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Class B Serial Link Transceiver
The MC33390 is a serial link bus transceiver designed to provide bi-directional half-duplex communication meeting the automotive SAE Standard J-1850 Class B Data Communication Network Interface specification. It is designed to interface directly to on-board vehicle microcontrollers and serves to transmit and receive data on a single wire bus at data rates of 10.4 kb/s using Variable Pulse Width Modulation (VPWM). The MC33390 operates directly from a vehicle's 12 V battery system and functions in a true logic fashion as an I/O interface between the microcontroller's 5.0 V CMOS logic level swings and the required 0 to 7.0 V waveshaped signal swings of the bus. The bus output driver is short circuit current limited. A tristateable 4X/Loop mode select pin is used to invoke Normal Wave Shaped J-1850 Class B operation (0 V), Disabled Waveshaping high speed operation (5.0 V), or Looped Back transmitted signal (Tx) to the Rx output after having been wave shaped but not transmitted onto the bus operation (high impedance). The Loop Back mode is used to confirm operational integrity independent of the bus. The MC33390 derives it's robustness to temperature and voltage extremes from being built on a SMARTMOSTM process, incorporating CMOS logic, bipolar/MOS analog circuitry, and DMOS power FETs. Though the MC33390 was principally designed for automotive applications requiring SAE J-1850 Class B standards, it is suited for other serial communication applications. It is parametrically specified over an ambient temperature range of - 40C TA 125C and 7.0 V VBat 16 V supply. The economical 8-pin SO-8 surface mount plastic package makes the device a cost effective solution. * Designed for SAE J-1850 Class B Data Rates
MC33390
J-1850 SERIAL LINK TRANSCEIVER
SEMICONDUCTOR TECHNICAL DATA
8 1
D SUFFIX PLASTIC PACKAGE CASE 751 (SO-8)
* * * * * *
Full Operational Bus Dynamics Over a Supply Voltage of 9.0 to 16 V Ambient Operating Temperature of -40 to 125C Interfaces Directly to Standard 5.0 V CMOS Microcontroller Bus Pin Protected Against Shorts to Battery and Ground Thermal Shutdown with Hysteresis Controlled Voltage and Current Waveshaping of Bus Drive
PIN CONNECTIONS
Sleep Gnd Load Bus 1 2 3 4 (Top View) 8 Rx (DO) 7 Tx (DI) 6 4X/Loop 5 VBat
SMARTMOS is a trademark of Motorola, Inc.
Simplified Block Diagram
Bus Driver Thermal Shutdown Waveshaping Filter Digital Output Driver 4X Enable Loopback Loss of Gnd Protection Bus
ORDERING INFORMATION
Device MC33390D Operating Temperature Range TA = -40 to 125C Package SO-8
VBat Sleep 5.0 V Ref Tx Rx 4X/Loop
Voltage Regulator
Load Gnd
(c) Motorola, Inc. 1999
Rev 3
MOTOROLA ANALOG IC DEVICE DATA
1
MC33390
+VBat
Figure 1. Simplified Typical Application
Primary Node
VBat Sleep
MC33390 Voltage Regulator 4.5 V Ref
Bus Driver Thermal Shutdown
Bus
MCU
Tx Rx 4X/Loop Digital Output Driver
Waveshaping Filter Loss of Gnd Protection Load Gnd
Secondary Nodes
4X Enable Loopback
This device contains approximately 400 active transistors and 250 gates.
