MC10E211, MC100E211 5VECL 1:6 Differential Clock Distribution Chip The MC10E/100E211 is a low skew 1:6 fanout device designed explicitly for low skew clock distribution applications. The E211 features a multiplexed clock input to allow for the distribution of a lower speed scan or test clock along with the high speed system clock. When LOW (or left open in which case it will be pulled LOW by the input pulldown resistor) the SEL pin will select the differential clock input. Both a common enable and individual output enables are provided. When asserted the positive output will go LOW on the next negative transition of the CLK (or SCLK) input. The enabling function is synchronous so that the outputs will only be enabled/disabled when the outputs are already in the LOW state. In this way the problem of runt pulse generation during the disable operation is avoided. Note that the internal flip flop is clocked on the falling edge of the input clock edge, therefore all associated specifications are referenced to the negative edge of the CLK input. The output transitions of the E211 are faster than the standard ECLinPS edge rates. This feature provides a means of distributing higher frequency signals than capable with the E111 device. Because of these edge rates and the tight skew limits guaranteed in the specification, there are certain termination guidelines which must be followed. For more details on the recommended termination schemes please refer to the applications information section of this data sheet. The VBB pin, an internally generated voltage supply, is available to this device only. For single-ended input conditions, the unused differential input is connected to VBB as a switching reference voltage. VBB may also rebias AC coupled inputs. When used, decouple VBB and VCC via a 0.01 F capacitor and limit current sourcing or sinking to 0.5 mA. When not used, VBB should be left open. The 100 Series contains temperature compensation. * * * * * * * * * * * * * * Guaranteed Low Skew Specification Synchronous Enabling/Disabling Multiplexed Clock Inputs VBB Output for Single-Ended Use Common and Individual Enable/Disable Control High Bandwidth Output Transistors PECL Mode Operating Range: VCC = 4.2 V to 5.7 V with VEE = 0 V NECL Mode Operating Range: VCC = 0 V with VEE = -4.2 V to -5.7 V Internal Input 75 k Pulldown Resistors ESD Protection: Human Body Model; > 2 kV, Machine Model; > 100 V Meets or Exceeds JEDEC Spec EIA/JESD78 IC Latchup Test Moisture Sensitivity Level 1 For Additional Information, see Application Note AND8003/D Flammability Rating: UL 94 V-0 @ 0.125 in, Oxygen Index: 28 to 34 Transistor Count = 457 devices Semiconductor Components Industries, LLC, 2004 March, 2004 - Rev. 8 503 http://onsemi.com MARKING DIAGRAMS 1 28 MC10E211FN AWLYYWW PLCC-28 FN SUFFIX CASE 776 1 28 MC100E211FN AWLYYWW A WL YY WW = Assembly Location = Wafer Lot = Year = Work Week ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page 511 of this data sheet. Publication Order Number: MC10E211/D MC10E211, MC100E211 EN4 EN5 VCC0 Q5 25 24 23 22 Q5 Q4 Q4 21 20 19 Table 1. PIN DESCRIPTION PIN EN3 26 18 Q3 SEL 27 17 Q3 SCLK 28 16 VCC VEE 1 15 Q2 CLK 2 14 Q2 CLK 3 13 Q1 VBB 4 12 Q1 5 6 CEN EN2 7 8 9 10 11 EN1 EN0 VCC0 Q0 Q0 FUNCTION EN0-EN5 SEL SCLK CLK, CLK CEN Q0-Q5, Q0-Q5 VBB VCC, VCCO VEE NC ECL Enable ECL Select (Clock) ECL Single Clock ECL Differential Clock ECL Common Enable ECL Differential Outputs Reference Voltage Output Positive Supply Negative Supply No Connect *All VCC and VCCO pins are tied together on the die. Warning: All VCC, VCCO, and VEE pins must be externally connected to Power Supply to guarantee proper operation. Figure 10. Pinout: PLCC-28 (Top View) Q0 Table 2. FUNCTION TABLE Q0 EN0 DQ CLK SCLK SEL ENx Q H/L X Z* X H/L Z* L H X L L H CLK SCLK L *Z = Negative transition of CLK or SCLK CLK BITS 1-4 0 CLK SCLK SEL Q1-4 1 Q1-4 DQ EN1-4 CEN Q5 Q5 EN5 DQ VBB Figure 11. Logic Diagram http://onsemi.com 504 MC10E211, MC100E211 Table 3. MAXIMUM RATINGS Symbol Parameter Condition 1 Condition 2 Rating Unit VCC PECL Mode Power Supply VEE = 0 V 8 V VEE NECL Mode Power Supply VCC = 0 V -8 V VI PECL Mode Input Voltage NECL Mode Input Voltage VEE = 0 V VCC = 0 V 6 -6 V V Iout Output Current Continuous Surge 50 100 mA mA IBB VBB Sink/Source 0.5 mA TA Operating Temperature Range 0 to +85 C Tstg Storage Temperature Range -65 to +150 C JA Thermal Resistance (Junction-to-Ambient) 0 lfpm 500 lfpm PLCC-28 PLCC-28 63.5 43.5 C/W C/W JC Thermal Resistance (Junction-to-Case) Standard Board PLCC-28 22 to 26 C/W VEE PECL Operating Range NECL Operating Range 4.2 to 5.7 -5.7 to -4.2 V V VI VCC VI VEE Tsol Wave Solder <2 to 3 sec @ 248C 265 C Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied, damage may occur and reliability may be affected. http://onsemi.com 505 MC10E211, MC100E211 Table 4. 