74221 [TI]

High Speed CMOS Logic Dual Monostable Multivibrator with Reset; 高速CMOS逻辑双路单稳多谐振荡器与重置
74221
型号: 74221
厂家: TEXAS INSTRUMENTS    TEXAS INSTRUMENTS
描述:

High Speed CMOS Logic Dual Monostable Multivibrator with Reset
高速CMOS逻辑双路单稳多谐振荡器与重置

振荡器
文件: 总11页 (文件大小:68K)
中文:  中文翻译
下载:  下载PDF数据表文档文件
CD74HC221,  
CD74HCT221  
Data sheet acquired from Harris Semiconductor  
SCHS166A  
High Speed CMOS Logic  
November 1997 - Revised April 1999  
Dual Monostable Multivibrator with Reset  
Features  
Description  
• Overriding RESET Terminates Output Pulse  
• Triggering from the Leading or Trailing Edge  
• Q and Q Buffered Outputs  
The CD74HC221, and CH74HCT221 are dual monostable  
multivibrators with reset. An external resistor (R ) and an  
X
[ /Title  
(CD74  
HC221  
,
CD74  
HCT22  
1)  
external capacitor (C ) control the timing and the accuracy  
X
for the circuit. Adjustment of R and C provides a wide  
X
X
range of output pulse widths from the Q and Q terminals.  
Pulse triggering on the B input occurs at a particular voltage  
level and is not related to the rise and fall time of the trigger  
pulse.  
• Separate Resets  
• Wide Range of Output-Pulse Widths  
• Schmitt Trigger on B Inputs  
• Fanout (Over Temperature Range)  
Once triggered, the outputs are independent of further trigger  
inputs on A and B. The output pulse can be terminated by a  
- Standard Outputs. . . . . . . . . . . . . . . 10 LSTTL Loads  
- Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads LOW level on the Reset (R) pin. Trailing Edge triggering (A)  
/Sub-  
ject  
and leading-edge-triggering (B) inputs are provided for  
triggering from either edge of the input pulse. On power up,  
the IC is reset. If either Mono is not used each input (on the  
unused device) must be terminated either high or low.  
o
o
• Wide Operating Temperature Range . . . -55 C to 125 C  
• Balanced Propagation Delay and Transition Times  
(High  
Speed  
CMOS  
Logic  
Dual  
Monos  
table  
Multi-  
• Significant Power Reduction Compared to LSTTL  
Logic ICs  
The minimum value of external resistance, R , is typically 500.  
X
• HC Types  
The minimum value of external capacitance, C , is 0pF. The  
X
calculation for the pulse width is t = 0.7 R C at V = 4.5V.  
- 2V to 6V Operation  
W
X X  
CC  
- High Noise Immunity: N = 30%, N = 30% of V  
CC  
IL  
IH  
Ordering Information  
at V  
= 5V  
CC  
PKG.  
NO.  
• HCT Types  
o
PART NUMBER TEMP. RANGE ( C) PACKAGE  
- 4.5V to 5.5V Operation  
CD74HC221E  
CD74HCT221E  
CD74HC221M  
CD74HCT221M  
NOTES:  
-55 to 125  
-55 to 125  
-55 to 125  
-55 to 125  
16 Ld PDIP  
16 Ld PDIP  
E16.3  
E16.3  
- Direct LSTTL Input Logic Compatibility,  
V = 0.8V (Max), V = 2V (Min)  
IL IH  
- CMOS Input Compatibility, I 1µA at V , V  
OL OH  
l
16 Ld SOIC M16.15  
16 Ld SOIC M16.15  
1. When ordering, use the entire part number. Add the suffix 96 to  
obtain the variant in the tape and reel.  
2. Wafer or die are available which meets all electrical  
specifications. Please contact your local sales office or Harris  
customer service for ordering information.  
Pinout  
CD74HC221, CD74HCT221  
(PDIP, SOIC)  
TOP VIEW  
1A  
1B  
1R  
1Q  
2Q  
1
2
3
4
5
6
7
8
16 V  
CC  
15 1C R  
X
X
14 1C  
X
13 1Q  
12 2Q  
11 2R  
10 2B  
2C  
X
X
2C R  
X
9
2A  
GND  
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.  
