ON N84C163WD25TG Supervisory circuits with i2c serial cmos eeprom precision reset controller Datasheet

N84C163
Product Preview
Supervisory Circuits with
I2C Serial CMOS EEPROM,
Precision Reset Controller
and Watchdog Timer (16K)
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Description
The N84C163 is a complete memory and supervisory solution for
microcontroller−based systems. A serial EEPROM memory (16K)
with hardware memory write protection, a system power supervisor
with brown out protection and a watchdog timer are integrated
together in low power CMOS technology. Memory interface is via an
I2C bus.
The 1.6−second watchdog circuit returns a system to a known good
state if a software or hardware glitch halts or “hangs” the system. The
N84C163 watchdog monitors the WDI input pin.
The power supply monitor and reset circuit protects memory and
system controllers during power up/down and against brownout
conditions. Five reset threshold voltages support 5 V, 3.3 V and 3 V
systems. If power supply voltages are out of tolerance reset signals
become active, preventing the system microcontroller, ASIC or
peripherals from operating. Reset signals become inactive typically
200 ms after the supply voltage exceeds the reset threshold level. With
both active high and low reset signals, interface to microcontrollers
and other ICs is simple. In addition, a reset pin can be used as a
debounced input for pushbutton manual reset capability.
The N84C163 memory features a 16−byte page. In addition,
hardware data protection is provided by a write protect pin WP and by
a VCC sense circuit that prevents writes to memory whenever VCC falls
below the reset threshold or until VCC reaches the reset threshold
during power up.
This device is available in a green SOIC−8 package.
Features
•
•
•
•
•
•
•
•
•
SOIC−8
CASE 751BD
PIN CONFIGURATION
SOIC 8 Lead
WDI
1
RESET
2
WP
GND
VCC
7
RESET
3
6
SCL
4
5
SDA
N84C163
PIN FUNCTIONS
Pin Name
WDI
Function
Watchdog Timer Input
RESET
WP
Active Low Reset I/O
Write Protect
GND
Ground
SDA
Serial Data/Address
SCL
Watchdog Timer Input (WDI)
400 kHz I2C Bus Compatible
2.7 V to 6.0 V Operation
Low Power CMOS Technology
16−Byte Page Write Buffer
Built−in Inadvertent Write Protection
♦ VCC Lock Out
♦ Write Protection Pin, WP
Active High or Low Reset
♦ Precision Power Supply Voltage Monitor
♦ 5 V, 3.3 V and 3 V Systems
♦ Five Threshold Voltage Options
1,000,000 Program/Erase Cycles
Manual Reset
8
Clock Input
RESET
VCC
Active High Reset I/O
Power Supply
ORDERING INFORMATION
For Ordering Information details, see page 10.
•
•
•
•
100 Year Data Retention
8−Pin SOIC Package
Commercial and Industrial Temperature Ranges
These Devices are Pb−Free, Halogen Free/BFR Free
and are RoHS Compliant
This document contains information on a product under development. ON Semiconductor
reserves the right to change or discontinue this product without notice.
© Semiconductor Components Industries, LLC, 2016
September, 2016 − Rev. P0
1
Publication Order Number:
N84C163/D
N84C163
Table 1. RESET THRESHOLD OPTION
Part Dash
Number
Minimum
Threshold
Maximum
Threshold
−45
4.50
4.75
−42
4.25
4.50
−30
3.00
3.15
−28
2.85
3.00
−25
2.55
2.70
BLOCK DIAGRAM
EXTERNAL LOAD
SENSEAMPS
SHIFT REGISTERS
D OUT
ACK
V CC
GND
SDA
WORDADDRESS
BUFFERS
COLUMN
DECODERS
START/STOP
LOGIC
XDEC
WP
16K
EEPROM
CONTROL
LOGIC
DATA IN STORAGE
HIGHVOLTAGE/
TIMING CONTROL
RESET Controller
WATCHDOG
Precision
Vcc Monitor
WDI
RESET RESET
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2
STATE COUNTERS
SLAVE
ADDRESS
COMPARATORS
SCL
N84C163
SPECIFICATIONS
Table 2. ABSOLUTE MAXIMUM RATINGS
Parameters
Ratings
Units
Temperature Under Bias
–55 to +125
°C
Storage Temperature
–65 to +150
°C
−2.0 to VCC + 2.0
V
Voltage on any Pin with Respect to Ground (Note 1)
VCC with Respect to Ground
−2.0 to 7.0
V
Package Power Dissipation Capability (TA = 25°C)
1.0
W
Lead Soldering Temperature (10 seconds)
300
°C
Output Short Circuit Current (Note 2)
100
mA
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality
should not be assumed, damage may occur and reliability may be affected.
