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THIS DOCUMENT IS FOR MAINTENANCE PURPOSES ONLY AND IS NOT RECOMMENDED FOR NEW DESIGNS
ADVANCE INFORMATION
DS3675-1*2
SP8790
4 60MHz44 (2-MODULUS EXTENDER)
The SP8790 is a divide-by-four counter designed for use with 2-modulus dividers. It increases the minimum division ratio of the 2-modulus divider while retaining the same difference in division ratio. The device is suitable for use in low power frequency synthesis interfacing to CMOS or TTL.
CLOCK INPUT CLOCK INPUT 78 CONTROL INPUT 6 54 VEE NC 3 COUNTER OUTPUT 1 2 CONTROL OUTPUT VCC
FEATURES
s Very Low Power s Control Input and Counter Output will Interface Directly
to TTL or CMOS s Interfaces to GPS SP8000 Series Programmable 2-Modulus Dividers QUICK REFERENCE DATA s Supply Voltage: 5*0V
CM8
Fig. 1 Pin connections - bottom view
s Power Consumption: 40mW s Temperature Range: 255C to 1125C (A Grade)
230C to 170C (B Grade) ABSOLUTE MAXIMUM RATINGS
Supply voltage Open collector output voltage Storage temperature range Max. junction temperature Max. clock input voltage Output sink current 8V 12V 265C to 1150C 1175C 2*5V p-p 10mA
ORDERING INFORMATION
SP8790 A CM SP8790 B CM
CONTROL INPUT 6 CONTROL OUTPUT 2
VCC 1
D
Q
D
Q OUTPUT STAGE 3 OPEN COLLECTOR COUNTER OUTPUT
D Q CK CK
D Q CK CK
8 CLOCK INPUT
7 CLOCK INPUT
5 VEE (0V)
NOTE: NEGATIVE GOING OUTPUT SHOULD CLOCK FOLLOWING STAGE
Fig. 2 Functional diagram
SP8790
ELECTRICAL CHARACTERISTICS
Unless otherwise stated, the Electrical Characteristics are guaranteed over specified supply, frequency and temperature range Supply voltage, VCC = 5V 0*25V, VEE = 0V Temperature, TAMB = 255C to 1125C (A Grade), 230C to 170C (B Grade) Value Characteristic Maximum frequency (sinewave input) Power supply current Control input high voltage Control input low voltage Output high voltage (pin 3) Output low voltage (pins 3) Output high voltage (pin 2) Output low voltage (pin 2) Clock to counter output 2ve going delay Clock to counter output 1ve going delay Clock to control output 2ve going delay Clock to control output 1ve going delay Control input to control output 2ve going delay Control input to control output 1ve going delay Symbol fMAX ICC VINH VINL VOH VOL VOH VOL tpHL tpLH tpHL tpLH tpHL tpLH Min. Max. 60 3*5 0 9 4*27 3*28 11 10 1*5 0*4 4*5 3*7 25 40 15 26 12 16 Units MHz mA V V V V V V ns ns ns ns ns ns Conditions Tested as a controller, see Fig. 4 Notes 2 2 2 2 2 2
Pin 3 via 1*6k to110V Pin 3 via 1*6k to110V VCC = 5*2V (25C) VCC = 5*2V (25C)
10k pull-down on control output 10k pull-down on control output 10k pull-down on control output 10k pull-down on control output
3 3 3, 4 3, 4 3, 4 3, 4
NOTES 1. The test configuration for dynamic testing is shown in Fig.4. 2. Tested at low and high temperatures only. 3. Guaranteed but not tested. 4. The propagation delays stated are with the device controlling the SP8695, which has internal 10k pull-down resistors on its PE inputs. These propagation delays will be reduced when the device is used with the SP8643/47 and SP8740 series of 2-modulus dividers, which have internal 4*3k pull-downs. Refer to relevant data sheet/s.
CLOCK INPUT
CONTROL INPUT
COUNTER OUTPUT (PIN 3)
CONTROL OUTPUT (PIN 2)
N.B: IF CONTROL INPUT = `1' THEN CONTROL OUTPUT = `1'
Fig. 3 Timing diagram
OPERATING NOTES
1. The device will normally be driven by capacitively coupling the inputs to the outputs of a 2-modulus divider, as shown in Figs. 4 and 5. The maximum frequency of the device when used as a controller is limited by the internal delays to 60MHz. However, when used as a 44 prescaler, it will operate at frequencies in excess of 80MHz, the maximum frequency being limited by saturation of the output stage. 2. The device is normally driven from very fast edges of a 2modulus divider, in which case there is no input slew rate problem. 3. The control input is TTL/CMOS compatible. 4. The counter output (pin 3) interfaces to TTL/CMOS by the addition of a pull-up resistor. For interfacing to CMOS, the output can be connected with a pull-up resistor to a supply which must not exceed 12V. 5. When used as a controller the device will self-oscillate in the absence of an input signal; this can be prevented by connecting a 47k resistor from pin 7 to ground, as shown in Fig. 5. 6. The control output, which includes an internal 16k pulldown resistor, is ECL compatible and will interface directly to ECL 2-modulus dividers such as the GPS SP8600 and SP8700 series as shown in Figs. 4 and 5.
2
SP8790
VCC
VCC
CONTROL OUTPUT 5 100n fIN SIGNAL SOURCE 400mV p-p 300MHz 16 2 8 100n 2 8 7 100n 1 3
1*6k 450 100n OUTPUT TO MONITOR SCOPE
SP8740 45/6
1 12
9
SP8790
5
6
100n
CONTROL INPUT HIGH = 420 LOW = 421
Fig. 4 Test circuit
CONTROL OUTPUT PE2 1n 1 16 68k 1n 3 8 100n 2 CLOCK CLOCK 100n 47k CONTROL INPUT HIGH = 440 LOW = 441 8 7
SP8695 410/11
9
SP8790
6
3
CMOS/TTL OUTPUT
Fig. 5 Typical interfacing to suppress oscillation with no input signal
3
SP8790
PACKAGE DETAILS
Dimensions are shown thus: mm (in).
4*19/4*70 (0*165/0*185) 12*70/14*28 (0*500/0*570) 812 7 3 6 54 45
4*83/5*33 P.C.D. (0*190/0*210)
8*63/9*39 8*00/8*51 (0*315/0*335) (0*340/0*370)
0*41/0*53 (0*016/0*021)
0*25/1*02 (0*010/0*040)
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.
8-LEAD METAL CAN - CM8
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. DS3675 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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