10E SERIES PECL DC CHARACTERISTICS VCCx = 5.0 V; VEE = 0.0 V (Note 2) 0C Symbol Characteristic Min 25C Typ Max 119 160 Min 85C Typ Max 119 160 Min Typ Max Unit 119 160 mA IEE Power Supply Current VOH Output HIGH Voltage (Note 3) 3980 4070 4160 4020 4105 4190 4090 4185 4280 mV VOL Output LOW Voltage (Note 3) 3050 3210 3370 3050 3210 3370 3050 3227 3405 mV VIH Input HIGH Voltage (Single-Ended) 3830 3995 4160 3870 4030 4190 3940 4110 4280 mV VIL Input LOW Voltage (Single-Ended) 3050 3285 3520 3050 3285 3520 3050 3302 3555 mV VBB Output Voltage Reference 3.62 3.74 3.65 3.75 3.69 3.81 V VIHCMR Input HIGH Voltage Common Mode Range (Differential Configuration) (Note 4) 2.4 4.6 2.4 4.6 2.4 4.6 V IIH Input HIGH Current 150 A IIL Input LOW Current 150 0.5 0.3 150 0.5 0.25 0.3 A 0.2 NOTE: Device will meet the specifications after thermal equilibrium has been established when mounted in a test socket or printed circuit board with maintained transverse airflow greater than 500 lfpm. Electrical parameters are guaranteed only over the declared operating temperature range. Functional operation of the device exceeding these conditions is not implied. Device specification limit values are applied individually under normal operating conditions and not valid simultaneously. 2. Input and output parameters vary 1:1 with VCC. VEE can vary -0.46 V / +0.06 V. 3. Outputs are terminated through a 50 resistor to VCC - 2.0 V. 4. VIHCMR min varies 1:1 with VEE, max varies 1:1 with VCC. Table 5. 10E SERIES NECL DC CHARACTERISTICS VCCx = 0.0 V; VE E= -5.0 V (Note 5) 0C Symbol Characteristic Min 25C Typ Max 119 160 Min 85C Typ Max 119 160 Min Typ Max Unit 119 160 mA IEE Power Supply Current VOH Output HIGH Voltage (Note 6) -1020 -930 -840 -980 -895 -810 -910 -815 -720 mV VOL Output LOW Voltage (Note 6) -1950 -1790 -1630 -1950 -1790 -1630 -1950 -1773 -1595 mV VIH Input HIGH Voltage (Single-Ended) -1170 -1005 -840 -1130 -970 -810 -1060 -890 -720 mV VIL Input LOW Voltage (Single-Ended) -1950 -1715 -1480 -1950 -1715 -1480 -1950 -1698 -1445 mV VBB Output Voltage Reference -1.38 -1.27 -1.35 -1.25 -1.31 -1.19 V VIHCMR Input HIGH Voltage Common Mode Range (Differential Configuration) (Note 7) -2.6 -0.4 -2.6 -0.4 -2.6 -0.4 V IIH Input HIGH Current 150 A IIL Input LOW Current 150 0.5 0.3 150 0.5 0.065 0.3 0.2 A NOTE: Device will meet the specifications after thermal equilibrium has been established when mounted in a test socket or printed circuit board with maintained transverse airflow greater than 500 lfpm. Electrical parameters are guaranteed only over the declared operating temperature range. Functional operation of the device exceeding these conditions is not implied. Device specification limit values are applied individually under normal operating conditions and not valid simultaneously. 5. Input and output parameters vary 1:1 with VCC. VEE can vary -0.46 V / +0.06 V. 6. Outputs are terminated through a 50 resistor to VCC - 2.0 V. 7. VIHCMR min varies 1:1 with VEE, max varies 1:1 with VCC. http://onsemi.com 506 MC10E211, MC100E211 Table 6. 