======================================================================== 74F537 1-OF-10 DECODER (3-STATE OUTPUTS) ======================================================================== Family: Fairchild FAST (Advanced Schottky TTL) Source: 1980 Fairchild FAST Data Book, pages 4-112 ... 4-114 Status: PRELIMINARY -- page 4-112 carries a "Preliminary" watermark. Ratings: Vcc = +5.0 V +/-5%, TA = 0 to +70 deg C DESCRIPTION ----------- The 'F537 is a one-of-ten decoder/demultiplexer with four active-HIGH BCD inputs and ten mutually exclusive outputs. A polarity control input determines whether the outputs are active-LOW or active-HIGH. The 'F537 has 3-state outputs, and a HIGH signal on the Output Enable (/OE) input forces all outputs to the high impedance state. Two input enables, active-HIGH E2 and active-LOW /E1, are available for demultiplexing data to the selected output in either non-inverted or inverted form. Input codes greater than BCD nine cause all outputs to go to the inactive state (i.e., same polarity as the P input). CONNECTION DIAGRAM (20-pin DIP) ------------------------------- Pin Function Pin Function --- ------------------------------- --- ------------------------------- 1 O2 Output 2 20 Vcc 2 O1 Output 1 19 O3 Output 3 3 O0 Output 0 18 O4 Output 4 4 P Polarity Control input 17 A3 Address input 3 5 /OE Output Enable (active LOW) 16 A2 Address input 2 6 A0 Address input 0 15 /E1 Enable input (active LOW) 7 A1 Address input 1 14 E2 Enable input (active HIGH) 8 O5 Output 5 13 O9 Output 9 9 O6 Output 6 12 O8 Output 8 10 GND 11 O7 Output 7 TRUTH TABLE ----------- H = HIGH voltage level; L = LOW voltage level; X = immaterial; Z = high impedance state. Function /OE /E1 E2 A3 A2 A1 A0 O0 O1 O2 O3 O4 O5 O6 O7 O8 O9 -------------- --- --- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- High Impedance H X X X X X X Z Z Z Z Z Z Z Z Z Z Disable L H X X X X X Outputs Equal P Input Disable L X L X X X X Outputs Equal P Input Active-HIGH L L H L L L L H L L L L L L L L L Output L L H L L L H L H L L L L L L L L (P = L) L L H L L H L L L H L L L L L L L L L H L L H H L L L H L L L L L L L L H L H L L L L L L H L L L L L L L H L H L H L L L L L H L L L L L L H L H H L L L L L L L H L L L L L H L H H H L L L L L L L H L L L L H H L L L L L L L L L L L H L L L H H L L H L L L L L L L L L H L L H H X H X L L L L L L L L L L L L H H H X X L L L L L L L L L L Active-LOW L L H L L L L L H H H H H H H H H Output L L H L L L H H L H H H H H H H H (P = H) L L H L L H L H H L H H H H H H H L L H L L H H H H H L H H H H H H L L H L H L L H H H H L H H H H H L L H L H L H H H H H H L H H H H L L H L H H L H H H H H H L H H H L L H L H H H H H H H H H H L H H L L H H L L L H H H H H H H H L H L L H H L L H H H H H H H H H H L L L H H X H X H H H H H H H H H H L L H H H X X H H H H H H H H H H INPUT LOADING / FAN-OUT ----------------------- Pin Names Description U.L. HIGH/LOW ----------- -------------------------------- ------------- A0 - A3 Address Inputs 0.5 / 0.375 /E1 Enable Input (Active LOW) 0.5 / 0.375 E2 Enable Input (Active HIGH) 0.5 / 0.375 /OE Output Enable Input (Active LOW) 0.5 / 0.375 P Polarity Control Input 0.5 / 0.375 O0 - O9 3-State Outputs 25 / 12.5 DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE --------------------------------------------------- Symbol Parameter Min Typ Max Units ------ -------------------------------------- --- --- --- ----- ICC Power Supply Current (All Outputs OFF) 44 mA Conditions: A0 - A3, /E1 = Gnd; /OE, E2, P = HIGH. AC CHARACTERISTICS ------------------ Symbol Parameter Min Typ Max Units ------ --------------------------------- --- ---- --- ----- tPLH Propagation Delay An to On -- 12.5 -- ns tPHL Propagation Delay An to On -- 11.5 -- ns tPLH Propagation Delay /E1 to On -- 11.5 -- ns tPHL Propagation Delay /E1 to On -- 11 -- ns tPLH Propagation Delay E2 to On -- 14 -- ns tPHL Propagation Delay E2 to On -- 14.5 -- ns tPLH Propagation Delay P to On -- 13 -- ns tPHL Propagation Delay P to On -- 12 -- ns tPZH Output Enable Time /OE to On -- 5.0 -- ns tPZL Output Enable Time /OE to On -- 5.5 -- ns tPHZ Output Disable Time (1) /OE to On -- 5.0 -- ns tPLZ Output Disable Time (1) /OE to On -- 5.0 -- ns (1) Disable times measured with CL = 5.0 pF.