參數(shù)資料
型號(hào)： M41T81SMY6E
廠商： 意法半導(dǎo)體
英文描述： Serial Access Real-Time Clock with Alarms
中文描述： 串行訪問(wèn)實(shí)時(shí)時(shí)鐘與鬧鐘
文件頁(yè)數(shù)： 21/29頁(yè)
文件大?。?/td> 438K
代理商： M41T81SMY6E
21/29
M41T81S
Table 9. DC Characteristics
Note: 1. Valid for Ambient Operating Temperature: T
A
= –40 to 85°C; V
CC
= 2.7 to 5.5V (except where noted).
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
BAT
(max) may be considered to be V
CC
.
Table 10. 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 M41T81S. Circuit board layout considerations for the 32.768kHz crystal of minimum trace
lengths and isolation from RF generating signals should be taken into account.
3. For applications requiring back-up supply operation below 2.5V, R
S
(max) should be considered 40k
.
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 = 0Hz
All Inputs
≥
V
CC
– 0.2V
≤
V
SS
+ 0.2V
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)
(2)
I
OL
= 10mA
0.4
V
Pull-up Supply Voltage (Open Drain)
IRQ/OUT/FT/SQW
5.5
V
V
BAT(3)
Back-up Supply Voltage
2.0
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)
Min
Typ
Max
Units
f
O
Resonant Frequency
32.768
kHz
R
S
Series Resistance
60
(3)
k
C
L
Load Capacitance
12.5
pF
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