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PDF ICM7555 Data sheet ( Hoja de datos )
| Número de pieza | ICM7555 | |
| Descripción | General purpose CMOS timer | |
| Fabricantes | NXP Semiconductors | |
| Logotipo |  |
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ICM7555
General purpose CMOS timer
Rev. 02 — 3 August 2009
Product data sheet
1. General description
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.
The ICM7555 is a stable controller capable of producing accurate time delays or
frequencies.
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 NE/SE555 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.
2. Features
I Exact equivalent in most applications for NE/SE555
I Low supply current: 80 µA (typical)
I Extremely low trigger, threshold, and reset currents: 20 pA (typical)
I High-speed operation: 500 kHz guaranteed
I Wide operating supply voltage range guaranteed 3 V to 16 V over full automotive
temperatures
I Normal reset function; no crowbarring of supply during output transition
I Can be used with higher-impedance timing elements than the NE/SE555 for longer
time constants
I Timing from microseconds through hours
I Operates in both astable and monostable modes
I Adjustable duty cycle
I High output source/sink driver can drive TTL/CMOS
I Typical temperature stability of 0.005 % / °C at 25 °C
I Rail-to-rail outputs
1 page  
NXP Semiconductors
ICM7555
General purpose CMOS timer
Table 5. Characteristics …continued
Tamb = 25 °C unless otherwise specified.
Sym Parameter
bol
Conditions
II input current
TRIGGER
VDD = Vtrig = Vmax
VDD = Vtrig = 5 V
VDD = Vtrig = Vmin
THRESHOLD
VDD = Vth = Vmax
VDD = Vth = 5 V
VDD = Vth = Vmin
RESET
VOL LOW-level output voltage
VOH HIGH-level output voltage
Vo output voltage
tr(o) output rise time[4]
tf(o) output fall time[4]
fosc oscillator frequency
VDD = Vrst = Vmax
VDD = Vrst = 5 V
VDD = Vrst = Vmin
VDD = Vmax; Isink = 3.2 mA
VDD = 5 V; Isink = 3.2 mA
Isource = −1.0 mA
VDD = Vmax
VDD = 5 Vmax
DISCHARGE:
VDD = 5 V; IDIS = 10 mA
RL = 10 MΩ; CL = 10 pF;
VDD = 5 V
astable mode
Min Typ
- 50
- 10
-1
- 50
- 10
-1
- 100
- 20
-2
- 0.1
- 0.2
15.25
4.0
-
-
-
-
15.7
4.5
0.2
45
20
-
[1] The supply current value is essentially independent of the TRIGGER, THRESHOLD and RESET voltages.
[2] Astable timing is calculated using the following equation:
f = (---R----A----+-1---.-32---8-R----B---)--C---
The components are defined in Figure 15.
[3] RA, RB = 1 kΩ to 100 kΩ; C = 0.1 µF; 5 V < VDD < 15 V
[4] Parameter is not 100 % tested.
Max
-
-
-
-
-
-
-
-
-
0.4
0.4
-
-
0.4
75
75
500
Unit
pA
pA
pA
pA
pA
pA
pA
pA
pA
V
V
V
V
V
ns
ns
kHz
ICM7555_2
Product data sheet
Rev. 02 — 3 August 2009
© NXP B.V. 2009. All rights reserved.
5 of 22
5 Page 
NXP Semiconductors
ICM7555
General purpose CMOS timer
11. Application information
11.1 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 NE/SE555 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 ICM7555 device produces no such transients. See Figure 14.
The ICM7555 produces supply current spikes of only 2 mA to 3 mA instead of
300 mA to 400 mA 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.
500
IDD
(mA)
300
002aae417
(1)
100
(2)
−100
0
200 400 600 800
time (ns)
Tamb = +25 °C
(1) NE/SE555
(2) ICM7555
Fig 14. Supply current transient compared with a standard NE/SE555 device during an
output transition
11.2 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 Figure 15 and Figure 16 are recommended.
11.3 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 4.5 V or more, the ICM7555
will drive at least 2 standard TTL loads.
ICM7555_2
Product data sheet
Rev. 02 — 3 August 2009
© NXP B.V. 2009. All rights reserved.
11 of 22
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| PDF Descargar | [ Datasheet ICM7555.PDF ] | |
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