m41t81s STMicroelectronics, m41t81s Datasheet - Page 24

• Manufacturer Part Number: m41t81s
• Description: Serial Access Real-time Clock With Alarms
• Manufacturer: STMicroelectronics

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Table 9.
1. Valid for Ambient Operating Temperature: T
2. For IRQ/FT/OUT/SQW pin (open drain)
3. STMicroelectronics recommends the RAYOVAC BR1225 or BR1632 (or equivalent) as the battery supply.
4. For rechargeable back-up, V
Table 10.
1. Externally supplied if using the SO8 package. STMicroelectronics recommends the KDS DT-38:
2. Load capacitors are integrated within the M41T81S. Circuit board layout considerations for the 32.768kHz
3. For applications requiring back-up supply operation below 2.5V, R
Figure 16. Power down/up mode AC waveforms
V
Sym
I
I
V
BAT
I
V
I
V
1TA/1TC252E127, Tuning Fork Type (thru-hole) or the DMX-26S: 1TJS125FH2A212, (SMD) quartz
crystal for industrial temperature operations. KDS can be contacted at [e-mail] or
http://www.kdsj.co.jp for further information on this crystal type.
crystal of minimum trace lengths and isolation from RF generating signals should be taken into account.
CC1
CC2
BAT
I
Sym
LO
LI
OL
IH
IL
R
C
f
O
(3)
S
L
Input Leakage Current
Output Leakage Current
Supply Current
Supply Current (standby)
Input Low Voltage
Input High Voltage
Output Low Voltage
Output Low Voltage (Open
Drain)
Pull-up Supply Voltage (Open
Drain)
Back-up Supply Voltage
Battery Supply Current
Resonant Frequency
Series Resistance
Load Capacitance
DC characteristics
Crystal electrical characteristics
V CC
V SO
SDA
SCL
(2)
Parameter
tPD
Parameter
BAT
(max) may be considered to be V
(1)and(2)
A
Switch Freq = 400kHz
Oscillator ON, V
T
= –40 to 85°C; V
IRQ/OUT/FT/SQW
0V ≤ V
A
Test Condition
0V ≤ V
= 25°C, V
≥ V
DON'T CARE
≤ V
I
I
SCL = 0Hz
OL
OL
All Inputs
CC
SS
= 3.0mA
= 10mA
OUT
3V
IN
+ 0.2V
– 0.2V
≤ V
CC
≤ V
CC
BAT
CC
= 0V
CC
(1)
= 2.7 to 5.5V (except where noted).
S
CC
=
(max) should be considered 40kΩ.
.
Min
0.7V
–0.3
Min
2.0
CC
32.768
12.5
Typ
trec
Typ
0.6
AI00596
60
Max
0.3V
V
3.5
Max
(3)
400
100
0.3
0.4
0.4
5.5
CC
±1
±1
1
(4)
CC
+
Units
kHz
kΩ
pF
Unit
μA
μA
μA
μA
µA
V
V
V
V
V
V