Datasheet L9637D, L9637 Datasheet (SGS Thomson Microelectronics)



OPERATING POWER SUPPLY VOLTAGE
RANGE 4.5V ≤ V

≤ 36V (40V FOR TRAN-

S

SIENTS)
REVERSE SUPPLY (BATTERY) PRO-

TECTED DOWNTOV

≥ -24V

S

STANDBY MODE WITH VERY LOW CUR­RENT CONSUMPTIONIS

1µA@VCC0.5V

SB

LOW QUIESCENT CURRENT IN OFF CON­DITIONIS

OFF

= 120µA
TTL COMPATIBLETX INPUT
BIDIRECTIONAL K-I/O PIN WITH SUPPLY

VOLTAGEDEPENDENT INPUTTHRESHOLD
OVERTEMPERATURE SHUT DOWN FUNC-

TION SELECTIVETO K-I/OPIN
WIDE INPUT AND OUTPUT VOLTAGE

RANGE-24V≤V

V

≤

K

S

K OUTPUT CURRENT LIMITATION, TYP IK=
60mA

DEFINEDOFF OUTPUT STATUS IN UNDER­VOLTAGE CONDITION AND VS OR GND IN­TERRUPTION

CONTROLLED OUTPUT SLOPE FOR LOW
EMI

HIGH INPUT IMPEDANCE FOR OPEN V

OR

S

GND CONNECTION

L9637

ISO 9141 INTERFACE

SO8 Minidip

ORDERING NUMBERS:

L9637D L9637

DEFINED OUTPUT ON STATUS OF LO OR
RXFOROPENLIOR 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.

BLOCK DIAGRAM

December 1998

VS

RTX RLO RRX

K

IK

OFF

­+

LI

ILI

­+

-

+

1,75V

VCC

TX

RX

LO

GND

1/11

L9637

ABSOLUTE MAXIMUM RATINGS (Nodamage or latch)

Symbol Parameter Value Unit

V

S

Supply Voltage
ISO transients t = 400ms

V

CC

/dt Supply Voltage transient -10 to +10 V/µs

∆V

S

V

LI, K

V

LO, RX, TX

Note: Max. ESD voltages are ±2kV withhuman body model C= 100pF,R = 1.5k corresponds to maximumenergy dissipation0.2mJaccording
to MIL883C.

Stabilized Voltage -0.3 to +7 V

Pin Voltage -24 to V
Pin Voltage -24 to V

PIN CONNECTION(Top view)

RX

LO

1

2

8

LI

7

VS

-24 to +36

-24 to +40

CC

V
V

S

V
V

U537

VCC

TX

3

45

6

K

GND

THERMAL DATA

Symbol Parameter Min. Typ. Max. Unit

T

JSDon

T

JSDoff

R

th j-amb

Temperature K shutdown switch on threshold
Temperature K shutdown switch off threshold

Thermal steady state junction to ambient resistance for SO8
Thermal steady state junction to ambient resistance for Minidip

160
150

130

80

155
100

200
200

180
120

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

°C

C

°

C/W

°
°C/W

2/11

L9637

ELECTRICALCHARACTERISTICS (The electrical characteristicsare valid within the below defined op-

erating conditions, unless otherwise specified. The function is guaranteed by design until T
peratureshutdown switch-on-threshold.)

Symbol Parameter Test Condition Min. Typ. Max. Unit

V

S

V

CC

T

j

I

CC

IS

ON

IS

OFF

IS

SB

VK

low

VK

high

VK

hys

IK

off

RK

ON

IK

SC

VTX

VTX

RRX
RLO

IRX
ILO

VRX

VLO

RLO
RRX

RTX Input pull up resistance -0.15V≤VTX≤V

VLI

low

VL

high

VLI

hys

Supply Voltage 4.5 36 V
Stabilized Voltage 3 7 V
Junction temperature -40 150 °C
Supply VCCCurrent V

