TLC27M4, TLC27M4A, TLC27M4B, TLC27M4Y, TLC27M9

LinCMOS

™ PRECISION QUAD OPERATIONAL AMPLIFIERS

SLOS093C – OCTOBER 1987 – REVISED MAY 1999

34

POST OFFICE BOX 655303

APPLICATION INFORMATION

latch-up (continued)

The current path established if latch-up occurs is usually between the positive supply rail and ground; it can be

triggered by surges on the supply lines and/or voltages on either the output or inputs that exceed the supply

voltage. Once latch-up occurs, the current flow is limited only by the impedance of the power supply and the

forward resistance of the parasitic thyristor and usually results in the destruction of the device. The chance of

latch-up occurring increases with increasing temperature and supply voltages.

R2

68 k

Ω

2.2 nF

C2

VO

1N4148

470 k

Ω

100 k

Ω

C1

2.2 nF

68 k

Ω

R1

47 k

Ω

100 k

Ω

1

µF

100 k

Ω

5 V

1/4

TLC27M4

NOTE: VOPP ≈ 2 V

fO =

1

2

π √R1R2C1C2

Figure 44. Wien Oscillator

VI

R

5 V

IS

2N3821

–

+

1/4

TLC27M9

NOTE: VI = 0 V to 3 V

IS =

VI

R

Figure 45. Precision Low-Current Sink