TERMINAL CONNECTIONS
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1 2 3 4 5 6 7 8 Sleep Gnd Enables the Transceiver when Logic `1' and Disables the Transceiver when Logic `0' Device Ground Terminal Load Bus Accommodates an External Pull-Down Resistor to Ground to Provide Loss of Ground Protection Wave-Shaped SAE Standard J-1850 Class B Transmitter Output and Receiver Input Provides Device Operating Input Power VBat 4X/Loop Tx Tristate Input Mode Control; Logic `0' = Normal Waveshaping, Logic `1' = Waveshaping Disabled for 4X Transmitting, High Impedance = Loopback Mode Serial Data Input (DI) from the Microcontroller to be Transmitted onto Bus Bus Received Serial Data Output (DO) Sent to the Microcontroller Rx
Terminal Number
Terminal Name
Function
MAXIMUM RATINGS (All voltages are with respect to ground unless otherwise noted)
Rating Symbol VBat Value
Unit V V V V
VBat DC Supply Voltage (Note 1) Input I/O Terminals (Note 2) Bus and Load Outputs ESD Voltage Human Body Model Machine Model
-0.6 to 34
VI/O(CPU) VBus
-0.3 to 7.0 -2.0 to 16 2000 200
VESD1 VESD2 Tstg TA TJ
Storage Temperature
-65 to 150 -40 to 125 -40 to 150 260 180
C C C C
Operating Ambient Temperature
Operating Junction Temperature
Lead Soldering Temperature (Note 4)
Tsolder RJA
Thermal Resistance (Junction-to-Ambient)
C/W
NOTES: 1. An external series diode must be used to provide reverse battery protection of the device. 2. Sleep, Tx, Rx, and 4X/Loop are normally connected to a microcontroller. 3. ESD data available upon request. 4. Lead soldering temperature limit is for 10 seconds maximum duration; contact Motorola Sales Office for device immersion soldering time/temperature limits.
2
MOTOROLA ANALOG IC DEVICE DATA
MC33390
ELECTRICAL CHARACTERISTICS (Characteristics noted under conditions of 7.0 V VBat 16 V, -40C TA 125C,
Sleep = 5.0 V, unless otherwise noted). Typical values reflect the parameter's approximate mid-point average value with VBat = 13 V, TA = 25C. Characteristic DC CHARACTERISTICS Symbol Min Typ Max Unit
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Operational Battery Current (Tx = 7.8 kHz square wave) Bus Loading = 1380 W to Gnd, 3.6 nF to Gnd., Bus High Bus Loading = 257 W to Gnd, 20.2 nF to Gnd., Bus High Battery Bus Low Current After Sleep Toggle Low to High; Prior to Tx Toggling After Tx Toggle High to Low Sleep State Battery Current (V Sleep = 0 Vs) mA IBat(Op1) IBat(Op2) - - - - - 3.0 22.4 1.1 6.4 11.5 32 3.0 8.5 65 mA IBat(Bus L1) IBat(Bus L2) IBat(Sleep) 38.2 3.9 3.7 3.0 0.2
mA
V
Bus Input Receiver Threshold (Note 1) Threshold High (Bus Increasing until Rx 3.0 V) Threshold Low (Bus Decreasing until Rx 3.0 V) Threshold in Sleep State (Sleep = 0 V) Hysteresis (VBus(IH) - VBus(IL), Sleep = 0 V)
Bus Out Voltage (Tx = 5.0 V, 257 W RBus(L) to Gnd 1380 W) 8.2 V VBat 16 V 4.25 V VBat 8.2 V Tx = 0 V Bus Short Circuit Current (Tx = 5.0 V, -2.0 V VBus 4.8 V) Bus Leakage Current -2.0 V VBus 0 V 0 V VBus VBat
VBus(IH) VBus(IL) BusTH(Sleep) VBus(Hyst) VBus(Out1) VBus(Out2) VBus(Out3) IBus(Short)
4.25 - 2.4 0.1
- 3.5 3.4 0.6
V
6.25 VBat - 1.6 - 60
6.9 - 0.27 129 -55 189 170 12
8.0 VBat 0.7 170 - 500 190 15
mA
mA
C C
IBus(Leak1) IBus(Leak2) TBus(Lim)
-500 - 150 10
Bus Thermal Shutdown (Note 2) (Tx = 5.0 V, IBus = -0.1 mA) Increase Temp until VBus 2.5 V Bus and Load Current with loss of VBat or Gnd. (IBat = 0 mA) (See Figure 7) -18 V VBus 9.0 V -18 V VLoad 9.0 V Load Output (IL = 6.0 mA)
Bus Thermal Shutdown Hysteresis (Note 3) (TBus(Lim) - TBus(ReEn))
