IMISG508APB [ETC]
Miscellaneous Clock Generator ; 其他时钟发生器\n
| 型号： | IMISG508APB |
| 厂家： | 
ETC |
| 描述： | Miscellaneous Clock Generator
|
| 文件： | 总7页 (文件大小：79K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
IMISG508
REDUCED EMI CLOCK CHIP
CMOS LSI
May 1996
SPECTRUM SPREAD CLOCK GENERATOR
PRODUCT FEATURES
PRODUCT DESCRIPTION
þ
Generates CPU Clock Signals for Microprocessor
Systems
The IMISG508 is a spectrum spread clock generator
specially designed for personal computers, laser
printers and other digital systems. IMISG508 uses a
patented concept to generate popular clock frequencies
that are intentionally boradbanded to reduce
electromagnetic interference. IMISG508 attenuates the
radiated emission amplitudes from products associated
with either the clock harmonics or any signals derived
from the clock signals nominally 10 dB and could
significantly reduce the cost of complying with the
regulatory requirements.
þ
þ
þ
þ
Reduces Measured EMI by 10 dB nominal
4V to 6V Operating Supply Range
Supports CPUs from all major manufacturers
Wide Range of Selectable Output Frequencies
including 40, 30, 25, and 16.7 MHz.
þ
Single, Low Cost Crystal used as Reference
Frequency
PRCLK is the broadbanded output and can be
programmed by the PRCLK Frequency Selection Table
on page 2. A single, low cost external crystal is
required as reference frequency for the synthesizer.
Output modulation function can be turned off with the
SSON pin. Several power down modes add the
flexibility to operate the device in a completely static
mode to reduce standby currents and simplify system
board tests.
þ
þ
þ
þ
Glitch-Free Switching
50% Duty Cycle
Power Down Mode for Low Power consumption
TTL or CMOS Compatible Outputs with 6 mA Drive
Capability
CONNECTION DIAGRAM
þ
þ
Low, Short- and Long-Term Jitter
1
2
3
4
5
6
7
8
TS
16
15
14
13
12
11
10
9
VDD
OSCin
OSCout
VSS
MPSEL
AVDD
S0
VDD
MPCLK
VSS
PRCLK
AVSS
LF1
16 Pin PDIP and 16 Pin SOIC (300 mil Body)
Package Options
BLOCK DIAGRAM
3
SSON
S1
14
44.2
MHz
/4 or /12
REF
MPCLK
2
5
APPLICATIONS
MPSEL
The IMISG508 eliminates the need for multiple
oscillators and generates the CPU clock signals for
personal computers, laser printers and other digital
systems. Supports CPUs from all major manufacturers.
IMISG508 can be used with laptop or notebook
computers to save power by running the system slower
than normal CPU speeds or completely disabling the
clocks in standby mode.
10
LF
S0
S1
TS
7
8
SPECTRUM
SPREAD
CLOCK GEN
12
PRCLK
/2
16
9
SSON
INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.
MILPITAS, CA 95035 TEL: 408-263-6300 FAX 408-263-6571
Rev. 1.0
Page 1 of 7
IMISG508
REDUCED EMI CLOCK CHIP
CMOS LSI
May 1996
SPECTRUM SPREAD CLOCK GENERATOR
PIN DESCRIPTION
SSON - This pin controls the spectrum spread function.
OSCin, OSCout - These pins form an on-chip
reference oscillator when connected to terminals of an
external 44.2 MHz third overtone parallel resonant
crystal. OSCin may also serve as an input for an
externally generated CMOS level or AC coupled
reference signal.
When low, PRCLK is modulated. When high, spreading
is turned off. This pin has an internal pull-up.
MPSEL - Controls MPCLK output frequency selections.
Table 2 shows the selected frequencies for MPCLK.
This input has an internal pull-up.
S0, and S1 - Frequency select inputs. These inputs
control the PRCLK frequency selection. S0-S1 inputs
control the CPU clock frequencies. All these inputs
have internal pull-downs.
MPCLK - This is a nonmodulated output. This output
can be programmed to be 3.7 MHz or 11.06 MHz. The
selection of these frequencies are controlled by the
MPSEL pin shown in Table 1.
PRCLK - Output from the spectrum spread clock
generator. Frequency selection is shown in Table 1.
VSS - Circuit ground.
VDD - Positive power supply.
AVSS - Analog circuit ground.
AVDD - Analog positive power supply.
Table 1 shows the output frequency selection
conditions.
TS - Controls power down and Tri-State Mode
selection. When high, S1 input controls the mode
selection as shown in Table 1 and Table 2. When low,
the device operates in normal mode. This pin has an
internal pull-down.
LF
2k
R2
C2
330 pf
C1
2200 pf
LF1 - This is the control output for the clock generator,
It is a single-ended, tri-state output. Component
connections are shown in Figure 1.
