
Philips Semiconductors Linear Products
Product specification
NE/SA/SE556/NE556-1
Dual timer
353
August 31, 1994
853-0035 13721
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 VCC and
ground. The circuits may be triggered and reset on falling
waveforms. The output structures may sink or source 200mA.
FEATURES
Turn-off time less than 2s (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
Precision timing
Sequential timing
Pulse shaping
PIN CONFIGURATION
D, F, N Packages
1
2
3
4
5
6
7
8
14
13
12
11
10
9
DISCHARGE
THRESHOLD
CONTROL VOLTAGE
RESET
OUTPUT
TRIGGER
GND
VCC
DISCHARGE
THRESHOLD
CONTROL VOLTAGE
RESET
OUTPUT
TRIGGER
Pulse generator
Missing pulse detector
Tone burst generator
Pulse width modulation
Time delay generator
Frequency division
Touch-Toneencoder
Industrial controls
Pulse position modulation
Appliance timing
Traffic light control
BLOCK DIAGRAM
DISCHARGE
THRESHOLD
CONTROL VOLTAGE
RESET
OUTPUT
TRIGGER
GROUND
VCC
DISCHARGE
THRESHOLD
CONTROL VOLTAGE
RESET
OUTPUT
TRIGGER
COMP
FLIP FLOP
COMP
FLIP FLOP
COMP
1
2
3
4
5
6
7
14
13
12
11
10
9
8
Touch-Tone is a registered trademark of AT&T