MB3793-28A
Power-Voltage Monitoring IC
with Watchdog Timer Datasheet
Description
The MB3793 is an integrated circuit to monitor power voltage; it incorporates a watchdog timer. A reset signal is output when the
power is cut or falls abruptly. When the power recovers normally after resetting, a power-on reset signal is output to microprocessor
units (MPUs). An internal 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
MB3793-28A
3793AR
2.8 V
Features
■
Precise detection of power voltage fall: ±2.5%
■
Detection voltage with hysteresis
■
Low power dispersion: ICC = 41 μA (Typ)
■
Internal dual-input watchdog timer
■
Watchdog timer halt function
■
Independently-set watchdog and reset times
Application
■
Arcade Amusement
etc.
Cypress Semiconductor Corporation
Document Number: 002-08559 Rev. *C
•
198 Champion Court
•
San Jose, CA 95134-1709
•
408-943-2600
Revised June 22, 2017
MB3793-28A
Contents
Description ........................................................................ 1
Features ............................................................................. 1
Application ........................................................................ 1
Contents ............................................................................ 2
1. Pin Assignment ...................................................3
8.4 Inhibition operation (Positive clock pulse) ........... 11
8.5 Clock pulse input supplementation
(Positive clock pulse) ........................................................ 12
9. Operation Sequence .........................................13
3. Block Diagram .....................................................4
9.1 Positive clock pulse input .................................... 13
9.2 Negative clock pulse input ................................... 13
9.3 Single-clock input monitoring .............................. 13
9.4 Description of Operations .................................... 13
4. Block Functions ..................................................5
10. Typical Characteristics ..................................15
2. Pin Description ....................................................3
4.1 Comp. S ................................................................ 5
4.2 Output circuit ......................................................... 5
4.3 Pulse generator ..................................................... 5
4.4 Watchdog timer ..................................................... 5
4.5 Logic circuit ........................................................... 5
5. Absolute Maximum Ratings ...............................6
6. Recommended Operating ConditionS ..............6
7. Electrical Characteristics ...................................7
7.1 DC Characteristics ................................................ 7
7.2 AC Characteristics ................................................. 7
8. Timing Diagram ...................................................8
8.1 Basic operation (Positive clock pulse) .................. 8
8.2 Basic operation (Negative clock pulse) ................ 9
8.3 Single-clock input monitoring (Positive clock pulse) 10
Document Number: 002-08559 Rev. *C
11. Application Example .......................................18
11.1 Supply voltage monitor and watchdog timer ..... 18
11.2 Supply voltage monitor and watchdog timer stop 19
11.3 Setting of compulsory reset .............................. 19
12. Usage Precaution ............................................20
13. Ordering Information ......................................20
14. RoHS Compliance Information of Lead (Pb)
Free version ...........................................................20
15. Package Dimensions ......................................21
16. Document History ...........................................22
Sales, Solutions, and Legal Information ...................... 23
Page 2 of 23
MB3793-28A
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
Sets watchdog timer monitoring time pin
3
CTP
Sets power-on reset hold time pin
4
GND
Ground pin
5
VCC
Power supply pin
6
INH
This pin forces the watchdog timer on/off. When this pin is High level, the watchdog timer is stopped.
7
CK2
Inputs clock 2 pin
8
CK1
Inputs clock 1 pin
Document Number: 002-08559 Rev. *C
Description
Outputs reset pin
Page 3 of 23
MB3793-28A
3. Block Diagram
To VCC of all blocks
. 3 μA
I1 =
.
5 VCC
I2 .=. 30 μA
CTP 3
.
R1 =
.
315 kΩ
Logic circuit
RESET 1
Output circuit
INH 6
Comp.S
CTW 2
Watchdog
timer
−
Reference
voltage
generator
VS
+
Pulse generator 1
. 1.24 V
VREF =
.
CK1 8
R2 .=.
240 kΩ
Pulse generator 2
CK2 7
Document Number: 002-08559 Rev. *C
To GND of
all blocks
4 GND
Page 4 of 23
MB3793-28A
4. Block Functions
4.1 Comp. S
Comp. S is a comparator with hysteresis to compare the reference voltage with a voltage (VS) that is the result of dividing the power
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 μs when the power is cut or falls abruptly.
4.2 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.
Since the reset (RESET) output buffer has the CMOS organization, no pull-up resistor is needed.
4.3 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.
4.4 Watchdog Timer
The watchdog timer can monitor two clock pulses. Short-circuit the CK1 and CK2 clock pins to monitor a single clock pulse.
