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d a t a sh eet product speci?cation supersedes data of september 1993 file under integrated circuits, ic06 1998 jul 08 integrated circuits 74hc/hct4059 programmable divide-by-n counter for a complete data sheet, please also download: the ic06 74hc/hct/hcu/hcmos logic family specifications the ic06 74hc/hct/hcu/hcmos logic package information the ic06 74hc/hct/hcu/hcmos logic package outlines
1998 jul 08 2 philips semiconductors product speci?cation programmable divide-by-n counter 74hc/hct4059 features synchronous programmable divide-by-n counter presettable down counter fully static operation mode select control of initial decade counting function (divide-by-10, 8, 5, 4 and 2) master preset initialization latchable output easily cascadable with other counters four operating modes: timer divider-by-n divide-by-10 000 master preset output capability: standard i cc category: msi general description the 74hc/hct4059 are high-speed si-gate cmos devices and are pin compatible with the 4059 of the 4000b series. they are specified in compliance with jedec standard no. 7a. the 74hc/hct4059 are divide-by-n counters which can be programmed to divide an input frequency by any number (n) from 3 to 15 999. there are four operating modes, timer, divide-by-n, divide-by-10 000 and master preset, which are defined by the mode select inputs (k a to k c ) and the latch enable input (le) as shown in the function table. the complete counter consists of a first counting stage, an intermediate counting stage and a fifth counting stage. the first counter stage consists of four independent flip-flops. depending on the divide-by-mode, at least one flip-flop is placed at the input of the intermediate stage (the remaining flip-flops are placed at the fifth stage with a place value of thousands). the intermediate stage consists of three cascaded decade counters, each containing four flip-flops. all flip-flops can be preset to a desired state by means of the jam inputs (j 1 to j 16 ), during which the clock input (cp) will cause all stages to count from n to zero. the zero-detect circuit will then cause all stages to return to the jam count, during which an output pulse is generated. in the timer mode, after an output pulse is generated, the output pulse remains high until the latch input (le) goes low. the counter will advance, even if le is high and the output is latched in the high state. in the divide-by-n mode, a clock cycle wide pulse is generated with a frequency rate equal to the input frequency divided by n. the function of the mode select and jam inputs are illustrated in the following examples. in the divide-by-2 mode, only one flip-flop is needed in the first counting section. therefore the last (5th) counting section has three flip-flops that can be preset to a maximum count of seven with a place value of thousands. this counting mode is selected when k a to k c are set high. in this case input j 1 is used to preset the first counting section and j 2 to j 4 are used to preset the last (5th) counting section. if the divide-by-10 mode is desired for the first section, k a and k b are set high and k c is set low. the jam inputs j 1 to j 4 are used to preset the first counting section (there is no last counting section). the intermediate counting section consists of three cascaded bcd decade (divide-by-10) counters, presettable by means of the jam inputs j 5 to j 16 . the preset of the counter to a desired divide-by-n is achieved as follows: n = (mode (1) ) (1 000 x decade 5 preset + 100 x decade 4 preset + 10 x decade 3 preset + 1 x decade 2 preset) + decade 1 preset to calculate preset values for any n count, divide the n count by the selected mode. the resultant is the corresponding preset value of the 5th to the 2nd decade with the remainder being equal to the 1st decade value; preset value = n/mode. if n = 8 479, and the selected mode = 5, the preset value = 8 479/5 = 1 695 with a remainder of 4, thus the jam inputs must be set as shown in table 1. to verify the results, use the given equation: n = 5 (1 000 1 + 100 6 + 10 9 + 1 5) + 4 n = 8 479. if n = 12 382 and the selected mode = 8, the preset value = 12 382/8 = 1 547 with a remainder of 6, thus the jam inputs must be set as shown in table 2. to verify: n = 8 (1 000 1 + 100 5 + 10 4 + 1 7) + 6 n = 12 382. (1) mode = first counting section divider (10, 8, 5, 4 or 2).
