User Manual

Electrical Characteristics
December 2007 Revision 3.5 41/48
13.4 Communication Link DC Characteristics and Timing
Parameters Conditions Min. Typ. Max. Unit Comments
RX_TTL Input Voltage Low 0 1 V
RX_TTL Input Voltage High 4 5 V
RX_TTL Input Current 1 µA
TX_TTL Output Voltage Low 0.6 V
TX_TTL Output Voltage High 4.3 V
TX_TTL Output Current 20 µA Sunk or sourced
TX_TTL Output Capacitance 50 pF
RX_RS232 Input Voltage Range -25 +25 V
RX_RS232 Input Threshold Low 25°C 0.8 1.5 V
RX_RS232 Input Threshold High 25°C 1.8 2.4 V
RX_RS232 Input Hysteresis 1.8 2.4 V
RX_RS232 Input Resistance 3 5 7
kΩ
TX_RS232 Output Voltage Swing
Loaded with 3 kW to
GND
±5 ±5.4 V
TX_RS232 Output Resistance 300 1000
kΩ
TX_RS232 Short-circuit Current ±60 mA
IEC 1000-4-2 Air-
Gap Discharge
±15 kV
IEC 1000-4-2
Contact Discharge
±8 kV
ESD Protection on both pins
Human body model ±15 kV
4800 Bps +0.16 %
9600 Bps -1.36 %
19200 Bps +1.73 %
RX - TX error on baud rate
38400 Bps +1.73 %
TX Inter-character time 7.5 ms