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PDF 74LS121 Data sheet ( Hoja de datos )
| Número de pieza | 74LS121 | |
| Descripción | Clear and Complementary Outputs | |
| Fabricantes | National | |
| Logotipo |  |
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June 1989
54121 DM54121 DM74121 One-Shot with
Clear and Complementary Outputs
General Description
Y Jitter free Schmitt-trigger input
The DM54 74121 is a monostable multivibrator featuring
both positive and negative edge triggering with complemen-
Y Excellent noise immunity typically 1 2V
Y Stable pulse width up to 90% duty cycle
tary outputs An internal 2kX timing resistor is provided for Y TTL DTL compatible
design convenience minimizing component count and lay- Y Compensated for VCC and temperature variations
out problems This device can be used with a single external
capacitor Inputs (A) are active-low trigger transition inputs
and input (B) is an active-high transition Schmitt-trigger in-
put that allows jitter-free triggering from inputs with tran-
msition rates as slow as 1 volt second A high immunity to
VCC noise of typically 1 5V is also provided by internal cir-
ocuitry at the input stage
To obtain optimum and trouble free operation please read
.coperating rules and NSC one-shot application notes careful-
ly and observe recommendations
Features
UY Triggered from active-high transition or active-low tran-
sition inputs
t4Y Variable pulse width from 30 ns to 28 seconds
Y Input clamp diodes
Y Alternate Military Aerospace device (54121) is avail-
able Contact a National Semiconductor Sales Office
Distributor for specifications
Functional Description
The basic output pulse width is determined by selection of
an internal resistor RINT or an external resistor (RX) and
capacitor (CX) Once triggered the output pulse width is in-
dependent of further transitions of the inputs and is a func-
tion of the timing components Pulse width can vary from a
few nano-seconds to 28 seconds by choosing appropriate
RX and CX combinations There are three trigger inputs from
the device two negative edge-triggering (A) inputs one pos-
itive edge Schmitt-triggering (B) input
eConnection Diagram
eDual-In-Line Package
.DataShTL F 6538–1
wOrder Number 54121DMQB 54121FMQB
DM54121J DM54121W or DM74121N
wwSee NS Package Number J14A N14A or W14B
Function Table
Inputs
A1 A2
B
L XH
X LH
XXL
HHX
HvH
vH H
vv H
L Xu
X Lu
H e High Logic Level
L e Low Logic Level
X e Can Be Either Low or High
u e Positive Going Transition
v e Negative Going Transition
e A Positive Pulse
e A Negative Pulse
Outputs
QQ
LH
LH
LH
LH
C1995 National Semiconductor Corporation TL F 6538
www.DataSheet4U.comRRD-B30M105 Printed in U S A
1 page  
Physical Dimensions inches (millimeters)
14-Lead Ceramic Dual-In-Line Package (J)
Order Number 54121DMQB or DM54121J
NS Package Number J14A
14-Lead Molded Dual-In-Line Package (N)
Order Number DM74121N
NS Package Number N14A
5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet 74LS121.PDF ] | |
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