ICM7555CD NXP Semiconductors, ICM7555CD Datasheet - Page 11

• Manufacturer Part Number: ICM7555CD
• Manufacturer: NXP Semiconductors
• Type: Standardr

Specifications of ICM7555CD

• # Internal Timers: 1
• Power Dissipation: 780mW
• Operating Supply Voltage (min): 3V
• Operating Supply Voltage (typ): 3.3/5/9/12/15V
• Operating Supply Voltage (max): 16V
• Package Type: SO
• High Level Output Current: -1mA
• Low Level Output Current: 3.2mA
• Pin Count: 8
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Compliant

NXP Semiconductors
11. Application information
ICM7555_2
Product data sheet
11.1 General
11.2 Power supply considerations
11.3 Output drive capability
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
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.
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
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.
Fig 14. Supply current transient compared with a standard NE/SE555 device during an
(1) NE/SE555
(2) ICM7555
T
output transition
amb
= +25 C
(mA)
I
DD
Rev. 02 — 3 August 2009
500
300
100
100
0
200
(2)
Figure 15
(1)
400
and
600
time (ns)
Figure 16
002aae417
General purpose CMOS timer
800
are recommended.
Figure
© NXP B.V. 2009. All rights reserved.
ICM7555
14.
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