Philips hef4528b DATASHEETS
INTEGRATED CIRCUITS
DATA SH EET
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
HEF4528B
MSI
Dual monostable multivibrator
Product specification
File under Integrated Circuits, IC04
January 1995
Philips Semiconductors Product specification
Dual monostable multivibrator
DESCRIPTION
The HEF4528B is a dual retriggerable-resettable
monostable multivibrator. Each multivibrator has an active
LOW input (I0), and active HIGH input (I1), an active LOW
clear direct input (CD), an output (O) and its complement
(O), and two pins for connecting the external timing
components (C
An external timing capacitor (Ct) must be connected
between CTCand RCTCand an external resistor (Rt) must
be connected between RCTCand VDD. The duration of the
(1) Always connected to ground.
TC
(1)
, RCTC).
HEF4528B
MSI
output pulse is determined by the external timing
components Ct and Rt.
A HIGH to LOW transition on I0 when I1is LOW or a LOW
to HIGH transition on I1when I0is HIGH produces a
positive pulse (LOW-HIGH-LOW) and O and a negative
pulse (HIGH-LOW-HIGH) on O if the CDis HIGH. A LOW
Fig.1 Functional diagram.
on CDforces O LOW, O HIGH and inhibits any further
pulses until CDis HIGH.
Fig.2 Pinning diagram.
HEF4528BP(N): 16-lead DIL; plastic (SOT38-1)
HEF4528BD(F): 16-lead DIL; ceramic (cerdip) (SOT74)
HEF4528BT(D): 16-lead SO; plastic (SOT109-1)
( ): Package Designator North America
PINNING
I
0A,I0B
I
, I
1A
1B
CDA, C
DB
O
, O
A
B
OA, O
B
, C
C
TC A
RC
,
TC A
RC
TC B
FAMILY DATA, I
input (HIGH to LOW triggered)
input (LOW to HIGH triggered)
clear direct input (active LOW)
output
complementary output (active LOW)
external capacitor connections
TC B
external capacitor/ resistor connections
LIMITS category MSI
DD
(1)
See Family Specifications
January 1995 2
Philips Semiconductors Product specification
Dual monostable multivibrator
HEF4528B
MSI
Fig.3 Logic diagram (one monostable multivibrator).
January 1995 3
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