ON NB6L239 2.5 v / 3.3 v any differential clock in to differential lvpecl out ã·1/2/4/8, ã·2/4/8/16 clock divider Datasheet

NB6L239
2.5 V / 3.3 V Any Differential
Clock IN to Differential
LVPECL OUT ÷1/2/4/8,
÷2/4/8/16 Clock Divider
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Features
The NB6L239 is a high−speed, low skew clock divider with two
divider circuits, each having selectable clock divide ratios; 1/2/4/8
and 2/4/8/16. Both divider circuits drive a pair of differential
LVPECL outputs. (More device information on page 7).
• Maximum Clock Input Frequency, 3.0 GHz
• Input Compatibility with LVDS/LVPECL/CML/HSTL
• Rise/Fall Time 70 ps Typical
• < 10 ps Typical Output−to−Output Skew
• Ex. 622 MHz Input Generates 38.8 MHz to 622 MHz Outputs
• Internal 50 Termination Provided
• Random Clock Jitter < 1 ps RMS
• Divide−by−1 Edge of QA Aligned to QB Divided Output
• Operating Range: VCC = 2.375 V to 3.465 V with VEE = 0 V
• Master Reset for Synchronization of Multiple Chips
• VBBAC Reference Output
• Synchronous Output Enable/Disable
MARKING DIAGRAM*
Bottom View
QFN−16
MN SUFFIX
CASE 485G
XXXX
A
L
Y
W
XXXX
XXXX
ALYW
= Device Code
= Assembly Location
= Wafer Lot
= Year
= Work Week
*For additional marking information, refer to
Application Note AND8002/D.
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 11 of this data sheet.
SELA0
SELA1
QA
CLK
QA
VT
CLK
QB
QB
EN
SELB0
SELB1
+
MR
Figure 1. Simplified Logic Diagram
 Semiconductor Components Industries, LLC, 2004
April, 2004 − Rev. 0
1
Publication Order Number:
NB6L239/D
NB6L239
MR
16
VT
1
CLK
2
SELA0 SELA1 VCC
15
14
13
12
QA
11
QA
NB6L239
CLK
3
10
QB
VBBAC
4
9
QB
5
EN
6
7
8
SELB0 SELB1 VEE
Exposed Pad (EP)
Figure 2. Pinout: QFN−16 (Top View)
Table 1. PIN DESCRIPTION
Pin
Name
I/O
Description
1
VT
2
CLK
LVPECL, CML, LVDS,
HSTL Input
Noninverted Differential CLOCK Input.
3
CLK
LVPECL, CML, LVDS,
HSTL Input
Inverted Differential CLOCK Input.
4
VBBAC
5
EN*
LVCMOS/LVTTL Input
Synchronous Output Enable
6
SELB0*
LVCMOS/LVTTL Input
Clock Divide Select Pin
7
SELB1*
LVCMOS/LVTTL Input
Clock Divide Select Pin
8
VEE
Power Supply
Negative Supply Voltage
9
QB
LVPECL Output
Inverted Differential Output. Typically terminated with 50 resistor to VTT.
10
QB
LVPECL Output
Noninverted Differential Output. Typically terminated with 50 resistor to VTT.
11
QA
LVPECL Output
Inverted Differential Output. Typically terminated with 50 resistor to VTT.
12
QA
LVPECL Output
Noninverted Differential Output. Typically terminated with 50 resistor to VTT.
13
VCC
Power Supply
Positive Supply Voltage.
14
SELA1*
LVCMOS/LVTTL Input
Clock Divide Select Pin
15
SELA0*
LVCMOS/LVTTL Input
Clock Divide Select Pin
16
MR**
LVCMOS/LVTTL Input
Master Reset Asynchronous, Default Open High, Asserted LOW
EP
Power Supply (OPT)
Internal 100 Center−Tapped Termination Pin for CLK and CLK.
Output Voltage Reference for Capacitor Coupled Inputs, Only.
The Exposed Pad on the QFN−16 package bottom is thermally connected to the die
for improved heat transfer out of package. The pad is not electrically connected to the
die, but is recommended to be electrically and thermally connected to VEE on the
PC board.
*Pins will default LOW when left OPEN.
