Philips Semiconductors Linear Products Product specification
NE/SA/SE556/NE556-1Dual 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 V
CC
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 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
•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
V
CC
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
V
CC
DISCHARGE
THRESHOLD
CONTROL VOLTAGE
RESET
OUTPUT
TRIGGER
COMP
FLIP FLOP
COMP
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
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