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Brand: Generic | SKU: 4022701
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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 |
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