Timing Circuits. XR-559 Datasheet

XR-559 Circuits. Datasheet pdf. Equivalent

XR-559 Datasheet
Recommendation XR-559 Datasheet
Part XR-559
Description Quad Timing Circuits
Feature XR-559; XR-558/559 Quad Timing Circuits GENERAL DESCRIPTION The XR-558 and the XR-559 quad timing circuits .
Manufacture Exar
Datasheet
Download XR-559 Datasheet




Exar XR-559
XR-558/559
Quad Timing Circuits
GENERAL DESCRIPTION
The XR-558 and the XR-559 quad timing circuits con-
tain four independent timer sections on a single mono-
lithic chip. Each of the timer sections on the chip are
entirely independent, and each one can produce a time
delay from microseconds to minutes, as set by an ex-
ternal R-C network. Each timer has its separate trigger
terminal, but all four timers in the IC package share a
common reset control.
Both the XR-558 and the XR-559 quad timer circuits are
"edge-triggered" devices, so that each timer section
can be cascaded, or connected in tandem, with other
timer sections, without requiring coupling capacitors.
The XR-558 is designed with open-collector outputs;
each output can sink up to 100 mA. The XR-559 is de-
signed with emitter-follower outputs. Each output can
source up to 100 mA of load current. The outputs are
normally at "low" state, and go to "high" state during
the timing interval.
FEATURES
Four Independent Timer Sections
High Current Output Capability
XR-558: 100 mA sinking capability/output
XR-559: 100 mA sourcing capability/output
Edge Triggered Controls
Output Stage Independent of Trigger Condition
Wide Supply Range: 4.5 V to 16 V
APPLICATIONS
Precision Timing
Pulse Shaping
Clock Synchronization
Appliance Timing
ABSOLUTE MAXIMUM RATINGS
Power Supply
Power Dissipation
Ceramic Dual-In-Line
Derate above TA = 25"
Plastic Dual-In-Line
Derate above TA = 25"C
Storage Temperature Range
18V
750mW
6 mW/oC
625 mW
5 mW/oC
- 65°C to + 150°C
FUNCTIONAL BLOCK DIAGRAM
OUTPUT 0
TIMING 0
TRIGGER 0
COMMON
RESET
GROUND
TRIGGER C
ORDERING INFORMATION
Part Number
Package
XR-558M
XR-558CN
XR-558CP
XR-559M
XR-559CN
XR-559CP
Ceramic
Ceramic
Plastic
Ceramic
Ceramic
Plastic
TIMING C
OUTPUT C
Operating Temperature
- 55°C to + 125°C
ooe to + 70°C
ooe to + 70°C
- 55°C to + 125°C
ooe to +70°C
ooe to + 70°C
SYSTEM DESCRIPTION
The XR-558 and XR-559 are easy to use quad timers
capable of operation with supply voltages between 4.5
V and 18 V. Each section has independent timing and
triggering, and can operate over intervals ranging from
the low microseconds up through several minutes. The
devices are triggered on falling waveforms and are im-
mune to long trigger pulses. When the reset pin (Pin 13)
is held below 0.8 V, all four outputs are set low and all
triggers are disabled. Timing period. accuracy is typi-
cally better than 1%, independent of Vce, and drift is
better than 150 ppm/oe and 0.5 %N. The timing period,
in seconds, equals R times C.
The XR-558 features open collector outputs, capable of
sinking 100 mA, that are driven low during the timing in-
terval. The XR-559 has emitter followers, active upon
timeout, capable of sourcing 100 mA. The XR-558 sinks
load current from + Vec, the XR·559 sources load cur·
rent to ground.
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Exar XR-559
XR·558/559
ELECTRICAL CHARACTERISTICS
Test Conditions: (TA = 25°C, VCC = + 5V to + 15V, unless otherwise noted.)
XR-558M/XR-559M XR-558C/XR-559C
PARAMETERS
MIN TYP MAX MIN TYP MAX UNITS
CONDITIONS
Supply Voltage
4.5 18 4.5 16 V
Supply Current
XR-558 Family
XR-559 Family
Timing Accuracy
Initial Accuracy
Drift with Temperature
Drift with Supply Voltage
21 32
9 16
13
150
0.1
27 36
12 18
VCC = VRESET = 15V
mA Outputs Open
mA Outputs Open
R = 2 kO to 100 kO
2 % C = 1 ItF
150 ppm/DC
0.1 %/V
Trigger Characteristics
Trigger Voltage
Trigger Current
Reset Characteristics
Reset Voltage
Reset Current
0.8 1.5 2.4 0.8 1.5 2.4
5 30
10 100
0.8 1.5 2.4 0.8 1.5 2.4
50 300
50
See Note: 1
V VCC = 15V
itA VTRIGGER = OV
V See Note: 2
itA
Threshold Characteristics
Threshold Voltage
Threshold Leakage
0.63
15
0.63
15
XVCC
nA
Measured at Timing Pins
(Pins 2, 7, 10 or 15)
XR-558 Output
Characteristics
Output Voltage
Output Voltage
Output Leakage
0.1 0.2
0.7 1.5
10
0.1 0.4
1.0 2.0
10
See Note: 3
V IL = 10 mA
V IL = 100 mA
nA Output High Condition
XR-559 Output
Characteristics
Output Voltage
Output Voltage
13 13.6
12.5 13.3
12.5 13.3
12.0 13.0
See Note: 4
V IL = 10 mA, VCC = 15V
V IL = 100 mA, VCC = 15V
Propagation Delay
XR-558 Family
XR-559 Family
1.0 1.0 Itsec
0.4 0.4 Itsec
Output Rise-time
Output Fall-time
100 100 nsec IL = 100 mA
100 100 nsec IL = 100 mA
NOTES:
1. The trigger functions only on the falling edge of the trigger pulse only after previously being high. After reset the
trigger must be brought high and then low to implement triggering.
2. For reset below 0.8 volts, outputs set low and trigger inhibited. For reset above 2.4 volts, trigger enabled.
