SM5050A
NIPPON PRECISION CIRCUITS INC.
Single-output Clock Generator IC
OVERVIEW
The SM5050A is a single-output clock generator IC that generates standard high-frequency clocks derived
from a 20 to 40MHz crystal oscillator master clock. The high-frequency output stage uses optimized PLL cir-
cuits for low jitter output. The oscillator capacitors C
G
and C
D
are built-in, realizing a high-frequency output
oscillator by just the connection of a crystal. Two program inputs allows selection from 4 frequency multipli-
ers, making the SM5050A able to generate multi-standard frequency clock outputs.
FEATURES
s
s
PAD DIMENSIONS
(Unit: µm)
s
s
s
s
s
s
s
2.7 to 3.6V operating supply voltage
20 to 40MHz master clock frequency (fundamen-
tal)
Output frequency ranges
• 100 to 166.6MHz (V
DD
= V
DDQ
= 3.0 to 3.6V)
• 100 to 125MHz (V
DD
= V
DDQ
= 2.7 to 3.6V)
8mA output drive capability
Oscillator capacitors (C
G
, C
D
) and feedback resis-
tor (R
f
) built-in
100ps (typ) low jitter output (peak-to-peak)
2 program inputs for 4 selectable multiplier ratios
Standby function
Packaging
• Chip form (CF5050A)
• 8-pin VSOP package (SM5050AV)
P1
P0
(2160,1570)
VSS
VSSQ
Q
SA5050A
INHN
XT
(0,0)
VDDQ VDD
XTN
PINOUT
(Top view )
Chip size: 2.16
×
1.57mm
Chip thickness: 300 ± 30µm
Chip base: V
S S
level
PACKAGE DIMENSIONS
(Unit: m m )
P1
VSS
Q
VDD
1
2
3
4
8
7
6
5
P0
INHN
XT
XTN
4.4
± 0.2
6.4
±
0.3
0 to 10
0.575 typ
ORDERING INFORMATION
D e vice
CF5050A–1
SM5050AV
P ackag e
Chip form
3.1
±
0.3
1.15
± 0.05
+0
0.15
−0
.05
.1
0.10
0.22
± 0.1
0.1
± 0.05
8-pin V S O P
0.65
0.12
M
NIPPON PRECISION CIRCUITS—1
0.5
± 0.2
SM5050A
BLOCK DIAGRAM
VDD
VDDQ
XT
XTN
Oscillator
R-counter
Phase
Detector
Charge
Pump
LPF
VCO
Duty
Control
Circuit
Output
Buffer
Q
N-counter
P0
Control
Circuit
P1
INHN
VSS
VSSQ
PIN DESCRIPTION
SM5050AV
Number
1
2
3
4
5
6
7
8
Name
P1
VSS
VSSQ
Q
VDD
VDD
XTN
XT
INHN
P0
XTN
XT
INHN
P0
906
1524
1870
1870
1540
240
240
542
1015
1330
–
O
I
Ip
Ip
Supply
Cr ystal oscillator connection pins.
Cr ystal connected between XT and XTN.
Operating state control (inhibit).
When INHN is LOW , output is high impedance and PLL circuits stop.
Program input 0. Selects the output frequency multiplier ratio.
Q
VDDQ
290
290
540
920
569
240
–
O
–
Output circuit ground
Output (CMOS)
Output circuit supply
Name
X
P1
VSS
620
290
Y
1330
1132
Ip
–
Program input 1. Selects the output frequency multiplier ratio.
Ground
CF5050A
P ad dimensions [µm]
I/O
1
Description
1. Ip = input with built-in pull-up resistor.
NIPPON PRECISION CIRCUITS—2
SM5050A
OUTPUT FREQUENCY SETTINGS
Program inputs
Multiplier ratio
P0
LOW
LOW
HIGH
P1
LOW
HIGH
LOW
×
4
×
4.25
×
5
Master clock
frequency [MHz]
25.00
25.00
25.00
26.66
24.8832
26.66
Output frequency
[MHz]
100
106.25
125
133.3
155.52
166.6
3.0 to 3.6
2.7 to 3.6
Supply voltag e [V]
HIGH
HIGH
×
6.25
Note: The output frequency range is 100 to 166.6MHz. The master clock frequency can be adjusted to any value within the range 20 to 40MHz,
so the master clock frequency and multiplier should be selected such that the output frequency is within the output frequency range.
