ICM7555ID [NXP]
General purpose CMOS timer; 通用CMOS计时器
| 型号： | ICM7555ID |
| 厂家： | 
NXP |
| 描述： | General purpose CMOS timer |
| 文件： | 总9页 (文件大小：109K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Philips Semiconductors Linear Products
Product specification
General purpose CMOS timer
ICM7555
DESCRIPTION
PIN CONFIGURATION
The ICM7555 is a CMOS timer providing significantly improved
performance over the standard NE/SE555 timer, while at the same
time being a direct replacement for those devices in most
applications. Improved parameters include low supply current, wide
operating supply voltage range, low THRESHOLD, TRIGGER, and
RESET currents, no crowbarring of the supply current during output
transitions, higher frequency performance and no requirement to
decouple CONTROL VOLTAGE for stable operation.
D and N Packages
1
2
3
4
8
7
6
5
V
DD
GND
TRIGGER
DISCHARGE
OUTPUT
RESET
THRESHOLD
CONTROL VOLTAGE
The ICM7555 is a stable controller capable of producing accurate
time delays or frequencies.
• Timing from microseconds through hours
• Operates in both astable and monostable modes
• Adjustable duty cycle
In the one-shot mode, the pulse width of each circuit is precisely
controlled by one external resistor and capacitor. For astable
operation as an oscillator, the free-running frequency and the duty
cycle are both accurately controlled by two external resistors and
one capacitor. Unlike the bipolar 555 device, the CONTROL
VOLTAGE terminal need not be decoupled with a capacitor. The
TRIGGER and RESET inputs are active low. The output inverter can
source or sink currents large enough to drive TTL loads or provide
minimal offsets to drive CMOS loads.
• High output source/sink driver can drive TTL/CMOS
°
o
• Typical temperature stability of 0.005%/ C at 25 C
• Rail-to-rail outputs
APPLICATIONS
FEATURES
• Precision timing
• Exact equivalent in most applications for NE/SE555
• Pulse generation
• Low supply current: 80µA (typ)
• Sequential timing
• Extremely low trigger, threshold, and reset currents: 20pA (typ)
• High-speed operation: 500kHz guaranteed
• Time delay generation
• Pulse width modulation
• Pulse position modulation
• Missing pulse detector
• Wide operating supply voltage range guaranteed 3 to 16V over full
automotive temperatures
• Normal reset function; no crowbarring of supply during output
transition
• Can be used with higher-impedance timing elements than the
bipolar 555 for longer time constants
ORDERING INFORMATION
DESCRIPTION
8-Pin Plastic Dual In-Line Package (DIP)
8-Pin Plastic Small Outline (SO) Package
8-Pin Plastic Dual In-Line Package (DIP)
8-Pin Plastic Small Outline (SO) Package
TEMPERATURE RANGE
0 to +70°C
ORDER CODE
ICM7555CN
ICM7555CD
ICM7555IN
DWG #
0404B
0174C
0404B
0174C
0 to +70°C
-40 to +85°C
-40 to +85°C
ICM7555ID
337
August 31, 1994
853-1192 13721
Philips Semiconductors Linear Products
Product specification
General purpose CMOS timer
ICM7555
EQUIVALENT BLOCK DIAGRAM
FLIP–FLOP
RESET
V
DD
8
4
R
COMPARATOR
OUTPUT
DRIVERS
A
6
5
THRESHOLD
+
3
OUTPUT
CONTROL
VOLTAGE
–
DISCHARGE
7
R
R
COMPARATOR
B
+
N
1
2
–
TRIGGER
1
NOTE:
UNUSED INPUTS SHOULD BE CONNECTED TO APPROPRIATE VOLTAGE FROM TRUTH TABLE.