4.5 Logic Circuit
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: 002-08559 Rev. *C
Page 5 of 23
MB3793-28A
5. Absolute Maximum Ratings
Parameter
Power supply voltage*
Symbol
Conditions
Rating
Unit
Min
Max
−0.3
+7
V
−0.3
VCC + 0.3
( ≤ +7)
V
VCC
—
CK1
VCK1
—
CK2
VCK2
—
INH
VINH
—
VOL
VOH
—
−0.3
VCC + 0.3
( ≤ +7)
V
Reset output current
IOL
IOH
—
−10
+10
mA
Power dissipation
PD
Ta ≤ +85 ⋅C
200
mW
Tstg
—
−55
+125
°C
Input voltage*
Reset output voltage*
RESET
Storage temperature
* : The voltage is based on the ground voltage (0 V).
WARNING:
Semiconductor devices can be permanently damaged by application of stress (voltage, current, temperature, etc.)
in excess of absolute maximum ratings. Do not exceed these ratings.
6. Recommended Operating Conditions
Parameter
Symbol
Conditions
VCC
Value
Unit
Min
Typ
Max
—
1.2
3.3
4.0
IOL
—
0
—
IOH
—
−5
+5
—
0
Power-on reset hold time setting
capacity
CTP
—
0.001
0.1
10
μF
Watchdog-timer monitoring time
setting capacity*
CTW
—
0.001
0.01
1
μF
Operating ambient temperature
Ta
—
−40
+25
+85
°C
Power supply voltage
Reset (RESET) output current
V
mA
* : The watchdog timer monitor time range depends on the rating of the setting capacitor.
WARNING:
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 within these ranges.
Always use semiconductor devices within their recommended operating condition ranges. Operation
outside these ranges may adversely affect reliability and could result in device failure.
No warranty is made with respect to uses, operating conditions, or combinations not represented on the
data sheet. Users considering application outside the listed conditions are advised to contact their
representatives beforehand.
Document Number: 002-08559 Rev. *C
Page 6 of 23
MB3793-28A
7. Electrical Characteristics
7.1 DC Characteristics
(VCC = +3.3 V, Ta = +25°C)
Parameter
Symbol
Power current
Conditions
CK input threshold voltage
CK input hysteresis
INH input voltage
Input current
(CK1,CK2,INH)
Reset output voltage
Reset-output minimum power voltage
Unit
Min
Typ
Max
⎯
41
55
Ta = +25°C
2.73
2.80
2.87
Ta = −40 to +85°C
2.69*
2.80
2.91*
Ta = +25°C
2.80
2.87
2.94
Ta = −40 to +85°C
2.76*
2.87
2.98*
25
70
100
mV
0.7*
1.3
1.9
V
ICC1
After exit from reset
VSL
VCC falling
VSH
VCC rising
VSHYS
VSH - VSL
Detection voltage
Detection voltage hysteresis difference
Value
VCIH
⎯
μA
V
V
VCIL
⎯
0.5
1.0
1.5*
V
VCHYS
⎯
0.1*
0.3
0.6*
V
VIIH
⎯
2.2
⎯
VCC
V
VIIL
⎯
0
⎯
0.8
V
IIH
VIH = VCC
⎯
0
1.0
μA
IIL
VIL = 0 V
−1.0
0
⎯
μA
VOH
IRESET = −3 mA
2.8
3.1
⎯
V
VOL
IRESET = +3 mA
⎯
0.12
0.4
V
VCCL
IRESET = +50 μA
⎯
0.8
1.2
V
* : This parameter is guaranteed by design, which is not supported by a final test.
7.2 AC Characteristics
(VCC = +3.3 V, Ta = +25°C)
Parameter
Symbol
Conditions
Value
Min
Typ
Max
Unit
Power-on reset hold time
tPR
CTP = 0.1 μF
30
75
120
ms
Watchdog timer monitoring time
tWD
CTW = 0.01 μF,
CTP = 0.1 μF
8
16
24
ms
Watchdog timer reset time
tWR
CTP = 0.1 μF
2
5.5
9
ms
CK input pulse width
tCKW
⎯
500
⎯
⎯
ns
CK input pulse cycle
tCKT
⎯
20
⎯
⎯
μs
Reset (RESET) output transition time
Rising
tr*
CL = 50 pF
⎯
⎯
500
ns
Falling
tf*
CL = 50 pF
⎯
⎯
500
ns
*: The voltage range is 10% to 90% at testing the reset output transition time.