1998 jul 08 3 philips semiconductors product speci?cation programmable divide-by-n counter 74hc/hct4059 if n = 8 479 and the selected mode = 10, the preset value = 8 479/10 with a remainder of 9, thus the jam inputs must be set as shown in table 3. to verify: n = 10 (1 000 0 + 100 8 + 10 4 + 1 7) + 9 n = 8 479. the three decades of the intermediate counting section can be preset to a binary 15 instead of a bcd 9. in this case the first cycle of a counter consists of 15 count pulses, the next cycles consisting of 10 counting pulses. thus the place value of the three decades are still 1, 10 and 100. for example, in the divide-by-8 mode, the number from which the intermediate counting section begins to count-down can be preset to: 3rd decade: 1 500 2nd decade: 150 1st decade: 15 the last counting section can be preset to a maximum of 1, with a place value of 1 000. the first counting section can be preset to a maximum of 7. to calculate n: n = 8 (1 000 1 + 100 15 + 10 15 + 1 15) + 7 n = 21 327. 21 327 is the maximum possible count in the divide-by-8 mode. the highest count of the various modes is shown in the function table, in the column entitled binary counter range. the mode select inputs permit, when used with decimal programming, a non-bcd least significant digit. for example, the channel spacing in a radio is 12.5 khz, it may be convenient to program the counter in decimal steps of 100 khz subdivided into 8 steps of 12.5 khz controlled by the least significant digit. also frequency synthesizer channel separations of 10, 12.5, 20, 25 and 50 parts can be chosen by the mode select inputs. this is called fractional extension. a similar extension called half channel offset can be obtained in modes 2, 4, 6 and 8, if the jam inputs are switched between zero and 1, 2, 3 and 4 respectfully. this is illustrated in fig.5. this feature is used primarily in cases where radio channels are allocated according to the following formula: channel frequency = channel spacing x (n + 0.5) n is an integer. control inputs k b and k c can be used to initiate and lock the counter in the master preset mode. in this condition the flip-flops in the counter are preset in accordance with the jam inputs and the counter remains in that mode as long as k b and k c both remain low. the counter begins to count down from the preset state when a counting mode other than the master preset mode is selected. whenever the master preset mode is used, control signals k b =k c = low must be applied for at least 2 full clock pulses. after the master preset mode inputs have been changed to one of the counting modes, the next positive-going clock transition changes an internal flip-flop so that the count-down begins on the second positive-going clock transition. thus, after a master preset mode, there is always one extra count before the output goes high. figure 6 illustrates the operation of the counter in the divide-by-8 mode starting from the preset state 3. if the master preset mode is started two clock cycles or less before an output pulse, the output pulse will appear at the correct moment. when the output pulse appears and the master preset mode is not selected, the counter is preset according to the states of the jam inputs. when k a , k b , k c and le are low, the counter operates in the preset inhibit mode, during which the counter divides at a fixed rate of 10 000, independent of the state of the jam inputs. however, the first cycle length after leaving the master preset mode is determined by the jam inputs. when k a , k b and k c are low and input le = high, the counter operates in the normal divide-by-10 mode, however, without the latch operation at the output. this device is particularly advantageous in digital frequency synthesizer circuits (vhf, uhf, fm, am etc.) for communication systems, where programmable divide-by-n counters are an integral part of the synthesizer phase-locked-loop sub-system. the 74hc/hct4059 can also be used to perform the synthesizer fixed divide-by-n counting function, as well as general purpose counting for instrumentation functions such as totalizers, production counters and time out timers. schmitt-trigger action at the clock input makes the circuit highly tolerant to slower clock rise and fall times.
