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參數資料
| 型號： | 74HC4538 |
| 廠商： | 意法半導體 |
| 英文描述： | DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR |
| 中文描述： | 雙RETRIGGERABLE單穩(wěn)態(tài)觸發(fā)器 |
| 文件頁數： | 2/13頁 |
| 文件大?。?/td> | 149K |
| 代理商： | 74HC4538 |
September 1993
2
Philips Semiconductors
Product specification
Dual retriggerable precision monostable
multivibrator
74HC/HCT4538
FEATURES
Separate reset inputs
Triggering from leading or trailing edge
Output capability: standard
I
CC
category: MSI
Power-on reset on-chip
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
0
), an active HIGH
trigger/retrigger input (nA
1
) , an overriding active LOW
direct reset input (nR
D
), an output (nQ) and its complement
(nQ), and two pins (nC
TC
and nRC
TC
) for connecting the
external timing components C
t
and R
t
. Typical pulse width
variation over temperature range is
±
0.2%.
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
t
and R
t
. The output pulse
width (T) is equal to 0.7
×
R
t
×
C
t
. The linear design
techniques guarantee precise control of the output pulse
width.
A LOW level at nR
D
terminates the output pulse
immediately.
Schmitt-trigger action in the trigger inputs makes the circuit
highly tolerant to slower rise and fall times.
QUICK REFERENCE DATA
GND = 0 V; T
amb
= 25
°
C; t
r
= t
f
= 6 ns
Notes
1.
C
PD
is used to determine the dynamic power dissipation (P
D
in
μ
W):
P
D
= C
PD
×
V
CC2
×
f
i
+ ∑
(C
L
×
V
CC2
×
f
o
)
+
+
0.48
×
C
EXT
×
V
CC2
×
f
o
+
D
×
0.8
×
V
CC
where:
f
i
= input frequency in MHz
f
o
= output frequency in MHz
∑
(C
L
×
V
CC2
×
f
o
) = sum of outputs
C
L
= output load capacitance in pF
V
CC
= supply voltage in V
D = duty factor in %
C
EXT
= timing capacitance in pF
For HC the condition is V
I
= GND to V
CC
For HCT the condition is V
I
= GND to V
CC
1.5 V
2.
ORDERING INFORMATION
See
“74HC/HCT/HCU/HCMOS Logic Package Information”
.
SYMBOL
PARAMETER
CONDITIONS
TYPICAL
UNIT
HC
HCT
t
PHL
/ t
PLH
C
I
C
PD
propagation delay nA
0
, nA
1
to nQ, nQ
input capacitance
power dissipation capacitance per multivibrator
C
L
= 15 pF; V
CC
= 5 V
27
3.5
136
30
3.5
138
ns
pF
pF
notes 1 and 2
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| 74HC4538D,652 | 功能描述:單穩(wěn)態(tài)多諧振蕩器 DUAL MONO RETRIG RoHS:否 制造商:Texas Instruments 每芯片元件:1 邏輯系列:LVC 邏輯類型:Monostable Multivibrator 封裝 / 箱體:SSOP-8 傳播延遲時間:18.6 ns 高電平輸出電流:- 32 mA 低電平輸出電流:32 mA 電源電壓-最大:5.5 V 電源電壓-最小:1.65 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Reel |
| 74HC4538D,653 | 功能描述:單穩(wěn)態(tài)多諧振蕩器 DUAL RETRIG PRECISION MONOSTAT RoHS:否 制造商:Texas Instruments 每芯片元件:1 邏輯系列:LVC 邏輯類型:Monostable Multivibrator 封裝 / 箱體:SSOP-8 傳播延遲時間:18.6 ns 高電平輸出電流:- 32 mA 低電平輸出電流:32 mA 電源電壓-最大:5.5 V 電源電壓-最小:1.65 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Reel |
| 74HC4538D | 制造商:NXP Semiconductors 功能描述:74HC CMOS SMD 74HC4538 SOIC16 |
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