7210-020298-2

DELAYED RELEASE MODE

This mode causes a retriggerable delay in turning off the output

whenever there is a positive transition at the trigger input. The out-

put is turned on without delay in response to a negative transition at

the trigger input.

ONE-SHOT MODE

In this mode, the chip functions like a retriggerable monostable

multi-vibrator. The output is turned on whenever there is a negative

transition at the trigger input. At the end of the programmed delay,

the output is turned off automatically. If there is a negative transition

at the trigger input before the delay is over, the delay is restarted.

A positive transition at the trigger input has no effect on the output

in this mode. NOTE: In One-Shot mode, the TRIGGER input must

be held at logic 1 during a power-up.

SYMBOL

VALUE

UNIT

DC Supply Voltage

+18

V

Voltage (Any Pin)

V

Operating Temperature

-25 to +70

°C

Storage Temperature

-65 to +150

°C

DC ELECTRICAL CHARACERISTICS:

(-25°C

PARAMETER

SYMBOL

MIN

MAX

UNIT

CONDITION

Suppy Voltage

+4.75

+15.0

V

Supply Current

-

3.0

mA

Trigger Input

Logic 1

V

-

Logic 0

0

V

-

All Other Inputs

Logic 1

V

-

Logic 0

0

V

-

Output

Source Current

Io

+1.0

-

mA

for Vo = Vss - 1V

Io

+2.8

-

mA

Io

+4.2

-

mA

SWITCHING CHARACTERISTICS: (See Figure 4)

PARAMETER

SYMBOL

MIN

MAX

UNIT

Oscillator Frequency

-

50

KHz

External Clock Frequency

DC

160

KHz

External Clock, Positive Pulse Width

3

-

µs

External Clock, Negative Pulse Width

3

-

µs

A,B and Trigger Input Set-Up Time

-

300

ns

Time-base Clock to Output Delay

(turn-on delay in Delayed Release mode

and turn-off delay in Delayed Operate mode)

-

1

µs

Time-base Clock to Output Delay at the End of Time Out

-

1.6

µs

Time-base Clock to Output Delay

-

600

ns

(turn-on delay in One- Shot Mode)

MODE DEFINITION TIMING DIAGRAM: (See Figure 3)

DUAL DELAY MODE

Thls is the Default Mode when the inputs A and B are left un-

programmed. The function of the Dual Delay mode is to provide a

time delay on both the turn-on and turn-off of the output. Once turned

on, the output will remain on as long as the trigger input is Logic 0.

Once turned off, the output will remain off as long as the trigger input

is a logic 1.

DELAYED OPERATE MODE

This mode causes a retriggerable delay in turning the output on in re-

sponse to a negative edge at the trigger input. The output is turned

off without delay in response to a positive transition at the trigger in-

put.