Epson RTC-72421 A - Manual (Page 5)

RTC - 72421 / 72423
Page - 2 MQ - 162 - 03
„ Terminal connections
RTC-72421 RTC-72423
1
2
3
4
5
6
7
8
9
18
17
16
15
14
13
12
10
11
STD.P
CS 0
ALE
A 0
A 1
A 2
A 3
RD
GND
V DD
( ) V DD
(V
DD
)
CS 1
D 0
1
2
3
WR
D
D
D
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
13
14
STD.P
CS 0
ALE
A 0
A 1
A 2
A 3
RD
GND
N.C.
N.C.
N.C.
V DD
( )
N.C.
CS 1
D 0
D 1
D 2
D 3
WR
V DD
( ) V DD
N.C.
N.C.
The (V DD ) pins are at the same electrical level as V DD . Do not connect these pins externally. The N.C. pins are not connected
internally. Ground them in order to prevent noise.