Document Number: 002-08559 Rev. *C
Page 7 of 23
MB3793-28A
8. Timing Diagram
8.1 Basic Operation (Positive Clock Pulse)
VSH
VSL
VCC
tCKW
CK1
tCKT
CK2
INH
Vth
CTP
VH
CTW
VL
RESET
tWD
tPR
(1) (2)
Document Number: 002-08559 Rev. *C
(3)
(4)(5) (5)
tPR
tWR
(6) (7)
(8) (9)
(10)
(11)
(12)
(13)
Page 8 of 23
MB3793-28A
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: 002-08559 Rev. *C
tWD
(3)
(4)(5) (5)
tPR
tWR
(6) (7)
(8) (9)
(10)
(11)
(12)
(13)
Page 9 of 23
MB3793-28A
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: 002-08559 Rev. *C
Page 10 of 23
MB3793-28A
8.4 Inhibition Operation (Positive Clock Pulse)
VSH
VSL
VCC
tCKW
CK1
tCKT
CK2
INH
Vth
CTP
VH
CTW
VL
RESET
tPR
(1) (2)
tWD
(3)
Document Number: 002-08559 Rev. *C
(4)(5) (5)
tPR
tWR
(6) (7)
(11) (8) (9)
(10)
(12)
(13)
Page 11 of 23
MB3793-28A
8.5 Clock Pulse Input Supplementation (Positive Clock Pulse)
tCKT
tCKW
*1
CK1
*2
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.
When two consecutive pulses occur on one side of this alternation before switching, the second
pulse is ignored.
In the above figure, pulse *1 and *2 are ignored.
Document Number: 002-08559 Rev. *C
Page 12 of 23
MB3793-28A
9. Operation Sequence
9.1 Positive Clock Pulse Input
Refer to “Basic Operation (Positive Clock Pulse)” under “Timing Diagram”.
9.2 Negative Clock Pulse Input
Refer to “Basic Operation (Negative Clock Pulse)” under “Timing Diagram”.
The MB3793 operates in the same way whether it inputs positive or negative pulses.
9.3 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.
Refer to “Single-clock Input Monitoring (Positive Clock Pulse)” under “Timing Diagram”.
9.4 Description of Operations
The numbers given to the following items correspond to numbers (1) to (13) used in “Timing Diagram”.
(1) The MB3793 outputs a reset signal when the 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. The VSH value is
2.87 V (Typ) .
(3) When CTP has been charged for a certain period of time TPR (until the CTP pin voltage exceeds the
threshold voltage (Vth) 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 2.4 V with VCC = 3.3 V
The power-on reset hold time tPR is set with the following equation:
tPR (ms) ≈ A × CTP (μF)
The value of A is about 750 with VCC = 3.3 V and about 700 with VCC = 3.0 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 CTW 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 (μF) + C × CTP (μF)
The value of B is hardly affected by the power supply voltage; it is about 1600 with VCC = 3.0 V to 3.3 V.
The value of C is 0.
For this reason:
tWD (ms) ≈ B × CTW (μF)
Document Number: 002-08559 Rev. *C
Page 13 of 23
MB3793-28A
(7) When a certain period of time tWR has passed (until the CTP pin voltage reaches or exceeds Vth 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 (μF)
The value of D is 55 with VCC = 3.3 V and about 50 with VCC = 3.0 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).
The value of VSL is 2.80 V (Typ) .
(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 pin 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 VCC (operations (8) to (10)).
The watchdog timer remains inactive unless the inhibit input is canceled.
The inhibition (INH) pin must be connecting a voltage of more low impedance, to evade of the noise.
