MB3793-37DPNF-G-JN-ERE1 数据手册
MB3793-34D/37D/40D/42D/45D
Power-Voltage Monitoring IC
with Watchdog Timer
Description
The MB3793 is an integrated circuit to monitor power voltage; it incorporates a watchdog timer.
A reset signal is output when the power supply voltage is cut or falls instantaneously. When the power supply recovers normally after
resetting, a power-on reset signal is output to monitor the power supply voltage. A built-in watchdog timer with two inputs for system
operation diagnosis can provide a fail-safe function for various application systems.
Model No.
Marking Code
Detection Voltage
MB3793-34D
3793DJ
3.4 V
MB3793-37D
3793DF
3.7 V
MB3793-40D
3793DC
4.0 V
MB3793-42D
3793DA
4.2 V
MB3793-45D
3793D7
4.5 V
Features
Precise detection of power voltage fall: ±2.5%
Detection voltage with hysteresis
Built-in dual-input watchdog timer
Watchdog timer halt function
Independently-set watchdog and reset times
Open drain output
Package : SOP8
Applications
The MB3793 has various uses such as the amusement devices.
Online Design Simulation
Easy DesignSim
This product supports the web-based design simulation tool. It can easily select
external components and can display useful information. Please access from the
following URL.
cypress.transim.com/login.aspx
Cypress Semiconductor Corporation
Document Number: 002-08399 Rev *C
•
198 Champion Court
•
San Jose, CA 95134-1709
•
408-943-2600
Revised June 27, 2017
MB3793-34D/37D/40D/42D/45D
Contents
Description .............................................................................................................................................................................. 1
Features................................................................................................................................................................................... 1
Applications ............................................................................................................................................................................ 1
1. Pin Assignment ................................................................................................................................................................. 3
2. Pin Description .................................................................................................................................................................. 3
3. Block Diagram ................................................................................................................................................................... 4
4. Block Functions ................................................................................................................................................................ 5
5. Absolute Maximum Ratings ............................................................................................................................................. 6
6. Recommended Operating Conditions ............................................................................................................................. 6
7. Electrical Characteristics ................................................................................................................................................. 7
7.1
DC Characteristics......................................................................................................................................................... 7
7.2
AC Characteristics ......................................................................................................................................................... 8
8. Timing Diagram ................................................................................................................................................................. 9
9. Operation Sequence ....................................................................................................................................................... 14
10. Typical Characteristics ................................................................................................................................................... 16
11. Application Example ....................................................................................................................................................... 19
12. Usage Precaution ............................................................................................................................................................ 21
13. Ordering Information ...................................................................................................................................................... 21
14. RoHS Compliance Information ...................................................................................................................................... 21
15. Package Dimensions ...................................................................................................................................................... 22
16. Major Changes ................................................................................................................................................................ 23
Document History ................................................................................................................................................................. 23
Sales, Solutions, and Legal Information ............................................................................................................................. 24
Document Number: 002-08399 Rev *C
Page 2 of 24
MB3793-34D/37D/40D/42D/45D
1. Pin Assignment
(TOP VIEW)
RESET
1
8
CK1
CTW
2
7
CK2
CTP
3
6
INH
GND
4
5
VCC
(SOB008)
2. Pin Description
Pin No.
Symbol
1
/RESET
2
CTW
Watchdog timer monitoring time setting pin
3
CTP
Power-on reset hold time setting pin
4
GND
Ground pin
5
VCC
Power supply pin
6
INH
This pin forces the watchdog timer on/off. When setting this pin to the High level, the
watchdog timer is stopped.
7
CK2
Clock 2 input pin
8
CK1
Clock 1 input pin
Document Number: 002-08399 Rev *C
Description
Reset output pin (Open drain)
Page 3 of 24
MB3793-34D/37D/40D/42D/45D
3. Block Diagram
To VCC of all blocks
I1 ≈ 3 A
5 V CC
I2 ≈ 3 0 A
C TP 3
R1*
Logic circuit
/R E S ET 1
Output circuit
IN H 6
Comp.S
C TW 2
Watchdog
timer
-
Reference
voltage
generator
VS
+
Pulse generator 1
VREF ≈ 1.24 V
CK 1 8
R2 ≈
2 4 0 k
Pulse generator 2
To GND of
all blocks
CK 2 7
4 G ND
*: See the following table.
