M41T315Y, M41T315V, M41T315W DC and AC parameters
21/30
Figure 11. Power down/up mode AC waveforms
Table 10. Crystal electrical characteristics (externally supplied)
Symbol Parameter
(1)(2)
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.
Min Typ Max Unit
f
O
Resonant frequency 32.768 kHz
R
S
Series resistance 60 kΩ
C
L
Load capacitance 12.5 pF
Table 11. Power down/up trip points DC characteristics
Symbol Parameter
(1)(2)
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.
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)
3. Measured with load shown in Figure 10 on page 19.
4. Input pulse rise and fall times equal 10ns
CEI propagation delay
M41T315Y 10 ns
M41T315V/W 15 ns
V
CC
V
BAT
0.2V
V
BAT
0.2V
CEI
CEO
tPD
tF
tPF
tR
tREC
tPD
V
SO
tFB
V
PFD
(max)
V
PFD
(min)
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