From Most Electronic's description
74HC90-7490 is a high-quality electronic component designed for Arduino, prototyping, and educational electronics. high-speed 4-bit ripple type counters partitioned into two sections. Each counter has a divide-by-two section and either a divide-by-five section which are triggered by a HIGH-to-LOW transition on the clock inputs. Each section can be used separately or tied together (Q to CP) to form BCD, bi-quinary, modulo-12, or modulo-16 counters. All of the counters have a 2-input gated Master Reset (Clear), and the LS90 also has a 2-input gated Master Set (Preset 9) BCD Decade (8421) Counter — The CP1 input must be externally connected to the Q0 output. The CP0 input receives the incoming count and a BCD count sequence is produced. Symmetrical Bi-quinary Divide-By-Ten Counter — The Q3 output must be externally connected to the CP0 input. The input count is then applied to the CP1 input and a divide-by-ten square wave is obtained at output Q0 Specifications No. of Pins: 14 Operating Temperature Range :0°C to +70°C Supply Voltage Range: 4.75 V to 5.25V Package: DIP-14 Symbol pin Description CP0 1 Clock (Active LOW going edge) Input to ÷2 Section CP1 14 Clock (Active LOW going edge) Input to ÷5 Section MR1,MR2 2,3 Master Reset (Clear) Inputs MS1,MS2 6,7 Master Set (Preset-9, LS90) Inputs Q0 12 Output from ÷2 Section Q1,Q2,Q3 9,8,11 Outputs from ÷5 sections NC 4, 13 data inputs source 2 VCC 5 supply voltage Notes – The Output LOW drive factor is 2.5 U.L. for Military, (54) and 5 U.L. for commercial (74) Temperature Ranges. – The Q0 Outputs are guaranteed to drive the full fan-out plus the CP1 input of the device- -1 TTL Unit Load (U.L.) = 40 μA HIGH/1.6 mA LOW. -To insure proper operation the rise (tr) and fall time (tf) of the clock must be less than 100 ns. For 74HC90 Datasheet Click Here It’s perfect for DIY makers, students, and anyone building custom electronic circuits or STEM kits.
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