SPECIFICATIONS
Absolute Maximum Ratings
V
SS
= 0V
P arameter
Supply voltage range
Input voltage range
Output voltage range
Storage temperature range
Operating temperature range
Output current
Pow er dissipation
Symbol
V
DD
V
IN
V
OUT
CF5050A
T
stg
T
opr
I
O U T
P
D
SM5050AV
SM5050AV
Condition
Rating
−0.5
to 6.0
−0.5
to V
D D
+ 0.5
−0.5
to V
D D
+ 0.5
−65
to 150
−55
to 125
−40
to 85
25
150
Unit
V
V
V
°C
°C
°C
mA
mW
Recommended Operating Conditions
V
SS
= 0V, f
OUT
= 100 to 166.6MHz, C
L
= 15pF
Rating
P arameter
Symbol
Condition
min
Operating supply voltage
Input voltage
Operating temperature
V
DD
V
IN
T
opr
f
O U T
≤
1 2 5 M H z
f
O U T
≤
166.6MHz
2.7
3.0
V
SS
−20
typ
–
–
–
–
max
3.6
V
3.6
V
DD
80
V
°C
Unit
NIPPON PRECISION CIRCUITS—3
SM5050A
DC Characteristics
V
DD
= 2.7 to 3.6V, V
SS
= 0V, Ta =
−20
to 80°C unless otherwise noted
Rating
P arameter
Q HIGH-level output voltage
Q L OW -level output voltage
Q output leakage current
INHN HIGH-level input voltage
P0, P1 HIGH-level input voltage
I N H N L OW -level input voltage
P0, P1 LOW -level input voltage
Symbol
V
OH
V
OL
I
Z
V
IH1
V
IH2
V
IL1
V
IL2
25MHz cr ystal, measurement circuit 1,
load circuit 1, INHN = open, C
L
= 15pF,
P0 = HIGH, P1 = LOW , V
D D
= 3.0V
25MHz cr ystal, measurement circuit 1,
load circuit 1, INHN = open, C
L
= 15pF,
P0 = HIGH, P1 = LOW
INHN = V
S S
, measurement circuit 1
V
D D
= 3V, measurement circuit 2
V
D D
= 3V, Ta = 25°C , f = 30MHz
Measurement circuit 3
Design values
15.98
18.44
20.90
pF
Condition
min
V
D D
= 2.7V, I
O H
= 8mA
V
D D
= 2.7V, I
O L
= 8mA
Measurement circuit 4,
INHN = V
S S
V
OH
= V
DD
V
OL
= V
SS
2.2
–
–
–
0.7V
D D
0.9V
D D
–
–
–
typ
–
–
–
–
–
–
–
–
23
max
–
0.4
10
µA
10
–
–
0.3V
D D
0.1V
D D
–
mA
–
–
0.3
10
–
100
15.98
–
–
–
–
−240
300
18.44
42
40
6
200
–
900
20.90
µA
M
Ω
k
Ω
Ω
k
Ω
pF
V
V
V
V
V
V
Unit
Current consumption
I
D D
Standby current
INHN, P0, P1 input pull-up
resistance
Negative resistance
Feedback resistance
Internal capacitance
I
S T
R
UP1
R
UP2
−R
L
R
f
C
G
C
D
NIPPON PRECISION CIRCUITS—4
SM5050A
Switching Characteristics
V
DD
= 2.7 to 3.6V, V
SS
= 0V, Ta =
−20
to 80°C unless otherwise noted
Rating
P arameter
Symbol
Condition
min
Output rise time
Output fall time
t
r
t
f
0.2V
D D
→
0.8V
D D
, measurement
circuit 1, load circuit 1, C
L
= 15pF
0.8V
D D
→
0.2V
D D
, measurement
circuit 1, load circuit 1, C
L
= 15pF
V
D D
= 3V, Ta = 25°C , measurement
circuit 1, load circuit 1, C
L
= 15pF,
f
≤
166.6MHz
V
D D
= 3V, Ta = 25°C , measurement
circuit 1, load circuit 1, C
L
= 15pF
V
D D
= 3V, Ta = 25°C , measurement
circuit 1, load circuit 1, C
L
= 15pF
Measurement circuit 1
Measurement circuit 1
V
D D
= 2.7V
V
D D
= 3.0V
V
D D
= 3V, Ta = 25°C , 25MHz crystal,
P0 = HIGH, P1 = LOW , measurement
circuit 1, load circuit 1,C
L
= 15pF,
peak-to-peak
–
–
typ
1
1
max
2.5
2.5
ns
ns
Unit
Output duty cycle
Duty
40
–
60
%
Output disable delay time
1
Star tup time
2 ,3
Oscillator frequency
Output frequency
t
P L Z
t
S Z L
f
f
O U T
–
–
20
100
100
–
1
–
–
–
100
–
40
125
ns
ms
MHz
MHz
166.6
Output clock jitter
3
Jitter
–
100
–
ps
1. Time from when INHN goes LOW until Q output goes high impedance.
2. Time from when either INHN goes LOW to HIGH or supply voltage V
D D
= 3.0V until normal signal output.
3. Measured values using NPC characteristics standard evaluation board and standard crystal.
NPC STANDARD CRYSTAL DATA
Cb
f (MHz)
25
27
R (Ω)
4.368
7.421
L (mH)
1.885
2.402
Ca (fF)
21.52
14.48
Cb (pF)
4.793
4.097
L
Ca
R
NIPPON PRECISION CIRCUITS—5
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