1. The minimum DC input voltage is –0.5 V. During transitions, inputs may undershoot to –2.0 V for periods of less than 20 ns. Maximum
DC voltage on output pins is VCC +0.5 V, which may overshoot to VCC +2.0 V for periods of less than 20 ns.
2. Output shorted for no more than one second. No more than one output shorted at a time.
Table 3. RELIABILITY CHARACTERISTICS
Symbol
Reference Test Method
Min
Endurance
MIL−STD−883, Test Method 1033
1,000,000
Cycles/Byte
TDR (Note 3)
Data Retention
MIL−STD−883, Test Method 1008
100
Years
VZAP (Note 3)
ESD Susceptibility
MIL−STD−883, Test Method 3015
2000
Volts
JEDEC Standard 17
100
mA
NEND (Note 3)
ILTH (Notes 3 & 4)
Parameter
Latch−Up
Max
Units
3. This parameter is tested initially and after a design or process change that affects the parameter.
4. Latch−up protection is provided for stresses up to 100 mA on address and data pins from –1 V to VCC +1 V.
Table 4. D.C. OPERATING CHARACTERISTICS
VCC = 2.7 V to 6.0 V, unless otherwise specified.
Parameter
Symbol
Test Conditions
Min
Typ
Max
Units
0.5
mA
ICC:R
Read Power Supply Current
fSCL = 400 kHz
ICC:W
Write Power Supply Current
Write Cycle
1
mA
ISB
Standby Current
VCC = 3.3 V
40
mA
VCC = 5 V
50
mA
ILI
Input Leakage Current
VIN = GND or VCC
2
mA
ILO
Output Leakage Current
VIN = GND or VCC
10
mA
VIL
Input Low Voltage
−1
VCC x 0.3
V
VIH
Input High Voltage
VCC x 0.7
VCC + 0.5
V
0.4
V
VOL1
Output Low Voltage (SDA)
IOL = 3 mA, VCC = 3.0 V
Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product
performance may not be indicated by the Electrical Characteristics if operated under different conditions.
Table 5. CAPACITANCE
TA = 25°C, f = 1.0 MHz, VCC = 5 V
Test
Symbol
Test Conditions
Max
Units
CI/O (Note 3)
Input/Output Capacitance (SDA)
VI/O = 0 V
8
pF
CIN (Note 3)
Input Capacitance (SCL)
VIN = 0 V
6
pF
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N84C163
Table 6. AC CHARACTERISTICS
VCC = 2.7 V to 6.0 V unless otherwise specified. Output Load is TTL Gate and 100 pF.
VCC = 2.7 V − 6 V
Symbol
FSCL
T1 (Note 1)
tAA
tBUF (Note 1)
Min
Parameter
Max
VCC = 4.5 V − 5.5 V
Min
Max
Units
Clock Frequency
100
400
kHz
Noise Suppression Time Constant at SCL, SDA Inputs
200
200
ns
SCL Low to SDA Data Out and ACK Out
3.5
1
ms
Time the Bus must be Free Before a New Transmission Can Start
4.7
1.2
ms
4
0.6
ms
tLOW
Clock Low Period
4.7
1.2
ms
tHIGH
Clock High Period
4
0.6
ms
4.7
0.6
ms
tHD; STA
Start Condition Hold Time
tSU; STA
Start Condition Setup Time (for a Repeated Start Condition)
tHD; DAT
Data in Hold Time
0
0
ns
tSU; DAT
Data in Setup Time
50
50
ns
tR (Note 1)
SDA and SCL Rise Time
tF (Note 1)
SDA and SCL Fall Time
tSU; STO
tDH
1
300
Stop Condition Setup Time
Data Out Hold Time
0.3
ms
300
ns
4
0.6
ms
100
100
ns
1. This parameter is tested initially and after a design or process change that affects the parameter.
Table 7. POWER−UP TIMING (Notes 1 and 2)
Symbol
Parameter
Min
Typ
Max
Units
tPUR
Power−up to Read Operation
1
ms
tPUW
Power−up to Write Operation
1
ms
Max
Units
10
ms
2. tPUR and tPUW are the delays required from the time VCC is stable until the specific operation can be initiated.
