FAST CMOS
BUFFER/CLOCK DRIVER
Integrated Device Technology, Inc.
IDT49FCT3805/A
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
Available in DIP, SOIC, SSOP, QSOP, Cerpack and
LCC packages
• Military product compliant to MIL-STD-883, Class B
• V
CC
= 3.3V
±
0.3V
•
•
•
•
•
•
•
•
•
•
DESCRIPTION:
The FCT3805/A 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/A offers low
capacitance inputs with hysteresis.
The FCT3805/A is designed for high speed clock distribu-
tion where signal quality and skew are critical. The FCT 3805
also allows single point-to-point transmission line driving in
applications such as address distribution, where one signal
must be distributed to multiple receivers with low skew and
high signal quality.
FUNCTIONAL BLOCK DIAGRAM
PIN CONFIGURATIONS
V
CCA
OA
1
1
2
3
4
5
6
7
8
9
10
P20-1
D20-1
SO20-2
SO20-7
SO20-8
&
E20-1
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
3102 drw 02
OE
A
OA
2
OA
3
5
OA
1
-OA
5
GND
A
OA
4
OA
5
IN
A
IN
B
5
OB
1
-OB
5
GND
Q
OE
A
OE
B
MON
3102 drw 01
IN
A
DIP/SOIC/SSOP/QSOP/CERPACK
TOP VIEW
V
CCA
V
CCB
OA
2
OA
1
INDEX
3
OA
3
GND
A
OA
4
OA
5
GND
Q
4
5
6
7
8
2
1
20 19
18
17
OB
2
OB
3
GND
B
OB
4
OB
5
L20-2
OB
1
16
15
14
9 10 11 12 13
OE
A
OE
B
IN
A
IN
B
MON
3102 drw 03
LCC
TOP VIEW
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
MILITARY AND COMMERCIAL TEMPERATURE RANGES
©1996
Integrated Device Technology, Inc.
OCTOBER 1995
DSC-3102/4
9.5
1
IDT49FCT3805/A
FAST CMOS BUFFER/CLOCK DRIVER
MILITARY AND COMMERCIAL TEMPERATURE RANGES
PIN DESCRIPTION
Pin Names
OE
A
,
OE
B
IN
A
, IN
B
OA
n
, OB
n
MON
Description
3-State Output Enable Inputs (Active LOW)
Clock Inputs
Clock Outputs
Monitor Output
3102 tbl 01
FUNCTION TABLE
(1)
Inputs
Outputs
IN
A
, IN
B
L
H
L
H
OA
n
, OB
n
L
H
Z
Z
MON
L
H
L
H
3102 tbl 02
OE
A
,
OE
B
L
L
H
H
NOTE:
1. H = HIGH, L = LOW, Z = High Impedance
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
Rating
(2)
Terminal Voltage
V
TERM
with Respect to
GND
V
TERM(3)
Terminal Voltage
with Respect to
GND
V
TERM(4)
Terminal Voltage
with Respect to
GND
T
A
Operating
Temperature
T
BIAS
Temperature
Under Bias
T
STG
Storage
Temperature
I
OUT
DC Output
Current
Commercial
Military
–0.5 to +4.6 –0.5 to +4.6
Unit
V
CAPACITANCE
(T
A
= +25°C, f = 1.0MHz)
Symbol
Parameter
(1)
C
IN
Input
Capacitance
C
OUT
Output
Capacitance
Conditions
V
IN
= 0V
V
OUT
= 0V
Typ.
3.5
3.5
Max. Unit
5.0
pF
5.0
pF
3102 lnk 04
–0.5 to +7.0
–0.5 to +7.0
V
–0.5 to V
CC
+ 0.5
0 to +70
–55 to +125
–55 to +125
–60 to +60
–0.5 to V
CC
+ 0.5
–55 to +125
–65 to +135
–65 to +150
–60 to +60
V
°C
°C
°C
mA
NOTE:
1. This parameter is measured at characterization but not tested.
3102 lnk 03
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 ex-
tended periods may affect reliability.
2. Vcc terminals.
3. Input terminals.
4. Output and I/O terminals.
9.5
2
IDT49FCT3805/A
FAST CMOS BUFFER/CLOCK DRIVER
MILITARY AND COMMERCIAL TEMPERATURE RANGES
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Commercial: T
A
= 0°C to +70°C, V
CC
= 3.3V
±
0.3V; Military: T
A
= –55°C to +125°C, V
CC
= 3.3V
±
0.3V
Symbol
V
IH
V
IL
I
I H
I
I L
I
OZH
I
OZL
V
IK
I
ODH
I
ODL
V
OH
Parameter
Input HIGH Level (Input pins)
Input HIGH Level (I/O pins)
Input LOW Level
(Input and I/O pins)
Input HIGH Current (Input pins)
(6)
Input HIGH Current (I/O pins)
(6)
Input LOW Current (Input pins)
(6)
Input LOW Current (I/O pins)
(6)
High Impedance Output Current
(3-State Output pins)
(6)
Clamp Diode Voltage
Output HIGH Current
Output LOW Current
Output HIGH Voltage
V
CC
= Max.
V
CC
= Max.
