Table 3.Absolute maximum ratings (No damage or latch)
Symbol Parameter Value Unit
V
S
V
CC
ΔV
S/dt
V
LI, K
V
LO, RX, TX
Supply voltage ISO transients
t = 400 ms
Stabilized voltage -0.3 to +7 V
Supply voltage transient -10 to +10 V/µs
Pin voltage
-24 to +36
-24 to +40
V
-24 to VS V
-24 to VCC V
Note:Max. ESD voltages are ±2kV with human body model C = 100pF, R = 1.5k corresponds to
maximum energy dissipation 0.2mJ according to MIL883C.
2.2 Thermal data
Table 4.Thermal data
Symbol Parameter Min. Typ. Max. Unit
T
JSDon
T
JSDoff
R
th j-amb
Temperature K shutdown switch on threshold 160 -200 °C
Temperature K shutdown switch off threshold 150 -200 °C
Thermal steady state junction to ambient resistance 130 155 180 °C/W
2.3 Electrical characteristics
The electrical characteristics are valid within the below defined operating conditions, unless
otherwise specified. The function is guaranteed by design until T
temperature
JSDon
shutdown switch-on-threshold.
Table 5.Electrical characteristics
SymbolParameterTest conditionMin.Typ.Max.Unit
V
V
CC
T
I
CC
4/15Doc ID 1765 Rev 7
Supply voltage -4.5-36V
S
Stabilized voltage see note
Junction temperature --40-150°C
j
V
CC
Supply VCC current
VK ≥ VK
VTX = V
(1)
357V
≤ 5.5 V; VLI,VTX = 0 V -1.42.3mA
; VLI ≥ VLI
high
@ VCC ≤ 5.5 V
CC
high
-5<15µA
L9637Electrical specification
Table 5.Electrical characteristics (continued)
SymbolParameterTest conditionMin.Typ.Max.Unit
IS
IS
IS
VK
VK
V
RK
OFF
Khys
I
Koff
ON
SB
low
high
ON
V
Supply VS current
VK ≥ VK
VTX ≥ VTX
VCC ≤ 0.5 V @ VS ≤ 12 V -<1-µA
RX output status LOW
4.5 V ≤ VS ≤ 18 V
Input voltage low state
RX output status LOW
18 V < VS
RX output status HIGH
4.5 V ≤ VS ≤ 18 V
Input voltage high state
RX output status HIGH
18 V < VS
Input threshold hysteresis VK
@ VTX ≥ VTX
Input current
VK ≤ V
@ V
Output ON impedance
VTX ≤ VTX
IK ≥ 7 mA
≤ 16 V; VLI, VTX = 0 V -1.23mA
S
; VLI ≥ VLI
high
high
@ VS ≤ 12 V
high
-120220µA
-24-0.45V
S
-24-8V
- VK
high
low
; VS, VCC ≥ 0 or
S
V
S
≥ 6.5 V
S
low
(2)
0.55V
12-V
-
high
-5425µA
, VCC = open
-1030Ω
-VSV
S
0.025
V
S
S
0.8V
V
V
IK
VTX
VTX
RRX
RLO
IRX
ILO
VRX
VLO
RLO
RRX
SC
Short circuit current 3060100mA
Input voltage LOW state -24-1V
low
Input voltage HIGH state 2.5-V
high
ON
Output ON impedance
ON
SC
Output short circuit current 92035mA
SC
H
Output voltage HIGH state
H
VK ≤ VK
≥ 6.5 V I
V
S
10MΩ ≤ R
10MΩ ≤ R
; VLI ≤ VLI
low
RX, LO
LRX
LLO
Output status = (HIGH)
Output pull-up resistance
-0.15 V ≤ VLO ≤ V
-0.15 V ≤ VRX ≤ V
RTXInput pull up resistance -0.15 V ≤ VTX ≤ V
LO output status LOW
VLI
Input voltage LOW state
low
4.5 V ≤ VS ≤ 18 V
LO output status LOW 18 V < V
low
≥ 1 mA
+ 0.15 V
CC
+ 0.15 V
CC
+ 0.15 V 102040kΩ
CC
-
V
CC
0.25
-
4090
VCC-
0.1
51020kΩ
-24
-24
S
-0.45V
CC
V
Ω
VCC-V
V
S
8
Doc ID 1765 Rev 75/15
Electrical specificationL9637
Table 5.Electrical characteristics (continued)
