Figure 48. Rise time vs. pull-up resistor

100

10

1

1E+2

1E+3

Rpullup (kΩ)

Vcc = 5V

Vicm = Vcc/2

Overdrive = 100mV

T = 25°C

Vcc = 3.3V

Vcc = 1.8V

Fail-safe characteristic

The TS3121 features a fail-safe characteristic. When the comparator is not powered on (VCC = 0 V), the fail-safe

design allows bias voltages on the input and output pins. The following graph shows the characteristic of bias

current versus voltage for the input pins when VCC = 0 V.

Figure 49. Fail-safe bias current vs. voltage

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0

0

20

40

60

80

100

120

140

160

180

200

0

5

10

15

20

25

30

35

40

45

50

Input Voltage (V)

T = -40°C

T = 25°C

T = 125°C

Input current vs Input voltage

Vcc connected to GND

Negative input

TS3121, TS3121A

Application information

DS14484 - Rev 2

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