1 ps8607 03/12/02 product description pericom semiconductor?s pi74lpt series of logic circuits are pro- duced using the company?s advanced 0.6 micron cmos technology, achieving industry leading speed grades. the pi74lpt16l245 is a low noise 16-bit bidirectional transceiver designed for asynchronous two-way communication between data buses. the direction control input pin (xdir) determines the direction of data flow through the bidirectional transceiver. the direction and output enable controls are designed to operate this device as either two independent 8-bit transceivers or one 16-bit transceiver. the output enable (oe) input, when high, disables both a and b ports by placing them in high z condition. the pi74lpt16l245 can be driven from either 3.3v or 5.0v devices allowing this device to be used as a translator in a mixed 3.3/5.0v system. product features compatible with lcx? and lvt? families of products supports 5v tolerant mixed signal mode operation ? input can be 3v or 5v ? output can be 3v or connected to 5v bus advanced low power cmos operation excellent output drive capability: balanced drives (6 ma sink and source) pin compatible with industry standard double-density pinouts low noise, overshoot/undershoot, 1v max. low ground bounce outputs hysteresis on all inputs industrial operating temperature range: ?40c to +85c multiple center pins and distributed vcc/gnd pins minimize switching noise packages available: ? 48-pin 240 mil wide thin plastic tssop (a) ? 48-pin 300 mil wide plastic ssop (v) logic block diagram 1 b 0 1 a 0 1 oe 1 dir 1 b 1 1 a 1 1 b 2 1 a 2 1 b 3 1 a 3 1 b 4 1 a 4 1 b 5 1 a 5 1 b 6 1 a 6 1 b 7 1 a 7 2 b 0 2 a 0 2 oe 2 dir 2 b 1 2 a 1 2 b 2 2 a 2 2 b 3 2 a 3 2 b 4 2 a 4 2 b 5 2 a 5 2 b 6 2 a 6 2 b 7 2 a 7
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2 ps8607 03/12/02 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 product pin configuration product pin description pin name description xoe 3-state output enable inputs (active low) xdir direction control input xax side a inputs or 3-state inputs xbx side b outputs or 3-state outputs gnd ground v cc power inputs (1) x oe xdir outputs (1) l l bus b data to bus a l h bus a data to bus b hxz truth table note: 1. h = high voltage level, x = don't care, l = low voltage level, z = high impedance 1 dir 1 1 b 0 2 1 b 1 3 gnd 4 1 b 2 5 1 b 3 6 v cc 7 1 b 4 8 1 b 5 9 gnd 10 1 b 6 11 1 b 7 12 2 b 0 13 2 b 1 14 gnd 15 2 b 2 16 2 b 3 17 v cc 18 2 b 4 19 2 b 5 20 gnd 21 2 b 6 22 2 b 7 23 2 dir 24 1 oe 48 1 a 0 47 1 a 1 46 gnd 45 1 a 2 44 1 a 3 43 v cc 42 1 a 4 41 1 a 5 40 gnd 39 1 a 6 38 1 a 7 37 2 a 0 36 2 a 1 35 gnd 34 2 a 2 33 2 a 3 32 v cc 31 2 a 4 30 2 a 5 29 gnd 28 2 a 6 27 2 a 7 26 2 oe 25 note: 1. this parameter is determined by device characterization but is not production tested. capacitance (t a = 25c, f = 1 mhz) parameters (1) description test conditions typ max. units c in input capacitance v in = 0 v 4.5 6 pf c out output capacitance v out = 0 v 5.5 8 pf 48-pin v48 a48
3 ps8607 03/12/02 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 dc electrical characteristics (over the operating range, t a = ?40c to +85c, v cc = 2.7v to 3.6v) parameters description test conditions (1) min. typ (2) max. units v ih input high voltage (input pins) guaranteed logic high level 2.2 ? 5.5 v input high voltage (i/o pins) 2.0 ? 5.5 v v il input low voltage guaranteed logic low level ?0.5 ? 0.8 v (input and i/o pins) i ih input high current (input pins) v cc = max. v in = 5.5v ? ? 1 a input high current (i/o pins) v cc = max. v in = v cc ??1a i il input low current (input pins) v cc = max. v in = gnd ? ? 1 a input low current (i/o pins) v cc = max. v in = gnd ? ? 1 a i ozh high impedance output current v cc = max. v out = 5.5v ? ? 1 a i ozl (3-state output pins) v cc = max. v out = gnd ? ? 1 a v ik clamp diode voltage v cc = min., i in = ?18 ma ? ?0.7 ?1.2 v i odh output high current v cc = 3.3v, v in = v ih or v il , v o = 1.5v (3) ?15 ?28 ?60 ma i odl output low current v cc = 3.3v, v in = v ih or v il , v o = 1.5v (3) 20 30 60 ma v oh output high voltage v cc = min. ,v in = v ih or v il i oh = ?0.1 ma vcc-0.2 v cc = 3.0v, i oh = ?6 ma 2.4 (5) 2.6 ? v v in = v ih or v il i oh = ?12 ma 2.0 ? ? v ol output low voltage v cc = min. i ol = 0.1 ma ? ? 0.2 v v in = v ih or v il i ol = 6 ma ? 0.3 0.5 v i os short circuit current (4) v cc = max. (3) , v out = gnd ?30 ?56 ?120 ma i off power down disable v cc = 0v, v in or v out 4.5v ? ? 100 a v h input hysteresis ? 150 ? mv maximum ratings (above which the useful life may be impaired. for user guidelines, not tested.) note: stresses greater than those listed under maximum ratings may cause permanent damage to the de- vice. this is a stress rating only and functional opera- tion of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect reliability. notes: 1. for max. or min. conditions, use appropriate value specified under electrical characteristics for the applicable device type . 