6-BIT PROGRAMMABLE PULSE GENERATOR (SERIES PPG36F)
FEATURES
∙Digitally programmable in 64 steps
∙Monotonic pulse-width-vs-address variation
∙Rising edge triggered
∙Two separate outputs: inverting & non-inverting
∙Precise and stable pulse width
∙Input & outputs fully TTL interfaced & buffered
∙10 T2L fan-out capability
∙Fits standard 24-pin DIP socket
∙Auto-insertable
PPG36F
data 3 ® delay
devices, inc.
PACKAGES
TRIG |
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1 |
24 |
VCC |
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N/C |
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2 |
23 |
OUT/ |
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OUT |
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3 |
22 |
N/C |
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N/C |
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4 |
21 |
N/C |
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N/C |
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5 |
20 |
N/C |
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N/C |
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6 |
19 |
A0 |
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RES |
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7 |
18 |
A1 |
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N/C |
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8 |
17 |
A2 |
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N/C |
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9 |
16 |
N/C |
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N/C |
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10 |
15 |
A3 |
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N/C |
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11 |
14 |
A4 |
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GND |
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12 |
13 |
A5 |
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PPG36F-xx DIP |
PPG36F-xxM |
Military DIP |
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PPG36F-xxC4 Gull-Wing |
PPG36F-xxMC4 |
Military Gull-Wing |
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FUNCTIONAL DESCRIPTION |
PIN DESCRIPTIONS |
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The PPG36F-series device is a 6-bit digitally programmable pulse |
TRIG |
Trigger Input |
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generator. The width, PW A, depends on the address code (A5-A0) |
OUT |
Non-inverted Output |
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according to the following formula: |
OUT/ |
Inverted Output |
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PWA = PW 0 + TINC * A |
A0-A5 |
Address Bits |
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RES |
Reset |
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where A is the address code, TINC is the incremental pulse width of the |
VCC |
+5 Volts |
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GND |
Ground |
device, and PW 0 is the inherent pulse width of the device. The incremental
width is specified by the dash number of the device and can range from 0.5ns through 10ns, inclusively. RESET is held LOW during normal operation. When it is brought HIGH, OUT and OUT/ are forced into LOW and HIGH states, respectively, and the unit is ready for the next trigger input. The address is not latched and must remain asserted while the output pulse is active.
SERIES SPECIFICATIONS
∙Programmed pulse width tolerance: 5% or 2ns,
whichever is greater
∙Inherent width (PW0): 12ns typical
∙Inherent delay (TTO): 3.5ns ± 2ns
∙Operating temperature: 0° to 70° C
∙Supply voltage VCC: 5VDC ± 5%
∙Supply current: ICC = 60ma typical
©1997 Data Delay Devices
DASH NUMBER SPECIFICATIONS
Part |
Incremental Width |
Total Width |
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Number |
Per Step (ns) |
Change (ns) |
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PPG36F-.5 |
0.5 ± 0.3 |
31.5 ± 2.00 |
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PPG36F-1 |
1 |
± 0.5 |
63.0 ± 3.15 |
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PPG36F-2 |
2 |
± 0.5 |
126.0 ± 6.30 |
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PPG36F-3 |
3 |
± 1.0 |
189.0 ± 9.45 |
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PPG36F-4 |
4 |
± 1.0 |
252.0 ± 12.6 |
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PPG36F-5 |
5 |
± 1.5 |
315.0 ± 15.8 |
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PPG36F-6 |
6 |
± 1.5 |
378.0 ± 18.9 |
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PPG36F-7 |
7 |
± 1.5 |
441.0 ± 22.1 |
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PPG36F-8 |
8 |
± 2.0 |
504.0 ± 25.2 |
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PPG36F-9 |
9 |
± 2.0 |
567.0 ± 28.4 |
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PPG36F-10 |
10 |
± 2.0 |
630.0 ± 31.5 |
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NOTE: Any dash number between .5 and 10 not shown is also available.
Doc #97009 |
DATA DELAY DEVICES, INC. |
1 |
1/15/97 |
3 Mt. Prospect Ave. Clifton, NJ 07013 |
PPG36F
APPLICATION NOTES
DEVICE TIMING
The timing definitions and restrictions for the PPG36F are shown in Figure 1. The unit is activated by a rising edge on the TRIG input. After a time, TTO (called the inherent delay), the rising edge of the pulse appears at OUT. The duration of the pulse is given by the above equation. For the duration of the pulse, the device ignores subsequent triggers. Once the falling edge of the pulse has appeared at OUT, an additional time, TOTR, is required before the device can respond to the next trigger.
At power-up, the state of the PPG36F is unknown. Consequently, after power is applied, the unit may not respond to input triggers for a time equal to the maximum pulse width, PW T. After this time, the unit will function properly. If your application requires that the device function immediately, issue a quick reset at power-up.
POWER SUPPLY BYPASSING
The PPG36F relies on a stable power supply to produce repeatable pulses within the stated tolerances. A 0.1uf capacitor from VCC to GND, located as close as possible to each VCC pin, is recommended. A wide VCC trace should connect all VCC pins externally, and a clean ground plane should be used.
INCREMENT TOLERANCES
Please note that the increment tolerances listed represent a design goal. Although most increments will fall within tolerance, they are not guaranteed throughout the address range of the unit. Monotonicity is, however, guaranteed over all addresses.
`A5-A0 |
A i |
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Ai+1 |
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TRW |
TOAX |
TATS |
RES |
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TRTS |
TTW |
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TRIG |
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TTO |
TRO |
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OUT |
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TOTR |
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TSKEW |
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PWA |
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OUT/
Figure 1: Timing Diagram
Doc #97009 |
DATA DELAY DEVICES, INC. |
2 |
1/15/97 |
Tel: 973-773-2299 Fax: 973-773-9672 http://www.datadelay.com |