**Pins will default HIGH when left OPEN.
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2
NB6L239
+
SELA0
VCC
SELA1
A
4
CLK
VT
1
2
50 R 8
QA
QA
50 CLK
R 2
4
B
8
QB
QB
16
EN
SELB0
SELB1
VEE
+
MR
VBBAC
Figure 3. Logic Diagram
Table 2. FUNCTION TABLES
CLK
EN*
MR**
X
L
H
X
H
H
L
FUNCTION
Divide
Hold Q
Reset Q
Table 3. CLOCK DIVIDE SELECT, QA OUTPUTS
SELA1*
SELA0*
L
L
H
H
L
H
L
H
QA Outputs
Divide by 1
Divide by 2
Divide by 4
Divide by 8
Table 4. CLOCK DIVIDE SELECT, QB OUTPUTS
SELB1*
SELB0*
L
L
H
H
L
H
L
H
QB Outputs
Divide by 2
Divide by 4
Divide by 8
Divide by 16
= Low−to−High Transition
= High−to−Low Transition
X = Don’t Care
*Pins will default LOW when left OPEN.
**Pins will default HIGH when left OPEN.
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3
NB6L239
Table 5. ATTRIBUTES
Characteristics
Value
Internal Input Pulldown Resistor
Internal Input Pullup Resistor
ESD Protection
75 k
75 k
Human Body Model
Machine Model
Charged Device Model
Moisture Sensitivity, Indefinite Time Out of Drypack (Note 1)
Flammability Rating
> 1500 V
> 150 V
> 1000 V
Level 1
Oxygen Index: 28 to 34
UL 94 V−0 @ 0.125 in
Transistor Count
367
Meets or exceeds JEDEC Spec EIA/JESD78 IC Latchup Test
1. For additional Moisture Sensitivity information, refer to Application Note AND8003/D.
MAXIMUM RATINGS
Symbol
Parameter
Condition 1
Condition 2
Rating
Units
3.6
V
3.6
V
50
100
mA
mA
± 0.5
mA
−40 to +85
°C
VCC
Positive Mode Power Supply
VEE = 0 V
VI
Input Voltage
VEE = 0 V
Iout
Output Current
Continuous
Surge
IBB
VBBAC Sink/Source
TA
Operating Temperature Range
Tstg
Storage Temperature Range
−65 to +150
°C
JA
Thermal Resistance (Junction−to−Ambient)
0 lfpm
500 lfpm
41.6
35.2
°C/W
°C/W
JC
Thermal Resistance (Junction−to−Case)
Standard Board
4.0
°C/W
Tsol
Wave Solder
< 3 sec @ 248°C
265
°C
VEE VI VCC
Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit
values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied, damage may occur and reliability may be affected.
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NB6L239
Table 6. DC CHARACTERISTICS, CLOCK INPUTS, LVPECL OUTPUTS
(VCC = 2.375 V to 3.465 V, VEE = 0 V)
−40C
Symbol
85°C
Min
Typ
Max
Min
Typ
Max
Min
Typ
Max
Unit
30
40
50
30
40
50
30
40
50
mA
Output HIGH Voltage (Notes 2, 3)
VCC = 3.3 V
VCC = 2.5 V
VCC−1150
VCC−1060
VCC−950
VCC−1100
VCC−1015
VCC − 900
VCC−1050
VCC −980
VCC − 850
mV
2150
1350
2240
1440
2350
1550
2200
1400
2285
1485
2400
1600
2250
1450
2320
1520
2450
1650
Output LOW Voltage
(Notes 2, 3)
VCC = 3.3 V
VCC = 2.5 V
VCC−1870
VCC−1760
VCC−1630
VCC−1820
VCC−1700
VCC−1580
VCC−1770
VCC−1660
VCC−1530
1430
630
1540
740
1670
870
1480
680
1600
800
1720
920
1530
730
1640
840
1770
970
Characteristic
IEE
Power Supply Current
VOH
VOL
25C
mV
DIFFERENTIAL INPUT DRIVEN SINGLE−ENDED (Figures 7, 10)
Vth
Input Threshold Reference Voltage
(Note 4)
100
VCC − 100
100
VCC − 100
100
VCC − 100
mV
VIH
Single−ended Input
HIGH Voltage
Vth + 100
VCC
Vth + 100
VCC
Vth + 100
VCC
mV
VIL
Single−ended Input
LOW Voltage
VEE
Vth − 100
VEE
Vth − 100
VEE
Vth − 100
mV
VBBAC
Output Voltage Reference @ 100 A
(Note 7)
VCC = 3.3 V
VCC = 2.5 V
mV
VCC−1460
VCC−1330
VCC−1200
VCC−1460
VCC−1340
VCC−1200
VCC−1460
VCC−1350
VCC−1200
1840
1040
1970
1170
2100
1300
1840
1040
1960
1160
2100
1300
1840
1040
1950
1150
2100
1300
DIFFERENTIAL INPUT DRIVEN DIFFERENTIALLY (Figures 8, 9, 11) (Note 6)
VIHD
Differential Input
HIGH Voltage
100
VCC
100
VCC
100
VCC
mV
VILD
Differential Input
LOW Voltage
VEE
VCC – 100
VEE
VCC – 100
VEE
VCC – 100
mV
VCMR
Input Common
Mode Range (Differential Cross−point
Voltage) (Note 5)
50
VCC – 50
50
VCC – 50
50
VCC – 50
mV
VID
Differential Input
Voltage (VIHD(CLK) −
VILD(CLK)) and
(VIHD(CLK)−VILD(CLK))
100
VCC −
VEE
100
VCC −
VEE
100
VCC −
VEE
mV
RTIN
Internal Input Termination Resistor
45
55
45
55
45
55
50
50
50
NOTE: Device will meet the specifications after thermal equilibrium has been established when mounted in a test socket or printed circuit
board with maintained transverse airflow greater than 500 lfpm. Electrical parameters are guaranteed only over the declared
operating temperature range. Functional operation of the device exceeding these conditions is not implied. Device specification limit
values are applied individually under normal operating conditions and not valid simultaneously.
