RNA51957A,B
Voltage Detecting, System Resetting IC Series
REJ03D0912-0200
Rev.2.00
Mar 02, 2009
Description
RNA51957A,B are semiconductor integrated circuits for resetting of all types of logic circuits such as CPUs, and
has the feature of setting the detection voltage by adding external resistance.
They include a built-in delay circuit to provide the desired retardation time simply by adding an external capacitor.
They fined extensive applications, including battery checking circuit, level detecting circuit and waveform shaping
circuit.
Features
• Few external parts
• Large delay time with a capacitor of small capacitance (td ≈ 100 ms, at 0.33 µF)
• Low threshold operating voltage (Supply voltage to keep low-state at low supply voltage):
0.6 V (Typ) at RL = 22 kΩ
• Wide supply voltage range: 2 V to 17 V
• Wide application range
• Ordering Information
Part Name
RNA51957AFPH0
RNA51957BFPH0
Package Type
Package Code
Package
Abbreviation
SOP-8 pin
SOP-8 pin
PRSP0008DE-C
PRSP0008DE-C
FP
FP
Taping Abbreviation
(Quantity)
H (2,500 pcs / Reel)
H (2,500 pcs / Reel)
Surface
Treatment
0 (Ni/Pd/Au)
0 (Ni/Pd/Au)
Application
• Reset circuit of Pch, Nch, CMOS, microcomputer, CPU and MCU, Reset of logic circuit, Battery check circuit,
switching circuit back-up voltage, level detecting circuit, waveform shaping circuit, delay waveform generating
circuit, DC/DC converter, over voltage protection circuit
Recommended Operating Condition
• Supply voltage range: 2 V to 17 V
Outline and Article Indication
• RNA51957A, B
Type No.
R957A
YMWC
CCC
R957B
YMWC
CCC
SOP-8
Pin No.1
REJ03D0912-0200 Rev.2.00 Mar 02, 2009
Page 1 of 12
Trace Code
Lot No.
Y : Year Code
(the last digit of year)
M : Month Code
W : Week Code
C : Control Code