TBus(LimHys)
mA
IBus(Loss) ILoad(Loss) LOn
- - -
0.00 0.00 0.07 0.56 2.27 2.27 106 0.23 -60 110
0.1 0.1 0.2 0.9 0.8 -
V V V
Unpowered Load Output (VBat = 0 V, IL = 6.0 mA) Tx Input Voltage VBus 3.875 V VBus 3.875 V Tx Input Current VTx = 5.0 V VTx = 0 V
LDio
0.3 - 3.5
VTx(IL) VTx(IH) ITx(IH) ITx(IL)
mA mA
V
50 -2.0
200 2.0 200 200 1.5 3.6 0.4
4X/Loop Input Current V4X/Loop = 0 V (Normal Mode) V4X/Loop = 5.0 V (4X Mode)
I4X/Loop(IL) I4X/Loop(IH)
-200 -200 1.1 3.2
4X/Loop Input Threshold (Tx = 4096 Hz square wave) Normal Mode to Loopback Mode Loopback Mode to 4X Mode Rx Output Voltage Low (VBus = 0 V, IRx = 1.6 mA)
V4X/Loop(IL) V4X/Loop(IH) VRx(Low)
1.31 3.43 0.18 4.58 3.67 4.69
0.01 4.25 2.0
V V
Rx Output Voltage High (VBus = 7.0 V, IRx = -200 mA)
VRx(High) IRx
4.75 8.0
Rx Output Current (VRx = High; Short circuit protection limits) Rx Sleep State Output Voltage (Sleep = 0 V, (0 VBus 7.0 V) Sleep Input Current VSleep = 0 V VSleep = 5.0 V
mA V
VRx
4.25 - 1.0
4.85 -2.0 20
mA
ISleep(IL) ISleep(IH)
-0.23 6.21
NOTES 1. Typical threshold value is the approximate actual occurring switch point value with VBat = 13 V, TA = 25C. 2. Device characterized but not production tested for Thermal Shutdown. 3. Device characterized but not production tested for Thermal Shutdown Hysteresis.
MOTOROLA ANALOG IC DEVICE DATA
3
MC33390
ELECTRICAL CHARACTERISTICS (Characteristics noted under conditions of 7.0 V VBat 16 V, -40C TC 125C,
Sleep = 5.0 V, unless otherwise noted). Typical values reflect the parameter's approximate mid-point average value with VBat = 13 V, TA = 25C. Characteristic AC PERFORMANCE Bus Voltage Rise Time (9.0 V VBat 16 V, Tx = 7,812 Hz Sq Wave) (See Figure 2) (Bus Load = 3,300 pF and 1.38 kW to ground) (Bus Load = 16,500 pF and 300 W to ground) Bus Voltage Fall Time (9.0 V VBat 16 V, Tx = 7,812 Hz Sq Wave) (See Figure 2) (Bus Load = 3,300 pF and 1.38 kW to ground) (Bus Load = 16,500 pF and 300 W to ground) Pulse Width Distortion Time (9.0 V VBat 16 V, Tx = 7,812 Hz Sq Wave, Bus Load = 3,300 pF and 1.38 kW to ground) (See Figure 3) Bus Current Rise and Fall Time (9.0 V VBat 16 V, Bus Load = 16,500 pF and 300 W to -2.0 V) (See Figure 4) (Note 1) trise(Bus) Symbol Min Typ Max Unit
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9.0 9.0 11.15 11.86 15 15 tfall(Bus)
ms
ms
9.0 9.0 35
10.50 11.17 62
15 15 93 - -
tpwd(Bus)
ms ms
tfall(Bus I) trise(Bus I) Vharm
4.0 4.0 - -
5.85 8.17 -
Harmonic Content (Note 2) (9.0 V VBat 16 V, Bus Load = 16,500 pF and 300 W to -2.0 V, Peak Spectral Voltage from 0.53 to 1.67 Mhz) Propagation Delay (Tx Threshold to Rx Threshold) Tx to Bus Delay Time (Tx = 2.5 V to VBus = 3.875 V) 4X Mode Normal Mode
mV ms ms ms
80 25
tpd(Bus)
17.7 2.6 17.3
tTxDelay/4X tTxDelay/Norm
- 13
4.0 24
Rx Output Delay Time (Tx = 2.5 V to VBus = 3.875 V) (See Figure 5) Low-to-Output High High-to-Output Low
tRxDelay/L-H tRxDelay/H-L
- -
0.11 0.38
2.0 2.0
Rx Output Transition Time (CRx = 50 pF to Gnd., 10% and 90% Points) (See Figure 6) Low-to-Output High High-to-Output Low Rx Output Transition Time (Note 3) (CRx = 50 pF to Gnd., Sleep = 0 V, 10% and 90% Points) (See Figure 6) Low-to-Output High High-to-Output Low
ms
tRxTrans/L-H tRxTrans/H-L
- -
0.34 0.08
1.0 1.0
ms
tRxTrans/L-H tRxTrans/H-L
- -
0.32 0.08
5.0 5.0
NOTES 1. Typical is the parameter's approximate average value with VBat = 13 V, TA = 25C. 2. Device characterized but not production tested for Harmonic Content. 3. Rx Output Transition Time from a sleep state.
