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M74HC691 データシート(PDF) 2 Page - STMicroelectronics

部品番号 M74HC691
部品情報  HC691/693 4 BIT BINARY COUNTER/REGISTER 3-STATE HC690/692 DECADE COUNTER/REGISTER 3-STATE
PDF  23 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M74HC691 データシート(HTML) 2 Page - STMicroelectronics

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counter’s outputs are stored in the output register at
the positive edge of the register clock (RCK). If the
register clear input (RCLR) is held ”L” the register is
cleared (synchronously
to
register
clock for
HC692/HC693
and
asynchronously
for
HC690/HC691). All inputs are equipped with protec-
tion circuits against static discharge and transient
excess voltage.
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
SYMBOL
NAME AND FUNCTION
3 to 6
A to D
Data Inputs
7, 14
ENT, ENP
Enable Inputs
15 to 18
QA to QD
Data Outputs
1
CCLR
Counter Clear (Active
LOW)
2
CCK
Counter Clock
11
R/C
Counter/ Register Select
8
RCLR
Register Clear (Active
LOW)
9
RCK
Register Clock
19
RCO
Ripple Counter Output
10
GND
Ground (0V)
20
VCC
Positive Supply Voltage
IEC LOGIC SYMBOLS
HC691
HC692
HC693
HC690
M54/M74HC690/691/692/693
2/23



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