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this document is for maintenance purposes only and is not recommended for new designs
ds3675-12 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. features n very low power n control input and counter output will interface directly to ttl or cmos n interfaces to gps sp8000 series programmable 2-modulus dividers quick reference data n supply voltage: 50v n power consumption: 40mw n temperature range: 2 55 c to 1 125 c (a grade) 2 30 c to 1 70 c (b grade) SP8790 60mhz 4 4 4 4 4 4 (2-modulus extender) 1 2 6 7 3 5 8 4 v ee clock input control output clock input v cc nc control input counter output fig. 1 pin connections - bottom view absolute maximum ratings supply voltage open collector output voltage storage temperature range max. junction temperature max. clock input voltage output sink current ordering information SP8790 a cm SP8790 b cm cm8 fig. 2 functional diagram 2 v cc control output clock input v ee (0v) open collector counter output 1 3 5 ck ck q q d ck ck q q d output stage 8 7 6 clock input control input note: negative going output should clock following stage d d 8v 12v 2 65 c to 1 150 c 1 175 c 25v p-p 10ma advance information
2 SP8790 11 10 15 04 45 37 25 40 15 26 12 16 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 2 ve going delay clock to counter output 1 ve going delay clock to control output 2 ve going delay clock to control output 1 ve going delay control input to control output 2 ve going delay control input to control output 1 ve going delay electrical characteristics unless otherwise stated, the electrical characteristics are guaranteed over specified supply, frequency and temperature range supply voltage, v cc = 5v 025v, v ee = 0v temperature, t amb = 2 55 c to 1 125 c (a grade), 2 30 c to 1 70 c (b grade) characteristic conditions 2 2 2 2 2 2 3 3 3, 4 3, 4 3, 4 3, 4 notes tested as a controller, see fig. 4 pin 3 via 16k w to 1 10v pin 3 via 16k w to 1 10v v cc = 52v (25 c) v cc = 52v (25 c) 10k w pull-down on control output 10k w pull-down on control output 10k w pull-down on control output 10k w pull-down on control output f max i cc v inh v inl v oh v ol v oh v ol t phl t plh t phl t plh t phl t plh symbol units mhz ma v v v v v v ns ns ns ns ns ns min. max. 60 35 0 9 427 328 value 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 w 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 ha ve internal 43k w 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 4 4 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 2- modulus 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 w resistor from pin 7 to ground, as shown in fig. 5. 6. the control output, which includes an internal 16k w pull- down 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.
3 SP8790 sp8740 4 5/6 output to monitor scope v cc 5 2 12 16 100n 1 f in signal source 400mv p-p 300mhz 100n 450 100n SP8790 control output control input high = 4 20 low = 4 21 v cc 1 16k 8 9 100n 100n 8 7 2 3 6 5 sp8695 4 10/11 3 1 1n 16 1n control output 8 9 100n 100n 68k pe2 clock cmos/ttl output SP8790 control input high = 4 40 low = 4 41 8 7 2 3 6 clock 47k fig. 4 test circuit fig. 5 typical interfacing to suppress oscillation with no input signal
4 SP8790 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 l france & benelux les ulis cedex tel: (1) 64 46 23 45 fax : (1) 64 46 06 07 l germany munich tel: (089) 3609 06-0 fax : (089) 3609 06-55 l italy milan tel: (02) 66040867 fax: (02) 66040993 l japan tokyo tel: (3) 5276-5501 fax: (3) 5276-5510 l north america scotts valley, usa tel: (408) 438 2900 fax: (408) 438 7023. l south east asia singapore tel: (65) 3827708 fax: (65) 3828872 l sweden stockholm tel: 46 8 702 97 70 fax: 46 8 640 47 36 l uk, eire, denmark, finland & norway 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. 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 regard ing 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, w hich are available on request. package details dimensions are shown thus: mm (in). 483/533 p.c.d. (0190/0210) 45 041/053 (0016/0021) 1270/1428 (0500/0570) 419/470 (0165/0185) 800/851 (0315/0335) 863/939 (0340/0370) 025/102 (0010/0040) 1 2 3 4 5 6 7 8 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
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