74HCT4538D NXP Semiconductors, 74HCT4538D Datasheet - Page 2

• Manufacturer Part Number: 74HCT4538D
• Description: LOGIC, 74HCT, MULTIVIBRATOR, SO16
• Manufacturer: NXP Semiconductors

Specifications of 74HCT4538D

• Multivibrator Type: Retriggerable Monostable
• Output Current: 4mA
• Propagation Delay: 35ns
• Logic Case Style: SO
• No. Of Pins: 16
• Supply Voltage Range: 4.5V To 5.5V
• Operating Temperature Range: -40°C To
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Philips Semiconductors
FEATURES
GENERAL DESCRIPTION
The 74HC/HCT4538 are high-speed Si-gate CMOS
devices and are pin compatible with “4538” of the “4000B”
series. They are specified in compliance with JEDEC
standard no. 7A.
The 74HC/HCT4538 are dual retriggerable-resettable
monostable multivibrators. Each multivibrator has an
active LOW trigger/retrigger input (nA
QUICK REFERENCE DATA
GND = 0 V; T
Notes
1. C
2. For HC the condition is V
ORDERING INFORMATION
See
September 1993
t
C
C
PHL
Separate reset inputs
Triggering from leading or trailing edge
Output capability: standard
I
Power-on reset on-chip
Dual retriggerable precision monostable
multivibrator
I
PD
SYMBOL
CC
f
f
C
V
D = duty factor in %
C
For HCT the condition is V
i
o
“74HC/HCT/HCU/HCMOS Logic Package Information”
/ t
CC
PD
= input frequency in MHz
L
EXT
category: MSI
= output frequency in MHz
(C
PLH
= output load capacitance in pF
P
= supply voltage in V
is used to determine the dynamic power dissipation (P
L
D
0.48
= timing capacitance in pF
= C
V
amb
CC
PD
2
propagation delay nA
input capacitance
power dissipation capacitance per multivibrator notes 1 and 2
C
= 25 C; t
EXT
V
f
o
CC
) = sum of outputs
2
V
CC
f
r
i
2
= t
I
f
f
I
o
= GND to V
= 6 ns
= GND to V
(C
PARAMETER
L
D
0
0
V
), an active HIGH
, nA
0.8
CC
2
1
CC
CC
to nQ, nQ
V
f
o
CC
)
1.5 V
where:
2
.
trigger/retrigger input (nA
direct reset input (nR
(nQ), and two pins (nC
external timing components C
variation over temperature range is
The “4538” may be triggered by either the positive or the
negative edges of the input pulse. The duration and
accuracy of the output pulse are determined by the
external timing components C
width (T) is equal to 0.7
techniques guarantee precise control of the output pulse
width.
A LOW level at nR
immediately.
Schmitt-trigger action in the trigger inputs makes the circuit
highly tolerant to slower rise and fall times.
D
in W):
C
L
= 15 pF; V
CONDITIONS
CC
D
D
terminates the output pulse
= 5 V
), an output (nQ) and its complement
TC
1
and nRC
) , an overriding active LOW
R
t
27
3.5
136
t
t
and R
C
74HC/HCT4538
and R
HC
t
. The linear design
TYPICAL
TC
Product specification
t
) for connecting the
. Typical pulse width
t
0.2%.
. The output pulse
30
3.5
138
HCT
ns
pF
pF
UNIT