54148 (74148 8 Data Line to 3-Line Binary (Octal) Priority Encoder 167 Schottky TTL High-Speed TTL Low-Power Schottky TTL Standard TTL Low-Power TTL Package Package Package Package : Package Device Type Device Type Device Type Device Type Device Type - yp C|\P|IMICF C|}P|MICF PM ICE C|P|M{CF C}P |M CF Tl SN54148 10 way a SNTALS 148 Ni SN74148 JONG FAIRCHILD MOTOROLA DM54148 NSC. DM74148 PHILIPS N74148 0 $5448 SIGNETICS maak SIEMENS FUJITSU HITACHI HD TALS 148 Po HO 74148 ofPo MITSUBISHI M74L S148 M74148 PO NEC TOSHIBA Electrical Characteristics SN54LS148/SN74L.S 148 . : . Pin Assignment (Top View) absolute maximum ratings over operating free-air temperature range oureurs eur veg OD IT Supply voltage, Voc 7V_| Operating tree-air | SN54iS | SS'C to 125C Lleol Pal positive logic: temperature range [snrats oc to 70C Input voltage a6 see function table 3 N Storage temperature range 65C to 150C @ oe . a recommended operating conditions Soe ow NO-No interns! connection SNS4LS148 SN74LS148 UNIT Ai Te MIN NOM MAX |MIN NOM MAX z Fo Supply voltage. Voc 45 5 5.5/4.75 5 5.285] Vv meus ourburs High-level output current, !oH 400 400; vA Low-level output current, lov 4 a] mA Operating free-air temperature, Ta =58 125] 0 vik Function Table electrical characteristics over recommended operating 148 free-air temperature range INPUTS I OUTPUTS PARAMETER * TEST CONDITIONS t MIN TYP? MAX | UNIT elo ' 2 3 4 8 6 7 ja2 Ai aOlGsS EO Vi High-level input voltage 2 v HI] xX X xX KX xX x xX X/H H HIH H Vit Low-level input voitage 08] v L|H H H H H H H H/IH H HTH & vi input clamp voltage 1) =18mA -1.8] V Lix xX X xX x xX X CTL tL LIL A y Vin=2V. Lyx xX xX xX KX xX LE HILL tc HI]t oH High-level output volta: 2.7 4 v L |x OH ) pul ge ViL =0.8V. toH= 400A 3 Xx X X X LH Hit H LIL H Voc=MIN. = Vip=2V riX X XX GH AH) WH HTL H VoL Low-level output voltage ce . 4 0.35 Os! Vv LixX xX X LH H H H{H L LIL 4H Vin =0.8V. lot =8mA {|/xX X LE H H H H HIJH LC HILL H iy Input ourrent at maximum input voltage =| VCG=MAX, Vy=7V 0.2{ mA tL |X tL H H H H H HIH H LIt H High level 0 input 20 L}tL H H H H H H H]H H HIL H " Voo= Vy=2.2V 1 segut cures [Any inpat enmoptg | VOC MAX. Vin? 20) 4 Low-level 0 input 0.4 H=high logic jevel, L =Jow fogic level, X =irrelevant HL IAput current Any ingut except 0 Vec=MAX. Vi=0.aV -0.8 ma los Short-circuit output current 0 Voc =MAX -20 100) mA Functional Block Diagram Voc=MAX, | Condition | 12 20; mA | Supply current 00 ce Poly See Note 2 [Condition 2 10 7] mA tpt | from 0 thru 7 ny phase 14 (8 fe 'PHL | to output AQ,Al, or AZ output 15 2] "8 i Sos 'PLu from 0 thru 7 Qut-of-phase 20 36 *PHL | to output AO, Al, or AZ output 16 as| it aon tPLH from 0 thru 7 Out-of- phase Voo=sv. 7 (8 " IPH to output 0 output home 2 4oj a ipLH | trom @ thru 7 wave- | in-phase a . 35.58 2 1PH to output GS FORM output ee 9 2i| tpLy | from El Ine phase R= 16 25 ra TPHL | to output AO. Al,or AZ output 122} tei | from El In- phase 12 7 me, tPHL to output GS Output 14 36 ns 'PLH from El In- phage 2 2 tPH to output EO oviput 23 as} 8 NOTES: |. This 1s the voltage between (wo emitters of a multiple-emitter *ransistor For SN54148/SN74148 circuits, this rating applies between any two of the eight we, data lines, Q through 7 2. }oG (condition 1) 1s measured with inputs 7 and El grounded, other inputs and outputs open; lor (condinon 2) is measured with ail inputs and outputs open. 148 8-LINE-TO-3LINE PRIORITY ENCODER + For conditions shown as MIN or MAX. use the appropriate vaiue specified under recommended Operating conditions for the applicable device type TAI typical values are at Voc =5, T A=25C @Not more than one output should be shorted at a time #tPLH=propagation delay time, jow-to-high-level output IPHL * propayuiion deiay time, high-tu-low jevei yutput