STM1404_08 datasheet(27/35 Pages) STMICROELECTRONICS

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STM1404

DC and AC parameters

27/36

VOHB

VOH battery backup

(Vccsw)

ISOURCE = 100 µA

0.8VBAT

Pull-up supply voltage

(open drain)

RST, SAL, BLD, PFO

3.6

Power-fail comparator

VPFI

PFI input threshold

PFI falling (VCC < 3.6 V)

1.212

1.237

1.262

PFI hysteresis

PFI rising (VCC < 3.6 V)

tPFD

PFI to PFO

propagation delay

2µs

Battery switchover

VSO

Battery backup

switchover voltage (6)(7)

Power-

down

VBAT > VSW

VSW

VBAT < VSW

VBAT

Power-up

VBAT > VSW

VSW

VBAT < VSW

VBAT

VSW

2.4

Hysteresis

Battery low voltage detect

VDET

Battery detect

threshold

On power-

up only

2.25

2.30

2.34

2.45

2.50

2.55

3.14

3.20

3.26

Voltage reference (option for STM1404A)(8)

VREF

Voltage reference (see

Section 2.9: VREF,

reference voltage

output (1.237, typ) on

page 13)

0°C to 85°C

1.212

1.237

1.262

–40° to 0°C

1.200

1.237

1.274

IREF+

Source current

0°C to 85°C

µA

–40° to 0°C

µA

IREF–

Sink current

µA

Output voltage noise

f = 100 Hz to 100 kH

10-100

µVrms

Table 6.

DC and AC characteristics (continued)

Sym

Alter-

native

Description

Test condition(1)

Min

Typ

Max

Unit

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