3. The XR-558 output structure is open collector which requires a pull up resistor to VCC to sink current. The
output is normally low sinking current.
4. The XR-559 output structure is a darlington emitter follower which requires a pull down resistor to ground to
source current. The output is normally low and sources current only when switched high.
DESCRIPTION OF CIRCUIT OPERATION
The XR-558/559 quad timing circuits are designed to be
used in timing applications ranging from few microsec-
onds up several hours. They provide cost-effective al-
ternative to single-timer IC's in applications requiring a
multiplicity of timing or sequencing functions.
Each quad-timer circuit contains four independent tim-
er sections, where each section can generate a time
delay set by its own resistor and capacitor, external to
the IC. All four timing sections can be used simultane-
ously, or can be interconnected in tandem, for sequen-
tial timing applications. For astable operation, two sec-
tions of the quad-timer IC can be interconnected to pro-
vide an oscillator circuit whose duty-cycle can be
adjusted from close to zero, to nearly 100 %.
The generalized test and evaluation circuit for both the
XR-558 and the XR-559 quad timer circuits is shown in
Figure 1. Note that, the only difference between the two
circuit types is the structure of the output circuitry.
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Exar XR-559
Vee
RESET
LOAD
SWITCH
15581
15591
XRII558/559
The frequency of oscillation can be externally con-
trolled by applying a control-voltage to the control ter-
minal (pin 4). Since the control terminal is common to
all the timer sections, the duty cycle of the output
waveform is not effected by the modulation voltage;
thus the circuit can function as a variable-frequency,
fixed duty-cycle oscillator.
The frequency of oscillation increases as the voltage at
the control terminal (pin 4) is lowered below its open-
circuit value.
Frequency of Oscillation
Figure 1. Generalized Test and Evaluation Circuit for XR-5581
XR-559 Quad Timer Circuits
MONOSTABLE OPERATION
In the monostable, or one-shot mode of operation, it is
necessary to supply two external components, a resis-
tor and a capacitor, for each section of the timer IC. The
timing terminals of those timer-sections not being used
can be left open-circuited. The time period is equal to
the external RC product. A plot of the timing period, T.
as a function of the external R-C combination is shown
in Figure 2.
100 ~--~--~----~--~---'----r-~
10
...
...3. 10
zu
!
:u
« 01
u
U
0001 a -__~__ _~~ _~__~__~____~__~
10 "I 100 "I 1 0 milO m, 100 milO, 10, 100,
TIMING PERIOD. T
Figure 2. Timing Period, T, as a Function of External R-C
Combination (Note: T = 1.0 RC)
ASTABLE OPERATION
For astable, or free-running, operation of the quad timer
circuits, it is desirable to cross-couple two of the timer
sections on the chip, as shown in Figure 3. In this cir-
cuit configuration, the outputs of each section are
direct-coupled to the opposite trigger input. Thus, the
"high" and "low" half-periods of the output can be set
by the external R-C products, as R1 C1 and R2C2, re-
spectively. The frequency of oscillation, and the output
duty-cycle are given as:
r----.---~-.---~-~r__·"cc
Figure 3. Typical Circuit Connection for Astable Operation Us-
ing Two Timer-Sections. (Note: For XR-559, RL1
and RL2 are Connected from Outputs to Ground.)
II
OUTPUT STRUCTURE
The XR-558 family of quad timers have "open-
collector" NPN-type output stages. Each output can in-
dividually sink up to 100 mA of load current. However,
with more than one output active, the total current ca-
pability is limited by the power-dissipation rating of the
IC package (see Absolute Maximum Ratings). In the
normal operation of the circuit, each output will require
a pull-up resistor to + VCC. The output is normally
"low" state (i.e. sinking current) when the timer is at re-
set; and goes to "high" state during the timing cycle.
The XR-559 family of quad timers have Darlington NPN
"emitter-follower" type outputs. Each output can
source up to 100 mA, during its "high" state. The total
amount of output current, available from all outputs, is
limited by the package power dissipation rating. For
normal operation of the circuit, a pull-down resistor is
required from each output to ground. The output of XR-
559 is normally low (i.e. at "off-state"), and goes to
"high" state when the circuit is triggered.
TRIGGER INPUTS
Each timer section of the quad-timer IC's has its own
trigger input. The trigger level is set at nominally + 1.5
V. and the trigger input is edge-triggered on the falling
edge of an input trigger pulse. In other words, for
proper triggering, the trigger signal must first go "high"
and then go "low". If both the trigger and the reset con-
trols are activated, the reset control overrides the trig-
ger input.
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