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DS1040 Programmable One-Shot Pulse Generator
www.dalsemi.com
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
IN OUT OUT GND 1 2 3 4 8 7 6 5 VCC P0 P1 P2
DS1040M 8-Pin DIP (300-mil) See Mech. Drawings Section IN OUT OUT GND 1 2 3 4 8 7 6 5 VCC P0 P1 P2
DS1040Z 8-Pin SOIC (150-mil) See Mech. Drawings Section
PIN DESCRIPTION
IN P0-P2 GND OUT
OUT
VCC
- 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
LOGIC DIAGRAM Figure 1
PULSE WIDTH VS. PROGRAMMED VALUE Table 1
PROGRAMMING PINS MSB P2 P1 LSB PART NUMBER DS1040-75 DS1040-100 DS1040-150 DS1040-200 DS1040-250 DS1040-500 DS1040-B50 DS1040-D60 DS1040-A15 DS1040-A20 DS1040-A32 DS1040-B40 DS1040-D70 75 100 150 200 250 500 50 60 15 20 32.5 40 70 15 20 30 40 50 100 30 20 5 10 22.5 20 30 30 40 60 80 100 200 35 30 7.5 12.5 25 25 40 45 60 90 120 150 300 40 40 10 15 27.5 30 50 60 80 120 160 200 400 45 50 12.5 17.5 30 35 60 75 100 150 200 250 500 50 60 15 20 32.5 40 70 75 100 150 200 250 500 50 60 15 20 32.5 40 70 75 100 150 200 250 500 50 60 15 20 32.5 40 70 P0 MAX WIDTH 0 0 0 MIN WIDTH 0 0 1 0 1 0 0 1 1 1 0 0 MAX WIDTH 1 0 1 MAX WIDTH 1 1 0 MAX WIDTH 1 1 1
All times in nanoseconds. Custom pulse widths available. 2 of 6
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 0C to 70C -55C to +125C 260C 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 VCC VIH VIL II ICC IOH IOL 0.0 VI VCC VCC = Max; Period = Min VCC = Min VOH = 4 VCC = Min VOL = 0.5 TEST MIN 4.75 2.2 -0.5 -1.0
(0C to 70C; VCC = 5.0V 5%)
TYP 5.00 MAX 5.25 VCC + 0.5 0.8 1.0 35 75 -1 8 UNITS V V V mA 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 tPS tPH tWIH tWIL tD tWO tPU Period tWO + 50 MIN 5 0 5 5 0 5
(TA = 25C; VCC = 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 CIN MIN TYP 5 MAX 10 pF
(TA = 25C)
UNITS NOTES
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NOTES:
1. All voltages are referenced to ground. 2. Measured with outputs open, minimum period. 3. VCC = 5V @ 25C. Width accurate to within 2 ns or 5%. 4. Temperature variations between 0C and 70C 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 0C and 70C 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 ns period 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
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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 the following trigger pulse. tWIH , 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. 5 of 6
DS1040
tRISE (Input Rise Time): The elapsed time between the 20% and the 80% point on the leading edge of the input pulse. tFALL (Input Fall Time): The elapsed time between the 80% and the 20% point on the trailing edge of the 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 within tolerance.
TEST SETUP DESCRIPTION
Figure 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. Width measurements 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: Supply Voltage (VCC): Input Pulse: Source Impedance: Rise and Fall Time: Pulse Width: Period: 25C + 3C 5.0V + 0.1V High = 3.0V + 0.1V Low = 0.0V + 0.1 50 ohm max. 3.0 ns max. (measured between 0.6V and 2.4) 500 ns (1 s for -500) 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.
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