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HCF4538B датащи(PDF) 2 Page - STMicroelectronics

номер детали HCF4538B
подробное описание детали  DUAL MONOSTABLE MULTIVIBRATOR
Download  10 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

HCF4538B датащи(HTML) 2 Page - STMicroelectronics

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from either edge of an input pulse. An unused +TR
input should be tied to VSS. An unused -TR input
should be tied to VDD . A RESET (on low level) is
provided for immediate termination of the output
pulse or to prevent output pulses when power is
turned on. An unused RESET input should be tied
to VDD . However, if an entire section of the
HCF4538B is not used, its inputs must be tied to
either VDD or VSS (see table 1). In normal
operation the circuit triggers (extends the output
pulse one period) on the application of each new
trigger pulse. For operation in the non-retiggerable
mode, Q is connected to -TR when leading edge
triggering (+TR) is used or Q is connected to +TR
when trailing edge triggering (-TR) is used. The
time period (T) for this multivibrator can be
calculated by : T = RX CX. The min. value of
external resistance, RX, is 4KΩ. The max. and
min. values of external capacitance, CX, are 100
µF and 5nF, respectively.
IINPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
Terminals 1, 8, 15 are electrically connected internally
FUNCTIONAL DIAGRAM
PIN No
SYMBOL
NAME AND FUNCTION
4, 12
+TR
Trigger Inputs (Low to
High, Edge-Triggered)
5, 11
-TR
Trigger Inputs (High to
Low, Edge-Triggered)
3, 13
RESET
Direct Reset Inputs
(Active Low)
1, 15
CX1, CX2
External Capacitor Con-
nections
2, 14
RXCX1
RXCX2
External Resistor/Capaci-
tor Connections
6, 10
Q1, Q2
Pulse Outputs
7, 9
Q1, Q2
Complementary Pulse
Outputs
8
VSS
Negative Supply Voltage
16
VDD
Positive Supply Voltage


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