Preliminary
Datasheet
RNA51943A, B
Voltage Detecting, System Resetting IC Series
Description
R03DS0024EJ0201
Rev.2.01
Sep 16, 2011
RNA51943A,B are semiconductor integrated circuits designed for detecting supply voltage and resetting all types of
logic circuits such as CPUs.
They fined extensive applications, including battery checking circuit, level detecting circuit and waveform shaping
circuit.
Features
Few external parts
Wide supply voltage range: 2 V to 17 V
Wide application range
Ordering Information
Part Name
RNA51943AUPH1
RNA51943BUPH1
Package Type
UPAK
UPAK
Package Code
PLZZ0004CA-A
PLZZ0004CA-A
Package
Abbreviation
UP
UP
Taping Abbreviation
(Quantity)
H (1,000 pcs / Reel)
H (1,000 pcs / Reel)
Surface
Treatment
1 (Sn-Bi)
1 (Sn-Bi)
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
•
RNA51943A, B
Part No.
4 3 A
4 3 B
Y MW
UPAK
Y MW
W: Week Code
M: Month Code
Y: Year Code
R03DS0024EJ0201 Rev.2.01
Sep 16, 2011
Page 1 of 6
RNA51943A, B
Preliminary
Pin Arrangement
RNA51943A, B
3
Output
2
GND
1
(Top view)
Supply voltage
Outline: PLZZ0004CA-A (UPAK)
Block Diagram
RNA51943A, B
Supply
voltage
A: Built-in Load
B: Open Collector
R1
–
R2
+
1.25V
25μA
Typ
Output
GND
Operating Waveform
RNA51943A, B
Supply voltage
4.25V
0.65V
t
Output state
H
L
Output undefined
t
R03DS0024EJ0201 Rev.2.01
Sep 16, 2011
Page 2 of 6
RNA51943A, B
Preliminary
Absolute Maximum Ratings
(Ta = 25°C, unless otherwise noted)
Item
Supply voltage
Output sink current
Output voltage
Power dissipation
Thermal derating
Operating temperature
Storage temperature
Note:
Symbol
V
CC
Isink
V
O
Pd
K
Topr
Tstg
Ratings
18
6
V
CC
18
800
*
1
7
–40 to +85
–55 to +125
Unit
V
mA
V
mW
mW/°C
°C
°C
Conditions
Type A (output with constant current load)
Type B (open collector output)
Refer to the thermal derating curve.
1. 15 mm
25 mm
0.7 mmt alumina ceramic board, Ta
25°C. If Ta > 25°C, derate by 6.4 mW/°C.
Electrical Characteristics
(Ta = 25°C, unless otherwise noted)
“L” reset type
Item
Detecting voltage
Hysteresis voltage
Detecting voltage
temperature coefficient
Circuit current
Output saturation
voltage
Threshold operating
voltage
Output leakage
current
Output load current
Output high voltage
Propagation delay time
Symbol
V
S
V
S
V
S
/T
I
CC
Vsat
V
OPL
I
OH
I
OC
V
OH
t
PHL
t
PLH
Min
4.05
30
—
—
—
—
—
—
—
–40
V
CC
–0.2
—
—
Typ
4.25
50
0.01
370
340
0.2
0.67
0.55
—
–25
V
CC
–0.06
6
3
Max
4.45
80
—
560
510
0.4
0.8
0.7
30
–17
—
—
—
Unit
V
mV
%/°C
A
V
V
nA
A
V
s
Test Conditions
Type A
, V
CC
= 5V
Type B
, V
CC
= 5V
V
CC
= 4V, Isink = 4mA
L reset type minimum supply
voltage for IC operation
R
L
= 2.2k, Vsat
0.4V
R
L
= 100k, Vsat
0.4V
Type B
Type A
, V
CC
= 5V, V
O
= 1/2
V
CC
Type A
Response time when V
CC
changes H
L
Response time when V
CC
changes L
H
R03DS0024EJ0201 Rev.2.01
Sep 16, 2011
Page 3 of 6
RNA51943A, B
Preliminary
Typical Characteristics
Thermal Derating
900
Power Dissipation Pd (mW)
Detection Voltage V
S
(V)
Detection Voltage vs. Ambient Temperature
4.34
4.32
4.30
4.28
4.26
V
SL
V
SH
800
700
600
500
400
300
200
100
0
0
25
50
75
85
100 125 150
UPAK
(PLZZ0004CA-A)
4.24
4.22
–40 –20
0
20
40
60
80 100
Ambient Temperature Ta (°C)
Ambient Temperature Ta (°C)
Threshold Operating Voltage
1.0
Output Voltage V
OUT
(V)
Ta = 25°C
Output Saturation Voltage vs. Output Sink Current
Output Saturation Voltage Vsat (V)
0.3
V
CC
= 4 V
0.8
0.6
R
L
= 2.2 kΩ
0.2
0.4
0.2
0
0
R
L
= 22 kΩ
R
L
= 100 kΩ
0.1
0.2
0.4
0.6
0.8
1.0
0
0
1
2
3
4
5
6
Supply Voltage V
CC
(V)
Output Load Current vs. Output Voltage
(RNA51943A)
Output Load Current I
CC
(μA)
Output Sink Current Isink (mA)
Circuit Current vs. Ambient Temperature
700
Circuit Current I
CC
(μA)
–40
600
500
400
300
200
100
0
–40 –20
0
20
40
60
80 100
V
CC
= 5 V
–30
V
CC
= 5 V
V
CC
= 10 V V
CC
= 15 V
–20
–10
0
0
4
8
12
16
Output Voltage V
O
(V)
Ambient Temperature Ta (°C)
R03DS0024EJ0201 Rev.2.01
Sep 16, 2011
Page 4 of 6
RNA51943A, B
Preliminary
Example of Application Circuit
Reset Circuit of RNA51943
V
CC
Power-
supply
Output
RNA51943x
GND
R
L
Power-
supply
RESET
Logic circuit
GND
Delay capacitor
Cd
Figure 1 Reset Circuit of RNA51943
Notes: 1. If the RNA5194xx and the logic circuit share a common power source, type A (built-in load type) can be
used whether a pull-up resistor is included in the logic circuit or not.
2. The logic circuit preferably should not have a pull-down resistor, but if one is present, add load resistor R
L
to
overcome the pull-down resistor.
3. It is better to use the RNA5195xx series to cause a delay, but if the delay is caused by the RNA5194xx, the
delay capacitor Cd is applied between the output and GND.
4. When a negative supply voltage is used, the supply voltage side of RNA5194xx and the GND side are
connected to GND and the negative supply voltage respectively.
R03DS0024EJ0201 Rev.2.01
Sep 16, 2011
Page 5 of 6
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