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hcpl-9000/-0900, -9030/-0930, hcpl-9031/-0931, -900j/-090j, hcpl-901j/-091j, -902j/-092j high speed digital isolators data sheet description the hcpl-90xx and hcpl-09xx cmos digital isolators feature high speed performance and excellent transient immunity specifications. the symmetric magnetic coupling barrier gives these devices a typical pulse width distortion of 2 ns, a typical propagation delay skew of 4 ns and 100 mbaud data rate, making them the indus- trys fastest digital isolators. the single channel digital isolators (hcpl-9000/ -0900) features an active-low logic output enable. the dual channel digital isolators are configured as unidirectional (hcpl-9030/-0930) and bi-directional (hcpl-9031/-0931), operating in full duplex mode making it ideal for digital fieldbus applications. the quad channel digital isolators are configured as unidirectional (hcpl-900j/-090j), two channels in one direction and two channels in opposite direction (hcpl- 901j/-091j), and one channel in one direction and three channels in opposite direction (hcpl-902j/-092j). these high channel density make them ideally suited to isolating data conversion devices, parallel buses and peripheral interfaces. they are available in 8-pin pdip, 8-pin gull wing, 8-pin soic packages, and 16Cpin soic narrow-body and wide-body packages. they are specified over the tem- perature range of -40c to +100c. features +3.3v and +5v ttl/cmos compatible 3 ns max. pulse width distortion 6 ns max. propagation delay skew 15 ns max. propagation delay high speed: 100 mbd 15 kv/s min. common mode rejection tri-state output (hcpl-9000/-0900) 2500 v rms isolation ul1577 and iec 61010-1 approved applications digital fieldbus isolation multiplexed data transmission computer peripheral interface high speed digital systems isolated data interfaces logic level shifting lead (pb) free rohs 6 fully compliant r o h s 6 fully c o m p l ia n t optio n s a v ai l a bl e ; -xxxe de n otes a l ead -f ree prod uc t caution: it is advised that normal static precautions be taken in handling and assembly of this component to prevent damage and/or degradation which may be induced by esd.
2 selection guide device number channel configuration package hcpl-9000 single 8-pin dip (300 mil) hcpl-0900 single 8-pin small outline hcpl-9030 dual 8-pin dip (300 mil) hcpl-0930 dual 8-pin small outline hcpl-9031 dual, bi-directional 8-pin dip (300 mil) hcpl-0931 dual, bi-directional 8-pin small outline hcpl-900j quad 16-pin small outline, wide body hcpl-090j quad 16-pin small outline, narrow body hcpl-901j quad, 2/2, bi-directional 16-pin small outline, wide body hcpl-091j quad, 2/2, bi-directional 16-pin small outline, narrow body hcpl-902j quad, 1/3, bi-directional 16-pin small outline, wide body hcpl-092j quad, 1/3, bi-directional 16-pin small outline, narrow body ordering information hcpl-09xx and hcpl-90xx are ul recognized with 2500 v rms for 1 minute per ul1577. option rohs non rohs surface gull tape & part number compliant compliant package mount wing reel quantity -000e no option 50 per tube -300e -300 x x 50 per tube -500e -500 x x x 1000 per reel -000e no option x 100 per tube -500e -500 x x 1500 per reel -000e no option x 50 per tube -500e -500 x x 1000 per reel -000e no option x 50 per tube -500e -500 x x 1000 per reel hcpl-9000 hcpl-9030 hcpl-9031 300mil dip-8 so-8 wide body so-16 narrow body so-16 hcpl-0900 hcpl-0930 hcpl-0931 hcpl-900j hcpl-901j hcpl-902j hcpl-090j hcpl-091j hcpl-092j to order, choose a part number from the part number column and combine with the desired option from the option column to form an order entry. example 1: hcpl-9031-500e to order product of 300mil dip gull wing surface mount package in tape and reel in rohs compliant. example 2: hcpl-0900 to order product of so-8 package in tube packaging and non rohs compliant. option datasheets are available. contact your avago sales representative or authorized distributor for information.
