Philips icm7555, icm7555i, icm7555c DATASHEETS

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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

 

 

 

8

VDD

 

 

 

 

 

 

 

 

 

 

 

 

TRIGGER

 

 

2

 

 

 

7

DISCHARGE

 

OUTPUT

 

 

 

 

 

 

 

3

 

 

 

6

THRESHOLD

 

 

 

 

 

 

 

 

 

 

 

 

 

RESET

 

4

 

 

 

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

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

ORDERING INFORMATION

APPLICATIONS

Precision timing

Pulse generation

Sequential timing

Time delay generation

Pulse width modulation

Pulse position modulation

Missing pulse detector

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

August 31, 1994

337

853-1192 13721

Philips icm7555, icm7555i, icm7555c DATASHEETS

Philips Semiconductors Linear Products

Product specification

 

 

 

General purpose CMOS timer

ICM7555

 

 

 

EQUIVALENT BLOCK DIAGRAM

 

VDD

FLIP±FLOP

 

 

 

RESET

 

 

 

8

4

 

 

 

R

 

 

 

 

 

COMPARATOR

OUTPUT

 

 

6

A

 

THRESHOLD

DRIVERS

 

 

+

 

 

3

 

 

 

OUTPUT

 

 

 

CONTROL 5

±

 

 

 

VOLTAGE

 

 

 

 

 

R

 

DISCHARGE

 

 

COMPARATOR

 

 

 

 

7

 

 

 

 

 

 

 

+

 

 

 

2

±

N

 

TRIGGER

 

 

 

 

 

 

 

R

 

1

 

 

 

 

 

 

1

 

 

 

NOTE:

 

 

 

 

UNUSED INPUTS SHOULD BE CONNECTED TO APPROPRIATE VOLTAGE FROM TRUTH TABLE.

 

 

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

 

 

 

 

 

 

 

VTH < 2/3

 

VTR > 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 RATINGS1

SYMBOL

 

 

 

PARAMETER

 

RATING

UNITS

 

 

 

 

 

 

 

 

VDD

 

Supply voltage

 

+18

V

VTRIG1

 

 

 

input voltage

 

 

 

 

Trigger

 

 

 

VCV

 

Control voltage

 

> -0.3 to

 

VTH

 

Threshold input voltage

 

<VDD + 0.3

V

VRST

 

 

input voltage

 

 

 

 

RESET

 

 

 

IOUT

 

Output current

 

100

mA

P

°

2

 

 

DMAX

 

Maximum power dissipation, TA = 25 C (still air)

 

 

 

 

 

 

N package

 

1160

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 ªPower Dissipation Considerationsº section.

August 31, 1994

338

August 31, 1994
339
3. Parameter is not 100% tested.
2. Astable timing is calculated using the following equation: f =
. The components are defined in Figure 2.
NOTES:
1. The supply current value is essentially independent of the TRIGGER, THRESHOLD, and RESET voltages. 1.38
(RA + 2RB)C

Philips Semiconductors Linear Products

Product specification

 

 

 

General purpose CMOS timer

ICM7555

 

 

 

DC AND AC ELECTRICAL CHARACTERISTICS

TA = 25°C unless otherwise specified.

 

 

 

 

 

 

 

 

 

 

 

LIMITS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SYMBOL

PARAMETER

 

TEST CONDITIONS

 

 

 

ICM7555

 

UNITS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MIN

TYP

MAX

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VDD

Supply voltage

 

TMIN < TA < TMAX

3

 

 

16

V

IDD

Supply current1

 

 

 

VDD = VMIN

 

 

 

50

200

μA

 

 

 

 

 

 

μA

 

 

 

 

 

VDD = VMAX

 

 

 

180

300

 

Astable mode timing2

 

 

 

 

 

μ

 

 

 

 

 

 

 

 

RA, RB = 1k to 100k, C = 0.1 F

 

 

 

 

 

 

 

 

 

 

5V <VDD <15V

 

 

 

 

 

 

 

Initial accuracy

 

 

 

 

 

 

 

 

 

1.0

5.0

%

 

Drift with supply voltage

 

 

 

 

 

 

 

 

 

0.1

3.0

%/V

 

Drift with temperature3

 

 

 

VDD = 5V

 

 

 

50

 

ppm/oC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VDD = 10V

 

 

 

75

 

ppm/oC

 

 

 

 

 

VDD = 15V

 

 

 

100

 

ppm/oC

VTH

Threshold voltage

 

 

 

VDD = 5V

0.63

0.65

0.67

xVDD

VTRIG

Trigger voltage

 

 

 

VDD = 5V

0.29

0.31

0.34

xVDD

 

 

 

VDD = VTRIG = VMAX

 

 

 

50

 

pA

ITRIG

Trigger current

 

VDD = VTRIG = 5V

 

 

 

10

 

pA

 

 

 

VDD = VTRIG = VMIN

 

 

 

1

 

pA

 

 

 

VDD = VTH = VMAX

 

 

 

50

 

pA

ITH

Threshold current

 

 

VDD = VTH = 5V

 

 

 

10

 

pA

 

 

 

VDD = VTH = VMIN

 

 

 

1

 

pA

 

 

 

VDD = VRST = VMAX

 

 

 

100

 

pA

IRST

Reset current

 

VDD = VRST = 5V

 

 

 

20

 

pA

 

 

 

VDD = VRST = VMIN

 

 

 

2

 

pA

VRST

Reset voltage

 

VDD = VMIN and VMAX

0.4

 

0.7

1.0

V

VCV

Control voltage

 

 

 

VDD = 5V

0.62

0.65

0.67

xVDD

VOL

Output voltage (low)

VDD = VMAX, ISINK = 3.2mA

 

 

 

0.1

0.4

V

VDD = 5V, ISINK = 3.2mA

 

 

 

0.2

0.4

V

 

 

 

 

 

VOH

Output voltage (high)

VDD = VMAX, ISOURCE = -1.0mA

15.25

15.7

 

VDD

VDD = 5V,

ISOURCE = -1.0mA

4.0

 

4.5

 

VDD

 

 

 

 

VDIS

Discharge output voltage

VDD = 5V, IDIS = 10.0mA

 

 

 

0.2

0.4

V

 

Rise time of output3

RL = 10MΩ, CL = 10pF, VDD =

 

 

 

 

 

 

t

 

 

 

 

5V

 

 

 

45

75

ns

R

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Fall time of output3

RL = 10MΩ, CL = 10pF, VDD =

 

 

 

 

 

 

t

 

 

 

 

5V

 

 

 

20

75

ns

F

 

 

 

 

 

 

 

 

 

 

 

 

 

FMAX

Maximum oscillator frequency

 

 

 

 

 

 

500

 

 

 

kHz

(astable mode)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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