7490 (Decade, Divided by twelve AND binary counter- 4-BIT Binary Counter)

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

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.