Thank you for visiting RadioShack. If you need assistance with shopping on our site, please call us at 800-843-7422 and a customer care representative will be happy to assist you. Please inform the Customer Service representative that you require assistance.
The NTE74390 is a monolithic dual 4−bit decade ripple counter in a 16−lead plastic DIP-type package that contains eight master−slave flip−flops and additional gating to implement two individual four−bit counters. This device incorporates dual divide−by−two and divide−by−five counters, which can be used to implement cycle lengths equal to any whole and/or cumulative multiples of 2 and/or 5 up to divide−by−100. When connected as a bi−quinary counter, the separate divide−by−two circuit can be used to provide symmetry (a square wave) at the final output stage. The NTE74390 has parallel outputs from each counter stage so that any submultiple of the input count frequency is available for system−timing signals.
Dual version of the popular NTE7490
Individual clocks for A and B flip−flops provide dual ÷ 2 and ÷ 5 counters
Direct clear for each 4−Bit counter
Dual 4−Bit versions can significantly improve system densities by reducing counter package count by 50%
Typical maximum count frequency: 35MHz
Buffered outputs reduce possibility of collector commutation
Absolute Maximum Ratings: Unless otherwise specified, all voltages are referenced to GND
Supply voltage, VCC: 7V
Input voltage: 5.5V
Operating temperature range, TA: 0°C to +70°C
Storage temperature range, Tstg: −65°C to +150°C
Pricing and availability: Please note that all prices are subject to change without prior notice. Prices advertised on this site are for online orders only. Prices on some items may differ from those advertised in RadioShack stores. All merchandise may not be available at all stores, and all stores may not participate in all sales promotions. We recommend you contact the store to confirm product availability and price.