4
MOTOROLA ANALOG IC DEVICE DATA
MC33390
Figure 2. Bus Rise and Fall Times
3.5 V Tx 0.8 V 64 msec 5.0 V Tx 0 64 msec
Figure 3. Pulse Width Distortion
80% Bus 20% trise tfall
6.25 V Bus 3.875 V 1.5 V
tpwd(min) tpwd tpwd(max)
Figure 4. Bus Output External Capacitor Current and Output Voltage versus Time
80% BUS EXTERNAL CAPACITOR CURRENT
20% 0 20%
80%
BUS VOLTAGE
MOTOROLA ANALOG IC DEVICE DATA
AAAAAA AAAAAA AAAAAA AAAAAA AAAAAAAAA AAAA
tfall(low-to-output high) trise(high-to-output low) tfall(high-to-output low) 2 4 6 TIME (ms) 8 10 12
trise(low-to-output high)
5
MC33390
Figure 5. Bus-to-Rx Delay Time
122 msec 3.875 V
Figure 6. Rx Rise and Fall Time
tRxRise/L-H tRxFall/H-L 90% Rx 10% 90%
Bus
Figure 7. Loss of Gnd or +VBat Test Circuit
Figure 8. Typical Secondary Node Application Circuit
40 mH +VBat 1000 mF 0.1 mF 47 mH 470 pF (Total Node Capacitance) Primary Node 25 V MOV
6
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tRxDelay/low-to-output high tRxDelay/high-to-output low Rx MCU Rx
10% 2.5 V
AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA AAAAAA
+VBat Bus MC33390 Gnd Load Sleep 5.0 V Reference Tx 4X/Loop
IBus(Loss) -18 V to 9.0 V
ILoad(Loss)
Bus
MC33390
10.7 kW
Secondary Nodes
Load Gnd
MOTOROLA ANALOG IC DEVICE DATA
MC33390
Figure 9. Minimum Bus Load
One Primary Node Bus 10.7 kW Load 470 pF 1.5 kW 3300 pF Bus 10.7 kW Load 24 Secondary Nodes 470 pF 1.5 kW 3300 pF
Figure 10. Maximum Bus Load
Primary Node
Figure 11. Maximum Number of Nodes
31 Secondary Nodes Bus 10.7 kW Load 470 pF 342 W 14570 pF
446 W
11280 pF
FUNCTIONAL DESCRIPTION
The MC33390 is a serial link bus transceiver device design to meet SAE Standards J1850 Class B performance for bi-directional half-duplex communication. The device is packaged in an economical surface mount SO-8 plastic package. An internal block diagram of the device is shown in Figure 1. Input Power (VBat terminal) This is the only required input power source necessary to operate the MC33390. The internal voltage reference of the MC33390 will remain fully operational with a minimum of 9.0 V on this terminal. Bus transmissions can continue with battery voltages down to 5.0 V; the Bus output voltage will follow the battery voltage down and in doing so, track approximately 1.6 V below the battery voltage. The device will continue to receive and transmit Bus data to the microcontroller with battery voltages as low as 4.25 V. The terminal can withstand voltages from -0.6 V to 34 V. If reverse battery protection is required, an appropriate diode must be placed in series with this terminal to protect the IC. Sleep Input (Sleep terminal) This input is used to enable and disable the Class B transmitter; the Class B receiver is always enabled so long as adequate VBat terminal voltage is applied. When the Sleep terminal voltage is increased to greater than the VSleep(IH) threshold (logic `1'), the Class B transmitter is enabled. If this input is at a voltage below the VSleep(IL) threshold (logic `0') the Class B transmitter will be disabled and less than 30 mA of current will be drawn by