MC100EL38
5V ECL ÷2, ÷4/6 Clock
Generation Chip
Description
The MC100EL38 is a low skew ÷2, ÷4/6 clock generation chip
designed explicitly for low skew clock generation applications. The
internal dividers are synchronous to each other, therefore, the common
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output edges are all precisely aligned. The device can be driven by
either a differential or single-ended ECL or, if positive power supplies
are used, PECL input signal.
The VBB pin, an internally generated voltage supply, is available to
this device only. For single-ended input conditions, the unused
differential input is connected to VBB as a switching reference voltage.
SOIC−20 WB
VBB may also rebias AC coupled inputs. When used, decouple VBB
DW SUFFIX
and VCC via a 0.01 mF capacitor and limit current sourcing or sinking
CASE 751D−05
to 0.5 mA. When not used, VBB should be left open.
The common enable (EN) is synchronous so that the internal
dividers will only be enabled/disabled when the internal clock is
MARKING DIAGRAM*
already in the LOW state. This avoids any chance of generating a runt
20
clock pulse on the internal clock when the device is enabled/disabled
as can happen with an asynchronous control. An internal runt pulse
could lead to losing synchronization between the internal divider
100EL38
AWLYYWWG
stages. The internal enable flip-flop is clocked on the falling edge of
the input clock, therefore, all associated specification limits are
referenced to the negative edge of the clock input.
1
The Phase_Out output will go HIGH for one clock cycle whenever
A
= Assembly Location
the ÷2 and the ÷4/6 outputs are both transitioning from a LOW to a
WL
=
Wafer Lot
HIGH. This output allows for clock synchronization within the system.
YY
= Year
Upon startup, the internal flip-flops will attain a random state;
WW
= Work Week
therefore, for systems which utilize multiple EL38s, the master reset
G
= Pb-Free Package
(MR) input must be asserted to ensure synchronization. For systems
*For additional marking information, refer to
which only use one EL38, the MR pin need not be exercised as the
Application Note AND8002/D.
internal divider design ensures synchronization between the ÷2 and
the ÷4/6 outputs of a single device.
• 50 ps Output-to-Output Skew
ORDERING INFORMATION
• Synchronous Enable/Disable
Device
Package
Shipping†
• Master Reset for Synchronization
MC100EL38DWR2G SOIC−20 WB 1000/Tape & Reel
• ESD Protection:
(Pb-Free)
♦ 2 kV Human Body Model
♦ 100 V Machine Model
†For information on tape and reel specifications, including part orientation and tape sizes, please refer
• The 100 Series Contains Temperature Compensation
to our Tape and Reel Packaging Specifications
• PECL Mode Operating Range:
Brochure, BRD8011/D.
♦ VCC = 4.2 V to 5.7 V with VEE = 0 V
• NECL Mode Operating Range:
• Moisture Sensitivity Level: 3 (Pb-Free)
♦ VCC = 0 V with VEE = −4.2 V to −5.7 V
♦ For Additional Information, see Application Note
AND8003/D
• Internal 75 kW Input Pulldown Resistors on CLK, EN,
• Flammability Rating:
MR, and DIVSEL
♦ UL 94 V−0 @ 0.125 in, Oxygen Index: 28 to 34
• Q Output will Default LOW with Inputs Open or at
• Transistor Count = 388 devices
VEE
• Meets or Exceeds JEDEC Spec EIA/JESD78 IC
• These Devices are Pb-Free, Halogen Free and are
Latchup Test
RoHS Compliant
© Semiconductor Components Industries, LLC, 2016
July, 2016 − Rev. 9
1
Publication Order Number:
MC100EL38/D
MC100EL38
VCC
Q0
Q0
Q1
Q1
Q2
Q2
Q3
Q3
VEE
20
19
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
9
10
CLK
VBB
MR
VCC
EN DIV_SEL CLK
VCC Phase_Out Phase_Out
* All VCC pins are tied together on the die.
Warning: All VCC and VEE pins must be externally connected
to Power Supply to guarantee proper operation.
Figure 1. Pinout Assignment (Top View)
Q0
CLK
P2
CLK
R
Q0
Q1
Q1
Q2
EN
R
P4/6
Q2
R
Q3
MR
Q3
DIVSEL
PHASE_OUT
Phase
Out
R Logic
PHASE_OUT
Figure 2. Logic Diagram
Table 1. PIN DESCRIPTION
Pin
Table 2. FUNCTION TABLE
Function
CLK, CLK
ECL Diff Clock Inputs
Q0, Q1; Q0, Q1
ECL Diff ÷2 Outputs
Q2, Q3; Q2, Q3
ECL Diff ÷4/6 Outputs
EN
ECL Sync Enable Input
MR
ECL Master Reset Input
DIVSEL
ECL Frequency Select Input
Phase_Out, Phase_Out
ECL Phase Sync Diff. Signal Output
VBB
Reference Voltage Output
VCC
Positive Supply
VEE
Negative Supply
CLK
EN
MR
Z
ZZ
X
L
H
X
L
L
H
Function
Divide
Hold Q0−3
Reset Q0−3
Z = Low-to-High Transition
ZZ = High-to-Low Transition
X = Don’t Care
DIVSEL
L
H
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2
Q2, Q3 OUTPUTS
Divide by 4
Divide by 6
MC100EL38
Table 3. MAXIMUM RATINGS
Symbol
Rating
Unit
VCC
PECL Mode Power Supply
Parameter
VEE = 0 V
Condition 1
Condition 2
8
V
VEE
NECL Mode Power Supply
VCC = 0 V
−8
V
VI
PECL Mode Input Voltage
NECL Mode Input Voltage
VEE = 0 V
VCC = 0 V
6
−6
V
Iout
Output Current
Continuous
Surge
50
100
MA
IBB
VBB Sink/Source
± 0.5
mA
TA
Operating Temperature Range
−40 to +85
°C
Tstg
Storage Temperature Range
−65 to +150
°C
qJA
Thermal Resistance (Junction-to-Ambient)
0 lfpm
500 lfpm
SOIC−20 WB
90
60
°C/W
qJC
Thermal Resistance (Junction-to-Case)
Standard Board
SOIC−20 WB
30 to 35
°C/W
Tsol
Wave Solder (Pb-Free)
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