7272-112912-1 ? ? ? ? ? ? ?? features: ? more feature-rich and cost-effective than the ol7272 and et7273 ? pin to pin replaceable with the ol7272 and functionally equivalent to the et7273 ? push-pull or open-drain output drivers (ls7272) ? open-drain output drivers only (LS7273) ? voltage range: 4.5v ? 30v (v dd ? v ss ) ? 120ma sink/source output drive ? operating frequency up to 4 mhz ? thermal shutdown protection for output driver overload ? enable input with thermal shutdown disconnect feature ? 1.5a dynamic peak output current drive ? outputs rs422a compatible ? inputs cmos/ttl compatible with hysteresis ? output drivers fully connected or high-impedance state part number ordering information: this part is available in three packag e styles, dip, soic, and tssop. for dip packages: ls7272 , LS7273, ls7272-20, LS7273-20 for soic packages: ls7272-s, LS7273-s, ls7272-s20, LS7273-s20 for tssop packages: ls7272-ts , LS7273-ts , ls7272ts20, LS7273ts20 description: 30 volt quad-channel differential line driver nov 201 2 pin assignment ? top view figure 1 lsi figure 2 1 4 5 7 8 ls727 3 2 3 6 a ao ao low bo bo b vss 16 15 14 13 12 11 10 9 vdd d do co ena do co c 1 4 5 7 8 ls7272 2 3 6 a ao ao opd bo bo b vss 16 15 14 13 12 11 10 9 vdd d do co ena do co c the ls7272/LS7273 are short-circuit proof quad differential industrial power line drivers. they can operate up to 30v and have a selectable thermal shutdown features. the data inputs are ttl / cmos compatible and can also be driven up to the supply voltage v dd . the ena input can be used to place all the outputs in a high impedance state. for the ls7272 the opd input is used to connect the outputs as push-pull drivers or open- drain drivers, where the outputs can be returned through external loads to a maximum voltage of v dd . for the LS7273, pin4 is low and is tied to ground . the outputs are open drain and the loads can be returned to any voltage between 4.5v and 30v independent of v dd . an internal 5v regulated supply is used to power the logic and level converter blocks. the thermal shutdown block located in the center of the ic can be disabled by setting the ena input, pin 12, to a voltage between 7.5v and 12v. upon power-up, a power-on-reset (por) circuit block forces all output drivers to the high- impedance state until the power supply voltage reac hes a nominal 3.8v. included in the por circuit block is a hysteresis of 100mv such that if the power supply drops below 3.7v all output drivers are forced to the high-impedance state until the voltage rises above 3.8v. there is a built- in 5 s delay for disabling the output drivers shoul d the power supply drop below 3.7v. the output drivers are immediately enabled when the voltage rises above 3.8v. ? l s i l s i ls7272 ls7272-20 LS7273 LS7273-20
? 7272-112912-2 ? note: ls7272-20 does not have opd pin. input / output description: a / b / c / d these are cmos / ttl data inputs that can also operate with input levels up to the v dd power supply. all data input blocks contain hysteresis. ao / bo / co / do / ao / bo / co / do these outputs can be selected to be push-pu ll or open-drain using the opd input pin (ls7272 only). when in push-pull mode, outp uts switch between v dd and v ss (ground). ena a logic low on this cmos / ttl compatible input enables the out put drivers while logic high forces them into a high-impedance s tate. this input is also used to enable / disable the output short circuit thermal protection. applying a voltage between 7.5v and 12.5v to the ena input will disable the thermal shutdown protection function. when using th is feature, the line driver outputs are enabled but no longer protected. opd (ls7272 only) a logic low on this connects the outputs as open-drain drivers. if this input is left floating, the outputs are connected as pu sh-pull drivers. low (LS7273 only) this pin must be tied low. 1 4 5 7 8 ls7272 - 20 2 3 6 a ao ao n.c. bo bo n.c. 20 19 18 17 16 15 14 13 vdd d do co ena do co c lsi 10 9 12 11 vss b n.c. vss n.c. 1 4 5 7 8 ls727 3 - 20 2 3 6 a ao ao n.c. bo bo n.c. 20 19 18 17 16 15 14 13 vdd d do co ena do co c l s i 10 9 12 11 vss b n.c. vss n.c. figure 3 figure 4
