RT8H042C Datasheet, PDF (1/4 Pages) Isahaya Electronics Corporation – This is tentative specification

Preliminary
*This is tentative specification.
<MFT>
RT8H042C
DESCRIPTION
OUTLINE DRAWING
Unit：mm
RT8H042C is composed by NPN transistors,
PNP transistors and resistors. This product has the reset
function, and controls the backup function of the memory
of SRAM and the microcomputer (internal organs RAM)
―――
The reset signal（RES） is output to the microcomputer
when the down of power and the power supply are
abnormal. At the same time, RAM is switched from the
main power supply to the backup power supply, the signal
―――
（C S）that becomes a stand-by state is output, and RAM
2.8±0.1
0.65±0.2 1.50±0.1 0.65±0.2
①
⑥
②
⑤
③
④
is switched to the backup circuit.
FEATURES
●Miniaturization of a set.
●Detecting voltage（Power supply watch voltage）
Standard：1.23V
―――
●Chip selection signal output（C S）
―――
●Reset output（RES）
APPLICATION
・ Backup of memories of 3V faction microcomputer
systems such as electronic office equipment,
industrial equipment, and home electrical appliances
・ Control system of power supply where switch of
external source and battery like SRAM board with built-in
backup function is needed
6 54
042
１23
Pin layout
―――
①CS
②CT
③R
④VIN
⑤GND
―――
⑥RES
BLOCK DIAGRAM
VIN
コCンomパpレaraーtoタr ー
R
-
Rリeセseッt cトir回cu路it
+
CS
De遅la延y 回cir路cuit
RES
CT
GND
110428