ELECTRICAL CHARACTERISTICS (continued)

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

Internal output capacities

20

pF

Transmission frequency

(external loads)

130

kHz

Rise Time

for the definition of tr, tf see

FIG. 1,

2)

0.4

2

µs

Fall Time

(external loads)

0.4

2

µs

Switch OFF time

for the definition of tr, tf see

FIG. 1

1.3

3

µs

Switch ON time

(external loads)

Tmin

1.3

3

µs

Standby reaction time

VTX = 0V, IK

≥ 7mA

VLI = 0V, 9V < VS < 16V

see FIG. 2

10

20

20

40

µs

µs

Note 3) In case of spikes on VCC

FUNCTIONAL DESCRIPTION

The L9613B is a monolithic bus driver designed to provide bidirectional serial communication in automo-

tive applications.

are related to VCC with her integrated pull up resistances. Also the L comparator output LO has a pull

up resistance connected to VCC.

All VBat bus defined inputs LI and K have supply voltage dependent thresholds together with sufficent

hysteresis to suppress line spikes. These pins are protected against overvoltages, shorts to GND and

VS and can also be driven beyond VS and GND. These features are also given for TX, RX and LI only

taking into account the behaviour of the internal pull up resistances. The thermal shut down function

switches OFF the K output if the chip temperature increases above the thermal shut down threshold. To

reactivate K again the chip temperature must decrease below the K switch ON temp. To achieve no fault

for VS undervoltage conditions the outputs will be switched OFF and stay at high impedance. The de-

vice is also protected against reverse battery condition. During lack of VS or GND all pins shows high

impedance characteristic. To realize a lack of the VS related bus line LI and K the outputs LO and RX

shows defined ON status. Supressing all 4 classes of ”Schaffner” signals (Schaffner 1; 2; 3a,b; 4) all

pins can be load with short energy pulses of max.

±0.2mJ. All these features together with a high possi-

ble baud rate >130Kbaud, controlled output slopes for low EMI, a wide power supply voltage range and

≤ 1µA during system depowering VCC

≤0.5V make this device high efficient for automotive bus system.

After wake up of the system from SB condition the first output signal will have an additional delay time

≤ 5µs.

The typical output voltage behaviour for the K, LO, RX outputs as a function of the output current is

sient forced to the output or to the supply voltage line.

L9613B

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