3 pin description symbol description v dd1 power supply 1 v dd2 power supply 2 in x logic input signal out x logic output signal gnd 1 power supply ground 1 gnd 2 power supply ground 2 v oe logic output enable (single channel), active low nc not connected functional diagrams truth table in 1 v oe out 1 lll hl h lhz hhz v dd1 in 1 nc gnd 1 gnd 2 out 1 v dd2 v oe 8 7 6 5 1 2 3 4 galvanic isolation hcpl-9000/0900 single channel dual channel v dd1 in 1 in 2 gnd 1 gnd 2 out 2 v dd2 out 1 8 7 6 5 1 2 3 4 galvanic isolation hcpl-9030/0930 quad channel 1 2 3 4 5 6 7 89 10 11 12 13 14 15 16 v dd1 gnd 1 in 1 in 2 in 3 in 4 nc gnd 1 gnd 2 nc out 4 out 3 out 2 out 1 gnd 2 v dd2 galvanic isolation hcpl-900j/-090j 1 2 3 4 5 6 7 89 10 11 12 13 14 15 16 v dd1 gnd 1 in 1 in 2 out 3 out 4 nc gnd 1 gnd 2 nc in 4 in 3 out 2 out 1 gnd 2 v dd2 galvanic isolation hcpl-901j/-091j 1 2 3 4 5 6 7 89 10 11 12 13 14 15 16 v dd1 gnd 1 in 1 in 2 in 3 out 4 nc gnd 1 gnd 2 nc in 4 out 3 out 2 out 1 gnd 2 v dd2 galvanic isolation hcpl-902j/-092j v dd1 in 1 out 2 gnd 1 gnd 2 in 2 v dd2 out 1 8 7 6 5 1 2 3 4 galvanic isolation hcpl-9031/0931
4 package outline drawings hcpl-9000, hcpl-9030 and hcpl-9031 standard dip packages hcpl-9000, hcpl-9030 and hcpl-9031 gull wing surface mount option 300 0.030 (0.762) 0.045 (1.143) 0.370 (9.400) 0.390 (9.900) 0.240 (6.100) 0.260 (6.600) 87 6 5 4 3 2 1 0.045 (1.143) 0.065 (1.651) 0.120 (3.048) 0.150 (3.810) 0.047 (1.194) 0.070 (1.778) 0.040 (1.016) 0.047 (1.194) 0.370 (9.398) 0.390 (9.906) 0.190 (4.826) 0.015 (0.381) 0.025 (0.635) 0.025 (0.632) 0.035 (0.892) 0.030 (0.760) 0.056 (1.400) 0.015 (0.385) 0.035 (0.885) 0.290 (7.370) 0.310 (7.870) 0.370 (9.400) 0.390 (9.900) pad location (for reference only) typ. 12 nom. 0.008 (0.203) 0.013 (0.330) 0.100 (2.540) bsc dimensions inches (millimeters) lead coplanarity = 0.004 inches ( 0.10 mm ) min max 5 6 7 8 4 3 2 1 dimensions: inches (millimeters) min max 0.120 (3.048) 0.150 (3.810) 0.240 (6.096) 0.260 (6.604) 0.015 (0.381) 0.035 (0.889) 0.55 (1.397) 0.65 (1.651) 0.008 (0.203) 0.015 (0.381) 3 8 0.030 (0.762) 0.045 (1.143) 0.015 (0.380) 0.023 (0.584) 0.045 (1.143) 0.065 (1.651) 0.090 (2.286) 0.110 (2.794) 0.370 (9.398) 0.400 (10.160) 0.290 (7.366) 0.310 (7.874) 0.300 (7.620) 0.370 (9.398)
5 87 65 4 3 2 1 0.228 (5.80) 0.244 (6.20) 0.189 (4.80) 0.197 (5.00) 0.150 (3.80) 0.157 (4.00) 0.013 (0.33) 0.020 (0.51) 0.040 (1.016) 0.060 (1.524) 0.004 (0.10) 0.010 (0.25) 0.054 (1.37) 0.069 (1.75) 0.016 (0.40) 0.050 (1.27) 0.008 (0.19) 0.010 (0.25) 0.010 (0.25) 0.020 (0.50) x 45 0 8 dimensions: inches (millimeters) min max hcpl-0900, hcpl-0930 and hcpl-0931 small outline so-8 package hcpl-900j, hcpl-901j and hcpl-902j wide body soic-16 package 1 pin 1 indent 8 7 typ 0.394 (10.007) 0.419 (10.643) 0.397 (10.084) 0.413 (10.490) 0.291 (7.391) 0.299 (7.595) 0.013 (0.330) 0.020 (0.508) 0.040 (1.016) 0.060 (1.524) 0.080 (2.032) 0.100 (2.54) 0.092 (2.337) 0.104 (2.642) 0.004 (0.1016) 0.011 (0.279) 0.016 (0.40) 0.050 (1.27) 0.010 (0.254) 0.020 (0.508) 0.287 (7.290) 0.297 (7.544) x 45 0 C 8 typ 7 typ 0.009 (0.229) 0.012 (0.305) dimensions: inches (millimeters) min max