2. Input and output parameters vary 1:1 with VCC.
3. Outputs loaded with 50 to VCC – 2.0 V for proper operation.
4. Vth is applied to the complementary input when operating in single−ended mode.
5. VCMRMIN varies 1:1 with VEE, VCMRMAX varies 1:1 with VCC.
6. Input and output voltage swing is a single−ended measurement operating in differential mode.
7. VBBAC used to rebias capacitor−coupled inputs only (see Figures 16 and 17).
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NB6L239
Table 7. DC CHARACTERISTICS, LVTTL/LVCMOS INPUTS (VCC = 2.375 V to 3.465 V, VEE = 0 V, TA = −40°C to +85°C)
Symbol
Characteristic
Min
Typ
Max
Unit
VIH
Input HIGH Voltage (LVCMOS/LVTTL)
2.0
VCC
V
VIL
Input LOW Voltage (LVCMOS/LVTTL)
VEE
0.8
V
IIH
Input HIGH Current
−150
150
A
IIL
Input LOW Current
−150
150
A
NOTE: Device will meet the specifications after thermal equilibrium has been established when mounted in a test socket or printed circuit
board with maintained transverse airflow greater than 500 lfpm. Electrical parameters are guaranteed only over the declared
operating temperature range. Functional operation of the device exceeding these conditions is not implied. Device specification limit
values are applied individually under normal operating conditions and not valid simultaneously.
Table 8. AC CHARACTERISTICS VCC = 2.375 V to 3.465 V; VEE = 0 V (Note 8)
−40°C
Symbol
Min
Characteristic
25°C
Typ
fin
Maximum Input CLOCK Frequency
VOUTPP
Output Voltage Amplitude (Notes 10, 11)
QA(2, 4, 8), QB(n)
fin 3.0 GHz
QA(1), QB(n)
fin 2.5 GHz
QA(1), QB(n)
2.5 GHz < fin 3.0 GHz
450
450
300
650
650
650
tPLH,
tPHL
Propagation Delay to
Output Differential @ 50 MHz
370
330
470
370
tRR
Reset Recovery
0
ts
Setup Time @ 50 MHz
EN, CLK
SELA/B, CLK
th
Hold Time @ 50 MHz
CLK, EN
CLK, SELA/B
tskew
Within−Device Skew @ 50 MHz
Device−to−Device Skew
Duty Cycle Skew
tPW
Minimum Pulse Width
tJITTER
RMS Random Clock Jitter
(See Figure 20. Fmax/JITTER)
VINPP
Input Voltage Swing (Differential Configuration)
(Note 10)
100
tr
tf
Output Rise/Fall Times @ 50 MHz
(20% − 80%)
30
Max
Min
Typ
3.0
CLK, Qn
MR, Qn
Min
Typ
Max
Unit
3.0
GHz
mV
650
630
650
370
330
470
380
−90
0
0
0
−60
−300
150
700
65
200
570
430
5
25
25
450
450
200
650
610
650
400
330
500
400
−90
0
−90
ps
0
0
−60
−300
0
0
−60
−300
ps
150
700
65
200
150
700
65
200
ps
30
80
40
550
5
30
30
570
430
30
90
45
550
100
120
30
35
90
45
65
VCC
−VEE
100
120
30
ps
ps
ps
<1
VCC
−VEE
60
6
30
30
600
480
550
<1
Qn, Qn
Max
3.0
450
450
250
(Note 9)
(Note 9)
(Note 9)
MR
85°C
70
<1
ps
VCC
−VEE
mV
120
ps
NOTE: Device will meet the specifications after thermal equilibrium has been established when mounted in a test socket or printed circuit
board with maintained transverse airflow greater than 500 lfpm. Electrical parameters are guaranteed only over the declared
operating temperature range. Functional operation of the device exceeding these conditions is not implied. Device specification
limit values are applied individually under normal operating conditions and not valid simultaneously.
