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STMicroelectronics Electronic Components Datasheet

NE556 Datasheet

GENERAL PURPOSE DUAL BIPOLAR TIMERS

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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
N
DIP14
(Plastic Package)
D
SO14
(Plastic Micropackage)
DE S CRI P T IO N
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 op-
eration, the time is precisely controlled by oneexter-
nal resistor and capacitor. For a stable operation as
an oscillator, the freerunningfrequencyand theduty
cycle are both accurately controlled with two exter-
nal 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.
ORDER CODES
Part
Number
NE556
SA556
SE556
Temperature
Range
0oC, 70oC
–40oC, 105oC
–55oC, 125oC
Pakcage
ND
••
••
••
PIN CONNECTIONS (top view)
Discharge 1
Thres hold 2
Control Voltage 3
Reset 4
Output 5
Trigger 6
GND 7
14 VCC
13 Discharge
12 Thres hold
11 Control Voltage
10 Re set
9 Output
8 Trigge r
July 1998
1/9


STMicroelectronics Electronic Components Datasheet

NE556 Datasheet

GENERAL PURPOSE DUAL BIPOLAR TIMERS

No Preview Available !

NE556/SA556/SE556
BLOCK DIAGRAM
VC
+
C
THRES HOLD
CONTROL VOLTAGE
TR IGGE R
RESET
5 k
C O MP
R
FLIP-FLOP
5 k
COMP
Q
S
INHIBIT/
RESET
5 k
S
DISCHARGE
OUT 1/2 NE556
SCHEMATIC DIAGRAM
THRE S HOLD
COMPARATOR
VCC
R1
4. 7k
R2 R3
8 304 .7k
CONTROL
VOLTAGE
R4 R8
1k5 k
5
Q5 Q6 Q7
Q8 Q9
Q1 9
THRE S HOLD
TR IGGER
RES ET
DISC HARGE
G ND
R11
5k
Q1
Q2
Q4
Q3
Q11 Q12
R9
5 k
D2
2 Q10 Q1 3
Q16
4
Q15
7
Q14
1
R5
1 0k
R6
1 00 k
R7
1 0 0k
Q1 7
R1 0
5 k
OUTPUT
R12
6.8k
Q20
Q21
Ρ13
3.9 k
Q22
R17
4.7k
Q2 3
D1 3
R14
220
Q2 4
Q18
R16 R15
100 4.7k
TR IGGER COMPARATOR
FLIP FLOP
ABSOLUTE MAXIMUM RATINGS
Symbol
Vcc
Toper
Tj
Tstg
Parameter
Supply Voltage
Operating Free Air Temperature Range
for NE556
for SA556
for SE556
Junction Temperature
Storage Temperature Range
2/9
Value
18
0 to 70
–40 to 105
–55 to 125
150
– 65 to 150
Unit
V
°C
°C
°C


Part Number NE556
Description GENERAL PURPOSE DUAL BIPOLAR TIMERS
Maker ST Microelectronics
Total Page 9 Pages
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