74LS90 – Decade and Binary Counters

74LS90 Information is available here.

Part Number : 74LS90, DM74LS90M, DM74LS90N

Function : Decade and Binary Counters.

Package : DIP, SOIC 14 Pin Type

Manufacturer : Fairchild Semiconductor

Image :

74LS90 datasheet pinout

Some text files in PDF file :

DM74LS90 Decade and Binary Counters


Each of these monolithic counters contains four masterslave flip-flops and additional gating to provide a divide-bytwo counter and a three-stage binary counter for which the count cycle length is divide-by-five for the DM74LS90. All of these counters have a gated zero reset and the DM74LS90 also has gated set-to-nine inputs for use in BCD nine’s complement applications.

To use their maximum count length (decade or four bit binary), the B input is connected to the QA output. The input count pulses are applied to input A and the outputs are as described in the appropriate truth table. A symmetrical divide-by-ten count can be obtained from the DM74LS90 counters by connecting the QD output to the A input and applying the input count to the B input which gives a divide-by-ten square wave at output QA.


1. Typical power dissipation 45 mW

2. Count frequency 42 MHz

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74LS90 PDF File

74LS90 pdf

3BR0665J – SMPS Current Mode Controller, ICE3BR0665J

3BR0665J Information is available here.

Part Number : 3BR0665J , ICE3BR0665J.

Function : 650V, Off-Line SMPS Current Mode Controller

Package : DIP 8 Pin Type

Manufacturer : Infineon Technologies

Image :

3BR0665J datasheet pinout

Some text files in PDF file :

The CoolSET-F3R jitter series (ICE3BRxx65J) is the latest version of CoolSET®-F3. It targets for the Off-Line battery adapters and low cost SMPS for lower power range such as application for DVD R/W, DVD Combi, Blue ray DVD player, set top box, etc. [ … ]



• 650V avalanche rugged CoolMOS with built-in Startup Cell
• Active Burst Mode for lowest Standby Power
• Fast load jump response in Active Burst Mode
• 65kHz internally fixed switching frequency
• Auto Restart Protection Mode for Overload, Open Loop, VCC Undervoltage, Overtemperature & Overvoltage


Product Highlights
• Active Burst Mode to reach the lowest Standby Power Requirements < 50mW
• Auto Restart protection for overload, overtemperature, overvoltage
• External auto-restart enable function
• Built-in soft start and blanking window

• Extendable blanking Window for high load jumps



3BR0665J PDF File

3BR0665J pdf