TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic
TA7900S,TA7900F
TA7900S/F
5V Voltage Regulator with Watch...
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
Block Diagram and Pin Layout
TA7900S
TA7900F
TA7900S/F
Note : The TA7900S and TA7900F are the same chip, except that they are housed in different packages.
2 2002-02-27
Pin Description
Pin No.
TA7900S
TA7900F
1 12
2 14 31 43 54 65
77
88 9 10 ― 2, 6, 9, 11, 13
TA7900S/F
Symbol
BIAS
OUT COMP
VCC GND ADJ
RESET
TC CK NC
Description
Power supply starting pin. The starting current is s...