NE555D

Part: NE555DR — Texas Instruments

Type: Precision Timer (555)

Description: Precision timing circuit for monostable and astable operation with a 4.5–16 V supply, ±200 mA TTL-compatible output drive, and timing from microseconds to hours.

Operating Conditions:

• Supply voltage: 4.5–16 V (NA555, NE555, SA555); 4.5–18 V (SE555)
• Operating temperature: 0 to 70 °C (NE555); other family grades: NA555 -40 to 105 °C, SA555 -40 to 85 °C, SE555 -55 to 125 °C
• Output current: ±200 mA max
• Input voltage (CONT, RESET, THRES, TRIG): up to VCC

Absolute Maximum Ratings:

• Max supply voltage: 18 V
• Max output current: ±225 mA
• Max input voltage (CONT, RESET, THRES, TRIG): VCC
• Max operating virtual junction temperature: 150 °C
• Storage temperature: -65 to 150 °C

Key Specs:

• THRES voltage level (NE555, 25 °C): 10 V typ at VCC = 15 V (8.8–11.2 V); 3.3 V typ at VCC = 5 V (2.4–4.2 V)
• TRIG voltage level (NE555, 25 °C): 5 V typ at VCC = 15 V (4.5–5.6 V); 1.67 V typ at VCC = 5 V (1.1–2.2 V)
• Supply current, no load: output low 10 mA typ (15 mA max) at VCC = 15 V, 3 mA typ (6 mA max) at VCC = 5 V; output high 9 mA typ (13 mA max) at VCC = 15 V, 2 mA typ (5 mA max) at VCC = 5 V
• Low-level output voltage (NE555, VCC = 15 V): 0.1 V typ at 10 mA; 0.4 V typ at 50 mA (0.75 V max); 2 V typ at 100 mA (2.5 V max)
• High-level output voltage (VCC = 15 V): 13.3 V typ at -100 mA; 12.5 V typ at -200 mA
• Initial timing error (NE555, monostable): 1% typ, 3% max; astable 2.25% typ
• Temperature coefficient of timing (NE555): 50 ppm/°C typ monostable; 150 ppm/°C typ astable
• Output rise/fall time (CL = 15 pF): 100 ns typ, 300 ns max
• Package thermal impedance θJA (D package): 97 °C/W

Features:

• Timing from microseconds to hours
• Adjustable duty cycle
• Astable or monostable operation
• TTL-compatible output can sink or source up to 200 mA

Applications:

• Precision timing and time delays
• Oscillators and multivibrators
• Missing-pulse detection
• Frequency division
• Pulse-width modulation

Package:

• SOIC-D, 8-pin, reel of 2500 (NE555DR, top-side marking NE555)

• Timing From Microseconds to Hours

SLFS022F-SEPTEMBER 1973-REVISED JUNE 2006

• Adjustable Duty Cycle
• Astable or Monostable Operation

VCC = 5 V to 15 V, T A = 25 ° C (unless otherwise noted)

PARAMETER	TEST CONDITIONS	TEST CONDITIONS	SE555 - MIN	SE555 - TYP	SE555 - MAX	NA555 NE555 SA555 - MIN	NA555 NE555 SA555 - TYP	NA555 NE555 SA555 - MAX	UNIT
THRES voltage level	V CC = 15 V	V CC = 15 V	9.4	10	10.6	8.8	10	11.2	V
	V CC = 5 V	V CC = 5 V	2.7	3.3	4	2.4	3.3	4.2
THRES current (1)				30	250		30	250	nA
TRIG voltage level	V CC = 15 V	T A = -55 ° C to 125 ° C	4.8	5	5.2	4.5	5	5.6	V
TRIG voltage level		T A = -55 ° C to 125 ° C	3		6				V
TRIG voltage level	V CC = 5 V	T A = -55 ° C to 125 ° C	1.45	1.67	1.9	1.1	1.67	2.2
TRIG voltage level		T A = -55 ° C to 125 ° C			1.9
TRIG current	TRIG at 0 V			0.5	0.9		0.5	2	μ A
RESET voltage level			0.3	0.7	1	0.3	0.7	1	V
RESET voltage level	T A = -55 ° C to 125 ° C				1.1				V
RESET current	RESET at V CC	RESET at V CC		0.1	0.4		0.1	0.4
RESET current	RESET at 0 V	RESET at 0 V		-0.4	-1		-0.4	-1.5	mA
DISCH switch off-state current				20	100		20	100	nA
CONT voltage (open circuit)	V = 15 V		9.6	10	10.4	9	10	11	V
CONT voltage (open circuit)	CC	T A = -55 ° C to 125 ° C	9.6		10.4
CONT voltage (open circuit)	V CC = 5 V	T A = -55 ° C to 125 ° C	2.9	3.3	3.8	2.6	3.3	4
Low-level output voltage			2.9		3.8			0.25
Low-level output voltage	V CC = 15 V, I OL = 10 mA			0.1	0.15		0.1
Low-level output voltage		T A = -55 ° C to 125 ° C			0.2 0.5
Low-level output voltage	V = 15 V, I = 50 mA			0.4			0.4	0.75
Low-level output voltage	CC OL	T A = -55 ° C to 125 ° C			1
Low-level output voltage	V = 15 V, I = 100 mA			2	2.2		2	2.5
Low-level output voltage	CC OL	T A = -55 ° C to 125 ° C			2.7				V
Low-level output voltage	V CC = 15 V, I OL = 200 mA			2.5			2.5
Low-level output voltage	V CC = 5 V, I OL = 3.5 mA	T A = -55 ° C to 125 ° C			0.35
Low-level output voltage	V CC = 5 V, I OL = 5 mA			0.1	0.2		0.1	0.35
Low-level output voltage				0.15	0.25	12.75	0.15	0.4
Low-level output voltage	V CC = 5 V, I OL = 8 mA	T A = -55 ° C to 125 ° C			0.8
High-level output voltage	V = 15 V, I = -100 mA		13	13.3			13.3		V
High-level output voltage	CC OL	T A = -55 ° C to 125 ° C	12						V
High-level output voltage	V CC = 15 V, I OH = -200 mA			12.5			12.5		V
High-level output voltage	V CC = 15 V, I OL = -100 mA	T A = -55 ° C to 125 ° C	3 2	3.3		2.75	3.3		V
		V CC = 15 V		10	12		10	15
	Output low, No load	V CC = 5 V		3	5		3	6
Supply current		V CC = 15 V		9	10		9	13	mA
	Output high, No load	V CC = 5 V		2	4		2	5

