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ICM7555CDPHILIPSN/a1363avaiGeneral purpose CMOS timer
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ICM7555CD-ICM7555CN-ICM7555ID-ICM7555IN
General purpose CMOS timer
Philips Semiconductors Linear Products Product specification
ICM7555General purpose CMOS timer
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 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.
FEATURES
Exact equivalent in most applications for NE/SE555 Low supply current: 80μA (typ) Extremely low trigger, threshold, and reset currents: 20pA (typ) High-speed operation: 500kHz guaranteed 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
PIN CONFIGURATION
Timing from microseconds through hours Operates in both astable and monostable modes Adjustable duty cycle High output source/sink driver can drive TTL/CMOS Typical temperature stability of 0.005%/o C at 25°C Rail-to-rail outputs
APPLICATIONS
Precision timing Pulse generation Sequential timing Time delay generation Pulse width modulation Pulse position modulation Missing pulse detector
ORDERING INFORMATION
Philips Semiconductors Linear Products Product specification
ICM7555General purpose CMOS timer
EQUIVALENT BLOCK DIAGRAM
TRUTH TABLE
NOTES:
RESET will dominate all other inputs: TRIGGER will dominate over THRESHOLD.
ABSOLUTE MAXIMUM RATINGS1
NOTES:
Due to the SCR structure inherent in the CMOS process used to fabricate these devices, connecting any terminal to a voltage greater than
VDD + 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
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. Derate above 25°C, at the following rates:
N package at 9.3mW/°C
D package at 6.2mW/°C
Philips Semiconductors Linear Products Product specification
ICM7555General purpose CMOS timer
DC AND AC ELECTRICAL CHARACTERISTICS

TA = 25° C unless otherwise specified.
NOTES:
The supply current value is essentially independent of the TRIGGER, THRESHOLD, and RESET voltages. Astable timing is calculated using the following equation: f = 1.38
(RA + 2RB)C . The components are defined in Figure 2. Parameter is not 100% tested.
Philips Semiconductors Linear Products Product specification
ICM7555General purpose CMOS timer
TYPICAL PERFORMANCE CHARACTERISTICS
Philips Semiconductors Linear Products Product specification
ICM7555General purpose CMOS timer
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Philips Semiconductors Linear Products Product specification
ICM7555General purpose CMOS timer
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
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