File Number 1670.1  
Copyright © Harris Corporation 1997  
1
CD74HC221, CD74HCT221  
Functional Diagram  
1C  
1R  
X
X
V
CC  
14  
15  
1C R  
1C  
X
X
X
13  
4
1A  
1Q  
1Q  
1
2
MONO 1  
1B  
1R  
3
11  
2R  
2A  
5
9
2Q  
2Q  
MONO 2  
12  
10  
2B  
2C  
2C R  
X
X
X
6
7
V
CC  
2C  
2R  
X
X
TRUTH TABLE  
INPUTS  
OUTPUTS  
A
H
X
L
B
X
L
R
H
H
H
Q
Q
H
H
L
L
H
H
X
L
X
H
L
L
H
(Note 3)  
(Note 3)  
NOTE:  
H = High Voltage Level, L = Low Voltage Level, X = Irrelevant, = Transition from Low  
to High Level, = Transition from High to Low Level,  
= One High Level Pulse,  
= One Low Level Pulse  
3. For this combination the reset input must be low and the following sequence must  
be used: pin 1 (or 9) must be set high or pin 2 (or 10) set low; then pin 1 (or 9)  
must be low and pin 2 (or 10) set high. Now the reset input goes from low-to-high  
and the device will be triggered.  
2
CD74HC221, CD74HCT221  
Logic Diagram  
V
CC  
16  
C
P
R
N
X
A
B
R
1 (9)  
2 (10)  
3 (11)  
P
V
CC  
P
OP  
AMP  
R2  
R3  
R
D
C
RESET  
FF  
15 (7)  
R C  
-
+
X
X
Q
C
S
R
V
CC  
MIRROR VOLTAGE  
QM  
QM  
P P  
C
X
R
Q
MASK  
FF  
R1  
S
MAIN  
FF  
R4  
Q
PULLDOWN  
FF  
14 (6)  
N
V
CC  
C
8
X
D
C
C
Q
N
GND  
Q
4 (12)  
(13) 5  
R
Q
Q
+
-
OP AMP  
3
CD74HC221, CD74HCT221  
Absolute Maximum Ratings  
Thermal Information  
o
o
DC Supply Voltage, V  
. . . . . . . . . . . . . . . . . . . . . . . . -0.5V to 7V Thermal Resistance (Typical, Note 4)  
θ
( C/W)  
θ
( C/W)  
CC  
DC Input Diode Current, I  
JA  
JC  
PDIP Package . . . . . . . . . . . . . . . . . . .  
SOIC Package. . . . . . . . . . . . . . . . . . .  
100  
180  
N/A  
N/A  
IK  
For V < -0.5V or V > V  
+ 0.5V. . . . . . . . . . . . . . . . . . . . . .±20mA  
OK  
For V < -0.5V or V > V  
I
I
CC  
o
DC Output Diode Current, I  
Maximum Junction Temperature (Plastic Package) . . . . . . . . 150 C  
Maximum Storage Temperature Range . . . . . . . . . .-65 C to 150 C  
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . . 300 C  
o
o
+ 0.5V . . . . . . . . . . . . . . . . . . . .±20mA  
O
O
CC  
o
DC Drain Current, per Output, I  
O
For -0.5V < V < V  
+ 0.5V. . . . . . . . . . . . . . . . . . . . . . . . . .±25mA  
(SOIC - Lead Tips Only)  
O
CC  
DC Output Source or Sink Current per Output Pin, I  
O
For V > -0.5V or V < V  
+ 0.5V . . . . . . . . . . . . . . . . . . . .±25mA  
O
O
CC  
DC V  
or Ground Current, I  
. . . . . . . . . . . . . . . . . . . . . . . . .±50mA  
CC  
CC  
Operating Conditions  
o
o
Temperature Range, T . . . . . . . . . . . . . . . . . . . . . . -55 C to 125 C  
A
Supply Voltage Range, V  
CC  
HC Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2V to 6V  
HCT Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4.5V to 5.5V  
DC Input or Output Voltage, V , V . . . . . . . . . . . . . . . . . 0V to V  
I
O
CC  
Input Rise and Fall Time, t , t on Inputs A and R  
r
f
2V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000ns (Max)  
4.5V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500ns (Max)  
6V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400ns (Max)  
Input Rise and Fall Time, t , t on Input B  
r
f
2V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Unlimited ns (Max)  
4.5V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Unlimited ns (Max)  
6V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Unlimited ns (Max)  
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation  
of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.  
NOTE:  
4. θ is measured with the component mounted on an evaluation PC board in free air.  
