U6807B

TELEFUNKEN Semiconductors

Rev. A2, 28-Apr-97

2 (5)

Pin Description

1

2

3

4

14

13

12

11

13335

5

6

7

GND

10

9

8

V

I4

V

O4

Figure 2. Pinning

Pin

Symbol

Function

1

Output 1

2

Output 2

3

Output 3

4

GND

Ground

5

Output 4

6

Output 5

7

Output 6

8

Input 6

9

Input 5

10

Input 4

11

Supply voltage, 5 V

12

Input 3

13

Input 2

14

Input 1

Basic Circuitry

The integrated circuit, U6805B, requires a stabilized sup-

"5%) to comply with its electrical

characteristics. An external buffer capacitor of C = 100 nF

value is recommended. An integrated 14-V Z-diode

All input stages are provided with an integrated 250 k

W

pull-up resistor and can be directly connected to a micro-

controller.

All output stages are open collectors each capable of

sinking 20 mA. Recommended external components:

Pull–up resistor, R = 1 k

W

Capacitor to GND, C = 470 pF, see figure 3

Functional Description

General

ON state: Low level at the input stage activates the

corresponding output stage.

OFF state: The internal pull-up resistor gives high level

to the input comparator and deactivates the output stage.

7 V Z-diodes between each input pin and GND are

capable of

"10 mA clamping currents without crosstalk

on adjacent input stages.

A total clamping current of

"30 mA should be observed

with respect to the power dissipation.

Current Limitation of the

Output Stages

A temperature dependent current limitation between

25 mA and 100 mA protects the stages during a short.

and/or a further reduction of the maximum ambient

temperature is recommended in order to avoid thermal

overstress. Depending on the numbers of output stages

which may be in short circuit condition these maximum

x 80°C @ 2 channels shorted simultaneously

x 65°C @ 3 channels shorted simultaneously

Refer to hexdriver U6805B if thermal shut down is

required.

Transients and Load-Dump

An integrated 28-V Z-diode protects each output stage

against transients and load-dump (Schaffner pulses).

With the help of external 1-k

W resistor , the output

transistor is capable of the corresponding current which

flows during each of these conditions. Apart from that,

outputs are short circuit and overload protected.

Low Voltage Detection

When supply voltage is switched on, a power-on reset

pulse is generated internally, which disables all output

stages until a defined supply voltage level is reached. The

low voltage detection is provided with a hysteresis of