CAT5140 D

CAT5140
Single Channel 256 Tap
Digital Potentiometer (POT)
with Integrated EEPROM
and I2C Control
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The CAT5140 is a single channel non-volatile 256-tap digital POT.
This digital POT is comprised of a series of equal value resistor
elements connected between two externally accessible end points. The
tap points between each resistive element can be selectively connected
to the wiper output via internal CMOS switches forming a linear taper
electronic potentiometer.
The CAT5140 contains a volatile wiper register (WR) and an 8-bit
non-volatile EEPROM for wiper position and 5 additional
non-volatile registers for general purpose data storage. Programming
of the registers is controlled via I2C interface. On power up, the wiper
position is reset to the most recent value stored in the non-volatile
memory register (IVR).
The CAT5140 is available in an Pb free, RoHS compliant 8-lead
MSOP package, and operates over the industrial temperature range of
−40C to +85C.
MSOP−8 3x3
Z SUFFIX
CASE 846AD
MARKING DIAGRAM
ABUT
YMX
Features













400 kHz I2C Compatible Interface
256 Position Linear Taper Potentiometer
End-to-End Resistance = 50 kW / 100 kW
TCR = 100 ppm/C (typical)
Standby Current = 2 mA (max)
Typical Wiper Resistance = 70 W @ 3.3 V
Operating Voltage = 2.5 V to 5.5 V
6 Registers 8-bit Non-volatile EEPROM
2,000,000 Data Write Stores
100 Year Data Retention
8-lead MSOP Package
NiPdAu Plating
These Devices are Pb-Free and are RoHS Compliant
Volatile
SCL
SDA
I2C and
CONTROL
WP
GND
ACR
WIPER
1
Non−Volatile
1
ABUT = 100 kW Resistance
ABTJ = 50 kW Resistance
Y = Production Year
Y = (Last Digit)
M = Production Month
M = (1 − 9, A, B, C)
X = Production Revision
PIN CONNECTIONS
WP
VCC
1
VCC
SCL
RH
SDA
RL
GND
RW
(Top View)
RH
IVR
GP
GP
GP
ABTJ
YMX
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 2 of this data sheet.
RL
RW
Figure 1. Functional Block Diagram
 Semiconductor Components Industries, LLC, 2013
July, 2013 − Rev. 4
1
Publication Order Number:
CAT5140/D
CAT5140
Table 1. ORDERING INFORMATION
Part Number
Resistance
CAT5140ZI−50−GT3
50 kW
CAT5140ZI−00−GT3
100 kW
Temperature Range
Package
Shipping†
−40C to 85C
MSOP−8 3x3
(Pb-Free)
3000/Tape & Reel
3000/Tape & Reel
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
1. 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.
Table 2. PIN FUNCTION DESCRIPTION
Pin No.
Pin Name
Description
1
WP
Memory Write Protect: Active Low
2
SCL
Serial Clock
3
SDA
Serial Data
4
GND
Ground
5
RW
Wiper Terminal
6
RL
Potentiometer Low Terminal
7
RH
Potentiometer High Terminal
8
VCC
Supply Voltage
WP: Write Protect Input
open drain output and can be wire-Ored with the other open
drain or open collector I/Os.
The WP pin when tied low prevents any write operations
within the device.
RH, RL: Resistor End Points
SCL: Serial Clock
The set of RH and RL pins is equivalent to the terminal
connections on a mechanical potentiometer.
The CAT5140 serial clock input pin is used to clock all
data transfers into or out of the device.
RW: Wiper
SDA: Serial Data
The RW pin is equivalent to the wiper terminal of a
mechanical potentiometer and its position is controlled by
the WR register.
