Page 1
Monolithic bus driver with ISO 9141 interface
SO8
Features
■ Operating power supply voltage range
4.5 V V
■ Reverse supply (battery) protected down to
V
-24 V
S
■ Standby mode with very low current
consumption IS
■ Low quiescent current in off condition
IS
OFF
■ TTL compatible TX input
■ Bidirectional K-I/O pin with supply voltage
dependent input threshold
■ Overtemperature shut down function Selective
to K-I/O pin
■ Wide input and output voltage range
-24 V V
■
K output current limitation, typ. IK = 60 mA
■ Defined OFF output status in undervoltage
condition and V
■ Controlled output slope for low EMI
Table 1. Device summary
36 V (40 V for transients)
S
1 mA @ VCC 0.5 V
SB
= 120 µA
V
K
S
or GND interruption
S
L9637
■ High input impedance for open V
connection
■ Defined output ON status of LO or RX for open
LI or K inputs
■ Defined K output OFF for TX input open
■ Integrated pull up resistors for TX, RX and LO
■ EMI robustness optimized
Description
The L9637 is a monolithic integrated circuit
containing standard ISO 9141 compatible
interface functions.
or GND
S
Order code Package Packing
L9637D SO8 Tube
L9637D013TR SO8 Tape and reel
E-L9637D
E-L9637D013TR
1. Device in ECOPACK® package (see Section 4: Package information on page 13).
September 2013 Doc ID 1765 Rev 8 1/15
(1)
(1)
SO8 Tube
SO8 Tape and reel
www.st.com
15
Page 2
Contents L9637
Contents
1 Block diagram and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Electrical specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2/15 Doc ID 1765 Rev 8
Page 3
L9637 Block diagram and pin description
TX
RX
LO
GND
LI
+
VS
VCC
K
1,75V
+
RTX RLO RRX
ILI
IK
OFF
-
+
RX
LO
VCC
TX GND
K
VS
LI1
3
2
4
6
5
7
8
1 Block diagram and pin description
1.1 Block diagram
Figure 1. Block diagram
1.2 Pin description
Figure 2. Pin connection (top view)
Table 2. Pin description
N. Name Function
1 RX Output for K as input
2 LO Output L comparator
3 VCC Stabilized voltage supply
4 TX Input for K as output
5 GND Common GND
6 K Bidirectional I/O
7 VS Supply voltage
8 LI Input L comparator
Doc ID 1765 Rev 8 3/15
Page 4
Electrical specification L9637
2 Electrical specification
2.1 Absolute maximum ratings
Table 3. Absolute maximum ratings (No damage or latch)
Symbol Parameter Value Unit
V
S
V
CC
V
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
Symbol Parameter Test condition Min. Typ. Max. Unit
V
V
CC
T
I
CC
4/15 Doc ID 1765 Rev 8
Supply voltage - 4.5 - 36 V
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 - 1.4 2.3 mA
; VLI VLI
high
@ VCC 5.5 V
CC
high
-5 <1 5 µA
Page 5
L9637 Electrical specification
Table 5. Electrical characteristics (continued)
Symbol Parameter Test condition Min. 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 - 1.2 3 mA
S
; VLI VLI
high
high
@ VS 12 V
high
- 120 220 µA
-24 - 0.45V
S
-24 - 8 V
- VK
high
low
; VS, VCC 0 or
S
V
S
6.5 V
S
low
(2)
0.55V
12 - V
-
high
-5 4 25 µA
, VCC = open
-1030
-VSV
S
0.025
V
S
S
0.8 V
V
V
IK
VTX
VTX
RRX
RLO
IRX
ILO
VRX
VLO
RLO
RRX
SC
Short circuit current 30 60 100 mA
Input voltage LOW state -24 - 1 V
low
Input voltage HIGH state 2.5 - V
high
ON
Output ON impedance
ON
SC
Output short circuit current 9 20 35 mA
SC
H
Output voltage HIGH state
H
VK VK
6.5 V I
V
S
10M R
10M 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
RTX Input 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 10 20 40 k
CC
-
V
CC
0.25
-
40 90
VCC-
0.1
51020k
-24
-24
S
- 0.45V
CC
V
VCC-V
V
S
8
Doc ID 1765 Rev 8 5/15
Page 6
Electrical specification L9637
Table 5. Electrical characteristics (continued)
