NTE2062
Integrated Circuit
PMOS Digital Alarm Clock
Features:
D
SingleChip ED MOS LSI
D
LED Direct Drive by TimeSharing (Duplex)
D
Wide Operating Voltage Range
D
Alarm on a 24Hour Basis
D
Two Selections of Time Format:
AM/PM 12Hour Basis & 24Hour Basis
D
OnChip CR Oscillator for Battery Backup
D
50Hz or 60Hz Reference Frequency
D
Automatic Advance Capable:
"Hours", "Minutes"
D
Sleep Timer:
Max. 59 Minutes or 1Hour, 59 Minutes
D
Repeatedly Usable Snooze
D
Power Failure Indicator
D
900Hz Output for Alarm Tone
Functions:
D
Real Time Display
D
Alarm with Snooze
D
Sleep Timer
Applications:
D
Alarm Clock
D
Clock Radio
Absolute Maximum Ratings: (V
SS
= 0, T
A
= +25
C unless otherwise specified)
Maximum Supply Voltage, V
DD
max
15 to +0.3V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input Voltage, V
IN
50/60Hz
15 to +0.3V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Other Than 50/60Hz
15 to +0.3V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Voltage, V
OUT
15 to +0.3V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input Clamp Current, I
IN
0.4 to +0.4mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Allowable Power Dissipation (T
A
= +70
C), P
D
max
700mW
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Temperature Range, T
opr
30
to +70
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage Temperature Range, T
stg
55
to +125
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Allowable Operating Ranges: (V
SS
= 0, T
A
= +25
C unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Supply Voltage
V
DD
14
7.5
V
Input "HIGH" Level Voltage
V
IH
50/60Hz Input
1.0
V
Other Than 50/60Hz Input
1.5
V
Input "LOW" Level Voltage
V
IL
50/60Hz
V
DD
+2
V
Other Than 50/60Hz
V
DD
+2
V
Input Voltage on 50/60Hz
V
ACIN
Referenced to V
SS
V
LED
V
Electrical Characteristics: (V
DD
= 12V, T
A
= +25
C unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Input "HIGH" Level Current
I
IH
V
IN
= V
SS
, 50/60Hz
10
A
V
IN
= V
DD
, Input Pins other than 50/60Hz
20
A
Input "LOW" Level Current
I
IL
V
IN
= V
DD,
50/60Hz
10
A
V
IN
= V
DD
, Input Pins other than 50/60Hz
10
A
Output "HIGH" Level Current
I
OH
Alarm Out, Sleep Out, V
OH
= V
SS
1V
5
mA
10's Hr ag & de (24Hr Mode), V
OUT
=
V
SS
1V
36
mA
Segment Outputs other than above,
V
OUT
= V
SS
1V
18
mA
Output Leakage Current
I
OF
Alarm Out, Sleep Out, V
OUT
= V
DD
10
A
10's Hr ag & de (24Hr Mode), V
OUT
= V
DD
20
A
Segment Outputs other than above,
V
OUT
= V
DD
20
A
Power Failure Detect Voltage
V
DD
7.5
5.0
V
Current Dissipation
I
CC
Output: OFF, Input with PullDown
Resistor: Open
5
7
mA
Stability of Oscillator for Backup
F
S
Typical value, 900Hz, V
DD
= 9V
10%
10
+10
%
Accuracy of Oscillator for Backup
F
A
Typical value, 900Hz, V
DD
= 9V
10%
10
+10
%
Operation Description:
50Hz/60Hz Input:
The OnChip Schmitt Trigger circuit allows a simple RC filter at the input to remove possible line volt-
age transients. An internal pullup resistor is provided.
CR Input: (Note 1)
When AC powerdown occurs, the time counter enters the "hold" mode and the onchip clock oscilla-
tor starts operating immediately. If there is no input at "50/60Hz input" during 3clock period, this oscil-
lator controls the time counter advance instead of "50/60Hz input". The values of CR determine the
frequency of the onchip clock oscillator. All segment outputs are off during backup operation. If the
backup OSC is used at the powerdown mode, "50/60Hz input" must be open or at V
SS
level.
50/60Hz Select Input:
Connecting "50/60Hz select" to V
SS
enables 50Hz operation. For 60Hz operating, "50/60Hz select"
is left unconnected: Pulldown to V
DD
is provided by the internal pulldown resistor.
Display Mode Select Input (Alarm Display/Sleep Display):
The internal pulldown resistor allows the use of 2 SPST (singlepole singlethrow) switches to select
4 display modes listed in Table 1.
Table 1. Display Mode
Select Input
Alarm
Sleep
Display Mode
Digit No.1
Digit No. 2
Digit No. 3
Digit No. 4
N.C.
N.C.