1998 jul 08 4 philips semiconductors product speci?cation programmable divide-by-n counter 74hc/hct4059 quick reference data gnd = 0 v; t amb =25 c; t r =t f = 6 ns notes 1. c pd is used to determine the dynamic power dissipation (p d in m w): p d =c pd v cc 2 f i +? (c l v cc 2 f o ) where: f i = input frequency in mhz f o = output frequency in mhz ? (c l v cc 2 f o ) = sum of outputs c l = output load capacitance in pf v cc = supply voltage in v 2. for hc the condition is v i = gnd to v cc for hct the condition is v i = gnd to v cc - 1.5 v ordering information symbol parameter conditions typical unit hc hct t phl / t plh propagation delay cp to q c l = 15 pf; v cc =5 v1820ns f max maximum clock frequency 40 40 mhz c i input capacitance 3.5 3.5 pf c pd power dissipation capacitance per package notes 1 and 2 30 32 pf type number package name description version 74HC4059n3; 74hct4059n3 dip24 plastic dual in-line package; 24 leads (300 mil) sot222-1 74HC4059n; 74hct4059n dip24 plastic dual in-line package; 24 leads (600 mil) sot101-1 74HC4059d; 74hct4059d so24 plastic small outline package; 24 leads; body width 7.5 mm sot137-1
1998 jul 08 5 philips semiconductors product speci?cation programmable divide-by-n counter 74hc/hct4059 pin description pin no. symbol name and function 1 cp clock input (low-to-high, edge-triggered) 2 le latch enable (active high) 3, 4, 5, 6, 22, 21, 20, 19, 18, 17, 16, 15, 10, 9, 8, 7 j 1 to j 16 programmable jam inputs (bcd) 12 gnd ground (0 v) 14, 13, 11 k a to k c mode select inputs 23 q divide-by-n output 24 v cc positive supply voltage fig.1 pin configuration. fig.2 logic symbol. fig.3 iec logic symbol.
1998 jul 08 6 philips semiconductors product speci?cation programmable divide-by-n counter 74hc/hct4059 fig.4 functional block diagram. applications frequency synthesizer, ideally suited for use with pc74hc/hct4046a, pc74hc/hct7046a and pc74hc/hct9046a (plls) fixed or programmable frequency division time out timer
1998 jul 08 7 philips semiconductors product speci?cation programmable divide-by-n counter 74hc/hct4059 function table note 1. it is recommended that the device is in the master preset mode (k b =k c = logic 0) in order to correctly initialize the device prior to start-up. an example of a suitable external circuit is shown in fig.14. h = high voltage level l = low voltage level x = dont care table 1 table 2 table 3 latch enable input mode select inputs first counting section decade 1 last counting section decade 5 counter range operation le k a k b k c mode max preset state jam inputs used divided by max. preset state jam inputs used bcd max. binary max. hhhh21j 1 87j 2 j 3 j 4 15 999 17 331 timer mode hlhh43j 1 j 2 43j 3 j 4 15 999 18 663 hhlh54j 1 j 2 j 3 21j 4 9 999 13 329 hllh87j 1 j 2 j 3 21j 4 15 999 21 327 hhhl109j 1 j 2 j 3 j 4 10 - 9 999 16 659 lhhh21j 1 87j 2 j 3 j 4 15 999 17 331 divide-by-n mode llhh43j 1 j 2 43j 3 j 4 15 999 18 663 lhlh54j 1 j 2 j 3 21j 4 9 999 13 329 lllh87j 1 j 2 j 3 21j 4 15 999 21 327 lhhl109j 1 j 2 j 3 j 4 10 - 9 999 16 659 hlhl109j 1 j 2 j 3 j 4 10 - 9 999 16 659 l l h l preset inhibited preset inhibited ?xed 10 000 - divide-by-10 000 mode x x l l master preset master preset -- master preset mode 41 5 9 6 j 1 j 2 j 3 j 4 j 5 j 6 j 7 j 8 j 9 j 10 j 11 j 12 j 13 j 14 j 15 j 16 llhhhlhlhl lhlhhl 61 7 4 5 j 1 j 2 j 3 j 4 j 5 j 6 j 7 j 8 j 9 j 10 j 11 j 12 j 13 j 14 j 15 j 16 l hhh hhh lll hl hl hl 9748 j 1 j 2 j 3 j 4 j 5 j 6 j 7 j 8 j 9 j 10 j 11 j 12 j 13 j 14 j 15 j 16 h ll h hhh lll hl ll lh
1998 jul 08 8 philips semiconductors product speci?cation programmable divide-by-n counter 74hc/hct4059 fig.5 half channel offset. fig.6 total count of 3.