5.5V; VLI,VTX = 0V 1.4 2.3 mA

≤

CC

VK≥VK

; VLI≥VLI

high

high

-5 <1 5

VTX = VCC@VCC≤ 5.5V

Supply VS Current VS≤ 16V; VLI, VTX = 0V 1.2 3 mA

VK ≥ VK
VTX≥VTX

V

CC

Input Voltage Low state RX output status LOW

4.5V ≤ V
RX output status LOW

18V < V

Input Voltage High state RXoutput status HIGH

4.5V≤V
RX output status HIGH

18V < V

Input Threshold Hysteresis VK

high

Input Current @ VTX≥VTX

high

0.5V @ V

≤

S

S

S

S

-VK

; VLI ≥ VLI

high@VS

S

≤ 18V

18V

≤

low

high

high

12V

≤

12V <1

≤

-24 0.45V

-24 8 V

0.55V

S

12 V

-5 4 25

120 220 µA

0.025
V

S

VK ≤ VSVS,VCC≥ 0or

V

Output ON Impedance @ VS≥ 6.5V

VTX≤ VTX

S,VCC

low

= open

10 30 Ω

IK≥ 7mA 1)
Short Circuit Current 30 60 100 mA
Input voltage LOW state -24 1 V

low

Input voltage HIGH state 2.5 V

high

Output ON Impedance VK ≤ VK

ON
ON

Output Short Circuit Current 9 20 35 mA

SC
SC

Output Voltage HIGH state 10MΩ ≤ R

H

H

V

S

10MΩ ≤ R

6.5V I

≥

;VLI≤VLI

low

RX, LO

LRX
LLO

low

1mA 1) 40 90

≥

VCC-

0.25

VCC-

0.1

Output pull-up resistance Output status = (HIGH)

-0.15V ≤ VLO ≤ V

-0.15V ≤ VRX ≤ V

Input voltage LOW state LO output status LOW

4.5V ≤ V

≤ 18V

S

LO output status LOW 18V < V
Input voltage HIGH state LO output status HIGH

4.5V ≤ V

≤ 18V

S

LO outputstatusHIGH 18V < V
Input threshold hysteresis VLI

high

- VLI

low

+ 0.15V

CC

+ 0.15V

CC

+ 0.15V 10 20 40 K

CC

51020KΩ

-24 0.45V

-24 8 V

S

0.55V

S

12 VS V

S

0.025VS0.8 V

V

S

S

0.8 V

CC

V

CC

VS V

JSDon

S

S

tem-

A

µ

A

µ

V

V

V

A

µ

V

Ω

V

Ω

V

ILI Input current VLI ≤ V

SVS,VCC

V

S,VCC

≥ 0or

= open

-5 4 25 µA

3/11

L9637

ELECTRICALCHARACTERISTIC (continued)

Symbol Parameter Test Condition Min. Typ. Max. Unit

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) For outputcurrents lower than this value a series protection diode can become active. See also Fig. 4 and 5.

Internal output capacities 20 pF
Transmission Frequency 9V < VS< 16V

(external loads)

R

= 510Ω,CK≤1.3nF

KO

50 100 kHz

in active mode see Fig. 3
Rise Time for the definition of tr, tfsee

Fig.1.

Fall Time

9V < V

R

< 16V (external loads)

S

= 510Ω,CK≤1.3nF

KO

Switch OFF time for the definition of ton, t

Fig.1.

Switch ON time

9V < V

R

< 16V (external loads)

S

= 510Ω,CK≤1.3nF

KO

(inactive mode see Fig. 3)

OFF

see

26µs

26µs

417

417µs

s

µ

Figure 1:

Input to OutputTimings and Output Pulse Shape.

V

I

V

OUT

80% 80%

20%

t

20%

4/11

t

OFF

t

r

t

f

t

ON

t

Figure 2: ISOApplication Circuit

L9637

510 Ohm

0.4 Ohm

VS

Diagnostic
Tester

VS

40V

R

KO

K

K Line

C

K

LI

L Line

ECU1

K

C

K

IK

OFF

-

+

-

ILI

+

K

L

RTX RLO RRX

-

+

1,75V

VCC

TX

RX

LO

GND

I/O

I/O

I/O

5V

VCC

uP

VDD

LI

ECU2

FUNCTIONAL DESCRIPTION

The L9637 is a monolithic bus driver designed to
provide bidirectional serial communicationin auto­motive diagnostic applications according to the
specification”DiagnosticSystems ISO9141”.

The device provides a bidirectionallink, called K,
to the V

related diagnosis bus. It also includes

Bat

a separatecomparator L which is also able to be
linked to the V
RX of K are related to V

bus. The input TX and output

Bat

with her integrated pull

CC

up resistances. Also the L comparator output LO
has a pullup resistance connectedto V

CC

.

