1
IDT49FCT3805/A
3.3V CMOS BUFFER/CLOCK DRIVER
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGE
SEPTEMBER 2001
2001 Integrated Device Technology, Inc.
DSC-3102/2
c
IDT49FCT3805/A
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGE
3.3V CMOS
BUFFER/CLOCK DRIVER
DESCRIPTION:
The FCT3805 is a 3.3 volt, non-inverting clock driver built using
advanced dual metal 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 FCT3805 offers low capacitance inputs
with hysteresis.
The FCT3805 is designed for high speed clock distribution where signal
quality and skew are critical. The FCT3805 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
5
O A
1
- O A
5
O B
1
- O B
5
OE
A
IN
A
OE
B
IN
B
M ON
5
PIN CONFIGURATION
OA
1
OA
3
OA
4
GND
Q
IN
A
V
CCA
OA
2
GND
A
OA
5
OE
A
1
2
3
4
5
6
7
8
9
OB
3
OB
4
MON
IN
B
V
CCB
OB
1
OB
2
GND
B
OB
5
OE
B
11
12
13
14
15
16
17
18
19
20
10
SOIC/ SSOP/ QSOP
TOP VIEW
FEATURES:
0.5 MICRON CMOS Technology
Guaranteed low skew < 500ps (max.)
Very low duty cycle distortion < 1.0ns (max.)
Very low CMOS power levels
TTL compatible inputs and outputs
Inputs can be driven from 3.3V or 5V components
Two independent output banks with 3-state control
1:5 fanout per bank
"Heartbeat" monitor output
V
CC
= 3.3V 0.3V
Available in SSOP, SOIC, and QSOP packages
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
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COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGE
IDT49FCT3805/A
3.3V CMOS BUFFER/CLOCK DRIVER
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
Description
Max
Unit
V
TERM(2)
Terminal Voltage with Respect to GND
0.5 to +4.6
V
V
TERM(3)
Terminal Voltage with Respect to GND
0.5 to +7
V
V
TERM(4)
Terminal Voltage with Respect to GND
0.5 to V
CC
+0.5
V
T
STG
Storage Temperature
65 to +150
C
I
OUT
DC Output Current
60 to +60
mA
NOTES:
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.
2. V
CC
terminals.
3. Input terminals.
4. Outputs and I/O terminals.
CAPACITANCE (T
A
= +25
O
C, f = 1.0MHz)
Symbol
Parameter
(1)
Conditions
Typ.
Max.
Unit
C
IN
Input Capacitance
V
IN
= 0V
4.5
6
pF
C
OUT
Output Capacitance
V
OUT
= 0V
5.5
8
pF
NOTE:
1. This parameter is measured at characterization but not tested.
PIN DESCRIPTION
Pin Names
Description
OE
A
, OE
B
3-State Output Enable Inputs (Active LOW)
IN
A
, IN
B
Clock Inputs
OAn, OBn
Clock Outputs
MON
Monitor Output
FUNCTION TABLE
(1)
Inputs
Outputs
OE
A
, OE
B
IN
A
, IN
B
OAn, OBn
MON
L
L
L
L
L
H
H
H
H
L
Z
L
H
H
Z
H
NOTE:
1. H = HIGH
L = LOW
Z = High-Impedance
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IDT49FCT3805/A
3.3V CMOS BUFFER/CLOCK DRIVER
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified
Commercial: T
A
= 0C to +70C, Industrial: T
A
= -40C to +85C, V
CC
= 3.3V 0.3V
Symbol
Parameter
Test Conditions
(1)
Min.
Typ.
Max.
Unit
V
IH
Input HIGH Level (Input pins)
Guaranteed Logic HIGH Level
2
--
5.5
V
Input HIGH Level (I/O pins)
2
--
V
CC
+ 0.5
V
IL
Input LOW Level (Input and I/O pins)
Guaranteed Logic LOW Level
0.5
--
0.8
V
I
IH
Input HIGH Current (Input pins)
V
CC
= Max.
V
I
= 5.5V
--
--
1
Input HIGH Current (I/O pins)
V
I
= V
CC
--
--
1
A
I
IL
Input LOW Current (Input pins)
V
CC
= Max.
V
I
= GND
--
--
1
Input LOW Current (I/O pins)
V
I
= GND
--
--
1
I
OZH
High Impedence Output Current
V
CC
= Max.
V
O
= V
CC
--
--
1
A
I
OZL
(3-State Output Pins)
V
O
= GND
--
--
1
V
IK
Clamp Diode Voltage
V
CC
= Min., I
IN
= 18mA
--
0.7
1.2
V
I
ODH
Output HIGH Current
V
CC
= 3.3V, V
IN
= V
IH
or V
IL
, V
O
= 1.5V
(3)
36
60
110
mA
I
ODL
Output LOW Current
V
CC
= 3.3V, V
IN
= V
IH
or V
IL
, V
O
= 1.5V
(3)
50
90
200
mA
V
OH
Output HIGH Voltage
V
CC
= Min.
I
OH
= 0.1mA
V
CC
0.2
--
--
V
IN
= V
IH
or V
IL
I
OH
= 8mA
2.4
(5)
3
--
V
V
OL
Output LOW Voltage
V
CC
= Min.
