HD74LS123 Datasheet, PDF (1/9 Pages) Hitachi Semiconductor – Dual Retriggerable Monostable Multivibrators(with Clear)

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"
t_w + t_PLH
"H"
t_w
"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