PPG38F-100M datasheet(2/5 Pages) DATADELAY

Part #	PPG38F-100M

Description	8-BIT PROGRAMMABLE PULSE GENERATOR (SERIES PPG38F)

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Manufacturer	DATADELAY [Data Delay Devices, Inc.]

Direct Link	http://www.datadelay.com

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2 / 5 page

PPG38F

Doc #97007

DATA DELAY DEVICES, INC.

2

1/15/97

Tel: 201-773-2299

Fax: 201-773-9672

http://www.datadelay.com

APPLICATION NOTES

DEVICE TIMING

The timing definitions and restrictions for the

PPG38F 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 PPG38F is

unknown. Consequently, after power is applied,

the unit may not respond to input triggers for a

time equal to the maximum pulse width, PWT.

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 PPG38F 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.

`

TOAX

TRTS

TTW

TTO

PWA

A7-A0

RES

TRIG

OUT

OUT/

Figure 1: Timing Diagram

A i

Ai+1

TSKEW

TATS

TRO

TOTR

TTW

TRW

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PPG38F-100M Datasheet(PDF) 2 Page - Data Delay Devices, Inc.

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