L
OW
S
KEW
,
÷2/4,÷4/5/6,
D
IFFERENTIAL
-
TO
-3.3V LVPECL C
LOCK
G
ENERATOR
G
ENERAL
D
ESCRIPTION
The ICS87339I-11 is a low skew, high performance
Differential-to-3.3V LVPECL Clock Generator/Divider. The
ICS87339I-11 has one differential clock input pair. The CLK,
nCLK pair can accept most standard differential input
levels. The clock enable isinternally synchronized to
eliminate runt pulses on theoutputs during asynchronous
assertion/deassertion of the clock enable pin.
Guaranteed output and part-to-part skew characteristics
make the ICS87339I-11 ideal for clock distribution
applications demanding well defined performance and
repeatability.
ICS87339I-11
F
EATURES
•
Dual ÷2, ÷4 differential 3.3V LVPECL outputs;
Dual ÷4, ÷5, ÷6 differential 3.3V LVPECL outputs
•
One differential CLK, nCLK input pair
•
CLK, nCLK pair can accept the following differential
input levels: LVDS, LVPECL, LVHSTL, SSTL, HCSL
•
Maximum clock input frequency: 1GHz
•
Translates any single ended input signal (LVCMOS, LVTTL,
GTL) to LVPECL levels with resistor bias on nCLK input
•
Output skew: 35ps (maximum)
•
Part-to-part skew: 385ps (maximum)
•
Bank skew: Bank A - 20ps (maximum)
Bank B - 20ps (maximum)
•
Propagation delay: 2.1ns (maximum)
•
LVPECL mode operating voltage supply range:
V
CC
= 3V to 3.6V, V
EE
= 0V
•
Available in both standard (RoHS5) and lead-free (RoHS 6)
packages
B
LOCK
D
IAGRAM
DIV_SELA
QA0
nQA0
nCLK_EN
D
Q
LE
CLK
nCLK
QB0
nQB0
÷4, ÷5, ÷6
÷2, ÷4
P
IN
A
SSIGNMENT
V
CC
nCLK_EN
DIV_SELB0
CLK
nCLK
RESERVED
MR
V
CC
DIV_SELB1
DIV_SELA
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
V
CC
QA0
nQA0
QA1
nQA1
QB0
nQB0
QB1
nQB1
V
EE
R
QA1
nQA1
ICS87339I-11
20-Lead TSSOP
6.50mm x 4.40mm x 0.92 package body
G Package
Top View
20-Lead SOIC, 300MIL
7.5mm x 12.8mm x 2.25mm package body
M Package
Top View
R
MR
DIV_SELB0
DIV_SELB1
QB1
nQB1
87339AGI-11
www.idt.com
1
REV. B AUGUST 2, 2010
L
OW
S
KEW
,
÷2/4,÷4/5/6,
D
IFFERENTIAL
-
TO
-3.3
V
LVPECL C
LOCK
G
ENERATOR
T
ABLE
1. P
IN
D
ESCRIPTIONS
Number
1, 8, 20
2
3
4
5
6
Name
V
CC
nCLK_EN
DIV_SELB0
CLK
nCLK
RESERVED
Power
Input
Input
Input
Input
Reser ve
Type
Description
Positive supply pins.
Pulldown Clock enable. LVCMOS / LVTTL interface levels. See Table 3.
Selects divide value for Bank B outputs as described in Table 3.
Pulldown
LVCMOS / LVTTL interface levels.
Pulldown Non-inver ting differential clock input.
Pullup
ICS87339I-11
Inver ting differential clock input.
Reser ve pin.
Active High Master Reset. When logic HIGH, the internal dividers are reset
causing the true outputs Qx to go low and the inver ted outputs nQx to go
7
MR
Input
Pulldown
high. When logic LOW, the internal dividers and the outputs are enabled.
LVCMOS / LVTTL interface levels.
Selects divide value for Bank B outputs as described in Table 3.
9
DIV_SELB1
Input
Pulldown
LVCMOS / LVTTL interface levels.
Selects divide value for Bank A outputs as described in Table 3.
10
DIV_SELA
Input
Pulldown
LVCMOS / LVTTL interface levels.
Power
Negative supply pin.
