DC and AC parameters

M41T256Y

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Table 8.

DC characteristics

Table 9.

Crystal electrical characteristics (externally supplied)

Sym

Parameter

1.

Min

Typ

Max

Unit

Battery current OSC ON

1.5

1.9

µA

Battery current OSC OFF

1.0

1.4

µA

f = 400kHz

1.4

3.0

mA

1.0

2.5

mA

Input leakage current

0V

±1

µA

(2)

2.

Outputs deselected.

Output leakage current

0V

±1

µA

Input high voltage

V

Input high voltage in battery

back-up for tamper pin

V

Input low voltage

–0.3

V

2.5

3.5

V

V

Output low voltage

0.4

V

Output low voltage (open

3.

For RST and FT pin (open drain).

0.4

V

4.20

4.50

V

V

Switch resistance on tamper

pin

500

W

Symbol

1.

Load capacitors are integrated within the M41T256Y. Circuit board layout considerations for the 32.768kHz crystal of

minimum trace lengths and isolation from RF generating signals should be taken into account.

Typ

Min

Max

Unit

Resonant frequency

32.768

kHz

Series resistance

35

k

Ω

Load capacitance

12.5

pF