The IW4040B is ripple-carry binary counter. All counter stages are master-slave flip-flops. The state of a counter advances one count on the negative transition of each input pulse; a high level on the RESET line resets the counter to its all zeros state. Schmitt trigger action on the input-pulse line permits unlimited rise and fall times.

• Operating Voltage Range: 3.0 to 18 V
• Maximum input current of 1 mA at 18 V over full package-temperature range; 100 nA at 18 V and 25°C
• Noise margin (over full package temperature range):
    1.0 V min @ 5.0 V supply
    2.0 V min @ 10.0 V supply
    2.5 V min @ 15.0 V supply