17/21

STM6321/6322/6821/6822/6823/6824/6825

versions; and VCC = 2.1V to 2.75V for “Z” version (except where noted).

3. WDI input is designed to be driven by a three-state output device. To float WDI, the “high-impedance mode” of the output device

must have a maximum leakage current of 10µA and a maximum output capacitance of 200pF. The output device must also be able

to source and sink at least 200µA when active.

4. WDI is internally serviced within the watchdog period if WDI is left unconnected.

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

6. Contact local sales office for availability.

Reset Thresholds

(5)

Reset Threshold

STM6xxxL

25°C

4.561

4.630

4.699

V

–40 to 85°C

4.514

4.746

V

STM6xxxM

25°C

4.314

4.390

4.446

V

–40 to 85°C

4.270

4.490

V

STM6xxxT

25°C

3.040

3.080

3.110

V

–40 to 85°C

3.000

3.150

V

STM6xxxS

25°C

2.890

2.930

2.960

V

–40 to 85°C

2.857

3.000

V

STM6xxxR

25°C

2.590

2.630

2.660

V

–40 to 85°C

2.564

2.696

V

25°C

2.280

2.320

2.350

V

–40 to 85°C

2.250

2.380

V

Reset Threshold

Hysteresis

L/M versions

10

mV

T/S/R/Z versions

5

mV

20

µs

Reset Pulse Width

140

200

280

ms

Reset Threshold

Temperature Coefficient

40

ppm/

°C

Push-button Reset Input

MR Pulse Width

1

µs

MR to RST Output Delay

500

ns

MR Glitch Immunity

100

ns

MR Pull-up Resistor

35

52

75

k

Ω

Watchdog Timer

Watchdog Timeout

Period

1.12

1.60

2.24

s

WDI Pulse Width

50

ns

Sym

Alter-

native

Description

Min

Typ

Max

Unit