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IDT49FCT20805
2.5V CMOS DUAL 1-TO-5 CLOCK DRIVER INDUSTRIAL TEMPERATURE RANGE
MAY 2010
2007 Integrated Device Technology, Inc. DSC-6172/113c
IDT49FCT20805
INDUSTRIAL TEMPERATURE RANGE
2.5V CMOS DUAL
1-TO-5 CLOCK DRIVER
FUNCTIONAL BLOCK DIAGRAM
FEATURES:
• 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
•VCC = 2.5V ± 0.2V
• Available in SSOP, QSOP, and VFQFPN packages
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
DESCRIPTION:
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.
5OA1-OA
5
OB1-OB
5
OEA
INA
OEB
INB
MON
5
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INDUSTRIAL TEMPERATURE RANGE
IDT49FCT20805
2.5V CMOS DUAL 1-TO-5 CLOCK DRIVER
CAPA CITANCE (TA = +25OC, f = 1.0MHz)
Symbol Parameter(1) Conditions Typ. Max. Unit
CIN Input Capacitance VIN = 0V 3 4 pF
COUT Output Capacitance VOUT = 0V — 6 pF
NOTE:
1. This parameter is measured at characterization but not tested.
PIN DESCRIPTION
Pin Names Description
OEA, OEB3-State Output Enable Inputs (Active LOW)
INA, INBClock Inputs
OAn, OBn Clock Outputs
MON Monitor Output
FUNCTION TABLE (1)
Inputs Outputs
OEA, OEBINA, INBOAn, OBn MON
LLLL
LHHH
HLZL
HHZH
NOTE:
1. H = HIGH
L = LOW
Z = High-Impedance
ABSOLUTE MAXIMUM RATINGS(1)
Symbol Description Max Unit
VCC Input Power Supply Voltage –0.5 to +4.6 V
VIInput Voltage –0.5 to +5.5 V
VOOutput Voltage –0.5 to VCC+0.5 V
TJJunction Temperature 150 °C
TSTG Storage Temperature –65 to +165 °C
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.
PIN CONFIGURATIONS
SSOP/ QSOP
TOP VIEW VFQFPN
TOP VIEW
OA
1
V
CCA
OA3
OA2
GNDA
1
2
3
4
5
OB4
MON
IN
B
OE
B
OB5
11
12
13
14
15
OA4
OA5
GND
Q
IN
A
OE
A
678910
OB3
GNDB
V
CCB
OB
1
OB
2
1617181920
OA1
OA3
OA4
GNDQ
INA
VCCA
OA2
GNDA
OA5
OEA
1
2
3
4
5
6
7
8
9
OB3
OB4
MON
INB
VCCB
OB1
OB2
GNDB
OB5
OEB
11
12
13
14
15
16
17
18
19
20
10
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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: TA = -40°C to +85°C, VCC = 2.5V ± 0.2V
Symbol Parameter Test Conditions(1) Min. Typ.(2) Max. Unit
VIH Input HIGH Level 1.7 — 5.5 V
VIL Input LOW Level –0.5 — 0.7 V
IIH Input HIGH Current VCC = Max. VI = 5.5V — — ±1
IIL Input LOW Current VCC = Max. VI = GND — — ±1µA
IOZH High Impedance Output Current VCC = Max. VO = VCC ——±1
IOZL (3-State Outputs Pins) VO = GND — — ±1
VIK Clamp Diode Voltage VCC = Min., IIN = –18mA — –0.7 –1.2 V
IODH Output HIGH Current VCC = 2.5V, VIN = VIH or VIL, VO = 1.25V(3,4) –15 –35 –90 mA
IODL Output LOW Current VCC = 2.5V, VIN = VIH or VIL, VO = 1.25V(3,4) 25 55 100 mA
IOS Short Circuit Current VCC = Max., VO = GND(3,4) –30 –50 –120 mA
VOH Output HIGH Voltage VCC = Min. IOH = –8mA 1.7(5) —— V
VIN = VIH or VIL IOH = –100µAVCC - 0.2 — —
VOL Output LOW Voltage VCC = Min. IOL = 8 m A — 0.2 0.4 V
VIN = VIH or VIL IOL = 100µA — — 0.2
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 = 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. VOH = Vcc -0.6V at rated current.