TRUTH TABLE
1
THRESHOLD VOLTAGE
TRIGGER VOLTAGE
DON’T CARE
> 1/3(V+)
RESET
OUTPUT
LOW
DISCHARGE SWITCH
DON’T CARE
LOW
ON
ON
>2/3(V+)
HIGH
HIGH
HIGH
LOW
V
TH
< 2/3
V
TR
> 1/3
STABLE
HIGH
STABLE
OFF
DON’T CARE
NOTES:
<1/3(V+)
1. RESET will dominate all other inputs: TRIGGER will dominate over THRESHOLD.
1
ABSOLUTE MAXIMUM RATINGS
SYMBOL
PARAMETER
RATING
+18
UNITS
V
DD
Supply voltage
V
1
V
Trigger input voltage
Control voltage
TRIG
V
V
> -0.3 to
CV
TH
Threshold input voltage
RESET input voltage
Output current
<V + 0.3
DD
V
V
RST
OUT
I
100
mA
2
P
DMAX
Maximum power dissipation, T = 25°C (still air)
A
N package
D package
1160
780
mW
mW
°C
°C
T
Storage temperature range
-65 to +150
300
STG
T
SOLD
Lead temperature (Soldering 60s)
NOTES:
1. Due to the SCR structure inherent in the CMOS process used to fabricate these devices, connecting any terminal to a voltage greater than
+ 0.3V or less than GND -0.3V may cause destructive latch-up. For this reason it is recommended that no inputs from external sources
V
DD
not operating from the same power supply be applied to the device before its power supply is established. In multiple systems, the supply of
the ICM7555 must be turned on first.
2. Derate above 25°C, at the following rates:
N package at 9.3mW/°C
D package at 6.2mW/°C
3. See “Power Dissipation Considerations” section.
338
August 31, 1994
Philips Semiconductors Linear Products
Product specification
General purpose CMOS timer
ICM7555
DC AND AC ELECTRICAL CHARACTERISTICS
°
T = 25 C unless otherwise specified.
A
LIMITS
ICM7555
TYP
SYMBOL
PARAMETER
TEST CONDITIONS
UNITS
MAX
MIN
V
DD
Supply voltage
T
MIN
< T < T
3
16
V
A
MAX
µA
µA
1
V
V
= V
50
180
200
300
DD
DD
MIN
I
Supply current
DD
= V
MAX
2
Astable mode timing
R , R = 1k to 100k, C = 0.1µF
A
B
5V <V <15V
DD
Initial accuracy
Drift with supply voltage
Drift with temperature
1.0
0.1
5.0
3.0
%
%/V
3
V
= 5V
= 10V
= 15V
DD
o
o
o
50
75
100
ppm/ C
ppm/ C
ppm/ C
V
DD
V
DD
V
Threshold voltage
Trigger voltage
V
= 5V
= 5V
0.63
0.29
0.65
0.31
0.67
0.34
xV
xV
TH
DD
DD
DD
V
TRIG
V
DD
V
V
V
= V
= V
MAX
= 5V
TRIG
= V
TRIG MIN
50
10
1
pA
pA
pA
DD
TRIG
= V
I
Trigger current
Threshold current
Reset current
DD
TRIG
= V
DD
V
V
V
50
10
1
pA
pA
pA
DD
TH
MAX
I
TH
DD
V
V
V
= V
= V
= V
= V
=
= V
100
20
2
pA
pA
pA
DD
DD
DD
RST
RST
RST
MAX
5V
MIN
I
RST
V
Reset voltage
Control voltage
V
DD
= V
and V
= 5V
0.4
0.7
1.0
V
RST
MIN
MAX
V
V
DD
0.62
0.65
0.67
xV
DD
CV
V
V
= V
= 5V,
, I
I
SINK
= 3.2mA
= 3.2mA
0.1
0.2
0.4
0.4
V
V
DD
DD
MAX SINK
V
OL
Output voltage (low)
V
V
= V
, I
I
= -1.0mA
= -1.0mA
15.25
4.0
15.7
4.5
V
V
DD
DD
MAX SOURCE
DD
DD
V
Output voltage (high)
OH
= 5V,
= 5V, I = 10.0mA
DIS
SOURCE
V
DIS
Discharge output voltage
V
DD
0.2
45
20
0.4
75
75
V
R = 10MΩ, C = 10pF, V
=
=
L
L
5V
DD
3
t
Rise time of output
ns
R
R = 10MΩ, C = 10pF, V
L
L
5V
DD
3
t
Fall time of output
ns
F
Maximum oscillator frequency
(astable mode)
F
MAX
500
kHz
NOTES:
1. The supply current value is essentially independent of the TRIGGER, THRESHOLD, and RESET voltages.
1.38
(R + 2R )C
2. Astable timing is calculated using the following equation: f =
3. Parameter is not 100% tested.
. The components are defined in Figure 2.