6 hcpl-090j, hcpl-091j and hcpl-092j narrow body soic-16 package 1 pin 1 indent 8 0.228 (5.791) 0.244 (6.197) 0.386 (9.802) 0.394 (9.999) 0.152 (3.861) 0.157 (3.988) 0.013 (0.330) 0.020 (0.508) 0.040 (1.016) 0.060 (1.524) 0.050 (1.270) 0.060 (1.524) 0.054 (1.372) 0.068 (1.727) 0.004 (0.102) 0.010 (0.249) 0.016 (0.406) 0.050 (1.270) 0.010 (0.245) 0.020 (0.508) 0.008 (0.191) 0.010 (0.249) x 45 0 C 8 typ dimensions: inches (millimeters) min max package characteristics parameter symbol min. typ. max. units test conditions capacitance (input-output) [1] c i-o pf f = 1 mhz single channel 1.1 dual channel 2.0 quad channel 4.0 thermal resistance jct c/w thermocouple located at 8-pin pdip 54 center underside of package 8-pin soic 144 16-pin soic narrow body 41 16-pin soic wide body 28 package power dissipation p pd mw 8-pin pdip 150 8-pin soic 150 16-pin soic narrow body 150 16-pin soic wide body 150 notes: 1. single and dual channels device are considered two-terminal devices: pins 1-4 shorted and pins 5-8 shorted. quad channel dev ices are con- sidered two-terminal devices: pins 1-8 shorted and pins 9-16 shorted. this product has been tested for electrostatic sensitivity to the limits stated in the specifications. however, avago recommends that all inte- grated circuits be handled with appropriate care to avoid damage. damage caused by inappropriate handling or storage could rang e from performance degradation to complete failure.
7 insulation and safety related specifications parameters condition min. typ. max. units barrier impedance ||pf single channel >10 14 || 3 dual channel >10 14 || 3 quad channel >10 14 || 7 creepage distance (external) mm 8-pin pdip 7.036 8-pin soic 4.026 16-pin soic narrow body 4.026 16-pin soic wide body 8.077 leakage current 240 v rms 0.2 a 60 hz iec61010-1 insulation characteristics* description symbol hcpl-0900 hcpl-0930 hcpl-090j hcpl-091j hcpl-092j hcpl-9000 hcpl-9030 hcpl-900j hcpl-901j hcpl-902j units installation classification per din vde 0110/1.89, table 1 for rated mains voltage 150 vrms i C iii i C iv for rated mains voltage 300 vrms i C iii pollution degree (din vde 0110/1.89) 2 2 maximum working insulation voltage viorm 150 300 vrms
8 absolute maximum ratings parameters symbol min. max. units storage temperature t s C55 175 c ambient operating temperature [1] t a C55 125 c supply voltage v dd1 , v dd2 C0.5 7 v input voltage v in C0.5 v dd1 +0.5 v voltage output enable (hcpl-9000/-0900) v oe C0.5 v dd2 +0.5 v output voltage v out C0.5 v dd2 +0.5 v output current drive i out 10 ma lead solder temperature (10s) 260 c esd 2 kv human body model notes: 1. absolute maximum ambient operating t emperature means the device will not be damaged if operated under these conditions. it d oes not guarantee performance. recommended operating conditions parameters symbol min. max. units ambient operating temperature t a C40 100 c supply voltage v dd1 , v dd2 3.0 5.5 v logic high input voltage v ih 2.4 v dd1 v logic low input voltage v il 0 0.8 v input signal rise and fall times t ir , t if 1 s this product has been tested for electrostatic sensitivity to the limits stated in the specifications. however, avago recommends that all integrated circuits be handled with appropriate care to avoid damage. damage caused by inappropriate handling or stor- age could range from performance degradation to complete failure.
