
Philips Semiconductors
Product data
NE/SA556
Dual timer
2
2001 Aug 03
853-0035 13721
DESCRIPTION
Both the NE556 and SA556 Dual Monolithic timing circuits are highly
stable controllers capable of producing accurate time delays or
oscillation. The 556 is 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 200 mA.
FEATURES
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
APPLICATIONS
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
PIN CONFIGURATION
D, N Packages
1
2
3
4
5
6
78
14
13
12
11
10
9
DISCHARGE
THRESHOLD
CONTROL VOLTAGE
RESET
OUTPUT
TRIGGER
GND
VCC
DISCHARGE
THRESHOLD
CONTROL VOLTAGE
RESET
OUTPUT
TRIGGER
SL00355
Figure 1. Pin Configuration
ORDERING INFORMATION
DESCRIPTION
TEMPERATURE RANGE
ORDER CODE
DWG #
14-Pin Plastic Small Outline (SO) Package
0 to +70
°C
NE556D
SOT108-1
14-Pin Plastic Dual In-Line Package (DIP)
0 to +70
°C
NE556N
SOT27-1
14-Pin Plastic Dual In-Line Package (DIP)
–40
°C to +85°C
SA556N
SOT27-1
Touch-Tone is a registered trademark of AT&T.