SN74278

The SN74278 consist of four data latches,full priority output gating,and a cascading gate.The highest-order data applied at a D latch input is transferred to the appropriate Y output while the strobe input is high,and when the strobe gose low all data is latched.Then cascading input PO is fully overriding and on the highest-order package this input must be held at a low logic level.

Features of the SN74278 are:(1)latched data inputs serve as buffer register and can also:synchronize data acquisition"debounce"mechanical switch input; (2)cascading input PO and output P1 provides "busy"signal inhibiting all lower-order bits; (3)full TTL compatibility; (4)use for:priority interrupt;synchronous priority line selection.

The absolute maximum ratings of the SN74278 can be summarized as:(1)supply voltage,VCC:7V; (2)input voltage:5.5V; (3)operating free-air temperature range:0 to 70; (4)storage temperature range:-65 to 150.

The electrical characteristics(Ta=25) of the SN74278 can be summarized as:(1)VIH:2V MIN; (2)VIL:0.8V MAX; (3)VOH:2.4V MIN 3.4V TYP; (4)II:1mA; (5)IOS:-18mA MIN -57mA MAX; (6)ICC:55mA 80mA MAX.If you want to know more information such as the electrical characteristics ,please download the datasheet in www.seekdatasheet.com .