11
V
EE
12, 13
nQB1, QB1 Output
Differential output pair. LVPECL interface levels.
Differential output pair. LVPECL interface levels.
14, 15
nQB0, QB0
Output
Differential output pair. LVPECL interface levels.
16, 17
nQA1, QA1 Output
18, 19
nQA0, QA0
Output
Differential output pair. LVPECL interface levels.
NOTE:
Pullup
and
Pulldown
refer to internal input resistors. See Table 2, Pin Characteristics, for typical values.
T
ABLE
2. P
IN
C
HARACTERISTICS
Symbol
C
IN
R
PULLUP
R
PULLDOWN
Parameter
Input Capacitance
Input Pullup Resistor
Input Pulldown Resistor
Test Conditions
Minimum
Typical
4
51
51
Maximum
Units
pF
kΩ
kΩ
87339AGI-11
www.idt.com
2
REV. B AUGUST 2, 2010
L
OW
S
KEW
,
÷2/4,÷4/5/6,
D
IFFERENTIAL
-
TO
-3.3V LVPECL C
LOCK
G
ENERATOR
T
ABLE
3. C
ONTROL
I
NPUT
F
UNCTION
T
ABLE
Inputs
MR
1
0
0
0
0
0
0
0
0
0
nCLK_EN
X
1
0
0
0
0
0
0
0
0
DIV_SELA
X
X
0
0
0
0
1
1
1
1
DIV_SELB0
X
X
0
0
1
1
0
0
1
1
DIV_SELB1
X
X
0
1
0
1
0
1
0
1
QA0, QA1
LOW
Not
Switching
÷2
÷2
÷2
÷2
÷4
÷4
÷4
÷4
Outputs
nQA0, nQA1
HIGH
Not
Switching
÷2
÷2
÷2
÷2
÷4
÷4
÷4
÷4
QB0, QB1
LOW
Not
Switching
÷4
÷5
÷6
÷5
÷4
÷5
÷6
÷5
nQB0, nQB1
HIGH
Not
Switching
÷4
÷5
÷6
÷5
÷4
÷5
÷6
÷5
ICS87339I-11
NOTE: After nCLK_EN switches, the clock outputs stop switching following a rising and falling input clock edge.
CLK
t
RR
MR
Q (÷n)
F
IGURE
1A. MR T
IMING
D
IAGRAM
Disabled
CLK
nCLK
Enabled
nCLK_EN
QAx, QBx
nQAx, nQBx
F
IGURE
1B.
N
CLK_EN T
IMING
D
IAGRAM
87339AGI-11
www.idt.com
3
REV. B AUGUST 2, 2010
L
OW
S
KEW
,
÷2/4,÷4/5/6,
D
IFFERENTIAL
-
TO
-3.3
V
LVPECL C
LOCK
G
ENERATOR
A
BSOLUTE
M
AXIMUM
R
ATINGS
Supply Voltage, V
CC
Inputs, V
I
Outputs, I
O
Continuous Current
Surge Current
Package Thermal Impedance,
θ
JA
20 Lead TSSOP
20 Lead SOIC
Storage Temperature, T
STG
4.6V
-0.5V to V
CC
+ 0.5 V
50mA
100mA
73.2°C/W (0 lfpm)
46.2°C/W (0 lfpm)
-65°C to 150°C
NOTE: Stresses beyond those listed under Absolute
Maximum Ratings may cause permanent damage to the
device. These ratings are stress specifications only. Functional
operation of product at these conditions or any conditions be-
yond those listed in the
DC Characteristics
or
AC Character-
istics
is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect product reliability.
