Rev. 4763A–AUTO–11/03
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
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
Under-
voltage
detection VS = 5 V
7
1 3 4
856
2
VS
VI3
GND
Thermal
shutdown
VI2
VI1
VS
VO1 VO2 VO3
Hex Driver IC
with Thermal
Monitoring
U6805B
2U6805B
4763A–AUTO–11/03
Pin Configuration
Figure 2. Pinning SO14
1
2
3
4
14
13
12
11
VO1
5
6
7
GND
10
9
8
VO2
VO3
VO4
VO5
VO6
VI1
VI2
VI3
VS
VI4
VI5
VI6
Pin Description
Pin Symbol Function
1 VO1 Output 1
2 VO2 Output 2
3 VO3 Output 3
4 GND Ground
5 VO4 Output 4
6 VO5 Output 5
7 VO6 Output 6
8 VI6 Input 6
9 VI5 Input 5
10 VI4 Input 4
11 VS Supply voltage, 5 V
12 VI3 Input 3
13 VI2 Input 2
14 VI1 Input 1
3
U6805B
4763A–AUTO–11/03
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
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 >148°C, 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.
Transients and Load
Dump
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 condi-
tions. Apart from that, the outputs are short-circuit and overload protected.
Low-voltage Detection 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.
4U6805B
4763A–AUTO–11/03
Figure 3. Application Schematic
VS = 5 V
U6805B
VO1
C C C
RRR
VBatt
Load
100 nF
Micro-
controller
RRR
C
6 × 470 pF
C C
6 × 1 kΩ
VO2
VO3
VO4
VO5
VO6
VI6
VI5
VI4
VI3
VI2
VI1
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 Symbol Value Unit
Supply voltage VS7.0 V
Ambient temperature range Tamb -40 to +125 °C
Storage temperature range Tstg -50 to +150 °C
Maximum junction temperature Tj+150 °C
Thermal Resistance
Parameters Symbol Value Unit
Junction ambient RthJA 120 K/W
5
U6805B
4763A–AUTO–11/03
Electrical Characteristics
VS = 5 V ± 5%, Tamb = 27°C, reference point pin 4 (GND), unless otherwise specified, see Figure 1 on page 1
Parameters Test Conditions Symbol Min. Typ. Max. Unit
Supply, Pin 11
Supply voltage VS4.75 5.25 V
Supply current Inputs open
Inputs switched to GND
IS
IS
0.8
7
3.2
13
mA
mA
Low-voltage detection threshold ON
OFF
VTH(ON)
VTH(OFF)
3.7
3.0
4.6
3.8
V
V
Low-voltage hysteresis Vhyst 0.55 1.05 V
Temperature shutdown TChip 140 149 °C
Temperature shutdown hysteresis Thyst 5°C
Inputs; Pins 8, 9, 10, 12, 13 and 14
Z-diode protection voltage II = 10 mA VI6.7 8.5 V
Z-diode clamping current II±10 mA
Pull-up resistor RI170 250 305 kW
Switching threshold OFF
ON
VI
VI
3.3
1.8
V
V
Hysteresis Vhyst 1.5 V
Outputs; Pins 1, 2, 3, 5, 6 and 7
Z-diode protection voltage IO = 10 mA VO26.5 V
Integrated capacitor 5pF
Leakage current ILeak 2.5 µA
Saturation voltage IO = 20 mA VSat 0.7 V
Current limitation Ilimit 25 100 mA
Propagation delay 470 pF, 1 kW, 20 V td5µs
6U6805B
4763A–AUTO–11/03
Package Information
Ordering Information
Extended Type Number Package Remarks
U6805B-FP SO14 –
technical drawings
according to DIN
specifications
Package SO14
Dimensions in mm
0.25
0.10
8.75
0.4
1.27
7.62
1.4
5.2
4.8
3.7
3.8
6.15
5.85
0.2
14 8
17
Printed on recycled paper.
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errors which may appear in this document, reserves the right to change devices or specifications detailed herein at any time without notice, and
does not make any commitment to update the information contained herein. No licenses to patents or other intellectual property of Atmel are
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as critical components in life support devices or systems.
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4763A–AUTO–11/03
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