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For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
HIGH SPEED LOGIC - SMT
1
HMC679LC3C
v06.0514
26 GHz, T FLIP-FLOP w/ RESET &
PROGRAMMABLE OUTPUT VOLTAGE
The HMC679LC3C is a T Flip-Flop w/Reset desig-
ned to support clock frequencies as high as 26
GHz. During normal operation, with the reset pin not
asserted, the output toggles from its prior state on the
positive edge of the clock. This results in a divide-by-
two function of the clock input. Asserting the reset
pin forces the Q output low regardless of the clock
edge state (asynchronous reset assertion). Reversing
the clock inputs allows for negative-edge triggered
applications.
All differential inputs to the HMC679LC3C are CML and
terminated on-chip with 50 Ohms to the positive supply,
GND, and may be DC or AC coupled. Outputs can be
connected directly to a 50 Ohm ground-terminated
system or drive devices with CML logic input. The
HMC679LC3C also features an ouput level control pin,
VR, which allows for loss compensation or signal level
optimization. The HMC679LC3C operates from a single
-3.3 V supply and is available in ROHS-compliant 3x3
mm SMT package.
General Description
Features
Functional Diagram
Supports Clock Frequencies up to 26 GHz
Differential or Single-Ended Operation
Fast Rise and Fall Times: 18 / 17 ps
Low Power Consumption: 270 mW typ.
Programmable Differential Output Voltage Swing:
600 - 1100 mVp-p
Propagation Delay: 95 ps
Single Supply: -3.3 V
16 Lead Ceramic 3 x 3 mm SMT Package: 9 mm2
Typical Applications
The HMC679LC3C is ideal for:
• Serial Data Transmission up to 26 Gbps
• High Speed Frequency Divider (up to 26 GHz)
• Broadband Test & Measurement
• RF ATE Applications
Electrical Specications, TA = +25 ºC, Vee = -3.3 V, VR = 0 V
Parameter Conditions Min. Typ. Max Units
Power Supply Voltage -3.6 -3.3 -3.0 V
Power Supply Current 82 mA
Maximum Clock Rate 26 GHz
Input Voltage Range -1.5 0.5 V
Input Differential Range 0.1 2.0 Vp-p
Input Return Loss Frequency <23 GHz 10 dB
Output Amplitude Single-Ended, peak-to-peak 550 mVp-p
Differential, peak-to-peak 110 0 mVp-p
Output High Voltage -10 mV
Output Low Voltage -560 mV
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
HIGH SPEED LOGIC - SMT
2
HMC679LC3C
v06.0514
26 GHz, T FLIP-FLOP w/ RESET &
PROGRAMMABLE OUTPUT VOLTAGE
Electrical Specications (continued)
Parameter Conditions Min. Typ. Max Units
Output Rise / Fall Time Differential, 20% - 80% 18 / 17 ps
Output Return Loss Frequency <13 GHz 10 dB
Random Jitter Jr rms [1] 0.2 ps rms
Deterministic Jitter, Jd peak-to-peak, 215-1 PRBS input [2] 2 ps, p-p
Propagation Delay Clock to Q, td 95 ps
Propagation Delay Reset to Q, tdr 125 ps
VR Pin Current VR = 0.0 V 2 mA
VR Pin Current VR = +0.4 V 3.5 mA
[1] Upper limit of random jitter, JR, determined by measuring and integrating output phase noise with a sinusodal input at 5, 10, and 13.5 GHz over
temperature.
[2] Deterministic jitter calculated by simultaneously measuring the jitter of a 200 mV, 12.5 GHz, 215-1 PRBS input, and a single-ended output
DC Current vs. Supply Voltage [1][2]
[1] VR = 0.0 V [2] Frequency = 13 GHz [3] Frequency = 24 GHz
60
65
70
75
80
85
90
95
100
-3.7 -3.6 -3.5 -3.4 -3.3 -3.2 -3.1 -3 -2.9
+25 C
+85 C
-40 C
DC CURRENT (mA)
SUPPLY VOLTAGE (V)
Output Differential Voltage vs.
Supply Voltage [1][2]
Rise / Fall Time vs. Supply Voltage [1][3]
12
14
16
18
20
22
-3.7 -3.6 -3.5 -3.4 -3.3 -3.2 -3.1 -3 -2.9
tr
tf
RISE/FALL TIME (ps)
SUPPLY VOLTAGE (V)
Output Differential Voltage
vs. Input Frequency [1]
800
900
1000
1100
1200
1300
1400
1500
-3.7 -3.6 -3.5 -3.4 -3.3 -3.2 -3.1 -3 -2.9
+25C
+85C
-40C
VOUT DIFFERENTIAL (mVp-p)
SUPPLY VOLTAGE (V)
400
500
600
700
800
900
1000
1100
1200
8 12 16 20 24 28 32 36
VOUT DIFFERENTIAL (mVp-p)
INPUT FREQUENCY (GHz)
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
HIGH SPEED LOGIC - SMT
3
HMC679LC3C
v06.0514
26 GHz, T FLIP-FLOP w/ RESET &
PROGRAMMABLE OUTPUT VOLTAGE
Input Return Loss vs. Frequency [4]
Output Differential Voltage vs. VR [2] Rise / Fall Time vs. VR [3]
10
12
14
16
18
20
-1.2 -1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4
tr
tf
RISE/FALL TIME (ps)
VR (V)
[1] VR = 0.0 V [2] Frequency = 13 GHz [3] Frequency = 24 GHz [4] Device measured on evaluation board with single-
ended, time-domain gating
500
600
700
800
900
1000
1100
1200
1300
1400
-1.2 -1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4
+25 C
+85 C
-40 C
VOUT DIFFERENTIAL (mVp-p)
VR (V)
Output Return Loss vs. Frequency [4]
Reset Input Return Loss vs. Frequency [4]
-40
-35
-30
-25
-20
-15
-10
-5
0
5
0 4 8 12 16 20 24 28
Eval Board
Device
RETURN LOSS (dB)
FREQUENCY (GHz)
-40
-35
-30
-25
-20
-15
-10
-5
0
5
0 2 4 6 8 10 12 14
Eval Board
Device
RETURN LOSS (dB)
FREQUENCY (GHz)
-40
-35
-30
-25
-20
-15
-10
-5
0
0 2 4 6 8 10 12 14
Eval Board
Device
RETURN LOSS (dB)
FREQUENCY (GHz)
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
HIGH SPEED LOGIC - SMT
4
HMC679LC3C
v06.0514
26 GHz, T FLIP-FLOP w/ RESET &
PROGRAMMABLE OUTPUT VOLTAGE
Output Waveform
Timing Diagram
[1] Test Conditions:
Waveform generated with a CW signal source input at 26 GHz.
