DS1904 Maxim, DS1904 Datasheet - Page 12

• Manufacturer Part Number: DS1904
• Description: The DS1904 RTC iButton® is a rugged real-time clock module that can be accessed with minimal hardware
• Manufacturer: Maxim

NOTES:
1. All voltages are referenced to ground.
2. V
3. Input load is to ground.
4. Read data setup time refers to the time the host must pull the 1-Wire bus low to read a bit. Data is
5. Under certain low voltage conditions V
6. The reset low time (t
7. The master must read while the data is valid.
8. Guaranteed by design; not production tested.
9. This specification applies if the 1-Wire is idle (high or low). Communication on the 1-Wire may
PACKAGE INFORMATION
For the latest package outline information and land patterns (footprints), 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
guaranteed to be valid within 1 µs of this falling edge.
guarantee a presence pulse.
otherwise, it could mask or conceal interrupt pulses.
adversely affect the accuracy of the device. For highest accuracy, connect the DS1904 to a separate
1-Wire port and limit the access to the minimum acceptable by the application.
PUP
F5 iButton
= external pull-up voltage; see Figure 6.
RSTL
) should be restricted to a maximum of 960 µs, to allow interrupt signaling,
PACKAGE CODE
IB#5CB
IL1MAX
may have to be reduced to as much as 0.5V to always
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OUTLINE NO.
21-0266
LAND PATTERN NO.
—
DS1904