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6 Reference Information
6-6 SAM4S ER-380 SERIES
6-1 Semiconductor Base Diagram
6-1-4 Other ICs
Figure 6-11 SSCG FS781 Specification
Figure 6-12 VFD Driver UDN5812 Specification
4
5
6
7
8
9
10
19
20
21
22
23
24
25
L
OA
D
S
U
PP
L
Y
BB
V
O
U
T
2
O
U
T
7
O
U
T
8
O
U
T
19
O
U
T
18
O
U
T
13
12
13
14 27
28
17
18
SE
R
IA
L
D
ATA O
U
T
B
L
A
N
KI
N
G
L
OGI
C
S
U
PP
L
Y
ST
R
OBE
G
R
O
UND
CL
O
C
K
CL
K
ST
B
LN
K
O
U
T
9
O
U
T
10
O
U
T
12
O
U
T
11
11
L
AT
CH
ES
R
EGISTE
R
R
EGISTE
R
L
AT
CH
ES
2
32
6
27
28
SE
R
IA
L
D
ATA I
N
O
U
T
6
O
U
T
1
O
U
T
4
O
U
T
3
O
U
T
20
1
15
16
O
U
T
5
O
U
T
17
O
U
T
16
O
U
T
15
O
U
T
14
DD
V
M
OS
BIPO
L
A
R
O
U
T
1
O
U
T
2
G
R
O
UND
D
wg
. FP
-
013
-
1
O
U
T
3
O
U
T
N
CL
O
C
K
SE
R
IA
L
D
ATA I
N
ST
R
OBE
B
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A
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KI
N
G
SE
R
IA
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D
ATA O
U
T
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R
IA
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-
PA
R
A
LL
E
L
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IFT
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Refer to page 12 for package dimensions.
Pin Description
Pin No. Pin Name I/O TYPE Description
1/2 Xin / Xout I/O Analog Pins form an on-chip reference oscillator when connected to
terminals of an external parallel resonant crystal. Xin may be
connected to TTL/CMOS external clock source. If Xin
connected to external clock other than crystal, leave Xout (pin 2)
unconnected.
7/3 S0 / S1 I CMOS/TTL Di
g
ital control inputs to select input frequency ran
g
e and output
frequency scalin
g
. Refer to Tables 7 & 8 for selection. S0 has
internal pulldown. S1 has internal pullup.
4 LF I Analog Loop Filter. Single ended tri-state output of the phase detector. A
two-pole passive loop filter is connected to Loop Filter (LF).
6 FSOUT O CMOS/TTL Modulated Clock Frequency Output. The center frequency is the
same as the input reference frequency for FS781. Input
frequency is multiplied by 2x and 4x for FS782 and FS784
respectively.
8 VDD P Power Positive Power Supply.
5 VSS P Power Power Supply Ground
Table 1
Output Frequency Selection
Product Number FSOUT Frequency Scaling Description
FS781 1x 1x Modulated Frequency of Input Clock
FS782 2x 2x Modulated Frequency of Input Clock
FS784 4x 4x Modulated Frequency of Input Clock
Table 2. FSOUT SSCG (Modulated Output Clock) Product Selection
1
2
3
4
8
7
6
5
S0
VDD
Xin
Xout
FSOUT
VSS
LF
S1
FS78x
8 Pin TSSOP Package
1
2
3
4
8
7
6
5
Xin
Xout
S1
LF
VDD
S0
FSOUT
VSS
FS78x
8 Pin SOIC Package
36


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