Diagram data presented on a Tektronix CSA 8000.
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
HIGH SPEED LOGIC - SMT
5
HMC679LC3C
v06.0514
26 GHz, T FLIP-FLOP w/ RESET &
PROGRAMMABLE OUTPUT VOLTAGE
Absolute Maximum Ratings
ELECTROSTATIC SENSITIVE DEVICE
OBSERVE HANDLING PRECAUTIONS
Outline Drawing
Power Supply Voltage (Vee) -3.75 V to +0.5 V
Input Signals -2 V to +0.5 V
Output Signals -1.5 V to +1 V
Continuous Pdiss (T = 85 °C)
(derate 17 mW/°C above 85 °C) 0.68 W
Thermal Resistance (Rth l-p) Worst
Case Junction to Package Paddle 59 °C/W
Maximum Junction Temperature 125 °C
Storage Temperature -65 °C to +150 °C
Operating Temperature -40 °C to +85 °C
ESD Sensitivity (HBM) Class 1C
NOTES:
1. PACKAGE BODY MATERIAL: ALUMINA
2. LEAD AND GROUND PADDLE PLATING:
30-80 MICROINCHES GOLD OVER 50 MICROINCHES MINIMUM NICKEL.
3. DIMENSIONS ARE IN INCHES [MILLIMETERS].
4. LEAD SPACING TOLERANCE IS NON-CUMULATIVE.
5. PACKAGE WARP SHALL NOT EXCEED 0.05 mm DATUM -C-
6. ALL GROUND LEADS MUST BE SOLDERED TO PCB RF GROUND.
7. PADDLE MUST BE SOLDERED TO Vee.
Package Information
Part Number Package Body Material Lead Finish MSL Rating Package Marking [2]
HMC679LC3C Alumina, White Gold over Nickel MSL3 [1] H679
XXXX
[1] Max peak reow temperature of 260 °C
[2] 4-Digit lot number XXXX
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
HIGH SPEED LOGIC - SMT
6
HMC679LC3C
v06.0514
26 GHz, T FLIP-FLOP w/ RESET &
PROGRAMMABLE OUTPUT VOLTAGE
Pin Descriptions
Pin Number Function Description Interface Schematic
1, 4, 5, 8, 9, 12 GND Signal Grounds
2, 3 R P, R N Differential Reset Inputs: Current Mode Logic (CML)
referenced to positive supply.
6, 7 C P, C N Differential Clock Inputs: Current Mode Logic (CML)
referenced to positive supply.
10, 11 QN, QP Differential Clock Outputs: Current Mode Logic (CML)
referenced to positive supply.
13, 16 GND Supply Ground
14 VR
Output level control. Output level may be increased
or decreased by applying a voltage to VR per “Output
Differential vs. VR” plot.
15,
Package Base Vee This pin and the exposed paddle must be
connected to the negative voltage supply.
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
HIGH SPEED LOGIC - SMT
7
HMC679LC3C
v06.0514
26 GHz, T FLIP-FLOP w/ RESET &
PROGRAMMABLE OUTPUT VOLTAGE
Evaluation PCB
The circuit board used in the application should use
RF circuit design techniques. Signal lines should
have 50 Ohm impedance while the package gro-
und leads should be connected directly to the
ground plane similar to that shown. The exposed
packaged base should be connected to Vee. A
sufficient number of via holes should be used to
connect the top and bottom ground planes. The
evaluation circuit board shown is available from Hit-
tite upon request. Install jumper on JP1 to short VR
to GND for normal operation.
List of Materials for Evaluation PCB 123585 [1]
Item Description
J1, J2, J5, J6 PCB Mount SMA RF Connectors
J3, J4 PCB Mount 2.92mm RF Connectors
J7 - J9 DC Pin
JP1 0.1” Header with Shorting Jumper
C1, C2 100 pF Capacitor, 0402 Pkg.
C3, C4 4.7 µF Capacitor, Tantalum
R1 10 Ohm Resistor, 0603 Pkg.
U1 HMC679LC3C
PCB [2] 118775 Evaluation Board
[1] Reference this number when ordering complete evaluation PCB
[2] Circuit Board Material: Arlon 25FR or Rogers 4350
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
HIGH SPEED LOGIC - SMT
8
HMC679LC3C
v06.0514
26 GHz, T FLIP-FLOP w/ RESET &
PROGRAMMABLE OUTPUT VOLTAGE
Application Circuit
