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ADVANCE INFORMATION
DS3650-1*2
SP8720
300MHz43/4 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 CONTROL PE1 INPUTS PE2 NC VCC NC NC OUTPUT
1 2 3 4 5 6 7 8 16 15 14 13 12 11 10
INTERNAL BIAS DECOUPLING NC NC NC VEE DO NOT CONNECT NC OUTPUT
FEATURES s ECL Compatible Outputs
s AC-Coupled Input (Internal Bias) s Control Inputs ECL III/10K Compatible
QUICK REFERENCE DATA s Supply Voltage: 25*2V
SP8720
9
s Power Consumption: 240mW s Temperature Range:
255C to 1125C (A Grade) 230C to 170C (B Grade)
DG16
Fig. 1 Pin connections - top view
ABSOLUTE MAXIMUM RATINGS
Supply voltage Output current Storage temperature range Max. junction temperature Max. clock input voltage 28V 20mA 265C to 1150C 1175C 2*5V p-p
ORDERING INFORMATION
SP8720 A DG SP8720 B DG 5962-90577 (SMD)
VCC (0V) 5
PE1 PE2
2 3
D1
Q1
D2
Q2 Q2
8
OUTPUT
9
CK CLOCK INPUT 1
CK
OUTPUT
16 INTERNAL BIAS DECOUPLING
12 VEE
Fig. 2 Functional diagram
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 = 255C to 1125C (A Grade), 230C to 170C (B Grade) Value Characteristic Symbol fMAX fMIN IEE VOH VOL VINH VINL tp ts tr Units Min. 300 40 65 20*7 21*5 21*62 6 2*5 3 Max. MHz MHz mA V V V V ns ns ns Input = 400-800mV p-p Input = 400-800mV p-p VEE = 25*2V VEE = 25*2V (25C) VEE = 25*2V (25C) VEE = 25*2V (25C) VEE = 25*2V (25C) 5 5 5 Conditions Notes
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
20*85 21*8 20*93
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 LH transition of control input and the next LH 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 HL transition of control input and the next LH clock pulse transition to ensure that the 44 mode is obtained. 5. SP8720B tested at 25C only. 6. Guaranteed but not tested.
CLOCK INPUT
TRUTH TABLE FOR CONTROL INPUTS
tr ts
PE1 L H L H
PE2 L L H H
Division ratio 4 3 3 3
PE INPUT
2 OUTPUT 2
1 2
Fig. 3 Timing diagram
2000
INPUT AMPLITUDE (mV p-p)
1600 TAMB = 255C TO 1125C 1200
800
GUARANTEED * OPERATING WINDOW
* Tested as specified
in table of Electrical Characteristics
400
0
0
100
200 INPUT FREQUENCY (MHz)
300
400
Fig. 4 Typical input characteristic of SP8720A
2
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 15k 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/s. 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 2k at each output. 5. The PE inputs are ECLIII/10K compatible and include 4*3k 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
2
5
50 300 100 2j 0.2 250 200 150 2j 5
2j 2 2j 0.5 2j 1
Fig. 5 Typical input impedance. Test conditions: Supply Voltage = 25*2V, Ambient Temperature = 25C. Frequencies in MHz, impedances normalised to 50.
1n INPUT FROM GENERATOR 33 TO SAMPLING SCOPE 33 1 16 1n 20
5 8
450 450
100n 100n OUTPUTS TO SAMPLING SCOPE
DUT
12
9
VEE = 25*2V 1n
Fig. 6 Test circuit
3
SP8720
ECL CONTROL INPUTS 0=4 1=3
PE1 1n CLOCK INPUT 5 1 4*3k 400 2
PE2 3
4*3k
8
DIVIDE BY 3/4
BIAS 9 47 ECL10K OUTPUT 1*5k 12 VEE 1n
16 1n 15k
2k
2k
Fig. 7 Typical application circuit showing interfacing
4
SP8720
NOTES
5
SP8720
PACKAGE DETAILS
Dimensions are shown thus: mm (in).
1 5*59/7*87 (0*220/0*310) 16 0*20/0*36 (0*008/0*014) PIN 1 REF NOTCH 7*62 (0*3) NOM CTRS
1*14/1*65 (0*045/0*065) 20*32 (0*800) MAX
SEATING PLANE
5*08/(0*20) MAX
0*51 (0*02) 3*18/4*06 MIN (0*125/0*160)
0*36/0*58 (0*014/0*23)
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 q FRANCE & BENELUX Les Ulis Cedex Tel: (1) 64 46 23 45 Fax : (1) 64 46 06 07 q GERMANY Munich Tel: (089) 3609 06-0 Fax : (089) 3609 06-55 q ITALY Milan Tel: (02) 66040867 Fax: (02) 66040993 q JAPAN Tokyo Tel: (3) 5276-5501 Fax: (3) 5276-5510 q NORTH AMERICA Scotts Valley, USA Tel: (408) 438 2900 Fax: (408) 438 7023. q SOUTH EAST ASIA Singapore Tel: (65) 3827708 Fax: (65) 3828872 q SWEDEN Stockholm Tel: 46 8 702 97 70 Fax: 46 8 640 47 36 q UK, EIRE, DENMARK, FINLAND & NORWAY Swindon Tel: (0793) 518510 Fax : (0793) 518582 These are supported by Agents and Distributors in major countries world-wide. (c) 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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