M41ST84W View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

M41ST84W

3.0/3.3 V I2C serial RTC with 44 bytes of NVRAM and supervisory functions

STMicroelectronics 

M41ST84W

DC and AC parameters

Table 12. DC characteristics

Sym

Parameter

Test condition(1)

M41ST84W

Unit

Min

Typ

Max

Battery current OSC ON

IBAT Battery current OSC OFF

ICC1 Supply current

ICC2 Supply current (standby)

ILI(2)

ILO(3)

VIH

VIL

VBAT

VOH

VOL

Input leakage current

Input leakage current (PFI)

Output leakage current

Input high voltage

Input low voltage

Battery voltage

Output high voltage(5)

Output low voltage

Output low voltage (open drain)(6)

Pull-up supply voltage (open

drain)

TA = 25°C, VCC = 0 V,

VBAT = 3 V

f = 400 kHz

SCL, SDA = VCC – 0.3 V

or VSS + 0.3 V

0V ≤ VIN ≤ VCC

0V ≤ VOUT ≤ VCC

IOH = –1.0mA

IOL = 3.0mA

IOL = 10mA

RST, IRQ/FT/OUT

–25

0.7VCC

–0.3

2.5

2.4

400

500

nA

50

nA

0.75

mA

0.50

mA

±1

µA

2

25

nA

±1

µA

VCC + 0.3 V

0.3VCC

V

3.0

3.5(4)

V

V

0.4

V

0.4

V

3.6

V

VPFD

VPFI

Power fail deselect

PFI input threshold

PFI hysteresis

VCC = 3V(W)

PFI Rising

2.55 2.60

2.70

V

1.225 1.250 1.275

V

20

70

mV

VSO Battery backup switchover

2.5

V

1. Valid for ambient operating temperature: TA = –40 to 85°C; VCC = 2.7 to 3.6 V (except where noted).

2. RSTIN internally pulled-up to VCC through 100 KΩ resistor. WDI internally pulled-down to VSS through 100 KΩ resistor.

3. Outputs deselected.

4. For rechargeable backup, VBAT (max) may be considered VCC.

5. For PFO and SQW pins (CMOS).

6. For IRQ/FT/OUT, RST pins (open drain): if pulled-up to supply other than VCC, this supply must be equal to, or less than

3.0 V when VCC = 0 V (during battery backup mode).

Table 13. Crystal electrical characteristics (externally supplied)

Symbol

Parameter(1)(2)

Typ

Min

Max

Unit

f0

Resonant frequency

RS

Series resistance

CL

Load capacitance

32.768

12.5

kHz

50

kΩ

pF

1. Load capacitors are integrated within the M41ST84W. 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.

2. 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

http://www.kds.info/index_en.htm for further information on this crystal type.

29/34

Share Link: