22 | Keysight | E4990A Impedance Analyzer 20 Hz to 10/20/30/50/120 MHz - Data Sheet
Table 1. 24 bit I/O port pin assignment
Pin No.
1
Signal Name
Signal Standard
GND
0 V
2
INPUT1
TTL level, pulse input, pulse width: 1 µs or above
TTL level, latch output
3
OUTPUT1
4
OUTPUT2
TTL level, latch output
5
Output port A0
TTL level, latch output
6
Output port A1
TTL level, latch output
7
Output port A2
TTL level, latch output
8
Output port A3
TTL level, latch output
9
Output port A4
TTL level, latch output
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
Output port A5
TTL level, latch output
Output port A6
TTL level, latch output
Output port A7
TTL level, latch output
Output port B0
TTL level, latch output
Output port B1
TTL level, latch output
Output port B2
TTL level, latch output
Output port B3
TTL level, latch output
Output port B4
TTL level, latch output
Output port B5
TTL level, latch output
Output port B6, index (selectable)
Output port B7, ready for trigger (selectable)
Input/output port C0
Input/output port C1
Input/output port C2
Input/output port C3
Input/output port D0
Input/output port D1
Input/output port D2
Input/output port D3
Port C status
TTL level, latch output
TTL level, latch output
TTL level, latch output
TTL level, latch output
TTL level, latch output
TTL level, latch output
TTL level, latch output
TTL level, latch output
TTL level, latch output
TTL level, latch output
TTL level, input mode; LOW, output mode: HIGH
TTL level, input mode; LOW, output mode: HIGH
TTL level, active low, pulse output (width: 10 µs, Typical)
Port D status
Write strobe signal
+5 V pullup
SWEEP END signal
+5 V
TTL level, active low, pulse output (width: 20 µs, Typical)
+5 V, 100 mA MAX
PASS/FAIL signal
PASS/FAIL write strobe signal
TTL level, PASS: HIGH, FAIL; LOW, latch output
TTL level, active low, pulse output (width: 10 µs, Typical)
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