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XR-556 Datasheet Preview

XR-556 Datasheet

Dual Timer

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XR-556
Dual Timer
GENERAL DESCRIPTION
The XR-556 dual timing circuit contains two indepen-
dent 555-type timers on a single monolithic chip. It is a
direct, pin-for-pin replacement for the SEINE 556 dual
timer. Each timer section is a highly stable controller
capable of producing accurate time delays or oscilla-
tions. Independent output and control terminals are
provided for each section as shown in the functional
block diagram.
In the monostable mode of operation, the time delay for
each section is precisely controlled by one external re-
sistor and one capacitor. For astable operation as an
oscillator, the free-running frequency and the duty cy-
cle of each section are accurately controlled with two
external resistors and one capacitor.
The XR-556 may be triggered or reset on falling wave-
forms. Each output can source or sink up to 150 mA or
drive TIL circuits. The matching and temperature track-
ing characteristics between each timer section of the
XR-556 are superior to those available from two sepa-
rate timer packages.
FEATURES
Direct Replacement for SEINE 556
Replaces Two 555-Type Timers
TIL Compatible Pinouts
Timing from Microseconds Thru Hours
Excellent Matching Between Timer Sections
Operates in Both Monostable and Astable Modes
High Current Drive Capability (150 mA each output)
TIL and DTL Compatible Outputs
Adjustable Duty Cycle
Temperature Stability of 0.005%IOC
APPLICATIONS
Precision Timing
Pulse Generation
Sequential Timing
Pulse Shaping
Time Delay Generation
Clock Pattern Generation
Missing Pulse Detection
Pulse-Width Modulation
Frequency Division
Clock Synchronization
Pulse-Position Modulation
Appliance Timing
FUNCTIONAL BLOCK DIAGRAM
DISCHARGE
THRESHOLD
CONTROL
VOLTAGE
RESET
OUTPUT
TRIGGER
GROUND
DISCHARGE
THRESHOLD
CONTROL
VOLTAGE
RESET
OUTPUT
TRIGGER
ABSOLUTE MAXIMUM RATINGS
Power Supply
Power DisSipation
Ceramic Dual-In-Line
Derate above TA = 25°C
Plastic Dual-In-Line
Derate above TA = 25°C
Storage Temperature Range
18V
750 mW
6 mW/oC
625 mW
5 mW/oC
- 65°C to + 150°C
ORDERING INFORMATION
Part Number
XR-556M
XR-556CN
XR-556CP
Package
Ceramic
Ceramic
Plastic
Operating Temperature
- 55°C to + 125°C
O°C to + 70°C
O°C to +70°C
SYSTEM DESCRIPTION
The XR-556 is an industry standard dual timing circuit
capable of both monostable and astable operation with
timing intervals ranging from low microseconds up
through several hours. Timing is independent of supply
voltage, which may range from, 4.5 V to 18 V. The out-
put stage can source or sink 150 mAo Each timer sec-
tion is fully independent and similar to 555-type de-
vices.
5-82




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XR-556 Datasheet Preview

XR-556 Datasheet

Dual Timer

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XR·556
CONTROL
023 OUTPUT
OISCHARGE
°24
GNO~
-=
-=
EQUIVALENT SCHEMATIC DIAGRAM
SYSTEM DESCRIPTION (continued)
In the monostable (one shot) mode, timing is deter-
mined by one resistor and capacitor. Astable operation
(oscillation) requires an additional resistor, which con-
trols duty cycle. An internal resistive divider provides a
reference voltage of 2/3 VCC, which produces a timing
interval of 1.1 RC. As the reference is related to VCC,
the interval is independent of supply voltage; however,
for maximum accuracy, the user should ensure VCC
does not vary during timing.
The output of the XR-556 is high during the timing inter-
val, and pulls low at timeout. It is triggered and reset on
falling waveforms. The control voltage inputs (Pins 3
and 11) may serve as pulse width modulation points.
Matching between sections is typically better than
0.05% initially, with temperature drift tracking to ± 10
ppm/oC and supply voltage drift tracking to 0.1 %IV. For
low voltage and/or low power drain applications, con-
sider the XR-L556.
5-83


Part Number XR-556
Description Dual Timer
Maker Exar
Total Page 3 Pages
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