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參數(shù)資料
| 型號(hào)： | 74221 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | High Speed CMOS Logic Dual Monostable Multivibrator with Reset |
| 中文描述： | 高速CMOS邏輯雙單穩(wěn)態(tài)觸發(fā)器的復(fù)位 |
| 文件頁(yè)數(shù)： | 2/15頁(yè) |
| 文件大?。?/td> | 250K |
| 代理商： | 74221 |
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December 1990
2
Philips Semiconductors
Product specification
Dual non-retriggerable monostable
multivibrator with reset
74HC/HCT221
FEATURES
Pulse width variance is typically less than
±
5%
Pin-out identical to “123”
Overriding reset terminates output pulse
nB inputs have hysteresis for improved noise immunity
Output capability: standard (except for nR
EXT
/C
EXT
)
I
CC
category: MSI
GENERAL DESCRIPTION
The 74HC/HCT221 are high-speed Si-gate CMOS devices
and are pin compatible with low power Schottky TTL
(LSTTL). They are specified in compliance with JEDEC
standard no. 7A.
The 74HC/HCT221 are dual non-retriggerable monostable
multivibrators. Each multivibrator features an active
LOW-going edge input (nA) and an active HIGH-going
edge input (nB), either of which can be used as an enable
input.
Pulse triggering occurs at a particular voltage level and is
not directly related to the transition time of the input pulse.
Schmitt-trigger input circuitry for the nB inputs allow
jitter-free triggering from inputs with slow transition rates,
providing the circuit with excellent noise immunity.
Once triggered, the outputs (nQ, nQ) are independent of
further transitions of nA and nB inputs and are a function
of the timing components. The output pulses can be
terminated by the overriding active LOW reset inputs
(nR
D
). Input pulses may be of any duration relative to the
output pulse.
Pulse width stability is achieved through internal
compensation and is virtually independent of V
CC
and
temperature. In most applications pulse stability will only
be limited by the accuracy of the external timing
components.
The output pulse width is defined by the following
relationship:
t
W
= C
EXT
R
EXT
In
2
t
W
= 0.7C
EXT
R
EXT
Pin assignments for the “221” are identical to those of the
“123” so that the “221” can be substituted for those
products in systems not using the retrigger by merely
changing the value of R
EXT
and/or C
EXT
.
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
)
+
0.33
×
C
EXT
×
V
CC2
×
f
o
+
D
×
28
×
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
EXT
= timing capacitance in pF; C
L
= output load capacitance in pF
V
CC
= supply voltage in V; D = duty factor in %
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.
SYMBOL
PARAMETER
CONDITIONS
TYPICAL
UNIT
HC
HCT
propagation delay
nA, nB, nR
D
to nQ, nQ
nA, nB, nR
D
to nQ, nQ
input capacitance
power dissipation capacitance per package notes 1 and 2
C
L
= 15 pF; V
CC
= 5 V;
R
EXT
= 5 k
; C
EXT
= 0 pF
t
PHL
t
PLH
C
I
C
PD
29
35
3.5
90
32
36
3.5
96
ns
ns
pF
pF
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| 74221-001 | 功能描述:板對(duì)板與夾層連接器 400 POS. MEG ARRAY RoHS:否 制造商:JAE Electronics 系列:WP3 產(chǎn)品類型:Receptacles 節(jié)距:0.4 mm 疊放高度:1 mm 安裝角: 位置/觸點(diǎn)數(shù)量:50 排數(shù):2 外殼材料:Plastic 觸點(diǎn)材料:Copper Alloy 觸點(diǎn)電鍍:Gold 電壓額定值:50 V 電流額定值:0.4 A |
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| 74221-091LF | 功能描述:400 Position Connector Array, Female Sockets Surface Mount Gold, GXT? 制造商:amphenol fci 系列:MEG-Array?，MezzSelect?? 包裝:帶卷（TR） 零件狀態(tài):有效 連接器類型:母插口陣列 針腳數(shù):400 間距:0.050"（1.27mm） 排數(shù):10 安裝類型:表面貼裝 特性:- 觸頭鍍層:金，GXT? 觸頭鍍層厚度:15μin（0.38μm） 接合堆疊高度:4mm，10mm 板上高度:0.132"（3.35mm） 標(biāo)準(zhǔn)包裝:250 |
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