(China (Mainland))
Product Summary
The TC74HC148AF is a high speed line encoder fabricated with silicon gate C2MOS technology. The TC74HC148AF achieves the high speed operation similar to equivalent LSTTL while maintaining the CMOS low power dissipation. All data inputs and outputs of these encoders are active at the low logic level. The encoder detects a low level of the highest order among eight input signals and outputs the corresponding signal position in binaly code.
Parametrics
TC74HC148AF absolute maximum ratings: (1)Supply voltage range VCC: -0.5 to 7 V; (2)DC input voltage VIN: -0.5 to VCC + 0.5 V; (3)DC output voltage VOUT: -0.5 to VCC + 0.5 V; (4)Input diode current IIK: ±20 mA; (5)Output diode current IOK: ±20 mA; (6)DC output current IOUT: ±25 mA; (7)DC VCC/ground current ICC: ±50 mA; (8)Power dissipation PD: 500 (DIP)(Note 2)/180 (SOP)mW; (9)Storage temperature Tstg: -65 to 150 °C.
Features
TC74HC148AF features: (1)High speed: tpd = 15 ns (typ.)at VCC = 5 V; (2)Low power dissipation: ICC = 4 μA (max)at Ta = 25°C; (3)High noise immunity: VNIH = VNIL = 28% VCC (min); (4)Output drive capability: 10 LSTTL loads; (5)Symmetrical output impedance: |IOH| = IOL = 4 mA (min); (6)Balanced propagation delays: tpLH -tpHL; (7)Wide operating voltage range: VCC (opr)= 2 to 6 V; (8)Pin and function compatible with 74LS148.
Diagrams
