IDT49FCT20805
2.5V CMOS DUAL 1-TO-5 CLOCK DRIVER
INDUSTRIAL TEMPERATURE RANGE
2.5V CMOS DUAL
1-TO-5 CLOCK DRIVER
IDT49FCT20805
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FEATURES:
DESCRIPTION:
Advanced CMOS Technology
Guaranteed low skew < 200ps (max.)
Very low propagation delay < 2.5ns (max)
Very low duty cycle distortion < 270ps (max)
Very low CMOS power levels
Operating frequency up to 166MHz
TTL compatible inputs and outputs
Two independent output banks with 3-state control
1:5 fanout per bank
"Heartbeat" monitor output
V
CC
= 2.5V ± 0.2V
Available in SSOP and QSOP packages
The FCT20805 is a 2.5 volt clock driver built using advanced CMOS
technology. The device consists of two banks of drivers, each with a 1:5 fanout
and its own output enable control. The device has a "heartbeat" monitor for
diagnostics and PLL driving. The MON output is identical to all other outputs
and complies with the output specifications in this document. The FCT20805
offers low capacitance inputs.
The FCT20805 is designed for high speed clock distribution where signal
quality and skew are critical. The FCT20805 also allows single point-to-point
transmission line driving in applications such as address distribution, where one
signal must be distributed to multiple recievers with low skew and high signal
quality.
FUNCTIONAL BLOCK DIAGRAM
OE
A
IN
A
5
OA
1
- OA
5
IN
B
OE
B
5
OB
1
- OB
5
MON
INDUSTRIAL TEMPERATURE RANGE
1
c
2014 Integrated Device Technology, Inc.
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
FEBRUARY 2014
DSC-6172/113
IDT49FCT20805
2.5V CMOS DUAL 1-TO-5 CLOCK DRIVER
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATIONS
V
CCA
OA
1
OA
2
OA
3
GND
A
OA
4
OA
5
GND
Q
OE
A
IN
A
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
V
CCB
OB
1
OB
2
OB
3
GND
B
OB
4
OB
5
MON
OE
B
IN
B
SSOP/ QSOP
TOP VIEW
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
V
CC
V
I
V
O
T
J
T
STG
Description
Input Power Supply Voltage
Input Voltage
Output Voltage
Junction Temperature
Storage Temperature
Max
–0.5 to +4.6
–0.5 to +5.5
–0.5 to V
CC
+0.5
150
–65 to +165
Unit
V
V
V
°C
°C
PIN DESCRIPTION
Pin Names
OE
A
, OE
B
IN
A
, IN
B
OAn, OBn
MON
Clock Inputs
Clock Outputs
Monitor Output
Description
3-State Output Enable Inputs (Active LOW)
NOTE:
1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause
permanent damage to the device. This is a stress rating only and functional operation
of the device at these or any other conditions above those indicated in the operational
sections of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect reliability.
FUNCTION TABLE
(1)
Inputs
OE
A
, OE
B
L
L
H
H
IN
A
, IN
B
L
H
L
H
OAn, OBn
L
H
Z
Z
Outputs
MON
L
H
L
H
CAPACITANCE
(T
A
= +25
O
C, f = 1.0MHz)
Symbol
C
IN
C
OUT
Parameter
(1)
Input Capacitance
Output Capacitance
Conditions
V
IN
= 0V
V
OUT
= 0V
Typ.
3
—
Max.
4
6
Unit
pF
pF
NOTE:
1. H = HIGH
L = LOW
Z = High-Impedance
NOTE:
1. This parameter is measured at characterization but not tested.
2
IDT49FCT20805
2.5V CMOS DUAL 1-TO-5 CLOCK DRIVER
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified
Industrial: T
A
= -40°C to +85°C, V
CC
= 2.5V ± 0.2V
Symbol
V
IH
V
IL
I
IH
I
IL
I
OZH
I
OZL
V
IK
I
ODH
I
ODL
I
OS
V
OH
V
OL
Parameter
Input HIGH Level
Input LOW Level
Input HIGH Current
Input LOW Current
High Impedance Output Current
(3-State Outputs Pins)
Clamp Diode Voltage
Output HIGH Current
Output LOW Current
Short Circuit Current
Output HIGH Voltage
Output LOW Voltage
V
CC
= Min., I
IN
= –18mA
V
CC
= 2.5V, V
IN
= V
IH
or V
IL
, V
O
= 1.25V
(3,4)
V
CC
= 2.5V, V
IN
= V
IH
or V
IL
, V
O
= 1.25V
(3,4)
V
CC
= Max., V
O
= GND
(3,4)
V
CC
= Min.
V
IN
= V
IH
or V
IL
V
CC
= Min.
V
IN
= V
IH
or V
IL
I
OH
= –8mA
I
OH
= –100μA
I
OL
= 8mA
I
OL
= 100μA
V
CC
= Max.
V
CC
= Max.
V
CC
= Max.
V
I
= 5.5V
V
I
= GND
V
O
= V
CC
V
O
= GND
Test Conditions
(1)
Min.
1.7
–0.5
—
—
—
—
—
–15
25
–30
1.7
(5)
V
CC
- 0.2
—
—
Typ.
(2)
—
—
—
—
—
—
–0.7
–35
55
–50
—
—
0.2
—
Max.