Table 8. WRITE CYCLE LIMITS
Symbol
tWR
Parameter
Min
Typ
Write Cycle Time
* The write cycle time is the time from a valid stop condition of a write sequence to the end of the internal program/erase cycle. During the write
cycle, the bus interface circuits are disabled, SDA is allowed to remain high, and the device does not respond to its slave address.
Table 9. RESET CIRCUIT CHARACTERISTICS
Symbol
tGLITCH
VRT
Parameter
Reset Threshold Hysteresis
VOHRS
Reset Output High Voltage
Units
100
ns
mV
0.4
VCC − 0.75
4.50
4.75
Reset Threshold (VCC = 5 V), (N84C163−42)
4.25
4.50
Reset Threshold (VCC = 3.3 V), (N84C163−30)
3.00
3.15
Reset Threshold (VCC = 3.3 V), (N84C163−28)
2.85
3.00
Reset Threshold (VCC = 3 V), (N84C163−25)
2.55
2.70
Power−Up Reset Timeout
130
Watchdog Period
tRPD
VTH to RESET Output Delay
270
1.6
1
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4
V
ms
s
5
RESET Output Valid
V
V
Reset Threshold (VCC = 5 V), (N84C163−45)
tWP
VRVALID
Max
15
Reset Output Low Voltage (IOLRS = 1 mA)
tPURST
Typ
Glitch Reject Pulse Width
VOLRS
VTH
Min
ms
V
N84C163
PIN DESCRIPTION
will initiate and maintain a reset condition. The RESET pin
must be connected through a pulldown resistor, and the
RESET pin must be connected through a pull−up resistor.
SDA: SERIAL DATA ADDRESS
The bidirectional serial data/address pin is used to transfer
all data into and out of the device. The SDA pin is an open
drain output and can be wire−ORed with other open drain or
open collector outputs.
SCL: Serial Clock
Serial clock input.
WDI: WATCHDOG INPUT
If there is no transition on the WDI for more than
1.6 seconds, the watchdog timer times out.
WP: WRITE PROTECT
If the pin is tied to VCC the entire memory array becomes
Write Protected (READ only). When the pin is tied to GND
or left floating normal read/write operations are allowed to
the device.
RESET/RESET: RESET I/O
These are open drain pins and can be used as reset trigger
inputs. By forcing a reset condition on the pins the device
DEVICE OPERATION
Reset Controller Description
RESET input in the N84C163 will initiate a reset timeout
after detecting a low to high transition and the RESET input
in the N84C163 will initiate a reset timeout after detecting
a high to low transition.
The N84C163 precision RESET controller ensures
correct system operation during brownout and power
up/down conditions. It is configured with open drain
RESET outputs. During power−up, the RESET outputs
remain active until VCC reaches the VTH threshold and will
continue driving the outputs for approximately 200 ms
(tPURST) after reaching VTH. After the tPURST timeout
interval, the device will cease to drive the reset outputs. At
this point the reset outputs will be pulled up or down by their
respective pull up/down resistors. During power−down, the
RESET outputs will be active when VCC falls below VTH.
The RESET outputs will be valid so long as VCC is > 1.0 V
(VRVALID).
The RESET pins are I/Os; therefore, the N84C163 can act
as a signal conditioning circuit for an externally applied
manual reset. The inputs are edge triggered; that is, the
Watchdog Timer
The Watchdog Timer provides an independent protection
for microcontrollers. During a system failure, the N84C163
will respond with a reset signal after a time−out interval of
1.6 seconds for a lack of activity. The N84C163 is designed
with the Watchdog Timer feature on the WDI input. If the
microcontroller does not toggle the WDI input pin within 1.6
seconds, the Watchdog Timer times out. This will generate
a reset condition on reset outputs. The Watchdog Timer is
cleared by any transition on WDI.
