DS8615 [NSC]
130/225 MHz Low Power Dual Modulus Prescalers; 二百二十五分之一百三十MHz的低功耗双模预分频器
| 型号： | DS8615 |
| 厂家： | 
National Semiconductor |
| 描述： | 130/225 MHz Low Power Dual Modulus Prescalers |
| 文件： | 总7页 (文件大小：121K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
July 1992
DS8615/DS8616 130/225 MHz
Low Power Dual Modulus Prescalers
General Description
The DS8615 series products are low power dual modulus
prescalers which divide by 32/33 and 40/41 respectively.
The modulus control (MC) input selects division by N when
The device can be used in phase-locked loop applications
such as FM radio or other communications bands to pre-
scale the input frequency down to a more usable level. A
digital frequency display system can also be derived sepa-
rately or in conjunction with a phase-locked loop, and it can
extend the useful range of many inexpensive frequency
counters to 225 MHz.
a
at a high TTL level and division by N
1 when at a low TTL
level. The clock inputs are buffered, providing 40/100
mVrms input sensitivity. The two outputs provide the user
the option to wire either a totem-pole or open-collector out-
put structure. Additionally, the user can wire a resistor be-
tween the two output pins to minimize edge transition emis-
sions. The outputs are designed to drive positive edge trig-
gered PLLs. These products can be operated from either an
Features
Y
Input frequency: 130 MHz (-4); 225 MHz (-2)
Y
Low power: 10 mA (-4, -2)
g
unregulated 5.5V to 13.5V source or regulated 5V 10%
source. Unregulated operation is obtained by connecting V
Y
Input sensitivity: 100 mVrms (-4); 40 mVrms (-2)
S
Y
Pin compatible with Motorola MC12015-16 prescalers
to the source with V
open. Regulated operation is ob-
to the supply
REG
Y
Unregulated/regulated power supply option
tained by connecting both V and V
S
source.
REG
Logic and Connection Diagrams
d
a
1
Generalized
N/N
TL/F/5240–1
Dual-In-Line Package
TL/F/5240–2
Top View
Order Number DS8615N or DS8616N (-4, -2)
See NS Package Number N08E
C
1995 National Semiconductor Corporation
TL/F/5240
RRD-B30M105/Printed in U. S. A.
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Modulus Control Input Voltage
Open-Collector Output Voltage
Operating Free Air Temperature Range
Storage Temperature Range
7V
7V
b
a
30 C to 70 C
§
65 C to 150 C
§
V , Unregulated Supply Voltage
S
15V
7V
b
a
§
§
V , Regulated Supply Voltage
REG
Recommended Operating Conditions
DS8615-4
DS8616-4
DS8615-2
DS8616-2
Units
Symbol
Parameter
Conditions
Min
Max
13.5
5.5
Min
Max
13.5
5.5
e
REG
V
V
Unregulated Supply Voltage
Regulated Supply Voltage
Toggle Frequency
V
V
V
Open
6.8
4.5
20
5.5
4.5
V
V
S
and V
Shorted
REG
MAX
S
REG
e
f
100 mVrms
130
300
225
300
MHz
mVrms
V/ms
mA
IN
V
V
Input Signal Amplitude
Slew Rate
100
20
40
20
IN
SLW
b
b
400
I
I
High Level Output Current
Low Level Output Current
400
OH
OL
2.0
2.0
mA
DC Electrical Characteristics (Notes 2 and 3)
DS8615-4
DS8616-4
DS8615-2
DS8616-2
Symbol
Parameter
Conditions
Units
Min
2.0
Max
Min
2.0
Max
e
e
Open
V
V
V
High Level MC Input
Voltage
V
V
13.5V, V
IH
S
REG
V
V
e
e
4.5V
Low Level MC Input
Voltage
V
S
IL
REG
0.8
0.8
e b
OH
High Level Output
Voltage
I
0.4 mA,
OH
b
b
2
V
2
V
V
REG
REG
Pins 2 and 3 Shorted
e
I
Open-Collector High
Level Output
Lower Output
5.5V
CEX
100
0.5
100
20
100
0.5
100
20
mA
V
e
e
V
Low Level Output
Voltage
V
REG
4.5V, I
OL
2 mA
OL
e
e
e
13.5V, V
REG
I
I
I
I
I
Max MC Input Current
V
V
Open,
2.7V
I
S
mA
mA
mA
mA
mA
7V
IH
e
e
High Level MC Input
Current
V
REG
4.5V, V
IH
IH
e
e
e
Low Level MC Input
Current
V
V
13.5V, V
0.4V
Open,
Open
IL
S
REG
REG
b
b
200
200
IL
e
e
Supply Current,
V
S
13.5V, V
S
10
10
Unregulated Mode
e
e
5.5V
Supply Current,
Regulated Mode
V
S
V
REG
REG
10
10
Note 1: ‘‘Absolute Maximum Ratings’’ are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the device
should be operated at these limits. The table of ‘‘Electrical Characteristics’’ provides conditions for actual device operation.
b
a
Note 2: Unless otherwise specified Min/Max limits apply across the 30 C to 70 C range.
