Philips Semiconductors Linear Products
Product specification
Dual timer
NE/SA/SE556/NE556-1
DESCRIPTION
PIN CONFIGURATION
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.
D, F, N Packages
DISCHARGE
2
13
DISCHARGE
CONTROL VOLTAGE
3
12
THRESHOLD
RESET
4
11
CONTROL VOLTAGE
OUTPUT
5
10
RESET
TRIGGER
6
9
OUTPUT
GND
• 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
14
THRESHOLD
FEATURES
1
7
8
TRIGGER
VCC
• 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
APPLICATIONS
• Precision timing
• Sequential timing
• Pulse shaping
BLOCK DIAGRAM
1
14
13
2
12
DISCHARGE
THRESHOLD
THRESHOLD
COMP
CONTROL VOLTAGE
RESET
COMP
3
11
4
10
TRIGGER
GROUND
®Touch-Tone
CONTROL VOLTAGE
RESET
FLIP FLOP
FLIP FLOP
OUTPUT
VCC
DISCHARGE
5
6
9
COMP
COMP
OUTPUT
8
TRIGGER
7
is a registered trademark of AT&T
August 31, 1994
353
853-0035 13721