LMC555CN [TI]

LMC555 CMOS Timer; LMC555 CMOS定时器
LMC555CN
型号: LMC555CN
厂家: TEXAS INSTRUMENTS    TEXAS INSTRUMENTS
描述:

LMC555 CMOS Timer
LMC555 CMOS定时器

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LMC555  
www.ti.com  
SNAS558J FEBRUARY 2000REVISED MARCH 2013  
LMC555 CMOS Timer  
Check for Samples: LMC555  
1
FEATURES  
DESCRIPTION  
2
Less than 1 mW Typical Power Dissipation at  
5V Supply  
The LMC555 is a CMOS version of the industry  
standard 555 series general purpose timers. In  
addition to the standard package (SOIC, VSSSOP,  
and PDIP) the LMC555 is also available in a chip  
sized package (8 Bump DSBGA) using TI's DSBGA  
package technology. The LMC555 offers the same  
capability of generating accurate time delays and  
frequencies as the LM555 but with much lower power  
dissipation and supply current spikes. When operated  
as a one-shot, the time delay is precisely controlled  
by a single external resistor and capacitor. In the  
stable mode the oscillation frequency and duty cycle  
are accurately set by two external resistors and one  
capacitor. The use of Texas Instruments' LMCMOS  
process extends both the frequency range and low  
supply capability.  
3 MHz Astable Frequency Capability  
1.5V Supply Operating Voltage Ensured  
Output Fully Compatible with TTL and CMOS  
Logic at 5V Supply  
Tested to 10 mA, +50 mA Output Current  
Levels  
Reduced Supply Current Spikes During Output  
Transitions  
Extremely Low Reset, Trigger, and Threshold  
Currents  
Excellent Temperature Stability  
Pin-for-Pin Compatible with 555 Series of  
Timers  
Available in 8-pin VSSOP Package and 8-Bump  
DSBGA package  
Pulse Width Modulator  
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
All trademarks are the property of their respective owners.  
2
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 2000–2013, Texas Instruments Incorporated  
LMC555  
SNAS558J FEBRUARY 2000REVISED MARCH 2013  
www.ti.com  
Connection Diagram  
Figure 1. 8-Pin SOIC, VSSOP, PDIP  
Top View  
Figure 2. 8-Bump DSBGA  
Top View (Bump Side Down)  
2
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LMC555  
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SNAS558J FEBRUARY 2000REVISED MARCH 2013  
Table 1. Pin Descriptions  
Package Pin Numbers  
Pin Name  
8-Pin SOIC, VSSOP, and PDIP  
8-Bump DSBGA  
GND  
1
2
3
4
5
6
7
8
A3  
B3  
C3  
C2  
C1  
B1  
A1  
A2  
Trigger  
Output  
Reset  
Control Voltage  
Threshold  
Discharge  
V+  
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam  
during storage or handling to prevent electrostatic damage to the MOS gates.  
Absolute Maximum Ratings(1)(2)(3)  
Supply Voltage, V+  
15V  
0.3V to VS + 0.3V  
15V  
Input Voltages, VTRIG, VRES, VCTRL, VTHRESH  
Output Voltages, VO, VDIS  
Output Current IO, IDIS  
100 mA  
Storage Temperature Range  
65°C to +150°C  
Soldering specification for PDIP package:  
Soldering (10 seconds)  
260°C  
Soldering specification for all other packages:  
see product folder at www.ti.com and http://www.ti.com/lit/SNOA549  
(1) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for  
which the device is functional, but do not ensure specific performance limits. Electrical Characteristics state DC and AC electrical  
specifications under particular test conditions which ensure specific performance limits. This assumes that the device is within the  
Operating Ratings. Specifications are not ensured for parameters where no limit is given, however, the typical value is a good indication  
of device performance.  
(2) See AN-1112 (SNVA009) for DSBGA considerations.  
(3) If Military/Aerospace specified devices are required, please contact the TI Sales Office/Distributors for availability and specifications.  