2. typical values are at vcc = 3.3v, +25c ambient and maximum loading. 3. not more than one output should be shorted at one time. duration of the test should not exceed one second. 4. this parameter is guaranteed but not tested. 5. v oh = v cc ? 0.6v at rated current. storage temperature ............................................................. ?55c to +125c ambient temperature with power applied ............................ ?40c to +85c supply voltage to ground potential (inputs & vcc only) ...... ?0.5v to +7.0v supply voltage to ground potential (outputs & d/o only) .. ?0.5v to +7.0v dc input voltage .................................................................... ?0.5v to +7.0v dc output current .............................................................................. 120 ma power dissipation .................................................................................... 1.0w
4 ps8607 03/12/02 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 power supply characteristics parameters description test conditions (1) min. typ (2) max. units i cc quiescent power supply current v cc = max. v in = gnd or v cc 0.1 10 a ? i cc quiescent power supply current v cc = max. v in = v cc ? 0.6v (3) 2.0 30 a ttl inputs high i ccd dynamic power supply (4) v cc = max., v in = v cc 50 75 a/ outputs open v in = gnd mhz x oe = xdir = gnd one bit toggling 50% duty cycle i c total power supply v cc = max., v in = v cc ? 0.6v 0.5 0.8 ma current (6) outputs open v in = gnd f i = 10 mh z 50% duty cycle x oe = xdir = gnd one bit toggling v cc = max., v in = v cc ? 0.6v 2.0 3.3 (5) outputs open v in = gnd f i = 2.5 mh z 50% duty cycle x oe = xdir = gnd 16 bits toggling notes: 1. for max. or min. condition, use appropriate value specified under electrical characteristics for the applicable device. 2. typical values are at vcc = 3.3v, +25c ambient. 3. per ttl driven input; all other inputs at vcc or gnd. 4. this parameter is not directly testable, but is derived for use in total power supply calculations. 5. values for these conditions are examples of the icc formula. these limits are guaranteed but not tested. 6. i c =i quiescent + i inputs + i dynamic i c = i cc + ? i cc d h n t + i ccd (f cp /2 + f i n i ) i cc = quiescent current (i ccl , i cch and i ccz ) ? i cc = power supply current for a ttl high input d h = duty cycle for ttl inputs high n t = number of ttl inputs at d h i ccd = dynamic current caused by an input transition pair (hlh or lhl) f cp = clock frequency for register devices (zero for non-register devices) n cp = number of clock inputs at f cp f i = input frequency n i = number of inputs at f i all currents are in milliamps and all frequencies are in megahertz.
5 ps8607 03/12/02 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 switching characteristics over operating range (1) lpt16l245 lpt16l245a lpt16l245c com. com. com. parameters description conditions (2) min. (3) max. min. (3) max. min. (3) max. units t plh propagation delay c l = 50 pf 1.5 5.2 1.5 4.6 1.5 5.5 (6) ns t phl a to b, b to a r l = 500 ? t pzh output enable time 1.5 7.2 1.5 6.2 1.5 5.8 ns t pzl xoe to a or b t phz output disable time (4) 1.5 7.2 1.5 5.0 1.5 4.8 n s t plz xoe to a or b t pzh output enable time 1.5 7.2 1.5 6.2 1.5 5.8 ns t pzl xdir to a or b t phz output disable time 1.5 7.2 1.5 5.0 1.5 4.8 ns t plz xdir to a or b (4) t sk (o) output skew (5) 0.5 0.5 0.5 n s notes: 1. propagation delays and enable/disable times are with vcc = 3.3v 0.3v, normal range. for vcc = 2.7v, extended range, all propagation delays and enable/disable times should be degraded by 20%. 2. see test circuit and wave forms. 3. minimum limits are guaranteed but not tested on propagation delays. 4. this parameter is guaranteed but not production tested. 5. skew between any two outputs, of the same package, switching in the same direction. this parameter is guaranteed by design. 6. all bits switching with 80pf c l .
noise characteristics
6 ps8607 03/12/02 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 1234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901 2123456789012 pericom semiconductor corporation 2380 bering drive ? san jose, ca 95131 1-800-435-2336 fax (408) 435-1100 http://www.pericom.com !"#$$%&'( !"#$$%&
( 0.20 0.51 1.01 0.25 0.381 0.635 .008 .008 .016 0-8? 0.20 0.40 .110 2.79 .010 gauge plane .02 .04 .015 .025 x 45? .025 bsc 0.635 .291 .299 x.xx x.xx denotes dimensions in millimeters 7.39 7.59 .395 .420 10.03 10.67 .620 .630 15.75 16.00 .008 .0135 0.20 0.34 1 48 nom. max .236 .244 .488 .496 .002 .006 seating plane .007 .010 .0197 bsc .004 .008 .319 1 48 12.4 12.6 6.0 6.2 0.50 0.17 0.27 8.1 0.05 0.15 0.09 0.20 x.xx x.xx denotes dimensions in millimeters .018 .030 0.45 0.75 .047 1.20 max bsc
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