ALD4501
QUAD PRECISION HIGH SPEED MICROPOWER TIMER
PIN CONFIGURATION
APPLICATIONS
.
High speed one-shot (monostable)
pulse generation
Precision timing
Sequential timing
Long delay timer
Pulse width and pulse position
modulation
Missing pulse detector
Frequency divider
Synchronized timer
GENERAL DESCRIPTION
The ALD4501 timer is a high performance QUAD monolithic timing circuit
built with advanced silicon gate CMOS technology. It offers the benefits of
high input impedance, thereby allowing smaller timing capacitors and
longer timing cycle; high speed with typical cycle time of 500ns; low power
dissipation for battery operated environment; and reduced supply current
spikes allowing smaller and lower cost decoupling capacitors. Each of the
four timers can be independently operated in either the monostable,
astable, or 50% duty cycle mode.
Each timer is capable of producing accurate time delays and oscillations in
both monostable and astable operation. It operates in the one-shot
(monostable) mode or 50% duty cycle free running oscillation mode with a
single resistor and one capacitor. The inputs and outputs are fully
compatible with CMOS, NMOS or TTL logic.
There are three matched internal resistors (approximately 200K
each)
that set the threshold and trigger levels at two-thirds and one-third respec-
tively of V
+
.
These levels can be adjusted by using the control terminal.
When the trigger input is below the trigger level, the output is in the high
state and sourcing 2mA. When the threshold input is above the threshold
level at the same time the trigger input is above the trigger level, the internal
flip-flop is reset, the output goes to the low state and sinks up to 10mA. The
reset input overrides all other inputs and when it is active (reset voltage less
than 1V), the output is in the low state. All four timers share the same control
and reset pins so that timing functions are synchronized.
FEATURES
High speed operation -- 2MHz typical oscillation at 5V
Each discharge output sinking current: 40mA at 5V
Guaranteed low operating supply voltage of 2 to 12V
Each timer is functionally equivalent to NE555 with greatly expanded
high and low frequency ranges
High speed, low power, monolithic CMOS technology
Low supply current 150
A typical
Extremely low trigger, threshold and reset currents -- 10pA typical
Operates in both monostable and astable modes
Fixed 50% duty cycle or adjustable duty cycle
CMOS, NMOS and TTL compatible input/output
Low supply current spikes
BLOCK DIAGRAM (EACH TIMER)
A
DVANCED
L
INEAR
D
EVICES,
I
NC.
Operating Temperature Range *
-55
C to +125
C
0
C to +70
C
0
C to +70
C
20-Pin
20-Pin
20-Pin
CERDIP
Small Outline
Plastic Dip
Package
Package (SOIC)
Package
ALD4501 DE
ALD4501 SE
ALD4501 PE
ORDERING INFORMATION
* Contact factory for industrial temperature range
DE, PE, SE PACKAGE
V
+
OUT
1
THRES
1
OUT
2
THRES
2
OUT
3
THRES
3
OUT
4
CONT
DSC
1
TRIG
1
DSC
2
TRIG
2
DSC
3
TRIG
3
DSC
4
TRIG
4
THRES
4
V
-
RST
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
OUTPUT
DISCHARGE
RESET
R
S
R
R
R
TRIGGER
CONTROL
THRESHOLD
V+
V-
1998 Advanced Linear Devices, Inc. 415 Tasman Drive, Sunnyvale, California 94089 -1706 Tel: (408) 747-1155 Fax: (408) 747-1286 http://www.aldinc.com
ALD4501
Advanced Linear Devices
9-2
OPERATING ELECTRICAL CHARACTERISTICS
T
A
= 25
o
C
V+
= +5V unless otherwise specified
Parameter
Symbol
Min
Typ
Max
Unit
Test Conditions
Supply Voltage
V+
2
12
V
Supply Current
I
S
150
270
A
Outputs Unloaded
Timing error / Astable mode
t
err
1.0
2.6
%
C = 0.1
F
Initial Accuracy
Drift with Temperature
1
t/
T
10.0
ppm/
C
R
A
= 1K
Drift with Supply Voltage
1
t/
V+
0.1
%/V
R
B
= 1K
Threshold Voltage
V
TH
3.233
3.333
3.433
V
Trigger Voltage
V
TRIG
1.567
1.667
1.767
V
Trigger Current
2
I
TRIG
.01
0.4
nA
Reset Voltage
V
RST
0.4
0.7
1.0
V
Reset Current
2
I
RST
.01
0.4
nA
Threshold Current
2
I
TH
.01
0.4
nA
Control Voltage Level
V
CONT
3.233
3.333
3.433
V
Output Voltage Drop (Low)
V
OL
0.2
0.4
V
I
SINK
= 10mA
Output Voltage Drop (High)
V
OH
4.2
4.6
V
I
SOURCE
= -2mA
Rise Time of Output
1
t
r
10
20
ns
R
L
= 10M
Fall Time of Output
1
t
f
10
20
ns
C
L
= 10pF
Discharge Transistor
I
DL
.01
nA
Leakage Current
Discharge Voltage Drop
V
DISC
0.5
1.0
V
I
DISCHARGE
= 40mA
0.2
0.4
V
I
DISCHARGE
= 15mA
Maximum Frequency
R
A
= 470
Astable Mode
f
MAX
2
MHz
R
B
= 200
C
T
=100pF
Minimum Trigger Pulse Width
1
t
TRIG
50
100
ns
ABSOLUTE MAXIMUM RATINGS
Supply voltage, V
+
13.2V
Input voltage range
-0.3V to V+ +0.3V
Power dissipation
600 mW
Operating temperature range
PE, SE package
0
C to + 70
C
DE package
-55
C to +125
C
Storage temperature range
-65
C to +150
C
Lead temperature, 10 seconds
+260
C
Notes:
1
Sample tested parameters.
