NA556, NE556, SA556, SE556
DUAL PRECISION TIMERS
www.ti.com
FEATURES
•
•
•
•
•
Two Precision Timing Circuits Per Package
Astable or Monostable Operation
TTL-Compatible Output Can Sink or Source
up to 150 mA
Active Pullup or Pulldown
Designed to Be Interchangeable With
Signetics NE556, SA556, and SE556
APPLICATIONS
•
•
•
•
•
•
•
•
•
•
•
•
Precision Timers From Microseconds to
Hours
Pulse-Shaping Circuits
Missing-Pulse Detectors
Tone-Burst Generators
Pulse-Width Modulators
Pulse-Position Modulators
Sequential Timers
Pulse Generators
Frequency Dividers
Application Timers
Industrial Controls
Touch-Tone Encoders
SLFS023G – APRIL 1978 – REVISED JUNE 2006
NA556...D OR N PACKAGE
NE556...D, N, OR NS PACKAGE
SA556...D OR N PACKAGE
SE556...J PACKAGE
(TOP VIEW)
1DISCH
1THRES
1CONT
1RESET
1OUT
1TRIG
GND
1
14
2
13
3
12
4
11
5
10
6
7
9
8
VCC
2DISCH
2THRES
2CONT
2RESET
2OUT
2TRIG
DESCRIPTION/ORDERING INFORMATION
These devices provide two independent timing circuits of the NA555, NE555, SA555, or SE555 type in each
package. These circuits can be operated in the astable or the monostable mode with external resistor-capacitor
(RC) timing control. The basic timing provided by the RC time constant can be controlled actively by modulating
the bias of the control-voltage input.
The threshold (THRES) and trigger (TRIG) levels normally are two-thirds and one-third, respectively, of VCC.
These levels can be altered by using the control voltage (CONT) terminal. When the trigger input falls below
trigger level, the flip-flop is set and the output goes high. If the trigger input is above the trigger level and the
threshold input is above the threshold level, the flip-flop is reset, and the output is low. The reset (RESET) input
can override all other inputs and can be used to initiate a new timing cycle. When RESET goes low, the flip-flop
is reset and the output goes low. When the output is low, a low-impedance path is provided between the
discharge (DISCH) terminal and ground (GND).
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 1978–2006, Texas Instruments Incorporated
On products compliant to MIL-PRF-38535, all parameters are
tested unless otherwise noted. On all other products, production
processing does not necessarily include testing of all parameters.
NA556, NE556, SA556, SE556
DUAL PRECISION TIMERS
www.ti.com
SLFS023G – APRIL 1978 – REVISED JUNE 2006
ORDERING INFORMATION
TA
VT (MAX)
VCC = 15 V
PACKAGE (1)
PDIP – N
0°C to 70°C
11.2 V
–40°C to 85°C
11.2 V
–40°C to 105°C
–55°C to 125°C
(1)
NE556N
Tube of 50
NE556D
Reel of 2500
NE556DR
SOP – NS
Reel of 2000
NE556NSR
NE556
PDIP – N
Tube of 25
SA556N
SA556N
PDIP – N
Tube of 25
NA556N
NA556N
Tube of 50
NA556D
Reel of 2500
NA556DR
SOIC – D
10.6 V
CDIP – J
Tube of 25
NE556N
NE556
NA556
SE556J
SE556J
SE556JB
SE556JB
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at
www.ti.com/sc/package.
FUNCTION TABLE
(each timer)
RESET
TRIGGER
VOLTAGE (1)
THRESHOLD
VOLTAGE (1)
OUTPUT
DISCHARGE
SWITCH
Low
Irrelevant
Irrelevant
Low
On
High
1/3 VDD
>2/3 VDD
Low
On
High
>1/3 VDD
很抱歉,暂时无法提供与“NA556D”相匹配的价格&库存,您可以联系我们找货
免费人工找货- 国内价格 香港价格
- 1+11.260061+1.40776
- 10+7.8646210+0.98325
- 50+6.5183450+0.81494
- 100+6.10062100+0.76271
- 250+5.65839250+0.70743
- 500+5.39186500+0.67410
- 1000+5.172531000+0.64668
- 2500+4.940882500+0.61772