SN74HC390N

XBLW SN74HC/HCT390 Dual Decade Ripple Counter General Description The SN74HC/HCT390 is a dual 4-bit decade ripple counter divided into four separately clocked sections. The counters have two divide-by-2 sections and two divide-by-5 sections. These sections share an asynchronous master reset input (nMR) and can be used in a BCD decade or bi-quinary configuration. If master reset inputs 1MR and 2MR are used to clear all 8 bits of the counter simultaneously, numerous counting configurations are possible within one package. Section clocks n CP 0 and n CP 1 , allow ripple counter or frequency division applications of divide-by-2, 4, 5, 10, 20, 25, 50 or 100. The HIGH to LOW transition of the clock inputs n CP 0 and n CP 1 trigger each section. For BCD decade operation, the nQ0 output is connected to the n CP 1 input of the divide-by-5 section. For bi-quinary decade operation, thenQ3 output is connected to the n CP 0 input and nQ0 becomes the decade output. A HIGH on the nMR input overrides the clocks and sets the four outputs LOW. Inputs include clamp diodes. It enables the use of current limiting resistors to interface inputs to voltages in excess of VCC. Features  Input levels: For SN74HC390: CMOS level For SN74HCT390: TTL level  Two BCD decade or bi-quinary counters  One device can be configured to divide-by-2, 4, 5, 10, 20, 25, 50 or 100  Two master reset inputs to clear each decade counter individually  Specified from -40℃ to +125℃  Packaging information: DIP16/SOP16/TSSOP16 Ordering Information Product Model XBLW SN74HC390N XBLW SN74HC390DTR XBLW SN74HC390TDTR XBLW SN74HCT390N XBLW SN74HCT390DTR XBLW SN74HCT390TDTR Package Type DIP-16 SOP-16 TSSOP-16 DIP-16 SOP-16 TSSOP-16 Marking 74HC390N 74HC390 74HC390 74HCT390N 74HCT390 74HCT390 Packing Tube Tape Tape Tube Tape Tape Packing Qty 1000Pcs/Box 2500Pcs/Reel 3000Pcs/Reel 1000Pcs/Box 2500Pcs/Reel 3000Pcs/Reel Block Diagram And Pin Description Block Diagram XBLWversion1.0 www.xinboleic.com Technical Support:4009682003 1 / 17 XBLW SN74HC/HCT390 Dual Decade Ripple Counter Figure 1. Logic symbol Figure 2. Logic diagram (one counter) Pin Configurations XBLWversion1.0 www.xinboleic.com Technical Support:4009682003 2 / 17 XBLW SN74HC/HCT390 Dual Decade Ripple Counter Pin Description Pin No. 1 Pin Name 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 1CP 0 1MR 1Q0 Description clock input divide-by-2 section (HIGH-to-LOW; edge-triggered) asynchronous master reset input (active HIGH) flip-flop outputs 1CP1 1Q1 1Q2 1Q3 GND 2Q3 2Q2 2Q1 clock input divide-by-5 section (HIGH-to-LOW; edge-triggered) flip-flop outputs flip-flop outputs flip-flop outputs ground (0V) flip-flop outputs flip-flop outputs flip-flop outputs 2CP1 2Q0 2MR clock input divide-by-5 section (HIGH-to-LOW; edge-triggered) flip-flop outputs asynchronous master reset input (active HIGH) 2CP 0 VCC clock input divide-by-2 section (HIGH-to-LOW; edge-triggered) supply voltage Function Table 1 BCD Count Sequence Output nQ0 nQ1 0 L L 1 H L 2 L H 3 H H 4 L L 5 H L 6 L H 7 H H 8 L L 9 H L Note: Output nQ0 connected to n CP1 ; counter input on n CP 0 . Count nQ2 L L L L H H H H L L nQ3 L L L L L L L L H H nQ2 L L H H L L L H H L nQ3 L L L L H L L L L H H=HIGH voltage level; L=LOW voltage level; .2 Bi-quinary Count Sequence Output nQ0 nQ1 0 L L 1 L H 2 L L 3 L H 4 L L 5 H H 6 H L 7 H H 8 H L 9 H H Note: Output nQ3 connected to n CP 0 ; counter input on n CP 1 . Count H=HIGH voltage level; L=LOW voltage level; XBLWversion1.0 www.xinboleic.com Technical Support:4009682003 3 / 17 XBLW SN74HC/HCT390 Dual Decade Ripple Counter Electrical Parameter Absolute Maximum Ratings (Tamb=25℃, voltages are referenced to GND (ground=0V), unless otherwise specified) Characteristic supply voltage Symbol VCC Conditions input clamping current IIK VIVCC+0.5V output clamping current IOK VIVCC+0.5V output current supply current ICC ground current - IGND - IO storage temperature 0.5V