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ADVANCED
LINEAR
DEVICES, INC.
ALD1502/ALD2502
SINGLE/DUAL PRECISION HIGH SPEED MICROPOWER TIMER
GENERAL DESCRIPTION
The ALD1502/ALD2502 timers are high performance single/dual mono-
lithic timing circuits built with advanced silicon gate CMOS technology.
They offer the benefits of high input impedance, thereby allowing smaller
timing capacitors and a longer timing cycle; high speed, with typical cycle
time of 400ns; low power dissipation for battery operated environment;
reduced supply current spikes, allowing smaller and lower cost decoupling
capacitors.
Each timer is capable of producing accurate time delays and oscillations in
both monostable and astable operation, and 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 200Keach)
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.
FEATURES
• High speed operation -- 2.5MHz typical oscillation at 5V
• High discharge sinking current of 80mA at 5V
• Guaranteed low operating supply voltage of 2V to 12V
• Functional equivalent to and same pin-out as NE555/NE556
with greatly expanded high and low frequency ranges
• High speed, low power, monolithic CMOS technology
• Low supply current 50µA typical for ALD1502
and100µA typical for ALD2502
• 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
ORDERING INFORMATION
Operating Temperature Range *
-55°C to +125°C
0°C to +70°C
0°C to +70°C
8-Pin
CERDIP Package
ALD1502 DA
8-Pin Small Outline
Package (SOIC)
ALD1502 SA
8-Pin Plastic Dip
Package
ALD1502PA
14-Pin
CERDIP Package
ALD2502 DB
14-Pin Small Outline 14-Pin Plastic Dip
Package (SOIC)
Package
ALD2502 SB
ALD2502 PB
* Contact factory for industrial temperature range
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
PIN CONFIGURATION
GND 1
8 V+
TRIG 2
7 DISC
OUT 3
6 THRES
RST 4
5 CONT
TOP VIEW
DA, PA, SA PACKAGE
DSC1 1
THRES1 2
CONT1 3
RST1 4
OUT1 5
TRIG1 6
GND 7
14 V+
13 DSC2
12 THRES2
11 CONT2
10 RST2
9 OUT2
8 TRIG2
TOP VIEW
DB, PB, SB PACKAGE
BLOCK DIAGRAM (EACH TIMER)
V+
(8)
THRESHOLD
(6)
CONTROL
(5)
R
R
TRIGGER
(2)
R
RESET
(4)
R
S
OUTPUT
(3)
DISCHARGE
(7)
GND
(1)
© 1998 Advanced Linear Devices, Inc. 415 Tasman Drive, Sunnyvale, California 94089 -1706 Tel: (408) 747-1155 Fax: (408) 747-1286 http://www.aldinc.com

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ABSOLUTE MAXIMUM RATINGS
Supply voltage, V+
Input voltage range
Power dissipation
Operating temperature range PA, PB, SA, SB package
DA, DB package
Storage temperature range
Lead temperature, 10 seconds
13.2V
-0.3V to V+ +0.3V
600 mW
0°C to + 70°C
-55°C to +125°C
-65°C to +150°C
+260°C
OPERATING ELECTRICAL CHARACTERISTICS
TA = 25oC V+ = +5V unless otherwise specified
Parameter
Symbol Min Typ
Max
Unit Test Conditions
Supply Voltage
V+ 2
12 V
Supply Current ALD1502
Supply Current ALD2502
Timing error / Astable mode
Initial Accuracy
IS
IS
terr
50 90 µA Outputs Unloaded
100 180
µA
1.0 2.2 % C = 0.1µF
Drift with Temperature 1
Drift with Supply Voltage 1
t/T
t/V+
10.0
0.2
ppm/°C
%/V
RA = 1K
RB = 1K
Threshold Voltage
Trigger Voltage
Trigger Current 2
Reset Voltage
Reset Current 2
VTH
VTRIG
ITRIG
VRST
IRST
3.233
1.567
0.4
3.333
1.667
.01
0.7
.01
3.433
1.767
0.4
1.0
0.4
V
V
nA
V
nA
Threshold Current 2
ITH
.01 0.4
nA
Control Voltage Level
VCONT
3.233
3.333 3.433
V
Output Voltage Drop (Low)
VOL
0.2 0.4
V
ISINK = 10mA
Output Voltage Drop (High)
VOH
4.2 4.6
V ISOURCE = -2mA
Rise Time of Output 1
tr
10 20
ns
RL = 10M
Fall Time of Output 1
tf
10 20
ns
CL = 10pF
Discharge Transistor
Leakage Current
IDL
.01 nA
Discharge Voltage Drop
VDISC
Maximum Frequency
Astable Mode
fMAX
Minimum Trigger Pulse Width1
tTRIG
0.5 1.0
0.2 0.4
1.5 2.5
50 100
V
V
MHz
ns
I DISCHARGE = 80mA
I DISCHARGE = 30mA
RA = 470
RB = 200
CT =100pF
Notes: 1 Sample tested parameters.
2 Consists of junction leakage currents with strong temperature dependence.
ALD1502/ALD2502
Advanced Linear Devices
2

