NE556/SA556/SE556
BLOCK DIAGRAM
V
C C
+
5k
Ω
COMP
THRES HOLD
CONTROL VOLTAGE
R
FLIP-FLOP
5k
Ω
COMP
TRIGGER
DISCHARGE
Q
OUT 1/2 NE556
S
INHIBIT/
RESET
5k
Ω
RESET
S
SCHEMATIC DIAGRAM
CONTROL
VOLTAGE
THRESHOLD
COMPARATOR
5
R1
4.7k
Ω
R2
8 30
Ω
R3
4 .7k
Ω
OUTPUT
V
CC
R4 R8
1k
Ω
5k
Ω
R12
6.8kΩ
Q21
Q19
Q2 0
Q22
Q5
Q6
Q7
Q8
Q9
Ρ13
R1 1
5kΩ
THRESHOLD
Q1
Q2
Q3
Q11 Q12
TR IGGER
2
Q10
Q4
3.9 kΩ
3
R17
4.7kΩ
R9
5 kΩ
Q1 3
Q16
Q18
Q23
D2
D1
R14
220
Ω
Q24
R16
100
Ω
R15
4.7kΩ
RES ET
DISCHARGE
4
7
Q14
1
Q1 5
Q17
R5
1 0kΩ
R6
1 00 kΩ
R7
1 0 0kΩ
R10
5kΩ
G ND
TR IGGER COMPARATOR
FLIP FLOP
ABSOLUTE MAXIMUM RATINGS
Symbol
V
cc
T
oper
Supply Voltage
Operating Free Air Temperature Range
for NE556
for SA556
for SE556
Parameter
Value
18
0 to 70
–40 to 105
–55 to 125
150
– 65 to 150
Unit
V
°C
°C
°C
T
j
T
stg
Junction Temperature
Storage Temperature Range
2/9
STMICROELECTRONICS [ STMICROELECTRONICS ]
