DM9602N datasheet(4/8 Pages) NSC

4 / 8 page

Operating Rules (Continued)

B Use with high inverse leakage current electrolytic ca-

pacitors

The diode in this configuration prevents high inverse

leakage currents through the capacitor by preventing

an inverse voltage across the capacitor The use of

this configuration is not recommended with retriggera-

ble operation

03 RCX

TLF6611 – 5

C Use to obtain extended pulse widths

This configuration can be used to obtain extended

pulse widths because of the larger timing resistor al-

lowed by beta multiplication Electrolytics with high in-

verse leakage currents can be used

R k RX (07) (hFE Q1) or k 25 MX whichever is the

lesser

RX (min) k RY k RX (max)

(5 kX s RY s 10 kX is recommended)

Q1 NPN silicon transistor with hFE requirements of

above equations such as 2N5961 or 2N5962

03 RCX

TLF6611 – 6

This configuration is not recommended with retriggera-

ble operation

5 To obtain variable pulse width by remote trimming the

following circuit is recommended

TLF6611 – 7

6 Under any operating condition CX and RX (min) must be

kept as close to the circuit as possible to minimize stray

capacitance and reduce noise pickup

7 Input Trigger Pulse Rules (See Triggering Truth Table)

TLF6611 – 8

Input to Pin 5(11)

(Pin 3(13) e HIGH)

Pin 4(12) e LOW

t1 t3 e Min Positive Input Pulse Width l 40 ns

t2 t4 e Min Negative Input Pulse Width l 40 ns

TLF6611 – 9

Input to Pin 4(12)

(Pin 3(13) e HIGH)

Pin 5(11) e HIGH

8 The retriggerable pulse width is calculated as shown be-

low

tW e t a tPLH e KRX CX

1a 1R

J atPLH

TLF6611 – 10

The retrigger pulse width is equal to the pulse width (t) plus a delay time For

pulse widths greater than 500 ns tW can be approximated as t Retriggering will

not occur if the retrigger pulse comes within

03 CX (ns) after the initial trigger

pulse (ie during the discharge cycle)

9 Reset OperationAn overriding clear (active LOW level)

is provided on each one shot By applying a LOW to the

reset any timing cycle can be terminated or any new cy-

cle inhibited until the LOW reset input is removed Trigger

inputs will not produce spikes in the output when the re-

set is held LOW

TLF6611 – 11

10 VCC and Ground wiring should conform to good high

frequency standards so that switching transients on VCC

and Ground leads do not cause interaction between one

shots Use of a 001 to 01 mF bypass capacitor be-

tween VCC and Ground located near the DM9602 is rec-

ommended

For further detailed device characteristics and output performance please

refer to the NSC one-shot application note AN-366

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