Philips Semiconductors Linear Products
Product specification
Dual timer
NE/SA/SE556/NE556-1
DESCRIPTION
Both the 556 and 556-1 Dual Monolithic timing circuits are highly
stable controllers capable of producing accurate time delays or
oscillation. The 556 and 556-1 are a dual 555. Timing is provided by
an external resistor and capacitor for each timing function. The two
timers operate independently of each other, sharing only V
CC
and
ground. The circuits may be triggered and reset on falling
waveforms. The output structures may sink or source 200mA.
PIN CONFIGURATION
D, F, N Packages
DISCHARGE
THRESHOLD
CONTROL VOLTAGE
RESET
1
2
3
4
5
6
7
14
13
12
11
10
9
8
V
CC
DISCHARGE
THRESHOLD
CONTROL VOLTAGE
RESET
OUTPUT
TRIGGER
FEATURES
•
Turn-off time less than 2µs (556-1)
•
Maximum operating frequency >500kHz (556-1)
•
Timing from microseconds to hours
•
Replaces two 555 timers
•
Operates in both astable and monostable modes
•
High output current
•
Adjustable duty cycle
•
TTL compatible
•
Temperature stability of 0.005%/°C
•
SE556-1 compliant to MIL-STD or JAN
APPLICATIONS
OUTPUT
TRIGGER
GND
•
Precision timing
•
Sequential timing
•
Pulse shaping
•
Pulse generator
•
Missing pulse detector
•
Tone burst generator
•
Pulse width modulation
•
Time delay generator
•
Frequency division
•
Touch-Tone®encoder
•
Industrial controls
•
Pulse position modulation
•
Appliance timing
•
Traffic light control
BLOCK DIAGRAM
1
DISCHARGE
2
COMP
CONTROL VOLTAGE
RESET
3
4
COMP
11
10
RESET
CONTROL VOLTAGE
14
13
V
CC
DISCHARGE
THRESHOLD
12
THRESHOLD
FLIP FLOP
FLIP FLOP
OUTPUT
5
9
OUTPUT
TRIGGER
6
COMP
COMP
8
TRIGGER
GROUND
®
Touch-Tone
7
is a registered trademark of AT&T
August 31, 1994
353
853-0035 13721
PHILIPS [ NXP SEMICONDUCTORS ]