As long as the reset signal is asserted, the Watchdog Timer
will not count and will stay cleared.
t
GLITCH
VTH
VRVALID
VCC
t PURST
t RPD
t PURST
RESET
t RPD
RESET
Figure 1. RESET Output Timing
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N84C163
Hardware Data Protection
down) VTH or until VCC reaches the reset threshold
(power up) VTH. Any attempt to access the
internal EEPROM is not recognized and an ACK
will not be sent on the SDA line when RESET or
RESET is active.
The N84C163 is designed with the following hardware
data protection features to provide a high degree of data
integrity.
1. The N84C163 features a WP pin. When the WP
pin is tied high the entire memory array becomes
write protected (read only).
2. The VCC sense provides write protection when
VCC falls below the reset threshold value (VTH).
The VCC lock out inhibits writes to the serial
EEPROM whenever VCC falls below (power
Reset Threshold Voltage
The N84C163 is offered with five reset threshold voltage
ranges. They are 4.50 ÷ 4.75 V, 4.25 ÷ 4.50 V, 3.00 ÷ 3.15 V,
2.85 ÷ 3.00 V and 2.55 ÷ 2.70 V.
tHIGH
tF
tLOW
tR
tLOW
SCL
tSU:STA
tHD:DAT
tHD:STA
tSU:DAT
tSU:STO
SDA IN
tAA
tBUF
tDH
SDA OUT
Figure 2. Bus Timing
SCL
SDA
8TH BIT
ACK
BYTE n
tWR
STOP
CONDITION
START
CONDITION
Figure 3. Write Cycle Timing
SDA
SCL
START BIT
STOP BIT
Figure 4. Start/Stop Timing
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ADDRESS
N84C163
FUCTIONAL DESCRIPTION
The N84C163 supports the I2C Bus data transmission
protocol. This Inter−Integrated Circuit Bus protocol defines
any device that sends data to the bus to be a transmitter and
any device receiving data to be a receiver. The transfer is
controlled by the Master device which generates the serial
clock and all START and STOP conditions for bus access.
Both the Master device and Slave device can operate as
either transmitter or receiver, but the Master device controls
which mode is activated.
STOP Condition
A LOW to HIGH transition of SDA when SCL is HIGH
determines the STOP condition. All operations must end
with a STOP condition.
Device Addressing
The Master begins a transmission by sending a START
condition. The Master sends the address of the particular
slave device it is requesting. The four most significant bits
of the 8−bit slave address are fixed as 1010.
The next three bits (Figure 6) define memory addressing.
For the N84C163 the three bits define higher order bits.
The last bit of the slave address specifies whether a Read
or Write operation is to be performed. When this bit is set to
1, a Read operation is selected, and when set to 0, a Write
operation is selected.
After the Master sends a START condition and the slave
address byte, the N84C163 monitors the bus and responds
with an acknowledge (on the SDA line) when its address
matches the transmitted slave address. The N84C163 then
performs a Read or Write operation depending on the
R/W bit.
I2C Bus Protocol
The features of the I2C bus protocol are defined as
follows:
1. Data transfer may be initiated only when the bus is
not busy.
2. During a data transfer, the data line must remain
stable whenever the clock line is high. Any
changes in the data line while the clock line is high
will be interpreted as a START or STOP condition.
START Condition
The START Condition precedes all commands to the
device, and is defined as a HIGH to LOW transition of SDA
when SCL is HIGH. The N84C163 monitors the SDA and
SCL lines and will not respond until this condition is met.
SCL FROM
MASTER
8
1
9
DATA OUTPUT
FROM TRANSMITTER
DATA OUTPUT
FROM RECEIVER
START
ACKNOWLEDGE
Figure 5. Acknowledge Timing
N84C163
1
0
1
0
a10
a9
a8
R/W
Note: a8, a9 and a10 correspond to the address of the memory array address word.
Figure 6. Slave Address Bits
Acknowledge
responds with an acknowledge after receiving each 8−bit
byte.
When the N84C163 begins a READ mode it transmits 8
bits of data, releases the SDA line and monitors the line for
an acknowledge. Once it receives this acknowledge, the
N84C163 will continue to transmit data. If no acknowledge
is sent by the Master, the device terminates data transmission
and waits for a STOP condition.
