10 rtc crystal oscillator, 11 die temperature sensor – Rainbow Electronics AT73C246 User Manual
Page 21
21
11050A–PMAAC–07-Apr-10
AT73C246
9.10 RTC Crystal Oscillator
Note:
1. Current consumption in V
BACKUP
with crystal. In case of crystal not present on-board, back-up batteries or supercapacitors,
must be avoided.
9.11 Die Temperature Sensor
Table 9-11.
RTC Crystal Oscillator Electrical Characteristics
Symbol
Parameter
Comments
Min
Typ
Max
Units
V
IN
Operating Supply Voltage
V
BACKUP
1.75
2.5
2.65
V
Freq
Frequency
with crystal
-
32.768
-
kHz
Duty
Duty Cycle
40
50
60
%
I
DD
Supply Current
OFF
-
-
5
nA
ON
-
-
1.5
µA
T
ON
Startup Time
C
L
= 12pF
-
1000
1500
ms
V
XIN
Level Sinus Wave on XIN
250
300
mVpp
V
XOUT
Vpp On XOUT
300
mVpp
R
F
Internal Resistor
between xin and xout
10
M
Ω
Drift
Accuracy
@25°C, +/- 20ppm
1.5
mn/month
Esr
Equivalent Series Resistance Rs
Crystal @ 32.768kHz
50
100
k
Ω
C
M
Motional Capacitance
Crystal @ 32.768kHz
0.6
3
fF
C
SHUNT
Shunt Capacitance
Crystal @ 32.768kHz
0.6
2
pF
C
LOAD
Load Capacitance
Crystal @ 32.768kHz
6
12.5
pF
Table 9-12.
Die Temperature Sensor Electrical Characteristics
Symbol
Parameter
Comments
Min
Typ
Max
Units
T
SHUTDOWN
130°C Shutdown Threshold
135
145
155
°C
T
RESTART
110°C Restart Threshold
105
115
125
°C