M74HC4538 Datasheet, PDF (1/18 Pages) STMicroelectronics – Dual retriggerable monostable multivibrator

M74HC4538
Dual retriggerable monostable multivibrator
Features
■ High speed:
t_PD = 25 ns (typ.) at V_CC = 6 V
■ Low power dissipation
standby state:
I_CC = 4 μA (max.) at T_A = 25 °C
active state:
I_CC = 200 μA (max.) at V_CC = 6 V
■ High noise immunity:
V_NIH = V_NIL = 28 % V_CC (min.)
■ Symmetrical output impedance:
|I_OH| = I_OL = 4 mA (min.)
■ Balanced propagation delays:
t_PLH ≅ t_PHL
■ Wide operating voltage range:
V_CC (opr) = 2 to 6 V
■ Wide output pulse width range:
t_WOUT = 120 ns ~ 60 s over at V_CC = 4.5 V
■ Pin and function compatible with
74 series 4538
DIP-16
SO-16
TSSOP16
Description
The M74HC4538 is a high speed CMOS monostable
multivibrator fabricated with silicon gate C²MOS
technology.
Each multivibrator features both a negative A, and a
positive B, edge triggered input, either of which can be
used as an inhibit input. Also included is a clear input
that when taken low resets the one shot. The
monostable multivibrators are retriggerable. That is,
they may be triggered repeatedly while their outputs are
generating a pulse and the pulse will be extended.
Pulse width stability over a wide range of temperature
and supply is achieved using linear CMOS techniques.
The output pulse equation is simply: PW = 0.7 (R)(C)
where PW is in seconds, R in Omhs and C is in Farads.
All the inputs are equipped with protection circuits
against static discharge and transient excess voltage.
Table 1.
Device summary
Order code
M74HC4538B1R
M74HC4538RM13TR
M74HC4538TTR
Package
DIP-16
SO-16
TSSOP16
Packaging
Tube
Tape and reel
Tape and reel
May 2008
Rev 2
1/18
www.st.com
18