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Intersil Electronic Components Datasheet



ICM7556

General Purpose Timers


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ICM7556 pdf
DATASHEET
General Purpose Timers
ICM7555, ICM7556
The ICM7555 and ICM7556 are CMOS RC timers providing
significantly improved performance over the standard
SE/NE 555/556 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
SE/NE 555/556 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.
Pin Configurations
ICM7555
(8 LD PDIP, SOIC)
TOP VIEW
GND 1
TRIGGER 2
OUTPUT 3
RESET 4
8 VDD
7 DISCHARGE
6 THRESHOLD
5
CONTROL
VOLTAGE
Features
• Exact equivalent in most cases for SE/NE 555/556 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°C
• Normal reset function - no crowbarring of supply during
output transition
• Can be used with higher impedance timing elements than
regular 555/556 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, HIGH and LOW
• Pb-free (RoHS Compliant)
Applications
• Precision timing
• Pulse generation
• Sequential timing
• Time delay generation
• Pulse width modulation
• Pulse position modulation
• Missing pulse detector
ICM7556
(14 LD PDIP, CERDIP)
TOP VIEW
DISCHARGE1 1
THRESHOLD1 2
CONTROL
VOLTAGE1
3
RESET1 4
OUTPUT1 5
TRIGGER1 6
GND 7
14 VDD
13 DISCHARGE2
12 THRESHOLD2
11
CONTROL
VOLTAGE2
10 RESET2
9 OUTPUT2
8 TRIGGER2
June 28, 2016
FN2867.10
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2002, 2004-2006, 2016. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.



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ICM7556 pdf
ICM7555, ICM7556
Ordering Information
PART NUMBER
PART MARKING
TEMP. RANGE
(°C)
TAPE AND REEL
(UNITS)
PACKAGE
(RoHS COMPLIANT)
PKG. DWG. #
ICM7555CBAZ (Notes 2, 3)
7555 CBAZ
0 to +70
8 Ld SOIC
M8.15
ICM7555CBAZ-T (Notes 1, 2, 3) 7555 CBAZ
0 to +70
2.5k
8 Ld SOIC (Tape and Reel) M8.15
ICM7555IBAZ (Notes 2, 3)
7555 IBAZ
-25 to +85
8 Ld SOIC
M8.15
ICM7555IBAZ-T (Notes 1, 2, 3)
7555 IBAZ
-25 to +85
2.5k
8 Ld SOIC (Tape and Reel) M8.15
ICM7555IPAZ (Notes 2, 3)
7555 IPAZ
-25 to +85
8 Ld PDIP
E8.3
ICM7556IPDZ (Notes 2, 3)
ICM7556IPDZ
-25 to +85
14 Ld PDIP
E14.3
ICM7556MJD
ICM7556MJD
(No longer available or supported)
-55 to +125
14 Ld Cerdip
F14.3
NOTES:
1. Please refer to TB347 for details on reel specifications.
2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte
tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil
Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
3. For Moisture Sensitivity Level (MSL), please see product information page for ICM7555, ICM7556. For more information on MSL, please see tech brief
TB363.
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FN2867.10
June 28, 2016



Part Number ICM7556
Description General Purpose Timers
Maker Intersil Corporation - Intersil Corporation
Total Page 13 Pages
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