RENESAS M51945A

M51945A,B/M51946A,B
Voltage Detecting, System Resetting IC Series
REJ03D0774-0200
Rev.2.00
Aug 20, 2007
Description
M51945A,B/M51946A,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 fined extensive applications, including battery checking circuit, level detecting circuit and waveform shaping
circuit.
Features
• Few external parts
• 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
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
Pin Arrangement
M51945AL/BL
M51946AL/BL
5 Output
4 NC
M51945AFP/BFP
M51946AFP/BFP
NC 1
8 NC
7 Power-supply
Input 2
3 GND
NC 3
6 Output
2 Input
1 Power-supply
GND 4
(Top view)
(Top view)
Outline: 5P5T
5 NC
NC: No Connection
Outline: PRSP0008DE-C (recommend)
PRSP0008DA-A (8P2S-A) (not recommend for new design)
REJ03D0774-0200 Rev.2.00 Aug 20, 2007
Page 1 of 10
M51945A,B/M51946A,B
Block Diagram
M51945A, B
Powersupply
M51946A, B
25µA
Typ
Input
Powersupply
A: Built-in Load
B: Open Collector
–
Output
A: Built-in Load
B: Open Collector
25µA
Typ
+
Input
+
Output
–
1.25V
1.25V
GND
GND
Operating Waveform
M51946A, B
Input voltage ∗
Input voltage ∗
M51945A, B
1.25V
1.25V
H
L
t
REJ03D0774-0200 Rev.2.00 Aug 20, 2007
Page 2 of 10
t
Output state
Output state
t
H
L
t
M51945A,B/M51946A,B
Absolute Maximum Ratings
(Ta = 25°C, unless otherwise noted)
Item
Supply voltage
Symbol
VCC
Output sink current
Output voltage
Power dissipation
Ratings
18
Unit
V
Conditions
Isink
VO
6
VCC
mA
V
Type A (output with constant current load)
Pd
18
450
mW
Type B (open collector output)
5-pin SIP
400
300
Thermal derating
Kθ
8-pin SOP (PRSP0008DE-C): recommend
8-pin SOP (PRSP0008DA-A): not recommend
4.5
4.4
mW/°C
Refer to the
thermal derating
curve.
3
5-pin SIP
8-pin SOP (PRSP0008DE-C)
: recommend
8-pin SOP (PRSP0008DA-A)
: not recommend
Operating temperature
Topr
–30 to +85
°C
Storage temperature
Input voltage range
Tstg
VIN
–40 to +125
–0.3 to VCC
°C
V
VCC ≤ 7 V
VCC > 7 V
–0.3 to +7
Electrical Characteristics
(Ta = 25°C, unless otherwise noted)
• “L” reset type M51945A, M51945B
• “H” reset type M51946A, M51946B
Symbol
Min
Typ
Max
Unit
Detecting voltage
Item
VS
1.20
1.25
1.30
V
Hysteresis voltage
∆VS
9
15
23
mV
Detecting voltage
temperature coefficient
VS/∆T
—
0.01
—
%/°C
Supply voltage range
VCC
2
—
17
V
Test Conditions
Input current
IIN
—
100
500
nA
VIN = 1.25V
Circuit current
ICC
—
310
470
µA
Type A, VCC = 5V
—
280
420
Output saturation
voltage
Vsat
—
0.2
0.4
V
L reset type, VCC = 5V, VIN < 1.2V, Isink = 4mA
—
0.2
0.4
Threshold operating
voltage
VOPL
Output leakage
current
IOH
Output load current
IOC
Output high voltage
VOH
tPHL
tPLH
Propagation delay time
Type B, VCC = 5V
H reset type, VCC = 5V, VIN > 1.35V, Isink = 4mA
0.67
0.8
0.55
0.7
—
—
1
µA
Type B
–40
–25
–17
µA
Type A, VCC = 5V, VO = 1/2 × VCC
VCC–0.2
VCC–0.06
—
V
Type A
—
4
—
µs
Response time when VCC changes H → L
—
2
—
REJ03D0774-0200 Rev.2.00 Aug 20, 2007
Page 3 of 10
V
L reset type minimum supply
voltage for IC operation
RL = 2.2kΩ, Vsat ≤ 0.4V
—
—
RL = 100kΩ, Vsat ≤ 0.4V
Response time when VCC changes L → H
M51945A,B/M51946A,B
Typical Characteristics
Thermal Derating
(Maximum Rating)
Detection Voltage vs. Ambient Temperature
(Input voltage detection series)
1.28
5-pin SIP
8-pin SOP
(PRSP0008DE-C)
: recommend
8-pin SOP
(PRSP0008DA-A)
: not recommend
400
300
200
100
0
0
25
50
75 85 100
Detecting Voltage VS (V)
Power Dissipation Pd (mW)
500
1.27
VSH
1.26
1.24
1.23
1.22
–40 –20
125
Ambient Temperature Ta (°C)
VSH
1.25
VSL
1.24
1.23
4
8
12
250
16
RL = 2.2kΩ
RL = 22kΩ
RL = 100kΩ
0.4
0.6
0.8
Supply Voltage VCC (V)
REJ03D0774-0200 Rev.2.00 Aug 20, 2007
Page 4 of 10
1.0
Output Saturation Voltage Vsat (V)
Output Voltage VOUT (V)
0.6
0.2
VIN = 1.25V
Ta = –30°C
100
Ta = 25°C
50
Ta = 85°C
4
8
12
16
20
