Datenblatt-pdf.com


CD14538BMS Schematic ( PDF Datasheet ) - Intersil Corporation

Teilenummer CD14538BMS
Beschreibung CMOS Dual Precision Monostable Multivibrator
Hersteller Intersil Corporation
Logo Intersil Corporation Logo 




Gesamt 9 Seiten
CD14538BMS Datasheet, Funktion
CD14538BMS
November 1994
CMOS Dual Precision
Monostable Multivibrator
Features
• High-Voltage Type (20V Rating)
• Retriggerable/Resettable Capability
• Trigger and Reset Propagation Delays Inde-
pendent of RX, CX
• Triggering From Leading or Trailing Edge
• Q and Q Buffered Outputs Available
• Separate Resets
• Wide Range of Output-Pulse Widths
• Schmitt-Trigger Input Allows Unlimited Rise
and Fall Times On +TR and -TR Inputs
• 100% Tested For Maximum Quiescent Cur-
rent at 20V
• Maximum Input Current of 1µA at 18V Over
Full Package-Temperature Range:
- 100nA at 18V and +25oC
• Noise Margin (Full Package-Temperature
Range):
- 1V at VDD = 5V
- 2V at VDD = 10V
- 2.5V at VDD = 15V
• 5V, 10V and 15V Parametric Ratings
• Standardized Symmetrical Output Charac-
teristics
• Meets All Requirements of JEDEC Tentative
Standards No. 13B, “Standard Specifica-
tions for Description of “B” Series CMOS
Device’s
Applications
• Pulse Delay and Timing
• Pulse Shaping
Description
CD14538BMS dual precision monostable multivibrator provides stable retrigger-
able/resettable one-shot operation for any fixed-voltage timing application.
An external resistor (RX) and an external capacitor (CX) control the timing and
accuracy for the circuit. Adjustment of RX and CX provides a wide range of out-
put pulse widths from the Q and Q terminals. The time delay from trigger input to
output transition (trigger propagation delay) and the time delay from reset input
to output transition (reset propagation delay) are independent of RX and CX. Pre-
cision control of output pulse widths is achieved through linear CMOS tech-
niques.
Leading-edge-triggering (+TR) and trailing-edge-triggering (-TR) inputs are pro-
vided for triggering 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 pre-
vent output pulses when power is turned on. An unused RESET input should be
tied to VDD. However, if an entire section of the CD14538BMS is not used, its
inputs must be tied to either VDD or VSS. See Table 1.
In normal operation the circuit retriggers (extends the output pulse one period)
on the application of each new trigger pulse. For operation in the non-retrigger-
able 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 = RXCX.
The minimum value of external resistance, RX is 4K. The minimum and maxi-
mum values of external capacitance, CX, are 0pF and 100µF, respectively.
The CD14538BMS is interchangeable with type MC14538 and is similar to and
pin-compatible with the CD4098B* and CD4538B**.
* T = 0.5 RXCX for CX 1000pF.
* T = RXCX; CX min = 5000pF.
The CD14538BMS is supplied in these 16-lead outline packages:
Braze Seal DIP H4X
Frit Seal DIP
H1L
Ceramic Flatpack H6W
Pinout
CD14538BMS
TOP VIEW
CX1 1
RXCX (1) 2
RESET (1) 3
+TR (1) 4
-TR (1) 5
Q1 6
Q1 7
VSS 8
16 VDD
15 CX2
14 RXCX (2)
13 RESET (2)
12 +TR (2)
11 -TR (2)
10 Q2
9 Q2
Functional Diagram
CX1 RX1
VDD
1 2 RXCX(1)
+TR 4
-TR 5
RESET 3
MONO1
6 Q1
7 Q1
+TR 12
-TR 11
RESET 13
MONO2
10 Q2
9 Q2
VDD = 16
VSS = 8
15 14 RXCX(2)
CX2 RX2
VDD
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
http://www.intersil.com or 407-727-9207 | Copyright © Intersil Corporation 1999
7-640
File Number 3192






CD14538BMS Datasheet, Funktion
Specifications CD14538BMS
TABLE 9. FUNCTIONAL TERMINAL CONNECTIONS
VDD TO TERM #
VSS TO TERM #
INPUT PULSE TO TERM #
FUNCTION
MONO1 MONO2 MONO1 MONO2
MONO1
MONO2
Leading-Edge Trigger/
Retriggerable
3, 5 11, 13
4 12
Leading-Edge Trigger/
Non-Retriggerable
3 13
4 12
Trailing-Edge Trigger/
Retriggerable
3 13
4
12
5
11
Trailing-Edge Trigger/
Non-Retriggerable
3 13
5 11
NOTE:
1. A triggerable one-shot multivibrator has an output pulse width
which is extended one full time period (T) after application of
the last trigger pulse.
2. A non-triggerable one-shot multivibrator has a time period (T)
referenced from the application of the first trigger pulse.
INPUT PULSE TRAIN
RETRIGGERABLE MODE PULSE
WIDTH (+TR MODE)
NON-RETRIGGERABLE MODE
PULSE WIDTH (+TR MODE)
OTHER CONNECTIONS
MONO1 MONO2
5-7
11 - 9
4-6
12 - 10
T
T
Power-Down Mode
During a rapid power-down condition, as would occur with a
power-supply short circuit or with a poorly filtered power sup-
ply, the energy stored in CX could discharge into Pin 2 or 14.
To avoid possible device damage in this mode, when CX is
0.5 microfarad, a protection diode with a 1-ampere or higher
rating (1N5395 or equivalent) and a separate ground return
for CX should be provided as shown in Figure 1.
An alternate protection method is shown in Figure 2, where
a 51-ohm current-limiting resistor is inserted in series with
CX. Note that a small pulse width decrease will occur how-
ever, and RX must be appropriately increases to obtain the
originally desired pulse width.
IN5395
OR
EQUIVALENT
RX
2(14)
VDD
16
+
CX
0.5µfd
1(15)
VSS
8
VSS
FIGURE 1. RAPID POWER-DOWN PROTECTION CIRCUIT
VDD
RX
2(14)
16
51 OHMS
+ 1(15)
CX
0.5µfd
8
VSS
FIGURE 2. ALTERNATE RAPID POWER-DOWN PROTECTION
CIRCUIT
All Intersil semiconductor products are manufactured, assembled and tested under ISO9000 quality systems certification.
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design and/or specifications at any time without
notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate
and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which
may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see web site http://www.intersil.com
645

6 Page







SeitenGesamt 9 Seiten
PDF Download[ CD14538BMS Schematic.PDF ]

Link teilen




Besondere Datenblatt

TeilenummerBeschreibungHersteller
CD14538BMSCMOS Dual Precision Monostable MultivibratorIntersil Corporation
Intersil Corporation

TeilenummerBeschreibungHersteller
CD40175BC

Hex D-Type Flip-Flop / Quad D-Type Flip-Flop.

Fairchild Semiconductor
Fairchild Semiconductor
KTD1146

EPITAXIAL PLANAR NPN TRANSISTOR.

KEC
KEC


www.Datenblatt-PDF.com       |      2020       |      Kontakt     |      Suche