IM4712

      The IM4712 Baud Rate Generator provides necessary clock sighals for digital data transmission systems,such as UARTs,using a 2.4576 MHz crystal oscillator as an input.They control up to 8 output channels and can be cascaded for output expansion.Output rate is controlled by four digital input lines,and with the specified crystal,is selectable from "zero" through 9600 Baud.In addition,19200 Baud is possible via hardwiring.Multi-channel operation is facilitated by making the clock frequency and the +8 prescaler outputs available externally.This allows up to eight simultaneous Baud rates to be generated.The IM4712 is identical to the IM4702 with the exception that the IM4712 integrates the oscillator feedback resistor and two load capacitors on-chip.
Then is some features as follows.First,it provides 14 most commonly used BAUD rates.Secondly,the on-chip oscillator requires only one external part (IM4712).The third one is that it controls up to eight transmission channels.Besides,the TTL compatible outputs will sink 1.6 mA.Furthermore,it uses standard 2.4576 MHz crystal.What's more,it has low power consumption which is 5.5 mW guaranteed maximum standby.The sixth one is that the pin and function is compatible with 4702B and HD-4702.The last one is that the input feature active pull-ups.
      The following is about the absolute maximum ratings.The supply voltage (V_DD-V_SS) is +8.0 V.The input or output voltage is from V_SS-0.3 V to V_DD+0.3 V.The storage temperature range is from -65 to +150.The operating temperature range is from -40 to +85.
      What comes next is about the DC characteristics (V_DD=+5V±10%,V_SS=0 V,T_A=-40 to +85).The minimum input voltage high (V_IH) is 70% V_CC.The maximum voltage low (V_IL) is 30% V_CC.The maximum input current high (I_IH) is +10 A at V_IN=V_DD.The maximum input current low (Ix) (I_IL) is +10 A on the codition that Pin Ix at ground and all other inputs at V_DD.The minimum V_OH (output voltage high) is V_DD-0.5 V at I_OH-1 A;Inputs at V_SS or V_DD.The maximum V_OL (output voltage low) is 0.05 V at I_OL +1 A;Inputs at V_SS or V_DD.