NTE74176 NTE

NTE74176 Integrated Circuit TTL 35Mhz Presettable Decade Counter/Latch Description: The NTE74176 is a highspeed monolithic counter in a 14Lead plastic DIP type package consisting of four DC coupled master slave flip flops which are internally interconnected to provide a divide bytwo and a dividebyfive counter. This device is fully programmable that is, the outputs may be preset to any state by placing a low on the count/load input and entering the desired data at the data inputs. The outputs will change to agree with the data inputs independent of the state of the clocks. The NTE74176 may also be used as a 4 bit latch bu using the count/load input as the strobe and entering data at the data inputs. The outputs will directly follow the data inputs when the count/load is low, but will remain unchanged when the count/load is high and the clock inputs are active. This high speed counter will accept count frequencies of 0 to 35Mhz at the clock 1 input and 0 to 17.5Mhz at the clock2 input. During the count operation, transfer of information to the outputs occurs on the negativegoing edge of the clock pulse. The counter features a direct clear which, when taken low, sets all outputs low regardless of the state of the clocks. All inputs are diodeclamped to minimize transmissionline effects and simplify system design. The circuit is compatible with most TTL logic families and typical power dissipation is 150mW. Features: Reduced Power Version of the NTE74196 50Mhz Counter Performs BCD, Bi Quinary, or Binary Counting Fully Programmable Fully Independent Clear Input Guaranteed to Count at Input Frequencies from 0 to 35Mhz Input Clamping Diodes Simplify System Design Absolute Maximum Ratings: (Note 1) Supply Voltage, V ................................................................. 7V CC Input Voltage, V ................................................................. 5.5V IN Interemitter Voltage (Note 2) ........................................................ 5.5V Operating Temperature Range, T ............................................ 0 C to +70 C A Storage Temperature Range, T ........................................ 65C to +150 C stg Note 1. Voltage values are with respect to network ground terminal. Note 2. This is the voltage between two emitters of a multipleemitter transistor. For this circuit, this rating applies between the clear and count/load inputs.Recommended Operating Conditions: Parameter Symbol Min Typ Max Unit Supply Voltage V 4.75 5.0 5.25 V CC HighLevel Output Current I 800 A OH LowLevel Input Voltage V 0.8 V OL Count Frequency f max Clock1 Input 0 35 MHz Clock2 Input 0 17.5 MHz Pulse Width t w Clock1 Input 14 ns Clock2 Input 28 ns Clear 20 ns Load 25 ns Input Hold Time t h HighLevel Data t ns w(load) LowLevel Data t ns w(load) Input Setup Time t su HighLevel Data 15 ns LowLevel Data 20 ns Count Enable Time (Note 3) t 25 ns enable Operating Temperature Range T 0 +70 C A Note 3. Minimum count enable time is the interval immediately preceding the negativegoing edge of the clock pulse during which interval the count/load and clear inputs must both be high to ensure counting. Electrical Characteristics: (Note 4, Note 5) Parameter Symbol Test Conditions Min Typ Max Unit HighLevel Input Voltage V 2 V IH LowLevel Input Voltage V 0.8 V IL Input Clamp Voltage V V = MIN, I = 12mA 1.5 V IK CC I HighLevel Output Voltage V V = MIN, V = 2V, V = 0.8V, I = -800A 2.4 3.4 V OH CC IH IL OH LowLevel Output Voltage V V = MIN, V = 2V, V = 0.8V, 0.2 0.4 V OL CC IH IL I = 16mA, Note 6 OL Input Current I V = MAX, V = 5.5V 1 mA I CC I HighLevel Input Current I IH Data, Count/Load V = MAX, V = 2.4V 40 A CC I Clear, Clock 1 80 A Clock 2 120 A Note 4. .For conditions shown as MIN or MAX, use the appropriate value specified under Recommended Operation Conditions. Note 5. All typical values are at V = 5V, T = +25C. CC A Note 6. Q outputs are tested at I n = 16mA plus the limit value of I for the clock2 input. This A OL IL permits driving the clock2 while fanning out to 10 Series 74 loads.