1998 jul 08 9 philips semiconductors product speci?cation programmable divide-by-n counter 74hc/hct4059 dc characteristic for 74hc for the dc characteristics see 74hc/hct/hcu/hcmos logic family specifications . output capability: standard i cc category: msi ac characteristics for 74hc gnd = 0 v; t r =t f = 6 ns; c l = 50 pf note 1. from master preset mode to any other mode. symbol parameter t amb ( c) unit test conditions 74hc v cc (v) waveforms + 25 - 40 to + 85 - 40 to + 125 min. typ. max. min. max. min. max. t phl / t plh propagation delay cp to q 58 200 250 300 ns 2.0 fig.7 21 40 50 60 4.5 17 34 43 51 6.0 t phl / t plh propagation delay le to q 50 175 220 265 ns 2.0 fig.8 18 35 44 53 4.5 14 30 37 45 6.0 t thl / t tlh output transition time 19 75 95 110 ns 2.0 fig.7 7 15 19 22 4.5 6 13 16 19 6.0 t w clock pulse width cp 90 7 115 135 ns 2.0 fig.7 18 6 23 27 4.5 15 5 90 23 6.0 t rem removal time k b , k c to cp 75 19 95 110 ns 2.0 fig.9; note 1 15 7 19 22 4.5 13 6 16 19 6.0 f max maximum clock pulse frequency 4.2 12 3.4 2.8 mhz 2.0 fig.7 21 36 17 14 4.5 25 43 20 17 6.0
1998 jul 08 10 philips semiconductors product speci?cation programmable divide-by-n counter 74hc/hct4059 dc characteristics for 74hct for the dc characteristics see 74hc/hct/hcu/hcmos logic family specifications . output capability: standard i cc category: msi note to hct types the value of additional quiescent supply current ( d i cc ) for a unit load of 1 is given in the family specifications. to determine d i cc per input, multiply this value by the unit load coefficient shown in the table below. ac characteristics for 74hct gnd = 0 v; t r =t f = 6 ns; c l = 50 pf note 1. from master preset mode to any other mode. input unit load coefficient cp 0.65 le 0.65 j n 0.50 k a 1.00 k b 1.50 k c 0.85 symbol parameter t amb ( c) unit test conditions 74hct v cc (v) waveforms + 25 - 40 to + 85 - 40 to + 125 min. typ. max. min. max. min. max. t phl / t plh propagation delay cp to q 24 46 58 69 ns 4.5 fig.7 t phl / t plh propagation delay le to q 24 46 58 69 ns 4.5 fig.8 t thl / t tlh output transition time 7 15 19 22 ns 4.5 fig.7 t w clock pulse width cp 20 7 25 30 ns 4.5 fig.7 t rem removal time k b , k c to cp 15 7 9 22 ns 4.5 fig.9; note 1 f max maximum clock pulse frequency 21 36 17 14 mhz 4.5 fig.7
1998 jul 08 11 philips semiconductors product speci?cation programmable divide-by-n counter 74hc/hct4059 ac waveforms fig.7 waveforms showing the clock (cp) to output (q) propagation delays, the clock pulse width, the output transition times and the maximum clock frequency. (1) hc: v m = 50%; v i = gnd to v cc . hct: v m = 1.3 v; v i = gnd to 3 v. fig.8 waveforms showing the le input to q output propagation delay. (1) hc: v m = 50%; v i = gnd to v cc . hct: v m = 1.3 v; v i = gnd to 3 v. fig.9 waveforms showing the k b or k c removal times, when the operating mode is switched from master preset to any other mode. (1) hc: v m = 50%; v i = gnd to v cc . hct: v m = 1.3 v; v i = gnd to 3 v.