A
B
339
August 31, 1994
Philips Semiconductors Linear Products
Product specification
General purpose CMOS timer
ICM7555
TYPICAL PERFORMANCE CHARACTERISTICS
225
200
175
150
125
100
75
T
= –55°C
= +25°C
A
T
A
T
= +125°C
A
50
25
0
0
5
10
SUPPLY VOLTAGE (V
15
20
)
DD
Supply Current vs Supply Voltage
100.0
10.0
1.0
T
= +25°C
A
V
V
= 18V
= 5V
DD
DD
V
= 2V
DD
0.1
0.1
1.0
V
10.0
– V
OUT
(V)
DD
High Output Voltage Drop vs Output Source Current
340
August 31, 1994
Philips Semiconductors Linear Products
Product specification
General purpose CMOS timer
ICM7555
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
100.0
T
= 25°C
V
V
= 18V
= 5V
= 2V
A
DD
DD
10.0
1.0
V
DD
0.1
0.1
1.0
10.0
DISCHARGE VOLTAGE (V)
Discharge Low Output Voltage vs Discharge Sink Current
100.0
10.0
1.0
T
= +125°C
A
V
V
= 18V
= 5V
DD
DD
V
= 2V
DD
0.1
0.1
1.0
10.0
OUTPUT VOLTAGE (V)
Low Output Voltage vs Output Sink Current
341
August 31, 1994
Philips Semiconductors Linear Products
Product specification
General purpose CMOS timer
ICM7555
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
100.0
T
= 25°C
A
V
V
= 18V
DD
DD
10.0
1.0
= 5V
= 2V
V
DD
0.1
0.1
1.0
10.0
OUTPUT VOLTAGE (V)
Low Output Voltage vs Output Sink Current
100.0
10.0
1.0
V
V
= 18V
= 5V
T
= -55°C
DD
DD
A
V
= 2V
DD
0.1
0.1
1.0
OUTPUT VOLTAGE (V)
10.0
Low Output Voltage vs Output Sink Current
500
400
300
200
100
0
V
= 2V
V
DD
= 5V
10
DD
V
= 18V
DD
0
20
30
40
LOWEST LEVEL OF TRIGGER PULSE (%V
)
DD
Minimum Pulse Width for Triggering
342
August 31, 1994
Philips Semiconductors Linear Products
Product specification
General purpose CMOS timer
ICM7555
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
3
1.0
V
= 5V
DD
750.0
T
= +125°C
= +25°C
A
500.0
250.0
0.0
T
A
T
= –55°C
A
0
10
20
30
DD
40
LOWEST VOLTAGE OF TRIGGER PULSE (%V
)
Propagation Delay vs Voltage Level of Trigger Pulse
6
4
T
= +25°C
A
R
= R = 10kΩ
A
B
C = 0.1µF
2
0
–2
–4
0
5
10
15
20
SUPPLY VOLTAGE (V
)
DD
Normalized Frequency Stability as a Function of Supply Voltage (Astable Mode)
4
R
= R = 1kΩ
B
A
C = 0.1µF
2
0
V
= 18V
DD
V
V
= 5V
DD
DD
–2
–4
= 2V
–5.0E1
–2.5E1
0.0
25.0
50.0
75.0
100.0
125.0
TEMPERATURE (°C)
Normalized Frequency Stability as a Function of Temperature (Astable Mode)
343
August 31, 1994
Philips Semiconductors Linear Products
Product specification
General purpose CMOS timer
ICM7555
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
100.0
(R + 2R
A
)
B
V
T
= 5V
DD
= +25°C
10.0
1.0
A
1kΩ
0.1
10kΩ
0.01
0.001
0.0001
0.0
100kΩ
1MΩ
10MΩ
0.1
1.0
10
100
1k
10k
100k
1M
10M
FREQUENCY (Hz)
Free-Running Frequency as a Function of R , R , and C
A
B
100.0
10.0
1.0
V
T
= 5V
DD
= +25°C
A
1kΩ
R
A
0.1
10kΩ
0.01
0.001
0.0001
0.0
100kΩ
1MΩ
10MΩ
1µs
10µs
100µs
100ns
1ms
TIME DELAY
10ms
100ms
1s
10s
Monostable Time Delay vs R and C
A
bipolar 555 device produces large crowbar currents in the output
driver, it is necessary to decouple the power supply lines with a
good capacitor close to the device. The 7555 device produces no
such transients. See Figure 1.
