NE555DT ,GENERAL PURPOSE SINGLE BIPOLAR TIMERSABSOLUTE MAXIMUM RATINGSSymbol Parameter Value UnitV Supply Voltage 18 VccoT Operating Free Air Tem ..
NE555DT ,GENERAL PURPOSE SINGLE BIPOLAR TIMERSELECTRICAL CHARACTERISTICSoTamb = +25 C, VCC = +5V to +15V (unless otherwise specified)SE555 NE555 ..
NE555DT ,GENERAL PURPOSE SINGLE BIPOLAR TIMERSELECTRICAL CHARACTERISTICSoTamb = +25 C, VCC = +5V to +15V (unless otherwise specified)SE555 NE555 ..
NE555DT ,GENERAL PURPOSE SINGLE BIPOLAR TIMERSELECTRICAL CHARACTERISTICSoTamb = +25 C, VCC = +5V to +15V (unless otherwise specified)SE555 NE555 ..
NE555DT ,GENERAL PURPOSE SINGLE BIPOLAR TIMERSNE555SA555 - SE555®GENERAL PURPOSE SINGLE BIPOLAR TIMERS. LOW TURN OFF TIME.MAXIMUM OPERATING FREQU ..
NE555D-T ,GENERAL PURPOSE SINGLE BIPOLAR TIMERSBLOCK DIAGRAM+VCC5kΩCOMPDISCHARGETHRESHOLDRCONTROL VOLTAGEFLIP-FLOPQ5kΩCOMPOUTTRIGGERSINHIBIT/ RESE ..
NL17SV08XV5T2 ,2-Input AND Gate, Ultra-Low Voltage2NL17SV08XV5T2DC CHARACTERISTICS– Digital Section (Voltages Referenced to GND)T = 25°C T = −40 to 8 ..
NL17SV08XV5T2G , Single 2−Input AND Gate
NL17SV16XV5T2 ,Non Inverting Buffer, Ultra Low Voltage2NL17SV16XV5T2DC CHARACTERISTICS– Digital Section (Voltages Referenced to GND)T = 25°C T = −40 to 8 ..
NL17SV32XV5T2 ,2-Input OR Gate, Ultra-Low Voltage
NL17SV32XV5T2G , Single Gate 2−Input OR Gate
NL17SZ00 ,Single 2 Input NAND GateELECTRICAL CHARACTERISTICS t = t = 3.0 nsR FT = 25C 40C T 85CA AV VCC CC(V) Min Typ Max Min ..
NE555-NE555DT-NE555D-T-SA555-SA555DT-SA555N
Single timer. Supply voltage Vcc=4.5V,min; Vcc=16V,max. Supply current: Icc=3mA,typ; Icc=6mA,max (Vcc=5V); Icc=7.5mA,typ; Icc=15mA.max (Vcc=15V).
July 1998
PIN CONNECTIONS (top view) LOW TURN OFF TIME. MAXIMUM OPERATING FREQUENCY
GREATER THAN 500kHz. TIMING FROM MICROSECONDS TO HOURS. OPERATES IN BOTH ASTABLE AND
MONOSTABLE MODES. HIGH OUTPUT CURRENT CAN SOURCE OR
SINK 200mA. ADJUSTABLE DUTY CYCLE. TTL COMPATIBLE. TEMPERATURE STABILITY OF 0.005%
PERoC
ORDER CODES
DESCRIPTIONThe NE555 monolithic timing circuit is a highly stable
controller capable of producing accurate time delays
or oscillation. In the time delay mode of operation,
the time is precisely controlled by one external re-
sistor and capacitor. For a stable operation as an os-
cillator, the free running frequency and the duty cy-
cle are both accurately controlled with two external
resistors and one capacitor. The circuit may be trig-
gered and reset on falling waveforms, and the out-
put structure can source or sink up to 200mA. The
NE555 is available in plastic and ceramic minidip
package and in a 8-lead micropackage and in metal
can package version.
NE555
SA555 - SE555GENERAL PURPOSE SINGLE BIPOLAR TIMERS
1/10
BLOCK DIAGRAM
SCHEMATIC DIAGRAM
ABSOLUTE MAXIMUM RATINGS
NE555/SA555/SE5552/10
ELECTRICAL CHARACTERISTICSTamb = +25o C, VCC = +5V to +15V (unless otherwise specified)
OPERATING CONDITIONS
NE555/SA555/SE5553/10
ELECTRICAL CHARACTERISTICS (continued)
Figure 1 : Minimum Pulse Width Required for
Trigering
Figure 2 : Supply Current versus Supply Voltage
Figure 3 : Delay Time versus Temperature
Figure 4 : Low Output Voltage versus Output
Sink Current
NE555/SA555/SE5554/10
Figure 5 : Low Output Voltage versus Output
Sink Current
Figure 6 : Low Output Voltage versus Output
Sink Current
Figure 7 : High Output Voltage Drop versus
Output
Figure 8 : Delay Time versus Supply Voltage
Figure 9 : Propagation Delay versus Voltage
Level of Trigger Value
NE555/SA555/SE5555/10
CAPACITOR VOLTAGE = 2.0V/div
t = 0.1 ms / div
R1 = 9.1kΩ, C1 = 0.01μF, R = 1kΩL
Figure 11
Figure 10(μF)
0.001 100 1.0 10 100 10 (t )dμs μs ms ms ms s
Figure 12
APPLICATION INFORMATIONMONOSTABLE OPERATION
In the monostable mode, the timer functions as a
one-shot. Referring to figure 10 the external capaci-
tor is initially held discharged by a transistor inside
the timer.
The circuit triggers on a negative-going input signal
when the level reaches 1/3 Vcc. Once triggered, the
circuit remains in this state until the set time has
elapsed, even if it is triggered again during this in-
terval. The duration of the output HIGH state is given
by t = 1.1 R1C1 and is easily determined by
figure 12.
Notice that since the charge rate and the threshold
level of the comparator are both directly proportional
to supply voltage, the timing interval is independent
of supply. Applying a negative pulse simultaneously
to the reset terminal (pin 4) and the trigger terminal
(pin 2) during the timing cycle discharges the exter-
nal capacitor and causes the cycle to start over. The
timing cycle now starts on the positive edge of the
reset pulse. During the time the reset pulse in ap-
plied, the output is driven to its LOW state.
When a negative trigger pulse is applied to pin 2, the
flip-flop is set, releasing the short circuit across the
external capacitor and driving the output HIGH. The
voltage across the capacitor increases exponen-
tially with the time constant τ = R1C1. When the volt-
age across the capacitor equals 2/3 Vcc, the compa-
rator resets the flip-flop which then discharge the ca-
pacitor rapidly and drivers the output to its LOW
state.
Figure 11 shows the actual waveforms generated in
this mode of operation.
When Reset is not used, it should be tied high to
avoid any possibly or false triggering.
ASTABLE OPERATION
When the circuit is connected as shown in figure 13
(pin 2 and 6 connected) it triggers itself and free runs
as a multivibrator. The external capacitor charges
through R1 and R2 and discharges through R2 only.
Thus the duty cycle may be precisely set by the ratio
of these two resistors.
In the astable mode of operation, C1 charges and
discharges between 1/3 Vcc and 2/3 Vcc. As in the
triggered mode, the charge and discharge times and
therefore frequency are independent of the supply
voltage.
NE555/SA555/SE5556/10
