INTEGRAL
IL8560
CLOCK CIRCUIT
FEATURES
•
LED direct drive by time-sharing
(duplex)
•
Wide operating voltage range
•
Alarm on a 24-hour basis
•
Time format: 12-hour AM/PM and 24-
hour
•
On-chip RC-oscillator for battery
backup
•
50Hz or 60Hz is usable as the
reference frequency
•
Possible to automatically advance
"hours", "minutes"
•
Sleep timer (max. 59 minutes or 1
hour 59 minutes)
•
Repeatedly usable snooze
•
•
•
•
Power failure indicator
900Hz output for alarm tone
Bare chip or SOP-28 are available
Pin-to-Pin replacement with Sanyo
LM8560
FUNCTIONS
•
Real time display
•
Alarm with snooze
•
Sleep timer (max. 59 minutes or 1 hour 59
minutes)
PIN CONNECTION
OPERATION DESCRIPTION
50Hz/60Hz Input:
CR Input:
50/60 select input:
Display mode select input
(alarm display/sleep display);
The on-chip Schmitt trigger circuit allows a simple RC filter at the
input to remove possible line voltage transients. An internal pull-up
resister is provided.
Then AC power-down occurs, the time counter enters the "hold" mode and
the on-chip clock oscillator starts operating immediately. If there is no input at
"50/60 Hz input" during 3-clock period, this oscillator controls the time counter
advance instead of "50/60Hz input". The values of CR determine the
frequency of the on-chip clock oscillator. All segment outputs are off during
backup oscillator operation.
NOTE: If the backup OSC is used at the power-down mode, "50/60Hz
input" must be open or at Vss level.
Connecting "50/60Hz select" to Vss enables 50Hz operation. For 60Hz
operation, "50/60Hz select" is left unconnected: Pull-down to V
DD
is provided
by the internal pulldown resister.
The internal pull-down resistor allows the use of 2 SPST (single-pole single-
throw) switches to select 4 display modes listed in Table 1.
1
BELMICROSYSTEMS
INTEGRAL [ INTEGRAL CORP. ]
