NOT RECOMMENDED FOR NEW DESIGNS LOW-POWER SY100S391 Micrel, Inc. SY100S391 HEX TTL-TO-PECL TRANSLATOR FEATURES DESCRIPTION The SY100S391 is a hex TTL-to-PECL translator for Operates from a single +5V supply converting TTL logic levels to 100K logic levels. The unique Differential PECL outputs feature of this translator is the ability to do this translation Function and pinout compatible with Fairchild F100K using only one +5V supply. The differential outputs allow Available in 28-pin PLCC packages each circuit to be used as an inverting/non-inverting translator, or as a differential line driver. A common enable (E), when LOW, holds all inverting outputs HIGH and all non-inverting inputs LOW. The SY100S391 is ideal for those mixed PECL/TTL applications which only have a +5V supply available. When used in the differential mode, the S391, due to its high BLOCK DIAGRAM common mode rejection, overcomes voltage gradients between the TTL and PECL ground systems. E Q0 D0 Q0 PIN NAMES Q1 Pin Function D1 Q1 D0 D5 Data Inputs (TTL) Q2 Q0 Q5 Data Outputs (PECL) D2 Q2 Q0 Q5 Inverting Data Outputs (PECL) E Enable Input (TTL) Q3 D3 Q3 VCCA VCCO for ECL Outputs Q4 D4 Q4 Q5 D5 Q5 Rev.: I Amendment: /0 M9999-042307 1 Issue Date: April 2007 hbwhelp micrel.com or (408) 955-1690SY100S391 Micrel, Inc. PACKAGE/ORDERING INFORMATION Ordering Information Package Operating Package Lead Part Number Type Range Marking Finish 11 10 9 8 7 6 5 D2 12 4 Q2 SY100S391JC J28-1 Commercial SY100S391JC Sn-Pb GND TTL 13 3 Q2 (1) SY100S391JCTR J28-1 Commercial SY100S391JC Sn-Pb GND PECL 14 2 VCCA Top View (2) GNDS 15 1 VCC PLCC SY100S391JZ J28-1 Commercial SY100S391JZ with Matte-Sn J28-1 GND PECL 16 28 VCC Pb-Free bar-line indicator E 17 27 Q3 (1, 2) SY100S391JZTR J28-1 Commercial SY100S391JZ with Matte-Sn D3 18 26 Q3 Pb-Free bar-line indicator 19 20 21 22 23 24 25 Notes: 1. Tape and Reel. 2. Pb-Free package is recommended for new designs. 28-Pin PLCC (J28-1) LOGIC SYMBOL TRUTH TABLE Inputs Outputs D0 D1 D2 D3 D4 D5 Dn EQn Qn HHH L E Q0 Q0 Q1 Q1 Q2 Q2 Q3 Q3 Q4 Q4 Q5 Q5 LH L H HL L H LLL H Note: 1. H = High Voltage Level, L = Low Voltage Level M9999-042307 2 hbwhelp micrel.com or (408) 955-1690 D1 D0 Q0 GNDS Q0 Q1 Q1 D4 D5 Q5 GNDS Q5 Q4 Q4