MSM5547 Datasheet, PDF (1/10 Pages) OKI electronic componets – Digital Clock

FEDL5547-03
¡ _¡ Semicond_Suc_etor_miconductor
MSM5547
Digital Clock
FEDL5547-03
This version: M_May_S._M20₅0₅0₄₇
Previous version: Nov. 1999
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
• 12 hour clock (AM/PM)
• Applied for static fluorescent character display tube
• Wide power supply range: 4 to 16V
• 4.194304 MHz original oscillation
• 4 levels of contrast can be selected
• Package options:
44-pin plastic QFP (QFP44-P-910-0.80-L2) (Product name: MSM5547GS-L2)
BLOCK DIAGRAM
OSC OUT
OSC IN
Oscil-
lation
V_DD
TEST 1
TEST 2
TEST 3
A/C
Test
adjust-
ment
V_DD
V_SS
SE
ZA
MS
HS
DIM CONT 1
DIM CONT 2
DIM
TEST 4
V_SS V_DD
Con-
trast
adjust-
V_DD ^ment
V_SS
1 Hz
Frequency dividers
1 / 60
Minute counter
(1 / 60)
Hour counter
(1 / 12)
AM
PM
Decod-
er
seg-
ment
Decod-
er
seg-
ment
CMOS
64 Hz
1 Hz
a₁
b₁
g₃
b₄
c₄
AM
PM
1/10