The CAT5140 bidirectional serial data pin is used to
transfer data into and out of the device. The SDA pin is an
Table 3. ABSOLUTE MAXIMUM RATINGS
Parameter
VIN Supply Voltage VCC to Ground (Note 2)
Terminal voltages: RH, RL, RW , SDA, SCL, WP
Rating
Unit
−0.5 to +7
V
−0.5 to VCC + 0.5
V
6.0
mA
Storage Temperature Range
−65 to +150
C
Junction Temperature Range
Wiper Current
−40 to +150
C
Lead Soldering Temperature (10 seconds)
300
C
ESD Rating HBM (Human Body Model)
2000
V
ESD Rating MM (Machine Model)
200
V
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
2. 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.
Table 4. RECOMMENDED OPERATING CONDITIONS
Parameter
VCC
Wiper Current
Temperature Range
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2
Rating
Unit
2.5 to 5.5
V
3
mA
−40 to +85
_C
CAT5140
Table 5. POTENTIOMETER CHARACTERISTICS (Note 3) (VCC = +2.5 V to +5.5 V, −40_C to +85_C unless otherwise specified.)
Limits
Parameter
Test Conditions
Symbol
Min
Typ
Max
Units
Potentiometer Resistance ‘−50’
RPOT
50
kW
Potentiometer Resistance ‘−00’
RPOT
100
kW
Potentiometer Resistance Tolerance
Power Rating
25C
Wiper Current
IW
Wiper Resistance
Integral Non-Linearity
Integral Non-Linearity
mW
3
mA
200
W
RW
Voltage Divider Mode
INL
1
LSB (Note 4)
DNL
0.5
LSB (Note 4)
RINL
1
LSB (Note 4)
RDNL
0.5
LSB (Note 4)
VCC
V
Resistor Mode
Differential Non-Linearity
Voltage on RH or RL
%
50
IW = 3 mA
VCC = 3.3 V
Differential Non-Linearity
VSS = 0 V
VTERM
70
20
VSS
Resolution
0.4
%
Zero Scale Error
0
0.5
2
LSB (Note 5)
Full Scale Error
−2
−0.5
0
LSB (Note 5)
Temperature Coefficient of RPOT
(Notes 6, 7)
TCRPOT
Ratiometric Temp. Coefficient
(Notes 6, 7)
TCRATIO
Potentiometer Capacitances
(Notes 6, 7)
CH/CL/CW
10/10/25
pF
RPOT = 50 kW (Note 8)
fc
0.4
MHz
Frequency Response
ppm/C
100
20
ppm/C
3.
4.
5.
6.
Latch-up protection is provided for stresses up to 100 mA on address and data pins from −1 V to VCC +1 V.
LSB = RTOT / 255 or (RH − RL) / 255, single pot.
V(RW)255−V(RW)0]/255 (RW)255 = 0xFF, (RW)0 = 0x00.
Absolute linearity is utilized to determine actual wiper voltage versus expected voltage as determined by wiper position when used as a
potentiometer.
7. Relative linearity is a measure of the error in step size. It is determined by the actual change in voltage between two successive tap positions
when used as a potentiometer.
8. This parameter is tested initially and after a design or process change that affects the parameter.
Table 6. D.C. OPERATING CHARACTERISTICS (VCC = +2.5 V to +5.5 V, −40C to +85C unless otherwise specified.)
