Texas Instruments 74HC390
The CD74HC390 and ’HCT390 dual 4-bit decade ripple counters are high-speed silicon-gate CMOS devices and are pin compatible with low-power Schottky TTL (LSTTL). These devices are divided into four separately clocked sections.| Part No. | 74HC390 |
|---|---|
| Datasheet | 74HC390 Download |
| Manufacturer |  Texas Instruments |
| Description | Dual Decade Ripple Counter |
| Buy | Stock & Price |
FEATURES
DESCRIPTION
● Two BCD Decade or Bi-Quinary Counters● One Package Can Be Configured to Divide-by-2, 4, 5,10, 20, 25, 50 or 100
● Two Master Reset Inputs to Clear Each Decade Counter Individually
● Fanout (Over Temperature Range) - Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads - Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads
● Wide Operating Temperature Range . . . -55oC to 125oC
● Balanced Propagation Delay and Transition Times
● Significant Power Reduction Compared to LSTTL Logic ICs
● HC Types - 2V to 6V Operation - High Noise Immunity: NIL = 30%, NIH = 30% of VCC at VCC = 5V
● HCT Types - 4.5V to 5.5V Operation - Direct LSTTL Input Logic Compatibility, VIL= 0.8V (Max), VIH = 2V (Min) - CMOS Input Compatibility, Il ≤ 1µA at VOL, VOH The counters have two divide-by-2 sections and two divideby-5 sections. These sections are normally used in a BCD decade or bi-quinary configuration, since they share a common master reset (nMR). If the two master reset inputs (1MR and 2MR) are used to simultaneously clear all 8 bits of the counter, a number of counting configurations are possible within one package.
