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參數(shù)資料
| 型號： | M41T81MY |
| 廠商： | 意法半導體 |
| 英文描述： | SERIAL ACCESS RTC WITH ALARMS |
| 中文描述： | 串行訪問時鐘用鬧鐘 |
| 文件頁數(shù)： | 8/28頁 |
| 文件大小： | 386K |
| 代理商： | M41T81MY |
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M41T81
8/28
Table 5. DC Characteristics
Note: 1. Valid for Ambient Operating Temperature: T
A
= –40 to 85°C; V
CC
= 2.0 to 5.5V (except where noted).
2. STMicroelectronics recommends the RAYOVAC BR1225 or BR1632 (or equivalent) as the battery supply.
3. After switchover (V
SO
), V
BAT
(min) can be 2.0V for crystal with R
S
= 40K
.
4. For rechargeable back-up, V
BAT
(max) may be considered V
CC
.
5. For IRQ/FT/OUT/SQW pin (Open Drain)
Table 6. Crystal Electrical Characteristics
Note: 1. Externally supplied if using the SO8 package. STMicroelectronics recommends the KDS DT-38: 1TA/1TC252E127, Tuning Fork
Type (thru-hole) or the DMX-26S: 1TJS125FH2A212, (SMD) quartz crystal for industrial temperature operations. KDS can be con-
tacted at kouhou@kdsj.co.jp or http://www.kdsj.co.jp for further information on this crystal type.
2. Load capacitors are integrated within the M41T81. Circuit board layout considerations for the 32.768 kHz crystal of minimum trace
lengths and isolation from RF generating signals should be taken into account.
Sym
Parameter
Test Condition
(1)
Min
Typ
Max
Unit
I
LI
Input Leakage Current
0V
≤
V
IN
≤
V
CC
±1
μ
A
I
LO
Output Leakage Current
0V
≤
V
OUT
≤
V
CC
±1
μ
A
I
CC1
Supply Current
Switch Freq = 400kHz
400
μ
A
I
CC2
Supply Current (standby)
SCL,SDA = V
CC
– 0.3V
100
μ
A
V
IL
Input Low Voltage
–0.3
0.3V
CC
V
V
IH
Input High Voltage
0.7V
CC
V
CC
+ 0.3
V
V
OL
Output Low Voltage
I
OL
= 3.0mA
0.4
V
Output Low Voltage (Open Drain)
(5)
I
OL
= 10mA
0.4
V
V
BAT(2)
Battery Supply Voltage
2.5
(3)
3
3.5
(4)
V
I
BAT
Battery Supply Current
T
A
= 25°C, V
CC
= 0V
Oscillator ON, V
BAT
= 3V
0.6
1
μA
Sym
Parameter
(1,2,3)
Min
Typ
Max
Units
f
O
Resonant Frequency
32.768
kHz
R
S
Series Resistance
60
k
C
L
Load Capacitance
12.5
pF
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