MC14416

The MC14416 is per channel device that allows variable codec time slot assignment to be programmed through a serial microprocessor pon 10-63 time slotsh.The device have independent transmit and receive frame syncs and enables.It also includes chip select and clear to send signals which simplify system design.The MC14416 provides the ability to multiplex off hook signals for a hank of TSACs.The MC14416 TSAC is microprocessor peripherals intended 2o be used to control and supervise per channel codec subscriber channel units.The TSACs consist of three basic functions.

The MC14416 has the following features include:(1)low power; (2)5-volt interface on microprocessor port; (3)5-16 volt output logic levels; (4)independent transmit and receive frame syncs and enables; (5)up to 64 time slots per frame; (6)for use with up to 2.56 mhz clocks; (7)provides power down control for line circuits; (8)CMOS metal gate tor high reliability.The following  section  is  intended  to  facilitate device understanding through several application exampYes.Included are Data Multiplex Timing Diagrams, a description of the TSAC Microprocessor port, a sample program, two circuit configurations using Motorola's devices, a systems drawing and two suggested clock circuits for obtaining codec data and control clocks.

The absolute maximum ratings of the MC14416 are:(1)storage temperature range:-65 to +165°C;(2)operating temperature range:-40 to +85°C;(3)DC supply voltage:-0.5 to +18V;(4)level shit voltage:-0.5 to VDd V;(5)DC current drain per pin:10mA.To demonstrate the programming of the TSAC, consider the following configuration. A  microprocessor is used to control four groups of thirty-two TSACs through an eight-bit PIA port. Four of the PIA lines are used for group select lines. The other four lines are dedicated to GLK, DI, AD, and CTS.The TSACs are programmed by serially loading bits into the DI and AD leads. Data bits are latched on the falling edge of CLK. The P1A port is connected as shown in Figure 9.The flow chart in Figure 10 and the following program illustrate one method of TSAC programming.