(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 [μF]
tWD [ms] ≈ B × CTW [μF] + C × CTP [μF]
However, when CTP/CTW ≈ 10 or less, tWD [ms] ≈ B× CTW [μF]
tWR [ms] ≈ D × CTP [μF]
Values of A, B, C, and D
A
B
C
D
Remark
750
1600
0
55
VCC = 3.3 V
700
1600
0
50
VCC = 3.0 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 μF and CTW = 0.01 μF)
time
(ms)
Document Number: 002-08559 Rev. *C
Symbol
VCC = 3.3 V
VCC = 3.0 V
tPR
75
70
tWD
16
16
tWR
5.5
5
Page 14 of 23
MB3793-28A
10. Typical Characteristics
ICC - VCC characteristics
VSH, VSL - Ta characteristics
3.1
MB3793
VINH
VCC
fCK= 1 kHz, Duty = 10%
VL = 0 V/VH = VCC
CTW = 0.01 μF, CTP = 0.1 μF
45
Detection voltage
VSH and VSL (V)
Power current
ICC (μA)
3.0
Watchdog timer monitoring
(VINH = 0 V)
40
2.9
VSH
2.8
VSL
35
30
2.7
25
20
0
1.0
2.0
3.0
2.6
-40
4.0
-20
0
+20 +40 +60 +80 +100 +120
Operating ambient temperature Ta (°C)
Power voltage VCC (V)
V RESET - I RESET characteristics
(N-MOS side)
V RESET - I RESET characteristics
(P-MOS side)
3.3
600
at VCC = 3.3 V
at VCC = 3.3 V
3.2
Ta = +85 °C
500
3.1
Ta = −40 °C
400
Reset output voltage
V RESET (V)
Reset output voltage
V RESET (V)
3.0
2.9
2.8
Ta = +25 °C
2.7
2.6
2.5
Ta = +25 °C
300
200
Ta = −40 °C
100
Ta = +85 °C
2.4
0
2.3
0
−1 −2 −3 −4 −5 −6 −7 −8 −9 −10
Reset output current I RESET (mA)
0
1
2
3
4
5
6
7
8
9
10
Reset output current I RESET(mA)
(Continued)
Document Number: 002-08559 Rev. *C
Page 15 of 23
MB3793-28A
(Continued)
tPR - Ta characteristics
VRESET - VCC characteristics
160
7
Pull-up resistance : 100 kΩ
at VCC = 3.3 V
140
Power-on reset hold time
tPR (ms)
Reset output voltage
VRESET (V)
6
5
4
3
Ta = +85 °C
2
120
100
80
60
40
Ta = +25 °C
1
20
Ta = -40 °C
0
0
1
2
3
0
-40
4
-20
0
+20 +40 +60 +80 +100 +120
Operating ambient temperature Ta (°C)
Power voltage VCC (V)
tWR - Ta characteristics
tWD - Ta characteristics
16
26
at VCC = 3.3 V
24
at VCC = 3.3 V
14
Watchdog timer monitoring time
tWD (ms)
22
Watchdog timer reset time
tWR (ms)
12
10
8
6
4
20
18
16
14
12
10
8
6
4
2
2
0
−40 −20
0
+20 +40 +60 +80 +100 +120
Operating ambient temperature Ta (°C)
Document Number: 002-08559 Rev. *C
0
−40 −20
0
+20 +40 +60 +80 +100 +120
Operating ambient temperature Ta (°C)
Page 16 of 23
MB3793-28A
(Continued)
tPR - CTP characteristics
tWR - CTP characteristics
at VCC = 3.3 V
104
103
Watchdog timer reset time
tWR (ms)
Power-on reset hold time
tPR (ms)
at VCC = 3.3 V
Ta = −40 °C
102
Ta = +25 °C
101
Ta = +85 °C
1
10 −1
10−4
10−3
10−2
10−1
1
101
102
Power-on reset hold time setting capacitance
CTP (μF)
103
102
Ta = −40 °C
101
1
Ta = +25 °C
10−1
Ta = +85 °C
10−2
10−4
10−3
10−2
10−1
1
101
102
Power-on reset hold time setting capacitance
CTP (μF)
Watchdog timer monitoring time
tWD (ms)
tWD - CTW characteristics
at VCC = 3.3 V
103
Ta = −40 °C
102
101
Ta = +25 °C
1
Ta = +85 °C
10−1
10−5
10−4
10−3
10−2
10−1
1
101
Watchdog timer monitoring time setting capacitance
CTW (μF)
Document Number: 002-08559 Rev. *C
Page 17 of 23
MB3793-28A
11. Application Example
11.1 Supply Voltage Monitor and Watchdog Timer
11.1.1 1-clock monitor
VCC
5
VCC
2 CTW
RESET 1
MB3793
RESET
CTW*
3 CTP
CTP*
CK1 8
VCC
Microprocessor
CK
6 INH
GND
4
CK2 7
GND
GND
* : Use a capacitor with less leakage current.
11.1.2 2-clock monitor
VCC
5
VCC
2 CTW
RESET 1
RESET
MB3793
CTW*
CTP*
3 CTP
CK1 8
GND
RESET
VCC
Microprocessor1
Microprocessor2
CK
CK
GND
6 INH
VCC
GND
CK2 7
4
GND
* : Use a capacitor with less leakage current.
