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| 3.3V DIFFERENTIAL LVPECL-to-LVTTL TRANSLATOR FEATURES s s s s s s s 3.3V power supply 2.0ns typical propagation delay Low power Differential LVPECL inputs 24mA TTL outputs Flow-through pinouts Available in 8-pin SOIC package ClockWorksTM SY10ELT21L SY100ELT21L DESCRIPTION The SY10/100ELT21L are single differential LVPECLto-LVTTL translators using a single +3.3V power supply. Because LVPECL (Low Voltage Positive ECL) levels are used, only +3.3V and ground are required. The small outline 8-lead SOIC package and low skew single gate design make the ELT21L ideal for applications that require the translation of a clock or data signal where minimal space, low power, and low cost are critical. VBB allows a differential, single-ended, or AC-coupled interface to the device. If used, the VBB output should be bypassed to VCC with 0.01F capacitor. Under open input conditions, the /D will be biased at a VCC/2 voltage level and the D input will be pulled to ground. This condition will force the Q output low to provide added stability. The ELT21L is available in both ECL standards: the 10ELT is compatible with positive ECL 10H logic levels, while the 100ELT is compatible with positive ECL 100K logic levels. PIN CONFIGURATION/BLOCK DIAGRAM PIN NAMES Pin Function TTL Output Differential LVPECL Inputs +3.3V Supply Reference Output Ground NC 1 D2 PECL TTL 8 VCC 7Q 6 NC 5 GND Q D, /D VCC VBB GND D3 VBB 4 Rev.: B Amendment: /0 1 Issue Date: April 2000 Micrel ClockWorksTM SY10ELT21L SY100ELT21L ABSOLUTE MAXIMUM RATINGS(1) Symbol VCC VI VO IO Tstore TA Paramter Power Supply Voltage PECL Input Voltage Voltage Applied to Output at HIGH State Current Applied to Output at LOW State Storage Temperature Operating Temperature Value -0.5 to +3.8 0V to VCC+0.5 -0.5 to VCC Twice the Rated IOL -65 to +150 -40 to +85 Unit V V V mA C C TRUTH TABLE D L H Open /D H L Open Q L H L NOTE: 1. Permanent device damage may occur if ABSOLUTE MAXIMUM RATINGS are exceeded. This is a stress rating only and functional operation is not implied at conditions other than those detailed in the operational sections of this data sheet. Exposure to ABSOLUTE MAXIMUM RATlNG conditions for extended periods may affect device reliability. TTL DC ELECTRICAL CHARACTERISTICS VCC = +3.3V 5% TA = -40C Symbol IOS ICC VOH VOL Parameter Output Short Circuit Current Power Supply Current Output HIGH Voltage Output LOW Voltage Min. -80 -- 2.0 -- Max. -275 20 -- 0.5 TA = 0C Min. -80 -- 2.0 -- Max. -275 20 -- 0.5 TA = +25C Min. -80 -- 2.0 -- Typ. -- 14 -- -- Max. -275 20 -- 0.5 TA = +85C Min. -80 -- 2.0 -- Max. -275 20 -- 0.5 Unit mA mA V V IOH = -3.0mA IOL = 24mA Condition VOUT = 0V PECL DC ELECTRICAL CHARACTERISTICS VCC = +3.3V 5% TA = -40C Symbol IIH IIL VIH VIL VBB Parameter Input HIGH Current Input LOW Current D /D Min. -- 0.5 -300 2070 2135 1350 1490 1870 1920 Max. 150 -- -- 2410 2420 1800 1825 2000 2040 TA = 0C Min. -- 0.5 -300 2130 2135 1350 1490 1920 1920 Max. 150 -- -- 2460 2420 1820 1825 2030 2040 TA = +25C Min. -- 0.5 -300 2170 2135 1350 1490 1950 1920 Typ. -- -- -- -- -- -- -- 2000 1980 Max. 150 -- -- 2490 2420 1820 1825 2050 2040 TA = +85C Min. -- 0.5 -300 2240 2135 1350 1490 1990 1920 Max. 150 -- -- 2580 2420 1855 1825 2110 2040 Unit A A mV mV mV Condition Input HIGH Voltage(2) 10ELT 100ELT Input LOW Voltage(2) Reference Output(2) 10ELT 100ELT 10ELT 100ELT NOTES: 1. These values are for VCC = 3.3V. Level Specifications will vary 1:1 VCC. 2 Micrel ClockWorksTM SY10ELT21L SY100ELT21L AC ELECTRICAL CHARACTERISTICS VCC = +3.3V 5% TA = -40C Symbol tPLH tPHL tskpp fMAX VCMR VPP tr tf Parameter Propagation Delay Part-to-Part Skew(1,2) Maximum Input Frequency(2,3,4) Min. 1.5 -- 275 1.2 100 0.5 Max. 2.5 0.5 -- VCC -- 1.0 TA = 0C Min. 1.5 -- 275 1.2 100 0.5 Max. 2.5 0.5 -- VCC -- 1.0 TA = +25C Min. 1.5 -- 275 1.2 100 0.5 Typ. 2.0 -- -- -- -- -- Max. 2.5 0.5 -- VCC -- 1.0 TA = +85C Min. 1.5 -- 275 1.2 100 0.5 Max. 2.5 0.5 -- VCC -- 1.0 Unit ns ns MHz V mV ns CL = 20pF Condition CL = 20pF CL = 20pF CL = 20pF Common Mode Range Minimum Peak-to-Peak Input(5) Output Rise/Fall Time (1.0V to 2.0V) NOTES: 1. Part-to-Part Skew considering HIGH-to-HIGH transitions at common VCC level. 2. These parameters are guaranteed but not tested. 3. Frequency at which output levels will meet a 0.8V to 2.0V minimum swing. 4. The fMAX value is specified as the minimum guaranteed maximum frequency. Actual operational maximum frequency may be greater. 5. 100mV input guarantees full logic at output. PRODUCT ORDERING CODE Ordering Code SY10ELT21LZC SY10ELT21LZCTR SY100ELT21LZC SY100ELT21LZCTR Package Type Z8-1 Z8-1 Z8-1 Z8-1 Operating Range Commercial Commercial Commercial Commercial VCC Range (V) +3.3V 5% +3.3V 5% +3.3V 5% +3.3V 5% 3 Micrel ClockWorksTM SY10ELT21L SY100ELT21L 8 LEAD SOIC .150" WIDE (Z8-1) Rev. 03 MICREL-SYNERGY TEL 3250 SCOTT BOULEVARD SANTA CLARA CA 95054 USA FAX + 1 (408) 980-9191 + 1 (408) 914-7878 WEB http://www.micrel.com This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc. (c) 2000 Micrel Incorporated 4 |
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