NTE7485 Integrated Circuit TTL 4Bit Magnitude Comparator Description: The NTE7485 is a 4bit magnitude comparator in a 16Lead plastic DIP type package that performs comparison of straight binary and straight BCD (8 4 2 1) codes. Three fully decoded decisions about two 4 bit words (A, B) are made and are externally available at three outputs. This device is fully expandable to any number of bits without external gates. Words of greater length may be com- pared by connecting comparators in cascade. The A > B, A < B, and A = B outputs of a stage handling lesssignificant bits are connected to the corresponding A > B, A < B, and A = B inputs of the next stage handling moresignificant bits. The stage handling the leastsignificant bits must have lowlev- el voltages applied to the A > B and A < B inputs. The cascading paths are implemented with only a twogate level delay to reduce overall comparison times for long words. 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, except interemitter voltages, are with respect to network ground terminal. Note 2. This is the voltage between two emitters of a multipleemitter input transistor. This rating ap- plies to each A input in conjunction with its respective B input. Recommended Operating Conditions: Parameter Symbol Min Typ Max Unit Supply Voltage V 4.75 5.0 5.25 V CC HighLevel Output Current I 400 A OH LowLevel Output Current I 16 mA OL Operating Temperature Range T 0 +70 C AElectrical Characteristics: (Note 3, Note 4) Parameter Symbol Test Conditions Min Typ Max Unit High Level Input Voltage V 2 V IH Low Level Input Voltage V 0.7 V IL Input Clamp Voltage V V = MIN, I = 12mA 1.5 V IK CC I High Level Output Voltage V V = MIN, V = 2V, V = 0.8V, I = -400A 2.4 3.4 V OH CC IH IL OH Low Level Output Voltage V V = MIN, V = 2V, V = 0.8V, I = 4mA 0.2 0.4 V OL CC IH IL OL Input Current I V = MAX, V = 5.5V 1 mA I CC I High Level Input Current I V = MAX, V = 2.4V IH CC I A < B, A > B Inputs 40 A All Other Inputs 120 A Low Level Input Current I V = MAX, V = 0.4V IL CC I A < B, A > B Inputs 1.6 mA All Other Inputs 4.8 mA ShortCircuit Output Current I V = MAX, V = 0, Note 5 18 55 mA OS CC O Supply Current I V = MAX, Note 6 55 88 mA CC CC Note 3. .For conditions shown as MIN or MAX, use the appropriate value specified under Recommended Operation Conditions. Note 4. All typical values are at V = 5V, T = +25C. CC A Note 5. Not more than one output should be shorted at a time. Note 6. I is measured with outputs open, A = B grounded, and all other inputs at 4.5V. CC Switching Characteristics: (V = 5V, T = +25C unless otherwise specified) CC A Number of Gate Test Parameter Symbol From Input To Output Levels Conditions Min Typ Max Unit Propagation Delay Time t Any A or B Data Input A < B, A > B 1 R = 400, 7 ns PLH L C = 15pF L 2 12 ns 3 17 26 ns A = B 4 23 35 ns Propagation Delay Time t Any A or B Data Input A < B, A > B 1 11 ns PHL 2 15 ns 3 20 30 ns A = B 4 20 30 ns Propagation Delay Time t A < B or A = B A > B 1 7 11 ns PLH Propagation Delay Time t A < B or A = B A > B 1 11 17 ns PHL Propagation Delay Time t A = B A = B 2 13 20 ns PLH Propagation Delay Time t A = B A = B 2 11 17 ns PHL Propagation Delay Time t A > B or A = B A < B 1 7 11 ns PLH Propagation Delay Time t A > B or A = B A < B 1 11 17 ns PHL