|
|
PDF TA8008F Data sheet ( Hoja de datos )
| Número de pieza | TA8008F | |
| Descripción | VOLTAGE REGULATOR WITH WAKE UP TIMER | |
| Fabricantes | Toshiba | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de TA8008F (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
|
No Preview Available !
TA8008F
TOSHIBA BIPOLAR LINEAR INTEGRATED CIRCUIT SILICON MONOLITHIC
TA8008F
Voltage Regulator With Wake Up Timer
The TA8008F is designed for microcomputer systems.
It incorporates a highly accurate constant-voltage power supply
(5 ± 0.15V), wake up timer which can make low current
consumption of the system and various system reset function in a
chip.
The wake up timer starts CPU system and etc. in periodically
and decrease average current consumption. Starting period can
be set with external capacitor.
The watchdog timer works while the system is working.
The TA8008F incorporates current limiter of 600mA (Typ.), so it
is possible to build the system easily without external protection
circuits and detection resistors.
Weight: 0.14 g (typ.)
FEATURES
l Accurate output
: 5 ± 0.15V (Ta = −40 to 105°C)
l Low standby current
: 0.95mA (Max.)
l Wake up timer incorporated : It is possible to set the periodical time with external capacitor.
l Reset function
: Power on reset (The power on reset function can be selected for its function
through the SE pin.)
Watchdog reset
l Current limiter incorporated : 600mA (Typ.)
l External parts are a few.
l Plastic SSOP 16 Pin Package.
1 2002-12-18
1 page  
TA8008F
· Power-on reset timer function
To allow the 5V constant voltage to stabilize at power-on, as well as provide a sufficient time for the
clock oscillation in the CPU to stabilize, the device remains reset for a predetermined time before
being released from the reset state. The duration of this time can be set as desired by choosing
appropriate values for the external capacitor connected to the TCR pin.
The system starts charging the capacitor when the VCC voltage exceeds 4.6V. When this charge
voltage exceeds 4V, the capacitor is discharged by the IC’s internal transistor. When the capacitor is
discharged down to 2V, the reset signal is inverted to deactivate the reset.
Also, when the wakeup timer is operating, the select pin SE can be chosen to know whether a
power-on reset is generated at switchover from standby to active modes.
· Watchdog timer function
Program your system to output a clock each time one program routine is finished in the CPU system
software, and input this clock to the CK pin of the IC. The IC’s TC pin is repeatedly charged and
discharged between 2V and 4V. However, when a clock is input, it switches over and starts
discharging in the middle of charging and then starts charging from 2V again. Since the clock is
generated at predetermined intervals when the CPU system is operating normally, the TC pin
switches over and starts discharging before the charge voltage reaches 4V. However, if no clock is
input while being charged from 2V to 4V, the clock is assumed to have stopped, i.e., the CPU system
has gone wild, so that a reset signal is output to reset the CPU system.
The IC’s CK pin is connected to the CPU system with a differential circuit. This is to ensure that when
an erratic condition occurs in the CPU system, a low signal is always input to the CK pin regardless of
whether the clock output from the CPU has stopped in the high or low state.
When the CK pin is connected to RESET pin, no reset signal is output, in which case only the
power-on reset timer is useful. However, it also needs to connect to VCC through a resister, because
the output voltage of RESET goes down by combination of inner resisters .
5 2002-12-18
5 Page 
Package Dimensions
TA8008F
Weight: 0.14 g (typ.)
11 2002-12-18
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet TA8008F.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| TA8008F | VOLTAGE REGULATOR WITH WAKE UP TIMER | Toshiba |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |