Nexperia 74HC4520PW,118

The 74HC4520; 74HCT4520 are dual 4-bit internally synchronous binary counters with two clock inputs (nCP0 and nCP1). They have buffered outputs from all 4 bit positions (nQ0 to nQ3) and an asynchronous master reset input (nMR). The counter advances on the LOW-to-HIGH transition of nCP0 when nCP1 is HIGH. It also advances on the HIGH-to-LOW transition of nCP1 when nCP0 is LOW. Either nCP0 or nCP1 may be used as the clock input to the counter. The other clock input may be used as a clock enable input. A HIGH on nMR, resets the counter (nQ0 to nQ3 = LOW), independent of nCP0 and nCP1. Inputs include clamp diodes. It enables the use of current limiting resistors to interface inputs to voltages in excess of VCC.

• Wide supply voltage range from 2.0 V to 6.0 V
• CMOS low power dissipation
• High noise immunity
• Latch-up performance exceeds 100 mA per JESD 78 Class II Level B
• Complies with JEDEC standards:
  • JESD8C (2.7 V to 3.6 V)
  • JESD7A (2.0 V to 6.0 V)
• Input levels:
  • For 74HC4520: CMOS level
  • For 74HCT4520: TTL level
• ESD protection:
  • HBM: ANSI/ESDA/JEDEC JS-001 class 2 exceeds 2000 V
  • CDM: ANSI/ESDA/JEDEC JS-002 class C3 exceeds 1000 V
• Specified from -40 °C to +85 °C and -40 °C to +125 °C

• Multistage synchronous counting
• Multistage asynchronous counting
• Frequency dividers