1998 jul 08 12 philips semiconductors product speci?cation programmable divide-by-n counter 74hc/hct4059 application information fig.10 example showing the application of the pc74hc/hct4059 in a phase-locked-loop (pll) for a fm band synthesizer. calculating the minimum and maximum divide-by-n values: output frequency range = 87.6 to 103.8 mhz (ccir band 2) channel spacing frequency (f c ) = 300 khz division factor prescaler (k) = 10 reference frequency (f r ) = maximum divide-by-n value = minimum divide-by-n value = fixed divide-by-n value = application of the 4059 as divide-by-n counter allows programming of the channel spacing (shown in equations as 300 khz). a channel in the ccir band 2 is selected by the divide-by-n counter as follows: channel = n - 290 f c k --- - 300 10 --------- - 30 khz == 103.8 mhz 300 khz ---------------------------- - 346 = 87.6 mhz 300 khz ------------------------- 292 = 3mhz 30 khz ------------------ 100 = figure 11 shows a bcd switch compatible arrangement suitable for divide-by-5 and divide-by-8 modes, which can be adapted (with minimal changes) to the other divide-by-modes. in order to be able to preset to any number from 3 to 256 000, while preserving the bcd switch compatible character of the jam inputs, a rather complex cascading scheme is necessary because the 4059 can never be preset to count less than 3. logic circuitry is required to detect a condition where one of the numbers to be preset in the 4059 is < 3. in order to simplify the detection logic, only that condition is detected where the jam inputs to terminals 6, 7 and 9 would be low during one count. if such a condition is detected, and if at least 1 is expected to be jammed into the msb counter, the detection logic removes one from the number to be jammed into the msb counter (with a place value of 2 000 times the divide-by-mode) and jams the same 2 000 into the 4059 by forcing pins 6, 7 and 9 high. the general circuit in fig.11 can be simplified considerably if the range of the cascaded counters do not start at a very low value. figure 12 shows an arrangement in the divide-by-4 mode, where the counting range extends in a bcd switch compatible manner from 99 003 to 114 999.
1998 jul 08 13 philips semiconductors product speci?cation programmable divide-by-n counter 74hc/hct4059 the arrangement shown in fig.12 is easy to follow; once during every cycle the programmed digits are jammed in (15 616 in this example) and then a round number of 11 000 is jammed in, nine times in succession, by forcing the jam inputs via and/or gates. numbers larger than the extended counter range can also be produced by cascading the pc74hc/hct4059 with some other counting devices. figure 13 shows such an arrangement where only one fixed divide-by number is desired. the dual flip-flop wired to produce a divide-by-3 count can be replaced by other counters such as the 190, 191, 192, 193, 4017, 4510 and 4516. in fig.13 the divide-by-n sub-system is preset once to a number which represents the least significant digits of the divide-by number (15 690 in the example shown in fig.13). the sub-system is then preset twice to a round number (8 000 in the example shown in fig.13) and multiplied by the number of the divide-by mode (2 in the example shown in fig.13). to verify: 15 690 + 2 8 000 2 = 47 690. it is important that the second counting device has an output that is high or low during only one of its counting states.
1998 jul 08 14 philips semiconductors product speci?cation programmable divide-by-n counter 74hc/hct4059 fig.11 bcd switch compatible divide-by-n system suitable for divide-by-5 and divide-by-8 mode. divides by any number from 3 to 256 000. each and gate is 1/4 of pc74hc/hct08. each or gate is 1/3 of pc74hc/hct4075. each nor gate is 1/2 of pc74hc/hct4002. each inverter is 1/6 of pc74hc/hct04.
