Programmable Skew Clock Buffer (PSCB)
T
ABLE
5. 7B991 DC E
LECTRICAL
C
HARACTERISTICS
(V
CC
= 5V ±10%, T
A
= -40
TO
85°C,
UNLESS OTHERWISE SPECIFIED
)
P
ARAMETER
Input HIGH Current (Test, FS, xFn)
Input MID Current (Test, FS, xFn)
Input LOW Current (Test, FS, xFn)
Output Short Circuit (Test, FS, xFn)
2
7B991
S
UBGROUPS
1, 2, 3
1, 2, 3
1, 2, 3
1
1, 2, 3
1, 2, 3
M
IN
--
-200
--
--
--
--
M
AX
200
200
-200
-250
90
14
U
NIT
µA
µA
µA
mA
mA
mA
S
YMBOL
I
IH
I
IMM
I
ILL
I
OS
I
CCQ
I
CCN
T
EST
C
ONDITIONS
V
IN
= V
CC
V
IN
= 2.75
V
IN
= GND
V
CC
= Max., V
OUT
= GND
(25
°
C only)
V
CCN
= V
CCQ
= Max, all input
selects open
V
CCN
= V
CCQ
= Max,
I
OUT
= 0 mA,
Input selects open, fMAX
V
CCN
= V
CCQ
= Max,
I
OUT
= 0 mA
Input selects open, fMAX
Operating Current used by Internal
Circuitry
Output Buffer Current per Output
Pair
3
Power Dissipation per Output Pair
4
P
D
1, 2, 3
--
78
mW
Memory
1. These inputs are normally wired to V
CC
,GND, or left unconnected (actual threshold voltages vary as a percentage of V
CC
). Inter-
nal termination resistors hold unconnected inputs at V
CC
/2. If these inputs are switched, the function and timing of the outputs
may glitch and the PLL may require an additional t
LOCK
time before all datasheet limits are achieved.
2. This device should be tested one output at a time, output shorted for less than one second, less than 10% duty cycle. Room
temperature only.
3. Total output current per output pair can be approximated by the following expression that includes device current plus load cur-
rent:
ICCN = [(4 + 0.11F) + [((835-3F)/Z) + (.0022FC)]N] x 1.1
Where:
f = frequency in MHz
C = capacitive load in pF
Z = line impedance in ohms
N = number of loaded outputs; 0, 1, or 2
FC = F * C
4. Total power dissipation per output pair can be approximated by the following expression that includes device power dissipation
due to the load circuit:
PD = [(22 + 0.61F) + [((1550-2.7F)/Z) + (.0125FC)]N] x 1.1
T
ABLE
6. 7B991 C
APACITANCE1
P
ARAMETER
Input Capacitance
1. Guaranteed by design.
S
YMBOL
C
IN
T
EST
C
ONDITIONS
T
A
= 25
°
C, f = 1 MHz, V
CC
= 5.0V
M
AX
10
U
NIT
pF
09.23.02 Rev 4
All data sheets are subject to change without notice
4
©2002 Maxwell Technologies.
All rights reserved.
MAXWELL [ MAXWELL TECHNOLOGIES ]
