L9637(1998) 查看數據表（PDF） - STMicroelectronics

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L9637
(Rev.:1998)

ISO 9141 INTERFACE

STMicroelectronics 

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 ISoff typ ≤ 120µA,

and a real standby function with zero power con-

sumption ISSB typ ≤ 1µA during system depower-

ing VCC ≤ 0.5V make this device high efficient for

automotive bus system.

After wake up of the system from OFF or SB

condition the first output signal will have an addi-

tional delay time tdtyp ≤ 5µs see also Fig. 3.

The typical output voltage behaviour for the K,

LO, RX outputs as a function of the output current

is shown in Fig.4. Fig.5 shows a waveform of the

output signal when the low level changes from

RON * IOUT to IOUT * 2 * RON + UBE state. This vari-

ation occurs due to too low output current or after

a negative transient forced to the output or to the

supply voltage line.

Figure 3: Typical timing for mode transitions.

O FF

ac tiv e

O FF

LI

a c tiv e

LO

TX

K

RX

6/11

t d t ON L I - L O

td tON T X - K

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