M41T11 Просмотр технического описания (PDF) - STMicroelectronics

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производитель

M41T11

Serial real-time clock (RTC) with 56 bytes of NVRAM

STMicroelectronics 

DC and AC parameters

M41T11

Table 6.

Symbol

Capacitance

Parameter(1)(2)

Min

Max

CIN

Input capacitance (SCL)

7

COUT(3) Output capacitance (SDA, FT/OUT)

10

tLP

Low-pass filter input time constant (SDA and SCL)

250

1000

1. Effective capacitance measured with power supply at 5 V; sampled only, not 100% tested.

2. At 25°C, f = 1 MHz.

3. Outputs deselected.

Unit

pF

pF

ns

Table 7.

Symbol

DC characteristics

Parameter

Test Condition(1)

Min Typ Max Unit

ILI Input leakage current

0V ≤ VIN ≤ VCC

±1

µA

ILO Output leakage current

0V ≤ VOUT ≤ VCC

±1

µA

ICC1 Supply current

Switch frequency = 100 kHz

300 µA

ICC2 Supply current (standby) SCL, SDA = VCC – 0.3 V

70

µA

VIL Input low voltage

–0.3

0.3VCC V

VIH Input high voltage

0.7VCC

VCC + 0.5 V

VOL Output low voltage

IOL = 3 mA

0.4

V

Pull-up supply voltage

(open drain)

FT/OUT

5.5

V

VBAT(2) Battery supply voltage

2.5(3) 3

3.5(4)

V

IBAT Battery supply current

TA = 25°C, VCC = 0 V,

oscillator ON, VBAT = 3 V

0.8

1

µA

1. Valid for ambient operating temperature: TA = –40 to 85°C; VCC = 2.0 to 5.5 V (except where noted).

2. STMicroelectronics recommends the RAYOVAC BR1225 or BR1632 (or equivalent) as the battery supply.

3. After switchover (VSO), VBAT(min) can be 2.0 V for crystal with RS = 40 KΩ.

4. For rechargeable back-up, VBAT(max) may be considered VCC.

Table 8. Crystal electrical characteristics

Symbol

Parameter(1)(2)(3)

Min

Typ

Max

Unit

fO

Resonant frequency

RS Series resistance

32.768

kHz

60(4)

kΩ

CL Load capacitance

12.5

pF

1. These values are externally supplied if using the SO8 package. 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. Please refer to the KDS website for further information

on this crystal type.

2. Load capacitors are integrated within the M41T11. Circuit board layout considerations for the 32.768 kHz

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

3. All SNAPHAT® battery:crystal tops meet these specifications.

4. ESR (max) = 110 kΩ for VCC or VBAT > 2.5 V.

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Doc ID 6103 Rev 10

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