Datasheet

ManualsBrandsFAIRCHILD SEMICONDUCTOR ManualsLinear ICsN/A Case type SO8 Type (misc.) Timer Case type SO8 Type (misc.) Timer

FN2867.6

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

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ICM7555, ICM7556

General Purpose Timers

The ICM7555 and ICM7556 are CMOS RC timers providing

significantly improved performance over the standard

SE/NE555/6 and 355 timers, while at the same time being

direct replacements 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.

Specifically, the ICM7555 and ICM7556 are stable

controllers capable of producing accurate time delays or

frequencies. The ICM7556 is a dual ICM7555, with the two

timers operating independently of each other, sharing only

V+ and GND. 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 regular bipolar 555/6 devices, the CONTROL VOLTAGE

terminal need not be decoupled with a capacitor. The circuits

are triggered and reset on falling (negative) waveforms, and

the output inverter can source or sink currents large enough

to drive TTL loads, or provide minimal offsets to drive CMOS

loads.

Applications

• Precision Timing

• Pulse Generation

• Sequential Timing

• Time Delay Generation

• Pulse Width Modulation

• Pulse Position Modulation

• Missing Pulse Detector

Features

• Exact Equivalent in Most Cases for SE/NE555/556 or

TLC555/556

• Low Supply Current

- ICM7555. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60µA

- ICM7556. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120µA

• Extremely Low Input Currents . . . . . . . . . . . . . . . . . 20pA

• High Speed Operation . . . . . . . . . . . . . . . . . . . . . . . 1MHz

• Guaranteed Supply Voltage Range . . . . . . . . . 2V to 18V

• Temperature Stability . . . . . . . . . . . . 0.005%/

C at 25

• Normal Reset Function - No Crowbarring of Supply During

Output Transition

• Can be Used with Higher Impedance Timing Elements

than Regular 555/6 for Longer RC Time Constants

• Timing from Microseconds through Hours

• Operates in Both Astable and Monostable Modes

• Adjustable Duty Cycle

• High Output Source/Sink Driver can Drive TTL/CMOS

• Outputs have Very Low Offsets, HI and LO

Pinouts

Ordering Information

PART NUMBER

TEMP.

RANGE(

C) PACKAGE PKG. NO.

ICM7555CBA (7555CBA) 0 to 70 8 Ld SOIC M8.15

ICM7555IBA (7555IBA) -25 to 85 8 Ld SOIC M8.15

ICM7555IPA -25 to 85 8 Ld PDIP E8.3

ICM7556IPD -25 to 85 14 Ld PDIP E14.3

ICM7556MJD -55 to 125 14 Ld CERDIP F14.3

ICM7555 (PDIP, SOIC)

TOP VIEW

ICM7556 (PDIP, CERDIP)

TOP VIEW

GND

TRIGGER

OUTPUT

RESET

DISCHARGE

THRESHOLD

CONTROL

VOLTAGE

DISCHARGE

THRESH-

CONTROL

RESET

OUTPUT

TRIGGER

GND

DISCHARGE

THRESHOLD

CONTROL

RESET

OUTPUT

TRIGGER

VOLTAGE

OLD

Data Sheet November 2002

Summary of content (11 pages)