SymbolParameterTest conditionMin.Typ.Max.Unit
LO output status HIGH
VL
high
Input voltage HIGH state
4.5 V ≤ VS ≤ 18 V
LO output status HIGH 18 V < V
VLI
ILIInput current
C
Ki,LO,RX
f
LI-LO
f
K-RX
f
TX-k
t
rLI-LO
t
rK-RX
t
rTX-K
t
fLI-LO
t
fK-RX
t
fTX-K
t
OFF,LI-LO
t
OFF,K-RX
t
OFF,TX-K
t
ON,LI-LO
t
ON,K-RX
t
ON,TX-K
1. Specs are tested at 5V only. Compliance on Vcc full range is guaranteed by design.
2. For output currents lower than this value a series protection diode can become active. See also Figure 8 and 9.
Input threshold hysteresis VLI
hys
high
VLI ≤ V
- VLI
low
, VCC ≥ 0 or
S VS
, VCC = open
V
S
Internal output capacities --20pF
9 V < VS < 16 V (external loads)
Transmission frequency
RKO = 510 Ω, CK ≤ 1.3 nF
in active mode see Figure 5
Rise time
for the definition of t
, tf see
r
Figure 3
9 V < V
Fall time -26µs
Switch OFF time
RKO = 510 Ω, CK ≤ 1.3 nF
for the definition of ton, t
< 16 V (external loads)
S
see
OFF
Figure 3.
9 V < V
< 16 V (external loads)
S
RKO = 510 Ω, CK ≤ 1.3 nF
Switch ON time -417µs
(inactive mode see Figure 5)
0.55V
12
S
-0.025V
-5425µA
--50kHz
-26µs
-417µs
-V
S
S
S
0.8V
V
6/15Doc ID 1765 Rev 7
L9637Electrical specification
Figure 3.Input to output timings and output pulse shape
V
I
t
V
OUT
80%80%
20%
t
OFF
20%
t
r
t
ON
t
f
t
Doc ID 1765 Rev 77/15
Electrical specificationL9637
Figure 4.ISO application circuit
510 Ohm
0.4 Ohm
VS
Diagnostic
Tester
VS
40V
R
KO
K
K
C
K
IK
OFF
-
+
RTX RLO RRX
-
+
1,75V
LI
L
ILI
-
+
VCC
TX
RX
LO
GND
5V
VCC
I/O
I/O
uP
I/O
VDD
ECU1
K Line
L Line
K
C
K
LI
ECU2
8/15Doc ID 1765 Rev 7
L9637Functional description
3 Functional description
The L9637 is a monolithic bus driver designed to provide bidirectional serial communication
in automotive diagnostic applications according to the specification "Diagnostic Systems
ISO9141".
The device provides a bidirectional link, called K, to the V
includes a separate comparator L which is also able to be linked to the V
TX and output RX of K are related to V
with her integrated pull up resistances. Also the L
CC
comparator output LO has a pull up resistance connected to V
The maximum external pull up resistance at K related to V
t related diagnosis bus. It also
Ba
.
CC
should not be higher than RKO ≤
S
t bus. The input
Ba
5 kΩ to achieve clear output ON conditions.
All V
bus defined inputs LI and K have supply voltage dependent thresholds together with
Bat
sufficient hysteresis to suppress line spikes. These pins are protected against overvoltages,
shorts to GND and V
and can also be driven beyond VS and GND.
S
These features are also given for TX, RX and LI only taking into account the behavior 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 temperature must decrease below the K switch ON temp. To achieve no fault for
V
undervoltage conditions the outputs will be switched OFF and stay at high impedance.
S
The device is also protected against reverse battery condition. During lack of V
pins shows high impedance characteristic. To realize a lack of the V
related bus line LI and
S
or GND all
S
K the outputs LO and RX shows defined ON status.
Suppressing all 4 classes of "Schaffner" signals all pins can be load with short energy
pulses of max. ±0.2 mJ. All these features together with a high possible baud rate
>50Kbaud, controlled output slopes for low EMI, a wide power supply voltage range and a
very small quiescent current during OFF (TX LI K=High) condition IS
real standby function with zero power consumption IS
powering V
≤ 0.5 V make this device high efficient for automotive bus system.