Output Saturation Voltage vs. Output Sink Current
0.3
0.8
0
0
80 100
Supply Voltage VCC (V)
Ta = 25°C
0.2
60
150
0
0
20
Threshold Operating Voltage
([L] reset type)
0.4
40
200
Supply Voltage VCC (V)
1.0
20
Input Current vs. Supply Voltage
(Input voltage detection series)
Input Current IIN (nA)
Detecting Voltage VS (V)
1.27
1.22
0
0
Ambient Temperature Ta (°C)
Detection Voltage vs. Supply Voltage
(Input voltage detection series)
1.28
1.26
VSL
1.25
Supply voltage detecting "L" reset type
: VCC = 4V
Except above mentioned
: VCC = 5V
0.2
0.1
0
0
1
2
3
4
5
Output Sink Current Isink (mA)
6
M51945A,B/M51946A,B
Circuit Current ICC (µA)
Circuit Current vs. Supply Voltage
(M51945B, M51946B)
800
600
Ta = –30°C
400
Ta = 25°C
200
0
0
Ta = 85°C
4
8
12
16
Supply Voltage VCC (V)
Example of Application Circuit
Reset Circuit of M5194xx Series
Powersupply
R1
RL
Output
Input
GND
VCC
RESET (RESET)
Logic circuit
M5194xx
R2
Powersupply
Cd
GND
Figure 1 Reset Circuit of M5194xx Series
Notes: 1. When the detecting supply voltage is 4.25 V, M51943 and M51944 are used and R1 and R2 are not necessary.
When the voltage is anything except 4.25 V, M51945 and M51946 are used. In this case, the detecting
supply voltage is 1.25 × (R1 +R2)/R2 (V) approximately. The detecting supply voltage can be set between 2
V and 15 V.
2. If the M5194xx 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.
3. The logic circuit preferably should not have a pull-down resistor, but if one is present, add load resistor RL to
overcome the pull-down resistor.
4. It is better to use the M5195xx series to cause a delay, but if the delay is caused by the M5194xx series, the
delay capacitor Cd is applied between the output and GND.
5. When the reset terminal in the logic circuit is of the low reset type, M51943 and M51945 are used and when
the terminal is of the high reset type, M51944 and M51946 are used.
6. When a delay is necessary at both rise time and fall time, M51945 and M51946 are used and the series
resistors (R11, R12) are applied between the output and GND or instead of R1, and these connect the capacitor
between the connection point and GND. The connection point of the capacitor is fixed according to the ratio
of delay at fall/rise time.
7. When a negative supply voltage is used, the supply voltage side of M5194xx and the GND side are
connected to GND and the negative supply voltage respectively.
REJ03D0774-0200 Rev.2.00 Aug 20, 2007
Page 5 of 10
M51945A,B/M51946A,B
Notice for use
About the Power Supply Line
1. About bypass capacitor
Because the ripple and the spike of the high frequency noise and the low frequency are superimposed to the power
supply line, it is necessary to remove these.
Therefore, please install C1 and C2 for the low frequency and for the high frequency between the power supply line
and the GND line as shown in following figure 2.
VCC
+
C1
C2
Power-supply
R1
Example of ripple
noise measures
Input
Vin
R2
M51945
M51946
Output
GND
Figure 2 Example of Ripple Noise Measures
2. The sequence of voltage impression
Please do not impress the voltages to the input terminals earlier than the power supply terminal. Moreover, please
do not open the power supply terminal with the voltage impressed to the input terminal.
(The setting of the bias of an internal circuit collapses, and a parasitic element might operate.)
About the Input Terminal
1. Setting range of input voltage
The following voltage is recommended to be input to the input terminal (pin 2).
about 0.8 (V) < Vin < VCC – 0.3 (V) .... at VCC ≤ 7 V
about 0.8 (V) < Vin < 6.7 (V) .............. at VCC > 7 V
2. About using input terminal
Please do an enough verification to the transition characteristic etc. of the power supply when using independent
power supply to input terminal (pin 2).