Model No.
Resistance Value (R1)
MB3793-34D
435 k
MB3793-37D
494 k
MB3793-40D
553 k
MB3793-42D
590 k
MB3793-45D
650 k
Document Number: 002-08399 Rev *C
Page 4 of 24
MB3793-34D/37D/40D/42D/45D
4. Block Functions
Comp.S
Comp.S is a comparator with hysteresis to compare the reference voltage with a voltage (V S) that is the result of dividing the
power supply voltage (VCC) by resistors R1 and R2. When VS falls below 1.24 V, a reset signal is output. This function enables the
MB3793 to detect an abnormality within 1 s when the power supply is cut or falls instantaneously.
Output Circuit
The output circuit has a comparator to control the reset signal (/RESET) output. When the voltage at the CTP pin for setting the
power-on reset hold time exceeds the threshold voltage, resetting is canceled.
Pulse Generator
The pulse generator generates pulses when the voltage at the CK1 and CK2 input clock pins changes from Low level to High
level (positive-edge trigger) and exceeds the threshold voltage; it sends the clock signal to the watchdog timer.
Watchdog Timer
The watchdog timer can monitor two clock pulses. Short-circuit the CK1 and CK2 clock pins to monitor a single clock pulse.
Logic Circuit
The logic circuit controls charging and discharging of the power-on reset hold time setting capacity (CTP) on a signal of Comp.S
and Watchdog timer.
Document Number: 002-08399 Rev *C
Page 5 of 24
MB3793-34D/37D/40D/42D/45D
5. Absolute Maximum Ratings
Rating
Parameter
Symbol
Unit
Min
Max
VCC
0.3
7.0
V
V/RESET
0.3
7.0
V
CK1
VCK1
CK2
VCK2
INH
VINH
Power supply voltage (*1)
/RESET pin voltage
Input voltage(*1)
Conditions
VOL,
Reset output voltage(*1)
/RESET
VOH (*2)
VCC 0.3
0.3
( 7)
V
0.3
7.0
V
Reset output current
IOL
0
10
mA
Power dissipation
PD
Ta 85 C
200
mW
Tstg
55
125
C
Storage temperature
*1: The voltage is based on the ground voltage (0 V).
*2: The reset output voltage VOH is the applied voltage to the pull-up resistor.
WARNING:
1. Semiconductor devices may be permanently damaged by application of stress (including, without
limitation, voltage, current or temperature) in excess of absolute maximum ratings. Do not exceed any of these ratings.
6. Recommended Operating Conditions
Value
Parameter
Symbol
Conditions
Unit
Min
Typ
Max
VCC
1.2
5.0
6.0
V
V/RESET
0
6.0
V
Reset (/RESET) output current
IOL
0
5
mA
Power-on reset hold time setting capacity
CTP
0.001
0.1
10
F
Watchdog timer monitoring time setting capacity (*1)
CTW
0.001
0.01
1
F
Operating ambient temperature
Ta
40
25
85
C
Power supply voltage
/RESET pin voltage
*1: The watchdog timer monitor time range depends on the rating of the setting capacitor.
WARNING:
1. The recommended operating conditions are required in order to ensure the normal operation of the semiconductor device. All of
the device's electrical characteristics are warranted when the device is operated under these conditions.
2. Any use of semiconductor devices will be under their recommended operating condition.
3. Operation under any conditions other than these conditions may adversely affect reliability of device and could result in device
failure.
4. No warranty is made with respect to any use, operating conditions or combinations not represented on this data sheet. If you
are considering application under any conditions other than listed herein, please contact sales representatives beforehand.
