ALD ALD2502DB Single/dual precision high speed micropower timer Datasheet

ADVANCED
LINEAR
DEVICES, INC.
ALD1502/ALD2502
SINGLE/DUAL PRECISION HIGH SPEED MICROPOWER TIMER
GENERAL DESCRIPTION
APPLICATIONS
The ALD1502/ALD2502 timers are high performance single/dual monolithic 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.
• High speed one-shot (monostable)
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.
pulse generation
Precision timing
Sequential timing
Long delay timer
Pulse width and pulse position
modulation
• Missing pulse detector
• Frequency divider
• Synchronized timer
•
•
•
•
PIN CONFIGURATION
There are three matched internal resistors (approximately 200KΩ each)
that set the threshold and trigger levels at two-thirds and one-third respectively 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.
GND
•
•
•
•
•
•
•
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
8
TRIG
2
7
DISC
OUT
3
6
THRES
RST
4
5
CONT
TOP VIEW
DA, PA, SA PACKAGE
FEATURES
•
•
•
•
V+
1
DSC1
1
14
V+
THRES1
2
13
DSC2
CONT1
3
12
THRES2
RST1
4
11
CONT2
OUT1
5
10
RST2
TRIG1
6
9
OUT2
GND
7
8
TRIG2
TOP VIEW
DB, PB, SB PACKAGE
BLOCK DIAGRAM (EACH TIMER)
V+
(8)
ORDERING INFORMATION
-55°C to +125°C
RESET
(4)
Operating Temperature Range *
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
THRESHOLD
(6)
CONTROL
(5)
R
R
OUTPUT
(3)
R
S
TRIGGER
(2)
DISCHARGE
(7)
R
GND
(1)
* Contact factory for industrial temperature range
© 1998 Advanced Linear Devices, Inc. 415 Tasman Drive, Sunnyvale, California 94089 -1706 Tel: (408) 747-1155 Fax: (408) 747-1286 http://www.aldinc.com
ABSOLUTE MAXIMUM RATINGS
Supply voltage, V+
Input voltage range
Power dissipation
Operating temperature range
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
PA, PB, SA, SB package
DA, DB package
Storage temperature range
Lead temperature, 10 seconds
OPERATING ELECTRICAL CHARACTERISTICS
TA = 25oC V+ = +5V unless otherwise specified
Parameter
Symbol
Supply Voltage
V+
Supply Current ALD1502
Supply Current ALD2502
IS
IS
Timing error / Astable mode
Initial Accuracy
terr
Drift with Temperature 1
Drift with Supply Voltage 1
∆t/∆T
∆t/∆V+
Threshold Voltage
VTH
3.233
3.333
3.433
V
Trigger Voltage
VTRIG
1.567
1.667
1.767
V
Trigger Current 2
ITRIG
.01
0.4
nA
Reset Voltage
VRST
0.7
1.0
V
Reset Current 2
IRST
.01
0.4
nA
Threshold Current 2
ITH
.01
0.4
nA
Control Voltage Level
VCONT
3.333
3.433
V
Output Voltage Drop (Low)
VOL
0.2
0.4
V
ISINK = 10mA
Output Voltage Drop (High)
VOH
V
ISOURCE = -2mA
Rise Time of Output 1
tr
10
20
ns
RL = 10MΩ
Fall Time of Output 1
tf
10
20
ns
CL = 10pF
Discharge Transistor
Leakage Current
IDL
.01
Discharge Voltage Drop
VDISC
0.5
0.2
Maximum Frequency
Astable Mode
fMAX
Minimum Trigger Pulse Width1
tTRIG
Notes:
1
2
ALD1502/ALD2502
Min
Typ
Max
2
3.233
4.2
1.5
Test Conditions
12
V
50
100
90
180
µA
µA
Outputs Unloaded
1.0
2.2
%
C = 0.1µF
ppm/°C
%/V
RA = 1KΩ
RB = 1KΩ
10.0
0.2
0.4
Unit
4.6
nA
1.0
0.4
2.5
50
100
V
V
I DISCHARGE = 80mA
I DISCHARGE = 30mA
MHz
RA = 470Ω
RB = 200Ω
CT =100pF
ns
Sample tested parameters.
Consists of junction leakage currents with strong temperature dependence.
