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NXP Semiconductors Electronic Components Datasheet

7555CN Datasheet

General purpose CMOS timer

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Philips Semiconductors Linear Products
Product specification
General purpose CMOS timer
ICM7555
www.DataSheet4U.com
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
D and N Packages
GND 1
TRIGGER 2
OUTPUT 3
RESET 4
8 VDD
7 DISCHARGE
6 THRESHOLD
5 CONTROL VOLTAGE
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%/oC 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
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
0 to +70°C
-40 to +85°C
-40 to +85°C
ORDER CODE
ICM7555CN
ICM7555CD
ICM7555IN
ICM7555ID
DWG #
0404B
0174C
0404B
0174C
August 31, 1994
337 853-1192 13721


NXP Semiconductors Electronic Components Datasheet

7555CN Datasheet

General purpose CMOS timer

No Preview Available !

Philips Semiconductors Linear Products
General purpose CMOS timer
Product specification
ICM7555
www.DataSheet4U.com
EQUIVALENT BLOCK DIAGRAM
VDD
8
FLIP–FLOP
RESET
4
THRESHOLD 6
CONTROL 5
VOLTAGE
2
TRIGGER
R
COMPARATOR
A
+
R
COMPARATOR
B
+
R
1
NOTE:
UNUSED INPUTS SHOULD BE CONNECTED TO APPROPRIATE VOLTAGE FROM TRUTH TABLE.
TRUTH TABLE
THRESHOLD VOLTAGE
TRIGGER VOLTAGE
RESET1
DON’T CARE
DON’T CARE
LOW
>2/3(V+)
> 1/3(V+)
HIGH
VTH < 2/3
DON’T CARE
VTR > 1/3
<1/3(V+)
HIGH
HIGH
NOTES:
1. RESET will dominate all other inputs: TRIGGER will dominate over THRESHOLD.
OUTPUT
DRIVERS
3 OUTPUT
DISCHARGE
7
N
1
OUTPUT
LOW
LOW
STABLE
HIGH
DISCHARGE SWITCH
ON
ON
STABLE
OFF
ABSOLUTE MAXIMUM RATINGS1
SYMBOL
PARAMETER
RATING
UNITS
VDD
VTRIG1
VCV
VTH
VRST
IOUT
PDMAX
Supply voltage
Trigger input voltage
Control voltage
Threshold input voltage
RESET input voltage
Output current
Maximum power dissipation, TA = 25°C (still air)2
N package
+18
> -0.3 to
<VDD + 0.3
100
1160
V
V
mA
mW
D package
780 mW
TSTG
Storage temperature range
-65 to +150
°C
TSOLD
Lead temperature (Soldering 60s)
300 °C
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
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.
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.
August 31, 1994
338


Part Number 7555CN
Description General purpose CMOS timer
Maker NXP Semiconductors
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7555CN Datasheet PDF






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