STM6905 datasheet(13/19 Pages) STMICROELECTRONICS

13 / 19 page

STM6905

DC and AC parameters

13/19

VHYST

Reset threshold

hysteresis

Referenced to VRST1/VRST2

typical

0.5

tRD

VCC to RST delay

VCC = (VRST1 + 100 mV) to

(VRST1 – 100 mV)

µs

V2IN = (VRST2 + 75 mV) to

(VRST2 – 75 mV)

µs

tREC

tRP

RST time-out period

Option B(5)

Option C(5)

120

180

Option E

140

210

280

Option F(5)

280

420

560

Adjustable reset comparator input (V3IN, V4IN, V5IN)

VRSTIN

V3IN, V4IN, V5IN input

threshold

589

600

611

IRSTIN

V3IN, V4IN, V5IN input

current

V3IN, V4IN, V5IN > 0.8 V

–25

+25

V3IN, V4IN, V5IN

hysteresis

3mV

tRSTIND

V3IN, V4IN, V5IN to

RST output delay

VRSTIN to (VRSTIN – 30 mV)

µs

Manual (push-button) reset input

VIL

MR input voltage

0.3 x VCC

VIH

0.7 x VCC

tMLMH

tMR

MR minimum pulse

width

1µs

tMLRL

tMRD

MR to RST output delay

200

MR glitch immunity

100

MR pull-up resistance

Valid for ambient operating temperature: TA = –40°C to +85°C; VCC = 0.8 V to 5.5 V (except where noted).

10k ohm (typ) internal pull-up resistor.

The leakage current measured on the RST pin is tested with the reset de-asserted (output high impedance).

Other reset threshold voltages are offered. Minimum order quantities may apply. Contact local sales office for availability.

Other tREC time-out periods are offered. Minimum order quantities may apply. Contact local sales office for availability.

Table 4.

DC and AC characteristics (continued)

Sym

Alter-

native

Description

Test condition(1)

Min

Typ

Max

Unit

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