GEC SP8720BDG

ADVANCE INFORMATION
DS3650-1·2
SP8720
300MHz4
43/4
The SP8720 is an ECL two-modulus divider, with ECL10K
compatible outputs. It divides by 3 when either of the ECL control
inputs, PE1 or PE2, is in the high state and by 4 when both are low
(or open circuit). An AC coupled input of 600mVp-p is required.
CLOCK INPUT
1
16
INTERNAL BIAS DECOUPLING
2
15
NC
3
14
NC
NC
4
13
NC
VCC
5
12
VEE
NC
6
11
DO NOT CONNECT
NC
7
10
NC
OUTPUT
8
9
CONTROL  PE1
INPUTS 
 PE2
FEATURES
■ ECL Compatible Outputs
■ AC-Coupled Input (Internal Bias)
■ Control Inputs ECL III/10K Compatible
QUICK REFERENCE DATA
■ Supply Voltage: 25·2V
SP8720
OUTPUT
DG16
■ Power Consumption: 240mW
■ Temperature Range:
Fig. 1 Pin connections - top view
255°C to 1125°C (A Grade)
230°C to 170°C (B Grade)
ORDERING INFORMATION
ABSOLUTE MAXIMUM RATINGS
Supply voltage
Output current
Storage temperature range
Max. junction temperature
Max. clock input voltage
28V
20mA
265°C to 1150°C
1175°C
2·5V p-p
SP8720 A DG
SP8720 B DG
5962-90577 (SMD)
VCC (0V)
5
PE1
PE2
D1
2
Q1
D2
8
OUTPUT
3
CK
CLOCK INPUT
Q2
CK
1
16
INTERNAL BIAS
DECOUPLING
Fig. 2 Functional diagram
12
VEE
Q2
9
OUTPUT
SP8720
ELECTRICAL CHARACTERISTICS
Unless otherwise stated, the Electrical Characteristics are guaranteed over specified supply, frequency and temperature range
Supply voltage, VCC = 0V, VEE = 25·2V 6 0·25V
Temperature, TAMB = 255°C to 1125°C (A Grade), 230°C to 170°C (B Grade)
Value
Characteristic
Symbol
fMAX
fMIN
IEE
VOH
VOL
VINH
VINL
tp
ts
tr
Maximum frequency (sinewave input)
Minimum frequency (sinewave input)
Power supply current
Output high voltage
Output low voltage
PE input high voltage
PE input low voltage
Clock to output delay
Set-up time
Release time
Units
Min.
300
20·85
21·8
20·93
Conditions
Notes
Max.
40
65
20·7
21·5
21·62
6
2·5
3
Input = 400-800mV p-p
Input = 400-800mV p-p
VEE = 25·2V
VEE = 25·2V (25°C)
VEE = 25·2V (25°C)
VEE = 25·2V (25°C)
VEE = 25·2V (25°C)
MHz
MHz
mA
V
V
V
V
ns
ns
ns
5
5
5
6
3, 6
4, 6
NOTES
1. The temperature coefficients of VOH = 11·63mV/°C, VOL = 10·94mV/°C and of VIN = 11·22mV/°C.
2. The test configuration for dynamic testing is shown in Fig.6.
3. The set-up time ts is defined as the minimum time that can elapse between L→H transition of control input and the next L→H clock pulse transition
to ensure that the 43 mode is obtained.
4. The release time tr is defined as the minimum time that can elapse between H→L transition of control input and the next L→H clock pulse transition
to ensure that the 44 mode is obtained.
5. SP8720B tested at 25°C only.
6. Guaranteed but not tested.
TRUTH TABLE FOR
CONTROL INPUTS
CLOCK INPUT
tr
ts
PE INPUT
2
1
OUTPUT
2
2
PE1
PE2
Division ratio
L
H
L
H
L
L
H
H
4
3
3
3
Fig. 3 Timing diagram
INPUT AMPLITUDE (mV p-p)
2000
1600
TAMB = 255°C TO 1125°C
1200
800
* Tested as specified
GUARANTEED *
OPERATING
WINDOW
in table of Electrical
Characteristics
400
0
0
100
200
INPUT FREQUENCY (MHz)
300
Fig. 4 Typical input characteristic of SP8720A
2
400
SP8720
OPERATING NOTES
1. The clock input is biased internally and is coupled to the signal
source with a suitable capacitor. The input signal path is completed
by an input reference decoupling capacitor which is connected
from pin 16 to ground.