the VBat terminal. This terminal can be connected either to switched ignition or to a microcontroller output for control. This terminal also provides a 5.0 V reference, internal to the device used to establish the Rx output level and slew rate times. Class B Functional Description The transmitter provides an analog wave-shaped 0 to 7.0 V waveform on the Bus output. It also receives waveforms and transmits a digital level signal back to a logic IC. The transmitter can drive up to 32 remote Class B transceivers. These remote nodes may be at ground potentials that are 2.0 V relative to the control assembly. Waveshaping will only be maintained during 2 of the 4 corners when the 0 to 2.0 V ground potential difference condition exists. The MC33390 is a remote node on the Class B Bus. Each remote transceiver has a 470 10% pF capacitor on it's output for EMI suppression purposes, as well as a 10.6 kW 5% pull down resistor to ground. The main node has a 3300 10% pF capacitor on it's output for EMI suppression, as well as a 1.5 kW 5% pull down resistor to ground. With more than 26 nodes there is no primary node; all nodes will have a 470 10% pF capacitor and a 10.6 kW 5% pull down resistor. No matter how many remote nodes are on the Class B Bus, the RC time constant of the Class B Bus is maintained at approximately 5.0 msec. The minimum and maximum capacitance and resistance on the Class B Bus is given by the expressions shown in Table 1.
Table 1. Class B Bus Capacitance and Resistance Expressions
Level Minimum Maximum (3.3 (3.3
0.9) + (0.47 0.9) = 3.39 nF 1.1) + 25(0.47 1.1) = 16.55 nF
Capacitance
(1.5 (1.5
0.95) || (10.6 0.95) / 25 = 314 W 1.05) || (10.6 1.05) = 1.38 kW
Resistance to Ground
MOTOROLA ANALOG IC DEVICE DATA
7
MC33390
CLASS B MODULE INPUTS
Transmitter Data from the MCU (Tx) The Tx input is a push-pull (N-channel/P-channel FETs) buffer with hysteresis for noise immunity purposes. This terminal is a 5.0 V CMOS logic level input from the MCU following a true logic protocol. A logic `0' input drives the Bus output to 0 V (via the external pull-down resistor to ground on each node) while a logic `1' input produces a high voltage at the Bus output. A logic `0' input level is guaranteed when the Tx input terminal is open circuited by virtue of an internal 40 k pull down resistor. No external resistor is required for it's operation. Waveshaping and 4X / Loop This input is a "tri-statable" input; 0 V = Normal waveshaping, 5.0 V = waveshaping is disabled for 4X transmitting, and high impedance = Loopback mode of operation. This is a logic level input used to select whether waveshaping for the Class B output is enabled or disabled; A logic `0' enables waveshaping while a logic `1' disables waveshaping. In the 4X mode, the Bus output rise time less than 2.0 ms and the fall time is less than 5.0 ms (due to the external RC pull down to ground). In the Loopback condition the Tx signal is fed back to the Rx output after waveshaping without being transmitted onto the Bus. This mode of operation is useful for system diagnostic purposes.