VCC
Vin is decided to the VCC subordinating,
and operates in the range
about 0.8 (V) < Vin < VCC – 0.3 (V).
Output
Power-supply
Input
Vin
M51945
M51946
GND
Figure 3 Recommended Example
REJ03D0774-0200 Rev.2.00 Aug 20, 2007
Page 6 of 10
M51945A,B/M51946A,B
VCC1
Independent
VCC2
VCC
Independent
Power-supply
Input
Vin
M51945
M51946
Output
Input
Vin
Power-supply
M51945
M51946
Output
VCC
GND
GND
Example 1. Independent power supply system
Please do enough verifying about
transition characteristic of VCC1
and VCC2.
GND
Example 2. Logic pulse input
(not recommended)
Figure 4
3. Calculation of detecting voltage
Detecting voltage Vs can be calculated by the following expression.
However, the error margin is caused in the detecting voltage because input current Iin (standard 100 nA) exists if it
sets too big resistance.
Please set the constant to disregard this error margin.
R1 + R 2
VS = 1.25 ×
+ Iin × R1
R2
error margin
VCC
Power-supply
R1
Vin
R2
Iin
→
Input
M51945
M51946
Output
GND
Figure 5 Influence of Input Current
4. About the voltage input outside ratings
Please do not input the voltage outside ratings to the input terminal.
An internal protection diode becomes order bias, and a large current flows.
REJ03D0774-0200 Rev.2.00 Aug 20, 2007
Page 7 of 10
M51945A,B/M51946A,B
Setting of Output Load Resistance (M51945B/M51946B)
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 6 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.
REJ03D0774-0200 Rev.2.00 Aug 20, 2007
Page 8 of 10
M51945A,B/M51946A,B
Package Dimensions
5P5T
Plastic 5pin 240mil SIP
EIAJ Package Code
SIP5-P-240-2.54
Weight(g)
0.22
JEDEC Code
–
Lead Material
Cu Alloy
D
L
A1
A
A2
E
Symbol
1
5
b
e
E1
b2
A
A1
A2
b
b1
b2
c
D
E
E1
e
L
c
b1
SEATING PLANE
JEITA Package Code
P-SOP8-4.4x4.85-1.27
RENESAS Code
PRSP0008DE-C
*1
Previous Code
—
MASS[Typ.]
0.1g
F
D
8
Dimension in Millimeters
Min
Nom
Max
–
–
6.1
–
–
1.4
–
–
4.0
0.4
0.5
0.6
1.1
1.2
1.5
0.75
0.85
1.15
0.22
0.27
0.34
11.7
11.9
11.5
1.77
1.97
2.17
0.6
0.7
0.8
–
–
2.54
–
–
3.0
NOTE)
1. DIMENSIONS"*1 (Nom)"AND"*2"
DO NOT INCLUDE MOLD FLASH.
2. DIMENSION"*3"DOES NOT
INCLUDE TRIM OFFSET.
5
c
*2
E
HE
bp
Index mark
Terminal cross section
( Ni/Pd/Au plating )
Z
Reference
Symbol
4
1
e
*3
bp
x
M
A
A2
L1
A1
θ
L
y
Detail F
REJ03D0774-0200 Rev.2.00 Aug 20, 2007
Page 9 of 10
D
E
A2
A1
A
bp
b1
c
c1
θ
HE
e
x
y
Z
L
L1
Dimension in Millimeters
Min Nom Max
4.65 4.85 5.05
4.2
4.4 4.6
1.85
0.00 0.1 0.20
2.03
0.34 0.4 0.46
0.15 0.20 0.25
0°
8°
5.7 6.2 6.5
1.12 1.27 1.42
0.12
0.10
0.75
0.25 0.45 0.65
0.90
M51945A,B/M51946A,B
JEITA Package Code
P-SOP8-4.4x5-1.27
RENESAS Code
PRSP0008DA-A
MASS[Typ.]
0.07g
E
5
*1
HE
8
Previous Code
8P2S-A
F
1
NOTE)
1. DIMENSIONS "*1" AND "*2"
DO NOT INCLUDE MOLD FLASH.
2. DIMENSION "*3" DOES NOT
INCLUDE TRIM OFFSET.
4
Index mark
c
A2
*2
A1
D
L
A
Reference
Symbol
*3
e
bp
y
D
E
A2
A1
A
bp
c
Detail F
HE
e
y
L
REJ03D0774-0200 Rev.2.00 Aug 20, 2007
Page 10 of 10
Dimension in Millimeters
Min Nom Max
4.8 5.0 5.2
4.2 4.4 4.6
1.5
0.05
1.9
0.35 0.4 0.5
0.13 0.15 0.2
0°
10°
5.9 6.2 6.5
1.12 1.27 1.42
0.1
0.2 0.4 0.6
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