M74HC191_01 Datasheet, PDF (1/14 Pages) STMicroelectronics – 4 BIT SYNCHRONOUS UP/DOWN COUNTERS

M74HC191
4 BIT SYNCHRONOUS UP/DOWN COUNTERS
s HIGH SPEED :
f_MAX = 61 MHz (TYP.) at V_CC = 6V
s LOW POWER DISSIPATION:
I_CC =4µA(MAX.) at T_A=25°C
s HIGH NOISE IMMUNITY:
V_NIH = V_NIL = 28 % V_CC (MIN.)
s SYMMETRICAL OUTPUT IMPEDANCE:
|I_OH| = I_OL = 4mA (MIN)
s BALANCED PROPAGATION DELAYS:
t_PLH ≅ t_PHL
s WIDE OPERATING VOLTAGE RANGE:
V_CC (OPR) = 2V to 6V
s PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 191
DESCRIPTION
The M74HC191 is an high speed CMOS 4-BIT
SYNCHRONOUS UP/DOWN COUNTER
fabricated with silicon gate C²MOS technology.
State changes of the counter are synchronous
with the LOW-to-HIGH transition of the Clock
Pulse Input.
An asynchronous parallel load input overrides
counting and loads the data present on the DATA
inputs into the flip-flops, which makes it possible to
use the circuits as programmable counters. A
count enable input serves as the carry/borrow
DIP
SOP
TSSOP
ORDER CODES
PACKAGE
TUBE
DIP
SOP
TSSOP
M74HC191B1R
M74HC191M1R
T&R
M74HC191RM13TR
M74HC191TTR
input in multi-stage counters. Control input, Down/
Up, determines whether a circuit counts up or
down. A MAX/MIN output and a Ripple Clock
output provide overflow/underflow indication and
make possible a variety of methods for generating
carry/borrow signals in multi-stage counter
applications.
All inputs are equipped with protection circuits
against static discharge and transient excess
voltage.
PIN CONNECTION AND IEC LOGIC SYMBOLS
August 2001
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