United States Patent No. RE44,134
4
Precision Edge®
SY89872U
Micrel, Inc.
M9999-082407
hbwhelp@micrel.com or (408) 955-1690
VCC = 2.5V ±5%; TA = –40°C to +85°C; Unless otherwise stated.
Symbol Parameter Condition Min Typ Max Units
VIH Input HIGH Voltage 2.0 – VCC V
VIL Input LOW Voltage 0 – 0.8 V
IIH Input HIGH Current –125 – 20 μA
IIL Input LOW Current – – –300 μA
Note 1. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established.
Note 2. Specification for packaged product only.
LVTTL/CMOS INPUTS DC ELECTRICAL CHARACTERISTICS(Note 1, 2)
VCC = 2.5V ±5%; TA = –40°C to +85°C; Unless otherwise stated.
Symbol Parameter Condition Min Typ Max Units
VOUT Output Voltage Swing Note 5 250 350 450 mV
VOH Output High Voltage Note 3 1.475 V
VOL Output Low Voltage Note 3 0.925 V
VOCM Output Common Mode Voltage Note 4 1.125 1.375 V
'VOCM Change in Common Mode Voltage –50 50 mV
Note 1. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established.
Note 2. Specification for packaged product only.
Note 3. Measured as per Figure 1a, 100ý across Q and /Q outputs.
Note 4. Measured as per Figure 1b.
Note 5. See Figure 1c.
LVDS OUTPUTS DC ELECTRICAL CHARACTERISTICS(Note 1, 2)
6
Precision Edge®
SY89872U
Micrel, Inc.
M9999-082407
hbwhelp@micrel.com or (408) 955-1690
TIMING DIAGRAM
LVDS OUTPUT
VOUT 100Ω
VOH,VOL
VOH,VOL
GND
Figure 1a. LVDS Differential Measurement
GND
50Ω
50Ω
V
OCM,
ΔV
OCM
Figure 1b. LVDS Common Mode Measurement
V
IN
Swing
/RESET
IN
/IN
/QB
QB
QA
/QA
t
PD
t
RR
V
CC/2
V
OUT
Swing
V
IN,
V
OUT
350mV
(typical)
Figure 1c. Single-Ended Swing
700mV (typical)
V
DIFF_IN
,V
DIFF_OUT
Figure 1d. Differential Swing
DEFINITION OF SINGLE-ENDED AND DIFFERENTIAL SWING
7
Precision Edge®
SY89872U
Micrel, Inc.
M9999-082407
hbwhelp@micrel.com or (408) 955-1690
TYPICAL OPERATING CHARACTERISTICS
VCC = 2.5V, VIN = 400mV, TA = 25°C, unless otherwise stated.
0
50
100
150
200
250
300
350
400
0
500
1000
1500
2000
2500
3000
3500
QA AMPLITUDE (mV)
FREQUENCY (MHz)
QA Output Amplitude
vs. Frequency
500
550
600
650
700
0
200
400
600
800
1000
1200
1400
PROPAGATION DELAY (ps)
INPUT SWING (mV)
IN to Q Propagation Delay
vs. Input Swing
500
525
550
575
600
-40 -20 0 20 40 60 80 100
PROPAGATION DELAY (ps)
TEMPERATURE (°C)
IN to Q Propagation Delay
vs. Temperature
QA
/QA
/QB0
QB0
QA @622MHz and QB @155.5MHz
(Divide-by-4)
TIME (1ns/div.)
Output Swing
(100mV/div.)
622MHz Output
155.5MHz Output
1.25GHz Output
TIME (150ps/div.)
/Q
Q
Output Swing
(50mV/div.)
2GHz Output
/Q
Q
TIME (100ps/div.)
Output Swing
(50mV/div.)
8
Precision Edge®
SY89872U
Micrel, Inc.
M9999-082407
hbwhelp@micrel.com or (408) 955-1690
INPUT BUFFER STRUCTURE
V
CC
GND
50Ω
50Ω
IN
V
T
/IN
1.86kΩ
1.86kΩ1.86kΩ
1.86kΩ
Figure 2a. Simplified Differential
Input Buffer
VCC
GND
S0
S1
/RESET
R25kΩ
R
Figure 2b. Simplified TTL/CMOS
Input Buffer
