54LS126 NSC | Alldatasheet
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3 TA National
54LS126/DM74LS126A Quad TRI-STATE® Buffers General Description This device contains four independent gates each of which —_output transistors are turned off presenting a high-imped- Performs a non-inverting buffer function. The outputs have —_ance state to the bus line. Thus the output will act neither as the TRI-STATE feature. When enabled, the outputs exhibit _a significant load nor as a driver. To minimize the possibility the low impedance characteristics of a standard LS output _that two outputs will attempt to take a common bus to oppo- with additional drive capability to permit the driving of bus __ site logic levels, the disable time is shorter than the enable lines without external resistors. When disabled, both the _ time of the outputs. SSS Connection Diagram Dual-In-Line Package Vee a a va 3 a3 v3 1 13 12 1 0 f 8 1 2 3 a . 0 7 a a a) ce a2 v2 GND TUF /6388-1 Order Number 54LS126DMQB, 54LS126FMQB, DM74LS126AM or DM74LS126AN ‘See NS Package Number M14A, N14A or W14B. Function Table Y=A La Toc J yv | L H L H H H x L Hi-Z H = High Logic Level L = Low Logic Level X = Either Low or High Logic Level Hiz = TRISTATE (Outputs are disabled) 2-140
Absolute Maximum Ratings (note) 3 If Military/Aerospace specified devices are required, Note: The “Absolute Maximum Ratings” are those values Eg 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 w parametric values defined in the “Electrical Characteristics” Input Voltage Ww 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 —58°C to + 125°C DM74LS OC to +70°C Storage Temperature Range —65°C to + 150°C Recommended Operating Conditions saLsi26 [___owzasizca | Veo Supply Voltage Pes | os | ss [ 475 [os [sas |v im High Level Input Voltage a Vi Low Level Input Voltage a 2 lon High Level Qutputcurent | Ta TT 26 [ma to LowLevelOutputCurent | TT ee ma Ta FreeAirOperating Temperate | -ss [ [zs [oo [| [| 7 | Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Mi Veo = Min, = =18mA ee ee ee Von High Level Output Voc = Min, lox = Max 24 v Voltage Vin = Min ° Vou Low Level Output Voo=Minio.=Max [ sas | [| [oa | | tu =temVvoo=win [| os oa | \\ Input Current @ Max Voc = Max, Vj = 10V (54LS) mA Input Voltage Vi = 7V (DM74) ta High Level input Current | Voc = Max, Vi = 2.7V es ee ee Ie Low Level Input Voc = Max, V; = 0.4V mA Current lozH Off-State Output Current Voc = Max, Vo = 2.4V with High Level Output Vin = Min, Vi, = Max pA Voltage Applied loz Off-State Output Current | Voc = Max, Vo = 0.4V with Low Level Output Vin = Min, Vi, = Max pA Vottage Applied los Short Greuit Voo = Max [sas | -s0 [| -130 [Sy loo Supply Current Voo=MaxiNotes) | owe | | ta | 2 [ma loo.__|__ Supply Current [uso sas [Te ima 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 nat exceed one second. Note 3: Ioc is measured with both the output contro! and data inputs grounded, 2-141
s S| Switching Characteristics at voc = 5v and T, = 25°C (See Section 1 for Test Waveforms and Output Load) 1PLH Propagation Delay Time Low ns to High Level Output tPHL Propagation Delay Time High 18 ns to Low Level Output tpzH Output Enable Time to ns High Level Output tezi Output Enable Time to 42 ns Low Level Output tpHz Output Disable Time from ns High Level Output (Note 1) teiz Output Disable Time from ns Low Level Output (Note 1) Note 1: C, = SpF. 2-142