Document Number: 002-08559 Rev. *C
Page 18 of 23
MB3793-28A
11.2 Supply Voltage Monitor and Watchdog Timer Stop
VCC
2 CTW
5
VCC
RESET 1
RESET
MB3793
3 CTP
CK1 8
CTW* CTP*
GND
6 INH
VCC
RESET
VCC
Microprocessor1
HALT
CK
Microprocessor2
CK
HALT
GND
GND
CK2 7
4
GND
* : Use a capacitor with less leakage current.
11.3 Setting of Compulsory Reset
VCC
5
VCC
2 CTW
10 kΩ
RESET 1
MB3793
RESIN
RESET
CTW*
CTP*
3 CTP
CK1 8
VCC
Microprocessor
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: 002-08559 Rev. *C
Page 19 of 23
MB3793-28A
12. Usage Precaution
1.
Do not Configure the IC Over the Maximum Ratings
If the lC is used over the maximum ratings, the LSl 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.
2.
Use the Devices within Recommended Operating Conditions
The recommended operating conditions are under which the LSl is guaranteed to operate.
The electrical ratings are guaranteed when the device is used within the recommended operating conditions and
under the conditions stated for each item.
3.
Printed Circuit Board Ground Lines Should be Set up with Consideration for Common Impedance
4.
Take Appropriate Measures Against Static Electricity
•
•
•
•
5.
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 kΩ to 1 MΩ 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
MB3793-28APNF
Package
Remarks
8-pin plastic SOP
(SOB008)
–
14. RoHS Compliance Information of Lead (Pb) Free version
The LSI products of Fujitsu Microelectronics with “E1” are compliant with RoHS Directive , and has 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: 002-08559 Rev. *C
Page 20 of 23
MB3793-28A
15. Package Dimensions
Package Code: SOB008
0.45
0.52
0.60
0.75
L 2
0.25 BSC
1.27 BSC.
h
0.40 BSC.
002-15856 Rev. **
11. JEDEC SPECIFICATION NO. REF : N/A
Page 21 of 23
Document Number: 002-08559 Rev. *C
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8
SIDE VIEW
L2
A
ș
GAUGE
PLANE
㻯
BOTTOM VIEW
SIDE VIEW
5
45°
E1 E
A'
e
SECTION A-A'
C A-B D
0.13
b
h
DIMENSIONS
0.25 H D
;
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4
L
L1
10
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0.25 H D
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MIN.
DETAIL A
A2
A
5
㻭
0.20 C A-B D
㻮
㻰
D
4
INDEX AREA
TOP VIEW
DETAIL A
MB3793-28A
16. Document History
Document Title: MB3793-28A Power-Voltage Monitoring IC with Watchdog Timer Datasheet
Document Number: 002-08559
Revision
ECN
Orig. of
Change
Submission
Date
**
−
TAOA
12/03/2009
Migrated to Cypress and assigned document number 002-08559.
No change to document contents or format.
*A
5186892
TAOA
03/31/2016
Updated to Cypress template
Description of Change
*B
5606220
HIXT
02/07/2017
Updated Pin Assignment: Change the package name from FPT-8P-M01 to SOE008
Updated Ordering Information: Change the package name from FPT-8P-M01 to SOE008
Updated Package Dimensions: Updated to Cypress format
Deleted “Marking Format (Lead Free version)”
Deleted “Labeling Sample (Lead free version)”
Deleted “MB3793-28APNF Recommended Conditions of Moisture Sensitivity Level”
*C
5782377
MASG
06/22/2017
Adapted Cypress new logo.
Document Number: 002-08559 Rev. *C
Page 22 of 23
MB3793-28A
Sales, Solutions, and Legal Information
Worldwide Sales and Design Support
Cypress maintains a worldwide network of offices, solution centers, manufacturer’s representatives, and distributors. To find the office
closest to you, visit us at Cypress Locations.
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Products
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cypress.com/interface
cypress.com/iot
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cypress.com/mcu
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cypress.com/psoc
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cypress.com/pmic
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PSoC 1 | PSoC 3 | PSoC 4 | PSoC 5LP | PSoC 6
Cypress Developer Community
Forums | WICED IOT Forums | Projects | Video | Blogs | Training
| Components
Technical Support
cypress.com/support
cypress.com/touch
cypress.com/usb
cypress.com/wireless
© Cypress Semiconductor Corporation, 2009-2017. 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
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Document Number: 002-08559 Rev. *C
Revised June 22, 2017
Page 23 of 23