SL74HC161

SL74HC161 Presettable Counters High-Performance Silicon-Gate CMOS The SL74HC161 is identical in pinout to the LS/ALS161. The device inputs are compatible with standard CMOS outputs; with pullup resistors, they are compatible with LS/ALSTTL outputs. The SL74HC161 is programmable 4-bit synchronous counter that feature parallel Load, asynchronous Reset, a Carry Output for cascading and count-enable controls. The SL74HC161 is binary counter with asynchronous Reset. Outputs Directly Interface to CMOS, NMOS, and TTL Operating Voltage Range: 2.0 to 6.0 V Low Input Current: 1.0 µA High Noise Immunity Characteristic of CMOS Devices LOGIC DIAGRAM ORDERING INFORMATION SL74HC161N Plastic SL74HC161D SOIC TA = -55° to 125° C for all packages PIN ASSIGNMENT PIN 16 =VCC PIN 8 = GND FUNCTION TABLE Inputs Reset L H H H H H Load X L H H H X Enable P X X X L H X Enable T X X L X H X Clock X Q0 L P0 Outputs Q1 L P1 Q2 L P2 Q3 L P3 Function Reset to “0” Preset Data No count No count Count No count No change No change Count up No change X=don’t care P0,P1,P2,P3 = logic level of Data inputs Ripple Carry Out = Enable T Q0 Q1 Q2 Q3 SLS System Logic Semiconductor SL74HC161 MAXIMUM RATINGS * Symbol VCC VIN VOUT IIN IOUT ICC PD Tstg TL * Parameter DC Supply Voltage (Referenced to GND) DC Input Voltage (Referenced to GND) DC Output Voltage (Referenced to GND) DC Input Current, per Pin DC Output Current, per Pin DC Supply Current, VCC and GND Pins Power Dissipation in Still Air...