9 3.3v operation: electrical specifications test conditions that are not specified can be anywhere within the recommended operating range. all typical specifications are at t a =+25c, v dd1 = v dd2 = +3.3 v. parameter symbol min. typ. max. units test conditions quiescent supply current 1 i dd1 ma v in = 0v hcpl-9000/-0900 0.008 0.01 hcpl-9030/-0930 0.008 0.01 hcpl-9031/-0931 1.5 2.0 hcpl-900j/-090j 0.018 0.02 hcpl-901j/-091j 3.3 4.0 hcpl-902j/-092j 1.5 2.0 quiescent supply current 2 i dd2 ma v in = 0v hcpl-9000/-0900 3.3 4.0 hcpl-9030/-0930 3.3 4.0 hcpl-9031/-0931 1.5 2.0 hcpl-900j/-090j 5.5 8.0 hcpl-901j/-091j 3.3 4.0 hcpl-902j/-092j 3.0 6.0 logic input current i in -10 10 a logic high output voltage v oh v dd2 C 0.1 v dd2 v i out = -20 a, v in =v ih 0.8*v dd2 v dd2 C 0.5 v i out = -4 ma, v in =v ih logic low output voltage v ol 0 0.1 v i out = 20 a, v in =v il 0.5 0.8 v i out = 4 ma, v in =v il switching specifications maximum data rate 100 110 mbd c l = 15 pf clock frequency fmax 50 mhz propagation delay time to logic t phl 12 18 ns low output propagation delay time tologic t plh 12 18 ns high output pulse width t pw 10 ns pulse width distortion [1] |pwd| 2 3 ns |t phl C t plh | propagation delay skew [2] t psk 4 6 ns output rise time (10 C 90%) t r 2 4 ns output fall time (10 C 90%) t f 2 4 ns propagation delay enable to output (single channel) high to high impedance t phz 3 5 ns low to high impedance t plz 3 5 ns high impedance to high t pzh 3 5 ns high impedance to low t pzl 3 5 ns channel-to-channel skew t csk 2 3 ns (dual and quad channels) common mode transient immunity |cm h | 15 18 kv/s v cm = 1000v (output logic high or logic low) [3] |cm l | notes: 1. pwd is defined as |t phl -t plh |. %pwd is equal to the pwd divided by the pulse width. 2. t psk is equal to the magnitude of the worst case difference in t phl and/or t plh that will be seen between units at 25c. 3. cm h is the maximum common mode voltage slew rate that can be sustained while maintaining v out > 0.8v dd2 . cm l is the maximum common mode input voltage that can be sustained while maintaining v out < 0.8v. the common mode voltage slew rates apply to both rising and falling common mode voltage edges. this product has been tested for electrostatic sensitivity to the limits stated in the specifications. however, avago recommends that all integrated circuits be handled with appropriate care to avoid damage. damage caused by inappropriate handling or storage could range from performan ce degradation to complete failure.
