Silan
Semiconductors
SC9256
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
REV: 1.0
2002.01.30.
1
PLL FOR DTS
DESCRIPTION
The SC9256 is phase-locked loop (PLL) LSIs for digital tuning
systems (DTS) with built in 2 modulus prescalers.
All functions ate controlled through 3 serial bus lines. These LSIs
are used to configure high-performance digital tuning system.
FEATURES
* Optimal for configuring digital tuning systems in high-fi tuners
and car stereos.
* built-in prescalers. Operate at input frequency ranging from
30~150 MHz during FM
IN
input (with 2 modulus prescaler) and
at 0.5~40MHz during AM
IN
input (with 2 modulus prescaler or
direct dividing).
* 16 bit programmable counter, dual parallel output phase
comparator, crystal oscillator and reference counter.
* 3.6MHz, 4.5MHz, 7.2MHz or 10.8MHz crystal oscillators can be
used.
* 15 possible reference frequencies. ( When using 4.5MHz crystal)
* Built-in 20 bit general-purpose counter for such uses as
measuring intermediate frequencies (IF
IN1
and IF
IN2
)
* High-precision (
0.55~
7.15
s) PLL phase error detection.
* Numerous general-purpose I/O pins for such uses as peripheral
circuit control.
* 3 N-channel open-drain output ports (OFF withstanding
voltage:12V) for such uses as control signal output.
DIP-16-300-2.54
SOP-16-300-1.27
* Standby mode function (turns off FM, AM
and
IF
amps)
to
save
current
consumption.
* All functions controlled through 3 serial
bus lines.
* CMOS structure with operating power
supply range of V
DD
=5.0
0.5V.
ORDERING INFORMATION
Device Package
SC9256
DIP-16-300-2.54
SC9256S
SOP-16-300-1.27
PIN CONFIGURATION
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
SC9256
XT
XT
PERIOD
CLOCK
DATA
OT-1
OT-2
OT-3
DO2/OT-4
DO1
I/O-5/IF
IN1
GND
I/O-6/IF
IN2
FM
IN
AM
IN
V
DD
Silan
Semiconductors
SC9256
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
REV: 1.0
2002.01.30.
2
BLOCK DIAGRAM
1/2
2 MODULUS
PERSCALER
4bit SWALLOW
COUNTER
12bit PROGRAMMABLE COUNTER
OSC
CIRCUIT
REFERENCE COUNTER
MAX
24bit SHIFT REGISTER
24bit REGISTER
ADDRESS
DECODER
24bit REGISTER
OUTPUT PORT
20bit BINARY COUNTER
UNIVERSAL COUNTER
CONTROL
POWER ON
RESET
RESET
PH
AS
E
C
O
MPAR
AT
O
R
TRI-STATE
BUFFER
TRI-STATE
BUFFER
UNLOCK
OT4
I/
O
P
O
R
T
XT
1ms
AMP
AMP
AMP
FM
L
PSC
V
DD
GND
HF
FM
H
4
12
FM
LF
MODE
15
4
1ms
OSC
8
TEST
24
22
5
5
10
4
4
DO1
DO2/OT-4
I/O-6/IF
IN2
I/O-5/IF
IN1
OT-1 OT-2 OT-3
FM
IN
AM
IN
XT
XT
DATA
CLOCK
PERIOD
GATE
ABSOLUTE MAXIMUM RATINGS
(Ta=25
C)
Characteristic Symbol
Value
Unit
Supply Voltage
V
CC
-0.3~6.0
V
Input Voltage
V
IN
-0.3~V
DD
+0.3
V
N-ch Open-Drain Off withstanding Voltage
V
OFF
13
V
Power Dissipation
P
D
300(200)
mW
Operating Temperature
T
OPR
-40~85
C
Storage Temperature
T
STG
-65~150
C
( ): Flat package
Silan
Semiconductors
SC9256
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
REV: 1.0
2002.01.30.
3
ELECTRICAL CHARACTERISTICS
(unless otherwise specified, Ta= -40~85
C, V
DD
=4.5~5.58V.)
Characteristic Symbol
Test
Condition/Pin
Min
Typ.
Max
Unit
Operating Power Supply Voltage
V
DD1
PLL operation
(normal operating)
4.5
5.0
5.5
V
Operating Power Supply Current
I
DD1
V
DD
=5.0V,
XT=10.8MHz,
FMIN=150MHz
--
7
15
mA
Stand-by mode
Crystal
Oscillation
Frequency
Supply Voltage
V
DD2
PLL OFF
(Operating crystal
oscillation)
4.0
5.0
5.5
V
Operating Power Supply Current
I
DD2
V
DD
=5.0V, XT =10.8MHz
PLL OFF
--
0.8
1.5
mA
Operating Power Supply Current
I
DD3
V
DD
=5.0V, XT stop,
PLL OFF
--
120
240
A
Operating frequency range
Crystal Oscillation Frequency
f
XT
Connect crystal resonator
to XT- XT terminal
3.6
~
10.8
MHz
FM
IN
(FM
H
, FM
L
)
f
FM
FM
H,
FM
L
mode,
V
IN
=0.2Vp-p
30
~
130
MHz
FM
IN
(FM
L
)
f
FML
FM
L
mode, V
IN
=0.3Vp-p
30
~
150
MHz
AM
IN
(HF)
f
HF
HF mode, V
IN
=0.2Vp-p
1
~
40
MHz
AM
IN
(LF)
f
LF
LF mode, V
IN
=0.2Vp-p
0.5
~
20
MHz
IF
IN1
, IF
IN2
f
IF
V
IN
=0.2Vp-p
0.1
~
15
MHz
SC
IN
f
SC
V
IH
=0.7V
DD
, V
IL
=0.3V
DD
,
square wave input.