CLASS B MODULE OUTPUTS
Transceiver Output (Bus) This is the output driver stage that sources current to the bus. It's output follows the waveshaped waveform input. It's output voltage is limited to 6.25 V to 8.0 V under normal battery level conditions. The limited level is controlled by an internal regulator/clamp circuit. Once the battery voltage drops below 9.0 V, the regulator/clamp circuit saturates, causing the Bus voltage to track the battery voltage. A 1.5 kW 5% external resistor (as well as any 10.6 kW pull down resistors of any remote nodes) sinks the current to discharge the capacitors during high to low transitions. This sourcing output is short circuit protected (60 to 170 mA) against a short to -2.0 V and sinks less than 1.0 mA when shorted to VBat. If a short occurs, the over temperature shutdown circuit protects the source driver of the device. In the event battery power is lost to the assemble, the Bus transmitter's output stage will be disabled and the leakage current from the Bus output will not source or sink more than 100 mA of current. The transceiver will operate with a remote ground offset of 2.0 V but the lower corners of transmission will not be rounded during this condition. Receiver Output to the Microcontroller (Rx) This is a 5.0 V CMOS compatible push-pull output used to send received data to the microcontroller. It does not require an external pull-up resistor to be used. The receiver is always enabled and draws less than 65 mA of current from VBat. When voltage on the Bus is under 3.5 V, the output is a logic `0'. There is a minimum of 0.1 V of hysteresis between the Bus high and low (and vice versa) transition points. The initial state of this output is always a logic `0' after supply voltage is applied, but before the Sleep terminal goes to a logic `1' state. The MC33390 always goes into normal operation from a Sleep state. The receiver circuitry is able to operate with VBat voltages as low as 4.25 V and still remains capable of "waking up" the MC33390 when remote Class B activity is detected. When the MC33390 is in a Sleep state and there occurs message activity is on the Bus; the receiver passes the Bus message through to the microcontroller from the Rx terminal and the microcontroller makes the determination to "wake up" the MC33390 by pulling Sleep to a logic "1" state in preparation for the microcontroller's transmitting data to be presented to the Tx terminal. The MC33390 does not automatically "wake up" from a sleep state when Bus activity occurs; the microcontroller must tell it to do so. In the specification table; The maximum voltage for Rx is specified as 4.75 V over an operating range of -40 to 125C temperature and 7.0 to 16 V VBat. This maximum Rx voltage is compatible with the minimum V DD voltage of microcontrollers to prevent the MC33390's sourcing current to the microcontroller's output. Switched Ground Output (Load) Normally, this output is a saturated switch to ground, which pulls down the external resistor between the Bus and Load outputs. In the event ground is lost to the assembly; the Load output will bias itself "off" and will not leak more than 100 mA of current out of this terminal. Over Temperature Shutdown If the Bus output becomes shorted to ground for any duration; an over temperature shutdown circuit "latches off" the output source transistor whenever the die temperature exceeds 150 to 190C. The output transistor remains latched off until the Tx input is toggled from a logic `0' to a logic `1'; The rising edge provides the clearing function providing the locally sensed temperature is 10 to 15C below the latch off temperature trip temperature. Wave-Shaping Wave-shaping is incorporated into the MC33390 to minimize EMI conducted emissions. The major contributor to EMI emissions in the AM broadcast band is the rise and fall times of current in the capacitive load during output transitions; occurring during the "rounded corners" time of the voltage waveform. In order to provide a controlled rise time, the output voltage is a second order function, I = C dv/dt, during this transition time. An internal two stage analog integrator circuit achieves this waveshaping. The final output stage current amplifies this voltage and drives the Bus output. Receiver Protocol The Class B communication scheme uses a variable pulse width (VPW) protocol. The microcontroller provides the VPW decoding function. Once the receiver detects a transition on Rx, it starts an internal counter. The initial "start of frame" bit is a logic `1', and lasts 200 msec. For subsequent bits, if there is a Bus transition before 96 msec, one logic state is inferred. If there is a Bus transition after 96 mSec, the other logic state is inferred. The "end of data" bit is a logic `0', and lasts 200 msec. If there is no activity on the bus for 280 to 320 msec