PRCLK FREQUENCY TABLE
MPCLK FREQUENCY SELECTION
INPUTS
OUTPUT
INPUTS
OUTPUT
TS
S1
S0
PRCLK
TS
0
0
1
1
MPSEL
S1
X
X
0
0
1
S0
X
X
0
1
0
MPCLK
3.7 MHz
11.06 MHz
0; Power Down
1; Power Down
TEST
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
16.7 MHz
40 MHz
25
30 MHz
0
1
X
X
X
X
0; Power Down
1; Power Down
TEST
1
1
1
1
Hi-Z
TABLE 2: When Power down address is selected, the
VCO is turned off and the device goes to standby
mode. Phase detector is in tri-state mode.
Hi-Z
TABLE 1: When Power Down address is selected, the
VCO is turned off and the device goes to standby
mode. Phase detector is in tri-state mode. The Table is
based on using 44.2 MHz crystal. Output can be scaled
own using lower frequency crystals, see page 6.
INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.
MILPITAS, CA 95035 TEL: 408-263-6300 FAX 408-263-6571
Page 2 of 7
Rev. 1.0
IMISG508
REDUCED EMI CLOCK CHIP
CMOS LSI
May 1996
SPECTRUM SPREAD CLOCK GENERATOR
MAXIMUM RATINGS
This device contains circuitry to protect the inputs
against damage due to high static voltages or electric
Voltage Relative to VSS:
Voltage Relative to VDD:
Storage Temperature:
Ambient Temperature:
Recommended Operating Range:
-03V to 6V
field; however, precautions should be taken to avoid
0.3V
application of any voltage higher than the maximum
-65°C to 150°C
rated voltages to this circuit. For proper operation, Vin
and Vout should be constrained to the range:
0°C to 70°C
4.5 - 5.5V
VSS < (Vin or Vout) < VDD
Unused inputs must always be tied to an appropriate
logic voltage level (either VSS or VDD).
ELECTRICAL CHARACTERISTICS
Characteristic
Symbol
Min
Typ
Max
Units
Vdc
Vdc
uA
Input Low Voltage
VIL
VIH
-
2.0
-
-
-
0.8
Input High Voltage
-
10/100
0.4
-
Input Low Current with Pull-up/Pull-down
IIH/IIL
VOL
VOH
IOZ
-
-
-
Vdc
Vdc
uA
Output Low Voltage IOL = 6mA
2.5
-
-
Output High Voltage IOH = 6mA
Tri-State leakage Current
-
10
Static Supply Current
Dynamic Supply Current
Short Circuit Current
IDD
-
-
250
30
uA
ICC
-
25
-
mA
mA
ISC
25
-
VDD = 5V + 10%, TA = 0°C to 70°C
INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.
MILPITAS, CA 95035 TEL: 408-263-6300 FAX 408-263-6571
Rev. 1.0
Page 3 of 7
IMISG508
REDUCED EMI CLOCK CHIP
CMOS LSI
May 1996
SPECTRUM SPREAD CLOCK GENERATOR
SWITCHING CHARACTERISTICS
Characteristic
Symbol
Min
Typ
Max
Units
Output Rise and Fall Time Measured at 10% - 90% of
VDD
tTLH,tTHL
-
-
5
ns
Output Rise and Fall Time Measured at 0.8V - 2.0V
Output Duty Cycles
tTLH,tTHL
TsymF1
tj1s
-
-
-
-
-
-
3
45/55
2
ns
%
Jitter One Sigma
% of Fout
VDD = 5V + 10%, TA = 0°C, CL = 15 pF
OSCILLATOR CHARACTERISTICS
Characteristic
Symbol
gm
Min
Typ
Max
180
800
18
Units
millimhos
ohms
pf
Conditions
Transconductance
Output Impedance
Input Capacitance
Output Capacitance
DC Bias Voltage
Start-up Time
20
80
@44.2 MHz
Zo
-
8
3
1.5
-
200
@ 44.2 MHz
Ci
13
-
Co
6
9
pf
-
VB
VDD/2
3.5
2
Volt
ms
-
ts
-
-
-
-
@ VDD = 4.5V
Duty Cycle
TsymF1
ICLKr
ICLKf
-
45/55
20
%
-
-
-
Input Rise Time OSCin
Input Fall Time OSCout
-
ns
-
20
ns
VCO CHARACTERISTICS
Characteristic
VCO Gain
Symbol
Min
35
Typ
55
Max
65
Units
Conditions
MHz/volt
DF/DV Measured with VCO Control at 2V - 3V
K0
Kd
Phase Detector Gain
100
145
200
uA
-
INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.