V
I
= 5.5V
V
I
= V
CC
V
I
= GND
V
I
= GND
V
O
= V
CC
V
O
= GND
V
CC
= Min., I
IN
= –18mA
V
CC
= 3.3V, V
IN
= V
IH
or V
IL,
V
O
= 1.5V
(3)
V
CC
= 3.3V, V
IN
= V
IH
or V
IL,
V
O
= 1.5V
(3)
V
CC
= Min.
V
IN
= V
IH
or V
IL
V
OL
Output LOW Voltage
V
CC
= Min.
V
IN
= V
IH
or V
IL
I
OFF
I
OS
V
H
I
CCL
I
CCH
I
CCZ
Input Power Off Leakage
(6)
Short Circuit Current
(4)
Input Hysteresis
Quiescent Power Supply Current
V
CC
= Max.,
V
IN
= GND or V
CC
V
CC
= 0V, V
IN
≤
4.5V
V
CC
= Max., V
O
= GND
(3)
—
Test Conditions
(1)
Guaranteed Logic HIGH Level
Guaranteed Logic LOW Level
Min.
2.0
2.0
–0.5
—
—
—
—
—
—
—
–36
50
V
CC
–
0.2
2.4
(5)
—
—
—
—
–60
—
—
—
Typ.
(2)
—
—
—
—
—
—
—
—
—
–0.7
–60
90
—
3.0
—
0.2
0.3
—
–135
150
0.1
0.1
Max.
5.5
V
CC
+0.5
0.8
±1
±1
±1
±1
±1
±1
–1.2
–110
200
—
—
0.2
0.4
0.50
±1
–240
—
10
100
Unit
V
V
µA
µA
V
mA
mA
V
I
OH
= –0.1mA
I
OH
= –6mA MIL.
I
OH
= –8mA COM'L.
I
OL
= 0.1mA
I
OL
= 16mA
I
OL
= 24mA
V
µA
mA
mV
µA
COM'L.
MIL.
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, +25°C ambient.
3. Not more than one output should be tested at one time. Duration of the test should not exceed one second.
4. This parameter is guaranteed but not tested.
5. V
OH
= V
CC
-0.6V at rated current.
6. The test limit for this parameter is
±5µA
at TA = –55°C.
3102 lnk 05
9.5
3
IDT49FCT3805/A
FAST CMOS BUFFER/CLOCK DRIVER
MILITARY AND COMMERCIAL TEMPERATURE RANGES
POWER SUPPLY CHARACTERISTICS
Symbol
∆I
CC
I
CCD
Parameter
Quiescent Power Supply Current
TTL Inputs HIGH
Dynamic Power Supply Current
(4)
Test Conditions
(1)
V
CC
= Max.
V
IN
= V
CC
–0.6V
(3)
V
CC
= Max.
Outputs Open
OE
A
=
OE
B
= GND
Per Output Toggling
50% Duty Cycle
V
CC
= Max.
Outputs Open
fo = 25MHz
50% Duty Cycle
OE
A
=
OE
B
=V
CC
Mon. Output Toggling
V
CC
= Max.
Outputs Open
fo = 50MHz
50% Duty Cycle
OE
A
=
OE
B
= GND
Eleven Outputs
Toggling
V
IN
= V
CC
V
IN
= GND
Min.
—
—
Typ.
(2)
2.0
0.035
Max.
30
0.06
Unit
µA
mA/
MHz
I
C
Total Power Supply Current
(6)
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
—
0.9
1.6
mA
—
0.9
1.6
—
20.0
33.0
(5)
—
20.0
33.0
(5)
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, +25°C 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.
3102 tbl 06
9.5
4
IDT49FCT3805/A
FAST CMOS BUFFER/CLOCK DRIVER
MILITARY AND COMMERCIAL TEMPERATURE RANGES
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
(3,4)
FCT3805
Com'l.
Mil.
Symbol
Parameter
t
PLH
Propagation Delay
IN
A
to OA
n
, IN
B
to OB
n
t
PHL
t
R
Output Rise Time
t
F
t
SK
(o)
t
SK
(p)
t
SK
(t)
Output Fall Time
Output skew: skew between outputs of all
banks of same package (inputs tied together)
Pulse skew: skew between opposite
transitions of same output (|t
PHL
–t
PLH
|)
Package skew: skew between outputs of
different packages at same power supply
voltage, temperature, package type and
speed grade
Output Enable Time
OE
A
to OA
n
,
OE
B
to OB
n
Output Disable Time
OE
A
to OA
n
,
OE
B
to OB
n
FCT3805A
Com'l.
Mil.
Unit
ns
ns
ns
ns
ns
ns
Condition
(1)
Min
.(2)
Max. Min
.(2)
Max
.
Min
.(2)
Max. Min.
(2)
Max.
C
L
= 50pF
1.5
5.8
1.5
5.0
R
L
= 500Ω
—
2.0
—
—
2.0
—
—
—
—
—
2.0
0.7
1.2
1.5
—
—
—
—
—
—
—
—
2.0
0.5
1.0
1.2
—
—
—
—
t
PZL
t
PZH
t
PLZ
t
PHZ
1.5
1.5
6.5
5.5
1.5
1.5
6.0
5.0
ns
ns
3102 tbl 07
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) 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.
9.5
5
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