DS1990R-F5 Maxim Integrated Products, DS1990R-F5 Datasheet - Page 8

• Manufacturer Part Number: DS1990R-F5
• Description: Serial Number Registration
• Manufacturer: Maxim Integrated Products

Specifications of DS1990R-F5

• Lead Free Status / Rohs Status: No

SLAVE-TO-MASTER
A read-data time slot begins like a write-one time slot. The voltage on the data line must remain below V
the read low time t
data line low; its internal timing generator determines when this pulldown ends and the voltage starts rising again.
When responding with a 1, the DS1990R will not hold the data line low at all, and the voltage starts rising as soon
as t
The sum of t
define the master sampling window (t
For most reliable communication, t
later than t
sufficient recovery time t
Figure 7. READ/WRITE TIMING DIAGRAM
Write-One Time Slot
Write-Zero Time Slot
Read-Data Time Slot
RL
is over.
V
V
V
MSRMAX
IHMASTER
IHMASTER
IHMASTER
RL
V
V
V
V
V
V
V
V
V
ILMAX
ILMAX
ILMAX
IHMIN
IHMIN
IHMIN
+ d (rise rime) on one side and the internal timing generator of the DS1990R on the other side
PUP
PUP
PUP
0V
0V
0V
. After reading from the data line, the master must wait until t
RL
is expired. During the t
t
F
t
t
F
F
REC
RESISTOR
RESISTOR
RESISTOR
for the DS1990R to get ready for the next time slot.
t
RL
t
W1L
RL
should be as short as permissible and the master should read close to but no
e
MSRMIN
d
t
W0L
RL
to t
Sampling
window, when responding with a 0, the DS1990R will start pulling the
Window
Master
MSRMAX
t
MSR
) in which the master must perform a read from the data line.
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MASTER
MASTER
MASTER
t
SLOT
t
SLOT
t
SLOT
SLOT
t
REC
DS1990R
t
REC
is expired. This guarantees
ILMAX
until