100E SERIES PECL DC CHARACTERISTICS VCCx= 5.0 V; VEE= 0.0 V (Note 8) 0C Symbol Characteristic Min 25C Typ Max 119 160 Min 85C Typ Max 119 160 Min Typ Max Unit 137 164 mA IEE Power Supply Current VOH Output HIGH Voltage (Note 9) 3975 4050 4120 3975 4050 4120 3975 4050 4120 mV VOL Output LOW Voltage (Note 9) 3190 3295 3380 3190 3255 3380 3190 3260 3380 mV VIH Input HIGH Voltage (Single-Ended) 3835 3975 4120 3835 3975 4120 3835 3975 4120 mV VIL Input LOW Voltage (Single-Ended) 3190 3355 3525 3190 3355 3525 3190 3355 3525 mV VBB Output Voltage Reference 3.62 3.74 3.62 3.74 3.62 3.74 V VIHCMR Input HIGH Voltage Common Mode Range (Differential Configuration) (Note 10) 2.4 4.6 2.4 4.6 2.4 4.6 V IIH Input HIGH Current 150 A IIL Input LOW Current 150 0.5 0.3 150 0.5 0.25 0.5 A 0.2 NOTE: Device will meet the specifications after thermal equilibrium has been established when mounted in a test socket or printed circuit board with maintained transverse airflow greater than 500 lfpm. Electrical parameters are guaranteed only over the declared operating temperature range. Functional operation of the device exceeding these conditions is not implied. Device specification limit values are applied individually under normal operating conditions and not valid simultaneously. 8. Input and output parameters vary 1:1 with VCC. VEE can vary -0.46 V / +0.8 V. 9. Outputs are terminated through a 50 resistor to VCC - 2.0 V. 10. VIHCMR min varies 1:1 with VEE, max varies 1:1 with VCC. Table 7. 100E SERIES NECL DC CHARACTERISTICS VCCx= 0.0 V; VEE= -5.0 V (Note 11) 0C Symbol Characteristic Min 25C Typ Max 119 160 Min 85C Typ Max 119 160 Min Typ Max Unit 137 164 mA IEE Power Supply Current VOH Output HIGH Voltage (Note 12) -1025 -950 -880 -1025 -950 -880 -1025 -950 -880 mV VOL Output LOW Voltage (Note 12) -1810 -1705 -1620 -1810 -1745 -1620 -1810 -1740 -1620 mV VIH Input HIGH Voltage (Single-Ended) -1165 -1025 -880 -1165 -1025 -880 -1165 -1025 -880 mV VIL Input LOW Voltage (Single-Ended) -1810 -1645 -1475 -1810 -1645 -1475 -1810 -1645 -1475 mV VBB Output Voltage Reference -1.38 -1.26 -1.38 -1.26 -1.38 -1.26 V VIHCMR Input HIGH Voltage Common Mode Range (Differential Configuration) (Note 13) -2.6 -0.4 -2.6 -0.4 -2.6 -0.4 V IIH Input HIGH Current 150 A IIL Input LOW Current 150 0.5 0.3 150 0.5 0.25 0.5 0.2 A NOTE: Device will meet the specifications after thermal equilibrium has been established when mounted in a test socket or printed circuit board with maintained transverse airflow greater than 500 lfpm. Electrical parameters are guaranteed only over the declared operating temperature range. Functional operation of the device exceeding these conditions is not implied. Device specification limit values are applied individually under normal operating conditions and not valid simultaneously. 11. Input and output parameters vary 1:1 with VCC. VEE can vary -0.46 V / +0.8 V. 12. Outputs are terminated through a 50 resistor to VCC - 2.0 V. 13. VIHCMR min varies 1:1 with VEE, max varies 1:1 with VCC. http://onsemi.com 507 MC10E211, MC100E211 Table 8. AC CHARACTERISTICS VCCx= 5.0 V; VEE= 0.0 V or VCCx= 0.0 V; VEE= -5.0 V (Note 14) 0C Symbol Characteristic fMAX Maximum Toggle Frequency tPLH tPHL Propagation Delay to Output CLK to Q (Diff) CLK to Q (SE) SCLK to Q SEL to Q tPHL Disable Time CLK or SCLK to Q (Note 16) tskew Part-to-Part Skew Min Random Clock Jitter (RMS) ts Setup Time Max Min 700 Typ 85C Max Min 700 Typ Max 700 Unit MHz ps 795 745 650 745 930 930 900 970 1065 1115 1085 1195 600 800 50 270 370 75 805 755 650 755 940 940 910 980 1075 1125 1095 1205 600 800 50 270 370 75 825 775 650 775 960 960 930 1000 1095 1145 1115 1225 600 800 ps ps CLK (Diff) to Q CLK (SE), SCLK to Q Within-Device Skew (Note 15) tJITTER Typ 25C <1 270 370 75 <1 <1 ps ps ENx to CLK CEN to CLK (Note 16) 200 200 -100 0 200 200 -100 0 200 200 -100 0 th Hold Time CLK to ENx, CEN (Note 16) 900 600 900 160 900 600 VPP Minimum Input Swing (CLK) (Note 17) 0.25 1.0 0.25 1.0 0.25 1.0 tr tf Rise/Fall Times (20 - 80%) 150 400 150 400 150 400 ps V ps NOTE: Device will meet the specifications after thermal equilibrium has been established when mounted in a test socket or printed circuit board with maintained transverse airflow greater than 500 lfpm. Electrical parameters are guaranteed only over the declared operating temperature range. Functional operation of the device exceeding these conditions is not implied. Device specification limit values are applied individually under normal operating conditions and not valid simultaneously. 14. 10 Series: VEE can vary -0.46 V / +0.06 V. 100 Series: VEE can vary -0.46 V / +0.8 V. 15. Within-Device skew is defined for identical transitions on similar paths through a device. 