Document Number: 002-08399 Rev *C
Page 6 of 24
MB3793-34D/37D/40D/42D/45D
7. Electrical Characteristics
7.1 DC Characteristics
(VCC = +5 V, Ta = +25C)
Parameter
Power supply
current
Symbol
Typ
Max
MB3793-34D
38
50
A
MB3793-37D
30
50
A
33
48
A
27
50
A
MB3793-40D
ICC1
After exit from reset
MB3793-45D
VSL
VCC falling
MB3793-34D
VSH
VSL
VCC rising
VCC falling
MB3793-37D
VSH
VSL
voltage
VCC rising
VCC falling
MB3793-40D
VSH
VSL
VCC rising
VCC falling
MB3793-42D
VSH
VSL
VCC rising
VCC falling
MB3793-45D
VSH
Detection
voltage
hysteresis
width
Unit
Min
MB3793-42D
Detection
Value
Conditions
VCC rising
Ta 25 C
Ta 40 C to 85 C
Ta 25 C
Ta 40 C to 85 C
Ta 25 C
Ta 40 C to 85 C
Ta 25 C
Ta 40 C to 85 C
Ta 25 C
Ta 40 C to 85 C
Ta 25 C
Ta 40 C to 85 C
Ta 25 C
Ta 40 C to 85 C
Ta 25 C
Ta 40 C to 85 C
Ta 25 C
Ta 40 C to 85 C
Ta 25 C
Ta 40 C to 85 C
MB3793-34D
MB3793-37D
MB3793-40D
VSHYS
VSH VSL
MB3793-42D
MB3793-45D
CK input threshold voltage
CK input hysteresis width
INH input voltage
Document Number: 002-08399 Rev *C
VCIH
31
45
A
3.32
3.40
3.48
V
3.27 (*1)
3.40
3.53 (*1)
V
3.40
3.48
3.56
V
3.35 (*1)
3.48
3.61 (*1)
V
3.60
3.70
3.80
V
3.55 (*1)
3.70
3.85 (*1)
V
3.69
3.79
3.89
V
3.64 (*1)
3.79
3.94 (*1)
V
3.90
4.00
4.10
V
3.85 (*1)
4.00
4.15 (*1)
V
3.99
4.09
4.19
V
3.94 (*1)
4.09
4.24 (*1)
V
4.10
4.20
4.30
V
4.05 (*1)
4.20
4.35 (*1)
V
4.20
4.30
4.40
V
4.15 (*1)
4.30
4.45 (*1)
V
4.40
4.50
4.60
V
4.35 (*1)
4.50
4.65 (*1)
V
4.50
4.60
4.70
V
4.45 (*1)
4.60
4.75 (*1)
V
35
80
120
mV
40
85
130
mV
50
95
140
mV
50
100
150
mV
50
100
150
mV
1.4(*1)
1.9
2.5
V
VCIL
0.8
1.3
1.8(*1)
V
VCHYS
0.4(*1)
0.6
0.8(*1)
V
VIIH
3.5
VCC
V
VIIL
0
0.8
V
Page 7 of 24
MB3793-34D/37D/40D/42D/45D
(VCC = +5 V, Ta = +25C)
Parameter
Symbol
Logic input current
Value
Conditions
Unit
Min
Typ
Max
0
1.0
A
IIH
VIH = VCC
IIL
VIL = 0 V
-1.0
0
A
Reset output voltage
VOL
I/RESET = +5 mA
0.12
0.40
V
Reset output minimum
VCCL
I/RESET = +50 A
0.8
1.2
V
power
Cut
off supply
currentvoltage
Ioff
V/RESET = 6.0 V
1
A
(CK1, CK2, INH)
*1: This parameter is guaranteed by design, which is not supported by a final test.
7.2 AC Characteristics
(VCC = +5 V, Ta = +25C)
Parameter
Symbol
Value
Conditions
Unit
Min
Typ
Max
Power-on reset hold time
tPR
CTP = 0.1 F
80
130
180
ms
Watchdog timer monitoring time
tWD
CTW = 0.01 F,
7.5
15.0
22.5
ms
Watchdog timer reset time
tWR
CTP = 0.1 F
5
10
15
ms
CK input pulse width
tCKW
500
ns
CK input pulse cycle
tCKT
20
s
500
ns
Reset falling time
Tf (*1)
CL = 50 pF,
*1: The voltage range is 10% to 90% at testing
the reset
Pull-up
470 koutput transition time.
