Philips Semiconductors Linear Products
Product specification
General purpose CMOS timer
ICM7555
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.
PIN CONFIGURATION
D and N Packages
GND
1
TRIGGER
OUTPUT
2
3
8
7
6
5
V
DD
DISCHARGE
THRESHOLD
CONTROL VOLTAGE
RESET
4
鈥?/div>
Timing from microseconds through hours
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Operates in both astable and monostable modes
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Adjustable duty cycle
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High output source/sink driver can drive TTL/CMOS
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Typical temperature stability of 0.005%/
o
C at 25
掳
C
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Rail-to-rail outputs
APPLICATIONS
FEATURES
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Exact equivalent in most applications for NE/SE555
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Low supply current: 80碌A (typ)
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Extremely low trigger, threshold, and reset currents: 20pA (typ)
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High-speed operation: 500kHz guaranteed
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Wide operating supply voltage range guaranteed 3 to 16V over full
automotive temperatures
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Normal reset function; no crowbarring of supply during output
transition
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Precision timing
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Pulse generation
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Sequential timing
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Time delay generation
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Pulse width modulation
鈥?/div>
Pulse position modulation
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Missing pulse detector
鈥?/div>
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掳C
0 to +70掳C
-40 to +85掳C
-40 to +85掳C
ORDER CODE
ICM7555CN
ICM7555CD
ICM7555IN
ICM7555ID
DWG #
0404B
0174C
0404B
0174C
August 31, 1994
337
853-1192 13721
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