M41ST95W datasheet(27/35 Pages) STMICROELECTRONICS

Part #	M41ST95W

Description	5.0 or 3.0V, 512 bit (64 bit X 8) Serial RTC (SPI) SRAM and NVRAM Supervisor

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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M41ST95Y*, M41ST95W

Table 13. DC Characteristics

Note: 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 with VOUT and ECON open.

3. RSTIN1 and RSTIN2 internally pulled-up to VCC through 100KΩ resistor. WDI internally pulled-down to VSS through 100KΩ resistor.

4. Outputs Deselected.

5. External SRAM must match RTC SUPERVISOR chip VCC specification.

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

7. For PFO, F32k, and SQW pins (CMOS).

8. Conditioned output (ECON) can only sustain CMOS leakage current in the battery back-up mode. Higher leakage currents will re-

duce battery life.

9. 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 3.0V when

VCC = 0V (during battery back-up mode).

Sym

Parameter

Test

Condition(1)

M41ST95Y

M41ST95W

Unit

Min

Typ

Max

Min

Typ

Max

IBAT

(2)

Battery Current OSC

ON

TA = 25°C,

VCC = 0V,

VBAT = 3V

400

550

400

550

nA

Battery Current OSC

OFF

50

nA

ICC1

Supply Current

f = 2MHz

2

mA

ICC2

Supply Current

(Standby)

SCL, SDI =

VCC – 0.3V

1.4

mA

ILI

(3)

Input Leakage Current

0V

≤ VIN ≤

VCC

±1

µA

Input Leakage Current

(PFI)

–25

2

25

–25

2

25

nA

ILO

(4)

Output Leakage

Current

0V

≤ VIN ≤

VCC

±1

µA

IOUT1

(5)

VOUT Current (Active)

VOUT1 >

VCC – 0.3V

175

100

mA

IOUT2

VOUT Current (Battery

Back-up)

VOUT2 >

VBAT – 0.3V

100

µA

VIH

Input High Voltage

0.7VCC

VCC + 0.3

0.7VCC

VCC + 0.3

V

VIL

Input Low Voltage

–0.3

0.3VCC

–0.3

0.3VCC

V

VBAT

Battery Voltage

2.5

3.0

3.5(6)

2.5

3.0

3.5(6)

V

VOH

Output High Voltage(7)

IOH = –1.0mA

2.4

V

Power Supply Voltage

(Open Drain)

IRQ/FT/OUT,

RST

5.5

3.6

V

VOHB

(8)

VOH (Battery Back-up)

IOUT2 =

–1.0µA

2.5

2.9

3.5

2.5

2.9

3.5

V

VOL

Output Low Voltage

IOL = 3.0mA

0.4

V

Output Low Voltage

(Open Drain)(9)

IOL = 10mA

0.4

V

VPFD

Power Fail Deselect

4.20

4.40

4.50

2.55

2.60

2.70

V

VPFI

PFI Input Threshold

VCC = 5V(Y)

VCC = 3V(W)

1.225

1.250

1.275

1.225

1.250

1.275

V

PFI Hysteresis

PFI Rising

20

70

20

70

mV

VSO

Battery Back-up

Switchover

2.5

V

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