M74HC390 Datasheet, PDF (1/17 Pages) STMicroelectronics – Dual decade counter

M74HC390
Dual decade counter
Features
■ HIgh Speed:
f_MAX = 79MHz (Typ.) at V_CC = 6V
■ Low power dissipation:
I_CC = 4µA (Max.) at T_A = 25°C
■ High noise immunity:
V_NIH = V_NIL = 28 % V_CC (Min.)
■ Balanced propagation delays:
t_PLH ≅ t_PHL
■ Wide operating voltage range:
V_CC (Opr) = 2V to 6V
■ Pin and function compatible with 74 series 390
Description
The M74HC390 is an high speed CMOS dual
decade counter fabricated with silicon gate
C2MOS technology.
This dual decade counter contains two
independent ripple carry counters. Each counter
is composed of a divide by two and divide by five
counter. The divide by two and divide by five
counters can be cascaded to form dual decade,
dual biquinary, or various combination up to a
single divide by 100 counter.
DIP-16
SO-16
Each 4-bit counter is increased on the high to low
transition (negative edge) of the clock input, and
each has an independent clear input. When clear
is set low all four bits of each counter are set to
low. This enables count truncation and allows the
implementation of divide by N counter
configuration.
All inputs are equipped with protection circuits
against static discharge and transient excess
voltage.
Order codes
Part number
M74HC390B1R
M74HC390RM13TR
Package
DIP-14
SO-14
Packaging
Tube
Tape and reel
July 2006
Rev 2
1/17
www.st.com
17