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M74HC390 Datasheet

  • M74HC390

  • DUAL DECADE COUNTER

  • STMicroelectronics   STMicroelectronics

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M54HC390
M74HC390
DUAL DECADE COUNTER
.
.
.
.
.
.
.
.
HIGH SPEED
f
MAX
= 84 MHz (TYP.) AT V
CC
= 5 V
LOW POWER DISSIPATION
I
CC
= 4
碌A(chǔ)
(MAX.) AT T
A
= 25
擄C
HIGH NOISE IMMUNITY
V
NIH
= V
NIL
= 28 % V
CC
(MIN.)
OUTPUT DRIVE CAPABILITY
10 LSTTL LOADS
SYMMETRICAL OUTPUT IMPEDANCE
|I
OH
| = I
OL
= 4 mA (MIN.)
BALANCED PROPAGATION DELAYS
t
PLH
= t
PHL
WIDE OPERATING VOLTAGE RANGE
V
CC
(OPR) = 2 V TO 6 V
PIN AND FUNCTION COMPATIBLE WITH
54/74LS390
B1R
(Plastic Package)
F1R
(Ceramic Package)
M1R
(Micro Package)
C1R
(Chip Carrier)
ORDER CODES :
M54HC390F1R
M74HC390M1R
M74HC390B1R
M74HC390C1R
PIN CONNECTIONS
(top view)
DESCRIPTION
The M54/74HC390 is a high speed CMOS DUAL
DECADE COUNTER fabricated in silicon gate
C
2
MOS technology. It has the same high speed per-
formance of LSTTL combined with true CMOS low
power consumption.
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 combinations up to a single divide-by-100
counter.
Each 4-bit counter is incremented 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 im-
plementation of divide-by-N counter configurations.
All inputs are equipped with protection circuits
against static discharge and transient excess volt-
age.
February 1993
NC =
No Inter-
nal Con-
1/13

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