ICS87339I-11
T
ABLE
4A. P
OWER
S
UPPLY
DC C
HARACTERISTICS
,
V
CC
= 3.3V±0.3V, T
A
= -40°C
TO
85°C
Symbol
V
CC
I
EE
Parameter
Positive Supply Voltage
Power Supply Current
Test Conditions
Minimum
3.0
Typical
3.3
Maximum
3.6
105
Units
V
mA
T
ABLE
4B. LVCMOS / LVTTL DC C
HARACTERISTICS
,
V
CC
= 3.3V±0.3V, T
A
= -40°C
TO
85°C
Symbol
V
IH
V
IL
I
IH
I
IL
Parameter
Input High Voltage
Input Low Voltage
Input High Current
Input Low Current
nCLK_EN, MR,
DIV_SELA, DIV_SELBx
nCLK_EN, MR,
DIV_SELA, DIV_SELBx
V
IN
= V
CC
= 3.6V
V
IN
= 0V, V
CC
= 3.6V
-5
Test Conditions
Minimum
2
-0.3
Typical
Maximum
V
CC
+ 0.3
0.8
150
Units
V
V
µA
µA
T
ABLE
4C. D
IFFERENTIAL
DC C
HARACTERISTICS
,
V
CC
= 3.3V±0.3V, T
A
= -40°C
TO
85°C
Symbol
I
IH
I
IL
V
PP
Parameter
Input High Current
Input Low Current
nCLK
CLK
nCLK
CLK
Test Conditions
V
IN
= V
CC
= 3.6V
V
IN
= V
CC
= 3.6V
V
IN
= 0V, V
CC
= 3.6V
V
IN
= 0V, V
CC
= 3.6V
-150
-5
1.3
V
CC
- 0.85
Minimum
Typical
Maximum
5
150
Units
µA
µA
µA
µA
V
V
Peak-to-Peak Input Voltage
0.15
Common Mode Input Voltage;
V
CMR
V
EE
+ 0.5
NOTE 1, 2
NOTE 1: For single ended applications
,
the maximum input voltage for CLK, nCLK is V
CC
+ 0.3V.
NOTE 2: Common mode voltage is defined as V
IH
.
87339AGI-11
www.idt.com
4
REV. B AUGUST 2, 2010
L
OW
S
KEW
,
÷2/4,÷4/5/6,
D
IFFERENTIAL
-
TO
-3.3V LVPECL C
LOCK
G
ENERATOR
T
ABLE
4D. LVPECL DC C
HARACTERISTICS
,
V
CC
= 3.3V±0.3V, T
A
= -40°C
TO
85°C
Symbol Parameter
V
OH
V
OL
V
SWING
Output High Voltage; NOTE1
Output Low Voltage; NOTE 1
Peak-to-Peak Output Voltage Swing
Test Conditions
Minimum
V
CC
- 1.4
V
CC
- 2.0
0.6
Typical
Maximum
V
CC
- 0.9
V
CC
- 1.7
1.0
Units
V
V
V
ICS87339I-11
NOTE 1: Outputs terminated with 50
Ω
to V
CC
- 2V.
T
ABLE
5. AC C
HARACTERISTICS
,
V
CC
= 3.3V±0.3V, T
A
= -40°C
TO
85°C
Symbol Parameter
f
CLK
t
PD
t
sk(o)
t
sk(b)
t
sk(pp)
t
S
t
H
t
RR
t
PW
t
R
/ t
F
Clock Input Frequency
Propagation Delay; NOTE 1
Output Skew; NOTE 2, 5
Bank Skew;
NOTE 3, 5
Setup Time
Hold Time
Reset Recover y Time
Minimum Pulse Width
Output Rise/Fall Time
CLK
20% to 80%
550
100
600
52
Bank A
Bank B
nCLK_EN to CLK
CLK to nCLK_EN
350
100
400
CLK to Q (Diff)
1.6
15
10
10
Test Conditions
Minimum
Typical
Maximum
1
2.1
35
20
20
385
Units
GHz
ns
ps
ps
ps
ps
ps
ps
ps
ps
ps
%
Par t-to-Par t Skew; NOTE 4, 5
odc
Output Duty Cycle
48
All data taken with outputs ÷4.
NOTE 1: Measured from the differential input crossing point to the differential output crossing point.
NOTE 2: Defined as skew between outputs at the same supply voltage and with equal load conditions.
Measured at the output differential cross points
NOTE 3: Defined as skew within a bank of outputs and with equal load conditions.
NOTE 4: Defined as skew between outputs on different devices operating at the same supply voltages
and with equal load conditions. Using the same type of inputs on each device, the outputs are measured
at the differential cross points.
NOTE 5: This parameter is defined in accordance with JEDEC Standard 65.
87339AGI-11
www.idt.com
5
REV. B AUGUST 2, 2010