JA  
DC Electrical Specifications  
TEST  
CONDITIONS  
o
o
o
o
o
25 C  
TYP  
-40 C TO 85 C -55 C TO 125 C  
V
(V)  
CC  
PARAMETER  
HC TYPES  
SYMBOL  
V (V)  
I
I
(mA)  
MIN  
MAX  
MIN  
MAX  
MIN  
MAX  
UNITS  
O
High Level Input  
Voltage  
V
-
-
-
2
4.5  
6
1.5  
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
1.5  
-
1.5  
-
-
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
IH  
3.15  
-
3.15  
-
3.15  
4.2  
-
0.5  
1.35  
1.8  
-
4.2  
-
0.5  
1.35  
1.8  
-
4.2  
-
Low Level Input  
Voltage  
V
-
2
-
-
-
0.5  
1.35  
1.8  
-
IL  
4.5  
6
-
-
-
-
-
-
1.9  
4.4  
5.9  
-
High Level Output  
Voltage  
CMOS Loads  
V
V
or V  
IH IL  
-0.02  
2
1.9  
1.9  
OH  
-0.02  
-0.02  
-
4.5  
6
4.4  
-
4.4  
-
-
5.9  
-
5.9  
-
-
High Level Output  
Voltage  
TTL Loads  
-
-
-
-
-
-
-4  
4.5  
6
3.98  
-
3.84  
-
3.7  
5.2  
-
-
-5.2  
0.02  
0.02  
0.02  
-
5.48  
-
5.34  
-
-
Low Level Output  
Voltage  
CMOS Loads  
V
V
or V  
IH IL  
2
-
-
-
-
-
-
0.1  
0.1  
0.1  
-
-
-
-
-
-
-
0.1  
0.1  
0.1  
-
0.1  
0.1  
0.1  
-
OL  
4.5  
6
-
-
Low Level Output  
Voltage  
TTL Loads  
-
-
4
4.5  
6
0.26  
0.26  
0.33  
0.33  
-
0.4  
0.4  
5.2  
-
4
CD74HC221, CD74HCT221  
DC Electrical Specifications (Continued)  
TEST  
CONDITIONS  
o
o
o
o
o
25 C  
-40 C TO 85 C -55 C TO 125 C  
V
CC  
PARAMETER  
Input Leakage  
SYMBOL  
V (V)  
I
(mA)  
(V)  
MIN  
TYP  
MAX  
MIN  
MAX  
MIN  
MAX  
UNITS  
I
O
I
V
or  
-
6
-
-
±0.1  
-
±1  
-
±1  
µA  
I
CC  
Current  
GND  
Quiescent Device  
Current  
I
V
GND  
or  
0
6
-
-
8
-
80  
-
160  
µA  
CC  
CC  
HCT TYPES  
High Level Input  
Voltage  
V
-
-
-
-
4.5 to  
5.5  
2
-
-
-
-
-
0.8  
-
2
-
-
0.8  
-
2
-
-
0.8  
-
V
V
V
IH  
Low Level Input  
Voltage  
V
4.5 to  
5.5  
IL  
High Level Output  
Voltage  
CMOS Loads  
V
V
V
or V  
-0.02  
4.5  
4.5  
4.5  
4.5  
4.4  
4.4  
4.4  
OH  
IH  
IH  
IL  
High Level Output  
Voltage  
TTL Loads  
-4  
3.98  
-
-
-
-
3.84  
-
3.7  
-
V
V
V
Low Level Output  
Voltage  
CMOS Loads  
V
or V  
0.02  
4
-
-
0.1  
0.26  
-
-
0.1  
0.33  
-
-
0.1  
0.4  
OL  
IL  
Low Level Output  
Voltage  
TTL Loads  
Input Leakage  
Current  
I
V
and  
0
0
-
5.5  
5.5  
-
-
-
±0.1  
8
-
-
-
±1  
80  
-
-
-
±1  
µA  
µA  
µA  
I
CC  
GND  
Quiescent Device  
Current  
I
V
or  
-
160  
490  
CC  
CC  
GND  
Additional Quiescent  
Device Current Per  
Input Pin: 1 Unit Load  
I  
V
4.5 to  
5.5  
100  
360  
450  
CC  
CC  
-2.1  
NOTE: For dual-supply systems theoretical worst case (V = 2.4V, V  
I
= 5.5V) specification is 1.8mA.  
