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PDF RNA51957A Data sheet ( Hoja de datos )
| Número de pieza | RNA51957A | |
| Descripción | Voltage Detecting a System Resetting IC Series | |
| Fabricantes | Renesas Technology | |
| Logotipo |  |
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RNA51957A,B
www.DataSheet4U.com
Voltage Detecting, System Resetting IC Series
REJ03D0912-0100
Rev.1.00
Oct 10, 2008
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
Package Type
Package Code
Package Taping Abbreviation
Abbreviation
(Quantity)
RNA51957AFPH0
SOP-8 pin
PRSP0008DE-C
FP H (2,500 pcs / Reel)
RNA51957BFPH0
SOP-8 pin
PRSP0008DE-C
FP 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
R957A
YMWC
CCC
SOP-8
REJ03D0912-0100 Rev.1.00 Oct 10, 2008
Page 1 of 12
R957B
YMWC
CCC
Type No.
Lot No.
Y : Year Code
(the last digit of year)
M : Month Code
W : Week Code
C : Control Code
Pin No.1
Trace Code
1 page  
RNA51957A,B
Canstant Current at Cd pin vs. Ambient Temperature
–12
VCC = 5V
–10 VCC = 15V
–8
–6
–4
–2
0
–40 –20 0 20 40 60 80 100
Ambient Temperature Ta (°C)
Output Saturation Voltage vs. Output Sink Current
0.3
Supply voltage detecting "L" reset type
: VCC = 4V
Except above mentioned
: VCC = 5V
0.2
0.1
0
0123456
Output Sink Current Isink (mA)
Circuit Current vs. Supply Voltage
(RNA51957B)
800
Ta = –40°C
600
400
Ta = 25°C
200 Ta = 85°C
0
0 4 8 12 16
Supply Voltage VCC (V)
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Threshold Operating Voltage
1.0
Ta = 25°C
0.8
0.6
RL = 2.2kΩ
0.4 RL = 22kΩ
RL = 100kΩ
0.2
0
0 0.2 0.4 0.6 0.8 1.0
Supply Voltage VCC (V)
Output Load Current vs. Output Voltage
(RNA51957A)
–40
–30
VCC = 5V VCC = 10V VCC = 15V
–20
–10
0
0 4 8 12 16
Output Voltage VO (V)
REJ03D0912-0100 Rev.1.00 Oct 10, 2008
Page 5 of 12
5 Page 
RNA51957A,B
Setting of Output Load Resistance (RNA51957B)
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High level output voltage can be set without depending on the power-supply voltage because the output terminal is an
open collector type. However, please guard the following notes.
1. Please set it in value (2 V to 17 V) within the range of the power-supply voltage recommendation.
Moreover, please never impress the voltage of maximum ratings 18 V or more even momentarily either.
2. Please set output load resistance (pull-up resistance) RL so that the output current (output inflow current IL) at L
level may become 4 mA or less. Moreover, please never exceed absolute maximum rating (6 mA).
VCC (2V to 17V)
RL
6
IL ≤ 4mA
Figure 11 Output Load Resistance RL
Others
1. Notes when IC is handled are published in our reliability handbook, and please refer it.
The reliability handbook can be downloaded from our homepage (following URL).
http://www.renesas.com/fmwk.jsp?cnt=reliability_root.jsp&fp=/products/common_info/reliability
2. Additionally, please inquire of our company when there is an uncertain point on use.
REJ03D0912-0100 Rev.1.00 Oct 10, 2008
Page 11 of 12
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet RNA51957A.PDF ] | |
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