The timing of the DS18B20 is a lot more complex than a UART. With UART you specify a bitrate of for instance 9600 bits per second and you know each bit will be 104 us. That's the only number you need.
On pages 15 ff. of the datasheet the timing of the DS18B20 is explained. For instance
During the initialization sequence the bus master transmits (TX) the reset pulse by pulling the 1-Wire bus low for a minimum of 480μs. The bus master then releases the bus and goes into receive mode (RX). When the bus is released, the 5kΩ pullup resistor pulls the 1-Wire bus high. When the DS18B20 detects this rising edge, it waits 15μs to 60μs and then transmits a presence pulse by pulling the 1-Wire bus low for 60μs to 240μs.
You get similar prose for read and write times.