TL7702B datasheet(9/17 Pages) TI

9 / 17 page

Application examples

Supply voltage Supervisor TL77xx Series

power-on, short voltage fluctuations do not repetitively reset the system. Delay times of 10 to 20ms or

even up to 500 ms will usually avoid these problems. Owing to an internal limitation of discharge current of

the timing capacitor C

t, there is no upper limit for the size of this capacitor.

3. Application examples

Five versions of this circuit are available:

− TL7705A, TL7705B (V

t = 4.55 V):

Application in TTL-systems and micro-

computer systems which require a 5 volt supply (e.g. TMS7000)

− TL7709A (V

t = 7.6 V):

Application

microcomputer

systems

using

the

TMS1XXXNLL.

− TL7712A (V

t = 10.8 V):

Application in CMOS, microprocessor, and memory

circuits with a 12 volt supply.

− TL7715A (V

t = 13.5 V): Application in circuits which operate with a supply voltage

of 15 V, as is found often in analog circuits.

− TL7702A, TL7702B (V

t = 2.5 V):

Application in systems where other supply

voltages are used. The required trigger level my be adjusted with an external

resistor divider at the SENSE input.

Since for most applications the circuits are already adjusted to the appropriate voltage levels, these

devices are easy to use. Figure 5 shows the initialization circuit diagrams for TMS7000 microcomputer

system with supply voltage V

cc = 5 V. The external components required are the decoupling capacitor C

ref

for the reference voltage and the timing capacitor C

t. The outputs of the TL77xx are open collector outputs.

In figure 5 therefore a pull-up resistor is shown at the RESET output to ensure the correct High level.

Figure 5. TL7705A in 5 Volt Microcomputer Applications

TL7702B Datasheet(PDF) 9 Page - Texas Instruments