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HD74LS123P Datasheet

Dual Retriggerable Monostable Multivibrators

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HD74LS123
Dual Retriggerable Monostable Multivibrators (with Clear)
REJ03D0429–0200
Rev.2.00
Feb.18.2005
This d-c triggered multivibrator features output pulse width control by three method. The basic pulse time is
programmed by selection of external resistance and capacitance values. Once triggered, the basic pulse width may be
extended by retriggering the gated low-level -active (A) or high-level active (B) inputs, or be reduced by use of the
overriding clear. Figure 1 illustrates pulse control by retriggering and early clear. This device is provided enough
Schmitt hysteresis to ensure jitter-free triggering from the B input with transition rates as slow as 0.1 mV/ns.
Features
Ordering Information
Part Name
Package Type
Package Code
(Previous Code)
Package
Abbreviation
HD74LS123P
DILP-16 pin
PRDP0016AE-B
P
(DP-16FV)
HD74LS123FPEL SOP-16 pin (JEITA)
PRSP0016DH-B
(FP-16DAV)
FP
PRSP0016DG-A
HD74LS123RPEL SOP-16 pin (JEDEC) (FP-16DNV)
RP
Note: Please consult the sales office for the above package availability.
Taping Abbreviation
(Quantity)
EL (2,000 pcs/reel)
EL (2,500 pcs/reel)
A = "L"
Clear = "H"
B
Q
A = "L"
B
Clear
Q
Retrigger Pulse
"H"
"L"
tw + tPLH
"H"
tw
"L"
Output without
retrigger
"H"
"L"
"H"
"L"
Output without
clear
"H"
"L"
Figure 1
Typical Input / Output Pulse
Rev.2.00, Feb.18.2005, page 1 of 8


Renesas Electronics Components Datasheet

HD74LS123P Datasheet

Dual Retriggerable Monostable Multivibrators

No Preview Available !

HD74LS123
Pin Arrangement
1A 1
1B 2
1CLR 3
1Q 4
2Q 5
2Cext 6
2Rext/Cext 7
GND 8
CLR
QQ
QQ
CLR
16 VCC
15 1Rext/Cext
14 1Cext
13 1Q
12 2Q
11 2CLR
10 2B
9 2A
(Top view)
Function Table
Inputs
Clear
A1
L
X
X
H
X
X
H
L
H
L
Notes: H; high level, L; low level, X; irrelevant
; transition from low to high level
; transition from high to low level
; one high-level pulse
; one low-level pulse
Block Diagram (1/2)
B2
X
X
L
H
H
External parameter
Outputs
Q
Q
L
H
L
H
L
H
A
B
Clear
Cext Rext VCC
/Cext
QQ
QQ
Clear
Rev.2.00, Feb.18.2005, page 2 of 8


Part Number HD74LS123P
Description Dual Retriggerable Monostable Multivibrators
Maker Renesas
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HD74LS123P Datasheet PDF






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