1 of 6
111799
FEATURES
All-silicon pulse width generator
Five programmable widths
Equal and unequal increments available
Pulse widths from 5 ns to 500 ns
Widths are stable and precise
Rising edge-triggered
Inverted and non-inverted outputs
Width tolerance
±
5% or
±
2 ns, whichever is
greater
Economical
Auto-insertable, low profile
Low-power CMOS
TTL/CMOS-compatible
Vapor phase, IR and wave solderable
Custom widths available
Fast turn prototypes
Extended temperature range available
PIN ASSIGNMENT
PIN DESCRIPTION
IN
Trigger
Input
P0-P2
Programming Pins
GND
Ground
OUT
Pulse Output
OUT
Inverted Pulse Output
V
CC
+5V
DESCRIPTION
The DS1040 Pulse Generator is a user-programmable one-shot with a choice of five precise pulse widths.
Maximum widths range from 50 ns to 500 ns; increments range from 2.5 ns to 100 ns. For maximum
flexibility in applications such as magneto-optical read/write disk laser power control, varieties are
offered with equal and unequal increments. The DS1040 is offered in standard 8-pin DIPs and 8-pin
mini-SOICs. Low cost and superior reliability over hybrid technology are achieved by the combination
of a 100% CMOS silicon design and industry standard packaging. The DS1040 series of pulse generators
provide a nominal width accuracy of
±
5% or
±
2 ns, whichever is greater. In response to the rising edge
of the input (trigger) pulse, the DS1040 produces an output pulse with a width determined by the logic
states of the three parallel programming pins. For convenience, both inverting and non-inverting outputs
are supplied. The intrinsic delay between the trigger pulse and the output pulse is no more than 10 ns.
Each output is capable of driving up to five 74LS loads.
Dallas Semiconductor can customize standard products to meet special needs. For special request and
rapid delivery, call (972) 3714348.
DS1040
Programmable One-Shot
Pulse Generator
www.dalsemi.com
DS1040Z 8-Pin SOIC (150-mil)
See Mech. Drawings Section
IN
OUT
OUT
GND
V
CC
P2
P0
P1
1
2
3
4
8
7
6
5
DS1040M 8-Pin DIP (300-mil)
See Mech. Drawings Section
V
CC
P2
P0
P1
IN
OUT
OUT
GND
1
2
3
4
8
7
6
5
DS1040
2 of 6
LOGIC DIAGRAM Figure 1
PULSE WIDTH VS. PROGRAMMED VALUE Table 1
PROGRAMMING
PINS
MAX
WIDTH
MIN
WIDTH
MAX
WIDTH
MAX
WIDTH
MAX
WIDTH
MSB P2
0
0
0
0
1
1
1
1
P1
0
0
1
1
0
0
1
1
LSB P0
0
1
0
1
0
1
0
1
PART
NUMBER
DS1040-75
75
15
30
45
60
75
75
75
DS1040-100
100
20
40
60
80
100
100
100
DS1040-150
150
30
60
90
120
150
150
150
DS1040-200
200
40
80
120
160
200
200
200
DS1040-250
250
50
100
150
200
250
250
250
DS1040-500
500
100
200
300
400
500
500
500
DS1040-B50
50
30
35
40
45
50
50
50
DS1040-D60
60
20
30
40
50
60
60
60
DS1040-A15
15
5
7.5
10
12.5
15
15
15
DS1040-A20
20
10
12.5
15
17.5
20
20
20
DS1040-A32
32.5
22.5
25
27.5
30
32.5
32.5
32.5
DS1040-B40
40
20
25
30
35
40
40
40
DS1040-D70
70
30
40
50
60
70
70
70
All times in nanoseconds.
Custom pulse widths available.
DS1040
3 of 6
ABSOLUTE MAXIMUM RATINGS*
Voltage on any Pin Relative to Ground
-1.0V to +7.0V
Operating Temperature
0
°
C to 70
°
C
Storage Temperature
-55
°
C to +125
°
C
Soldering Temperature
260
°
C for 10 seconds
Short Circuit Output Current
50 mA for 1 second
* This is a stress rating only and functional operation of the device at these or any other conditions above
those indicated in the operation sections of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods of time may affect reliability.
DC ELECTRICAL CHARACTERISTICS
(0°C to 70°C; V
CC
= 5.0V
±
5%)
PARAMETER
SYMBOL
TEST
MIN
TYP
MAX
UNITS NOTES
Supply Voltage
V
CC
4.75
5.00
5.25
V
1
High Level Input
Voltage
V
IH
2.2
V
CC
+ 0.5
V
1
Low Level Input
Voltage
V
IL
-0.5
0.8
V
1
Input Leakage
Current
I
I
0.0 V
I
V
CC
-1.0
1.0
mA
Active Current
I
CC
V
CC
= Max;
Period = Min
35
75
mA
2, 6
High Level Output
Current
I
OH
V
CC
= Min
V
OH
= 4
-1
mA
Low Level Output
Current
I
OL
V
CC
= Min
V
OL
= 0.5
8
mA
AC ELECTRICAL CHARACTERISTICS
(T
A
= 25°C; V
CC
= 5.0V
±
5%)
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
NOTES
Programming Setup
t
PS
5
ns
Programming Hold
t
PH
0
ns
Input Pulse Width at Logic 1
t
WIH
5
ns
Input Pulse Width at Logic 0
t
WIL
5
ns
Intrinsic Delay
t
D
0
5
10
ns
Output Pulse Width
t
WO
Table 1
ns
3, 4, 5, 7
Power-up Time
t
PU
100
ms
Period
Period
t
WO
+ 50
ns
CAPACITANCE
(T
A
= 25°C)
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
NOTES
Input Capacitance
C
IN
5
10
pF
DS1040
4 of 6
NOTES:
1.
All voltages are referenced to ground.
2.
Measured with outputs open, minimum period.
3.
V
CC
= 5V @ 25
°
C. Width accurate to within
±
2 ns or 5%.
4.
Temperature variations between 0
°
C and 70
°
C may increase or decrease width by an additional
±
1 ns
or
±
3%, whichever is greater.
5.
For DS1040 pulse generators with maximum widths less than 50 ns, temperature variations between
0
°
C and 70
°
C may increase or decrease width by
±
1 ns or
±
9%, whichever is greater.
6.
I
CC
is a function of frequency and maximum width. Only a pulse generator operating with 40 ns
period and V
CC
=5.25V will have an I
CC
=75 mA. For example, a -100 will never exceed 30 mA, etc.
7.
See "Test Conditions" sections at the end of this data sheet.
TIMING DIAGRAM Figure 2
DS1040
5 of 6
POWER-UP TIMING DIAGRAM Figure 3
TEST CIRCUIT Figure 4
TERMINOLOGY
Period:
The time elapsed between the leading edge of the first trigger pulse and the leading edge of the
following trigger pulse.
t
WIH , WIL , WO
(Pulse Width): The elapsed time on the pulse between the 1.5V point on the leading edge
and the 1.5V point on the trailing edge, or the 1.5V point on the trailing edge and the 1.5V point on the
leading edge.
PDF 
ZIP