500
400
300
200
100
0
T
= +25°C
A
The ICM7555 produces supply current spikes of only 2-3mA instead
of 300-400mA and supply decoupling is normally not necessary.
Secondly, in most instances, the CONTROL VOLTAGE decoupling
capacitors are not required since the input impedance of the CMOS
comparators on chip are very high. Thus, for many applications, 2
capacitors can be saved using an ICM7555.
NE/SE555
ICM7555
Power Supply Considerations
Although the supply current consumed by the ICM7555 device is
very low, the total system supply can be high unless the timing
components are high impedance. Therefore, high values for R and
low values for C in Figures 2 and 3 are recommended.
0
200
400
TIME (ns)
600
800
Figure 1. Supply Current Transient
Compared With a Standard Bipolar 555
During an Output Transition
Output Drive Capability
The output driver consists of a CMOS inverter capable of driving
most logic families including CMOS and TTL. As such, if driving
CMOS, the output swing at all supply voltages will equal the supply
voltage. At a supply voltage of 4.5V or more, the ICM7555 will drive
at least 2 standard TTL loads.
APPLICATION NOTES
General
The ICM7555 device is, in most instances, a direct replacement for
the NE/SE555 device. However, it is possible to effect economies in
the external component count using the ICM7555. Because the
344
August 31, 1994
Philips Semiconductors Linear Products
Product specification
General purpose CMOS timer
ICM7555
improved over the standard bipolar 555 in that it controls only the
internal flip-flop, which in turn controls simultaneously the state of
the OUTPUT and DISCHARGE pins. This avoids the multiple
threshold problems sometimes encountered with slow falling edges
in the bipolar devices.
Astable Operation
If the circuit is connected as shown in Figure 2, it will trigger itself
and free run as a multivibrator. The external capacitor charges
through R and R and discharges through R only. Thus, the duty
A
B
B
cycle (D) may be precisely set by the ratio of these two resistors. In
this mode of operation, the capacitor charges and discharges
V
DD
between 1/3 V and 2/3 V . Since the charge rate and the
DD
DD
V
threshold levels are directly proportional to the supply voltage, the
frequency of oscillation is independent of the supply voltage.
1
8
DD
GND
R
A
2
3
7
6
DISHCARGE
THRESHOLD
TRIGGER
OUTPUT
RESET
R
+ R
B
1.38
(R + 2R )
A
A
F =
D =
OUTPUT
C
B
R + 2R
A B
R
B
4
5
CONTROL
VOLTAGE
V
Monostable Operation
DD
In this mode of operation, the timer functions as a one-shot. Initially,
the external capacitor (C) is held discharged by a transistor inside
the timer. Upon application of a negative pulse to Pin 2,TRIGGER,
the internal flip-flop is set which releases the low impedance on
DISCHARGE; the external capacitor charges and drives the
OUTPUT High. The voltage across the capacitor increases
C
exponentially with a time constant t = R C. When the voltage
across the capacitor equals 2/3 V , the comparator resets the
A
Figure 2. Astable Operation
+
flip-flop, which in turn discharges the capacitor rapidly and also
drives the OUTPUT to its low state. TRIGGER must return to a high
state before the OUTPUT can return to a low state.
V
DD
R
A
1
8
7
Control Voltage
The CONTROL VOLTAGE terminal permits the two trip voltages for
the THRESHOLD and TRIGGER internal comparators to be
controlled. This provides the possibility of oscillation frequency
modulation in the astable mode, or even inhibition of oscillation,
depending on the applied voltage. In the monostable mode, delay
times can be changed by varying the applied voltage to the
CONTROL VOLTAGE pin.
2
3
DISHCARGE
THRESHOLD
TRIGGER
OUTPUT
RESET
6
5
4
CONTROL
VOLTAGE
OPTIONAL
CAPACITOR
C
V
DD
< 18V
RESET
The RESET terminal is designed to have essentially the same trip
voltage as the standard bipolar 555, i.e., 0.6 to 0.7V. At all supply
voltages it represents an extremely high input impedance. The
mode of operation of the RESET function is, however, much
t = 1.05 R
C
A
Figure 3. Monostable Operation
345
August 31, 1994
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