5-14 Keysight N5224A/25A Service Guide
Theory of Operation
Synthesized Source Group Operation
5-
Table 5-1
TEST SET I/O Connector Pin Assignments
DB-25 Female Connector
Pin Numbers
Name
Function
1
SEL0
TTL out, test set select bit 0, tied to 0 V
2
Sweep Holdoff In
TTL in, low level holds off sweep
3–6
AD12–AD8
TTL I/O, address and latched data
7
GND
0 V, ground reference
8
LAS
TTL out, active low address strobe (1
μ
s min)
9–11
AD4–AD2
TTL I/O, address and latched data
12
GND
0 V, ground reference
13
Interrupt In
TTL in, low level (10
μ
s min) aborts sweep
14
+22 V
+22 Vdc, 100 mA max.
15–16
SEL1–2
TTL out, test set select bits 1-2, tied to 0 V
17
AD11
TTL I/O, address and latched data
18
SEL3
TTL out, test set select bit 3, tied to 0 V
19–21
AD7–5
TTL I/O, address and latched data
22–23
AD0–1
TTL I/O, address and latched data
24
LDS
TTL out, active low data strobe (1
μ
s min)
25
RLW
TTL out, high = read, low = write
