S-35399A03-J8T2G Seiko Instruments, S-35399A03-J8T2G Datasheet - Page 42

• Manufacturer Part Number: S-35399A03-J8T2G
• Description: Real Time Clock 2-wire Real Time Clock
• Manufacturer: Seiko Instruments

Specifications of S-35399A03-J8T2G

• Supply Voltage (max): 3 V
• Supply Voltage (min): 1.3 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Rtc Bus Interface: Serial
• Supply Current: 0.34 uA
• Package / Case: SOP-8
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

42
2-WIRE REAL-TIME CLOCK
S-35399A03
Crystal oscillator: 32.768 kHz
Caution
Adjustment of Oscillation Frequency
1. Configuration of oscillator
Since crystal oscillation is sensitive to external noise (the clock accuracy is affected), the following measures are
essential for optimizing the oscillation configuration.
(1)
(2)
(3)
(4)
(5)
*1. When using a crystal oscillator with a C
C
C
C
Place the S-35399A03, crystal oscillator, and external capacitor (C
Increase the insulation resistance between pins and the substrate wiring patterns of XIN and XOUT.
Do not place any signal or power lines close to the oscillator.
Locating the GND layer immediately below the oscillator is recommended.
Locate the bypass capacitor adjacent to the power supply pin of the S-35399A03.
L
g
pi
, C
= 6 pF
= 0 to 9.1 pF
1. When using the crystal oscillator with a C
2. Oscillation characteristics is subject to the variation of each component such as substrate parasitic
po
oscillation operation may become unstable. Use a crystal oscillator with a C
capacitance, parasitic resistance, crystal oscillator, and C
sufficient attention for them.
< 5 pF
*1
Locate the GND layer in the layer
Parasitic capacitance C
Parasitic capacitance C
Crystal oscillator
immediately below
C
g
Figure 53 Connection Diagram 1
Figure 54 Connection Diagram 2
pi
L
value of 7 pF, externally connect C
Seiko Instruments Inc.
po
XOUT
XIN
L
exceeding the rated value (7 pF) (e.g : C
C
C
d
g
g
) as close to each other as possible.
R
R
1
2
3
4
g
f
d
. When configuring an oscillator, pay
d
XIN
if necessary.
VSS
XOUT
S-35399A03
Oscillator internal constant
standard values:
L
S-35399A03
value of 6 pF or 7 pF.
8
7
6
5
R
R
C
f
d
d
Rev.2.0
= 100 MΩ
= 100 kΩ
= 8 pF
L
= 12.5 pF),
_00