Operating Ratings(1)(2)  
Temperature Range  
LMC555IM  
40°C to +125°C  
40°C to +85°C  
LMC555CM/MM/N/TP  
Thermal Resistance (θJA  
SOIC, 8-Pin  
(1)  
)
169°C/W  
225°C/W  
111°C/W  
220°C/W  
VSSOP, 8-Pin  
PDIP, 8-Pin  
8-Bump DSBGA  
Maximum Allowable Power Dissipation @25°C  
PDIP-8  
1126 mW  
740 mW  
555 mW  
568 mW  
SOIC-8  
VSSOP-8  
8-Bump DSBGA  
(1) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for  
which the device is functional, but do not ensure specific performance limits. Electrical Characteristics state DC and AC electrical  
specifications under particular test conditions which ensure specific performance limits. This assumes that the device is within the  
Operating Ratings. Specifications are not ensured for parameters where no limit is given, however, the typical value is a good indication  
of device performance.  
(2) See AN-1112 (SNVA009) for DSBGA considerations.  
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Electrical Characteristics(1) (2)  
Test Circuit, T = 25°C, all switches open, RESET to VS unless otherwise noted  
Units  
(Limits)  
Parameter  
Test Conditions  
Min  
Typ  
Max  
IS  
Supply Current  
VS = 1.5V  
VS = 5V  
VS = 12V  
50  
100  
150  
150  
250  
400  
µA  
VCTRL  
Control Voltage  
VS = 1.5V  
VS = 5V  
VS = 12V  
0.8  
2.9  
7.4  
1.0  
3.3  
8.0  
1.2  
3.8  
8.6  
V
mV  
V
VDIS  
VOL  
Discharge Saturation Voltage  
Output Voltage (Low)  
VS = 1.5V, IDIS = 1 mA  
VS = 5V, IDIS = 10 mA  
75  
150  
150  
300  
VS = 1.5V, IO = 1 mA  
VS = 5V, IO = 8 mA  
VS = 12V, IO = 50 mA  
0.2  
0.3  
1.0  
0.4  
0.6  
2.0  
VOH  
Output Voltage  
(High)  
VS = 1.5V, IO = 0.25 mA  
VS = 5V, IO = 2 mA  
1.0  
4.4  
1.25  
4.7  
V
VS = 12V, IO = 10 mA  
10.5  
11.3  
VTRIG  
Trigger Voltage  
VS = 1.5V  
VS = 12V  
0.4  
3.7  
0.5  
4.0  
0.6  
4.3  
V
pA  
V
ITRIG  
VRES  
Trigger Current  
Reset Voltage  
VS = 5V  
10  
(3)  
VS = 1.5V  
0.4  
0.4  
0.7  
0.75  
1.0  
1.1  
VS = 12V  
VS = 5V  
VS = 5V  
VS = 12V  
IRES  
ITHRESH  
IDIS  
Reset Current  
10  
10  
pA  
pA  
nA  
Threshold Current  
Discharge Leakage  
Timing Accuracy  
1.0  
100  
t
SW 2, 4 Closed  
VS = 1.5V  
VS = 5V  
0.9  
1.0  
1.0  
1.1  
1.1  
1.1  
1.25  
1.20  
1.25  
ms  
VS = 12V  
Δt/ΔVS  
Δt/ΔT  
fA  
Timing Shift with Supply  
VS = 5V ± 1V  
0.3  
75  
%/V  
ppm/°C  
kHz  
Timing Shift with Temperature VS = 5V  
Astable Frequency  
SW 1, 3 Closed, VS = 12V  
4.0  
4.8  
3.0  
15  
5.6  
fMAX  
tR, tF  
Maximum Frequency  
Max. Freq. Test Circuit, VS = 5V  
MHz  
ns  
Output Rise and  
Fall Times  
Max. Freq. Test Circuit  
VS = 5V, CL = 10 pF  
tPD  
Trigger Propagation Delay  
VS = 5V, Measure Delay  
from Trigger to Output  
100  
ns  
(1) All voltages are measured with respect to the ground pin, unless otherwise specified.  
(2) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for  
which the device is functional, but do not ensure specific performance limits. Electrical Characteristics state DC and AC electrical  
specifications under particular test conditions which ensure specific performance limits. This assumes that the device is within the  
Operating Ratings. Specifications are not ensured for parameters where no limit is given, however, the typical value is a good indication  
of device performance.  
(3) If the RESET pin is to be used at temperatures of 20°C and below VS is required to be 2.0V or greater.  
4
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SNAS558J FEBRUARY 2000REVISED MARCH 2013  
For device pinout, please see Table 1.  
Figure 3. Test Circuit  
For device pinout, please see Table 1.  