PAGE 1
ICM7555, ICM7556 ® Data Sheet November 2002 FN2867.6 General Purpose Timers Features The ICM7555 and ICM7556 are CMOS RC timers providing significantly improved performance over the standard SE/NE555/6 and 355 timers, while at the same time being direct replacements for those devices in most applications.
PAGE 2
ICM7555, ICM7556 Absolute Maximum Ratings Thermal Information Supply Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+18V Input Voltage Trigger, Control Voltage, Threshold, Reset (Note 1) . . . . . . . . . . . . . . . . . . . . . V+ +0.3V to GND -0.3V Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100mA Thermal Resistance (Typical, Note 2) θJA (oC/W) θJC (oC/W) 14 Lead CERDIP Package . . . . . . . . . 80 24 14 Lead PDIP Package . .
PAGE 3
ICM7555, ICM7556 Electrical Specifications Applies to ICM7555 and ICM7556, Unless Otherwise Specified (NOTE 4) -55oC TO 125oC TA = 25oC PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX MIN TYP MAX UNITS Reset Current IRST VDD = 15V - - 10 - - 50 nA Discharge Leakage IDIS VDD = 15V - - 10 - - 50 nA Output Voltage VOL VDD = 15V, ISINK = 20mA - 0.4 1.0 - - 1.25 V VDD = 5V, ISINK = 3.2mA - 0.2 0.4 - - 0.5 V VDD = 15V, ISOURCE = 0.8mA 14.3 14.6 - 14.
PAGE 4
ICM7555, ICM7556 Schematic Diagram VDD P P P R P THRESHOLD N N NPN CONTROL VOLTAGE R OUTPUT P P TRIGGER R N N N N N N RESET N GND DISCHARGE R = 100kΩ ±20% (TYP) Application Information General The ICM7555/6 devices are, in most instances, direct replacements for the NE/SE 555/6 devices. However, it is possible to effect economies in the external component count using the ICM7555/6.
PAGE 5
ICM7555, ICM7556 VDD 1 8 2 7 3 6 RA tOUTPUT = -ln (1/3) RAC = 1.1RAC VDD RA OUTPUT 4 VDD 5 1 TRIGGER RB OUTPUT 3 6 RESET 4 5 The circuit can be connected to trigger itself and free run as a multivibrator, see Figure 2A. The output swings from rail to rail, and is a true 50% duty cycle square wave. (Trip points and output swings are symmetrical). Less than a 1% frequency variation is observed, over a voltage range of +5V to +15V. 1 f = -----------------1.
PAGE 6
ICM7555, ICM7556 1200 MINIMUM PULSE WIDTH (ns) SUPPLY CURRENT (ICM7555) (µA) TA = 25oC 1100 1000 900 800 700 600 500 VDD = 2V 400 300 200 VDD = 5V 100 VDD = 18V 0 200 400 180 360 160 320 140 280 TA = -20oC 120 100 160 TA = 70oC 60 10 20 30 80 20 40 0 0 40 2 4 8 10 12 14 16 18 20 FIGURE 5. SUPPLY CURRENT vs SUPPLY VOLTAGE -0.1 100 TA = 25oC TA = -20oC OUTPUT SINK CURRENT (mA) OUTPUT SOURCE CURRENT (mA) 6 SUPPLY VOLTAGE (V) FIGURE 4.
PAGE 7
ICM7555, ICM7556 (Continued) 8 100 TA = 25oC 6 DISCHARGE SINK CURRENT (mA) NORMALIZED FREQUENCY DEVIATION (%) Typical Performance Curves 4 2 RA = RB = 10MΩ C = 100pF 0 2 RA = RB = 10kΩ C = 0.1µF 4 6 8 0.1 1.0 10.0 SUPPLY VOLTAGE (V) NORMALIZED FREQUENCY DEVIATION (%) PROPAGATION DELAY (ns) VDD = 5V 500 400 300 TA = 70oC TA = 25oC TA = -20oC 100 0 0 10 20 10.0 VDD = 2V 1.0 0.1 1.0 DISCHARGE LOW VOLTAGE (V) 30 40 +1.0 RA = RB = 10kΩ C = 0.1µF +0.9 +0.8 +0.7 +0.6 VDD = 5V +0.5 +0.
PAGE 8
ICM7555, ICM7556 Small Outline Plastic Packages (SOIC) M8.15 (JEDEC MS-012-AA ISSUE C) N INDEX AREA 0.25(0.010) M H 8 LEAD NARROW BODY SMALL OUTLINE PLASTIC PACKAGE B M E INCHES -B- 1 2 SYMBOL 3 L SEATING PLANE -A- h x 45o A D -C- e µα A1 B 0.25(0.010) M C C A M B S 1. Symbols are defined in the “MO Series Symbol List” in Section 2.2 of Publication Number 95. 2. Dimensioning and tolerancing per ANSI Y14.5M-1982. 3. Dimension “D” does not include mold flash, protrusions or gate burrs.
PAGE 9
ICM7555, ICM7556 Dual-In-Line Plastic Packages (PDIP) E8.3 (JEDEC MS-001-BA ISSUE D) N 8 LEAD DUAL-IN-LINE PLASTIC PACKAGE E1 INDEX AREA 1 2 3 INCHES N/2 -B- -AD E BASE PLANE -C- A2 SEATING PLANE A L D1 e B1 D1 A1 eC B 0.010 (0.25) M C A B S MILLIMETERS SYMBOL MIN MAX MIN MAX NOTES A - 0.210 - 5.33 4 A1 0.015 - 0.39 - 4 A2 0.115 0.195 2.93 4.95 - B 0.014 0.022 0.356 0.558 - C L B1 0.045 0.070 1.15 1.77 8, 10 eA C 0.008 0.014 0.204 C D 0.
PAGE 10
ICM7555, ICM7556 Dual-In-Line Plastic Packages (PDIP) E14.3 (JEDEC MS-001-AA ISSUE D) 14 LEAD DUAL-IN-LINE PLASTIC PACKAGE N E1 INDEX AREA 1 2 3 INCHES N/2 -B- -AE D BASE PLANE -C- A2 SEATING PLANE A L D1 e B1 D1 A1 eC B 0.010 (0.25) M C A B S MILLIMETERS SYMBOL MIN MAX MIN MAX NOTES A - 0.210 - 5.33 4 A1 0.015 - 0.39 - 4 A2 0.115 0.195 2.93 4.95 - B 0.014 0.022 0.356 0.558 - C L B1 0.045 0.070 1.15 1.77 8 eA C 0.008 0.014 C D 0.735 0.
PAGE 11
ICM7555, ICM7556 Ceramic Dual-In-Line Frit Seal Packages (CERDIP) c1 F14.3 MIL-STD-1835 GDIP1-T14 (D-1, CONFIGURATION A) 14 LEAD CERAMIC DUAL-IN-LINE FRIT SEAL PACKAGE LEAD FINISH -D- -A- BASE METAL E M -Bbbb S C A-B S -C- S1 0.200 - 5.08 - 0.026 0.36 0.66 2 b1 0.014 0.023 0.36 0.58 3 b2 0.045 0.065 1.14 1.65 - b3 0.023 0.045 0.58 1.14 4 c 0.008 0.018 0.20 0.46 2 c1 0.008 0.015 0.20 0.38 3 D - 0.785 - 19.94 5 E 0.220 0.310 5.59 7.