DS1990R-F3 Maxim, DS1990R-F3 Datasheet - Page 9

• Manufacturer Part Number: DS1990R-F3
• Description: The DS1990R Serial Number iButton® is a rugged data carrier that serves as an electronic registration number for automatic identification
• Manufacturer: Maxim

A read-data time slot begins like a write-one time slot.
The voltage on the data line must remain below V
until the read low time t
window, when responding with a 0, the DS1990R starts
pulling the 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 does not hold the data line low at all, and the
voltage starts rising as soon as t
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in
the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to
the package regardless of RoHS status.
PACKAGE TYPE
F3 iButton
F5 iButton
_______________________________________________________________________________________
RL
is expired. During the t
RL
is over.
PACKAGE CODE
Slave-to-Master
IB#3NB
IB#5NB
ILMAX
RL
The sum of t
nal timing generator of the DS1990R on the other side
define the master sampling window (t
t
the data line. For most reliable communication, t
should be as short as permissible and the master should
read close to but no later than t
from the data line, the master must wait until t
expired. This guarantees sufficient recovery time t
for the DS1990R to get ready for the next time slot.
MSRMAX
Serial Number iButton
OUTLINE NO.
21-0252
21-0266
) in which the master must perform a read from
RL
+ δ (rise time) on one side and the inter-
Package Information
LAND PATTERN NO.
MSRMAX
—
—
. After reading
MSRMIN
SLOT
REC
RL
to
9
is