DS2740

13 of 15

READ-TIME SLOTS

A read-time slot is initiated when the bus master pulls the 1-Wire bus line from a logic-high level to a

time slot. By the end of the read-time slot, the DS2740 releases the bus line and allows it to be pulled

Figure 12. 1-WIRE WRITE- AND READ-TIME SLOTS

LINE TYPE LEGEND:

Bus master active low

DS2740 active low

Resistor pullup

Both bus master and

DS2740 active low

GND

READ 0 SLOT

READ 1 SLOT

>1

ms

Master Sample Window

Master Sample Window

GND

Standard

WRITE 0 SLOT

WRITE 1 SLOT

>1

ms

DS2740 Sample Window

MIN

TYP

MAX

15

ms

15

ms

30

ms

DS2740 Sample Window

MIN

TYP

MAX

15

ms

15

ms

30

ms

2

ms

Overdrive

Mode

1

ms

3

ms

1

ms

2

ms

3

ms