ELECTRICALCHARACTERISTICS (continued)
Symbol Parameter Test Condition Min. Typ. Max. Unit
CKI,LO,RX Internal output capacities 20 pF
fLI-LO
fK-RX
fTX-K
Transmission frequency 9V < VS< 16V,
(external loads)
Tmin ≥20 ⋅RKO ⋅CK-Kline
130 kHz
fLI-LO
fK-RX
fTX-K
Rise Time for the definition of tr, tf see
FIG. 1, 2) 0.4 2 µs
Fall Time 9V < VS< 16V,
(external loads)
Tmin ≥20 ⋅RKO ⋅CK-Kline
0.4 2 µs
tOFF,LI-LO
tOFF,K-RX
tOFF,TX-K
Switch OFF time for the definition of tr, tf see
FIG. 1 1.3 3 µs
tON,LI-LO
tON,K-RX
tON,TX-K
Switch ON time 9V < VS< 16V,
(external loads)
Tmin ≥20 ⋅RKO ⋅CK-K
line
1.3 3 µs
tdSB ON
tdSB OFF
Standby reaction time VTX = 0V, IK ≥7mA
VLI = 0V, 9V < VS < 16V
see FIG. 2
10
20
20
40
µs
µs
Note 2) Speed limitation related to external capacitance CextRX, LO andinternal impedance CLO,RX, RLO,RRX for rise time.
tr=R
LO,RX ⋅(CLO,RX +C
extRX,LO)⋅1.38.
Note 3) In case of spikes on VCC ≥0.5V KOUT will be switched On for typical 10µs which represents the standby tdSB reaction time.
FUNCTIONAL DESCRIPTION
The L9613B is a monolithic bus driver designedto provide bidirectional serial communication in automo-
tiveapplications.
The device provides a bidirectional link, called K, to the VBat related diagnosis bus. It also includes a
separate comparator L which is also able to be linked to the VBat bus. The input TX and output RX of K
are related to VCC with her integrated pull up resistances. Also the L comparatoroutput LO has a pull
up resistanceconnectedto 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 OFFthe K output if the chip temperatureincreases above the thermalshut down threshold. To
reactivate K again the chip temperature must decrease below the K switch ON temp. To achieveno 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 featurestogether with a high possi-
ble baud rate >130Kbaud, controlled output slopes for low EMI, a wide power supply voltage range and
a real standby function with zero power consumption ISSB typ ≤1µA during system depowering VCC
≤0.5V makethis devicehigh efficientfor automotivebus system.
After wake up of the system from SB condition the first output signal will have an additional delay time
tdtyp ≤5µs.
The typical output voltage behaviour for the K, LO, RX outputs as a function of the output current is
shown in Fig.5. Fig.6 showsa waveformof theoutput signal when the low level changes from RON ⋅IOUT
to IOUT ⋅2⋅RON +U
BE state. This variation occurs due to too low output current or after a negativetran-
sient forcedto the outputor to the supplyvoltage line.
L9613B
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