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Part: ALD555
Category:
Analog & Mixed-Signal Processing
Description: Single High Speed CMOS Timer
Company: Advanced Linear Devices
Datasheet: Download ALD555 datasheet File size : 445 kB
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ADVANCED LINEAR DEVICES, INC.
ALD555 HIGH SPEED CMOS TIMER
GENERAL DESCRIPTION The ALD555 timer is a high performance 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; reduced supply current spikes, allowing smaller and lower cost decoupling capacitors. It 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 respectively of V +. These levels can be adjusted by using the control terminal (pin 5). When the trigger input is below the trigger level, the output is in the high state and sourcing 2mA. When 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 · Functional equivalent to NE555 with greatly expanded high and low frequency ranges · High speed, low power, monolithic CMOS technology · Low supply current 100µA typical · Extremely low trigger, threshold and reset currents -- 1pA typical · High speed operation -- 2MHz oscillation · Low operating supply voltage 2 to 12V · Operates in both monostable and astable modes · Fixed 50% duty cycle or adjustable duty cycle CMOS, NMOS and TTL compatible input/output · High discharge sinking current (80mA) · 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 ALD555 DA 8-Pin Small Outline Package (SOIC) ALD555 SA 8-Pin Plastic Dip Package ALD555 PA
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
PIN CONFIGURATION
GROUND TRIGGER OUTPUT RESET
1 2 3 4
8 7 6 5
V+ DISCHARGE THRESHOLD CONTROL
TOP VIEW DA, PA, SA PACKAGE
BLOCK DIAGRAM
V+ (8)
RESET (4)
THRESHOLD (6) CONTROL (5) R R S DISCHARGE (7) R OUTPUT (3)
TRIGGER (2) 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 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
PA,SA package DA package
OPERATING ELECTRICAL CHARACTERISTICS TA = 25 oC V + = +5V unless otherwise specified
Parameter Supply Voltage Supply Current Timing error / Astable mode Initial Accuracy Drift with Temperature 1 Drift with Supply Voltage 1 Threshold Voltage Trigger Voltage Trigger Current 2 Reset Voltage Reset Current 2 Threshold Current 2 Control Voltage Level Output Voltage Drop (Low) Output Voltage Drop (High) Rise Time of Output 1 Fall Time of Output 1 Discharge Transistor Leakage Current Discharge Voltage Drop
Symbol
V+ IS
Min
2
Typ
Max
12
Unit
V µA
Test Conditions
100
180
Outputs Unloaded
terr t/T t/V+ VTH VTRIG ITRIG VRST IRST ITH VCONT VOL VOH tr tf IDL 3.273 0.4 3.273 1.607
1.0 10.0 0.1 3.333 1.667 .001 0.7 .001 .001 3.333 0.2
2.2
% ppm/°C %/V
C = 0.1µF RA = 1K RB = 1K
3.393 1.737 0.2 1.0 0.2 0.2 3.393 0.4 4.2
V V nA V nA nA V V V ns ns nA ISINK = 10mA ISOURCE = -2mA RL = 10M CL = 10pF
15 10 .01
30 20
VDIS C
0.5 0.2
1.0 0.4
V V
I DISCHARGE = 80mA I DISCHARGE = 30mA RA = 470 RB = 200 CT = 200pF
Maximum Frequency Astable Mode
1 2
fMAX
1.4
2
MHz
Notes:
Sample tested parameters. Consists of junction leakage currents with strong temperature dependence.
ALD555
Advanced Linear Devices
9-2
TYPICAL PERFORMANCE CHARACTERISTICS
DISCHARGE OUTPUT SINK CURRENT AS A FUNCTION OF DISCHARGE LOW VOLTAGE
DISCHARGE SINK CURRENT (mA)
100
MINIMUM PULSE WIDTH REQUIRED FOR TRIGGERING
800
MINIMUM PULSE WIDTH (ns)
50 20 10 5.0 2.0 1.0 0.5 0.2 0.1 0.01
TA = 25°C
V+ = 12V
V+ = 5V V+ = 2V
700 600 500 400 300 200 100 0 0
TA = 25°C
V+ = 2V V+ = 5V V+= 12V
0.02
0.05
0.1
0.2
0.5
1.0
DISCHARGE LOW VOLTAGE (V)
10
20
30
40
LOWEST VOLTAGE LEVEL OF TRIGGER PULSE ( % V+)
FREE RUNNING FREQUENCY AS A FUNCTION OF RA, RB AND C
10 mF
FREQUENCY CHANGE IN THE ASTABLE MODE AS A FUNCTION OF SUPPLY VOLTAGE
+4
100 µF
( RA - 2RB )
FREQUENCY CHANGE (%)
1 mF
TA = 25°C
+3 +2 +1 0 -1 -2 -3 -4
CAPACITANCE
10 µF 1 µF 100 nF 10 nF 1 nF 100 pF 0.1 1.0 10 100 1K 10K 100K 1M 10M 100M FREQUENCY (Hz)
10
10
0M
1M
10
10
0K
1K
K
M
0
2
4
6
8
10
12
SUPPLY VOLTAGE (V)
TIME DELAY IN THE MONOSTABLE MODE AS A FUNCTION OF RA AND C
10 mF 1 mF 100 µF
SUPPLY CURRENT AS A FUNCTION OF SUPPLY VOLTAGE
200 180
TA = 25°C
RA
SUPPLY CURRENT (uA)
160 140 120 100 80 60 40 20 0
CAPACITANCE
1K K 0K
10 µF 1 µF 100 nF 10 nF 1 nF 100 pF
TA = - 40°C TA = + 20°C TA = + 85°C
10
10
100ns 1µs 10µs 100µs 1ms 10ms 100ms 1s
M 0M
1G
1M
10
10
10s
100s
0
2
4
6
8
10
12
TIME DELAY
SUPPLY VOLTAGE (V)
ALD555
Advanced Linear Devices
9-3
TYPICAL PERFORMANCE CHARACTERISTICS
OUTPUT SINK CURRENT AS A FUNCTION OF OUTPUT VOLTAGE
50 20 10 5.0 2.0 1.0 0.5 0.2 0.1 0.01 0.02 0.05 0.1 0.2 0.5 1.0 OUTPUT VOLTAGE (V) V+ = 2V TA = 25°C V+ = 12V
OUTPUT SOURCE CURRENT (mA)
OUTPUT SOURCE CURRENT AS A FUNCTION OF OUTPUT VOLTAGE
-0.1 -0.2 0.5 -1.0 -2.0 -5.0 -10 -20 -50 -- 00 1 -1.0 -0.5 -0.2 -0.1 -0.05 -0.02 -0.01 V+ = 2V V+ = 5V V+ = 12V
100
OUTPUT SINK CURRENT (mA)
V+ = 5V
OUTPUT VOLTAGE (V) (RE FERENCED TO V+)
TYPICAL APPLICATIONS
ASTABLE MODE OPERATION 50% DUTY CYCLE
V+
ASTABLE MODE OPERATION (FREE RUNNING OSCILLATOR)
V+
1 2 R 3 V+ 4
8 0.1µF 7 6 C 5
1 2 3 V+ 4
8 RA 7 RB 6 C 5 0.1µF
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+
1 TRIGGER INPUT DELAYED PULSE OUTPUT RESET 2 3 4
8 R 7 6 C 5
0.1µF
ALD555
Advanced Linear Devices
9-4
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