SLFS022F-SEPTEMBER 1973-REVISED JUNE 2006

over operating free-air temperature range (unless otherwise noted)

			MIN	MAX	UNIT
V CC	Supply voltage (2)	Supply voltage (2)		18	V
V I	Input voltage	CONT, RESET, THRES, TRIG		V CC	V
I O	Output current	Output current		± 225	mA
θ JA	Package thermal impedance (3)(4)	D package		97	° C/W
θ JA	Package thermal impedance (3)(4)	P package		85	° C/W
θ JA	Package thermal impedance (3)(4)	PS package		95	° C/W
θ JA	Package thermal impedance (3)(4)	PW package		149	° C/W
θ JC	Package thermal impedance (5)(6)	FK package		5.61	° C/W
θ JC	Package thermal impedance (5)(6)	JG package		14.5	° C/W
T J	Operating virtual junction temperature	Operating virtual junction temperature		150	° C
	Case temperature for 60 s	FK package		260	° C
	Lead temperature 1, 6 mm (1/16 in) from case for 60 s	JG package		300	° C
T stg	Storage temperature range	Storage temperature range	-65	150	° C

• (3) Maximum power dissipation is a function of T J (max), θ JA , and T A . The maximum allowable power dissipation at any allowable ambient temperature is P D = (T J (max) - T A )/ θ JA. Operating at the absolute maximum T J of 150 ° C can affect reliability.
• (4) The package thermal impedance is calculated in accordance with JESD 51-7.
• (5) Maximum power dissipation is a function of T J (max), θ JC , and T C . The maximum allowable power dissipation at any allowable case temperature is P D = (T J (max) - T C )/ θ JC . Operating at the absolute maximum T J of 150 ° C can affect reliability.
• (6) The package thermal impedance is calculated in accordance with MIL-STD-883.

over operating free-air temperature range (unless otherwise noted)

			MIN	MAX	UNIT
V CC	Supply voltage	NA555, NE555, SA555	4.5	16	V
V CC		SE555	4.5	18	V
V I	Input voltage	CONT, RESET, THRES, and TRIG		V CC	V
I O	Output current			± 200	mA
T A	Operating free-air temperature	NA555	-40	105	° C
T A		NE555	0	70	° C
T A		SA555	-40	85	° C
T A		SE555	-55	125	° C

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Figure 10. Typical Monostable Waveforms

Figure 11. Output Pulse Duration vs Capacitance

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As shown in Figure 12, adding a second resistor, R B , to the circuit of Figure 9 and connecting the trigger input to the threshold input causes the timer to self-trigger and run as a multivibrator. The capacitor C charges through RA and RB and then discharges through RB only. Therefore, the duty cycle is controlled by the values of R A and RB.

ÏÏÏÏÏ ÏÏÏÏÏ Astable Operation

This astable connection results in capacitor C charging and discharging between the threshold-voltage level ( ≈ 0.67 × VCC) and the trigger-voltage level ( ≈ 0.33 × VCC). As in the monostable circuit, charge and discharge times (and, therefore, the frequency and duty cycle) are independent of the supply voltage.

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NOTE A: Decoupling CONT voltage to ground with a capacitor can improve operation. This should be evaluated for individual applications. Pin numbers shown are for the D, JG, P, PS, and PW packages.

Figure 12. Circuit for Astable Operation

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ÎÎÎÎÎÎÎÎÎÎ ÎÎÎÎÎÎÎÎÎÎ ÎÎÎÎÎÎÎÎÎÎ Figure 13. Typical Astable Waveforms

Figure 13 shows typical waveforms generated during astable operation. The output high-level duration t H and low-level duration t L can be calculated as follows:

Other useful relationships are shown below.

$$\text{Output driver duty cycle} = \frac{t_L}{t_H + t_L} = \frac{R_B}{R_A + 2R_B}$$

Output waveform duty cycle