2. If no signal is present the device will self-oscillate. If this is
undesirable, it may be prevented by connecting a 15kΩ resistor
from the clock input (pin 1) to VEE. This will reduce the input
sensitivity by approximately 100mV.
3. The circuit will operate down to DC but slew rate must be better
than 100V/µs.
4. The Q and Q outputs are compatible with ECLII but can be
interfaced to ECL10K as shown in Fig. 7. There is an internal
circuit equivalent to a load of 2kΩ at each output.
5. The PE inputs are ECLIII/10K compatible and include 4·3kΩ
pulldown resistors. Unused inputs can therefore be left open.
6. The input impedance of the SP8720 varies as a function of
frequency, see Fig. 5.
7. All components should be suitable for the frequency in use.
j1
j 0.5
j2
j 0.2
j5
0
0.2
0.5
1
5
2
50
300
100
250
2j 0.2
200
2j 5
150
2j 2
2j 0.5
2j 1
Fig. 5 Typical input impedance. Test conditions: Supply Voltage = 25·2V,
Ambient Temperature = 25°C. Frequencies in MHz, impedances normalised to 50Ω.
1n
33
TO SAMPLING
SCOPE
5
1
INPUT FROM
GENERATOR
33
16
1n
8
DUT
9
450
450
100n
100n
OUTPUTS TO
SAMPLING
SCOPE
12
VEE = 25·2V
20
1n
Fig. 6 Test circuit
3
SP8720
ECL CONTROL INPUTS
0=4
1=3
PE1
PE2
2
3
5
1n
1
CLOCK
INPUT
4·3k
400
16
4·3k
8
DIVIDE BY
3/4
9
BIAS
47
1n
15k
2k
ECL10K
OUTPUT
2k
1·5k
12
VEE
1n
Fig. 7 Typical application circuit showing interfacing
4
SP8720
NOTES
5
SP8720
PACKAGE DETAILS
Dimensions are shown thus: mm (in).
1
PIN 1 REF
NOTCH
5·59/7·87
(0·220/0·310)
7·62 (0·3)
NOM CTRS
16
1·14/1·65
(0·045/0·065)
0·20/0·36
(0·008/0·014)
20·32 (0·800)
MAX
SEATING PLANE
5·08/(0·20)
MAX
0·36/0·58
(0·014/0·23)
0·51 (0·02) 3·18/4·06
MIN
(0·125/0·160)
16 LEADS AT 2·54 (0·10)
NOM. SPACING
NOTES
1. Controlling dimensions are inches.
2. This package outline diagram is for guidance
only. Please contact your GPS Customer
Service Centre for further information.
16-LEAD CERAMIC DIL – DG16
HEADQUARTERS OPERATIONS
GEC PLESSEY SEMICONDUCTORS
Cheney Manor, Swindon,
Wiltshire SN2 2QW, United Kingdom.
Tel: (0793) 518000
Fax: (0793) 518411
GEC PLESSEY SEMICONDUCTORS
P.O. Box 660017
1500 Green Hills Road,
Scotts Valley, CA95067-0017
United States of America.
Tel (408) 438 2900
Fax: (408) 438 5576
CUSTOMER SERVICE CENTRES
● FRANCE & BENELUX Les Ulis Cedex Tel: (1) 64 46 23 45 Fax : (1) 64 46 06 07
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● ITALY Milan Tel: (02) 66040867 Fax: (02) 66040993
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● NORTH AMERICA Scotts Valley, USA Tel: (408) 438 2900 Fax: (408) 438 7023.
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Swindon Tel: (0793) 518510 Fax : (0793) 518582
These are supported by Agents and Distributors in major countries world-wide.
© GEC Plessey Semiconductors 1994 Publication No. DS3650 Issue No. 1.2 March 1994
This publication is issued to provide information only which (unless agreed by the Company in writing) may not be used, applied or reproduced for any purpose nor form part of any order or contract nor to be regarded
as a representation relating to the products or services concerned. No warranty or guarantee express or implied is made regarding the capability, performance or suitability of any product or service. The Company
reserves the right to alter without prior knowledge the specification, design or price of any product or service. Information concerning possible methods of use is provided as a guide only and does not constitute
any guarantee that such methods of use will be satisfactory in a specific piece of equipment. It is the user's responsibility to fully determine the performance and suitability of any equipment using such information
and to ensure that any publication or data used is up to date and has not been superseded. These products are not suitable for use in any medical products whose failure to perform may result in significant injury
or death to the user. All products and materials are sold and services provided subject to the Company's conditions of sale, which are available on request.
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