Description
MM74C908 MM74C918 Dual CMOS 30V Relay Driver November 1990 MM74C908 MM74C918 Dual CMOS 30V Relay Driver General .
Features
The MM74C908 and MM74C918 are general purpose dual high voltage drivers each capable of sourcing a minimum of 250 mA at VOUT e VCC b 3V and.
Features
* The MM74C908 and MM74C918 are general purpose dual high voltage drivers each capable of sourcing a minimum of 250 mA at VOUT e VCC b 3V and TJ e 65 C
The MM74C908 and MM74C918 consist of two CMOS NAND gates driving an emitter follower Darlington output to achieve high current drive and high voltage
Applications
* (See AN-177 for applications)
TL F 5912
* 6
For example let VCC e 15V RLA e 100X RLB e 100X VL e 0V TA e 25 C iJA e 110 C W Duty CycleA e 50% Duty CycleB e 75%
Assuming RON e 11X then
IOA
e
VCC b VL RON a RLA
15 e e 135 1 mA
11 a 100
IOB
e
VCC b VL RON a RLB
e
135
1
mA
and
TJ