Document Number: 002-08399 Rev *C
Page 8 of 24
MB3793-34D/37D/40D/42D/45D
8. Timing Diagram
Figure 8-1 Basic Operation (Positive Clock Pulse)
VSH
VSL
VCC
tCKW
CK1
tCKT
CK2
INH
Vth
CTP
VH
CTW
VL
/RESET
tPR
(1) (2)
Document Number: 002-08399 Rev *C
(3)
tWD
(4)(5) (5)
tPR
tWR
(6) (7)
(8) (9)
(10)
(11)
(12)
(13)
Page 9 of 24
MB3793-34D/37D/40D/42D/45D
Figure 8-2 Basic Operation (Negative Clock Pulse)
VSH
VSL
VCC
tCKW
CK1
tCKT
CK2
INH
Vth
CTP
VH
CTW
VL
/RESET
tPR
(1) (2)
Document Number: 002-08399 Rev *C
tWD
(3)
(4)(5) (5)
tPR
tWR
(6) (7)
(8) (9)
(10)
(11)
(12)
(13)
Page 10 of 24
MB3793-34D/37D/40D/42D/45D
Figure 8-3 Single-clock Input Monitoring (Positive Clock Pulse)
tCKW
CK1,
CK2
tCKT
Vth
CTP
VH
CTW
VL
/RESET
tWD
tWR
Note : The MB3793 can monitor only one clock.
The MB3793 checks the clock signal at every other input pulse.
Therefore, set watchdog timer monitor time tWD to the time that allows the MB3793
to monitor the period twice as long as the input clock pulse.
Document Number: 002-08399 Rev *C
Page 11 of 24
MB3793-34D/37D/40D/42D/45D
Figure 8-4 Inhibit Function Operation (Positive Clock Pulse)
VSH
VSL
VCC
tCKW
CK1
tCKT
CK2
INH
Vth
CTP
VH
CTW
VL
/RESET
tPR
(1) (2)
Document Number: 002-08399 Rev *C
tWD
(3)
(4)(5) (5)
tPR
tWR
(6) (7)
(11) (8) (9)
(10)
(12)
(13)
Page 12 of 24
MB3793-34D/37D/40D/42D/45D
Figure 8-5 Clock Pulse Input Supplementation (Positive Clock Pulse)
tCKT
tCKW
*
CK1
*
CK2
VH
CTW
VL
Note : The MB3793 watchdog timer monitors Clock1 (CK1) and Clock2 (CK2) pulses alternately.
When a CK2 pulse is detected after detecting a CK1 pulse, the monitoring time setting capacity
(CTW) switches to charging from discharging.
Therefore, the second and later pulses will be ignored even if only CK1 or CK2 pulses are input
continuously like * (the * pulse is ignored in the example above).
Document Number: 002-08399 Rev *C
Page 13 of 24
MB3793-34D/37D/40D/42D/45D
9. Operation Sequence
Positive Clock Pulse Input
See “Figure 8-1 Basic Operation (Positive Clock Pulse)” under “8. Timing Diagram”.
Negative Clock Pulse Input
See “Figure 8-2 Basic Operation (Negative Clock Pulse)” under “8. Timing Diagram”.
The MB3793 operates in the same way whether it inputs positive or negative pulses.
Single-clock Input monitoring
To use the MB3793 while monitoring only one clock, connect clock pins CK1 and CK2.
Although the MB3793 operates basically in the same way as when monitoring two clocks, it monitors the clock signal at every
other input pulse.
See “Figure 8-3 Single-clock Input Monitoring (Positive Clock Pulse)” under “8. Timing Diagram”.
Description of Operations
The numbers given to the following items correspond to numbers (1) to (13) used in “8. Timing Diagram”.
(1) The MB3793 outputs a reset signal when the power supply voltage (VCC) reaches about 0.8 V (VCCL).
(2) If VCC reaches or exceeds the rise-time detected voltage VSH, the MB3793 starts charging the power-on reset hold time
setting capacitor CTP. At this time, the output remains in a reset state.
(3) When CTP has been charged for a certain period of time TPR (until the CTP pin voltage exceeds the threshold voltage (V th)
after the start of charging), the MB3793 cancels the reset (setting the /RESET pin to “H” level from “L” level).
