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MSM5547 Datasheet

  • MSM5547

  • Digital Clock

  • 103.41KB

  • OKI

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FEDL5547-03
隆 Semiconductor
FEDL5547-03
This version: May. 2000
MSM5547
Previous version: Nov. 1999
隆 Semiconductor
MSM5547
Digital Clock
GENERAL DESCRIPTION
MSM5547 is a clock IC having a wide power supply range with 4.194304 MHz original
oscillation. MSM5547 is a 12 hour cycle AM/PM clock for a static fluorescent character display
tube. Time correction is in hour, minute and 30 minute adjustments. Hour and minute are
corrected by a 2 Hz fast-forward function. MSM5547 also has a contrast adjustment function for
the fluorescent character display tube, which can set four levels of contrast, including 100%
duty.
FEATURES
鈥?12 hour clock (AM/PM)
鈥?Applied for static fluorescent character display tube
鈥?Wide power supply range: 4 to 16V
鈥?4.194304 MHz original oscillation
鈥?4 levels of contrast can be selected
鈥?Package options:
44-pin plastic QFP (QFP44-P-910-0.80-L2)
(Product name: MSM5547GS-L2)
BLOCK DIAGRAM
CMOS
OSC OUT
OSC IN
TEST 1
TEST 2
TEST 3
V
SS
Time adjustment
Oscil-
lation
Frequency dividers
1 Hz
64 Hz
1 Hz
a
1
b
1
V
DD
Test
adjust-
ment
1 / 60
Decod-
er
seg-
ment
V
DD
A/C
SE
ZA
MS
HS
V
SS
DIM CONT 1
DIM CONT 2
DIM
TEST 4
V
SS
V
DD
Con-
trast
adjust-
ment
(1 / 60)
Hour counter
(1 / 12)
AM
PM
Decod-
er
seg-
ment
Driver [PCH open drain]
Minute counter
g
3
b
4
c
4
AM
PM
V
DD
1/10

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