Parameter
Test Conditions
Symbol
Power Supply Current
Volatile Write & Read
fSCL = 400 kHz
VCC = 5.5 V, Inputs = GND
Power Supply Current
Non-volatile Write
Standby Current
Input Leakage Current
Output Leakage Current
Max
Units
ICC1
1
mA
fSCL = 400 kHz
VCC = 5.5 V, Inputs = GND
ICC2
3
mA
VCC = 5.0 V
ISB
VIN = GND to VCC
ILI
VOUT = GND to VCC
ILO
Min
−10
2
mA
+10
mA
10
mA
Input Low Voltage
VIL
−1
VCC x 0.3
V
Input High Voltage
VIH
VCC x 0.7
VCC + 1.0
V
0.4
V
2.0
V
SDA Output Buffer Low Voltage
Power-On Recall
VCC = 2.5 V, IOL = 4 mA
VOL1
Minimum VCC for memory recall
VPOR
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1.4
CAT5140
Table 7. CAPACITANCE (TA = 25C, f = 1.0 MHz, VCC = 5 V)
Test Conditions
Symbol
Max
Units
Input/Output Capacitance (SDA)
VI/O = 0 V
CI/O (Note 9)
8
pF
Input Capacitance (SCL, WP)
VIN = 0 V
CIN (Note 9)
6
pF
Test
Table 8. POWER UP TIMING (Notes 9 and 10)
Symbol
Max
Units
Power-up to Read Operation
tPUR
1
ms
Power-up to Write Operation
tPUW
1
ms
Parameter
9. This parameter is tested initially and after a design or process change that affects the parameter.
10. tPUR and tPUW are delays required from the time VCC is stable until the specified operation can be initiated.
Table 9. DIGITAL POT TIMING
Parameter
Symbol
Wiper Response Time After Power Supply Stable
Wiper Response Time: SCL falling edge after last bit of wiper position data
byte to wiper change
Max
Units
tWRPO
Min
50
ms
tWR
20
ms
Max
Units
Table 10. ENDURANCE
Parameter
Reference Test Method
Symbol
Min
Endurance
MIL−STD−883, Test Method 1033
NEND
2,000,000
Cycles
Data Retention
MIL−STD−883, Test Method 1008
TDR
100
Years
Table 11. A.C. CHARACTERISTICS (VCC = +2.5 V to +5.5 V, −40_C to +85_C unless otherwise specified.)
Symbol
Parameter
Min
Typ
Max
Units
400
kHz
Clock Frequency
fSCL
Clock High Period
tHIGH
600
ns
Clock Low Period
tLOW
1300
ns
Start Condition Setup Time (for a Repeated Start Condition)
tSU:STA
600
ns
Start Condition Hold Time
tHD:STA
600
ns
Data in Setup Time
tSU:DAT
100
ns
Data in Hold Time
tHD:DAT
0
ns
Stop Condition Setup Time
tSU:STO
600
ns
tBUF
1300
ns
WP Setup Time
tSU:WP
0
ms
WP Hold Time
tHD:WP
2.5
ms
Time the bus must be free before a new transmission can start
SDA and SCL Rise Time
tR
300
ns
SDA and SCL Fall Time
tF
300
ns
Data Out Hold Time
tDH
100
ns
Noise Suppression Time Constant at SCL, SDA Inputs
TI
50
ns
SLC Low to SDA Data Out and ACK Out
tAA
1
ms
Non-Volatile Write Cycle Time
tWR
10
ms
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4
4
CAT5140
SCL
SDA
Start
Condition
Stop
Condition
Figure 2. Start and STOP Timing
tHIGH
tF
tR
tLOW
SCL
tSU:STA
tHD:DAT
tHD:STA
tSU:DAT
tSU:STO
SDA IN
tBUF
tAA
tDH
SDA OUT
Figure 3. Bus Timing
Bus Release
Delay (Receiver)
Bus Release Delay (Transmitter)
SCL from
Master
1
8
9
Data Output
from Transmitter
Data Output
from Receiver
ACK Setup ( tSU:DAT)
Start
ACK Delay ( tAA)
Figure 4. Acknowledge Timing
Start
Stop
SCL
tHD:STO, tHD:STO:NV
CLK1
SDA IN
tHD:WP
tSU:WP
WP
Figure 5. WP Timing
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5
CAT5140
Device Operation
START Condition
The CAT5140 is a resistor array integrated with a I2C
serial interface logic, an 8-bit volatile wiper register, and six
8-bit, non-volatile memory data registers. The resistor array
contains 255 separate resistive elements connected in series.