§
§
Note 3: All current into device pins shown as positive, out of device pins as negative, all voltages referenced to ground unless otherwise noted. All values shown as
Max or Min on absolute value basis.
2
e
e b a
30 C to 70 C
g
5V 10%, T
AC Electrical Characteristics V
§
§
CC
A
Symbol
Parameter
Conditions
Min
Max
Units
t
Modulus Set-Up Time
(Notes 4 and 5)
DS8615, DS8616
MODULUS
65
ns
e
R
C
AC Input Resistance
Input Capacitance
V
V
100 MHz and 50 mVrms
100 MHz and 50 mVrms
1.0
3
kX
IN
IN
e
10
pF
IN
IN
Note 1: ‘‘Absolute Maximum Ratings’’ are those values beyond which the safety of the device cannot be guaranteed. Except for ‘‘Operating Temperature Range’’
they are not meant to imply that the devices should be operated at these limits. The table of ‘‘Electrical Characteristics’’ provides conditions for actual device
operation.
b
a
Note 2: Unless otherwise specified min/max limits apply across the 30 C to 70 C temperature range.
§
§
Note 3: All currents into device pins are shown as positive, out of device pins as negative, all voltages referenced to ground unless otherwise noted. All values
shown as max or min on absolute value basis.
e
Note 4: t
MODULUS
selection.
the period of time the modulus control level must be defined prior to the positive transition of the prescaler output to ensure proper modulus
Note 5: See Timing Diagrams.
Timing Diagram
TL/F/5240–3
The logical state of the modulus control input just prior to the output’s rising edge will determine the modulus ratio of the device
a
e
HI conditions.
immediately following that rising edge. The pulse width difference of N and N
1 operation occurs during the output
Typical Applications
TL/F/5240–4
TL/F/5240–5
Schematic Diagrams
TL/F/5240–7
TL/F/5240–8
TL/F/5240–6
3
Application Hints
OPERATING NOTES
the single ended mode, a capacitor of 0.001 mF (C2) should
be connected between the unused input and the ground
plane to provide a good high frequency bypass. The capaci-
tor should be made larger for lower frequencies.
The signal source is usually capacitively coupled to the in-
put. At higher frequencies a 0.001 mF input capacitor (C1) is
usually sufficient, with larger values used at the lower fre-
quencies. If the input signal is likely to be interrupted, it may
be desirable to connect a 100 kX resistor between one in-
put and ground to stabilize the device. In the single-ended
mode, it is preferable to connect the resistor to the unused
input. In the differential mode, the resistor can be connected
to either input. The addition of the 100 kX pulldown resistor
causes a loss of input sensitivity, but prevents circuit oscilla-
tions under no signal (open circuit) conditions. In addition, in
The input waveform may be sinusoidal, but below about
20 MHz the operation of the circuit becomes dependent on
the slew rate of the input rather than amplitude. A square
wave input with a slew rate of greater than 20 V/ms will
permit correct operation down to lower frequencies, provid-
ed the proper input coupling capacitor is provided.
For regulated mode operation connect V to V
to en-
sure proper operation (see Typical Application diagram).
S
REG
4
Physical Dimensions inches (millimeters)
Molded Dual-In-Line Package (M)
Order Number DS8614M-4, DS8615M-4, DS8616M-4 or DS8617M-4
NS Package Number M08A
5
Physical Dimensions inches (millimeters) (Continued)
Molded Dual-In-Line Package (N)
Order Number DS8614N, DS8615N, DS8616N or DS8617N (-4, -3, -2)
NS Package Number N08E
LIFE SUPPORT POLICY
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DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL
SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and whose
failure to perform, when properly used in accordance
with instructions for use provided in the labeling, can
be reasonably expected to result in a significant injury
to the user.
2. A critical component is any component of a life
support device or system whose failure to perform can
be reasonably expected to cause the failure of the life
support device or system, or to affect its safety or
effectiveness.
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