www.dalsemi.com
DS1040
Programmable One-Shot
Pulse Generator
PIN ASSIGNMENT
IN
OUT
OUT
GND
1
2
3
4
8
7
6
5
V
CC
P0
P1
P2
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
DS1040M 8-Pin DIP (300-mil)
See Mech. Drawings Section
IN
OUT
OUT
GND
1
2
3
4
8
7
6
5
V
CC
P0
P1
P2
§
§
§
§
§
§
§
§
DS1040Z 8-Pin SOIC (150-mil)
See Mech. Drawings Section
PIN DESCRIPTION
IN
P0-P2
GND
OUT
OUT
V
CC
– Trigger Input
– Programming Pins
– Ground
– Pulse Output
– Inverted Pulse Output
– +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) 371–4348.
1 of 6
111799
DS1040
ABSOLUTE MAXIMUM RATINGS*
Voltage on any Pin Relative to Ground
Operating Temperature
Storage Temperature
Soldering Temperature
Short Circuit Output Current
-1.0V to +7.0V
0°C to 70°C
-55°C to +125°C
260°C for 10 seconds
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
PARAMETER
Supply Voltage
High Level Input
Voltage
Low Level Input
Voltage
Input Leakage
Current
Active Current
High Level Output
Current
Low Level Output
Current
SYMBOL
V
CC
V
IH
V
IL
I
I
I
CC
I
OH
I
OL
0.0
≤
V
I
≤V
CC
V
CC
= Max;
Period = Min
V
CC
= Min
V
OH
= 4
V
CC
= Min
V
OL
= 0.5
TEST
MIN
4.75
2.2
-0.5
-1.0
(0°C to 70°C; V
CC
= 5.0V
±
5%)
TYP
5.00
MAX
5.25
V
CC
+ 0.5
0.8
1.0
35
75
-1
8
UNITS
V
V
V
µA
mA
mA
mA
2, 6
NOTES
1
1
1
AC ELECTRICAL CHARACTERISTICS
PARAMETER
Programming Setup
Programming Hold
Input Pulse Width at Logic 1
Input Pulse Width at Logic 0
Intrinsic Delay
Output Pulse Width
Power-up Time
Period
SYMBOL
t
PS
t
PH
t
WIH
t
WIL
t
D
t
WO
t
PU
Period
t
WO
+ 50
MIN
5
0
5
5
0
5
(T
A
= 25°C; V
CC
= 5.0V
±
5%)
TYP
MAX
UNITS
ns
ns
ns
ns
10
100
ns
ns
ms
ns
3, 4, 5, 7
Table 1
NOTES
CAPACITANCE
PARAMETER
Input Capacitance
SYMBOL
C
IN
MIN
TYP
5
MAX
10
pF
(T
A
= 25°C)
UNITS
NOTES
3 of 6
DS1040
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
4 of 6
PCB Design
京公网安备 11010802033920号
EEWORLD
