STMICROELECTRONICS SE556

NE556
SA556 - SE556

GENERAL PURPOSE DUAL BIPOLAR TIMERS
..
..
.
..
.
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%
PER oC
DESCRIPTION
The NE556 dual 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 oneexternal resistor and capacitor. For a stable operation as
an oscillator, the freerunningfrequencyand theduty
cycle are both accurately controlled with two external resistors and one capacitor. The circuit may be
triggered and reset on falling waveforms, and the
output structure can source or sink up to 200mA.
N
DIP14
(Plastic Package)
D
SO14
(Plastic Micropackage)
ORDER CODES
Part
Number
Temperature
Range
o
o
0 C, 70 C
NE556
Pakcage
N
D
•
•
o
o
•
•
o
o
•
•
SA556
–40 C, 105 C
SE556
–55 C, 125 C
PIN CONNECTIONS (top view)
July 1998
Discharge
1
14
VCC
Thres hold
2
13
Discharge
Control Voltage 3
12
Thres hold
Re s et
4
11
Control Voltage
Output
5
10
Re s et
Trigger
6
9
Output
GND
7
8
Trigge r
1/9
NE556/SA556/SE556
BLOCK DIAGRAM
VC C+
5 kΩ
COMP
DISCHARGE
THRES HOLD
CONTROL VOLTAGE
R
FLIP-FLOP
5 kΩ
Q
COMP
OUT 1/2 NE556
TRIGGER
S
INHIBIT/
RESET
5 kΩ
S
RESET
SCHEMATIC DIAGRAM
CONTROL
VOLTAGE
OUTPUT
THRESHOLD
COMPARATOR
5
VCC
R2
8 30Ω
R1
4.7kΩ
R4 R8
1kΩ 5 kΩ
R3
4 .7kΩ
R12
6.8kΩ
Q21
Q5
Q6
Q7
Q8
Q19
Q9
Q22
Q2 0
Ρ13
3.9 kΩ
R1 1
5kΩ
THRESHOLD
Q1
Q2
Q3
2
Q23
R9
5 kΩ
Q11 Q12
TR IGGER
D2
RES ET
4
3
R14
220 Ω
Q24
Q1 3
Q10
Q16
DISCHARGE
D1
R17
4.7kΩ
Q4
Q18
R16
100 Ω
R15
4.7kΩ
Q1 5
7
Q17
Q14
R5
1 0kΩ
R6
1 00 kΩ
R7
1 0 0kΩ
R10
5 kΩ
1
G ND
TR IGGER COMPARATOR
FLIP FLOP
ABSOLUTE MAXIMUM RATINGS
Symbol
Vcc
Toper
Tj
Tstg
2/9
Parameter
Value
Supply Voltage
Operating Free Air Temperature Range
Junction Temperature
Storage Temperature Range
for NE556
for SA556
for SE556
Unit
18
V
0 to 70
–40 to 105
–55 to 125
°C
150
°C
– 65 to 150
°C
NE556/SA556/SE556
OPERATING CONDITIONS
Symbol
VCC
Vth, Vtrig, Vcl, Vreset
Parameter
Supply Voltage
Maximum Input Voltage
SE556
NE556 - SA556
Unit
4.5 to 18
4.5 to 18
V
VCC
VCC
V
ELECTRICAL CHARACTERISTICS
Tamb = +25oC, VCC = +5V to +15V (unless otherwise specified)
Symbol
Parameter
ICC
Supply Current (R L ∞) (- note 1) - (2 timers)
Low State
VCC = +5V
VCC = +15V
High State
VCC = 5V
VCL
Vth
Ith
Vtrig
Itrig
SE556
Min.
Max.
6
20
4
Timing Error (monostable)
(RA = 2k to 100kΩ, C = 0.1µF)
Initial Accuracy - (note 2)
Drift with Temperature
Drift with Supply Voltage
0.5
30
0.05
Timing Error (astable)
(RA, R B = 1kΩ to 100kΩ, C = 0.1µF,
VCC = +15V)
Initial Accuracy - (note 2)
Drift with Temperature
Drift with Supply Voltage
1.5
90
0.15
Max.
10
24
6
20
4
12
30
2
100
0.2
1
50
0.1
3
0.5
2.25
150
0.3
9
2.6
10
3.33
11
4
Threshold Voltage
VCC = +15V
VCC = +5V
9.4
2.7
10
3.33
10.6
4
8.8
2.4
10
3.33
11.2
4.2
0.1
0.25
0.1
0.25
5
1.67
5.2
1.9
5
1.67
5.6
2.2
0.5
0.9
0.5
2.0
0.7
1
0.7
1
V
V
Threshold Current - (note 3)
µA
V
4.8
1.45
Trigger Current (Vtrig = 0V)
Reset Current
%
ppm/°C
%/V
%
ppm/°C
%/V
10.4
3.8
Trigger Voltage
VCC = +15V
VCC = +5V
Unit
mA
10
3.33
Reset Voltage - (note 4)
0.4
4.5
1.1
0.4
µA
V
mA
0.1
0.4
0.4
1
0.1
0.4
0.4
1.5
Low Level Output Voltage
VCC = +15V, IO(sink) = 10mA
IO(sink) = 50mA
IO(sink) = 100mA
IO(sink) = 200mA
IO(sink) = 8mA
VCC = +5V,
IO(sink) = 5mA
0.1
0.4
2
2.5
0.1
0.05
0.15
0.5
2.2
0.1
0.4
2
2.5
0.3
0.25
0.25
0.75
2.5
High Level Output Voltage
VCC = +15V, IO(source) = 200mA
IO(source) = 100mA
IO(source) = 100mA
VCC = +5V,
12.5
13.3
3.3
Vreset = +0.4V
Vreset = 0V
Notes :
Typ.
9.6
2.9
Ireset
VOH
Min.
Control Voltage level
VCC = +15V
VCC = +5V
Vreset
VOL
NE556 - SA556
Typ.
V
0.25
0.2
0.4
0.35
V
13
3
12.75
2.75
12.5
13.3
3.3
1. Supply current when output is high is typically 1mA less.
2. Tested at VCC = +5V and VCC = +15V.
3. This will determine the maximum value of RA + RB for +15V operation the max total is R = 20MΩ and for 5V operation
the max total R = 3.5MΩ.
4. Specified with trigger input high.
3/9
NE556/SA556/SE556
ELECTRICAL CHARACTERISTICS (continued)
Symbol
Parameter
SE556
Min.
NE556 - SA556
Typ.
Max.
20
100
Min.
Typ.
Max.
20
100
Idis (off)
Discharge Pin Leakage Current
(output high) (Vdis = 10V)
Vdis(sat)
Discharge pin Saturation Voltage
(output low) - (note 5)
VCC = +15V, Idis = 15mA
VCC = +5V, Idis = 4.5mA
180
80
480
200
180
80
480
200
Output Rise Time
Output Fall Time
100
100
200
200
100
100
300
300
Turn off Time - (note 6) (Vreset = VCC)
0.5
tr
tf
toff
Notes :
Unit
nA
mV
0.5
ns
µs
5. No protection against excessive Pin 7 current is necessary, providing the package dissipation rating will not be exceeded.
6. Time mesaured from a positive going input pulse from 0 to 0.8x VCC into the threshold to the drop from high to low of the
output trigger is tied to treshold.
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
4/9
NE556/SA556/SE556
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
5/9
NE556/SA556/SE556
TYPICAL APPLICATION
50% DUTY CYCLE OSCILLATOR
PULSE WIDTH MODULATOR
VCC
VCC
RA
51k Ω
4
14
Rs
(10)
Trigg e r
(13) 1
6 (8)
1/2
NE556
S E556
Output
RA
4
(10)
1/2
NE556
S E556
(12) 2
Output
0.01nF
C
7
(13) 1
6 (8)
22kΩ
(11) 3
5 (9)
14
(12) 2
(11) 3
5 (9)
C
7
MODULATION
INPUT
t1= 0.693 RA.C
 RB − 2RA 
t2 = [(R ARB) ⁄ (RA + R B)] CLn 