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INDUSTRIAL TEMPERATURE RANGE
IDT49FCT20805
2.5V CMOS DUAL 1-TO-5 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 VCC = 2.5V, +25°C ambient.
3. This parameter is not directly testable, but is derived for use in Total Power Supply calculations.
4. IC = IQUIESCENT + IINPUTS + IDYNAMIC
IC = ICC + ∆ICC DHNT + ICCD (fONO)
ICC = Quiescent Current (ICCL, ICCH and ICCZ)
∆ICC = Power Supply Current for a TTL High Input (VIN = VCC -0.6V)
DH = Duty Cycle for TTL Inputs High
NT = Number of TTL Inputs at DH
ICCD = Dynamic Current Caused by an Input Transition Pair (HLH or LHL)
fO = Output Frequency
NO = Number of Outputs at fO
POWER SUPPLY CHARACTERISTICS
Symbol Parameter Test Conditions(1) Min. Typ.(2) Max. Unit
ICCL Quiescent Power Supply Current VCC = Max. — 0.1 20 µA
ICCH VIN = GND or VCC
ICCZ
∆ICC Power Supply Current per Input HIGH VCC = Max. — 35 250 µA
VIN = VCC –0.6V
ICCD Dynamic Power Supply Current VCC = Max. VIN = VCC — 65 100 µA/MHz
per Output(3) CL = 15pF VIN = GND
All Outputs Toggling
ICTotal Power Supply Current(4) VCC = Max. VIN = VCC — 100 125
CL = 15pF VIN = GND
All Outputs Toggling VIN = VCC –0.6V — 100 125
fi = 133MHz VIN = GND mA
VCC = Max. VIN = VCC — 115 150
CL = 15pF VIN = GND
All Outputs Toggling VIN = VCC –0.6V — 115 150
fi = 166MHz VIN = GND
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IDT49FCT20805
2.5V CMOS DUAL 1-TO-5 CLOCK DRIVER INDUSTRIAL TEMPERATURE RANGE
NOTES:
1. See test circuits and waveforms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
3. tPLH and tPHL are production tested. All other parameters guaranteed but not production tested.
4. Propagation delay range indicated by Min. and Max. limit is due to VCC, 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 tPHL and tPLH of same outputs under identical load conditions.
7. Part to part skew for all outputs given identical transitions and load conditions at identical VCC levels and temperature.
8. Airflow of 1m/s is recommended for frequencies above 133MHz.
9. This parameter is measured using f = 1MHz.
Symbol Parameter Conditions(1,8) Min.(2) Max.Unit
tPLH Propagation Delay CL = 15pF 0.5 2.5 ns
tPHL INA to OAn, INB to OBn 133MHz ≤ f ≤ 166MHz
tROutput Rise Time (0.7V to 1.7V) — 1.25 ns
tFOutput Fall Time (1.7V to 0.7V) — 1.25 ns
tSK(O) Same device output pin to pin skew(5) — 200 ps
tSK(P) Pulse skew(6,9) — 270 ps
tSK(PP) Part to part skew(7) — 550 ps
tPZL Output Enable Time — 5.2 ns
tPZH OEA to OAn, OEB to OBn
tPLZ Output Disable Time — 5.2 ns
tPHZ OEA to OAn, OEB to OBn
fMAX Input Frequency — 166 MHz
SWITCHING CHARACTERISTICS OVER OPERATING RANGE(3,4)
Symbol Parameter Conditions(1) Min.(2) Max.Unit
tPLH Propagation Delay CL = 15pF 1 3 ns
tPHL INA to OAn, INB to OBn f ≤ 133MHz
tROutput Rise Time (0.8V to 2V) — 1.5 ns
tFOutput Fall Time (2V to 0.8V) — 1.5 ns
tSK(O) Same device output pin to pin skew(5) — 270 ps
tSK(P) Pulse skew(6,9) — 270 ps
tSK(PP) Part to part skew(7) — 550 ps
tPZL Output Enable Time — 5.2 ns
tPZH OEA to OAn, OEB to OBn
tPLZ Output Disable Time — 5.2 ns
tPHZ OEA to OAn, OEB to OBn
fMAX Input Frequency — 133 MHz
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INDUSTRIAL TEMPERATURE RANGE
IDT49FCT20805
2.5V CMOS DUAL 1-TO-5 CLOCK DRIVER
CL = 15pF Test Circuit
TEST CIRCUITS AND WAVEFORMS
Enable and Disable Time Circuit
Test Switch
Disable Low 4.6V
Enable Low
Disable High GND
Enable High
SWITCH POSITION
Output Skew - tSK(O)
TEST CONDITIONS
Symbol VCC = 2.5V ±0.2V Unit
CL15 pF
RTZOUT of pulse generator Ω
RL33 Ω
tR / tF1 (0V to 2.5V or 2.5V to 0V) n s
DEFINITIONS:
CL = Load capacitance: includes jig and probe capacitance.
