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

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

Resonant frequency

32.768

kHz

Series resistance

60

k

Ω

Load capacitance

12.5

pF

Table 11.

Power down/up trip points DC characteristics

Symbol

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

1.5

2.5

ms

300

µs

10

µs

0

µs

CEI high to power-fail

0

µs

(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

VCC

VBAT

0.2V

VBAT

0.2V

CEI

CEO

tPD

tF

tPF

tR

tREC

tPD

VSO

tFB

VPFD (max)

VPFD (min)

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