1998 jul 08 15 philips semiconductors product speci?cation programmable divide-by-n counter 74hc/hct4059 fig.12 dividing-by any number from 99 003 to 114 999 (in this example n = 114 616). fig.13 division by 47 690 in divide-by-2 mode. fig.14 external circuit for master preset at start-up. (1) (2) it is assumed that the f cp starts directly after the power-on. any additional delay in starting f cp must be added to the rc time. rc 1 0.2 f cp hz () ------------------------------------- - 3
1998 jul 08 16 philips semiconductors product speci?cation programmable divide-by-n counter 74hc/hct4059 package outlines unit a max. 1 2 b 1 cd e e m h l references outline version european projection issue date iec jedec eiaj mm inches dimensions (millimetre dimensions are derived from the original inch dimensions) sot222-1 95-03-11 a min. a max. b z max. w m e e 1 1.63 1.14 0.56 0.43 0.36 0.25 31.9 31.5 6.73 6.48 3.51 3.05 0.25 2.54 7.62 8.13 7.62 10.03 7.62 2.05 4.70 0.38 3.94 0.064 0.045 0.022 0.017 0.014 0.010 1.256 1.240 0.265 0.255 0.138 0.120 0.01 0.100 0.300 0.32 0.30 0.395 0.300 0.081 0.185 0.015 0.155 ms-001af m h c (e ) 1 m e a l seating plane a 1 w m b 1 e d a 2 z 24 1 13 12 b e 0 5 10 mm scale note 1. plastic or metal protrusions of 0.01 inches maximum per side are not included. pin 1 index (1) (1) (1) dip24: plastic dual in-line package; 24 leads (300 mil) sot222-1
1998 jul 08 17 philips semiconductors product speci?cation programmable divide-by-n counter 74hc/hct4059 unit a max. 1 2 b 1 cd e e m h l references outline version european projection issue date iec jedec eiaj mm inches dimensions (inch dimensions are derived from the original mm dimensions) sot101-1 92-11-17 95-01-23 a min. a max. b w m e e 1 1.7 1.3 0.53 0.38 0.32 0.23 32.0 31.4 14.1 13.7 3.9 3.4 0.25 2.54 15.24 15.80 15.24 17.15 15.90 2.2 5.1 0.51 4.0 0.066 0.051 0.021 0.015 0.013 0.009 1.26 1.24 0.56 0.54 0.15 0.13 0.01 0.10 0.60 0.62 0.60 0.68 0.63 0.087 0.20 0.020 0.16 051g02 mo-015ad m h c (e ) 1 m e a l seating plane a 1 w m b 1 e d a 2 z 24 1 13 12 b e pin 1 index 0 5 10 mm scale note 1. plastic or metal protrusions of 0.25 mm maximum per side are not included. z max. (1) (1) (1) dip24: plastic dual in-line package; 24 leads (600 mil) sot101-1
1998 jul 08 18 philips semiconductors product speci?cation programmable divide-by-n counter 74hc/hct4059 unit a max. a 1 a 2 a 3 b p cd (1) e (1) (1) eh e ll p q z y w v q references outline version european projection issue date iec jedec eiaj mm inches 2.65 0.30 0.10 2.45 2.25 0.49 0.36 0.32 0.23 15.6 15.2 7.6 7.4 1.27 10.65 10.00 1.1 1.0 0.9 0.4 8 0 o o 0.25 0.1 dimensions (inch dimensions are derived from the original mm dimensions) note 1. plastic or metal protrusions of 0.15 mm maximum per side are not included. 1.1 0.4 sot137-1 x 12 24 w m q a a 1 a 2 b p d h e l p q detail x e z c l v m a 13 (a ) 3 a y 0.25 075e05 ms-013ad pin 1 index 0.10 0.012 0.004 0.096 0.089 0.019 0.014 0.013 0.009 0.61 0.60 0.30 0.29 0.050 1.4 0.055 0.419 0.394 0.043 0.039 0.035 0.016 0.01 0.25 0.01 0.004 0.043 0.016 0.01 e 1 0 5 10 mm scale so24: plastic small outline package; 24 leads; body width 7.5 mm sot137-1 95-01-24 97-05-22
1998 jul 08 19 philips semiconductors product speci?cation programmable divide-by-n counter 74hc/hct4059 soldering introduction there is no soldering method that is ideal for all ic packages. wave soldering is often preferred when through-hole and surface mounted components are mixed on one printed-circuit board. however, wave soldering is not always suitable for surface mounted ics, or for printed-circuits with high population densities. in these situations reflow soldering is often used. this text gives a very brief insight to a complex technology. a more in-depth account of soldering ics can be found in our data handbook ic26; integrated circuit packages (order code 9398 652 90011). dip s oldering by dipping or by wave the maximum permissible temperature of the solder is 260 c; solder at this temperature must not be in contact with the joint for