M41T315V View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'M41T315V' PDF : 30 Pages View PDF
M41T315Y, M41T315V, M41T315W
DC and AC parameters
Table 10. Crystal electrical characteristics (externally supplied)
Symbol
Parameter(1)(2)
Min
Typ
Max
Unit
fO
Resonant frequency
32.768
kHz
RS
Series resistance
60
kΩ
CL
Load capacitance
12.5
pF
1. These values are externally supplied. STMicroelectronics recommends the KDS DT-38:
1TA/1TC252E127, Tuning Fork Type (thruhole) or the DMX-26S: 1TJS125FH2A212, (SMD) quartz crystal
for industrial temperature operations. KDS can be contacted 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 M41T315Y/V/W. Circuit board layout considerations for the
32.768kHz crystal of minimum trace lengths and isolation from RF generating signals should be taken into
account.
Figure 11. Power down/up mode AC waveforms
VCC
VPFD (max)
VPFD (min)
VSO
CEI
tPD
CEO
tFB
tF
tPF
DON’T CARE
VBAT 0.2V
VBAT 0.2V
tR
tREC
tPD
AI04257
Table 11. Power down/up trip points DC characteristics
Symbol
Parameter(1)(2)
Min
Max
Unit
tREC VPFD (max) to CEI low
1.5
2.5
ms
tF
VPFD (max) to VPFD (min) VCC fall time
300
µs
tFB
VPFD (min) to VSO VCC fall time
10
µs
tR
VPFD (min) to VPFD (max) VCC rise time
0
µs
tPF
CEI high to power-fail
0
µs
tPD(3)(4) CEI propagation delay
M41T315Y
M41T315V/W
10
ns
15
ns
1. Valid for ambient operating temperature: TA = –40 to 85°C; VCC = 4.5 to 5.5V or 2.7 to 3.6V (except
where noted).
2. Measured at 25°C.
3. Measured with load shown in Figure 10 on page 19.
4. Input pulse rise and fall times equal 10ns
21/30
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