ppg38f doc #97007 data delay devices, inc. 1 1/15/97 3 mt. prospect ave. clifton, nj 07013 8-bit programmable pulse generator (series ppg38f) features packages digitally programmable in 256 steps monotonic pulse-width-vs-address variation rising edge triggered two separate outputs: inverting & non-inverting precise and stable pulse width input & outputs fully ttl interfaced & buffered 10 t 2 l fan-out capability fits standard 40-pin dip socket auto- insertable functional description the ppg38f-series device is a 8-bit digitally programmable pulse generator. the width, pw a , depends on the address code (a7-a0) according to the following formula: pw a = pw 0 + t inc * a where a is the address code, t inc is the incremental pulse width of the device, and pw 0 is the inherent pulse width of the device. the incremental width is specified by the dash number of the device and can range from 0.5ns through 400ns, inclusively. reset is held low during normal operation. when it is brought high, out and out/ are forced into low and high states, respectively, and the unit is ready for the next trigger input. the address is not latched and must remain asserted while the output pulse is active. series specifications programmed pulse width tolerance: 5% or 2ns, whichever is greater inherent width (pw 0 ): 20ns typical inherent delay (t to ): 10ns 2ns operating temperature: 0 to 70 c supply voltage v cc : 5vdc 5% supply current: i cc = 80ma typical 1997 data delay devices data delay devices, inc. 3 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 trig n/c out gnd n/c n/c res gnd n/c n/c n/c gnd n/c n/c n/c gnd a7 n/c n/c gnd vcc out/ n/c n/c vcc a0 a1 a2 vcc a3 a4 a5 vcc n/c n/c vcc n/c a6 n/c n/c ppg38f-xx dip ppg38f-xxc5 gull-wing ppg38f-xxm military dip ppg38f-xxmc5 military gull-wing pin descriptions trig trigger input out non-inverted output out/ inverted output a0-a7 address bits res reset vcc +5 volts gnd ground dash number specifications part number incremental width per step ( ns) total width change ( ns) ppg38f-.5 .5 .3 127.5 6.4 ppg38f-1 1 .5 255 12.8 ppg38f-2 2 .5 510 25.5 ppg38f-5 5 1.5 1,275 63.8 ppg38f-10 10 2.0 2,550 127.5 ppg38f-20 20 2.0 5,100 255.0 ppg38f-50 50 2.5 12,750 637.5 ppg38f-100 100 5.0 25,500 1275 ppg38f-200 200 10.0 51,000 2550 ppg38f-400 400 20.0 102,000 5100 note: any dash number between .5 and 400 not shown is also available.
ppg38f doc #97007 data delay devices, inc. 2 1/15/97 tel: 201-773-2299 fax: 201-773-9672 http://www.datadelay.com application notes device timing the timing definitions and restrictions for the ppg38f are shown in figure 1. the unit is activated by a rising edge on the trig input. after a time, t to (called the inherent delay), the rising edge of the pulse appears at out. the duration of the pulse is given by the above equation. for the duration of the pulse, the device ignores subsequent triggers. once the falling edge of the pulse has appeared at out, an additional time, t otr , is required before the device can respond to the next trigger. at power-up, the state of the ppg38f is unknown. consequently, after power is applied, the unit may not respond to input triggers for a time equal to the maximum pulse width, pw t . after this time, the unit will function properly. if your application requires that the device function immediately, issue a quick reset at power-up. power supply bypassing the ppg38f relies on a stable power supply to produce repeatable pulses within the stated tolerances. a 0.1uf capacitor from vcc to gnd, located as close as possible to each vcc pin, is recommended. a wide vcc trace should connect all vcc pins externally, and a clean ground plane should be used. increment tolerances please note that the increment tolerances listed represent a design goal. although most increments will fall within tolerance, they are not guaranteed throughout the address range of the unit. monotonicity is, however, guaranteed over all addresses. ` t oax t rts t tw t to pw a a7-a0 res trig out out/ figure 1: timing diagram a i a i+1 t skew t ats t ro t otr t tw t rw
ppg38f doc #97007 data delay devices, inc. 3 1/15/97 3 mt. prospect ave. clifton, nj 07013 device specifications table 1: ac characteristics parameter symbol min typ max units total programmable pulse width pw t 255 t inc inherent pulse width pw 0 15.0 20.0 27.0 ns trigger to output delay t to 8.0 10.0 12.0 ns reset to output delay t ro 17.0 ns output skew t skew 1.5 ns trigger pulse width t tw 5.0 ns reset pulse width t rw 10.0 ns reset to trigger setup time t rts 9.0 ns address to trigger setup time t ats 6.0 ns output low to address change t oax 0.0 ns output to trigger recovery time t otr 10.0 ns table 2: absolute maximum ratings parameter symbol min max units notes dc supply voltage v cc -0.3 7.0 v input pin voltage v in -0.3 v dd +0.3 v storage temperature t strg -55 150 c lead temperature t lead 300 c 10 sec table 3: dc electrical characteristics (0c to 70c, 4.75v to 5.25v) parameter symbol min typ max units notes high level output voltage v oh 2.5 3.4 v v cc = min, i oh = max v ih = min, v il = max low level output voltage v ol 0.35 0.5 v v cc = min, i ol = max v ih = min, v il = max high level output current i oh -1.0 ma low level output current i ol 20.0 ma high level input voltage v ih 2.0 v low level input voltage v il 0.8 v input clamp voltage v ik -1.2 v v cc = min, i i = i ik input current at maximum input voltage i ihh 0.1 ma v cc = max, v i = 7.0v high level input current i ih 20 m a v cc = max, v i = 2.7v low level input current i il -0.6 ma v cc = max, v i = 0.5v short-circuit output current i os -60 -150 ma v cc = max output high fan-out 25 unit output low fan-out 12.5 load
ppg38f doc #97007 data delay devices, inc. 4 1/15/97 tel: 201-773-2299 fax: 201-773-9672 http://www.datadelay.com package dimensions 2.100 max. 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 .280 max. .015 typ. .070 max. .018 typ. .580 max. .650 max. .010 .002 lead material: nickel-iron alloy 42 tin plate 20 19 18 17 24 23 22 21 29 30 31 32 33 34 35 25 26 27 28 36 37 38 39 40 .100 typ. dip (ppg38f-xx, ppg38f-xxm) 2.080 .020 .882 .005 .020 typ. .040 typ. .100 .090 1.100 .280 max. .590 max. .010 .002 .050 .010 .710 .005 .007 .005 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 gull-wing (ppg38f-xxc5, ppg38f-xxmc5)
ppg38f doc #97007 data delay devices, inc. 5 1/15/97 3 mt. prospect ave. clifton, nj 07013 delay line automated testing test conditions input: output: ambient temperature: 25 o c 3 o c load: 1 fast-ttl gate supply voltage ( vcc): 5.0v 0.1v c load : 5pf 10% input pulse: high = 3.0v 0.1v threshold: 1.5v (rising & falling) low = 0.0v 0.1v source impedance: 50 w max. rise/fall time: 3.0 ns max. (measured between 0.6v and 2.4v ) pulse width: pw in = 10ns period: per in = 2 x max. pulse width note: the above conditions are for test on ly and do not in any way restrict the operation of the device. out out trig in ref trig test setup device under test (dut) time interval counter pulse generator computer system printer in timing diagram for testing pw a per in pw in t rise t fall 0.6v 0.6v 1.5v 1.5v 2.4v 2.4v 1.5v 1.5v v ih v il v oh v ol input signal output signal t to
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