 2RB − RA 
1
1
f=
RA ti
RB <
t1+ t2
2
t2
t1
6/9
NE556/SA556/SE556
TONE BURST GENERATOR
For a tone burst generator the first timer is used as a monostable and determines the tone duration when
triggered by a positive pulse at pin 6. The second timer is enabled by the high output os the monostable. It
is connected as an astable and determines the frequency of the tone.
Re s e t
Vcc
4
+15V
14
14
RA
Rt
Trigge r
Trigge r
5
10
6
Output
Re s e t
Discha rge
1
Discha rge
13
RB
1/2
NE556
S E556
1/2
NE556
S E556
12 Thre s hold
8 Trigge r
Control
2
3
Thre s hold
C1
Output
11 C ontrol
9
Ground
0.01 µF
Ground
0.01 µ F
C2
Ground
T = 1.1 R
t
.C1
1.44
f=
R A + 2R B ) C
MONOSTABLE OPERATION
ASTABLE OPERATION
VCC
VCC
RL
RA
4
14
14
(10)
(10)
6 (8)
Trigge r
RL
RA
4
(13) 1
(13) 1
1/2
NE556
S E556
1/2
NE556
S E556
5 (9)
O utput
RB
(12)
(12)
Output
5 (9)
7
(11)
2
RL
7
3
RL
(11)
10nF
C
3
2
(8)
6
C
0.01nF
Opera ting frequency
T = 1.1 R A .C
1.44
f=
R A + 2R B ) C
t1 = 0.693 (RA + RB) C Output High
t2 = 0.693 RBC Output Low
t2
t1
7/9
NE556/SA556/SE556
PACKAGE MECHANICAL DATA
14 PINS - PLASTIC DIP
Dimensions
a1
B
b
b1
D
E
e
e3
F
i
L
Z
8/9
Min.
0.51
1.39
Millimeters
Typ.
Max.
1.65
Min.
0.020
0.055
0.5
0.25
Inches
Typ.
0.065
0.020
0.010
20
0.787
8.5
2.54
15.24
0.335
0.100
0.600
7.1
5.1
0.280
0.201
3.3
1.27
Max.
0.130
2.54
0.050
0.100
NE556/SA556/SE556
PACKAGE MECHANICAL DATA
14 PINS - PLASTIC MICROPACKAGE (SO)
Dimensions
A
a1
a2
b
b1
C
c1
D
E
e
e3
F
G
L
M
S
Min.
Millimeters
Typ.
0.1
0.35
0.19
Max.
1.75
0.2
1.6
0.46
0.25
Min.
Inches
Typ.
0.004
0.014
0.007
0.5
Max.
0.069
0.008
0.063
0.018
0.010
0.020
o
45 (typ.)
8.55
5.8
8.75
6.2
0.336
0.228
1.27
7.62
3.8
4.6
0.5
0.334
0.244
0.050
0.300
4.0
5.3
1.27
0.68
0.150
0.181
0.020
0.157
0.208
0.050
0.027
o
8 (max.)
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result
from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this pub lication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support
devices or systems without express written approval of STMicroelectronics.
 The ST log o is a trademark of STMicroelectronics
 1998 STMicroelectronics – Printed in Italy – All Rights Reserved
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