16. Setup, Hold and Disable times are all relative to a falling edge on CLK or SCLK. 17. Minimum input swing for which AC parameters are guaranteed. Full DC ECL output swings will be generated with only 50 mV input swings. http://onsemi.com 508 MC10E211, MC100E211 APPLICATIONS INFORMATION General Description situations between cards there will be no AC performance or noise margin loss for the differential CLK inputs. For situations where TTL clocks are required the E211 can be interfaced with the H641 or H643 ECL to TTL Clock Distribution Chips. The H641 is a single supply 1:9 PECL to TTL device while the H643 is a 1:8 dual supply standard ECL to TTL device. By combining the superior skew performance of the E211, or E111, with the low skew translating capabilities of the H641 and H643 very low skew TTL clock distribution networks can be realized. The MC10E/100E211 is a 1:6 fanout tree designed explicitly for low skew high speed clock distribution. The device was targeted to work in conjunction with the E111 device to provide another level of flexibility in the design and implementation of clock distribution trees. The individual synchronous enable controls and multiplexed clock inputs make the device ideal as the first level distribution unit in a distribution tree. The device provides the ability to distribute a lower speed scan or test clock along with the high speed system clock to ease the design of system diagnostics and self test procedures. The individual enables could be used to allow for the disabling of individual cards on a backplane in fault tolerant designs. Because of lower fanout and larger skews the E211 will not likely be used as an alternative to the E111 for the bulk of the clock fanout generation. Figure 12 shows a typical application combining the two devices to take advantage of the strengths of each. Handling Open Inputs and Outputs All of the input pins of the E211 have a 50 k to 75 k pulldown resistor to pull the input to VEE when left open. This feature can cause a problem if the differential clock inputs are left open as the input gate current source transistor will become saturated. Under these conditions the outputs of the CLK input buffer will go to an undefined state. It is recommended, if possible,that the SCLK input should be selected any time the differential CLK inputs are allowed to float. The SCLK buffer, under open input conditions, will maintain a defined output state and thus the Q outputs of the device will be in a defined state (Q = LOW). Note that if all of the inputs are left open the differential CLK input will be selected and the state of the Q outputs will be undefined. With the simultaneous switching characteristics and the tight skew specifications of the E211 the handling of the unused outputs becomes critical. To minimize the noise generated on the die all outputs should be terminated in pairs, i.e. both the true and compliment outputs should be terminated even if only one of the outputs will be used in the system. With both complimentary pairs terminated the current in the VCC pins will remain essentially constant and thus inductance induced voltage glitches on VCC will not occur. VCC glitches will result in distorted output waveforms and degradations in the skew performance of the device. The package parasitics of the PLCC-28 cause the signals on a given pin to be influenced by signals on adjacent pins. The E211 is characterized and tested with all of the outputs switching, therefore the numbers in the data book are guaranteed only for this situation. If all of the outputs of the E211 are not needed and there is a desire to save power the unused output pairs can be left unterminated. Unterminated outputs can influence the propagation delay on adjacent pins by 15 ps - 20 ps. Therefore under these conditions this 15 ps - 20 ps needs to be added to the overall skew of the device. Pins which are separated by a package corner are not considered adjacent pins in the context of propagation delay influence. Therefore as long as all of the outputs on a single side of the package are terminated the specification limits in the data sheet will apply. E111 Q0 E211 BACKPLANE Q0 Q8 E111 Q5 Q0 Q8 Figure 12. Standard E211 Application Using the E211 in PECL Designs The E211 device can be utilized very effectively in designs utilizing only