IL91531

TECHNICAL DATA IL91531 PARALLEL INPUT TONE/PULSE DIALER High-Performance Silicon-Gate CMOS The IL91531 provides a 4-bit data input and a handshaking signal to serve as microcomputer interfaces. Under microcomputer control the IL91531 generates both a DTMF signal and a pulse output for telephone dialing. All necessary dual-tone frequencies and dial pulse outputs are derived from the widely used TV crystal standard, providing high accuracy and stability. The required sinusoidal waveform for individual tones is digitally synthesized on the chip, resulting in a waveform with very low total harmonic distortion. 4-bit parallel data input from microcomputer TTL compatible inputs and outputs Uses TV crystal standard (3.58 MHz) to derive all frequencies, providing high accuracy and stability Operating voltage: 2.5 to 5.5 Volts Selectable M/B ratio 10 PPS dial rate DTMF signaling of digits 0 9, *, #, A, B, C, and D Pulse signaling of 0 ∼ 9, *, #, and A High group tone pre-emphasis: 2 dB Low total harmonic distortion in DTMF signaling ORDERING INFORMATION IL91531N TA = -10° to 70° C www.DataSheet4U.com LOGIC DIAGRAM PIN ASSIGNMENT PIN 10 = GND PIN 16 = VCC 1 ww.DataSheet4U.com IL91531 PIN DESCRIPTION Pin No. Designation 1 MODE DESCRIPTION Tone mode select input. When this input is high, the tone output and ASK output are normal. When this input is low, a DTMF signal will be generated continuously and any new input data will be ignored. This input affects th...