54LS112 NSC | Alldatasheet
Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 3
Technical content
. o National = Semiconductor * Dual Negative-Edge-Triggered Master-Slave J-K Flip-Flops with Preset, Clear, and Complementary Outputs General Description This device contains two independent negative-edge-trig- violated. A low logic level on the preset or clear inputs will gered J-K flip-flops with complementary outputs. The J and _ set or reset the outputs regardless of the logic levels of the K data is processed by the flip-flop on the falling edge of the —_ other inputs. clock pulse. The clock triggering occurs at a voltage level and is not diractly related to the transition time of the falling Features edge of the clock pulse. Data on the J and K inputs may be w Aitemate Military/Aerospace device (54LS112) is avail- changed while the clock is high or low without affecting the able. Contact a National Semiconductor Sales Office/ outputs as long as the setup and hold times are not Distributor for specifications. or Connection Diagram Function Table 16 15 14 ted 12 WW iL Ll L H x x x H L H L x x | Xx L H L L x xX | xX | He Ht H H Ll L} Lb} a H H L H] UL] H L H H t tL} H L H H H L HI] H Toggle H H H x X | A H = High Logic Level L = Low Logic Level X = Either Low or High Logie Level 1 2 3 4 5 G 7 8 4 = Negative Going Edge of Pulse = o * = This configuration is nonstable; that is, it will not Persist when preset CuK Kt a” pat ar a @ GNo ‘and/or clear inputs return to their inactive (high) level. TL/F/6382-1 Qo = The output logic level before the indicated input conditions were es- ‘Order Number 54LS112DMQB, 54LS112FMQB, tablished, 54LS112LMQB, DMS54LS112AJ, DM54LS112AW, Toggle = Each output changes to the complement ofits previous level on DM74LS112AM or DM74LS112AN ‘ach falling edge of the clock putes. See NS Package Number E20A, J1GA, M16A, NIGE or W16A 2-119
N =| Absolute Maximum Ratings (note) ba} 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 ~v parametric values defined in the “Electrical Characteristics” Input Volta wv table are not guaranteed at the absolute maximum ratings. oe ting Cree Ai The “Recommended Operating Conditions” table wil define Operating Free Air Temperature Range the conditions for actual device operation. DMS4LS and 54LS —55°Cto + 125°C DM74LS O°C to +70°C Storage Temperature Range —65°C to +150°C Recommended Operating Conditions Symbol Parmer masa | wrist | Units [min [Nom [ max [min | Nom | Max | Voo | Supplyvotage | as | | ss | ars | 5 | 525 |v ton | HightovelOutputGurent | | | oe fT 04 Toma lor | towteverOutpurcurent TTT TT Tm foux _| Glock Frequency Notes) | oo | | as | Tas | w Pusewieth —|_GlockHigh | 20 | | fT wo TT (note?) | Presettow | 25 [| ff as PTs | Garrow | as [Tf as TT w Pusewieth | Crock ign | 2s | TT as TT (otes) | Presottow | so [| [| [| wo | fos | ceartow | 3 [ of fo | ft ty | HoldTimeotestanaay | ot [Tf ot PTs tw | Hold Time Notes tana) [sy | | | st] |_| rs Note 1: The symbol ( |) indicates the falling edge of the clock pulse is used for reference. Note 2: G, = 15 pF, R= 2kN, Ta = 25°C and Voc = 5V. Note 3: O. = 50 pF, RL = 2kM, Ta = 25°C and Voc = SV. Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) w__| imputclamp vonage | Voo=Min=-1ema || Tt |v Vou High Level Output | Voo=Minion= Max | mes [25 [34 [fy [loc = 4k Vog= win | owra_[ | 028 | 04 _| i InputCurrent@Mex | Vog=Mexvi=7v [| sk [| Tot | [ Preset | | oa | | cock | | os | 2-120
Electrical Characteristics = over recommended operating free air temperature range (unless otherwise noted) (Continued) b tu High LevelinputCurent | Voc=Max.vi=27v [ wk | [| a0 | | cee [ [fo | In LowLevelinputCurent | Voc=Mavi=oav | ak | fT | —o4 | | clear [| oe | ag | Preset | [| =o | loc Supply Current Vog = Max (Note 3) a Switching Characteristics atvco = sv and Ta = 25°C (See Section 1 for Test Waveforms and Output Load) Symbol Parameter Toroupay {= *8eF | G.=S0pF__| Units eee ite Twa [ nw] tPLH Propagation Delay Time Preset 24 ns Low to High Level Output toQ tPHL Propagation Delay Time Preset 20 ns High to Low Level Output tod tPLH Propagation Delay Time Clear 24 ns Low to High Level Output tod tPHL Propagation Delay Time Clear ns High to Low Level Output toQ tPLH Propagation Delay Time Clock to 24 ns Low to High Level Output QorQ tPHL Propagation Delay Time Clock to 20 ns High to Low Level Output Qord 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 exceed one second. For devices, with feedback from the outputs, where shorting the outputs to ground may cause the outputs to change logic state an equivalent test may be Performed where Vo = 2.25V and 2.125V for DM54 and M74 series, respectively, with the minimum and maximum iimits reduced by one half from their stated values. This is very useful when using automatic test ‘equipment. Note 3: With all outputs open, icc is measured with the Q and © outputs high in tum. At the time of measurement the clock is grounded. 2-121