10 5v operation: electrical specifications test conditions that are not specified can be anywhere within the recommended operating range. all typical specifications are at t a =+25c, v dd1 = v dd2 = +5.0 v. parameter symbol min. typ. max. units test conditions quiescent supply current 1 i dd1 ma v in = 0v hcpl-9000/-0900 0.012 0.018 hcpl-9030/-0930 0.012 0.018 hcpl-9031/-0931 2.5 3.0 hcpl-900j/-090j 0.024 0.036 hcpl-901j/-091j 5.0 6.0 hcpl-902j/-092j 2.5 3.0 quiescent supply current 2 i dd2 ma v in = 0v hcpl-9000/-0900 5.0 6.0 hcpl-9030/-0930 5.0 6.0 hcpl-9031/-0931 2.5 3.0 hcpl-900j/-090j 8.0 12.0 hcpl-901j/-091j 5.0 6.0 hcpl-902j/-092j 6.0 9.0 logic input current i in -10 10 a logic high output voltage v oh v dd2 C 0.1 v dd2 v i out = -20 a, v in =v ih 0.8*v dd2 v dd2 C 0.5 v i out = -4 ma, v in =v ih logic low output voltage v ol 0 0.1 v i out = 20 a, v in =v il 0.5 0.8 v i out = 4 ma, v in =v il switching specifications maximum data rate 100 110 mbd c l = 15 pf clock frequency fmax 50 mhz propagation delay time to logic t phl 10 15 ns low output propagation delay time to logic t plh 10 15 ns high output pulse width t pw 10 ns pulse width distortion [1] |pwd| 2 3 ns |t phl C t plh | propagation delay skew [2] t psk 4 6 ns output rise time (10 C 90%) t r 1 3 ns output fall time (10 C 90%) t f 1 3 ns propagation delay enable to output (single channel) high to high impedance t phz 3 5 ns low to high impedance t plz 3 5 ns high impedance to high t pzh 3 5 ns high impedance to low t pzl 3 5 ns channel-to-channel skew t csk 2 3 ns (dual and quad channels) common mode transient immunity |cm h | 15 18 kv/s v cm = 1000v (output logic high or logic low) [3] |cm l | notes: 1. pwd is defined as |t phl -t plh |. %pwd is equal to the pwd divided by the pulse width. 2. t psk is equal to the magnitude of the worst case difference in t phl and/or t plh that will be seen between units at 25c. 3. cm h is the maximum common mode voltage slew rate that can be sustained while maintaining v out > 0.8v dd2 . cm l is the maximum common mode input voltage that can be sustained while maintaining v out < 0.8v. the common mode voltage slew rates apply to both rising and falling common mode voltage edges. this product has been tested for electrostatic sensitivity to the limits stated in the specifications. however, avago recommends that all integrated circuits be handled with appropriate care to avoid damage. damage caused by inappropriate handling or storage could range from performan ce degradation to complete failure.
11 mixed 5v/3.3v or 3.3v/5v operation: electrical specifications test conditions that are not specified can be anywhere within the recommended operating range. all typical specifications are at t a =+25c, v dd1 = +5.0 v, v dd2 = +3.3v. parameter symbol min. typ. max. units test conditions hcpl-9000/-0900 0.012 0.018 hcpl-9030/-0930 0.012 0.018 hcpl-9031/-0931 2.5 3.0 hcpl-900j/-090j 0.024 0.036 hcpl-901j/-091j 5.0 6.0 hcpl-902j/-092j 2.5 3.0 quiescent supply current 2 i dd2 ma v in = 0v hcpl-9000/-0900 5.0 6.0 hcpl-9030/-0930 5.0 6.0 hcpl-9031/-0931 2.5 3.0 hcpl-900j/-090j 8.0 12.0 hcpl-901j/-091j 5.0 6.0 hcpl-902j/-092j 6.0 9.0 logic input current i in -10 10 a logic high output voltage v oh v dd2 C 0.1 v dd2 v i out = -20 a, v in =v ih 0.8*v dd2 v dd2 C 0.5 v i out = -4 ma, v in =v ih logic low output voltage v ol 0 0.1 v i out = 20 a, v in =v il 0.5 0.8 v i out = 4 ma, v in =v il switching specifications maximum data rate 100 110 mbd c l = 15 pf clock frequency fmax 50 mhz propagation delay time to logic t phl 12 18 ns low output propagation delay time to logic t plh 12 18 ns high output pulse width t pw 10 ns pulse width distortion [1] |pwd| 2 3 ns |t phl C t plh | propagation delay skew [2] t psk 4 6 ns output rise time (10 C 90%) t r 2 4 ns output fall time (10 C 90%) t f 2 4 ns propagation delay enable to output (single channel) high to high impedance t phz 3 5 ns low to high impedance t plz 3 5 ns high impedance to high t pzh 3 5 ns high impedance to low t pzl 3 5 ns channel-to-channel skew t csk 2 3 ns (dual and quad channels) common mode transient immunity |cm h | 15 18 kv/s v cm = 1000v (output logic high or logic low) [3] |cm l | notes: 1. pwd is defined as |t phl -t plh |. %pwd is equal to the pwd divided by the pulse width. 2. t psk is equal to the magnitude of the worst case difference in t phl and/or t plh that will be seen between units at 25c. 3. cm h is the maximum common mode voltage slew rate that can be sustained while maintaining v out > 0.8v dd2 . cm l is the maximum common mode input voltage that can be sustained while maintaining v out < 0.8v. the common mode voltage slew rates apply to both rising and falling common mode voltage edges. this product has been tested for electrostatic sensitivity to the limits stated in the specifications. however, avago recommends that all integrated circuits be handled with appropriate care to avoid damage. damage caused by inappropriate handling or storage could range from performan ce degradation to complete failure.
12 applications information power consumption the hcpl-90xx and hcpl-09xx cmos digital isolators achieves low power consumption from the manner by which they transmit data across isolation barrier. by detecting the edge transitions of the input logic signal and converting this to a narrow current pulse, which drives the isolation barrier, the isolator then latches the input logic state in the output latch. since the current pulses are narrow, about 2.5 ns wide, the power consump- tion is independent of mark-to-space ratio and solely dependent on frequency. the approximate power supply current per channel is: i(input) = 40(f/fmax)(1/4) ma where f = operating frequency, fmax = 50 mhz. signal status on start-up and shut down to minimize power dissipation, the input signals to the channels of hcpl-90xx and hcpl-09xx digital isolators are differentiated and then latched on the output side of the isolation barrier to reconstruct the signal. this could result in an ambiguous output state depending on power up, shutdown and power loss sequencing. therefore, the designer should consider the inclusion of an initializa- tion signal in this start-up circuit. initialization consists of toggling the input either high then low or low then high. figure 1. functional diagram of single channel hcpl-0900 or hcpl-0900. 1 2 3 45 6 7 8 v dd1 in 1 c1 c2 note: c1, c2 = 47 nf ceramic capacitors nc gnd 1 v dd2 out 1 gnd 2 hcpl-9000 or hcpl-0900 v oe figure 2. recommended printed circuit board layout. c2 v dd2 out 1 gnd 2 v dd1 gnd 1 in 1 c1 v oe hcpl-9000 or hcpl-0900 bypassing and pc board layout the hcpl-90xx and hcpl-09xx digital isolators are extremely easy to use. no external interface circuitry is required because the isolators use high-speed cmos ic technology allowing cmos logic to be connected directly to the inputs and outputs. as shown in figure 1, the only external components required for proper operation are two 47 nf ceramic capacitors for decoupling the power supplies. for each capacitor, the total lead length between both ends of the capacitor and the power-supply pins should not exceed 20 mm. figure 2 illustrates the recom- mended printed circuit board layout for the hcpl-9000 or hcpl-0900. for data rates in excess of 10mbd, use of ground planes for both gnd 1 and gnd 2 is highly recom- mended.
