HEF4518B PDF даташит
Спецификация HEF4518B изготовлена «NXP Semiconductors» и имеет функцию, называемую «Dual BCD counter». |
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Детали детали
Номер произв | HEF4518B |
Описание | Dual BCD counter |
Производители | NXP Semiconductors |
логотип |
7 Pages
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INTEGRATED CIRCUITS
DATA SHEET
For a complete data sheet, please also download:
• The IC04 LOCMOS HE4000B Logic
Family Specifications HEF, HEC
• The IC04 LOCMOS HE4000B Logic
Package Outlines/Information HEF, HEC
HEF4518B
MSI
Dual BCD counter
Product specification
File under Integrated Circuits, IC04
January 1995
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Philips Semiconductors
Dual BCD counter
Product specification
HEF4518B
MSI
DESCRIPTION
T he HEF4518B is a dual 4-bit internally synchronous BCD
counter. The counter has an active HIGH clock input
(CP0) and an active LOW clock input (CP1), buffered
outputs from all four bit positions (O0 to O3) and an active
HIGH overriding asynchronous master reset input (MR).
The counter advances on either the LOW to HIGH
transition of the CP0 input if CP1 is HIGH or the HIGH to
LOW transition of the CP1 input if CP0 is LOW. Either CP0
or CP1 may be used as the clock input to the counter and
the other clock input may be used as a clock enable input.
A HIGH on MR resets the counter (O0 to O3 = LOW)
independent of CP0, CP1.
Schmitt-trigger action in the clock input makes the circuit
highly tolerant to slower clock rise and fall times.
Fig.1 Functional diagram.
PINNING
CP0A, CP0B
CP1A, CP1B
MRA, MRB
O0A to O3A
O0B to O3B
clock inputs (L to H triggered)
clock inputs (H to L triggered)
master reset inputs
outputs
outputs
Fig.2 Pinning diagram.
HEF4518BP(N): 16-lead DIL; plastic (SOT38-1)
HEF4518BD(F): 16-lead DIL; ceramic (cerdip) (SOT74)
HEF4518BT(D): 16-lead SO; plastic (SOT109-1)
( ): Package Designator North America
APPLICATION INFORMATION
Some examples of applications for the HEF4518B are:
• Multistage synchronous counting.
• Multistage asynchronous counting.
• Frequency dividers.
FAMILY DATA, IDD LIMITS category MSI
See Family Specifications
January 1995
2
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FUNCTION TABLE
CP0 CP1 MR
MODE
H L counter advances
L L counter advances
X L no change
X L no change
L L no change
H L no change
X X H O0 to O3 = LOW
Notes
1. H = HIGH state (the more positive voltage)
L = LOW state (the less positive voltage)
X = state is immaterial
= positive-going transition
= negative-going transition
Fig.3 Logic diagram (one counter).
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Номер в каталоге | Описание | Производители |
HEF4518B | Dual BCD counter | NXP Semiconductors |
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