93L21 NSC | Alldatasheet
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N pat - % A National Dual 1-of-4 Decoder General Description Features The 93121 consists of two independent multipurpose de- @ Multifunction capability coders, each designed to accept two inputs and provide @ Mutually exclusive outputs four mutually exclusive outputs. In addition an active LOW ™ Demultiplexing capability enable input, which gives demultiplexing capability, is pro- ™ Active low enable for each decoder vided for each decoder. Connection Diagram Logic Symbol 1 2 3 15 14 13 Duatin-Line Package re O . a, — AO. Al — AO AT fai 16 Veg hood? 15 ib DECODER a DECODER b Ae ‘4p ao 00 01 02 03 00 01 02 05 00a =] 4 13-Atb oo oo oT ot oo Os 12F-00b dzaf6 Wo 4.5 6 7 12 11 10 9 ase47 tol-dap TULF /10197-2 x Veo = Pin 16 cno—78 977 03> GND ~ Pine TUF/10197-+ Order Number 93L21DMQB or 93L21FMQB See NS Package Number J16A or W16A [_Finwames | Description Ea, Eb Enable Inputs (Active LOW) AOa, Ata, AQb, Alb | Address Inputs Soa-S3a } . G0b-O3b Decoder Outputs (Active LOW) 5-56
Absolute Maximum Ratings (note) & lf 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 avaitability and specifications. teed. The device should not be operated at these limits. The Supply Voltage vy parametric values defined in the “Electrical Characteristics” Input Voltage 5.5V table are not guaranteed at the absolute maximum ratings. ‘oltage ‘ The “Recommended Operating Conditions” table will define Operating Free Air Temperature Range the conditions for actual device operation. MIL —5§°C to + 125°C Storage Temperature Range —65°C to + 150°C Recommended Operating Conditions Voc Supply Voltage a Vin High Level Input v Voltage Vit Low Level Input Voltage o7 v i Low eve Oupucunens | | +d | ma Electrical Characteristics over recommended operating free air temperature (unless otherwise noted) Typ Syme | rwamaer | conatone |_| (Note 1) vmne M Inputciampvotiage | Vog=mint=—ioma [| [Tas |v Vou High Level Output Voc = Min, lon = Max, v Voltage Vit = Max, Viq = Min Vor Low Level Output Voc = Min, to. = Max, v Voltage Vin = Min, Vi, = Max fT Input Current @ Max Voc = Max, = 5.5V mA Input Voltage pA Current Ii Low Level Input Voc = Max, V; = 0.3V Current BA los Short Circuit Voc = Max _ Output Current (Note 2) 28 mA loo Supply Curent Veo=axinotes) | | Tt [ma Note 1: All typicals are at Voc = 5V, Ta = 25°C. Note 2: Not more than one output should be shorted at a time, and the duration should not excead one second. Note 3: Ioc is measured with all outputs open and all inputs grounded. 5-57
N #j| Functional Description Truth Table (Each Decoder) signed to accept two binary weighted inputs and provide four mutually exclusive active LOW outputs as shown in the [= ao a1 | Oo 1 2 03 logic symbol. Each decoder can be used as a 4-output de- L L L L H H H tiplexer by using the enable as a data input. fauitiplener by using P L H L H L H H L L H H H L H L H H H H H L H x x H H H H H = HIGH Voltage Level L = LOW Voltage Level X = tmmaterial Logic Diagram ‘O0e ‘Sob Ade Ste ‘AQb O1b Ma ze Atb O2b 03a 53 Ea tb TUFN0107-3 Switching Characteristics Voc = +5.0v, Ta = +25°C (See Section 1 for test waveforms and output load.) Smee eee tPLH Propagation Delay ns tPHL AntoOn tPLH Propagation Delay ns {PHL EntoOn 5-58