After a successful data transfer, each receiving device is
required to generate an acknowledge. The acknowledging
device pulls down the SDA line during the ninth clock cycle,
signaling that it received the 8 bits of data.
The N84C163 responds with an acknowledge after
receiving a START condition and its slave address. If the
device has been selected along with a write operation, it
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N84C163
WRITE OPERATIONS
Byte Write
Page Write
In the Byte Write mode, the Master device sends the
START condition and the slave address information (with
the R/W bit set to zero) to the Slave device. After the Slave
generates an acknowledge, the Master sends a 8−bit address
that is to be written into the address pointers of the N84C163.
After receiving another acknowledge from the Slave, the
Master device transmits the data to be written into the
addressed memory location. The N84C163 acknowledges
once more and the Master generates the STOP condition. At
this time, the device begins an internal programming cycle
to non−volatile memory. While the cycle is in progress, the
device will not respond to any request from the Master
device.
The N84C163 writes up to 16 bytes of data in a single
write cycle, using the Page Write operation. The page write
operation is initiated in the same manner as the byte write
operation, however instead of terminating after the initial
byte is transmitted, the Master is allowed to send up to 15
additional bytes. After each byte has been transmitted, the
N84C163 will respond with an acknowledge and internally
increment the lower order address bits by one. The high
order bits remain unchanged.
If the Master transmits more than 16 bytes before sending
the STOP condition, the address counter ‘wraps around,’
and previously transmitted data will be overwritten.
When all 16 bytes are received, and the STOP condition
has been sent by the Master, the internal programming cycle
begins. At this point, all received data is written to the
N84C163 in a single write cycle.
BUS ACTIVITY:
MASTER
SDA LINE
S
T
A
R
T
BYTE
ADDRESS
SLAVE
ADDRESS
S
T
O
P
DATA
S
P
A
C
K
A
C
K
A
C
K
Figure 7. Byte Write Timing
BUS ACTIVITY:
MASTER
SDA LINE
S
T
A
R
T
BYTE
ADDRESS (n)
SLAVE
ADDRESS
DATA n
S
T
DATA n+15 O
P
DATA n+1
S
P
A
C
K
A
C
K
A
C
K
A
C
K
A
C
K
Figure 8. Page Write Timing
Acknowledge Polling
condition followed by the slave address for a write
operation. If the N84C163 is still busy with the write
operation, no ACK will be returned. If a write operation has
completed, an ACK will be returned and the host can then
proceed with the next read or write operation.
Disabling of the inputs can be used to take advantage of
the typical write cycle time. Once the stop condition is issued
to indicate the end of the host’s write operation, the
N84C163 initiates the internal write cycle. ACK polling can
be initiated immediately. This involves issuing the start
WRITE PROTECTION
The Write Protection feature allows the user to protect
against inadvertent memory array programming. If the WP
pin is tied to VCC, the entire memory array is protected and
becomes read only. The N84C163 will accept both slave and
byte addresses, but the memory location accessed is
protected from programming by the device’s failure to send
an acknowledge after the first byte of data is received.
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N84C163
READ OPERATIONS
if the last READ or WRITE access was to address N, the
READ immediately following would access data from
address N+1. If N = E (where = 2047 for the N84C163) then
the counter will ‘wrap around’ to address 0 and continue to
clock out data. After the N84C163 receives its slave address
information (with the R/W bit set to one), it issues an
acknowledge, then transmits the 8−bit byte requested. The
master device does not send an acknowledge, but will
generate a STOP condition.
The READ operation for the N84C163 is initiated in the
same manner as the write operation with one exception, that
R/W bit is set to one. Three different READ operations are
possible:
Immediate/Current
Address
READ,
Selective/Random READ and Sequential READ.
Immediate/Current Address Read
The N84C163’s address counter contains the address of
the last byte accessed, incremented by one. In other words,
BUS ACTIVITY:
MASTER
SDA LINE
S
T
A
R
T
S
T
O
P
SLAVE
ADDRESS
P
S
A
C
K
DATA
N
O
A
C
K
SCL
8
9
SDA8TH BIT
DATA OUT
NO ACK
STOP
Figure 9. Immediate Address Read Timing
Selective/Random Read
memory array can be read during one operation. If more than
E (where E=2047 for the N84C163) bytes are read out, the
counter will ‘wrap around’ and continue to clock out data
bytes.
