FEDL5547-03
¡ Semiconductor
FEDL5547-03
This version: May. 2000
MSM5547
Previous version: Nov. 1999
¡ 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
• 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
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
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FEDL5547-03
¡ Semiconductor
MSM5547
PIN CONFIGURATION (TOP VIEW)
37 TEST 2
34 AM
41 TEST 1
38 TEST 3
40 TEST 4
43 PM
36 MS
39 NC
35 HS
42 ZA
b
4
33
f
3
32
a
3
31
b
3
30
1 Hz 29
f
2
28
a
2
, d
2
27
b
2
26
f
1
25
a
1
24
b
1
23
A/C 22
OSC OUT 21
OSC IN 20
V
SS
19
DIM CONT2 18
NC 17
DIM CONT1 16
V
DD
15
SE 14
DIM 13
64 Hz 12
44 c
4
1 g
3
2 e
3
3 d
3
4 c
3
5 g
2
6 e
2
7 c
2
8 g
1
9 e
1
10 d
1
11 c
1
44-pin plastic QFP
(Model name indicated on actual product is M5547)
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FEDL5547-03
¡ Semiconductor
MSM5547
ABSOLUTE MAXIMUM RATINGS
Parameter
Power Supply Voltage
Input Voltage
Input Current
P Channel Open Drain
Output Pin Withstanding Voltage
P Channel Open Drain
Output Current
Power Dissipation
Storage Temperature Range
Symbol
V
DD
- V
SS
V
I
I
I
V
O
I
O
P
D
T
STG
—
Ta = 25°C
Condition
Rating
–0.3 to +18
V
SS
– 0.3
£
V
I
£
V
DD
+ 0.3
±10
V
DD
– 26
–10
200
–55 to +150
Unit
V
V
mA
V
mA
mW
°C
RECOMMENDED OPERATING CONDITIONS
Parameter
Power Supply Voltage
Operating Temperature
Crystal Frequency
Symbol
V
DD
- V
SS
T
OP
f(x'tal)
Condition
—
—
—
Range
4 to 16
–30 to +85
4.194304
Unit
V
°C
MHz
ELECTRICAL CHARACTERISTICS
DC Characteristics
Parameter
Input Voltage "1" level
"0" level
TEST 1
TEST 2
ZA, MS, HS, DIM
DIM CONT1
"L" Input Current
TEST 3, 4
"L" Input Current
A/C
"L" Input Current
SE, DIM CONT2
(V
DD
= 6.0 V, V
SS
= 0 V, Ta = –30 to +85°C)
Symbol
V
IH
V
IL
I
IH1
Condition
—
—
V
I
= V
DD
Min
4.3
—
30
Typ
—
—
—
Max
—
1.0
150
mA
Unit
V
"H" Input
Current
I
IL1
I
IL2
I
IL3
V
OH
V
OL
I
OH1
I
OL1
I
OH2
I
OL2
I
OH3
I
OL3
I
DD
V
I
= V
SS
–120
–3
–30
—
—
—
—
—
—
—
—
—
—
—
—
–800
–12
–150
—
0.1
—
–1.0
—
–1.0
—
—
2
mA
Output
Voltage
"1" level
(All output)
"0" level
(64 Hz output)
I
OH
= 0A
I
OL
= 0A
V
OH
= 4.0 V
V
OL
= 0 V
V
OH
= 4.0 V
V
OL
= 0 V
V
OH
= 5.5 V
V
OL
= 0.5 V
C
IN
= 39 pF
±5%
C
OUT
= 33 pF
±5%
C
I
= 70
W
±5%
f(x'tal) = 4.194304 MHz
No load
5.9
—
–2000
—
–1000
—
–100
100
—
V
Output
Current
Output
Current
Output
Current
1 Hz, a
2
, d
2
, AM,
PM output pins
Other segment output
pins except above
mA
mA
mA
mA
64 Hz output pin
Dynamic Operating Current
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FEDL5547-03
¡ Semiconductor
MSM5547
FUNCTIONAL DESCRIPTION
Time Base
•4.194304 MHz crystal oscillator
•Internal crystal oscillation circuit (AMP, feedback resistance)
7 Segment Display Format
Display Device
•4 digit static fluorescent character display tube (with AM, PM, colon)
•Colon display blinks at 1 Hz with a 50% duty ratio
•Relationship between Driver Outputs and DF Display Tube
Relationship between Driver Output and DF Display Tobe
a3
a2
b3
1Hz
f2
g2
c3
1Hz
e2
d2
c2
e1
b2
f1
a1
b1
g1
c1
d1
AM
b4
f3
g3
PM
c4
e3
d3
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FEDL5547-03
¡ Semiconductor
MSM5547
Contrast Selecting Function
Selector pin name
DIM
"0"
(or open)
"1"
"1"
"1"
DIM CONT1
*
"0"
(or open)
"0"
(or open)
"1"
DIM CONT2
*
"1"
(or open)
"0"
"1"
(or open)
Operation mode
100% duty display
25% (1/4) duty display
at 4096 Hz
12.5% (1/8) duty display
at 4096 Hz
6.25% (1/16) duty display
at 4096 Hz
“1”: high level, “0”: low level, *: don’t care
Display Mode
• For 12 hour display, hour-minute 4-digit display
Hour display: 1 to 12
Minute display: 0 to 59
• 0 at highest digit is not displayed.
(Highest digit zero suppress function)
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