8
MOTOROLA ANALOG IC DEVICE DATA
MC33390
following a broadcast message, multiple unit nodes may arbitrate for control of the next message. During an arbitration, after the "start of frame" bit has been transmitted, the remote unit transmitting the most consecutive logic `0' bits will be granted sole transmission access to the bus for that message. Loss of Assembly Ground Connection The definition of a loss of assembly ground condition at the device level is that all terminals of the MC33390, except Bus and Load, see a very low impedance to VBat. The Load terminal of the device has an internal transistor switch connected to it which is normally saturated to ground; This pulls the Load-side of the external resistor (tied from Bus to Load) to ground under normal conditions. The Load terminal switch essentially that of an "up-side down" FET which is normally biased "on", so long as module ground is present, and biased "off" when loss-of-ground occurs. When a loss of assembly ground occurs; the Load transistor switch is self-biased "off", allowing no more than 100 mA of leakage current to flow in the Load terminal. During such a loss of assembly ground condition the Bus and Load terminals exhibit a high impedance to VBat; all other terminals will exhibit a low impedance to VBat. During this condition the Bus terminal is prevented from sourcing any current or loading the Bus which would cause a corruption of any data being transmitted on the Bus. While a particular assembly is experiencing a loss of ground; all other assembly nodes are permitted to function normally. It should be noted that with other nodes existing on the Bus, the Bus will always have some minimum/maximum impedance to ground as shown in Table 1. Loss of Assembly Battery Connection The definition of a loss of assembly battery condition at the device level is that the VBat terminal of the MC33390 sees an infinite impedance to VBat, but there is some undefined impedance looking from these terminals to ground. Bulk Current Injection (BCI) and Conducted Sinusoidal Enhancement Circuitry The Class B output driver of the MC33390 is an active high side switch requiring the use of an external passive pull down to ground resistor; 1.5 kW for "Master" units and 10.6 kW for "Slave" units. Under capacitive or inductive coupled noise conditions, it takes but a few milli-amperes of induced current to cause the Class B Bus to latch to a "high" state. The MC33390 will operate properly when using the application circuit shown in Figure 8 when exposed to externally induced AC noise conditions as experienced in typical automotive applications.
MOTOROLA ANALOG IC DEVICE DATA
9
MC33390
OUTLINE DIMENSIONS
D SUFFIX PLASTIC PACKAGE CASE 751-06 ISSUE T (SO-8) A
8
D
5
C
E
1 4
H
0.25
M
B
M
h B C e A
SEATING PLANE
X 45 _
NOTES: 1. DIMENSIONING AND TOLERANCING PER ASME Y14.5M, 1994. 2. DIMENSIONS ARE IN MILLIMETER. 3. DIMENSION D AND E DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 PER SIDE. 5. DIMENSION B DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.127 TOTAL IN EXCESS OF THE B DIMENSION AT MAXIMUM MATERIAL CONDITION. DIM A A1 B C D E e H h L MILLIMETERS MIN MAX 1.35 1.75 0.10 0.25 0.35 0.49 0.19 0.25 4.80 5.00 3.80 4.00 1.27 BSC 5.80 6.20 0.25 0.50 0.40 1.25 0_ 7_
q
L 0.10 A1 B 0.25
M
CB
S
A
S
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Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. "Typical" parameters which may be provided in Motorola data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. Motorola does not convey any license under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part. Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer. Mfax is a trademark of Motorola, Inc. How to reach us: USA / EUROPE / Locations Not Listed: Motorola Literature Distribution; P.O. Box 5405, Denver, Colorado 80217. 1-303-675-2140 or 1-800-441-2447 Customer Focus Center: 1-800-521-6274 MfaxTM: RMFAX0@email.sps.mot.com - TOUCHTONE 1-602-244-6609 ASIA / PACIFIC: Motorola Semiconductors H.K. Ltd.; Silicon Harbour Centre, Motorola Fax Back System - US & Canada ONLY 1-800-774-1848 2, Dai King Street, Tai Po Industrial Estate, Tai Po, N.T., Hong Kong. - http://sps.motorola.com/mfax/ 852-26629298 HOME PAGE: http://motorola.com/sps/ JAPAN: Motorola Japan Ltd.; SPD, Strategic Planning Office, 141, 4-32-1 Nishi-Gotanda, Shinagawa-ku, Tokyo, Japan. 81-3-5487-8488
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MC33390/D MOTOROLA ANALOG IC DEVICE DATA

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