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TYPICAL PERFORMANCE CHARACTERISTICS
DISCHARGE OUTPUT SINK CURRENT AS A
FUNCTION OF DISCHARGE LOW VOLTAGE
100
50 TA = 25°C
V+ = 12V
V+ = 5V
20
10 V+ = 2V
5.0
2.0
1.0
0.5
0.2
0.1
0.01
0.02 0.05 0.1 0.2
0.5
DISCHARGE LOW VOLTAGE (V)
1.0
MINIMUM PULSE WIDTH
REQUIRED FOR TRIGGERING
800
700 TA = 25°C
600
500
V+ = 2V
400
V+= 5V
300 V+ =12V
200
100
0
0 10 20
30 40
LOWEST VOLTAGE LEVEL OF TRIGGER
PULSE ( % VDD )
10 mF
FREE RUNNING FREQUENCY AS
A FUNCTION OF RA, RB AND C
1 mF
100 µF
( RA- 2RB)
TA = 25°C
10 µF
1 µF
100 nF
10 nF
1 nF
100 pF
1001M0M1M1001K0K1K
0.1 1.0 10 100 1K 10K 100K 1M 10M 100M
FREQUENCY (Hz)
FREQUENCY CHANGE IN THE ASTABLE
MODE AS A FUNCTION OF SUPPLY VOLTAGE
+4
+3
+2
+1
0
-1
-2
-3
-4
02
46
8 10 12
SUPPLY VOLTAGE (V)
TIME DELAY IN THE MONOSTABLE MODE
AS A FUNCTION OF RA AND C
10 mF
SUPPLY CURRENT AS A FUNCTION OF
SUPPLY VOLTAGE
100
1 mF
100 µF
10 µF
1 µF
100 nF
10 nF
1 nF
100 pF
TA = 25°C
RA
1M10M1001MGΩΩ
90
80
70
60
50
40
30
20
10
0
TA = - 40°C
TA = + 20°C
TA = + 85°C
100ns 1µs 10µs 100µs 1ms 10ms 100ms 1s 10s 100s
0
ALD1502/ALD2502
TIME DELAY
Advanced Linear Devices
24 6 8
SUPPLY VOLTAGE (V)
10
12
3

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TYPICAL PERFORMANCE CHARACTERISTICS
OUTPUT SINK CURRENT AS A
FUNCTION OF OUTPUT VOLTAGE
100
50 TA = 25°C
V+ = 5V
20 V+ = 12V
10
5.0 V+ = 2V
2.0
1.0
0.5
0.2
0.1
0.01
0.02
0.05 0.1 0.2
OUTPUT VOLTAGE (V)
0.5
1.0
OUTPUT SOURCE CURRENT AS A
FUNCTION OF OUTPUT VOLTAGE
-0.1
-0.2
V+ = 2V
V+ = 5V
-0.5 V+ = 12V
-1.0
-2.0
-5.0
-10
-20
-50
-100
-1.0 -0.5 -0.2 -0.1 -0.05 -0.02 -0.01
OUTPUT VOLTAGE (V)
(REFERENCED TO V+)
TYPICAL APPLICATIONS ( EACH TIMER )
ASTABLE MODE OPERATION
50% DUTY CYCLE
V+
1
2
R
3
V+
4
8
7
6
5
0.1µF
C
ASTABLE MODE OPERATION
(FREE RUNNING OSCILLATOR)
V+
1
2
3
V+
4
8
RA
7
RB
6
5
0.1µF
C
Frequency f = 1/ (1.4 RC)
Frequency f = 1.46 / (RA + 2RB)C
Duty Cycle DC = RB / (RA + 2RB)
MONOSTABLE MODE OPERATION (ONE SHOT PULSE)
Pulse Delay td = 1.1 RC
V+
TRIGGER
INPUT
DELAYED PULSE
OUTPUT
RESET
1
2
3
4
8 0.1µF
R
7
6
C
5
ALD1502/ALD2502
Advanced Linear Devices
4