74LS90 IC – (SMD Package) - Decade Counter IC (7490 IC)

The 74LS90 is a 4-bit ripple type counters partitioned into two sections. Each counter has a divide-by-two section and either a divide-by-five (LS90) section which are triggered by a HIGH-to-LOW transition on the clock inputs. Each section can be used separately or tied together (Q to CP) to form BCD, bi-quinary, modulo-12, or modulo-16 counters. All of the counters have a 2-input gated Master Reset (Clear), and the LS90 also has a 2-input gated Master Set. The following are the features:-

• Low Power Consumption :Typically 45 mW

• High Count Rates :Typically 42 MHz

• Choice of Counting Modes : BCD, Bi-Quinary, Divide-by-Twelve, Binary

• Input Clamp Diodes Limit High Speed Termination Effects

Specification:-

Symbol	Parameter	Min	Type	Max	Units
VCC	Supply Voltage	4.5	5	5.5	V
TA	Operating Ambient Temperature Range	-55	25	125	°C
IOH	Output Current — High			–0.4	m A
IOL	Output Current — Low			8	m A

Related Document:-

74LS90 SMD Data Sheet