The physical ends of the array are equivalent to the fixed
terminals of a mechanical potentiometer (RH and RL). The
tap positions between and at the ends of the series resistors
are connected to the output wiper terminal (RW) by CMOS
transistor switches. Only one tap point for the potentiometer
is connected to the wiper terminal at a time and is determined
by the value of an 8-bit Wiper Register (WR).
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 CAT5140 monitors the SDA and
SCL lines and will not respond until this condition is met.
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 bus Master begins a transmission by sending a
START condition. The Master then sends the address of the
particular slave device it is requesting. CAT5140 has a fixed
7 bit slave address: 0101000. The 8th bit (LSB) is the
Read/Write instruction bit. For a Read the value is “1” and
for Write the value is “0”.
After the Master sends a START condition and the slave
address byte, the CAT5140 monitors the bus and responds
with an acknowledge (on the SDA line) when its address
matches the transmitted slave address.
RH
FFh
FEh
80h
RW
Table 12. SALVE ADDRESS BIT FORMAT
01h
MSB
0
00h
RL
LSB
1
0
1
0
0
0
R/W
Acknowledge (ACK)
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.
CAT5140 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 responds with
an acknowledge after receiving each 8-bit byte. When the
CAT5140 is in 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
CAT5140 will continue to transmit data. If no acknowledge
is sent by the Master, the device terminates data transmission
and waits for a STOP condition.
When power is first applied to CAT5140 the wiper is set
to midscale; Wiper Register = 80h. When the power supply
becomes sufficient to read the non-volatile memory the
value stored in the Initial Value Register (IVR) is transferred
into the Wiper Register and the wiper moves to this new
position. Five additional 8-bit non-volatile memory data
registers are provided for general purpose data storage. Data
can be read or written to the volatile or the non-volatile
memory data registers via the I2C bus.
Serial Bus Protocol
The following defines the features of the 2-wire bus
protocol:
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 is high
will be interpreted as a START or STOP condition.
WRITE Operation
In the Write mode, the Master device sends the START
condition and the slave address information to the Slave
device. In CAT5140’s case the slave address also contains a
Read/Write command (R/W) on the last bit of the 1st byte.
After receiving an acknowledge from the Slave, the Master
device transmits a second byte containing a Memory
Address to select an available register. After a second
acknowledge is received from the Slave, the Master device
sends the data to be written into the selected register. The
The device controlling the transfer is a master, typically a
processor or controller, and the device being controlled is the
slave. The master will always initiate data transfers and
provide the clock for both transmit and receive operations.
Therefore, the CAT5140 will be considered a slave device
in all applications.
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CAT5140
READ Operation
CAT5140 acknowledges once more and the Master
generates the STOP condition, at which time if a nonvolatile
data register is being selected, the device begins an internal
programming cycle to non-volatile memory. If the STOP
condition is not sent immediately after the last ACK the
internal non-volatile programming cycle doesn’t start.
While this internal cycle is in progress, the device will not
respond to any request from the Master device.
Write operations to volatile memory are completed during
the last bit of the data byte before the slave’s acknowledge.
The device will be ready for another command only after a
STOP condition sent by Master.
A Read operation with a designated address consists of a
three byte instruction followed by one or more Data Bytes
(See Figure 3). The master initiates the operation issuing a
START, an Identification byte with the R/W bit set to “0”, an
Address Byte. Then the master sends a second START, and
a second Identification byte with the R/W bit set to “1”. After
each of the three bytes, the CAT5140 responds with an ACK.
Then CAT5140 transmits the Data Byte. The master then can
continue the read operation with the content of the next
register by sending acknowledge or can terminate the read
operation by issuing a NoACK followed by a STOP
condition after the last bit of a Data Byte.
Acknowledge Polling
The 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
CAT5140 initiates the internal write cycle. ACK polling can
be initiated immediately. This involves issuing the start
condition followed by the slave address. If the CAT5140 is
still busy with the write operation, no ACK will be returned.
