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PDF TA7900S Data sheet ( Hoja de datos )
| Número de pieza | TA7900S | |
| Descripción | 5V VOLTAGE REGULATOR WITH WATCHDOG TIMER | |
| Fabricantes | Toshiba Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de TA7900S (archivo pdf) en la parte inferior de esta página. Total 15 Páginas | ||
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TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic
TA7900S,TA7900F
TA7900S/F
5V Voltage Regulator with Watchdog Timer
The TA7900S, TA7900F is an IC specially designed for
micro-computer systems. It produces an output voltage of
5±0.25V without need for adjustment from its accurate reference
voltage and amplifier circuit.
At power-on, it outputs a reset signal to reset the system. It will
also output a reset signal when the 5V output voltage drops
below 92% because of external disturbance or other problem. It
also incorporates a watchdog timer for self-diagnosing the system.
When the system malfunctions, the IC generates reset pulses
intermittently to prevent the system from running away.
Features
l Accurate output
: 5±0.25V
l Output voltage adjusting pin attached
l Power-on reset timer incorporated
l Watchdog timer incorporated
l Operating temperature range : from −40 to 85°C
l Wide operating voltage range : 40V (max.)
l SIP-9 pin (TA7900S)
l SOP-14 pin (TA7900F)
TA7900S
TA7900F
Weight
SIP9-P-2.54A
: 0.92 g (typ.)
SOP14-P-225-1.27 : 0.20 g (typ.)
1 2002-02-27
1 page  
Timing Chart
TA7900S/F
Note: TRST (1), TRST (2), TWD, TW : See Attached Electrical Characteristics.
Maximum Ratings (Ta = 25°C)
Characteristics
Symbol
Input Voltage
Output Current
Output Voltage
Power Dissipation
Operating Temperature
Storage Temperature
Lead Temperature time
VIN1
VIN2
IOUT1
IOUT2
VOUT1
VOUT2
PD
Topr
Tstg
Tsol
VIN1
VIN2
IOUT1, VOUT1
IOUT2, VOUT2
PD
: BIAS input
: CK
input
: OUT
output
: RESET output
: TA7900S / TA7900F
Rating
40
−0.3 to +16
10
4
40
16
500 / 280
−40 to 85
−55 to 150
260 (10s)
Unit
V
mA
V
mW
°C
°C
°C
5 2002-02-27
5 Page 
2. High Output Current Circuit
ILOAD = 300mA Max., VBATT = 6~17V
TA7900S/F
Example of Application Circuit Using Darlington Transistor
*: Select a C1 value according to the working condition - - typically above 2000pF.
Insert ZD when necessary.
Application Circuit of Watchdog / Reset Timer
1. TRST (1) ≒ 10ms···Power-On Reset Timer
2. TRST (1) ≒ 1.5TWD
11 2002-02-27
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet TA7900S.PDF ] | |
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