RT = Termination resistance: should be equal to ZOUT of the Pulse Generator.
tR / tF = Rise/Fall time of the input stimulus from the Pulse Generator.
tPLH1
OUTPUT 1
OUTPUT 2
tSK(o)
tPLH2
2.5V
0V
VOH
1.25V
1.25V
VOL
VOH
1.25V
VOL
INPUT
tPHL1
tPHL2
tSK(o)
tSK(o) =|tPLH2 - tPLH1|or |tPHL2 - tPHL1|
CL
VOUT
VCC
Pulse
Generator D.U.T
VIN
RT
RL
VCC
Pulse
Generator D.U.T
VIN
RT
CL
4.6V
GND
VOUT
RL
500
500
Open
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IDT49FCT20805
2.5V CMOS DUAL 1-TO-5 CLOCK DRIVER INDUSTRIAL TEMPERATURE RANGE
Enable and Disable Times Part-to-Part Skew - tSK(PP)
NOTE:
1. Diagram shown for input Control Enable-LOW and input Control Disable-HIGH
Propagation Delay
TEST CIRCUITS AND WAVEFORMS
Pulse Skew
Part-to-Part Skew is for the same package and speed grade.
CONTROL
INPUT
OUTPUT
NORMALLY
LOW
OUTPUT
NORMALLY
HIGH
2.5V
1.25V
0V
VOH
VOL
SWITCH
CLOSED
SWITCH
OPEN
VOH
0.3V
0.3V
tPLZ
tPZL
tPZH tPHZ
VOH
VOL
1.25V
1.25V
ENABLE DISABLE INPUT
tPLH1
PACKAGE 1
OUTPUT
tSK(PP)
tPLH2
1.25V
VOL
tPHL2
tSK(PP) =|tPLH2 - tPLH1|or |tPHL2 - tPHL1|
PACKAGE 2
OUTPUT
2.5V
0V
VOH
1.25V
1.25V
VOL
VOH
tPHL1
2.5V
0V
VOH
tPLH tPHL
VOL
1.25V
1.25V
tRtF
1.7V
0.7V
INPUT
OUTPUT
2.5V
0V
VOH
tPLH tPHL
VOL
1.25V
1.25V
INPUT
OUTPUT
tSK(P) =|tPLH - tPLH|
VOL
tSK(PP)
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INDUSTRIAL TEMPERATURE RANGE
IDT49FCT20805
2.5V CMOS DUAL 1-TO-5 CLOCK DRIVER
ORDERING INFORMATION
CORPORATE HEADQUARTERS for SALES: for Tech Support:
6024 Silver Creek Valley Road 800-345-7015 or 408-284-8200 clockhelp@idt.com
San Jose, CA 95138 fax: 408-284-2775
www.idt.com
IDT49FCT X
PackageDevice Type
20805 2.5V CMOS Dual 1-to-5 Clock Driver
PY
PYG
Q
QG
NDG
Shrink Small Outline IC
SSOP - Green
Quarter-size Small Outline IC
QSOP - Green
VeryFinePitchQuadFlatPack-Green
XXXX X
Process
I-40°C to +85°C (Industrial)