MILPITAS, CA 95035 TEL: 408-263-6300 FAX 408-263-6571
Page 4 of 7
Rev. 1.0
IMISG508
REDUCED EMI CLOCK CHIP
CMOS LSI
May 1996
SPECTRUM SPREAD CLOCK GENERATOR
EXTERNAL CONNECTIONS
VCC
L1
DIGITAL GND PLANE
ANALOG GND PLANE
DVDD
AVDD
DIGITAL POWER PLANE
C11
10uF
1.5 uH
R1
ANALOG POWER PLANE
DVDD
10 Ohms
C10
22uF
C3
XTAL
10pF
SG508
1
44.2 MHz
16
15
14
13
12
11
10
9
VDD
XIN
TEST
VDD
MPCLK
VSS
PRCLK
AVSS
LF1
DVDD
C6
.1uF
JP5
1
C9
.1uF
2
3
4
5
6
7
8
C5
XOUT
VSS
MPSEL
AVDD
S1
C4
10pF
.033uF
2
1.2uH
HEADER
L2
C7 10pF
S0
SSON
R2
2K
C8
.1uF
AVDD
C1
330 pf
JP1
MPSEL
C2
2200pF
S0 JP2
JP3
S1
JP4
TEST
DVDD
NOTE1: KEEP C3, C4, C5, C6 CLOSE TO THEIR PINS (4, 11, 13, 10, 9 RESPECTIVELY).
IMISG508
PACKAGE DRAWING AND DIMENSIONS
INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.
MILPITAS, CA 95035 TEL: 408-263-6300 FAX 408-263-6571
Page 5 of 7
Rev. 1.0
IMISG508
REDUCED EMI CLOCK CHIP
CMOS LSI
May 1996
SPECTRUM SPREAD CLOCK GENERATOR
16 PIN SOIC OUTLINE DIMENSIONS
C
INCHES
MILLIMETERS
L
SYMBOL
MIN
NOM
MAX
0.104
MIN
2.46
NOM
2.56
MAX
H
E
0.097
0.101
2.64
0.38
2.39
0.48
0.32
10.46
7.59
A
A1
A2
B
0.0020
0.090
0.014
0.0091
.399
0.009
0.092
0.016
0.010
.407
0.0015
0.111
0.019
0.0125
.412
0.060
2.29
0.35
0.23
10.13
7.24
0.22
2.34
0.41
D
a
0.25
C
D
E
A2
A
10.34
7.52
0.285
0.296
0.050 BSC
0.406
5°
0.299
A1
e
1.27 BSC
10.31
5°
B
e
0.400
0°
0.410
10°
10.16
0°
10.41
10°
H
a
SOIC PACKAGE (300 mil)
0.024
0.032
0.040
0.61
0.81
1.02
L
16-PIN PLASTIC DIP DIMENSIONS
INCHES
MILLIMETERS
C
SYMBOL
MIN
0.150
0.015
0.016
0.056
0.046
0.008
0.748
0.300
0.240
0.335
NOM
MAX
0.170
-
MIN
3.81
0.381
0.40
1.47
1.17
0.20
19.00
7.62
6.096
8.51
NOM
4.06
-
MAX
4.318
-
E2
a
0.160
-
A
A1
B
0.018
0.059
0.049
0.010
0.750
0.312
0.252
0.345
0.100 BSC
0.230
7°
0.020
0.062
0.052
0.012
0.752
0.325
0.260
0.355
0.45
1.52
1.24
0.25
19.05
7.924
6.49
8.76
2.54 BSC
3.30
7°
0.50
1.57
1.32
0.30
19.10
8.255
6.604
9.01
E
E1
B1
B2
C
D
B2
Q2
D
A1
Q
A
E
E1
E2
e1
L
B1
B
L
e1
S
0.25
0°
0.135
15°
3.175
0°
3.429
15°
a
0.059
0.128
0.073
0.060
0.130
0.075
0.061
0.132
0.077
1.50
3.25
1.85
1.53
3.30
1.90
1.55
3.35
1.95
Q1
Q2
S
INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.
MILPITAS, CA 95035 TEL: 408-263-6300 FAX 408-263-6571
Page 6 of 7
Rev. 1.0
IMISG508
REDUCED EMI CLOCK CHIP
CMOS LSI
May 1996
SPECTRUM SPREAD CLOCK GENERATOR
ORDERING INFORMATION
Part Number
IMISG508APB
IMISG508AXB
Package Type
16 Pin Plastic Dip
16 Pin SOIC
Production Flow
Commercial, 0°C to + 70°C
Commercial, 0°C to +70°C
Note:
The ordering part number is formed by a combination of device number, device revision, package style, and
screening as shown below.
Marking: Example:
IMI
SG508APB
Date Code, Lot #
IMISG508APB
Flow
B = Commercial, 0°C to + 70°C
Package
P = Plastic Dip
X = Small Outline
Revision
IMI Device Number
INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.
MILPITAS, CA 95035 TEL: 408-263-6300 FAX 408-263-6571
Page 7 of 7
Rev. 1.0
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