2
Consists of junction leakage currents with strong temperature dependence.
ALD4501
Advanced Linear Devices
9-3
TYPICAL PERFORMANCE CHARACTERISTICS
TIME DELAY IN THE MONOSTABLE MODE
AS A FUNCTION OF R
A
AND C
TIME DELAY
100ns 1
s
1ms
1s
10s
CAPACITANCE
1G
10M
100M
1M
100K
10K
1K
10 mF
100 nF
1 mF
100
F
10
F
1
F
10 nF
1 nF
100 pF
T
A
= 25
C
10
s 100
s
10ms 100ms
100s
R
A
FREE RUNNING FREQUENCY AS A
FUNCTION OF R
A,
R
B
AND C
FREQUENCY (Hz)
1.0
1K
10K 100K
10M 100M
1M
10 mF
100 nF
CAPACITANCE
100M
10M
1M
100K
10K
1K
1 mF
100
F
10
F
1
F
10 nF
1 nF
100 pF
10
0.1
100
T
A
= 25
C
( R
A
- 2R
B
)
FREQUENCY CHANGE IN THE ASTABLE MODE
AS A FUNCTION OF SUPPLY VOLTAGE
SUPPLY VOLTAGE (V)
0
2
4
6
12
10
8
+4
+3
+2
+1
0
-1
-2
-3
FREQUENCY CHANGE (%)
-4
DISCHARGE SINK CURRENT (mA)
DISCHARGE OUTPUT SINK CURRENT AS A
FUNCTION OF DISCHARGE LOW VOLTAGE
DISCHARGE LOW VOLTAGE (V)
0.01
0.02
0.05
0.1
1.0
0.5
0.2
100
50
20
5.0
2.0
1.0
0.5
0.2
0.1
10
T
A
= 25
C
V
+
= 12V
V
+
= 2V
V+ = 5V
0
10
20
30
40
MINIMUM PULSE WIDTH
REQUIRED FOR TRIGGERING
800
600
500
400
300
200
100
0
700
LOWEST VOLTAGE LEVEL OF TRIGGER
PULSE ( % V
+
)
MINIMUM PULSE WIDTH (ns)
T
A
= 25
C
V
+
= 2V
V
+
= 5V
V
+
= 12V
SUPPLY CURRENT AS A FUNCTION OF
SUPPLY VOLTAGE
300
180
150
120
90
60
30
0
210
240
270
T = - 40
C
A
T = + 20
C
A
T = + 85
C
A
0
2
4
6
8
10
12
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
A)
ALD4501
Advanced Linear Devices
9-4
TYPICAL PERFORMANCE CHARACTERISTICS
TYPICAL APPLICATIONS
Frequency f = 1.46/ ( R
A
+ 2R
B
) C
Duty Cycle DC = R
B
/ ( R
A
+ 2R
B
)
Timer 4 oscillates in free running mode
( 50 % Duty Cycle ) and drives the trigger
inputs of timers 1,2,3, each with indepen-
dently set time delays.
Pulse Delay td = 1.1R
C
QUAD ASTABLE MODE OPERATION
( FREE RUNNING OSCILLATOR )
QUAD MONOSTABLE MODE OPERATION
( ONE SHOT PULSE )
SYNCHRONIZED TIMING GENERATORS
OUTPUT SINK CURRENT (mA)
OUTPUT SINK CURRENT AS A FUNCTION
OF OUTPUT VOLTAGE
OUTPUT VOLTAGE (V)
0.01
0.02
0.05
0.1
1.0
0.5
0.2
100
50
20
5.0
2.0
1.0
0.5
0.2
0.1
10
T
A
= 25
C
V
+
= 2V
V
+
= 5V
V
+
= 12V
OUTPUT SOURCE CURRENT AS A
FUNCTION OF OUTPUT VOLTAGE
-1.0
-2.0
-5.0
-10
-20
-50
-100
-0.5
-0.5
-0.2
-0.1
-0.05
-0.02
-0.01
-0.2
-0.1
-1.0
OUTPUT VOLTAGE (V)
(REFERENCED TO V
+
)
OUTPUT SOURCE CURRENT (mA)
V+ = 2V
V+ = 12V
V+ = 5V
V+
INPUT 1
INPUT 2
INPUT 3
INPUT 4
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
DELAY 1
DELAY 4
DELAY 3
DELAY 2
R1
R2
R3
R4
C1
C2
C3
C4
V-
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
C2
C1
C3
C4
OUT1
OUT2
OUT3
OUT4
V+
V+
RA1
RB1
RA2
RB2
RA3
RB3
RA4
RB4
V-
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
R
OUT 3
OUT 2
OUT 1
C
C
C
C
R
R
R
V+
TIMER 1
TIMER 2
TIMER 3
TIMER 4
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