LSI/CSI LS7166A

The LS7166A is a CMOS 24-bit counter programmable to operate in a variety of functional modes. The operating mode is set by writing configuration data to the control registers (see Figure 8). There are three 6-bit and one 2-bit control registers for configuring functional modes. In addition to the control registers, there is a 5-bit status register that indicates the instantaneous state of the device. A 24-bit preset register is provided for presetting the counter and also serves as the divisor in modulo-N count mode. The device communicates with the master controller via an 8-bit tri-state bidirectional data bus through read and write operations. Additionally, discrete inputs and outputs facilitate instantaneous hardware control functions and instantaneous status indication.

• Programmable counting modes: non-quadrature, up/down, quadrature X1, X2 or X4, binary, BCD, 24-hour clock, modulo-N, and single-cycle.
• Count frequency up to 40MHz in non-quadrature mode.
• 24-bit counter, 24-bit preset register, and 24-bit comparator.
• 8-bit bidirectional data bus for microcontroller interface.
• Readable status register.
• Carry, borrow, carry toggle, and borrow toggle outputs.
• Compare and compare toggle outputs for counter-to-preset register equality comparison.
• Programmable inputs for dynamic hardware control.
• TTL and CMOS compatible I/O.
• Operating voltage: 3V to 5.5V.
• Package types: DIP (LS7166A), SOIC (LS7166A-S), TSSOP (LS7166A-TS24).