User`s guide

Table Of Contents
Chapter 10 159
Communication with External Instruments Using Handler I/O Port
Electrical Characteristics
10. Communication with External
Instruments Using Handler I/O Port
Output signal
All output signals are TTL compatible. Table 10-8 shows the electrical characteristics of
output signals. Figure 10-8 shows the circuit diagram of output signals.
Figure 10-8 Circuit diagram of output signals
Power supply (+5 V)
Table 10-9 shows electrical characteristics of +5 V power supply for external instruments.
Table 10-8 Electrical characteristics of output signals (typical)
Maximum rate output current -10 mA to 10 mA
Output current
High level -5 mA
Low level 3 mA
Output voltage
High level
2.0 V to 3.3 V (when output current is from -5 mA to 0 mA)
3.20 V (when output current is -1 mA)
2.75 V (when output current is -5 mA)
Low level
0 V to 0.8 V (when output current is from 0 mA to 3 mA)
0.25 V
*1
(when output current is 1 mA)
0.55 V (when output current is 3 mA)
*1.
Notice that, in case of C0 to C3 (port C) and D0 to D3 (port D), output voltage
is 0.30 V.
Table 10-9 Electrical characteristics of +5 V power supply (typical)
Output voltage 4.5 V to 5.5 V
Maximum output current 100 mA