CC  
HCT Input Loading Table  
INPUT  
All Inputs  
UNIT LOADS  
0.3  
NOTE: Unit Load is I  
360µA max at 25 C.  
limit specified in DC Electrical Table, e.g.,  
CC  
o
Prerequisite For Switching Function  
o
o
o
o
o
25 C  
TYP  
-40 C TO 85 C  
-55 C TO 125 C  
PARAMETER  
HC TYPES  
SYMBOL  
V
(V)  
MIN  
MAX  
MIN  
MAX  
MIN  
MAX  
UNITS  
CC  
Input Pulse Width  
A
t
2
70  
14  
12  
70  
14  
12  
-
-
-
-
-
-
-
-
-
-
-
-
90  
18  
15  
90  
18  
15  
-
-
-
-
-
-
105  
21  
-
-
-
-
-
-
ns  
ns  
ns  
ns  
ns  
ns  
WL  
4.5  
6
2
18  
Input Pulse Width  
B
t
105  
21  
WH  
4.5  
6
18  
5
CD74HC221, CD74HCT221  
Prerequisite For Switching Function (Continued)  
o
o
o
o
o
25 C  
-40 C TO 85 C  
-55 C TO 125 C  
PARAMETER  
Input Pulse Width  
SYMBOL  
V
(V)  
MIN  
70  
14  
12  
0
TYP  
MAX  
MIN  
90  
18  
15  
0
MAX  
MIN  
105  
21  
18  
0
MAX  
UNITS  
ns  
CC  
t
2
-
-
-
-
-
-
-
-
-
-
WL  
Reset  
4.5  
-
-
-
ns  
6
2
-
-
-
ns  
Recovery Time  
R to A or B  
t
-
-
-
ns  
SU  
4.5  
6
0
-
-
0
-
-
0
-
-
ns  
0
0
0
ns  
Output Pulse Width Q or Q  
t
5
630  
770  
602  
798  
595  
805  
µs  
W
C
= 0.1µF R = 10kΩ  
X
X
Output Pulse Width Q or Q  
t
4.5  
-
140  
-
-
-
-
-
ns  
W
C
C
C
= 28pF, R = 2kΩ  
X
X
X
X
= 1000pF, R = 2kΩ  
t
t
4.5  
4.5  
-
-
1.5  
7
-
-
-
-
-
-
-
-
-
-
µs  
µs  
X
W
= 1000pF, R = 10kΩ  
X
W
HCT TYPES  
Input Pulse Width  
A
t
4.5  
4.5  
4.5  
4.5  
5
14  
14  
18  
0
-
-
18  
18  
23  
0
-
21  
21  
27  
0
-
ns  
ns  
ns  
ns  
µs  
ns  
WL  
Input Pulse Width  
B
t
-
-
-
-
WH  
Input Pulse Width  
Reset  
t
-
-
-
-
WL  
Recovery Time  
R to A or B  
t
-
-
-
770  
-
-
798  
-
-
805  
-
SU  
Output Pulse Width Q or Q  
t
630  
-
602  
-
595  
-
W
W
C
= 0.1µF R = 10kΩ  
X
X
Output Pulse Width Q or Q  
t
4.5  
140  
C
C
C
= 28pF, R = 2kΩ  
X
X
X
X
= 1000pF, R = 2kΩ  
t
t
4.5  
4.5  
-
-
1.5  
7
-
-
-
-
-
-
-
-
-
-
µs  
µs  
X
W
= 1000pF, R = 10kΩ  
X
W
Switching Specifications Input t , t = 6ns  
r
f
o
o
-40 C TO  
-55 C TO  
o
o
o
25 C  
85 C  
125 C  
TEST  
PARAMETER  
HC TYPES  
SYMBOL CONDITIONS  
V
(V) MIN  
TYP MAX  
MIN  
MAX  
MIN  
MAX UNITS  
CC  
Propagation Delay,  
Trigger A, B, R to Q  
t
C = 50pF  
2
-
-
-
210  
42  
36  
-
-
-
-
-
-
-
-
-
265  
53  
45  
-
-
-
-
-
-
-
-
-
315  
63  
54  
-
ns  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
PLH  
PHL  
L
C = 50pF  
4.5  
6
-
-
-
-
-
-
-
L
C = 50pF  
-
L
C = 15pF  
5
18  
-
L
Propagation Delay,  
Trigger A, B, R to Q  
t
C = 50pF  
2
170  
34  
29  
-
215  
43  
37  
-
255  
51  
43  
-
L
C = 50pF  
4.5  
6
-
L
C = 50pF  
-
L
C = 15pF  
5
14  
L
6
CD74HC221, CD74HCT221  