Time Display
10's Hour, AM/PM
Hour
10's Minute
Minute
V
SS
N.C.
Alarm Display
10's Hour, AM/PM
Hour
10's Minute
Minute
N.C.
V
SS
Sleep Display
Blanked
Hour
10's Minute
Minute
V
SS
V
SS
Seconds Display
Blanked
Minute
10's Second
Second
Note 1. If V
SS
is applied to 2 input of "alarm display" and "sleep display" simultaneously, the seconds
display mode is entered.
Operation Description (Cont'd):
Time Setting Input:
Two setting inputs for 'Hours' and 'Minutes' are provided. The application of V
SS
causes the time set-
ting in Table 2 to occur. An internal pulldown resistor each is provided.
Table 2. Setting Contents
Display Mode
Set Input
Functions
Time
Hour
'Hours' are incremented +1 immediately and advance at a 2Hz rate 1/4 to 3/4
seconds later.
Minute
'Minutes' are incremented +1 immediately and advance at a 2Hz rate 1/4 to 3/4
seconds later.
Both
Both operations shown above are preformed.
Seconds
Hour (Note 2)
'Seconds' are cleared to [00].
(Alarm & Sleep)
Minute
"Hold" mode.
Both (Note 3)
'Hours" and 'Minutes' are reset to [0:00] (24Hour basis) or [12:00] (12Hour basis)
Alarm
Hour
'Hours' are incremented +1 immediately and advance at a 2Hz rate 1/4 to 3/4
seconds later.
Minute
'Minutes' are incremented +1 immediately and advance at a 2Hz rate 1/4 to 3/4
seconds later.
Both
'Hours" and 'Minutes' are reset to [0:00] (24Hour basis) or [12:00] (12Hour basis)
Sleep
The moment V
DD
is applied to "Sleep Display", the sleep counter is set to [:59].
Hour
The moment V
DD
is applied to "Sleep Display" and "Hour Set" simultaneously,
the sleep counter is set to [1:59].
Minute
The sleep counter counts down at a 2Hz rate.
Both
The sleep counter counts down at a 2Hz rate.
Note 2. When "Seconds" display is at 50 to 59, "Seconds" are reset to [00] and a carry occurs to incre-
ment "Minutes" +1.
Note 3. Once the reset mode or hold mode is entered, another function is locked until both "Hour Set"
input and "Minute Set" inputs are released.
12/24Hour Select Input:
Leaving this pin unconnected (V
DD
) causes the 12Hour basis to be selected; connecting this pin
to V
SS
causes the 24Hour basis to be selected. An internal pulldown resistor is provided.
Power Failure Indicator:
If the power supply voltage drops and is applied again, all the onsegments flash and the power failure
indication mode is entered. The power failure indication mode is released by applying V
SS
to "Hour
Set" or "Minute Set".
Alarm Operation and Alarm Output:
When the alarm set time is reached, the alarm signal is delivered. This signal continues to be deliv-
ered for 1 hour 59 minutes unless reset by "Alarm Off" or "Snooze Input". This signal is provided for
the tonesignal of 900Hz with 50% duty of 2Hz gated. A simple LPF can be used to turn this alarm
signal into DC signal as required.
Snooze Input:
By momentarily connecting this pin to V
SS
at the alarm onstate, the alarm output is inhibited for 8
to 9 minutes, after which the alarm signal is delivered again. The snooze function can be used repeat-
edly for 1 hour 59 minutes. An internal pulldown resistor is provided. By connecting "Snooze Input"
to V
SS
at the alarm offstate, the sleep timer counter is reset to [0:00]. (The sleep timer is reset with
one touch).
Operation Description (Cont'd):
Alarm Off Input:
Connecting this input pin to V
SS
inhibits the alarm output momentarily. An internal pulldown 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 V
SS
at the sleep output onstate, the sleep
output is inhibited.
V
SS
V
DD
Pin Connection Diagram
Min b & g
Hr b & g
Snooze Input
50/60Hz Select
Sleep Input
50/60Hz Input
CR Input
AM & 10's Hr ag & de
10's Min b & g
Min c & d
Hour Set
Min Set
1
2
3
4
PM & 10's Hr b
10's Hr c & Hr c
5
Hr c & d
6
Hr a & f
7
10's Min a & f
8
28
27
26
25
12/24 Hr Select
24
23
22
21
9
10's Min c & d
20
Alarm Disp
Alarm Off
10
10's Min e & Min e
11
19
18
Sleep Out
12
17
Alarm Out
13
Min a & f
16
14
Colon Out
15
1.070 (27.17)
Max
.910 (23.11)
.338
(8.6)
.400
(10.16)
.194
(4.95)
.122
(3.1)
Min
.070 (1.78)
1
14
28
15
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