Name: 74LS90 7490 4-BIT Binary Decade BCD Counter IC
SKU: 29717
Availability: InStock

74LS90 7490 4-BIT Binary Decade BCD Counter IC

The SN54/74LS90, SN54/74LS92 and SN54/74LS93 are high-speed 4-bit ripple type counters partitioned into two sections.
Each counter has a divide-by-two section and either a divide-by-five (LS90), divide-by-six (LS92) or divide-by-eight (LS93) 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 (Preset 9).

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
Applications:
Decade counter
Divide-by-5 counter
4-bit binary counter

Category: IC,S

Description

74LS90 is basically a MOD-10 decade counter that generate a BCD output code. It consists of four master-slave JK flip-flop, which are internally connected to provide MOD-2 (count to 2) counter and MOD-5 counter. 74LS90 also have an independent toggle JK flip-flop by CLKA and other three are driven by the CLKB.

Internal Logic Diagram

74LS90 Pin Configuration
Pin No. Pin Name Description
1 CLKB Clock Input 2
2 R1 Reset 1
3 R2 Reset 2
4 NC Not Connected
5 Vcc Positive Supply Input
6 R3 Reset 3
7 R4 Reset 4
8 Qc Output Pin 3
9 Qb Output Pin 2
10 Gnd Ground
11 Qd Output Pin 4
12 Qa Output Pin 1
13 NC Not Connected
14 CLKA Clock Input 1

SKU: 1582 Categories: Analog, Discrete Electronic Components, ICs Tags: 10 outputs, 7490, 74hc90, 74ls90, bcd counter ic, counter, decade counter, IC, low power, switch

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74LS90 7490 4-BIT Binary Decade BCD Counter IC

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74LS90 7490 4-BIT Binary Decade BCD Counter IC

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