Switching Specifications Input t , t = 6ns (Continued)  
r
f
o
o
-40 C TO  
-55 C TO  
o
o
o
25 C  
85 C  
125 C  
TEST  
PARAMETER  
Propagation Delay,  
SYMBOL CONDITIONS  
V
(V) MIN  
TYP MAX  
MIN  
MAX  
MIN  
MAX UNITS  
CC  
t
C = 50pF  
2
-
-
-
160  
32  
27  
180  
36  
31  
75  
15  
13  
10  
-
-
-
-
-
-
-
-
-
-
-
-
200  
40  
34  
225  
45  
38  
95  
19  
16  
10  
-
-
-
-
-
-
-
-
-
-
-
-
240  
48  
41  
270  
54  
46  
110  
22  
19  
10  
-
ns  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
pF  
%
PLH  
L
R to Q  
4.5  
6
-
-
-
-
-
-
-
-
-
-
-
Propagation Delay,  
R to Q  
t
C = 50pF  
2
-
PHL  
L
4.5  
6
-
-
Output Transition Time  
Input Capacitance  
t
, t  
TLH THL  
C = 50pF  
L
2
-
4.5  
6
-
-
C
-
-
-
-
IN  
Pulse Width Match Between  
Circuits in the Same Package  
4.5 to  
5.5  
±2  
C
= 1000pF, R = 10kΩ  
X
X
Power Dissipation Capacitance  
(Notes 5, 6)  
CPD  
-
5
-
166  
-
-
-
-
-
pF  
HCT TYPES  
Propagation Delay,  
Trigger A, B, R to Q  
t
t
C = 50pF  
4.5  
5
-
-
-
-
-
-
18  
-
42  
-
-
-
-
-
-
-
-
-
-
-
-
-
63  
-
ns  
ns  
ns  
ns  
ns  
PLH  
L
C = 15pF  
L
Propagation Delay,  
Trigger A, B, R to Q  
C = 50pF  
4.5  
5
34  
-
43  
-
51  
-
PHL  
L
C = 15pF  
14  
-
L
Propagation Delay,  
R to Q  
t
t
C = 50pF  
4.5  
38  
-
57  
PLH  
L
Propagation Delay,  
R to Q  
C = 50pF  
4.5  
-
-
37  
-
-
-
56  
ns  
PHL  
L
Output Transition Time  
Input Capacitance  
t
, t  
TLH THL  
C = 50pF  
L
2
4.5  
6
-
-
-
-
-
-
-
75  
15  
13  
10  
-
-
-
-
-
-
95  
19  
16  
10  
-
-
-
-
-
-
110  
22  
19  
10  
-
ns  
ns  
ns  
pF  
%
-
C
-
-
-
-
IN  
Pulse Width Match Between  
Circuits in the Same Package  
4.5 to  
5.5  
±2  
C
= 1000pF, R = 10kΩ  
X
X
Power Dissipation Capacitance  
(Notes 5, 6)  
CPD  
-
5
-
166  
-
-
-
-
-
pF  
NOTES:  
5. C  
PD  
is used to determine the dynamic power consumption, per multivibrator.  
2
6. P = (C  
PD  
+ C ) V  
CC  
f + Σ where f = input frequency, f = output frequency, C = output load capacitance, V  
= supply voltage.  
CC  
D
L
i
i
o
L
7
CD74HC221, CD74HCT221  
Test Circuits and Waveforms  
I
t
+ t =  
WH  
WL  
I
t C = 6ns  
fC  
r
L
t
+ t  
=
L
WL  
WH  
t C = 6ns  
t C  
f
L
fC  
t C  
f
L
L
r
L
3V  
V
CC  
90%  
10%  
2.7V  
0.3V  
CLOCK  
CLOCK  
50%  
10%  
1.3V  
0.3V  
50%  
t
50%  
1.3V  
t
1.3V  
GND  
GND  
t
t
WH  
WL  
WH  
WL  
NOTE: Outputs should be switching from 10% V  
to 90% V  
in  
NOTE: Outputs should be switching from 10% V  
to 90% V  
in  
CC  
CC  
CC  
CC  
accordance with device truth table. For f  
, input duty cycle = 50%. accordance with device truth table. For f , input duty cycle = 50%.  