Selective/Random READ operations allow the Master
device to select at random any memory location for a READ
operation. The Master device first performs a ‘dummy’
write operation by sending the START condition, slave
address and byte addresses of the location it wishes to read.
After the N84C163 acknowledges, the Master device sends
the START condition and the slave address again, this time
with the R/W bit set to one. The N84C163 then responds
with its acknowledge and sends the 8−bit byte requested.
The master device does not send an acknowledge but will
generate a STOP condition.
Manual Reset Operation
The N84C163 RESET or RESET pin can also be used as
a manual reset input.
Only the “active” edge of the manual reset input is
internally sensed. The positive edge is sensed if RESET is
used as a manual reset input and the negative edge is sensed
if RESET is used as a manual reset input.
An internal counter starts a 200 ms count. During this
time, the complementary reset output will be kept in the
active state. If the manual reset input is forced active for
more than 200 ms, the complementary reset output will
switch back to the non active state after the 200 ms expired,
regardless for how long the manual reset input is forced
active.
The embedded EEPROM is disabled as long as a reset
condition is maintained on any RESET pin. If the external
forced RESET/RESET is longer than internal controlled
time−out period, tPURST, the memory will not respond with
an acknowledge for any access as long as the manual reset
input is active.
Sequential Read
The Sequential READ operation can be initiated by either
the Immediate Address READ or Selective READ
operations. After the N84C163 sends the inital 8−bit byte
requested, the Master will responds with an acknowledge
which tells the device it requires more data. The N84C163
will continue to output an 8−bit byte for each acknowledge,
thus sending the STOP condition.
The data being transmitted from the N84C163 is outputted
sequentially with data from address N followed by data from
address N+1. The READ operation address counter
increments all of the N84C163 address bits so that the entire
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N84C163
BUS ACTIVITY:
MASTER
SDA LINE
S
T
A
R
T
S
T
A
R
T
BYTE
ADDRESS (n)
SLAVE
ADDRESS
S
T
O
P
SLAVE
ADDRESS
P
S
S
A
C
K
A
C
K
A
C
K
DATA n
A
C
K
Figure 10. Selective Read Timing
BUS ACTIVITY:
MASTER
SLAVE
ADDRESS
DATA n
DATA n+1
N
O
DATA n+2
S
T
O
P
DATA n+x
SDA LINE
P
A
C
K
A
C
K
A
C
K
A
C
K
A
C
K
Figure 11. Sequential Read Timing
ORDERING INFORMATION
Orderable Part Numbers − N84C163 Series
(See Notes 1 − 4)
Device
Reset Threshold
Voltage
N84C163WD45TG
4.50 V − 4.75 V
N84C163WD42TG
4.25 V − 4.50 V
N84C163WD30TG
3.00 V − 3.15 V
N84C163WD28TG
2.85 V − 3.00 V
N84C163WD25TG
2.55 V − 2.70 V
Package−Pins
Shipping
SOIC−8
3000 Tape & Reel
1. All packages are RoHS−compliant (Lead−free, Halogen−free).
2. The standard lead finish is NiPdAu.
3. For additional package and temperature options, please contact your nearest
ON Semiconductor Sales office.
4. For detailed information and a breakdown of device nomenclature and numbering
systems, please see the ON Semiconductor Device Nomenclature document,
TND310/D, available at www.onsemi.com
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10
N
O
N84C163
SOIC 8, 150 mils
CASE 751BD−01
ISSUE O
E1
E
SYMBOL
MIN
A
1.35
1.75
A1
0.10
0.25
b
0.33
0.51
c
0.19
0.25
D
4.80
5.00
E
5.80
6.20
E1
3.80
MAX
4.00
1.27 BSC
e
PIN # 1
IDENTIFICATION
NOM
h
0.25
0.50
L
0.40
1.27
θ
0º
8º
TOP VIEW
D
h
A1
θ
A
c
e
b
L
SIDE VIEW
END VIEW
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC MS-012.
ON Semiconductor is licensed by the Philips Corporation to utilize the I2C bus protocol.
ON Semiconductor and
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