ST7GEME4 datasheet(16/28 Pages) STMICROELECTRONICS

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Electrical characteristics

ST7GEME4

16/28

4.3

Supply and reset characteristics

Table 11 characteristics are measured at T = 0 to +70 oC, VDD - VSS = 5.5 V unless

otherwise specified.

4.4

Clock and timing characteristics

4.4.1

General timings

Table 12 characteristics are measured at T = 0 to +70 oC unless otherwise specified.

Table 10.

LED pins characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

ILsink

Low current

VPAD > VDD-2.4

ILsink

High current

VPAD > VDD-2.4 for ROM

8.4

Table 11.

Low voltage detector and supervisor characteristics (LVDS)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VIT+

Reset release threshold

(VDD rising)

3.7

3.9

VIT-

Reset generation threshold

(VDD falling)

3.3

3.5

Vhys

Hysteresis VIT+ - VIT-

(1)

Hysteresis voltage between Schmitt trigger switching levels. Based on characterization results, not tested.

200

VtPOR

VDD rise time rate

ms/V

Table 12.

General timings

Symbol

Parameter

Conditions

Min

Typ(1)

Data based on typical application software.

Max

Unit

tc(INST) Instruction cycle time

tCPU

fCPU=4 MHz

500

750

3000

tv(IT)

Interrupt reaction time(2)

tv(IT) = ∆tc(INST) + 10

(3)

Time measured between interrupt event and interrupt vector fetch.

∆t

c(INST) is the number of tCPU cycles

needed to finish the current instruction execution.

∆t

INST is the number of tCPU to finish the current instruction execution.

tCPU

fCPU=4 MHz

2.5

5.5

µs

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