOFF) Flow Control
.........................................................25
Receiver Flow Control
.....................................................................25
Transmitter Flow Control
....................................................................26
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