SA555 datasheet(6/20 Pages) STMICROELECTRONICS

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Electrical characteristics

NE555 - SA555 - SE555

6/20

Idis(off)

Discharge pin leakage current

(output high) Vdis = 10V

100

Vdis(sat)

Discharge pin saturation voltage

(output low) (4)

VCC = +15V, Idis = 15mA

VCC = +5V, Idis = 4.5mA

180

480

200

180

480

200

Output rise time

Output fall time

100

200

100

300

toff

Turn off time (5) (Vreset = VCC)0.5

0.5

µs

Tested at VCC = +5V and VCC = +15V.

This will determine the maximum value of RA + RB for 15V operation. The maximum total (RA + RB) is 20MΩ for 15V

operation and 3.5M

Ω for +5V operation.

Specified with trigger input high.

No protection against excessive pin 7 current is necessary, providing the package dissipation rating is not exceeded.

Time measured from a positive pulse (from 0V to 0.8xVCC) on the Threshold pin to the transition from high to low on the

Output pin. Trigger is tied to Threshold.

Table 3.

Tamb = +25°C, VCC = +5V to +15V (unless otherwise specified)

Symbol

Parameter

SE555

NE555 - SA555

Unit

Min.

Typ.

Max.

Min.

Typ.

Max.

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