The maximum external pull up resistance at K re­lated to V

should not be higher than RKO≤ 5KΩ

S

to achieve clear outputON conditions.
All V

bus defined inputs LI and K have supply

Bat

voltage dependent thresholds together with suf-

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

and can also be driven beyond V

S

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 temperatureincreases 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 forV

under-

S

voltage conditions the outputs will be switched
OFF and stay at high impedance. The device is
also protected against reverse battery condition.
During lack of V

or GND all pins shows high im-

S

pedance characteristic.To realize a lackof theV
related bus line LI and K the outputs LO and RX
showsdefined ON status.

S

S

5/11

L9637

Supressing all 4 classes of ”Schaffner”signals all
pins can be load with short energy pulses of max.
±0.2mJ. 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

off typ

≤ 120µA,
and a real standby function with zero power con­sumption IS
ing V

≤ 0.5V make this device high efficient for

CC

≤ 1µA during system depower-

SB typ

automotivebus system.

Figure 3: Typicaltimingfor modetransitions.

OFF active activeOFF

LI

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

≤ 5µs see also Fig. 3.

typ

The typical output voltage behaviour for the K,
LO, RX outputs as a functionof the output current
is shown in Fig.4. Fig.5 shows a waveform of the
output signal when the low level changes from
R

ON*IOUT

to I

*2*RON+UBEstate.Thisvari-

OUT

ation occurs due to too low output current or after
a negative transient forced to the output or to the
supplyvoltage line.

LO

TX

K

RX

6/11

tdt

ON

LI - LO

tdt

ON

TX - K

Figure 4: OutputCharacteristicsat K, LO, RX.

I

OUT

I

OUT

MIN

L9637

N
O

S

D

R

protection diode

Figure 5: OutputSignal Shape Related to OutputCurrent.

V

OUT

V

OUT

I

=

OUT DSON

I

=

OUT DSON

R

*

2

**

R

0.8V

+U

BE

V

OUT

I

OUT DS ON

R

2

**

I

OUT DSON

V

IN

t

V

OUT

+U

BE

R

*

t

I

OUT

I

I

>

OUT

OUT

>

I

OUT

MIN

I

OUT

I

<

OUT

MIN

MIN

7/11

L9637

Figure 6: EMSPerformance(ISO 9141 BUS system).

VS = 12V

=

510 Ohm

10kHz

D

Signal comparison

∆≤± 10%

D£ 10 %

Figure 7.

P

i(mW )

10000

50 Ohm

VS

TX K

IS O i n te rface

VS

RX

IS O i n te rface

1.5nF

K

not incident power resistant

136 Ohm

68 Ohm

Probe

NAP - 73

P

i

NAP

P

ima x

40dB

=5W

Rhode

& Schwartz

SMG

0.1 - 1000MH z

8/11

5000

1000

incident power resistant

100

1 10 100 1000

f

(M H z)

L9637

DIM.

MIN. TYP. MAX. MIN. TYP. MAX.

A 1.75 0.069
a1 0.1 0.25 0.004 0.010
a2 1.65
a3 0.65 0.85 0.026 0.033

b 0.35 0.48 0.014 0.019

b1 0.19 0.25 0.007 0.010

C 0.25 0.5 0.010 0.020

c1 45° (typ.)

D (1) 4.8 5.0 0.189 0.197

E 5.8 6.2 0.228 0.244

e 1.27 0.050

e3 3.81 0.150

F (1) 3.8 4.0 0.15 0.157

L 0.4 1.27 0.016 0.050

M 0.6 0.024

S8°(max.)

mm inch

0.065

OUTLINE AND

MECHANICAL DATA

SO8

(1) D and F do not include moldflash or protrusions. Moldflash or

potrusions shallnot exceed 0.15mm (.006inch).

9/11

L9637

DIM.

MIN. TYP. MAX. MIN. TYP. MAX.

A 3.32 0.131
a1 0.51 0.020

B 1.15 1.65 0.045 0.065

b 0.356 0.55 0.014 0.022
b1 0.204 0.304 0.008 0.012

D 10.92 0.430

E 7.95 9.75 0.313 0.384

e 2.54 0.100
e3 7.62 0.300
e4 7.62 0.300

F 6.6 0.260

I 5.08 0.200
L 3.18 3.81 0.125 0.150
Z 1.52 0.060

mm inch

OUTLINE AND

MECHANICAL DATA

Minidip

10/11

L9637

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are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.

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