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M74HC40102F1R 数据表(PDF) 2 Page - STMicroelectronics

部件名 M74HC40102F1R
功能描述  8 STAGE PRESETTABLE SYNCHRONOUS DOWN COUNTERS
Download  14 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

M74HC40102F1R 数据表(HTML) 2 Page - STMicroelectronics

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When the ASYNCHRONOUS PRESET-ENABLE
(APE) input is low, data at the J inputs is asynchron-
ously forced into the counter regardless of the state
of the SPE, CI/CE, or CLOCK inputs. J Inputs J0-J7
represent two 4-bit BCD words for the HC40102 and
a single 8-bit binary word for the HC40103. When
the CLEAR (CLR input is low, the counter is asyn-
chronously cleared to its maximum count (9910 for
the HC40102 and 25510 for the HC40103 regard-
less of the state of any other input. The precedence
relationship between control input is indicated in the
truth table. If all control inputs are high at the time of
zero count, the counters will jump to the maximum
count, giving a counting sequence of 100 pr 256
clock pulses long. The HC40102 and HC40103 may
be cascaded using the CI/CE input and the CO/ZD
output, in either a synchronous or ripple mode. All
inputs are equipped with protection circuits against
static discharge and transient excess voltage.
DESCRIPTION (Continued)
TRUTH TABLE
CONTROL INPUTS
MODE
FUNCTIONAL DESCRIPTION
CLEAR
APE
SPE
CI/CE
H
H
H
H
COUNT INHIBIT
EVEN IF CLOCK IS GIVEN, NO COUNT IS
MADE
H
H
H
L
REGULAR COUNT
DOWN COUNT AT RISING EDGE OF CLOCK
H
H
L
X
SYNCHRONOUS PRESET
DATA OF PI TERMINAL IS PRESET AT
RISING EDGE OF CLOCK
H
L
X
X
ASYNCRONOUS PRESET
DATA PF PI TERMINAL IS
ASYNCHRONOUSLY PRESET TO CLOCK
L
X
X
X
CLEAR
COUNTER IS SET TO MAXIMUM COUNT
X: DON’T CARE - MAXIMUM COUNT: ”99” FOR HC40102 AND ”255”: FOR HC40103
LOGIC DIAGRAM (HC40102)
M54/M74HC40102/40103
2/14


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