8. Measured using a 750 mV, 50% duty cycle clock source. All loading with 50 to VCC − 2.0 V.
9. Skew is measured between outputs under identical transitions and conditions. Duty cycle skew is defined only for differential operation
when the delays are measured from the cross point of the inputs to the cross point of the outputs.
10. Input and output voltage swing is a single−ended measurement operating in differential mode.
11. Output Voltage Amplitude (VOHCLK − VOLCLK) at input CLOCK frequency, fin. The output frequency, fout, is the input CLOCK frequency
divided by n, fout = fin n. Input CLOCK frequency is 3.0 GHz.
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NB6L239
Application Information
single−ended input CLOCK signals. For the
The NB6L239 is a high−speed, low skew clock divider
capacitor−coupled CLK and/or CLK inputs, VBBAC should
with two divider circuits, each having selectable clock
divide ratios; 1/2/4/8 and 2/4/8/16. Both divider
be connected to the VT pin and bypassed to ground with a
circuits drive a pair of differential LVPECL outputs. The
0.01 F capacitor. Inputs CLK and CLK must be signal
internal dividers are synchronous to each other. Therefore,
driven or auto oscillation may result.
the common output edges are precisely aligned.
The common enable (EN) is synchronous so that the
The NB6L239 clock inputs can be driven by a variety of
internal divider flip−flops will only be enabled/disabled
differential signal level technologies including LVDS,
when the internal clock is in the LOW state. This avoids any
LVPECL, HSTL, or CML. The differential clock input
chance of generating a runt pulse on the internal clock when
buffer employs a pair of internal 50 termination resistors
the device is enabled/disabled, as can happen with an
in a 100 center−tapped configuration and accessible via
asynchronous control. The internal enable flip−flop is
the VT pin. This feature provides transmission line
clocked on the falling edge of the input clock. Therefore, all
termination on−chip, at the receiver end, eliminating
associated specification limits are referenced to the negative
external components. The VBBAC reference output can be
edge of the clock input.
used to rebias capacitor−coupled differential or
MR
CLK
Q (÷1)
Q (÷2)
Q (÷4)
Q (÷8)
Q (÷16)
Figure 4. Timing Diagram
CLK
tRR
tRR
MR
Q (÷n)
Figure 5. Master Reset Timing Diagram
NOTE:
On the rising edge of MR, Q goes HIGH after the first rising edge of CLK.
Internal Clock
Disabled
Internal Clock
Enabled
CLK
Q (÷n)
EN
Figure 6. Output Enable Timing Diagrams
The EN signal will “freeze” the internal divider flip−flops on the first falling edge of CLK after its assertion. The internal
divider flip−flops will maintain their state during the freeze. When EN is deasserted (LOW), and after the next falling edge
of CLK, then the internal divider flip−flops will “unfreeze” and continue to their next state count with proper phase relationships.
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NB6L239
CLK
CLK
VIH
Vth
VIL
CLK
CLK
Figure 8. Differential Inputs Driven Differentially
Vth
Figure 7. Differential Input Driven Single−Ended
CLK
CLK
VID = |VIHD(CLK) − VILD(CLK)|
VIHD
VILD
Figure 9. Differential Inputs Driven Differentially
VCC
Vthmax
VIHmax
CLK
VCC
VCMmax
VILmax
VIHDmax
VILDmax
VCMR
Vth
VIHmin
Vthmin
VEE
CLK
VCMmin
VILmin
VEE
Figure 10. Vth Diagram
VIHDmin
VILDmin
Figure 11. VCMR Diagram
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NB6L239
VCC
VCC
VCC
Zo = 50 LVPECL
Driver
VT = VCC − 2.0 V
NB6L239
CLK
Zo = 50 50 LVDS
Driver
VEE
50 VEE
Figure 13. LVDS Interface
VCC
VCC
NB6L239
CLK
VCC
Zo = 50 50 CML
Driver
50 VEE
50 VEE
Figure 15. Standard 50 Load HSTL Interface
VCC
VCC
NB6L239
CLK
VCC
Zo = 50 50 Differential
Driver
VEE
NB6L239
CLK
50 Single−Ended
Driver
VT = VBBAC*
50 Zo = 50 CLK
VEE
Figure 14. Standard 50 Load CML Interface
Zo = 50 VT =VEE
Zo = 50 CLK
VEE
VCC
NB6L239
CLK
50 HSTL
Driver
VT = VCC
Zo = 50 CLK
VEE
Figure 12. LVPECL Interface
Zo = 50 VT = OPEN
Zo = 50 CLK
VEE
VCC
NB6L239
CLK
50 50 Zo = 50 VCC
CLK
VT = VBBAC*
50 CLK
VEE
VEE
Figure 16. Capacitor−Coupled Differential
Interface (VT Connected to VBBAC)
VEE
Figure 17. Capacitor−Coupled Single−Ended
Interface (VT Connected to VBBAC)
*VBBAC bypassed to ground with a 0.01 F capacitor.