Advanced Linear Devices
2
TYPICAL PERFORMANCE CHARACTERISTICS
MINIMUM PULSE WIDTH
REQUIRED FOR TRIGGERING
100
50
800
V+ = 12V
TA = 25°C
MINIMUM PULSE WIDTH (ns)
DISCHARGE SINK CURRENT (mA)
DISCHARGE OUTPUT SINK CURRENT AS A
FUNCTION OF DISCHARGE LOW VOLTAGE
V+ = 5V
20
V+ = 2V
10
5.0
2.0
1.0
0.5
0.2
0.1
0.01
700
TA = 25°C
600
500
V+ = 2V
400
V+= 5V
300
V+ =12V
200
100
0
0.02
0.05
0.1
0.2
0.5
1.0
( RA- 2RB)
10 µF
1 µF
10
KΩ
Ω
1M 0KΩ
Ω
M
Ω
100 nF
10 nF
10
1K
10
10
0M
Ω
1 nF
FREQUENCY CHANGE (%)
TA = 25°C
100 µF
CAPACITANCE
40
+4
1 mF
100 pF
+3
+2
+1
0
-1
-2
-3
-4
0
1.0 10 100 1K 10K 100K 1M 10M 100M
2
FREQUENCY (Hz)
4
6
8
10
12
SUPPLY VOLTAGE (V)
SUPPLY CURRENT AS A FUNCTION OF
SUPPLY VOLTAGE
TIME DELAY IN THE MONOSTABLE MODE
AS A FUNCTION OF RA AND C
10 mF
SUPPLY CURRENT (µA)
100
TA = 25°C
RA
10 µF
1 µF
100 nF
10 nF
1 nF
1K
10 Ω
10 KΩ
0K
Ω
100 µF
CAPACITANCE
30
FREQUENCY CHANGE IN THE ASTABLE
MODE AS A FUNCTION OF SUPPLY VOLTAGE
10 mF
1 mF
20
LOWEST VOLTAGE LEVEL OF TRIGGER
PULSE ( % VDD )
FREE RUNNING FREQUENCY AS
A FUNCTION OF RA, RB AND C
0.1
10
0
DISCHARGE LOW VOLTAGE (V)
Ω
1M MΩ Ω
10 0M
10 Ω
1G
90
80
70
TA = - 40°C
60
TA = + 20°C
50
TA = + 85°C
40
30
20
10
100 pF
0
100ns 1µs 10µs 100µs 1ms 10ms 100ms 1s 10s 100s
ALD1502/ALD2502
TIME DELAY
0
2
4
6
8
10
12
SUPPLY VOLTAGE (V)
Advanced Linear Devices
3
OUTPUT SINK CURRENT AS A
FUNCTION OF OUTPUT VOLTAGE
OUTPUT SINK CURRENT (mA)
100
50
TA = 25°C
V+ = 5V
V+ = 12V
20
10
5.0
V+ = 2V
2.0
1.0
0.5
0.2
OUTPUT SOURCE CURRENT (mA)
TYPICAL PERFORMANCE CHARACTERISTICS
OUTPUT SOURCE CURRENT AS A
FUNCTION OF OUTPUT VOLTAGE
-0.1
V+ = 2V
V+ = 5V
V+ = 12V
-0.2
-0.5
-1.0
-2.0
-5.0
-10
-20
-50
-100
0.1
0.01
0.02
0.05
0.1
0.2
0.5
-1.0
1.0
-0.5
-0.2
-0.1
-0.05
-0.02
-0.01
OUTPUT VOLTAGE (V)
(REFERENCED TO V+)
OUTPUT VOLTAGE (V)
TYPICAL APPLICATIONS ( EACH TIMER )
ASTABLE MODE OPERATION
(FREE RUNNING OSCILLATOR)
ASTABLE MODE OPERATION
50% DUTY CYCLE
V+
1
V+
8
1
8
2
7
RA
0.1µF
2
7
0.1µF
RB
R
3
6
4
5
V+
3
6
4
5
V+
C
Frequency f = 1/ (1.4 RC)
C
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+
1
8
R
TRIGGER
INPUT
DELAYED PULSE
OUTPUT
2
7
3
6
4
5
0.1µF
C
RESET
ALD1502/ALD2502
Advanced Linear Devices
4
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