Operation Description (Cont’d):
Alarm Off Input:
Connecting this input pin to VSS inhibits the alarm output momentarily. An internal pull–down resistor
is provided.
Sleep Timer and Sleep Output:
The sleep output can be used to keep the radio turned on for any period of time up to 59 minutes or
1 hour 59 minutes. Table 2 shows how to select the period (59 minutes or 1 hour 59 minutes). This
sleep timer uses a down counter. When the counter contents reach [00], the output stops being deliv-
ered, turning off the radio. By connecting “Snooze Input” to VSS at the sleep output on–state, the sleep
output is inhibited.
Pin Connection Diagram
AM & 10’s Hr ag & de 1
PM & 10’s Hr b 2
10’s Hr c & Hr c 3
Hr b & g 4
Hr c & d 5
Hr a & f 6
10’s Min a & f 7
10’s Min b & g 8
10’s Min c & d 9
10’s Min e & Min e 10
Min b & g 11
Min c & d 12
Min a & f 13
Colon Out 14
28 12/24 Hr Select
27 CR Input
26 50/60Hz Select
25 50/60Hz Input
24 Snooze Input
23 Sleep Input
22 Hour Set
21 Min Set
20 VDD
19 Alarm Disp
18 Alarm Off
17 Sleep Out
16 Alarm Out
15 VSS