Figure 4. Maximum Frequency Test Circuit  
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APPLICATION INFORMATION  
MONOSTABLE OPERATION  
In this mode of operation, the timer functions as a one-shot (Figure 5). The external capacitor is initially held  
discharged by internal circuitry. Upon application of a negative trigger pulse of less than 1/3 VS to the Trigger  
terminal, the flip-flop is set which both releases the short circuit across the capacitor and drives the output high.  
Figure 5. Monostable (One-Shot)  
The voltage across the capacitor then increases exponentially for a period of tH = 1.1 RAC, which is also the time  
that the output stays high, at the end of which time the voltage equals 2/3 VS. The comparator then resets the  
flip-flop which in turn discharges the capacitor and drives the output to its low state. Figure 6 shows the  
waveforms generated in this mode of operation. Since the charge and the threshold level of the comparator are  
both directly proportional to supply voltage, the timing internal is independent of supply.  
VCC = 5V  
Top Trace: Input 5 V/Div.  
TIME = 0.1 ms/Div. Middle Trace: Output 5 V/Div.  
RA = 9.1 kΩ  
Bottom Trace: Capacitor Voltage 2 V/Div.  
C = 0.01 µF  
Figure 6. Monostable Waveforms  
Reset overrides Trigger, which can override threshold. Therefore the trigger pulse must be shorter than the  
desired tH. The minimum pulse width for the Trigger is 20ns, and it is 400ns for the Reset. During the timing cycle  
when the output is high, the further application of a trigger pulse will not effect the circuit so long as the trigger  
input is returned high at least 10µs before the end of the timing interval. However the circuit can be reset during  
this time by the application of a negative pulse to the reset terminal. The output will then remain in the low state  
until a trigger pulse is again applied.  
When the reset function is not use, it is recommended that it be connected to V+ to avoid any possibility of false  
triggering. Figure 7 is a nomograph for easy determination of RC values for various time delays.  
NOTE  
In monstable operation, the trigger should be driven high before the end of timing cycle.  
6
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Figure 7. Time Delay  
ASTABLE OPERATION  
If the circuit is connected as shown in Figure 8 (Trigger and Threshold terminals connected together) it will  
trigger itself and free run as a multivibrator. The external capacitor charges through RA + RB and discharges  
through RB. Thus the duty cycle may be precisely set by the ratio of these two resistors.  
Figure 8. Astable (Variable Duty Cycle Oscillator)  
In this mode of operation, the capacitor charges and discharges between 1/3 VS and 2/3 VS. As in the triggered  
mode, the charge and discharge times, and therefore the frequency are independent of the supply voltage.  
Figure 9 shows the waveform generated in this mode of operation.  
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VCC = 5V  
Top Trace: Output 5 V/Div.  
Bottom Trace: Capacitor Voltage 1 V/Div.  
TIME = 20 µs/Div.  
RA = 3.9 kΩ  
RB = 9 kΩ  
C = 0.01 µF  
Figure 9. Astable Waveforms  
The charge time (output high) is given by  
t1 = 0.693 (RA + RB)C  
(1)  
(2)  
(3)  
And the discharge time (output low) by:  
t2 = 0.693 (RB)C  
Thus the total period is:  
T = t1 + t2 = 0.693 (RA + 2RB)C  
The frequency of oscillation is:  
(4)  
Figure 10 may be used for quick determination of these RC Values. The duty cycle, as a fraction of total period  
that the output is low, is:  
(5)  
Figure 10. Free Running Frequency  
8
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SNAS558J FEBRUARY 2000REVISED MARCH 2013  
FREQUENCY DIVIDER  
The monostable circuit of Figure 5 can be used as a frequency divider by adjusting the length of the timing cycle.  
Figure 11 shows the waveforms generated in a divide by three circuit.  
VCC = 5V  
Top Trace: Input 4 V/Div.  
TIME = 20 µs/Div. Middle Trace: Output 2 V/Div.  
RA = 9.1 kΩ  
Bottom Trace: Capacitor 2 V/Div.  
C = 0.01 µF  
Figure 11. Frequency Divider Waveforms  
PULSE WIDTH MODULATOR  
When the timer is connected in the monostable mode and triggered with a continuous pulse train, the output  
pulse width can be modulated by a signal applied to the Control Voltage Terminal. Figure 12 shows the circuit,  
and in Figure 13 are some waveform examples.  
Figure 12. Pulse Width Modulator  
VCC = 5V  
Top Trace: Modulation 1 V/Div.  
