MC100EL38DW

MC100EL38 5V ECL ÷2, ÷4/6 Clock Generation Chip The MC100EL38 is a low skew ÷2, ÷4/6 clock generation chip designed explicitly for low skew clock generation applications. The internal dividers are synchronous to each other, therefore, the common output edges are all precisely aligned. The device can be driven by http://onsemi.com either a differential or single-ended ECL or, if positive power supplies are used, PECL input signal. 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 mF capacitor and limit current sourcing or sinking SO−20 WB to 0.5 mA. When not used, VBB should be left open. DW SUFFIX CASE 751D The common enable (EN) is synchronous so that the internal dividers will only be enabled/disabled when the internal clock is already in the LOW state. This avoids any chance of generating a runt MARKING DIAGRAM* clock pulse on the internal clock when the device is enabled/disabled as can happen with an asynchronous control. An internal runt pulse 20 could lead to losing synchronization between the internal divider stages. The internal enable flip−flop is clocked on the falling edge of the input clock, therefore, all associated specification limits are 100EL38 AWLYYWWG referenced to the negative edge of the clock input. The Phase_Out output will go HIGH for one clock cycle whenever the ÷2 and the ÷4/6 outputs are both transitioning from a LOW to a 1 HIGH. This output allows for clock synchronization within the system. Upon startup, the internal flip-flops will attain a random state; A = Assembly Location therefore, for systems which utilize multiple EL38s, the master reset WL = Wafer Lot YY = Year (MR) input must be asserted to ensure synchronization. For systems WW = Work Week which only use one EL38, the MR pin need not be exercised as the G = Pb−Free Package internal divider design ensures synchronization between the ÷2 and the ÷4/6 outputs of a single device. *For additional marking information, refer to • 50 ps Output-to-Output Skew Application Note AND8002/D. • Synchronous Enable/Disable • Master Reset for Synchronization ORDERING INFORMATION • ESD Protection: > 2 kV Human Body Model, See detailed ordering and shipping information in the package > 100 V Machine Model dimensions section on page 6 of this data sheet. • The 100 Series Contains Temperature Compensation • PECL Mode Operating Range: VCC = 4.2 V to 5.7 V • Moisture Sensitivity Pb = Level 1 with VEE = 0 V Pb−Free = Level 3 For Additional Information, see Application Note • NECL Mode Operating Range: VCC = 0 V with AND8003/D VEE = −4.2 V to −5.7 V • Flammability Rating: UL 94 V−0 @ 0.125 in, • Internal 75 kW Input Pulldown Resistors on CLK, EN, Oxygen Index: 28 to 34 MR, and DIVSEL • Transistor Count = 388 devices • Q Output will Default LOW with Inputs Open or at • Pb−Free Packages are Available* VEE • Meets or Exceeds JEDEC Spec EIA/JESD78 IC Latchup Test *For additional information on our Pb−Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. © Semiconductor Components Industries, LLC, 2008 November, 2008 − Rev. 8 1 Publication Order Number: MC100EL38/D MC100EL38 VCC Q0 Q0 Q1 Q1 Q2 Q2 Q3 Q3 VEE 20 19 18 17 16 15 14 13 12 11 1 2 3 4 5 6 7 8 9 10 CLK VBB MR VCC EN DIV_SEL CLK VCC Phase_Out Phase_Out * All VCC pins are tied together on the die. Warning: All VCC and VEE pins must be externally connected to Power Supply to guarantee proper operation. Figure 1. Pinout Assignment (Top View) Q0 CLK P2 CLK R Q0 Q1 Q1 Q2 EN R P4/6 Q2 R Q3 MR Q3 DIVSEL PHASE_OUT Phase Out R Logic PHASE_OUT Figure 2. Logic Diagram Table 1. PIN DESCRIPTION Pin Table 2. FUNCTION TABLE Function CLK, CLK ECL Diff Clock Inputs Q0, Q1; Q0, Q1 ECL Diff ÷2 Outputs Q2, Q3; Q2, Q3 ECL Diff ÷4/6 Outputs EN ECL Sync Enable Input MR ECL Master Reset Input DIVSEL ECL Frequency Select Input Phase_Out, Phase_Out ECL Phase Sync Diff. Signal Output VBB Reference Voltage Output VCC Positive Supply VEE Negative Supply CLK EN MR Z ZZ X L H X L L H Function Divide Hold Q0−3 Reset Q0−3 Z = Low-to-High Transition ZZ = High-to-Low Transition X = Don’t Care DIVSEL L H http://onsemi.com 2 Q2, Q3 OUTPUTS Divide by 4 Divide by 6 MC100EL38 Table 3. MAXIMUM RATINGS Symbol Rating Unit VCC PECL Mode Power Supply Parameter VEE = 0 V Condition 1 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 −40 to +85 °C Tstg Storage Temperature Range −65 to +150 °C qJA Thermal Resistance (Junction−to−Ambient) 0 lfpm 500 lfpm SOIC−20 SOIC−20 90 60 °C/W °C/W qJC Thermal Resistance (Junction−to−Case) Standard Board SOIC−20 30 to 35 °C/W Tsol Wave Solder