M41T256YMT7E Просмотр технического описания (PDF) - STMicroelectronics

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производитель

M41T256YMT7E

256 Kbit (32K x8) Serial RTC

STMicroelectronics 

M41T256Y

Table 8. DC Characteristics

Sym

Parameter

Test Condition(1)

Min Typ Max Unit

Battery Current OSC ON

IBAT

Battery Current OSC OFF

TA = 25°C, VCC = 0V, VBAT = 3.0V

1.5

1.9

µA

1.0

1.4

µA

ICC1 Supply Current

f = 400kHz

1.4

3.0

mA

ICC2 Supply Current (Standby)

SCL, SDA = VCC – 0.3V

1.0

2.5

mA

ILI Input Leakage Current

0V ≤ VIN ≤ VCC

±1

µA

ILO(2) Output Leakage Current

0V ≤ VOUT ≤ VCC

±1

µA

VIH Input High Voltage

0.7VCC

VCC + 0.3 V

VIHB

Input High Voltage in Battery Back-

up for Tamper Pin

VBAT –

Vdiode

VBAT

V

VIL Input Low Voltage

–0.3

0.3VCC

V

VBAT Battery Voltage

2.5

3.5

V

VOH Output High Voltage

VCC + 0.3 V

Output Low Voltage

VOL

Output Low Voltage (Open Drain)(3)

IOL = 3.0mA

IOL = 10mA

0.4

V

0.4

V

VPFD Power Fail Deselect

4.20

4.50

V

VSO Battery Back-up Switchover

VBAT

V

RSW Switch Resistance on Tamper Pin

500

Ω

Note: 1. Valid for Ambient Operating Temperature: TA = –25 to 70°C; VCC = 4.5 to 5.5V (except where noted).

2. Outputs deselected.

3. For RST and FT pin (Open Drain).

Table 9. Crystal Electrical Characteristics (Externally Supplied)

Symbol

Parameter(1,2)

Typ

Min

Max

Unit

f0

Resonant Frequency

32.768

kHz

RS

Series Resistance

35

kΩ

CL

Load Capacitance

12.5

pF

Note: 1. 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 kouhou@kdsj.co.jp or ht-

tp://www.kdsj.co.jp for further information on this crystal type.

2. 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.

20/27

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