M41T315Y Datasheet, PDF (17/24 Pages) STMicroelectronics – Serial Access Phantom RTC Supervisor

M41T315Y*, M41T315V, M41T315W
Table 10. Crystal Electrical Characteristics (Externally Supplied)
Symbol
Parameter^(1,2)
Min
Typ
Max
Unit
f_O
Resonant Frequency
32.768
kHz
R_S
Series Resistance
60
kΩ
C_L
Load Capacitance
12.5
pF
Note: 1. These values are externally supplied. 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 contacted at kou-
[e-mail] or http://www.kdsj.co.jp for further information on this crystal type.
Note: 1. 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 13. 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
t_REC
V_PFD (max) to CEI low
1.5
2.5
ms
t_F
V_PFD (max) to V_PFD (min) V_CC Fall Time
300
µs
t_FB
V_PFD (min) to V_SO V_CC Fall Time
10
µs
t_R
V_PFD (min) to V_PFD (max) V_CC Rise Time
0
µs
t_PF
CEI High to Power-Fail
0
µs
t_PD(3,4) ^{CEI Propagation Delay}
M41T315Y
M41T315V/W
10
ns
15
ns
Note: 1. Valid for Ambient Operating Temperature: T_A = –40 to 85°C; V_CC = 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 12., page 15.
4. Input pulse rise and fall times equal 10ns
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