13 propagation delay, pulse width distortion and propaga- tion delay skew propagation delay is a figure of merit, which describes how quickly a logic signal propagates through a system as illustrated in figure 3. figure 3. timing diagrams to illustrate propagation delay, t plh and t phl . figure 4. timing diagrams to illustrate propagation delay skew. v in v out v out v in t psk 50% 50% 2.5 v cmos 2.5 v cmos figure 5. parallel data transmission. data data inputs clock outputs clock t psk t psk input output 5 v cmos 2.5 v cmos 0 v v oh v ol v out v in t plh t phl 50% 10% 90% 90% 10% the propagation delay from low to high, t plh , is the amount of time required for an input signal to propagate to the output, causing the output to change from low to high. similarly, the propagation delay from high to low, t phl , is the amount of time required for the input signal to propagate to the output, causing the output to change from high to low. pulse width distortion, pwd, is the difference between t phl and t plh and often determines the maximum data rate ca- pability of a transmission system. pwd can be expressed in percent by dividing the pwd (in ns) by the minimum pulse width (in ns) being transmitted. typically, pwd on the order of 20 C 30% of the minimum pulse width is tolerable. propagation delay skew, t psk , and channel-to-channel skew, t csk , are critical parameters to consider in parallel data transmission applications where synchronization of signals on parallel data lines is a concern. if the parallel data is being sent through channels of the digital isolators, differences in propagation delays will cause the data to arrive at the outputs of the digital isolators at different times. if this difference in propagation delay is large enough, it will limit the maximum transmission rate at which parallel data can be sent through the digital isolators. t psk is defined as the difference between the minimum and maximum propagation delays, either t plh or t phl , among two or more devices which are operating under the same con- ditions (i.e., the same drive current, supply voltage, output load, and operating temperature). t csk is defined as the difference between the minimum and maximum propaga- tion delays, either t plh or t phl , among two or more channels within a single device (applicable to dual and quad channel devices) which are operating under the same conditions. as illustrated in figure 4, if the inputs of two or more devices are switched either on or off at the same time, t psk is the difference between the minimum propagation delay, either t plh or t phl , and the maximum propagation delay, either t plh or t phl . as mentioned earlier, t psk , can determine the maximum parallel data transmission rate. figure 5 shows the timing diagram of a typical parallel data transmission application with both the clock and data lines being sent through the digital isolators. the figure shows data and clock signals at the inputs and outputs of the digital isolators. in this case, the data is clocked off the rising edge of the clock.
propagation delay skew represents the uncertainty of where an edge might be after being sent through a digital isolator. figure 5 shows that there will be uncertainty in both the data and clock lines. it is important that these two areas of uncertainty not overlap, otherwise the clock signal might arrive before all of the data outputs have settled, or some of the data outputs may start to change before the clock signal has arrived. from these consider- ations, the absolute minimum pulse width that can be sent through digital isolators in a parallel application is twice t psk . a cautious design should use a slightly longer pulse width to ensure that any additional uncertainty in the rest of the circuit does not cause a problem. figure 6 shows the minimum pulse width, rise and fall time, and propagation delay enable to output waveforms for hcpl-9000 or hcpl-0900. figure 6. timing diagrams to illustrate the minimum pulse width, rise and fall time, and propagation delay enable to output w aveforms for hcpl-9000 or hcpl-0900. 50% 50% 90% 10% 10% 90% v in v out v oe t pw t plz t pzh t phz t pzl t f t r t pw minimum pulse width t phz propagation delay, high to high impedance t plz propagation delay, low to high impedance t pzl propagation delay, high impedance to low t pzh propagation delay, high impedance to high t r rise time t f fall time for prod uc t i nf or m atio n a n d a c o m plete list o f distri bu tors, please go to o u r we b site: www.avagotech.com a v ago, a v ago te c h n ologies, a n d the a logo are trade m arks o f a v ago te c h n ologies i n the u n ited states a n d other c o un tries. data s ub je c t to c ha n ge. cop y right ? 2005 - 2010 a v ago te c h n ologies. all rights reser v ed. o b soletes 5989 - 0803en av02 - 0137en - j u l y 14, 2010

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