TIME = 0.2 ms/Div. Bottom Trace: Output Voltage 2 V/Div.  
RA = 9.1 kΩ  
C = 0.01 µF  
Figure 13. Pulse Width Modulator Waveforms  
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PULSE POSITION MODULATOR  
This application uses the timer connected for astable operation, as in Figure 14, with a modulating signal again  
applied to the control voltage terminal. The pulse position varies with the modulating signal, since the threshold  
voltage and hence the time delay is varied. Figure 15 shows the waveforms generated for a triangle wave  
modulation signal.  
Figure 14. Pulse Position Modulator  
VCC = 5V  
Top Trace: Modulation Input 1 V/Div.  
Bottom Trace: Output Voltage 2 V/Div.  
TIME = 0.1 ms/Div.  
RA = 3.9 kΩ  
RB = 3 kΩ  
C = 0.01 µF  
Figure 15. Pulse Position Modulator Waveforms  
50% DUTY CYCLE OSCILLATOR  
The frequency of oscillation is  
f = 1/(1.4 RCC)  
Figure 16. 50% Duty Cycle Oscillator  
10  
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LMC555  
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SNAS558J FEBRUARY 2000REVISED MARCH 2013  
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SNAS558J FEBRUARY 2000REVISED MARCH 2013  
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REVISION HISTORY  
Changes from Revision I (March 2013) to Revision J  
Page  
Changed layout of National Data Sheet to TI format .......................................................................................................... 10  
12  
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PACKAGE OPTION ADDENDUM  
www.ti.com  
15-May-2013  
PACKAGING INFORMATION  
Orderable Device  
LMC555CM  
Status Package Type Package Pins Package  
Eco Plan Lead/Ball Finish  
MSL Peak Temp  
Op Temp (°C)  
-40 to 85  
Top-Side Markings  
Samples  
Drawing  
Qty  
(1)  
(2)  
(3)  
(4)  
ACTIVE  
SOIC  
SOIC  
D
8
8
95  
TBD  
Call TI  
CU SN  
Call TI  
LMC  
555CM  
LMC555CM/NOPB  
ACTIVE  
D
95  
Green (RoHS  
& no Sb/Br)  
Level-1-260C-UNLIM  
-40 to 85  
LMC  
555CM  
LMC555CMM  
ACTIVE  
ACTIVE  
VSSOP  
VSSOP  
DGK  
DGK  
8
8
1000  
1000  
TBD  
Call TI  
CU SN  
Call TI  
-40 to 85  
-40 to 85  
ZC5  
LMC555CMM/NOPB  
Green (RoHS  
& no Sb/Br)  
Level-1-260C-UNLIM  
ZC5  
LMC555CMMX  
ACTIVE  
ACTIVE  
VSSOP  
VSSOP  
DGK  
DGK  
8
8
3500  
3500  
TBD  
Call TI  
CU SN  
Call TI  
-40 to 85  
-40 to 85  
ZC5  
ZC5  
LMC555CMMX/NOPB  
Green (RoHS  
& no Sb/Br)  
Level-1-260C-UNLIM  
LMC555CMX  
LMC555CMX/NOPB  
LMC555CN  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
SOIC  
SOIC  
D
D
8
8
8
8
8
8
8
8
2500  
2500  
40  
TBD  
Call TI  
CU SN  
Call TI  
Call TI  
-40 to 85  
-40 to 85  
-40 to 85  
-40 to 85  
-40 to 85  
-40 to 85  
-40 to 85  
-40 to 85  
LMC  
555CM  
Green (RoHS  
& no Sb/Br)  
Level-1-260C-UNLIM  
Call TI  
LMC  
555CM  
PDIP  
P
TBD  
LMC  
555CN  
LMC555CN/NOPB  
LMC555CTP/NOPB  
LMC555CTPX/NOPB  
LMC555IM/NOPB  
LMC555IMX/NOPB  
PDIP  
P
40  
Green (RoHS  
& no Sb/Br)  
Call TI  
Level-1-NA-UNLIM  
Level-1-260C-UNLIM  
Level-1-260C-UNLIM  
Level-1-260C-UNLIM  
Call TI  
LMC  
555CN  
DSBGA  
DSBGA  
SOIC  
YPB  
YPB  
D
250  
3000  
95  
Green (RoHS  
& no Sb/Br)  
SNAGCU  
SNAGCU  
CU SN  
Call TI  
F
02  
Green (RoHS  
& no Sb/Br)  
F
02  
Green (RoHS  
& no Sb/Br)  
LMC  
555IM  
SOIC  
D
2500  
TBD  
LMC  
555IM  
(1) The marketing status values are defined as follows:  
ACTIVE: Product device recommended for new designs.  