I
OL
= 0.1mA
--
--
0.2
V
IN
= V
IH
or V
IL
I
OL
= 16mA
--
0.2
0.4
V
I
OL
= 24mA
--
0.3
0.5
I
OFF
Input Power Off Leakage
V
CC
= 0V, V
IN
= 4.5V
--
--
1
A
I
OS
Short Circuit Current
(4)
V
CC
= Max., V
O
= GND
(3)
60
135
240
mA
V
H
Input Hysteresis
--
--
150
--
mV
I
CCL
Quiescent Power Supply Current
V
CC
= Max.
--
0.1
10
A
I
CCH
V
IN
= GND or V
CC
I
CCZ
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 Vcc = 3.3V, +25C 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.
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COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGE
IDT49FCT3805/A
3.3V CMOS BUFFER/CLOCK DRIVER
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
= 3.3V, +25C ambient.
3. Per TTL driven input (V
IN
= V
CC
-0.6V); all other inputs at V
CC
or GND.
4. This parameter is not directly testable, but is derived for use in Total Power Supply calculations.
5. Values for these conditions are examples of the I
C
formula. These limits are guaranteed but not tested.
6.
I
C
= I
QUIESCENT
+
I
INPUTS
+ I
DYNAMIC
I
C
= I
CC
+
I
CC
D
H
N
T
+ I
CCD
(f
O
N
O
)
I
CC
= Quiescent Current (I
CCL
, I
CCH
and I
CCZ
)
I
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
All currents are in milliamps and all frequencies are in megahertz.
POWER SUPPLY CHARACTERISTICS
Symbol
Parameter
Test Conditions
(1)
Min.
Typ.
(2)
Max.
Unit
I
CC
Quiescent Power Supply Current
V
CC
= Max.
--
10
30
A
TTL Inputs HIGH
V
IN
= V
CC
0.6V
(3)
I
CCD
Dynamic Power Supply Current
(4)
V
CC
= Max.
V
IN
= V
CC
--
0.035
0.06
mA/MHz
Outputs Open
V
IN
= GND
OE
A
= OE
B
= GND
Per Output Toggling
50% Duty Cycle
I
C
Total Power Supply Current
(6)
V
CC
= Max.
V
IN
= V
CC
--
0.9
1.6
Outputs Open
V
IN
= GND
f
O
= 25MHz
50% Duty Cycle
V
IN
= V
CC
0.6V
--
0.9
1.6
OE
A
= OE
B
= V
CC
V
IN
= GND
Mon. Output Toggling
V
CC
= Max.
V
IN
= V
CC
--
20
33
(5)
mA
Outputs Open
V
IN
= GND
f
O
= 50MHz
50% Duty Cycle
V
IN
= V
CC
0.6V
--
20
33
(5)
OE
A
= OE
B
= GND
V
IN
= GND
Eleven Outputs Toggling
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IDT49FCT3805/A
3.3V CMOS BUFFER/CLOCK DRIVER
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGE
NOTES:
1. See test circuits and waveforms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
3. t
PLH
, t
PHL
, t
SK
(t) 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.
SWITCHING CHARACTERISTICS OVER OPERATING RANGE - INDUSTRIAL
(3,4)
FCT3805
FCT3805A
Symbol
Parameter
Conditions
(1)
Min
.
(2)
Max
.
Min
.
(2)
Max
.
Unit
t
PLH
Propagation Delay
C
L
= 50pF
1.5
5.8
1.5
5.2
ns
t
PHL
IN
A
to OAn, IN
B
to OBn
R
L
= 500
t
R
Output Rise Time
--
2
--
2
ns
t
F
Output Fall Time
--
2
--
2
ns
t
SK(O)
Output skew: skew between outputs of all banks of
--
0.6
--
0.6
ns
same package (inputs tied together)
t
SK(P)
Pulse skew: skew between opposite transitions
--
1
--
1
ns
of same output (|t
PHL -
t
PLH
|)
t
SK(T)
Package skew: skew between outputs of different
--
1.5
--
1.2
ns
packages at same power supply voltage,
temperature, package type and speed grade
t
PZL
Output Enable Time
1.5
6.5
1.5
6
ns
t
PZH
OE
A
to OAn, OE
B
to OBn
t
PLZ
Output Disable Time
1.5
5.5
1.5
5
ns
t
PHZ
OE
A
to OAn, OE
B
to OBn
SWITCHING CHARACTERISTICS OVER OPERATING RANGE - COMMERCIAL
(3,4)
FCT3805
FCT3805A
Symbol
Parameter
Conditions
(1)
Min
.
(2)
Max
.
Min
.
(2)
Max
.
Unit
t
PLH
Propagation Delay
C
L
= 50pF
1.5
5.8
1.5
5
ns
t
PHL
IN
A
to OAn, IN
B
to OBn
R
L
= 500
t
R
Output Rise Time
--
2
--
2
ns
t
F
Output Fall Time
--
2
--
2
ns
t
SK(O)
Output skew: skew between outputs of all banks of
--
0.5
--
0.5
ns
same package (inputs tied together)
t
SK(P)
Pulse skew: skew between opposite transitions
--
1
--
1
ns
of same output (|t
PHL -
t
PLH
|)
t
SK(T)
Package skew: skew between outputs of different
--
1.5
--
1.2
ns
packages at same power supply voltage,
temperature, package type and speed grade
t
PZL
Output Enable Time
1.5
6.5
1.5
6
ns
t
PZH
OE
A
to OAn, OE
B
to OBn
t
PLZ
Output Disable Time
1.5
5.5
1.5
5
ns
t
PHZ
OE
A
to OAn, OE
B
to OBn
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