The Vth value is about 3.6 V with VCC = 5.0 V
The power-on reset hold time tPR is set with the following equation:
tPR (ms) ≈ A CTP (F)
The value of A is about 1300 with VCC = 5.0 V. The MB3793 also starts charging the watchdog timer monitor time setting
capacitor (CTW).
(4) When the voltage at the watchdog timer monitor time setting pin CTW reaches the “H” level threshold voltage VH, the CTW
switches from the charge state to the discharge state.
The value of VH is always about 1.24 V regardless of the detected voltage.
(5) If the CK2 pin inputs a clock pulse (positive edge trigger) when the C TW is being discharged in the CK1-CK2 order or
simultaneously, the CTW switches from the discharge state to the charge state.
The MB3793 repeats operations (4) and (5) as long as the CK1/CK2 pin inputs clock pulses with the system logic circuit
operating normally.
(6) If no clock pulse is fed to the CK1 or CK2 pin within the watchdog timer monitor time tWD due to some problem with the system
logic circuit, the CTW pin is set to the “L” level threshold voltage VL or less and the MB3793 outputs a reset signal (setting the
/RESET pin to “L” level from “H” level).
The value of VL is always about 0.24 V regardless of the detected voltage.
The watchdog timer monitor time tWD is set with the following equation:
tWD (ms) ≈ B CTW (F) C CTP (F)
The value of B is hardly affected by the power supply voltage; it is about 1500 with V CC = 5.0 V.
The value of C is 0.
For this reason:
tWD (ms) ≈ B CTW (F)
Document Number: 002-08399 Rev *C
Page 14 of 24
MB3793-34D/37D/40D/42D/45D
(7) When a certain period of time tWR has passed (until the CTP pin voltage reaches or exceeds V th again after recharging the
CTP), the MB3793 cancels the reset signal and starts operating the watchdog timer.
The watchdog timer monitor reset time tWR is set with the following equation:
tWR (ms) ≈ D CTP (F)
The value of D is 100 with VCC = 5.0 V.
The MB3793 repeats operations (4) and (5) as long as the CK1/CK2 pin inputs clock pulses. If no clock pulse is input, the
MB3793 repeats operations (6) and (7).
(8) If VCC is lowered to the fall-time detected voltage (VSL) or less, the CTP pin voltage decreases and the MB3793 outputs a
reset signal (setting the /RESET pin to “L” level from “H” level).
(9) When VCC reaches or exceeds VSH again, the MB3793 starts charging the CTP.
(10) When the CTP pin voltage reaches or exceeds Vth, the MB3793 cancels the reset and restarts operating the watchdog timer.
It repeats operations (4) and (5) as long as the CK1/CK2 pin inputs clock pulses.
(11) Making the Inhibit function active (setting the INH pin to “H” from “L”) forces the watchdog timer to stop operation.
This stops only the watchdog timer, leaving the MB3793 monitoring V CC (operations (8) to (10)).
The watchdog timer remains inactive unless the Inhibit function pin input is canceled.
The inhibit function (INH) pin must be connecting a voltage of lower as possible impedance, to evade noise.
Set the input pulse time width for Inhibit function (time of “L” level or “H” level) longer than the watchdog timer monitoring time
(tWD).
(12) Canceling the inhibit input (setting the INH pin to “L” from “H”) restarts the watchdog timer.
(13) The reset signal is output when the power supply is turned off to set VCC to VSL or less.
1. Equation of time-setting capacitances (CTP and CTW) and set time
tPR [ms] ≈ A
CTP [F]
tWD [ms] ≈ B
CTW [F]
tWR [ms] ≈ D
CT P [ F ]
Values of A, B and D
A
B
D
Remark
1300
1500
100
VCC = 5.0 V
Note: The width of value of tPR, tWD and tWR becomes the same ratio as width (Min, Max) of each
specification value.
