Philips Semiconductors Linear Products
Product specification
ICM7555
General purpose CMOS timer
337
August 31, 1994
853-1192 13721
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: 80
A (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
THRESHOLD
D and N Packages
DISCHARGE
VDD
CONTROL VOLTAGE
1
2
3
4
5
6
7
8
GND
TRIGGER
OUTPUT
RESET
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
DESCRIPTION
TEMPERATURE RANGE
ORDER CODE
DWG #
8-Pin Plastic Dual In-Line Package (DIP)
0 to +70
C
ICM7555CN
0404B
8-Pin Plastic Small Outline (SO) Package
0 to +70
C
ICM7555CD
0174C
8-Pin Plastic Dual In-Line Package (DIP)
-40 to +85
C
ICM7555IN
0404B
8-Pin Plastic Small Outline (SO) Package
-40 to +85
C
ICM7555ID
0174C
Philips Semiconductors Linear Products
Product specification
ICM7555
General purpose CMOS timer
August 31, 1994
338
EQUIVALENT BLOCK DIAGRAM
NOTE:
UNUSED INPUTS SHOULD BE CONNECTED TO APPROPRIATE VOLTAGE FROM TRUTH TABLE.
V
DD
8
R
6
5
2
R
1
R
COMPARATOR
A
COMPARATOR
B
FLIPFLOP
RESET
4
OUTPUT
DRIVERS
3
OUTPUT
DISCHARGE
7
N
1
+
+
THRESHOLD
CONTROL
VOLTAGE
TRIGGER
TRUTH TABLE
THRESHOLD VOLTAGE
TRIGGER VOLTAGE
RESET
1
OUTPUT
DISCHARGE SWITCH
DON'T CARE
DON'T CARE
LOW
LOW
ON
>2/3(V+)
> 1/3(V+)
HIGH
LOW
ON
V
TH
< 2/3
V
TR
> 1/3
HIGH
STABLE
STABLE
DON'T CARE
<1/3(V+)
HIGH
HIGH
OFF
NOTES:
1. RESET will dominate all other inputs: TRIGGER will dominate over THRESHOLD.
ABSOLUTE MAXIMUM RATINGS
1
SYMBOL
PARAMETER
RATING
UNITS
V
DD
Supply voltage
+18
V
V
TRIG
1
Trigger input voltage
V
CV
Control voltage
> -0.3 to
V
TH
Threshold input voltage
<V
DD
+ 0.3
V
V
RST
RESET input voltage
I
OUT
Output current
100
mA
P
DMAX
Maximum power dissipation, T
A
= 25
C (still air)
2
N package
1160
mW
D package
780
mW
T
STG
Storage temperature range
-65 to +150
C
T
SOLD
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
V
DD
+ 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.
Philips Semiconductors Linear Products
Product specification
ICM7555
General purpose CMOS timer
August 31, 1994
339
DC AND AC ELECTRICAL CHARACTERISTICS
T
A
= 25
C unless otherwise specified.
SYMBOL
PARAMETER
TEST CONDITIONS
LIMITS
UNITS
SYMBOL
PARAMETER
TEST CONDITIONS
ICM7555
UNITS
MIN
TYP
MAX
V
DD
Supply voltage
T
MIN
< T
A
< T
MAX
3
16
V
I
DD
Supply current
1
V
DD
= V
MIN
V
DD
= V
MAX
50
180
200
300
A
A
Astable mode timing
2
Initial accuracy
Drift with supply voltage
Drift with temperature
3
R
A
, R
B
= 1k to 100k, C = 0.1
F
5
V <V
DD
<15V
V
DD
= 5V
V
DD
= 10V
V
DD
= 15V
1.0
0.1
50
75
100
5.0
3.0
%
%/V
ppm/
o
C
ppm/
o
C
ppm/
o
C
V
TH
Threshold voltage
V
DD
= 5V
0.63
0.65
0.67
xV
DD
V
TRIG
Trigger voltage
V
DD
= 5V
0.29
0.31
0.34
xV
DD
I
TRIG
Trigger current
V
DD
= V
TRIG
= V
MAX
V
DD
= V
TRIG
= 5V
V
DD
= V
TRIG
= V
MIN
50
10
1
pA
pA
pA
I
TH
Threshold current
V
DD
= V
TH
= V
MAX
V
DD
= V
TH
= 5V
V
DD
= V
TH
= V
MIN
50
10
1
pA
pA
pA
I
RST
Reset current
V
DD
= V
RST
= V
MAX
V
DD
= V
RST
= 5V
V
DD
= V
RST
= V
MIN
100
20
2
pA
pA
pA
V
RST
Reset voltage
V
DD
= V
MIN
and V
MAX
0.4
0.7
1.0
V
V
CV
Control voltage
V
DD
= 5V
0.62
0.65
0.67
xV
DD
V
OL
Output voltage (low)
V
DD
= V
MAX
, I
SINK
= 3.2mA
V
DD
= 5V, I
SINK
= 3.2mA
0.1
0.2
0.4
0.4
V
V
V
OH
Output voltage (high)
V
DD
= V
MAX
, I
SOURCE
= -1.0mA
V
DD
= 5V, I
SOURCE
= -1.0mA
15.25
4.0
15.7
4.5
V
DD
V
DD
V
DIS
Discharge output voltage
V
DD
= 5V, I
DIS
= 10.0mA
0.2
0.4
V
t
R
Rise time of output
3
R
L
= 10M
, C
L
= 10pF, V
DD
=
5V
45
75
ns
t
F
Fall time of output
3
R
L
= 10M
, C
L
= 10pF, V
DD
=
5V
20
75
ns
F
MAX
Maximum oscillator frequency
(astable mode)
500
kHz
NOTES:
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 =
1.38
(R
A
+ 2R
B
)C
. The components are defined in Figure 2.
3. Parameter is not 100% tested.
Philips Semiconductors Linear Products
Product specification
ICM7555
General purpose CMOS timer
August 31, 1994
340
TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current vs Supply Voltage
High Output Voltage Drop vs Output Source Current
225
200
175
150
125
100
75
50
25
0
0
5
10
15
20
SUPPLY VOLTAGE (VDD)
SUPPL
Y
CURRENT (I ) (
A)
DD
TA = +25
C
TA = +125
C
TA = 55
C
VDD = 18V
VDD = 5V
VDD = 2V
TA = +25
C
100.0
10.0
1.0
0.1
0.1
1.0
10.0
OUTPUT SOURCE CURRENT 9mA)
VDD VOUT (V)
Philips Semiconductors Linear Products
Product specification
ICM7555
General purpose CMOS timer
August 31, 1994
341
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
100.0
10.0
1.0
0.1
0.1
1.0
10.0
DISCHARGE VOLTAGE (V)
DISCHARGE CURRENT (mA)
TA = 25
C
VDD = 18V
VDD = 5V
VDD = 2V
VDD = 18V
VDD = 5V
VDD = 2V
TA = +125
C
100.0
10.0
1.0
0.1
0.1
1.0
10.0
OUTPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
Discharge Low Output Voltage vs Discharge Sink Current
Low Output Voltage vs Output Sink Current
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