(Hong Kong)
Product Summary
The CM8870CSI is a DTMF receiver capability by integrating both the bandsplit filter and digital decoder functions into a single 18-pin DIP, SOIC, or 20-pin PLCC package. The CM8870/70C is manufactured using state-of-the-art CMOS process technology for low power consumption (35mW, max.) and precise data handling. The filter section uses a switched capacitor technique for both high and low group filters and dial tone rejection. The CM8870/70C decoder uses digital counting techniques for the detection and decoding of all 16 DTMF tone pairs into a 4-bit code. This DTMF receiver minimizes external component count by providing an on-chip differential input amplifier, clock generator, and a latched three-state interface bus. The on-chip clock generator requires only a low cost TV crystal or ceramic resonator as an external component. It is ideal for: (1)PABX; (2)Central office; (3)Mobile radio; (4)Remote control; (5)Remote data entry; (6)Call limiting; (7)Telephone answering systems; (8)Paging systems.
Parametrics
CM8870CSI absolute maximum ratings: (1)power supply voltage (vddvss)vdd: 6.0v max; (2)voltage on any pin vdc vss: -0.3v to vdd+0.3v; (3)current on any pin idd: 10ma max; (4)operating temperature ta: -40°c to +85°c; (5)storage temperature ts: -65°c to +150°c.
Features
CM8870CSI features: (1)Full DTMF receiver; (2)Less than 35mW power consumption; (3)Industrial temperature range; (4)Uses quartz crystal or ceramic resonators; (5)Adjustable acquisition and release times; (6)18-pin DIP, 18-pin DIP EIAJ, 18-pin SOIC, 20-pin; (7)PLCC CM8870C: Power down mode; Inhibit mode; Buffered OSC3 output (PLCC package only).; (8)CM8870C is fully compatible with CM8870 for 18-pin devices by grounding pins 5 and 6.
Diagrams