CC
≤ 1 µA during system de
SB typ
≤ 120 µA, and a
off typ
After wake up of the system from OFF or SB condition the first output signal will have an
additional delay time td
≤ 5 µs see also Figure 5.
typ
The typical output voltage behavior for the K, LO, RX outputs as a function of the output
current is shown in Figure 6. Figure 7 shows a waveform of the output signal when the low
level changes from R
ON
* I
OUT
to I
* 2 * RON + UBE state. This variation occurs due to too
OUT
low output current or after a negative transient forced to the output or to the supply voltage
line.
Doc ID 1765 Rev 79/15
Functional descriptionL9637
Figure 5.Typical timing for mode transitions
OFFactiveactiveOFF
LI
LO
TX
RX
K
tdt
ON
LI - LO
tdt
ON
TX - K
10/15Doc ID 1765 Rev 7
L9637Functional description
Figure 6.Output characteristics at K, LO, RX
I
OUT
I
OUT
MIN
I
V
=
N
O
S
D
R
OUT
R
OUTDSON
*
protection diode
V
I
=
OUT
OUTDSON
0.8V
Figure 7.Output signal shape related to output current
V
IN
V
OUT
I
2
**
OUTDSON
+ U
R
I
R
OUTDSON
*
BE
I
I
OUT
>
I
OUT
MIN
I
OUT
I
<
OUT
MIN
OUT
2
**
>
I
OUT
+ U
R
MIN
BE
V
OUT
t
t
Doc ID 1765 Rev 711/15
Functional descriptionL9637
Figure 8.EMS performance (ISO 9141 bus system)
VS = 12V
=
510 Ohm
50 Ohm
10kHz
D
Signal comparison
10%
D£
Δ≤±
10%
VS
TXK
IS O in terfa ce
VS
RX
IS O in terfa ce
136 Ohm
1.5nF
K
Figure 9.Input power vs. frequency diagram
P
i (m W)
10000
5000
not incident power resistant
68 Ohm
Probe
NAP - 73
P
i
NAP
40dB
P
ima x
= 5W
Rhode
&
SMG
0.1 - 1000MHz
Schw artz
1000
incident power resistant
100
1101001000
12/15Doc ID 1765 Rev 7
f
(M Hz)
L9637Package information
4 Package information
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK
®
packages, depending on their level of environmental compliance. ECOPACK
®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK
®
is an ST trademark.
Figure 10. SO8 mechanical data and package dimensions
DIM.
A1.7500.0689
A10.1000.250 0.00390.0098
A21.2500.0492
b0.2800.480 0.01100.0189
c0.1700.230 0.00670.0091
(1)
D
E5.800 6.000 6.200 0.2283 0.2362 0.2441
(2)
E1
e1.2700.0500
h0.2500.500 0.00980.0197
L0.4001.270 0.01570.0500
L11.0400.0409
k0˚8˚0˚8˚
ccc0.1000.0039
Notes: 1. Dimensions D does not include mold flash,
2. Dimension “E1” does not include interlead flash
mminch
MIN. TYP. MAX. MIN. TYP. MAX.
4.800 4.900 5.000 0.1890 0.1929 0.1969
3.800 3.900 4.000 0.1496 0.1535 0.1575
protrusions or gate burrs.
Mold flash, po trusions or gate burrs shall not
exceed 0.15m m in total (bot h side).
or protrusions. Interlead flash or protrusions shall
not exceed 0.25 mm per side.
OUTLINE AND
MECHANICAL DATA
SO-8
0016023 D
Doc ID 1765 Rev 713/15
Revision historyL9637
5 Revision history
Table 6.Document revision history
DateRevisionChanges
24-Jan-20025Initial release.
Document reformatted.
07-Nov-20086
15-Jun-20097
Added Table 1: Device summary on page 1.
Updated Section 4: Package information on page 13.
Updated the values of “stabilized voltage” and “transmission
frequency” parameters on Table 5: Electrical characteristics.
14/15Doc ID 1765 Rev 7
L9637
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