LS248 NSC | Alldatasheet
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54LS248/DM74LS248 BCD to 7-Segment Decoder (with 2 kO Pull-Up Resistors) General Description The 'LS248 has active HIGH outputs with internal 2 k®. pull- up resistors. It has the same electrical characteristics and pin connections as the 'LS48. The only difference is that the °LS248 will light the top bar (segment a) for numeral 6 and the bottom bar (segment d) for numeral 9. For detailed de- scription and specifications please refer to the ’LS48 data sheet. eee Connection Diagram Logic Symbol Dual-In-Line Package 712635 eRe) Aim 16 F-Voc AO AT AZ AS LT RB A242 1st v3 1h4beg B7RBO 4 4 13b-a 8/ Reis 12;—b abcde f g RBO B46 tie °) 47 10fed 13.12 1110 9 15 14 4 owe she TUF10181-2 Voc = Pin 16 TUF/10181-1 GND = Pin 8 Order Number 54LS248DMQB, 54LS248FMQB, DM74LS248M or DM74LS248N See NS Package Number J16A, M16A, N16E or W16A [ Pinnames [Description | A0-A3 BCD Inputs. RBI Ripple Blanking Input (Active LOW) tr Lamp Test Input (Active LOW) BI7RBO Blanking Input (Active LOW) or Ripple Blanking Output (Active LOW) a-g Segment Outputs (Active HIGH) 2-279
a Absolute Maximum Ratings (note) If Military/Aerospace specified devices are required, Note: The “Absolute Maximum Ratings” are those values Please contact the National Semiconductor Sales beyond which the safety of the device cannot be guaran- Office/Distributors for availability and specifications. teed. The device should not be operated at these limits. The Supply Voltage VV parametric values defined in the “Electrical Characteristics” Input Voltage "VV table are not guaranteed at the absolute maximum ratings. . . The “Recommended Operating Conditions” table will define Operating Free Air Temperature Range the conditions for actual device operation. 54LS — 55°C to + 126°C DM74LS O°C to +70°C Storage Temperature Range —65°C to + 150°C Recommended Operating Conditions Smet Pome ee ow“ Vec___| Supply Votage Jes [ s [ ss [a | 5 [| sa |v im HighLovelinputvotage [2 | | Te | TT Vi Low Love input Votage a a lon HighLevelouputvotage ||| on [TT on [ma lot LowLevelOuipurcurent | | | 2 TT ma Ts FreeAirOperating Temperature | -s5 | | 1s | o [| | 7m | Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Typ Symbol ee ee (Note 1) Unite vs InputClampVolage | Vog=Minu=-18ma || as [ov Vou High Level Output Voltage | Voc=Min.ion=Max [sas | 24 | | | v Vor | towteveldutputvotage | Voo=Minion= Mex | sas [ [| oa | [iec= sama ver= wn [owe || | oa _| I Input Current @ Max Voc = Max, Vj = 10V o4 mA Input Voltage los | Short Greuit Voo = Max [sas [-o3 [| -20] |, lore Segment inputs, Vo = 0.85V [-13[ | Note 1: All typicals aro at Voc = 5V, Ta = 25°C. Note 2: Not more than one output should be shorted at a time, and the duration should not exceed one second. 2-280
Switching Characteristics IN Voc = +5.0V, Ta = +25°C (See Section 1 for waveforms and load Configurations) o tL Propagation Delay Time 100 ns Low to High Level Output tPHL Propagation Delay Time ns High to Low Level Output 2-281