a +5 V power supply. Since the internal switching reference levels are biased off of the VCC supply the input thresholds for the single-ended inputs will vary with VCC. As a result the single-ended inputs should be driven by a device on the same board as the E211. Driving these inputs across a backplane where significant differences between the VCC's of the transmitter and receiver can occur can lead to AC performance and/or significant noise margin degradations. Because the differential I/O does not use a switching reference, and due to the CMR range of the E211, even under worst case VCC http://onsemi.com 509 MC10E211, MC100E211 APPLICATIONS INFORMATION Differential versus Single-Ended Use IN As can be seen from the data sheet, to minimize the skew of the E211 the device must be used in the differential mode. In the single-ended mode the propagation delays are dependent on the relative position of the VBB switching reference. Any VBB offset from the center of the input swing will add delay to either the TPLH or TPHL and subtract delay from the other. This increase and decrease in delay will lead to an increase in the duty cycle skew and thus part-to-part skew. The within-device skew will be independent of the VBB and therefore will be the same regardless of whether the device is driven differentially or single-ended. For applications where part-to-part skew or duty cycle skew are not important the advantages of single-ended clock distribution may lead to its use. Using single-ended interconnect will reduce the number of signal traces to be routed, but remember that all of the complimentary outputs still need to be terminated therefore there will be no reduction in the termination components required. To use the E211 with a single-ended input the arrangement pictured in Figure 14 should be used. If the input to the differential CLK inputs are AC coupled as pictured in Figure 13 the dependence on a centered VBB reference is removed. The situation pictured will ensure that the input is centered around the bias set by the VBB. As a result when AC coupled the AC specification limits for a differential input can be used. For more information on AC coupling please refer to the interfacing section of the design guide in the ECLinPS data book. 0.001F 50 IN 0.01F VBB Figure 13. AC Coupled Input IN IN 0.01 F Using the Enable Pins Both the common enable (CEN) and the individual enables (ENx) are synchronous to the CLK or SCLK input depending on which is selected. The active low signals are clocked into the enable flip flops on the negative edges of the E211 clock inputs. In this way the devices will only be disabled when the outputs are already in the LOW state. The internal propagation delays are such that the delay to the output through the distribution buffers is less than that through the enable flip flops. This will ensure that the disabling of the device will not slice any time off the clock pulse. On initial power up the enable flip flops will randomly attain a stable state, therefore precautions should be taken on initial power up to ensure the E211 is in the desired state. VBB Figure 14. Single-Ended Input http://onsemi.com 510 MC10E211, MC100E211 Zo = 50 Q D Receiver Device Driver Device Zo = 50 Q D 50 50 VTT VTT = VCC - 2.0 V Figure 15. Typical Termination for Output Driver and Device Evaluation (See Application Note AND8020/D - Termination of ECL Logic Devices.) ORDERING INFORMATION Package Shipping MC10E221FN PLCC-28 37 Units / Rail MC10E221FNR2 PLCC-28 500 / Tape & Reel MC100E221FN PLCC-28 37 Units / Rail MC100E221FNR2 PLCC-28 500 / Tape & Reel Device For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. http://onsemi.com 511 MC10E211, MC100E211 Resource Reference of Application Notes AN1405/D - ECL Clock Distribution Techniques AN1406/D - Designing with PECL (ECL at +5.0 V) AN1503/D - ECLinPS I/O SPiCE Modeling Kit AN1504/D - Metastability and the ECLinPS Family AN1568/D - Interfacing Between LVDS and ECL AN1642/D - The ECL Translator Guide AND8001/D - Odd Number Counters Design AND8002/D - Marking and Date Codes AND8020/D - Termination of ECL Logic Devices AND8066/D - Interfacing with ECLinPS AND8090/D - AC Characteristics of ECL Devices http://onsemi.com 512