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M41T62 数据表(PDF) 26 Page - STMicroelectronics

部件名 M41T62
功能描述  Low-power serial real-time clocks (RTCs) with alarm
PDF  42 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

M41T62 数据表(HTML) 26 Page - STMicroelectronics

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Sym
Parameter
Conditions
Min.
Typ.
Max.
Unit
Cd
XOUT capacitance
12
pF
IC-to-IC frequency variation (1) (2)
–10
+10
ppm
1. Devices in LCC8 package ((M41T62LC6F) are tested not to exceed ±20 ppm oscillator frequency error at
25 °C, which equates to about 52 seconds per month.
2. Reference value. TA = 25 °C, VCC = 3.0 V, CMJ-145 (CL = 6 pF, 32.768 Hz) manufactured by Citizen, CL =
Cg · Cd / (Cg + Cd).
Figure 24. Bus timing requirements sequence
SDA
P
tSU:STO
tSU:STA
tHD:STA
SR
SCL
tSU:DAT
tF
tHD:DAT
tR
tHIGH
tLOW
tHD:STA
tBUF
S
P
Table 17. AC characteristics
Sym
Parameter (1)
Min.
Max.
Units
fSCL
SCL clock frequency
0
400
kHz
tLOW
Clock low period
1.3
µs
tHIGH
Clock high period
600
ns
tR
SDA and SCL rise time
300
ns
tF
SDA and SCL fall time
300
ns
tHD:STA
START condition hold time
(after this period the first clock pulse is generated)
600
ns
tSU:STA
START condition setup time
(only relevant for a repeated start condition)
600
ns
tSU:DAT (2)
Data set-up time
100
ns
tHD:DAT
Data hold time
0
µs
tSU:STO
STOP condition setup time
600
ns
tBUF
Time the bus must be free before a new
transmission can start
1.3
µs
trec
Watchdog output pulse width
96
98
ms
1. Valid for ambient operating temperature: TA = –40 to 85 °C; VCC = 1.3 to 4.4 V (except where noted).
2. Transmitter must internally provide a hold time to bridge the undefined region (300 ns max.) of the falling edge of SCL.
M41T62, M41T64, M41T65
DC and AC parameters
DS3840 - Rev 24
page 26/42



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