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.  
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.  
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.  
OBSOLETE: TI has discontinued the production of the device.  
Addendum-Page 1  
PACKAGE OPTION ADDENDUM  
www.ti.com  
15-May-2013  
(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability  
information and additional product content details.  
TBD: The Pb-Free/Green conversion plan has not been defined.  
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that  
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.  
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between  
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.  
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight  
in homogeneous material)  
(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.  
(4)  
Multiple Top-Side Markings will be inside parentheses. Only one Top-Side Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a  
continuation of the previous line and the two combined represent the entire Top-Side Marking for that device.  
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information  
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and  
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.  
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.  
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.  
Addendum-Page 2  
PACKAGE MATERIALS INFORMATION  
www.ti.com  
26-Mar-2013  
TAPE AND REEL INFORMATION  
*All dimensions are nominal  
Device  
Package Package Pins  
Type Drawing  
SPQ  
Reel  
Reel  
A0  
B0  
K0  
P1  
W
Pin1  
Diameter Width (mm) (mm) (mm) (mm) (mm) Quadrant  
(mm) W1 (mm)  
LMC555CMM  
LMC555CMM/NOPB  
LMC555CMMX  
VSSOP  
VSSOP  
VSSOP  
VSSOP  
SOIC  
DGK  
DGK  
DGK  
DGK  
D
8
8
8
8
8
8
8
8
1000  
1000  
3500  
3500  
2500  
2500  
250  
178.0  
178.0  
330.0  
330.0  
330.0  
330.0  
178.0  
178.0  
12.4  
12.4  
12.4  
12.4  
12.4  
12.4  
8.4  
5.3  
5.3  
5.3  
5.3  
6.5  
6.5  
1.5  
1.5  
3.4  
3.4  
3.4  
3.4  
5.4  
5.4  
1.5  
1.5  
1.4  
1.4  
8.0  
8.0  
8.0  
8.0  
8.0  
8.0  
4.0  
4.0  
12.0  
12.0  
12.0  
12.0  
12.0  
12.0  
8.0  
Q1  
Q1  
Q1  
Q1  
Q1  
Q1  
Q1  
Q1  
1.4  
LMC555CMMX/NOPB  
LMC555CMX  
1.4  
2.0  
LMC555CMX/NOPB  
LMC555CTP/NOPB  
LMC555CTPX/NOPB  
SOIC  
D
2.0  
DSBGA  
DSBGA  
YPB  
YPB  
0.66  
0.66  
3000  
8.4  
8.0  
Pack Materials-Page 1  
PACKAGE MATERIALS INFORMATION  
www.ti.com  
26-Mar-2013  
*All dimensions are nominal  
Device  
Package Type Package Drawing Pins  
SPQ  
Length (mm) Width (mm) Height (mm)  
LMC555CMM  
LMC555CMM/NOPB  
LMC555CMMX  
VSSOP  
VSSOP  
VSSOP  
VSSOP  
SOIC  
DGK  
DGK  
DGK  
DGK  
D
8
8
8
8
8
8
8
8
1000  
1000  
3500  
3500  
2500  
2500  
250  
210.0  
210.0  
367.0  
367.0  
367.0  
367.0  
210.0  
210.0  
185.0  
185.0  
367.0  
367.0  
367.0  
367.0  
185.0  
185.0  
35.0  
35.0  
35.0  
35.0  
35.0  
35.0  
35.0  
35.0  
LMC555CMMX/NOPB  
LMC555CMX  
LMC555CMX/NOPB  
LMC555CTP/NOPB  
LMC555CTPX/NOPB  
SOIC  
D
DSBGA  
DSBGA  
YPB  
YPB  
3000  
Pack Materials-Page 2  
MECHANICAL DATA  
YPB0008  
D
0.5±0.045  
E
TPA08XXX (Rev A)  
D: Max = 1.464 mm, Min =1.403 mm  
E: Max = 1.438 mm, Min =1.377 mm  
4215100/A  
12/12  
A. All linear dimensions are in millimeters. Dimensioning and tolerancing per ASME Y14.5M-1994.  
B. This drawing is subject to change without notice.  
NOTES:  
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