more than 5 seconds. the total contact time of successive solder waves must not exceed 5 seconds. the device may be mounted up to the seating plane, but the temperature of the plastic body must not exceed the specified maximum storage temperature (t stg max ). if the printed-circuit board has been pre-heated, forced cooling may be necessary immediately after soldering to keep the temperature within the permissible limit. r epairing soldered joints apply a low voltage soldering iron (less than 24 v) to the lead(s) of the package, below the seating plane or not more than 2 mm above it. if the temperature of the soldering iron bit is less than 300 c it may remain in contact for up to 10 seconds. if the bit temperature is between 300 and 400 c, contact may be up to 5 seconds. so r eflow soldering reflow soldering techniques are suitable for all so packages. reflow soldering requires solder paste (a suspension of fine solder particles, flux and binding agent) to be applied to the printed-circuit board by screen printing, stencilling or pressure-syringe dispensing before package placement. several techniques exist for reflowing; for example, thermal conduction by heated belt. dwell times vary between 50 and 300 seconds depending on heating method. typical reflow temperatures range from 215 to 250 c. preheating is necessary to dry the paste and evaporate the binding agent. preheating duration: 45 minutes at 45 c. w ave soldering wave soldering techniques can be used for all so packages if the following conditions are observed: a double-wave (a turbulent wave with high upward pressure followed by a smooth laminar wave) soldering technique should be used. the longitudinal axis of the package footprint must be parallel to the solder flow. the package footprint must incorporate solder thieves at the downstream end. during placement and before soldering, the package must be fixed with a droplet of adhesive. the adhesive can be applied by screen printing, pin transfer or syringe dispensing. the package can be soldered after the adhesive is cured. maximum permissible solder temperature is 260 c, and maximum duration of package immersion in solder is 10 seconds, if cooled to less than 150 c within 6 seconds. typical dwell time is 4 seconds at 250 c. a mildly-activated flux will eliminate the need for removal of corrosive residues in most applications. r epairing soldered joints fix the component by first soldering two diagonally- opposite end leads. use only a low voltage soldering iron (less than 24 v) applied to the flat part of the lead. contact time must be limited to 10 seconds at up to 300 c. when using a dedicated tool, all other leads can be soldered in one operation within 2 to 5 seconds between 270 and 320 c.
1998 jul 08 20 philips semiconductors product speci?cation programmable divide-by-n counter 74hc/hct4059 definitions life support applications these products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. philips customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify philips for any damages resulting from such improper use or sale. data sheet status objective speci?cation this data sheet contains target or goal speci?cations for product development. preliminary speci?cation this data sheet contains preliminary data; supplementary data may be published later. product speci?cation this data sheet contains ?nal product speci?cations. limiting values limiting values given are in accordance with the absolute maximum rating system (iec 134). stress above one or more of the limiting values may cause permanent damage to the device. these are stress ratings only and operation of the device at these or at any other conditions above those given in the characteristics sections of the speci?cation is not implied. exposure to limiting values for extended periods may affect device reliability. application information where application information is given, it is advisory and does not form part of the speci?cation.

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