196 DLC

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Vishay BCcomponents

Revision: 14-Mar-12

5

Document Number: 28362

THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT

DISCHARGE CHARACTERISTICS

Backup time of 196 DLC series capacitors depends on

minimum memory holding voltage and discharge current

(corresponding with the current consumption of the load).

For minimum backup times of standard and vertical

miniaturized series see Figures 8 and 9 (charging time

 24 h).

Fig. 8 - Typical backup time as a function of discharge current

Fig. 9 - Typical backup time as a function of discharge current

Figure 10 shows the backup time when a 196 DLC capacitor

is discharged by a constant resistance

(charging time

 24 h).

The horizontal axis shows the initial value of discharge

current if 5 V is connected to the capacitor via a fixed series

resistor.

Example:

1 μA

corresponds

to

5 M

 and 0.1 μA

corresponds to 50 M



The vertical axis shows that period of time during which the

voltage drops from 5 V to 2 V.

Fig. 10 - Typical backup time as a function

of initial discharge current

10

MGA695

1

10

3

10

2

10

Backup

time

(s)

Discharge current (mA)

10

-3

10

-2

10

-1

5

4

3

2

1

Curve 1: 1.0 F, 5.5 V

Curve 2: 0.47 F, 5.5 V

Curve 3: 0.22 F, 5.5 V

Curve 4: 0.1 F, 5.5 V

Curve 5: 0.047 F, 5.5 V

Voltage drop from 5.0 V to 3.5 V

10

1

10

4

10

3

10

4

Backup

time

(s)

Discharge current (mA)

10

-3

10

-2

10

-1

MGA696

5

4

3

2

1

Curve 1: 1.0 F, 5.5 V

Curve 2: 0.47 F, 5.5 V

Curve 3: 0.22 F, 5.5 V

Curve 4: 0.1 F, 5.5 V

Curve 5: 0.047 F, 5.5 V

Voltage drop:

from 5.0 V to 2.0 V

10

3

10

10

2

10

2

10

1

Backup

time

(s)

Initial value discharge current (mA)

10

-2

10

-1

1

MLB203

1

2

3

4

5

Curve 1: 1.0 F, 5.5 V

Curve 2: 0.47 F, 5.5 V

Curve 3: 0.22 F, 5.5 V

Curve 4: 0.1 F, 5.5 V

Curve 5: 0.047 F, 5.5 V

Voltage drop from 5.0 V to 2.0 V

by means of a fixed resistor