W91081

The W91081 is Si-gate CMOS IC that provide necessary signal for either pulse or tone dialing.W91081 features a built-in 32 digits redial and a 32 digits ROM memory for fixed number dialing.It has many unique features: The first one is DTMF/PULSE switchable dialer.The second one is 32 digits for redial memory.The third one is 32 digits ROM memory for fixed number dialing.The forth one is pulse to tone keypad for long distance call operation.The fifth one is 4 * 4 keyboard can be used,etc.

There are some absolute maximum ratings about W91081.DC supply voltage(VDD-VSS) us -0.3 V to 7.0 V. Input/output voltage(VIL) is Vss+0.3 V.VIH is VDD +0.3 V.VOL is Vss-0.3 V.VOH is VDD +0.3 V.Power dissipation(PD) is 120 mW.Operating temperature(Topr) is 0 to 70.Storage temperature(Tstg) is -55 to 150.DC charactersitics(VDD-VSS is 2.5 V , Fosc.is 3.58 MHz, Ta is 25, all output unloaded): Operating voltage(VDD) is 2.0 V min and 5.5 V max. Operating current(Iop) is 1.0 mA max(tone) or is 0.50 mA (max(pulse).DTMF output sink current(IPL) is 0.5 mA min when Vpo is 0.5 V. Keypad input drive current(Ikd) is 4 uA min when Vi is 0 V. 

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