? 7272-112912-3 ? figure 4 ls7272 / LS7273 block diagram v ss ao ao bo bo co co do do v dd a b c d ena low should be tied low . opd (ls7272) 5v regulator cmos / ttl input level converter cmos / ttl input level converter cmos / ttl input level converter cmos / ttl input level converter differential output buffer differential output buffer differential output buffer differential output buffer logic controller tristate outputs push-pull or open drain outputs (ls7272) thermal shut down thermal shut down disable under voltage shut down power on reset ( LS7273 )
? 7272-112912-4 ? absolute maximum ratings parameter symbol value unit dc supply voltage v dd 36 v data output voltage v out v dd + 0.3 v (ls7272) data output voltage v out 4.5 to 36 v (LS7273) drive output current i out 1500 / 120 ma (pulse peak) / average data input voltage v ind v dd + 0.3 v ena input voltage v ine 18 v opd input voltage v ino 5 v (ls7272) low input voltage v inl 5 v (LS7273) operating temperature t a -55 to +125 c storage temperature t stg -65 to +150 c recommended operating conditions parameter symbol value unit dc supply voltage v dd 4.5 to 30 v data input voltage v ind 0 to v dd v ena input voltage v ine 0 to 5.5 v data output voltage v out 0 to v dd v data output voltage v out 4.5 to 30 v (LS7273) data output current i out 100 ma operating temperature t op -40 to +125 c opd v ino 0 to float v (ls7272) low v inl 0 v (LS7273)
? 7272-112912-5 ? electrical characteristics (vdd = 12v, ta = 25 c, unless otherwise specified) parameter symbol min ty p max unit conditions inputs: data input high-threshold v dh - 1.7 2.4 v ena 0.8v data input low threshold v dl 0.8 1.2 - v ena 0.8v data input hysteresis v dhy - 0.5 - v ena 0.8v ena / opd input high-threshold v eh - 1.7 2.4 v - ena / opd input low-threshold v el 0.8 1.2 - v - ena / opd input hysteresis v ehy - 0.5 - v - inputs: leakage current i lkg -5 +5 a ena i eso - 100 a ena = 12v opd, low i dsi -30 - a opd , low= 0v outputs: high-level output voltage (ls7272 only) v oh v dd ? 0.4 v i load = 20ma, v dd = 4.75v v oh v dd ? 0.6 - v i load = 30ma, v dd = 30v output resistance r dson - 20 - i load = 30ma low voltage output voltage v ol - 0.3 - v i load = -20ma, v dd = 4.75v v ol - 0.4 - v i load = -30ma, v dd = 30v high-impedance output leakage current (outputs disabled) i ot -10 +10 a v dd = 20v, 2.4v < ena < 7.5v reset: power-on-reset (por) v por - 3.6 2.4 v - por hysteresis v porh 0.1 - v - por removal time t porr - 5 - s - over-temperature protection: junction temperature operate point t jto 165 c junction temperature release point t jtr - 135 c ena input protection inhibit v epi 7.0 12.5 v note : ena input disables outputs between 2.4v and 7.5v. ena input enables outputs between 7.5v and 12v but disables temperature shutdown. ena input disables outputs above 12v.
? 7272-100611-6 ? ac switching characteristics (vdd = 12v, ta = 25 c, load capacitance = 1000 pf) parameter symbol min ty p max unit conditions propagation delay from 50% point of input rising edge to zero crossing of differential outputs t plh - 105 150 ns v dd = 5v (ls7272 only) - 112 200 ns v dd = 12v (ls7272 only) - 135 250 ns v dd = 24v (ls7272 only) propagation delay from 50% point of input rising edge to zero crossing of differential outputs t phl - 105 150 ns v dd = 5v - 112 280 ns v dd = 12v - 135 330 ns v dd = 24v output rise time t r - 64 125 ns v dd = 5v (ls7272 only) - 75 150 ns v dd = 12v (ls7272 only) - 98 175 ns v dd = 24v (ls7272 only) output fall time t f - 65 125 ns v dd = 5v - 73 175 ns v dd = 12v - 101 250 ns v dd = 24v ena enable time t on - 60 200 ns - ena disable time t off - 80 200 ns - the information included herein is believed to be accurate and reliable. however, lsi computer systems, inc. assumes no responsibilities for inaccuracies, or for any infringements of patent rights of others which may result from its use. ?
|