If the CAT5140 has completed the write operation, an
acknowledge will be returned and the host can then proceed
with the next instruction operation.
Table 13. MEMORY MAP
Non-volatile
Default
Value
Register
Address
8
ACR
7
WRITE Protection
The Write Protection feature allows the user to protect
against inadvertent programming of the non-volatile data
registers. If the WP pin is tied to LOW, the data registers are
protected and become read only. Similarly, the WP pin going
low after start will interrupt a nonvolatile write to data
registers, while the WP pin going low after an internal write
cycle has started will have no effect on any write operation.
CAT5140 will accept slave addresses but the data registers
are protected from programming, which the device indicates
by failing to send an acknowledge after data is received.
Volatile
Register
Reserved
6
General Purpose
00h
N/A
5
General Purpose
00h
N/A
4
General Purpose
00h
N/A
3
General Purpose
00h
N/A
2
General Purpose
00h
N/A
1
Device ID (read only)
D0h
N/A
0
IVR
80h
WR
If the master sends address 07h or addresses greater than
08h the slave responds with NoACK after the Memory
Address byte.
Address 8: Volatile Access Control Register − ACR (I/O)
The ACR bit 7 (VOL) toggles between Non-volatile and volatile registers accessed at address 00h. When VOL is Low (0),
the non-volatile IVR is accessed at address 00h. When VOL is high (1), the volatile Wiper Register is accessed at address 00h.
The initial default value for VOL = 0.
Bit
7
6
5
4
3
2
1
0
Name
0/1 VOL
0
0
0
0
0
0
0
00h and 80h are the only values that should be written to address 08h. For any other value written to address 08h the slave will
load only bit 7 but it will answer with a NoACK.
Address 7: RESERVED
The user should not read or write to this address. CAT5140 will respond with NoACK and it will take no action.
Address 07h can be accessed only in a sequential read and its content is FFh.
Address 6−2: Non-volatile General Purpose Memory (I/O)
8-bit Non-volatile Memory
Bit
7
6
5
4
3
2
1
0
Name
−
−
−
−
−
−
−
−
General Purpose Memories are preprogrammed at the factory to a default value of “00h”.
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CAT5140
Address 1: Device ID (Read Only)
Bit 7 defines the Digital POT device manufacturer; Catalyst/On Semiconductor = high (1)
Bit
7
6
5
4
3
2
1
0
Name
1
1
0
1
0
0
0
0
A writing to address 1 has no effect. Attempts to do so will return an ACK but no data will be written.
Address 0: IVR/WR Register (I/O)
Address 00h accesses one of two memory registers: the initial value register (IVR) or the wiper register (WR) depending
upon the value of bit 7 in Access Control Register (ACR) which is at address 08h, above.
WR controls the wiper’s position and is a volatile memory while IVR is non-volatile and retains its data after the chip has
been powered down. Writes to IVR automatically update the WR while writes to WR leave IVR unaffected.
WR: Wiper Register = Volatile.
IVR: Initial Value Register = Non-volatile.
Writing and Reading operations:
1. If Bit 7 from ACR is 0 (non-volatile):
 A write operation to address 00h will write the same value in WR and IVR.
 A read operation to address 00h will output the content of IVR.
2. If bit 7 from ACR is 1 (volatile):
 A write operation to address 00h will write in WR only.
 A read operation to address 00h will output the content of WR.
All changes to the wiper’s position are immediate. There is no delay the wiper’s movement when writing to non-volatile
memory.
Bit
7
6
5
4
3
2
1
0
Name
−
−
−
−
−
−
−
−
IVR is preprogrammed at the factory to a default value of “80h”.
I2C SERIAL BUS INSTRUCTION FORMAT
Table 14. I2C SLAVE ADDRESS BITS
Slave Address
R/W bit
Transfer Data
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
Read
51h
0
1
0
1
0
0
0
1 (R)
Write
50h
0 (W)
If the Slave Address Byte sent by the host is different the device will send a NoACK.
