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PDF HEF4538B Data sheet ( Hoja de datos )
| Número de pieza | HEF4538B | |
| Descripción | Dual precision monostable multivibrator | |
| Fabricantes | NXP Semiconductors | |
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HEF4538B
Dual precision monostable multivibrator
Rev. 10 — 1 April 2016
Product data sheet
1. General description
The HEF4538B is a dual retriggerable-resettable monostable multivibrator. Each
multivibrator has an active LOW trigger/retrigger input (nA), an active HIGH
trigger/retrigger input (nB), an overriding active LOW direct reset input (nCD), an output
(nQ) and its complement (nQ), and two pins (nREXT/CEXT, and nCEXT, always
connected to ground) for connecting the external timing components CEXT and REXT.
Typical pulse width variation over the specified temperature range is 0.2 %.
The multivibrator may be triggered by either the positive or the negative edges of the input
pulse and will produce an accurate output pulse with a pulse width range of 10 s to
infinity. The duration and accuracy of the output pulse are determined by the external
timing components CEXT and REXT. The output pulse width (tW) is equal to REXT CEXT.
The linear design techniques in LOCMOS (Local Oxide CMOS) guarantee precise control
of the output pulse width. A LOW level at nCD terminates the output pulse immediately.
The trigger inputs’ Schmitt trigger action makes the circuit highly tolerant of slower rise
and fall times.
It operates over a recommended VDD power supply range of 3 V to 15 V referenced to VSS
(usually ground). Unused inputs must be connected to VDD, VSS, or another input.
2. Features and benefits
Tolerant of slow trigger rise and fall times
Fully static operation
5 V, 10 V, and 15 V parametric ratings
Standardized symmetrical output characteristics
Specified from 40 C to +85 C and 40 C to +125 C
Complies with JEDEC standard JESD 13-B
3. Ordering information
Table 1. Ordering information
All types operate from 40 C to +125 C.
Type number
Package
Name
Description
HEF4538BT
SO16
plastic small outline package; 16 leads; body width 3.9 mm
Version
SOT109-1
1 page  
NXP Semiconductors
HEF4538B
Dual precision monostable multivibrator
Q%LQSXW
Q$LQSXW
Q&'LQSXW
Q5(;7&(;7LQSXW
9UHI
9UHI
Q4RXWSXW
77
(1) Positive edge triggering.
(2) Positive edge re-triggering (pulse lengthening).
(3) Negative edge triggering.
(4) Reset (pulse shortening).
(5) T = REXT CEXT.
Fig 4. Timing diagram
9UHI
9UHI
7
DDH
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5(;7
9''
Q&(;7
Q5(;7&(;7
Q4 7
Q$
Q%
7 5(;7î&(;7
Q4
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DDH
Fig 5. Connection of the external timing components REXT and CEXT
7. Limiting values
Table 4. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to VSS = 0 V (ground)
Symbol
Parameter
Conditions
Min Max Unit
VDD supply voltage
0.5 +18 V
IIK
input clamping current
VI < 0.5 V or VI > VDD + 0.5 V
- 10 mA
VI input voltage
0.5
VDD + 0.5 V
IOK
output clamping current
VI < 0.5 V or VI > VDD + 0.5 V
- 10 mA
II/O input/output current
- 10 mA
IDD supply current
Tstg storage temperature
- 50 mA
65 +150 C
HEF4538B
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 10 — 1 April 2016
© NXP Semiconductors N.V. 2016. All rights reserved.
5 of 17
5 Page 
NXP Semiconductors
HEF4538B
Dual precision monostable multivibrator
W:
DDH
W:
DDH
7DPE &
7DPE &
a. REXT = 100 k; CEXT = 100 nF
b. REXT = 100 k; CEXT = 2 nF
(1) VDD = 5 V.
(2) VDD = 10 V.
(3) VDD = 15 V.
tW = 0 % at VDD = 10 V and Tamb = 25 C
Fig 8. Typical normalized change in output pulse width as a function of ambient temperature
ǻW:
DDH
,''
$
DDH
9'' 9
Tamb = 25 C; tW = 0 % at VDD = 10 V; REXT = 100 k
(1) CEXT = 2 nF.
(2) CEXT = 100 nF.
Fig 9. Typical normalized change in output pulse
width as a function of the supply voltage
į
REXT = 100 k; CEXT = 100 nF; CL = 50 pF;
one monostable multivibrator switching only
(1) VDD = 15 V.
(2) VDD = 10 V.
(3) VDD = 5 V.
Fig 10. Total supply current as a function of the
output duty factor
HEF4538B
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 10 — 1 April 2016
© NXP Semiconductors N.V. 2016. All rights reserved.
11 of 17
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| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet HEF4538B.PDF ] | |
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