2. Example (when CTP = 0.1 F and CTW = 0.01 F)
time
(m s )
Document Number: 002-08399 Rev *C
Symbol
VCC = 5.0 V
tPR
130
tWD
15
tWR
10
Page 15 of 24
MB3793-34D/37D/40D/42D/45D
10. Typical Characteristics
ICC - VCC characteristics
(MB3793-34D)
VSH, VSL - Ta characteristics
(MB3793-34D)
3.7
MB3793
VCC
3.6
fCK = 1 kHz, Duty 10 %
VL 0 V/VH VCC
CTW 0.01 F, CTP 0.1 F
Detection voltage
VSH and VSL (V)
Power supply current ICC ( A)
VINH
45
Watchdog timer operating
(VINH = 0 V)
40
VSH
3.5
3.4
VSL
35
30
3.3
25
20
0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
3.2
-40
8.0
Power supply voltage VCC (V)
-20
0
+20 +40 +60 +80 +100 +120
Operating ambient temperature Ta (°C)
V/RESET - VCC characteristics
V /RESET - I /RESET characteristics
(N-MOS side)
(MB3793-34D)
0.6
7
Pull-up resistor: 470 k
6
0.5
Reset output voltage
V/RESET (V)
Reset output voltage
V /RESET (V)
5
0.4
Ta = +25 °C
0.3
Ta = +85 °C
0.2
4
3
Ta = +85 °C
2
Ta = +25 °C
0.1
1
Ta = -40 °C
Ta = -40 °C
0
0
0
1
2
3
4
5
6
7
8
9
Reset output current I /RESET (mA)
Document Number: 002-08399 Rev *C
10
0
1
2
3
4
5
6
7
Power supply voltage VCC (V)
Page 16 of 24
MB3793-34D/37D/40D/42D/45D
V/RESET - VCC characteristics
(MB3793-45D)
tPR - Ta characteristics
260
7
Pull-up resistor: 470 k
240
6
at VCC = 5.0 V
220
Power-on reset hold time
tPR (ms)
200
Reset output voltage
V/RESET (V)
5
4
3
Ta = +85 °C
2
Ta = +25 °C
180
160
140
120
100
80
60
1
40
Ta = -40 °C
20
0
0
1
2
3
4
5
6
0
-40
7
Power supply voltage VCC (V)
tWR - Ta characteristics
22
20
20
18
16
14
12
10
8
6
at VCC = 5.0 V
24
Watchdog timer monitoring time
tWD (ms)
Watchdog timer reset time
tWR (ms)
+20 +40 +60 +80 +100 +120
26
at VCC = 5.0 V
22
18
16
14
12
10
8
6
4
4
2
2
0
-40
0
tWD - Ta characteristics
26
24
-20
Operating ambient temperature Ta (°C)
0
-20
0
+20 +40 +60 +80 +100 +120
Operating ambient temperature Ta (°C)
Document Number: 002-08399 Rev *C
-40
-20
0
+20 +40 +60 +80 +100 +120
Operating ambient temperature Ta (°C)
Page 17 of 24
MB3793-34D/37D/40D/42D/45D
tWR - CTP characteristics
104
103
Watchdog timer reset time
tWR (ms)
Power-on reset hold time
tPR (ms)
tPR - CTP characteristics
Ta −40 C
102
Ta 25 C
101
Ta 85 C
1
10 −1
10−4
10−3
10−2
10−1
101
1
102
Power-on reset hold time setting capacitance
CTP (F)
103
102
Ta −40 C
101
1
Ta 25 C
Ta 85 C
10−1
10−2
10−4
10−3
10−2
10−1
1
101
102
Power-on reset hold time setting capacitance
CTP (F)
Watchdog timer monitoring time
tWD (ms)
tWD - CTW characteristics
103
Ta −40 C
102
Ta 25 C
101
1
Ta 85 C
−1
10
CTP = 0.01 F
10−5
10−4
10−3
10−2
10−1
1
101
Watchdog timer monitoring time setting capacitance
CTW (F)
Document Number: 002-08399 Rev *C
Page 18 of 24
MB3793-34D/37D/40D/42D/45D
11. Application Example
Power supply Voltage Monitor and Watchdog Timer
1. 1-clock monitor
VCC1
VCC2
5
VCC
2 CTW
/RESET 1
MB3793
VCC
/RESET
CTW*
CTP*
3 CTP
CK1 8
Microcontroller
CK
6 INH
GND
4
CK2 7
GND
GND
* : Use a capacitor with less leakage current.