5.5
0.7
±1
±1
±1
±1
–1.2
–90
100
–120
—
—
0.4
0.2
V
V
mA
mA
mA
V
μA
Unit
V
V
NOTES:
1. For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at V
CC
= 2.5V, 25°C ambient.
3. Not more than one output should be shorted at one time. Duration of the test should not exceed one second.
4. This parameter is guaranteed but not tested.
5. V
OH
= Vcc -0.6V at rated current.
3
IDT49FCT20805
2.5V CMOS DUAL 1-TO-5 CLOCK DRIVER
INDUSTRIAL TEMPERATURE RANGE
POWER SUPPLY CHARACTERISTICS
Symbol
I
CCL
I
CCH
I
CCZ
ΔI
CC
I
CCD
Parameter
Quiescent Power Supply Current
Test Conditions
(1)
V
CC
= Max.
V
IN
= GND or V
CC
V
CC
= Max.
V
IN
= V
CC –
0.6V
V
CC
= Max.
C
L
= 15pF
All Outputs Toggling
V
CC
= Max.
C
L
= 15pF
All Outputs Toggling
fi = 133MHz
V
CC
= Max.
C
L
= 15pF
All Outputs Toggling
fi = 166MHz
V
IN
= V
CC
V
IN
= GND
V
IN
= V
CC
V
IN
= GND
V
IN
= V
CC –
0.6V
V
IN
= GND
V
IN
= V
CC
V
IN
= GND
V
IN
= V
CC –
0.6V
V
IN
= GND
Min.
—
Typ.
(2)
0.1
Max.
20
Unit
μA
Power Supply Current per Input HIGH
Dynamic Power Supply Current
per Output
(3)
Total Power Supply Current
(4)
—
—
35
65
250
100
μA
μA/MHz
I
C
—
—
—
—
100
100
115
115
125
125
mA
150
150
NOTES:
1.
2.
3.
4.
For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device type.
Typical values are at V
CC
= 2.5V, +25°C ambient.
This parameter is not directly testable, but is derived for use in Total Power Supply calculations.
I
C
= I
QUIESCENT
+ I
INPUTS
+ I
DYNAMIC
I
C
= I
CC
+
ΔI
CC
D
H
N
T
+ I
CCD
(f
O
N
O
)
I
CC
= Quiescent Current (I
CCL
, I
CCH
and I
CCZ
)
ΔI
CC
= Power Supply Current for a TTL High Input (V
I
N
= V
CC
-0.6V)
D
H
= Duty Cycle for TTL Inputs High
N
T
= Number of TTL Inputs at D
H
I
CCD
= Dynamic Current Caused by an Input Transition Pair (HLH or LHL)
f
O
= Output Frequency
N
O
= Number of Outputs at f
O
4
IDT49FCT20805
2.5V CMOS DUAL 1-TO-5 CLOCK DRIVER
INDUSTRIAL TEMPERATURE RANGE
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
(3,4)
Symbol
t
PLH
t
PHL
t
R
t
F
t
SK(O)
t
SK(P)
t
SK(PP)
t
PZL
t
PZH
t
PLZ
t
PHZ
f
MAX
Parameter
Propagation Delay
IN
A
to OAn, IN
B
to OBn
Output Rise Time (0.8V to 2V)
Output Fall Time (2V to 0.8V)
Same device output pin to pin skew
(5)
Pulse skew
(6,9)
Part to part skew
(7)
Output Enable Time
OE
A
to OAn, OE
B
to OBn
Output Disable Time
OE
A
to OAn, OE
B
to OBn
Input Frequency
—
133
MHz
—
5.2
ns
Conditions
(1)
C
L
= 15pF
f
≤
133MHz
—
—
—
—
—
—
1.5
1.5
270
270
550
5.2
ns
ns
ps
ps
ps
ns
Min
.
(2)
1
Max
.
3
Unit
ns
Symbol
t
PLH
t
PHL
t
R
t
F
t
SK(O)
t
SK(P)
t
SK(PP)
t
PZL
t
PZH
t
PLZ
t
PHZ
f
MAX
Parameter
Propagation Delay
IN
A
to OAn, IN
B
to OBn
Output Rise Time (0.7V to 1.7V)
Output Fall Time (1.7V to 0.7V)
Same device output pin to pin skew
(5)
Pulse skew
(6,9)
Part to part skew
(7)
Output Enable Time
OE
A
to OAn, OE
B
to OBn
Output Disable Time
OE
A
to OAn, OE
B
to OBn
Input Frequency
Conditions
(1,8)
C
L
= 15pF
133MHz
≤
f
≤
166MHz
Min
.
(2)
0.5
—
—
—
—
—
—
—
—
Max
.
2.5
1.25
1.25
200
270
550
5.2
5.2
166
Unit
ns
ns
ns
ps
ps
ps
ns
ns
MHz
NOTES:
1. See test circuits and waveforms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
3. t
PLH
and t
PHL
are production tested. All other parameters guaranteed but not production tested.
4. Propagation delay range indicated by Min. and Max. limit is due to V
CC
, operating temperature and process parameters. These propagation delay limits do not imply skew.
5. Skew measured between all outputs under identical transitions and load conditions.
6. Skew measured is difference between propagation delay times t
PHL
and t
PLH
of same outputs under identical load conditions.
7. Part to part skew for all outputs given identical transitions and load conditions at identical V
CC
levels and temperature.
8. Airflow of 1m/s is recommended for frequencies above 133MHz.
9. This parameter is measured using f = 1MHz.
5
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