M41ST87Y datasheet(37/42 Pages) STMICROELECTRONICS

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M41ST87Y, M41ST87W

Table 17. 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. Not including Tamper Detection Current (see Table 4., page 18).

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 PFO1 and PFO2 (if PFOD = '0'), SQW/FT (if SQWOD = '0'), and TPCLR 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. TPCLR output can source –300µA (typ) for VBAT = 2.9V.

10. For IRQ/OUT, SQW/FT (if SQWOD = '1'), PFO1 and PFO2 (if PFOD = '1'), RST, SDA, and F32k pins (Open Drain).

Sym

Parameter

Test Condition(1)

M41ST87Y

M41ST87W

Unit

Min

Typ

Max

Min

Typ

Max

IBAT

(2)

Battery Current

OSC ON

TA = 25°C, VCC = 0V,

VBAT = 3V

500

700

500

700

Battery Current

OSC OFF

ICC1

Supply Current

f = 400kHz

1.4

0.75

ICC2

Supply Current

(Standby)

SCL, SDA = VCC –

0.3V

10.50

ILI

(3)

Input Leakage

Current

≤ VIN ≤ VCC

±1

µA

Input Leakage

Current (PFI)

–25

ILO

(4)

Output Leakage

Current

≤ VIN ≤ VCC

±1

µA

IOUT1

(5)

VOUT Current

(Active)

VOUT1 > VCC – 0.3V

175

100

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

VIL

Input Low Voltage

–0.3

0.3VCC

–0.3

0.3VCC

VBAT

Battery Voltage

2.5

3.0

3.5(6)

2.5

3.0

3.5(6)

VOH

(7)

Output High Voltage

IOH = –1.0mA

2.4

Pull-up Supply

Voltage (Open

Drain)

IRQ/OUT, RST, F32k

5.5

3.6

VOHB

(8)

VOH (Battery Back-

up)

IOUT2 = –1.0µA

(9)

2.9

VOL

Output Low Voltage

IOL = 3.0mA

0.4

Output Low Voltage

(Open Drain)(10)

IOL = 10mA

0.4

VPFD

Power Fail Deselect

THS Bit = 0

4.20

4.35

4.50

2.55

2.62

2.70

THS Bit = 1

4.50

4.60

4.75

2.80

2.88

3.00

VPFI1

PFI Input Threshold

VCC = 5V(Y)

VCC = 3V(W)

1.225

1.250

1.275

1.225

1.250

1.275

PFI Hysteresis

PFI Rising

VPFI2

PFI Input Threshold

VCC = 5V(Y)

VCC = 3V(W)

1.225

1.250

1.275

1.225

1.250

1.275

PFI Hysteresis

PFI Rising

VSO

Battery Back-up

Switchover

2.5

RSW

Switch Resistance

on Tamper Pin

500

Ω

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