MAX  
MAX  
FIGURE 1. HC CLOCK PULSE RISE AND FALL TIMES AND  
PULSE WIDTH  
FIGURE 2. HCT CLOCK PULSE RISE AND FALL TIMES AND  
PULSE WIDTH  
t = 6ns  
t = 6ns  
t = 6ns  
t = 6ns  
r
f
r
f
V
3V  
CC  
90%  
50%  
10%  
2.7V  
1.3V  
0.3V  
INPUT  
INPUT  
GND  
GND  
t
t
t
t
THL  
TLH  
THL  
TLH  
90%  
1.3V  
90%  
50%  
10%  
INVERTING  
OUTPUT  
INVERTING  
OUTPUT  
10%  
t
t
PLH  
PHL  
t
t
PLH  
PHL  
FIGURE 3. HC TRANSITION TIMES AND PROPAGATION  
DELAY TIMES, COMBINATION LOGIC  
FIGURE 4. HCT TRANSITION TIMES AND PROPAGATION  
DELAY TIMES, COMBINATION LOGIC  
8
CD74HC221, CD74HCT221  
Typical Performance Curves  
685  
R
V
= 10K  
= 5V  
R
= 10K  
o
X
X
T
= 25 C  
CC  
A
680  
675  
0.9  
0.8  
HCT  
C
= 1µF  
X
670  
665  
0.7  
0.6  
-75 -50 -25  
0
25  
50  
75 100 125 150 175  
o
0
2
4
6
8
10  
T , AMBIENT TEMPERATURE ( C)  
V
, SUPPLY VOLTAGE (V)  
A
CC  
FIGURE 5. HC/HCT221 OUTPUT PULSE WIDTH vs  
TEMPERATURE  
FIGURE 6. HC/HCT221 K FACTOR vs SUPPLY VOLTAGE  
6
6
10  
10  
V
= 4.5V  
CC  
V
= 2V  
CC  
5
4
3
2
5
10  
10  
10  
10  
10  
10  
10  
10  
4
3
2
R
= 100K  
R
= 100K  
X
X
R
R
= 50K  
= 10K  
X
R
R
= 50K  
= 10K  
X
X
10  
1
X
10  
1
R
= 2K  
X
R
= 2K  
X
0.1  
0.1  
2
3
4
5
6
7
8
10  
2
3
4
5
6
7
8
10  
10  
10  
10  
10  
10  
10  
10  
10  
10  
10  
10  
10  
10  
10  
C , TIMING CAPACITANCE (pF)  
C , TIMING CAPACITANCE (pF)  
X
X
FIGURE 7. HC221 OUTPUT PULSE WIDTH vs C  
FIGURE 8. HC/HCT221 OUTPUT PULSE WIDTH vs C  
X
X
9
Typical Performance Curves (Continued)  
685  
R
V
= 10K  
= 5V  
R
= 10K  
o
X
X
T
= 25 C  
CC  
A
680  
675  
0.9  
0.8  
HCT  
C
= 1µF  
X
670  
665  
0.7  
0.6  
-75 -50 -25  
0
25  
50  
75 100 125 150 175  
o
0
2
4
6
8
10  
T , AMBIENT TEMPERATURE ( C)  
V
, SUPPLY VOLTAGE (V)  
A
CC  
FIGURE 5. HC/HCT221 OUTPUT PULSE WIDTH vs  
TEMPERATURE  
FIGURE 6. HC/HCT221 K FACTOR vs SUPPLY VOLTAGE  
6
10  
V
= 6V  
CC  
5
10  
4
3
2
10  
10  
10  
R
= 100K  
X
R
R
= 50K  
= 10K  
X
X
10  
R
= 2K  
X
1
0.1  
2
3
4
5
6
7
8
10  
10  
10  
10  
10  
10  
10  
10  
C , TIMING CAPACITANCE (pF)  
X
FIGURE 9. HC221 OUTPUT PULSE WIDTH vs C  
X
10  
IMPORTANT NOTICE  
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any product or service without notice, and advise customers to obtain the latest version of relevant information  
to verify, before placing orders, that information being relied on is current and complete. All products are sold  
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pertaining to warranty, patent infringement, and limitation of liability.  
TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in  
accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent  
TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily  
performed, except those mandated by government requirements.  
CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF  
DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL  
APPLICATIONS”). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR  
WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER  
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BE FULLY AT THE CUSTOMER’S RISK.  
In order to minimize risks associated with the customer’s applications, adequate design and operating  
safeguards must be provided by the customer to minimize inherent or procedural hazards.  
TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent  
that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other  
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Copyright 1999, Texas Instruments Incorporated  

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