2. 2-clock monitor
VCC2
VCC1
5
VCC
2 CTW
/RESET 1
/RESET
MB3793
CTW*
CTP*
3 CTP
CK1 8
Microcontroller1
CK
GND
4
/RESET
VCC
Microcontroller2
CK
GND
6 INH
VCC
GND
CK2 7
GND
* : Use a capacitor with less leakage current.
Document Number: 002-08399 Rev *C
Page 19 of 24
MB3793-34D/37D/40D/42D/45D
Power Supply Voltage Monitor and Watchdog Timer Stop
VCC1
VCC2
5
VCC
2 CTW
/RESET 1
/RESET
MB3793
VCC
Microcontroller1
CTW* CTP*
3 CTP
HALT
CK
CK1 8
GND
6 INH
GND
4
/RESET
VCC
Microcontroller2
CK
HALT
GND
CK2 7
GND
* : Use a capacitor with less leakage current.
Setting of Compulsory Reset
VCC1
VCC2
5
VCC
2 CTW
10 k
/RESET 1
MB3793
RESIN
/RESET
CTW*
CTP*
3 CTP
CK1 8
VCC
Microcontroller
CK
6 INH
GND
4
CK2 7
GND
GND
* : Use a capacitor with less leakage current.
It is possible for the /RESET pin to fix to “L” if the CTP pin is short-circuited to GND.
Take care not to change the value of the CTP capacity because of the influence of Tr that
is used at the time.
Document Number: 002-08399 Rev *C
Page 20 of 24
MB3793-34D/37D/40D/42D/45D
12. Usage Precaution
Do not Configure the IC Over the Maximum Ratings
If the IC is used over the maximum ratings, the LSI may be permanently damaged.
It is preferable for the device to normally operate within the recommended usage conditions. Usage outside of these conditions
can have a bad effect on the reliability of the LSI.
Use the Devices within Recommended Operating Conditions
The recommended operating conditions are the recommended values that guarantee the normal operations of LSI.
The electrical ratings are guaranteed when the device is used within the recommended operating conditions and under the
conditions stated for each item.
Printed Circuit Board Ground Lines Should be Set up with Consideration for Common Impedance
Take Appropriate Measures Against Static Electricity
•
•
•
•
Containers for semiconductor materials should have anti-static protection or be made of conductive material.
After mounting, printed circuit boards should be stored and shipped in conductive bags or containers.
Work platforms, tools, and instruments should be properly grounded.
Working personnel should be grounded with resistance of 250 k to 1 M in series between body and ground.
Do not Apply Negative Voltages
The use of negative voltages below –0.3 V may create parasitic transistors on LSI lines, which can cause malfunctions.
13. Ordering Information
Part Number
MB3793-34DPNF
MB3793-37DPNF
MB3793-40DPNF
MB3793-42DPNF
MB3793-45DPNF
Package
8-pin plastic SOP
(SOB008)
8-pin plastic SOP
(SOB008)
8-pin plastic SOP
(SOB008)
8-pin plastic SOP
(SOB008)
8-pin plastic SOP
(SOB008)
14. RoHS Compliance Information
The LSI products of Cypress with “E1” are compliant with RoHS Directive, and have observed the standard of lead, cadmium,
mercury, Hexavalent chromium, polybrominated biphenyls (PBB), and polybrominated diphenyl ethers (PBDE).
The product that conforms to this standard is added “E1” at the end of the part number.
Document Number: 002-08399 Rev *C
Page 21 of 24
MB3793-34D/37D/40D/42D/45D
15. Package Dimensions
Package Code: SOB008
002-15856 Rev. **
Document Number: 002-08399 Rev *C
Page 22 of 24
MB3793-34D/37D/40D/42D/45D
16. Major Changes
Spansion Publication Number: DS405-00011
Page
Section
Change Results
Revision 1.0
-
-
Initial release
Revision 2.0 (12/08/2014)
-
-
1pin name is changed to /RESET
24
16. ORDERING INFORMATION
25 to 27
18. LABELING SAMPLE
Labeling sample is changed
32
21. PACKAGE DIMENSIONS
FPT-8P-M03 package information is deleted
MB3793-34DPFV/ MB3793-37DPFV/ MB3793-40DPFV/ MB3793-42DPFV/
MB3793-45DPFV ordering part number is deleted
NOTE: Please see “Document History” about later revised information.
