rtd cpuModule CMA22M Series, Руководство пользователя

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BDM-610000069 Rev A Chapter 1: Introduction 13
Serial Ports - RS-232
V
OH
Output Voltage High R
L
= 3 k 5.0 V 10.0 V
V
OL
Output Voltage Low R
L
= 3 k -10.0 V -5.0 V
V
IH
Input Voltage High — 2.4 V 25 V
V
IL
Input Voltage Low — -25 V 0.8 V
Serial Ports - RS-422/485
V
OD1
Differential Output R
L
= 50 Ohm 2.0 V 6.0 V
V
OD2
Differential Output R
L
= 27 Ohm 1.5 V 6.0 V
V
OC
Common Mode
Output R
L
= 27 or 50
Ohm
0.0 V 3.0 V
V
TH
Differential Input
Threshold -7V < V
CM
< 7V -0.3 V 0.3 V
V
I
Absolute Max Input
Voltage — -25 V 25 V
aDIO
V
OH
Output Voltage High I
OH
= –4.0 mA 2.4 V 3.3 V
V
OL
Output Voltage Low I
OL
= 8.0 mA 0.0 V 0.4 V
V
IH
Input Voltage High
1
— 2.0 V 5.5 V
V
IL
Input Voltage Low
1
— -0.5 V 0.8 V
I
ADIOvcc
Supply current — 500 mA
aAIO
V
IH
Absolute maximum
Input Voltage +25 V
V
IL
Absolute minimum
Input Voltage -25 V
Utility Port Connector (CN5)
V
RTC
Input RTC Voltage
2
— 2.0V 3.6 V
I
UTILvcc
Utility Supply
Current — 500 mA
1. Maximum DC undershoot below ground must be limited to either 0.5V or 10mA. During
transitions, the device pins may undershoot to -2.0V or overshoot to 7.0V, provided it is less
than 10ns, with the forcing current limited to 200 mA.
2. Only required to maintain date and time when power is completely removed from the system.
Not required for board operation.
Table 4 Electrical Characteristics
Symbol Parameter Test Condition Min. Max.