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M74HC191 データシート(PDF) 1 Page - STMicroelectronics

部品番号 M74HC191
部品情報  4 BIT SYNCHRONOUS UP/DOWN COUNTERS
Download  14 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M74HC191 データシート(HTML) 1 Page - STMicroelectronics

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August 2001
s
HIGH SPEED :
fMAX = 61 MHz (TYP.) at VCC = 6V
s
LOW POWER DISSIPATION:
ICC =4µA(MAX.) at TA=25°C
s
HIGH NOISE IMMUNITY:
VNIH = VNIL = 28 % VCC (MIN.)
s
SYMMETRICAL OUTPUT IMPEDANCE:
|IOH| = IOL = 4mA (MIN)
s
BALANCED PROPAGATION DELAYS:
tPLH tPHL
s
WIDE OPERATING VOLTAGE RANGE:
VCC (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
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.
M74HC191
4 BIT SYNCHRONOUS UP/DOWN COUNTERS
PIN CONNECTION AND IEC LOGIC SYMBOLS
ORDER CODES
PACKAGE
TUBE
T & R
DIP
M74HC191B1R
SOP
M74HC191M1R
M74HC191RM13TR
TSSOP
M74HC191TTR
TSSOP
DIP
SOP


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