Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent
licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and
max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
26
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DS1390–DS1394
Low-Voltage SPI/3-Wire RTCs with
Trickle Charger
Revision History
REVISION
NUMBER
REVISION
DATE
DESCRIPTION
PAGES
CHANGED
0 7/04 Initial release. —
Added text to the General Description section to indicate that the bus interface is disabled
when the part switches to V
BACKUP
; replaced Ordering Information table with lead-free
packages.
1
Added 0MHz (min) spec for SCLK frequency for SPI, 3-wire AC timing. 3, 5
Added the “High Impedance” label for DOUT to Figure 1 and added DOUT trace to Figure
2.
4
Changed all references of V
BAT
to V
BACKUP
. 8, 10
1 1/07
Replaced the Operation section with the Power Control section and added new Table 1. 11, 12
Added the DS1394. All
2 8/08
In the Address Map section, added the description on how to avoid misreads of the time
registers.
15
3 8/09 Added DS1390U-33/V+ to the Ordering Information table. 1
4 10/12 Updated Ordering Information 1