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800
8
700
7
600
6
500
5
400
4
300
3
200
2
100
1
JITTEROUT ps (RMS)
VOUTPP, OUTPUT VOLTAGE AMPLITUDE (mV)
(TYPICAL)
NB6L239
ÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉ
ÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉÉ
0
0
1
2
3
0
fout, CLOCK OUTPUT FREQUENCY (GHz)
Figure 18. Output Voltage Amplitude (VOUTPP)/RMS Jitter versus
Clock Output Frequency at Ambient Temperature (Typical) (fout = fin n).
CLK
VINPP = VIH(CLK) − VIL(CLK)
CLK
Q
VOUTPP = VOH(Q) − VOL(Q)
Q
tPHL
tPLH
Figure 19. AC Reference Measurement
NB6L239
Q
Zo = 50 D
Receiver
Device
Driver
Device
Q
Zo = 50 D
50 50 VTT
VTT = VCC − 2.0 V
Figure 20. Typical Termination for Output Driver and Device Evaluation
(See Application Note AND8020/D − Termination of ECL Logic Devices.)
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10
NB6L239
ORDERING INFORMATION
Package
Shipping†
NB6L239MN
QFN−16
123 Units / Rail
NB6L239MNR2
QFN−16
3000 / Tape & Reel
Device
†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.
Resource Reference of Application Notes
AN1405/D
− ECL Clock Distribution Techniques
AN1406/D
− Designing with PECL (ECL at +5.0 V)
AN1503/D
− ECLinPS I/O SPiCE Modeling Kit
AN1504/D
− Metastability and the ECLinPS Family
AN1568/D
− Interfacing Between LVDS and ECL
AN1642/D
− The ECL Translator Guide
AND8001/D
− Odd Number Counters Design
AND8002/D
− Marking and Date Codes
AND8020/D
− Termination of ECL Logic Devices
AND8066/D
− Interfacing with ECLinPS
AND8090/D
− AC Characteristics of ECL Devices
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NB6L239
PACKAGE DIMENSIONS
QFN−16
CASE 485G−01
ISSUE A
−X−
A
NOTES:
1. DIMENSIONING AND TOLERANCING PER
ANSI Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETERS.
3. DIMENSION D APPLIES TO PLATED
TERMINAL AND IS MEASURED BETWEEN
0.25 AND 0.30 MM FROM TERMINAL.
4. COPLANARITY APPLIES TO THE EXPOSED
PAD AS WELL AS THE TERMINALS.
M
−Y−
DIM
A
B
C
D
E
F
G
H
J
K
L
M
N
P
R
B
N
0.25 (0.010) T
0.25 (0.010) T
MILLIMETERS
MIN
MAX
3.00 BSC
3.00 BSC
0.80
1.00
0.23
0.28
1.75
1.85
1.75
1.85
0.50 BSC
0.875
0.925
0.20 REF
0.00
0.05
0.35
0.45
1.50 BSC
1.50 BSC
0.875
0.925
0.60
0.80
INCHES
MIN
MAX
0.118 BSC
0.118 BSC
0.031
0.039
0.009
0.011
0.069
0.073
0.069
0.073
0.020 BSC
0.034
0.036
0.008 REF
0.000
0.002
0.014
0.018
0.059 BSC
0.059 BSC
0.034
0.036
0.024
0.031
J
R
C
0.08 (0.003) T
−T−
K
SEATING
PLANE
E
H
G
L
5
8
4
9
1
12
F
16
D
13
P
NOTE 3
0.10 (0.004)
M
T X Y
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Japan: ON Semiconductor, Japan Customer Focus Center
2−9−1 Kamimeguro, Meguro−ku, Tokyo, Japan 153−0051
Phone: 81−3−5773−3850
http://onsemi.com
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For additional information, please contact your
local Sales Representative.
NB6L239/D
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