74HC390 74HCT390 Dual decade ripple counter Rev. 5 18 October 2021 Product data sheet 1. General description The 74HC390 74HCT390 is a dual 4-bit decade ripple counter divided into four separately clocked sections. The counters have two divide-by-2 sections and two divide-by-5 sections. These sections share an asynchronous master reset input (nMR) and can be used in a BCD decade or bi-quinary configuration. If 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. The separate clocks (nCP0 and nCP1) of each section allow ripple counter or frequency division applications of divide-by-2, 4, 5, 10, 20, 25, 50 or 100. Each section is triggered by the HIGH-to-LOW transition of the clock inputs (nCP0 and nCP1). For BCD decade operation, the nQ0 output is connected to the nCP1 input of the divide-by-5 section. For bi-quinary decade operation, the nQ3 output is connected to the nCP0 input and nQ0 becomes the decade output. A HIGH on the nMR input overrides the clocks and sets the four outputs LOW. This device features reduced input threshold levels to allow interfacing to TTL logic levels. Inputs also include clamp diodes, this enables the use of current limiting resistors to interface inputs to voltages in excess of V . CC 2. Features and benefits Input levels: For 74HC390: CMOS level For 74HCT390: TTL level Two BCD decade or bi-quinary counters One device 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 Supply voltage range from 4.5 V to 5.5 V High noise immunity Latch-up performance exceeds 100 mA per JESD 78 Class II Level B Complies with JEDEC standard JESD7A (4.5 V to 5.5 V) ESD protection: HBM JESD22-A114F exceeds 2000 V MM JESD22-A115-A exceeds 200 V Specified from -40 C to +85 C and from -40 C to +125 C 3. Ordering information Table 1. Ordering information Type number Package Temperature range Name Description Version 74HC390D -40 C to +125 C SO16 plastic small outline package 16 leads SOT109-1 body width 3.9 mm 74HCT390D 74HC390PW -40 C to +125 C TSSOP16 plastic thin shrink small outline package 16 leads SOT403-1 body width 4.4 mm 74HCT390PWNexperia 74HC390 74HCT390 Dual decade ripple counter 4. Functional diagram 1 1CP0 CP0 15 2CP0 1Q0 3 2 Q0 2Q0 13 2 1MR MR 14 2MR 4 1CP1 1Q1 5 CP1 Q1 12 2CP1 2Q1 11 1Q2 6 5 Q2 2Q2 10 1Q3 7 MR Q3 2Q3 9 aaa-024291 Fig. 1. Logic symbol Q0 Q1 Q2 Q3 CP1 FF1 Q FF2 Q FF3 Q FF4 Q CP0 CP CP CP CP RD RD RD RD MR aaa-024292 Fig. 2. Logic diagram (one counter) 5. Pinning information 5.1. Pinning 74HC390 74HCT390 1CP0 1 16 V CC 74HC390 1MR 2 15 2CP0 74HCT390 1Q0 3 14 2MR 1CP0 1 16 V CC 1MR 2 15 2CP0 1CP1 4 13 2Q0 1Q0 3 14 2MR 1Q1 5 12 2CP1 1CP1 4 13 2Q0 1Q2 6 11 2Q1 1Q1 5 12 2CP1 1Q2 6 11 2Q1 1Q3 7 10 2Q2 1Q3 7 10 2Q2 GND 8 9 2Q3 GND 8 9 2Q3 aaa-024293 aaa-024294 Fig. 3. Pin configuration for SOT109-1 (SO16) Fig. 4. Pin configuration for SOT403-1 (TSSOP16) 74HC HCT390 All information provided in this document is subject to legal disclaimers. Nexperia B.V. 2021. All rights reserved Product data sheet Rev. 5 18 October 2021 2 / 15