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Features
* * * * * *
Six Input Comparators with Schmitt-trigger Characteristics Input Clamping Current Capability of 10 mA Integrated Protection Cells (EMC, ESD, RF) Dedicated to All Input Stages Common Shutdown by Junction-temperature Monitor Reset with Hysteresis at Low Voltage ESD Protection According to Human Body Model: 2000 V (C = 100 pF, R = 1.5 kW) * Output Stages: - Short-circuit Protected - Load-dump Protected at 1 kW - No Crosstalk on Adjacent Channels - Jump Start Possible
Hex Driver IC with Thermal Monitoring U6805B
Description
The hex driver IC U6805B includes 6 non-inverted and current-limited output stages with an open collector. Common thermal shutdown protects outputs against critical junction temperature. Each output can sink a current of 20 mA, and parallel output operation is possible. The digital inputs have Schmitt-trigger function with pull-up resistors of up to 5 V.
Figure 1. Block Diagram
VO1 1 3 VO2 VO3 4
VS
7
Thermal shutdown
2
GND
Undervoltage detection VS = 5 V 8 VI1 6 VI2 5 VI3 VS
Rev. 4763A-AUTO-11/03
Pin Configuration
Figure 2. Pinning SO14
VO1
1
14 VI1
VO2
2
13 VI2
VO3
3
12
VI3
GND
4
11
VS
VO4
5
10
VI4
VO5
6
9
VI5
VO6
7
8
VI6
Pin Description
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Symbol VO1 VO2 VO3 GND VO4 VO5 VO6 VI6 VI5 VI4 VS VI3 VI2 VI1 Function Output 1 Output 2 Output 3 Ground Output 4 Output 5 Output 6 Input 6 Input 5 Input 4 Supply voltage, 5 V Input 3 Input 2 Input 1
2
U6805B
4763A-AUTO-11/03
U6805B
Basic Circuitry
The integrated circuit U6805B requires a stabilized supply voltage (VS = 5 V 5%) to comply with its electrical characteristics. An external buffer capacitor of C = 100 nF is recommended. An integrated 14 V Z diode between VS and ground protects the supply pin. All input stages are provided with an integrated 250 kW pull-up resistor and can be directly connected to a microcontroller. All output stages are open collectors, each capable of sinking 20 mA. Recommended external components: Pull-up resistor, R = 1 kW Capacitor to GND, C = 470 pF, see Figure 3 on page 4
Functional Description
General
ON state: Low level at the input stage activates the corresponding output stage. OFF state: The internal pull-up resistor provides high level to the input comparator and deactivates the output stage. 7 V Zener diodes between each input pin and GND are capable of 10 mA clamping current 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 and Overtemperature Shutdown Transients and Load Dump
A temperature-dependent current limitation in the range of 25 to 100 mA protects the stages in case of a short-circuit. Additionally, the chip temperature is monitored. If Tchip > 148C, all outputs are disabled and automatically enabled with a hysteresis of DTChip > 5 K. Refer to the hex driver U6807B if the temperature shutdown feature is not required. An integrated 28 V Zener diode protects each output stage against transients and load dump (Schaffner pulses). With the help of an external 1 kW resistor, the output transistor is capable of handling the corresponding current which flows during each of these conditions. Apart from that, the outputs are short-circuit and overload protected. When the 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 Vhyst = 0.5 V typically.
Low-voltage Detection
3
4763A-AUTO-11/03
Figure 3. Application Schematic
VS = 5 V VBatt Load 100 nF VI1 VI2 VI3 Microcontroller VI4 VI5 VI6 VO1 VO2 VO3 R R R R R R 6 x 1 k
U6805B
VO4 VO5 VO6 C C C C C C 6 x 470 pF
Absolute Maximum Ratings
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Parameters Supply voltage Ambient temperature range Storage temperature range Maximum junction temperature Symbol VS Tamb Tstg Tj Value 7.0 -40 to +125 -50 to +150 +150 Unit V C C C
Thermal Resistance
Parameters Junction ambient Symbol RthJA Value 120 Unit K/W
4
U6805B
4763A-AUTO-11/03
U6805B
Electrical Characteristics
VS = 5 V 5%, Tamb = 27C, reference point pin 4 (GND), unless otherwise specified, see Figure 1 on page 1
Parameters Supply, Pin 11 Supply voltage Supply current Low-voltage detection threshold Low-voltage hysteresis Temperature shutdown Temperature shutdown hysteresis Inputs; Pins 8, 9, 10, 12, 13 and 14 Z-diode protection voltage Z-diode clamping current Pull-up resistor Switching threshold Hysteresis Outputs; Pins 1, 2, 3, 5, 6 and 7 Z-diode protection voltage Integrated capacitor Leakage current Saturation voltage Current limitation Propagation delay 470 pF, 1 kW, 20 V IO = 20 mA ILeak VSat Ilimit td 25 IO = 10 mA VO 26.5 5 2.5 0.7 100 5 V pF A V mA s OFF ON II = 10 mA VI II RI VI VI Vhyst 170 250 3.3 1.8 1.5 6.7 8.5 10 305 V mA kW V V V Inputs open Inputs switched to GND ON OFF VS IS IS VTH(ON) VTH(OFF) Vhyst TChip Thyst 4.75 0.8 7 3.7 3.0 0.55 140 5 5.25 3.2 13 4.6 3.8 1.05 149 V mA mA V V V C C Test Conditions Symbol Min. Typ. Max. Unit
5
4763A-AUTO-11/03
Ordering Information
Extended Type Number U6805B-FP Package SO14 Remarks -
Package Information
Package SO14
Dimensions in mm
8.75 5.2 4.8 3.7
1.4 0.4 1.27 7.62 14 8 0.25 0.10 0.2 3.8 6.15 5.85
technical drawings according to DIN specifications
1
7
6
U6805B
4763A-AUTO-11/03
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4763A-AUTO-11/03

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