--
~
100
kHz
Operating input amplitude range
FM
IN
(FM
H
, FM
L
)
V
FM
FM
H,
FM
L
mode,
f
IN
=30~130MHz
0.2
~
V
DD
-0.5
Vp-p
FM
IN
(FM
L
)
V
FML
FM
L
mode, f
IN
=30~150MHz
0.3
~
V
DD
-0.5
Vp-p
AM
IN
(HF)
V
HF
HF mode, f
IN
=1~40MHz
0.2
~
V
DD
-0.5
Vp-p
AM
IN
(LF)
V
LF
LF mode, f
IN
=0.5~20MHz
0.2
~
V
DD
-0.5
Vp-p
IF
IN1
, IF
IN2
V
IF
F
IN
=0.1~15MHz
0.2
~
V
DD
-0.5
Vp-p
OT1~OT4 N-ch open drain
Output Current
"L" level
I
OL1
V
OL
=1.0V
5.0
10.0
--
mA
OFF-leak Current
I
OEF
V
OFF
=12V
--
---
2.0
A
(To be continued)
Silan
Semiconductors
SC9256
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
REV: 1.0
2002.01.30.
4
(Continued)
Characteristic Symbol
Test
Condition/Pin
Min
Typ.
Max
Unit
I/O-5~I/O-9, SC
IN
"H" level
V
IH1
0.7V
DD
~
V
DD
Input Voltage
"L" level
V
IL1
0
~
0.3V
DD
V
"H" level
I
IH
V
IH
=5V
--
--
2.0
Input Current
"L" level
I
IL
V
IL
=0V
--
--
-2.0
A
"H" level
I
OH4
V
OH
=4.0V (expect SC
IN
)
-2.0
-4.0
--
Output Current
"L" level
I
OL4
V
OL
=1.0V (expect SC
IN
)
2.0
4.0
--
mA
PERIOD, CLOCK, DATA
"H" level
V
IH2
0.8V
DD
~
V
DD
Input Voltage
"L" level
V
IL2
0
~
0.2V
DD
V
"H" level
I
IH
V
IH
=5V
--
--
2.0
Input Current
"L" level
I
IL
V
IL
=0V
--
--
-2.0
A
"H" level
I
OH5
V
OH
=4.0V (DATA)
-1.0
-3.0
--
Output Current
"L" level
I
OL5
V
OL
=1.0V (DATA)
1.0
3.0
--
mA
DO1, DO2
"H" level
I
OH3
V
OH
=4.0V
-2.0
-4.0
--
Input Current
"L" level
I
OL3
V
OL
=1.0V
2.0
4.0
--
mA
Tri-State Lead Current
I
TL
V
TLH
=5V, V
TLL
=0V
--
--
1.0
A
XT
"H" level
I
OH2
V
OH
=4.0V
-0.1
-0.3
--
Output Current
"L" level
I
OL2
V
OL
=1.0V
0.1
0.3
--
mA
Input feedback resistance
"H" level
Rf1
FMIN, AMIN, IFIN
(Ta=25
C)
350
700
1400
Input Feedback
Resistance
"L" level
Rf2
XT- XT (Ta=25
C)
500
1000
4000
k
PIN DESCRIPTION
Pin No. Symbol
Pin name
Description
Circuit diagram
1
XT
2
XT
Crystal oscillator
pins
Connects 3.6MHz, 4.5MHz, 7.2MHz
or 10.8MHz crystal oscillator to
supply reference frequency and
internal clock
XT
XT
V
DD
(To be continued)
Silan
Semiconductors
SC9256
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
REV: 1.0
2002.01.30.
5
(Continued)
Pin No. Symbol
Pin name
Description
Circuit diagram
3
PERIOD
Period signal input
4
CLOCK
Clock signal input
5
DATA
Serial data
input/output
Serial I/O ports. These pins transfer
data to and from the controller to set
divisions and dividing modes, and to
control the general-purpose counter
and general-purpose I/O ports.
Schmitt
input
DATA
V
DD
Schmitt input
CLOCK,PERIOD
6
OT-1
7
OT-2
8
OT-3
General-purpose
output ports
N channel open drain port pins, for
such uses as control signal output.
These pins are set to the OFF state
when power is turned on.
N-channel open drain
10
AMIN
11
FMIN
Programmable
counter input
These pins input FM and AM band
local oscillator signals by capacitor
coupling. FM
IN
and AM
IN
operate at
low amplitude.
V
DD
13
I/O-
6/IFIN2
14
I/O-5
/IFIN1
General-purpose
I/O ports/General-
purpose
counter
frequency
measurement
input
General-purpose
I/O
port
input
/output pins. Can be switched for use
as input pins to measure general
purpose counter frequencies. The
frequency measurement function has
such
uses
as
measuring
inter-
mediate frequencies (IF).
These pins feature built-in amps.
Data are input by capacitor coupling.
FM
IN
and AM
IN
operate at low
amplitude.
(note) Pins are set for input when
power is turned on.
V
DD
15
DO1
16
DO2/OT-4
Phase comparator
output
(General-
purpose
output
ports)
These pins are for phase comparator
tri-state output. DO1 and DO2 are
output in parallel.
V
DD
12
GND
9
V
DD
Power supply pins
Applies 5.0V
10%
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