Symbol Parameter Test condition Min. 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
ILI Input 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 - - 20 pF
9 V < VS < 16 V (external loads)
Transmission frequency
RKO = 510 , 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 - 2 6 µs
Switch OFF time
RKO = 510 , 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 , CK 1.3 nF
Switch ON time - 4 17 µs
(inactive mode see Figure 5)
0.55V
12
S
- 0.025V
-5 4 25 µA
- - 50 kHz
-26µs
- 4 17 µs
-V
S
S
S
0.8 V
V
6/15 Doc ID 1765 Rev 8
Page 7
L9637 Electrical specification
t
V
t
f
t
I
V
20%
t
r
80% 80%
20%
OUT
t
OFF
t
ON
Figure 3. Input to output timings and output pulse shape
Doc ID 1765 Rev 8 7/15
Page 8
Electrical specification L9637
40V
uP
I/O
I/O
I/O
5V
VCC
VDD
ECU1
K Line
L Line
ECU2
K
L
LI
K
VS
TX
RX
LO
GND
LI
VS
VCC
K
1,75V
RTX RLO RRX
510 Ohm
Diagnostic
Tester
ILI
C
K
0.4 Ohm
-
+
-
+
IK
OFF
R
KO
C
K
-
+
Figure 4. ISO application circuit
8/15 Doc ID 1765 Rev 8
Page 9
L9637 Functional 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 kto 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 8 9/15
Page 10
Functional description L9637
LI
LO
TX
K
RX
tdt
ON
LI - LO
tdt
ON
TX - K
OFF active activeOFF
Figure 5. Typical timing for mode transitions
10/15 Doc ID 1765 Rev 8
Page 11
L9637 Functional description
I
MIN
OUT
D
S
O
N
R
V
OUT
0.8V
protection diode
I
OUT
I
OUT DSON
R
*
V
OUT
=
+ U
BE
I
OUT DSON
R
2
**
V
OUT
=
t
+ U
BE
I
OUT DSON
R
2
**
I
OUT DSON
R
*
t
I
MIN
OUT
I
OUT
>
I
MIN
OUT
I
OUT
>
I
MIN
OUT
I
OUT
<
IN
V
OUT
V
Figure 6. Output characteristics at K, LO, RX
Figure 7. Output signal shape related to output current
Doc ID 1765 Rev 8 11/15
Page 12
Functional description L9637
VS = 12V
50 Ohm
10kHz
510 Ohm
136 Ohm
68 Ohm
1.5nF
=
40dB
P
ima x
= 5W
Rhode
&
Schw artz
SMG
0.1 - 1000MHz
NAP
Probe
NAP - 73
RX
VS
K
IS O in terfa ce
VS
TX K
IS O in terfa ce
D£
10%
Signal comparison
D
P
i
Δ≤±
10%
10000
5000
1000
100
1 10 100 1000
f
(M Hz)
not incident power resistant
incident power resistant
P
i (m W)
Figure 8. EMS performance (ISO 9141 bus system)
Figure 9. Input power vs. frequency diagram
12/15 Doc ID 1765 Rev 8
Page 13
L9637 Package information
OUTLINE AND
MECHANICAL DATA
DIM.
mm inch
MIN. TYP. MAX. MIN. TYP. MAX.
A 1.750 0.0689
A1 0.100 0.250 0.0039 0.0098
A2 1.250 0.0492
b 0.280 0.480 0.0110 0.0189
c 0.170 0.230 0.0067 0.0091
D
(1)
4.800 4.900 5.000 0.1890 0.1929 0.1969
E 5.800 6.000 6.200 0.2283 0.2362 0.2441
E1
(2)
3.800 3.900 4.000 0.1496 0.1535 0.1575
e 1.270 0.0500
h 0.250 0.500 0.0098 0.0197
L 0.400 1.270 0.0157 0.0500
L1 1.040 0.0409
k0˚8˚0˚8˚
ccc 0.100 0.0039
Notes: 1. Dimensions D does not include mold flash,
protrusions or gate burrs.
Mold flash, po trusions or gate burrs shall not
exceed 0.15m m in total (bot h side).
2. Dimension “E1” does not include interlead flash
or protrusions. Interlead flash or protrusions shall
not exceed 0.25 mm per side.
SO-8
0016023 D
4 Package information
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK
Figure 10. SO8 mechanical data and package dimensions
®
packages, depending on their level of environmental compliance. ECOPACK
®
is an ST trademark.
®
Doc ID 1765 Rev 8 13/15
Page 14
Revision history L9637
5 Revision history
Table 6. Document revision history
Date Revision Changes
24-Jan-2002 5 Initial release.
Document reformatted.
07-Nov-2008 6
15-Jun-2009 7
20-Sep-2013 8 Updated disclaimer.
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.
14/15 Doc ID 1765 Rev 8
Page 15
L9637
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Doc ID 1765 Rev 8 15/15
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