Document History
Document Title: MB3793-34D/37D/40D/42D/45D Power-Voltage Monitoring IC with Watchdog Timer
Document Number: 002-08399
Orig. of
Submission
Change
Date
-
TAOA
12/08/2014
5131436
TAOA
02/18/2016 Updated to Cypress template
Revision
ECN
**
*A
Description of Change
Migrated to Cypress and assigned document number 002-08399.
No change to document contents or format.
Updated Pin Description:
Change the package name from FPT-8P-M02 to SOB008
Updated description in the 4. Block Functions Output circuit
Updated Ordering Information:
*B
5623700
HIXT
02/09/2017
Change the package name from FPT-8P-M02 to SOB008
Updated Package Dimensions: Updated to Cypress format
Deleted “Marking Format”
Deleted “Labeling Sample”
Deleted “MB3793-34D/37D/40D/42D/45D Recommended Conditions of
Moisture Sensitivity”
*C
5787039
MASG
Document Number: 002-08399 Rev *C
06/27/2017 Adapted Cypress new logo.
Page 23 of 24
MB3793-34D/37D/40D/42D/45D
Sales, Solutions, and Legal Information
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© Cypress Semiconductor Corporation, 2014-2017. This document is the property of Cypress Semiconductor Corporation and its subsidiaries, including Spansion LLC (“Cypress”). This document,
including any software or firmware included or referenced in this document (“Software”), is owned by Cypress under the intellectual property laws and treaties of the United States and other countries
worldwide. Cypress reserves all rights under such laws and treaties and does not, except as specifically stated in this paragraph, grant any license under its patents, copyrights, trademarks, or
other intellectual property rights. If the Software is not accompanied by a license agreement and you do not otherwise have a written agreement with Cypress governing the use of the Software,
then Cypress hereby grants you a personal, non-exclusive, nontransferable license (without the right to sublicense) (1) under its copyright rights in the Software (a) for Software provided in source
code form, to modify and reproduce the Software solely for use with Cypress hardware products, only internally within your organization, and (b) to distribute the Software in binary code form
externally to end users (either directly or indirectly through resellers and distributors), solely for use on Cypress hardware product units, and (2) under those claims of Cypress’s patents that are
infringed by the Software (as provided by Cypress, unmodified) to make, use, distribute, and import the Software solely for use with Cypress hardware products. Any other use, reproduction,
modification, translation, or compilation of the Software is prohibited.
TO THE EXTENT PERMITTED BY APPLICABLE LAW, CYPRESS MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARD TO THIS DOCUMENT OR ANY SOFTWARE
OR ACCOMPANYING HARDWARE, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. To the extent
permitted by applicable law, Cypress reserves the right to make changes to this document without further notice. Cypress does not assume any liability arising out of the application or use of any
product or circuit described in this document. Any information provided in this document, including any sample design information or programming code, is provided only for reference purposes. It
is the responsibility of the user of this document to properly design, program, and test the functionality and safety of any application made of this information and any resulting product. Cypress
products are not designed, intended, or authorized for use as critical components in systems designed or intended for the operation of weapons, weapons systems, nuclear installations, life-support
devices or systems, other medical devices or systems (including resuscitation equipment and surgical implants), pollution control or hazardous substances management, or other uses where the
failure of the device or system could cause personal injury, death, or property damage (“Unintended Uses”). A critical component is any component of a device or system whose failure to perform
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Cypress, the Cypress logo, Spansion, the Spansion logo, and combinations thereof, WICED, PSoC, CapSense, EZ-USB, F-RAM, and Traveo are trademarks or registered trademarks of Cypress in
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Document Number: 002-08399 Rev *C
June 27, 2017
Page 24 of 24
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