CD40160 CMOS Synchronous Programmable 4-Bit Counter - (AD33519)

Description:

The CD40160BMS, CD40161BMS, CD40162BMS, and CD40163BMS are 4-bit synchronous programmable counters. The CLEAR function on the CD40162BMS and CD40163BMS is synchronous and a low level on the CLEAR input sets all four outputs low on the next positive clock edge. The CLEAR function on the CD40160BMS and CD40161BMS is asynchronous and a low level on the CLEAR input sets all four outputs low, regardless of the state of the CLOCK, LOAD, or ENABLE inputs. A low level on the LOAD input disables the counter and causes the output to agree with the setup data after the next clock pulse, regardless of the conditions of the ENABLE inputs.

The look-ahead carry circuit allows for cascading counters for n-bit synchronous applications without the need for additional gates. Critical to this function are two count enable inputs and a carry output (COUT). Counting is enabled when both PE and TE inputs are high. The TE input is fed forward to enable COUT. This enabled output produces positive output pulses with a duration approximately equal to the positive portion of the Q1 output. This positive overflow carry pulse can be used to enable succeeding cascaded stages. Logic transitions at the PE or TE inputs can occur while the clock is either high or low. The CD40160BMS to CD40163BMS types are functionally equivalent to and pin-compatible with the 74LS160 to 74LS163 series of TTL counters, respectively.

Datasheet