Philips icm7555, icm7555i, icm7555c DATASHEETS

Philips Semiconductors Linear Products Product specification

ICM7555General 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: 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

THRESHOLD

D and N Packages

DISCHARGE

CONTROL VOLTAGE

4 5

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%/

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

ICM7555General purpose CMOS timer

August 31, 1994

338

EQUIVALENT BLOCK DIAGRAM

NOTE:

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

COMPARATOR

FLIP–FLOP

RESET

OUTPUT DRIVERS

OUTPUT

DISCHARGE

–

THRESHOLD

CONTROL VOLTAGE

TRIGGER

TRUTH TABLE

THRESHOLD VOLTAGE TRIGGER VOLTAGE RESET

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 RATINGS

SYMBOL

PARAMETER RATING UNITS

Supply voltage +18 V

TRIG

Trigger input voltage

Control voltage > -0.3 to

Threshold input voltage <VDD + 0.3 V

RST

RESET input voltage

OUT

Output current 100 mA

DMAX

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

N package 1160 mW D package 780 mW

STG

Storage temperature range -65 to +150

°C

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

+ 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

ICM7555General purpose CMOS timer

August 31, 1994

339

DC AND AC ELECTRICAL CHARACTERISTICS

TA = 25°C unless otherwise specified.

LIMITS

SYMBOL

PARAMETER

TEST CONDITIONS

ICM7555

UNITS

MIN TYP MAX

Supply voltage T

MIN

< TA < T

MAX

3 16 V

Supply current

1 V

= V

MIN

VDD = V

MAX

180

200 300

µA µA

Astable mode timing

Initial accuracy Drift with supply voltage Drift with temperature

RA, RB = 1k to 100k, C = 0.1µF

5V <V

<15V

= 5V

= 10V

= 15V

1.0

0.1 50

100

5.0

3.0

%/V

ppm/

Threshold voltage VDD = 5V 0.63 0.65 0.67 xV

TRIG

Trigger voltage VDD = 5V 0.29 0.31 0.34 xV

TRIG

Trigger current

VDD = V

TRIG

= V

MAX

VDD = V

TRIG

= 5V

= V

TRIG

= V

MIN

50 10

pA pA pA

Threshold current

VDD = VTH = V

MAX

VDD = VTH = 5V

VDD = VTH = V

MIN

50 10

pA pA pA

RST

Reset current

VDD = V

RST

= V

MAX

VDD = V

RST

= 5V

= V

RST

= V

MIN

100

pA pA pA

RST

Reset voltage VDD = V

MIN

and V

MAX

0.4 0.7 1.0 V

Control voltage VDD = 5V 0.62 0.65 0.67 xV

Output voltage (low)

VDD = V

MAX

, I

SINK

= 3.2mA

= 5V, I

SINK

= 3.2mA

0.1

0.2

0.4

V V

Output voltage (high)

VDD = V

MAX

, I

SOURCE

= -1.0mA

= 5V, I

SOURCE

= -1.0mA

15.25

4.0

15.7

4.5

DIS

Discharge output voltage VDD = 5V, I

DIS

= 10.0mA 0.2 0.4 V

Rise time of output

RL = 10MΩ, CL = 10pF, VDD =

45 75 ns

Fall time of output

RL = 10MΩ, CL = 10pF, VDD =

20 75 ns

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

(RA + 2RB)C

. The components are defined in Figure 2.

3. Parameter is not 100% tested.

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