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DS1040
Programmable One-Shot Pulse Generator
FEATURESAll-silicon pulse width generatorFive programmable widthsEqual and unequal increments availablePulse widths from 5 ns to 500 nsWidths are stable and preciseRising edge-triggeredInverted and non-inverted outputsWidth tolerance �5% or �2 ns, whichever isgreaterEconomicalAuto-insertable, low profileLow-power CMOSTTL/CMOS-compatibleVapor phase, IR and wave solderableCustom widths availableFast turn prototypesExtended temperature range available
PIN ASSIGNMENT
PIN DESCRIPTIONIN – Trigger Input
P0-P2 – Programming Pins
GND – Ground
OUT – Pulse Output
OUT – Inverted Pulse Output
VCC – +5V
DESCRIPTIONThe 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-pinmini-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 outputsare 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.
DS1040
Programmable One-ShotDS1040Z 8-Pin SOIC (150-mil)
See Mech. Drawings Section
GND
DS1040
LOGIC DIAGRAM Figure 1
PULSE WIDTH VS. PROGRAMMED VALUE Table 1All times in nanoseconds.
DS1040
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 secondsShort 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 absolutemaximum rating conditions for extended periods of time may affect reliability.
DC ELECTRICAL CHARACTERISTICS(0°C to 70°C; VCC = 5.0V � 5%)
AC ELECTRICAL CHARACTERISTICS(TA = 25°C; VCC = 5.0V � 5%)
CAPACITANCE(TA = 25°C)
DS1040
NOTES:1. All voltages are referenced to ground.
2. Measured with outputs open, minimum period.
3. VCC = 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. ICC is a function of frequency and maximum width. Only a pulse generator operating with 40 nsperiod and VCC =5.25V will have an ICC =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
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 thefollowing trigger pulse.
tWIH , WIL , WO (Pulse Width): The elapsed time on the pulse between the 1.5V point on the leading edge
DS1040
tRISE (Input Rise Time): The elapsed time between the 20% and the 80% point on the leading edge ofthe input pulse.
tFALL (Input Fall Time): The elapsed time between the 80% and the 20% point on the trailing edge ofthe input pulse.
tD (Intrinsic Delay): The elapsed time between the 1.5 point on the leading edge of the input trigger
pulse and the 1.5V point on the leading edge of output pulse.
tPU (Power-up Time): After VCC is valid, the time required before timing specifications is withintolerance.
TEST SETUP DESCRIPTIONFigure 4 illustrates the hardware configuration used for measuring the timing parameters on the DS1040.
The input waveform is produced by a precision pulse generator under software control. The intrinsic
delay is measured by a time interval counter (20 ps resolution) connected between the input and each
output. Outputs are selected and connected to the counter by a VHF switch control unit. Widthmeasurements are made by directing both the start and stop functions of the counter to the same output.
All measurements are fully automated, with each instrument controlled by a central computer over an
IEEE 488 bus.
TEST CONDITIONS
Input:Ambient Temperature: 25�C + 3�C
Supply Voltage (VCC):5.0V + 0.1V
Input Pulse: High = 3.0V + 0.1VLow = 0.0V + 0.1
Source Impedance: 50 ohm max.
Rise and Fall Time: 3.0 ns max. (measuredbetween 0.6V and 2.4)
Pulse Width: 500 ns (1 �s for -500)
Period: 1 �s (2 �s for -500)
Output:The output is loaded with a 74F04. Delay is measured at the 1.5V level on the rising and falling edge.
Note:Above conditions are for test only and do not restrict the operation of the device under other data sheet
conditions.