I2C Protocol:
(A) Write data procedure with designated address. (See Table 15)
1. Host transfers the start condition
2. Host transfers the device slave address with the write mode R/W bit (0).
3. Device sends ACK
4. Host transfers the corresponding memory address to the device
5. Device sends ACK
6. Host transfers the write data to the designated address
7. Device sends ACK
8. Routines (6) and (7) are repeated based on the transfer data, and the designated address is automatically incremented*
9. Host transfers the stop condition.
*Automatically incremented writes are not possible after a non-volatile write.
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CAT5140
Single write to either a volatile or non-volatile register. Note that Bit 7 of ACR determines which memory type is being written.
Table 15. SINGLE WRITE
(1)
(2)
Start
Slave
Address
0
R/W
(3)
(4)
(5)
(6)
(7)
(9)
0
ACK
Memory
Address
0
ACK
Write
Data
0
ACK
Stop
A single write to either a volatile or non-volatile register. At address 00h bit 7 of ACR determines which memory type is being written.
Table 16. MULTIPLE WRITES
(1)
(2)
Start
Slave
Address
0
R/W
(3)
(4)
(5)
(6)
(7)
0
ACK
Memory
Address
0
ACK
Write
Data
0
ACK
(8)
(9)
Write
Data
0
ACK
Stop
Multiple writes are possible only if the starting address is 08h and it should be stopped with the first nonvolatile data byte. If
a nonvolatile write does not end with a STOP procedure the register is not written.
(B) Read data procedure with designated address.
1. Host transfers the start condition
2. Host transfers the device slave address with the write mode R/W bit (0)
3. ACK signal recognition from the device
4. Host transfers the read address
5. ACK signal recognition from the device
6. Host transfers the re-start condition
7. Host transfers the slave address with the read mode R/W bit (1).
8. ACK signal recognition from the device
9. The device transfers the read data from the designated address
10. Host transfers ACK signal
11. The (9) & (10) routines above are repeated if needed, and the read address is auto-incremented
12. Host transfers ACK ‘H’ to the device
13. Host transfers the stop condition
Table 17. READ DATA
(1)
(2)
Start
Slave
Address
0
R/W
(3)
(4)
(5)
(6)
(7)
0
ACK
Memory
Address
0
ACK
Restart
Slave
Address
1
R/W
(8)
(9)
(10)
(11)
(12)
(13)
0
ACK
Read
Data
0
ACK
Read
Data
1
ACK
Stop
(C) Read data procedure without a designated address.
1. Host transfers the start condition
2. Host transfers the device slave address with the read mode R/W bit =1
3. ACK signal recognition from the device. (Host then changes to receiver)
4. The device transfers data from the previous access address +1
5. Host transfers ACK signal
6. The (4) & (5) routines above are repeated if needed
7. Host transfers ACK ‘H’
8. Host transfers the stop condition
Table 18. Read Data w/o Designated Address
(1)
Start
(2)
Slave
Address
1
R/W
(3)
(4)
(5)
(6)
(7)
(8)
0
ACK
Read
Data
0
ACK
Read
Data
1
ACK
Stop
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9
CAT5140
PACKAGE DIMENSIONS
MSOP 8, 3x3
CASE 846AD
ISSUE O
SYMBOL
MIN
NOM
MAX
A1
0.05
0.10
0.15
A2
0.75
0.85
0.95
b
0.22
0.38
c
0.13
0.23
D
2.90
3.00
3.10
E
4.80
4.90
5.00
E1
2.90
3.00
3.10
1.10
A
E
E1
0.65 BSC
e
L
0.60
0.40
0.80
L1
0.95 REF
L2
0.25 BSC
θ
0º
6º
TOP VIEW
D
A
DETAIL A
A2
c
A1
e
END VIEW
b
SIDE VIEW
q
L2
L
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC MO-187.
L1
DETAIL A
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CAT5140/D