NSC 11C91DCQR, 11C90DCQR Datasheet
11C90/11C91 650 MHz Prescalers
11C90/11C91
650 MHz Prescalers
General Description
The 11C90 and 11C91 are high-speed prescalers designed
specifically for communication and instrumentation applications. All discussions and examples in this data sheet are
applicable to the 11C91 as well as the 11C90.
The 11C90 will divide by 10 or 11 and the 11C91 by 5 or 6,
both over a frequency range from DC to typically 650 MHz.
The division ratio is controlled by the Mode Control. The
divide-by-10 or -11 capability allows the use of pulse swallowing techniques to control high-speed counting modulos
by lower-speed circuits. The 11C90 may be used with either
ECL or TTL power supplies.
In addition to the ECL outputs Q and Q
an ECL-to-TTL converter and a TTL output. The TTL output
operates from the same V
but a separate pin is used for the TTL circuit V
mizes noise coupling when the TTL output switches and
CC
Logic Symbol
, the 11C90 contains
and VEElevels as the counter,
. This mini-
EE
Not Intended For New Designs
August 1992
also allows power consumption to be reduced by leaving
the separate V
To facilitate capacitive coupling of the clock signal, a 400X
resistor (V
Connecting this resistor to the Clock Pulse input (CP) automatically centers the input about the switching threshold.
Maximum frequency operation is achieved with a 50% duty
cycle.
Each of the Mode Control inputs is connected to an internal
2kXresistor with the other end uncommitted (RM
RM
). An M input can be driven from a TTL circuit operating
2
from the same V
ciated 2 kX resistor to V
from the ECL circuit, the 2 kX resistor can be left open or, if
required, can be connected to V
resistor.
pin open if the TTL output is not used.
EE
) is connected internally to the VBBreference.
REF
by connecting the free end of the asso-
CC
. When an M input is driven
CCA
to act as a pull-down
EE
and
1
Connection Diagram
16-Pin DIP
TL/F/9892– 2
Pin Names Description
CE Count Enable Input (Active LOW)
CP Clock Pulse Input
M
n
MS Asynchronous Master Set Input
Q, Q
QTTL TTL Output
RM
n
V
REF
C
1995 National Semiconductor Corporation RRD-B30M115/Printed in U. S. A.
Count Modulus Control Input
ECL Outputs
2kXResistor to M
400X Resistor to V
TL/F/9892
n
BB
TL/F/9892– 1
Absolute Maximum Ratings
Above which the useful life may be impaired
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Storage Temperature
Maximum Junction Temperature (TJ)
Supply Voltage Range
Input Voltage (DC) V
Output Current (DC Output HIGH)
Operating Range
b
65§Ctoa150§C
a
b
7.0V to GND
to GND
EE
b
b
5.7V tob4.7V
150§C
50 mA
Recommended Operating
Conditions
Ambient Temperature (T
Commercial 0
Military
Supply Voltage (V
Commercial
Military
)
A
)
EE
Lead Temperature
(Soldering, 10 sec.) 300
C
§
TTL Input/Output Operation
DC Electrical Characteristics
Over Operating Temperature and Voltage Range unless otherwise noted, Pins 12 and 13eGND
Symbol Parameter Min
V
IH
V
IL
V
OH
V
OL
I
IL
I
SC
Input HIGH Voltage
and M2Inputs Voltage (Note 4), V
M
1
Input LOW Voltage
and M2Inputs Voltage (Note 4), V
M
1
Output HIGH Voltage
QTTL Output I
Output LOW Voltage
QTTL Output I
Input LOW Current
and M2Inputs V
M
1
Output Short Circuit
Current V
2.3 3.3 V
b
20
Typ
(Note 3)
Max Units Conditions
4.1 V
3.3 V
0.2 0.5 V
b
2.3
b
35
b
5.0 mA
b
80 mA
Guaranteed Input HIGH Threshold
Guaranteed Input LOW Threshold
e
V
V
CC
eb
OH
e
V
V
CC
e
20.0 mA
OL
e
V
V
CC
e
0.4V, Pins 6, 7eV
IN
e
V
V
CC
e
OUT
Min Typ Max
C
§
b
55§C
b
5.7Vb5.2V
b
5.7Vb5.2V
CC
CC
e
Min,
CCA
640 mA
e
Min,
CCA
e
Max,
CCA
e
Max,
CCA
0.0V, Pin 14eV
a
e
V
CCA
e
V
CCA
CC
CC
a
125§C
b
b
e
e
75§C
4.7V
4.7V
5.0V
5.0V
AC Electrical Characteristics
e
V
CCA
e
5.0V Nominal, V
V
CC
e
GND, T
EE
A
ea
25§C
Symbol Parameter Min Typ Max Units Conditions
t
PLH
t
PHL
t
PLH
t
s
t
h
t
TLH
t
THL
f
MAX
Propagation Delay, (50% to 50%)
CP to QTTL
Propagation Delay, (50% to 50%)
MS to QTTL
61014 ns
12 17 ns
Mode Control Setup Time 4 2 ns
Mode Control Hold Time 0
Output Rise Time
(20% to 80%)
Output Fall Time
(80% to 20%)
Count Frequency 550 650
600 650 0
b
2ns
10 ns
2ns
MHz
See
Figure 1
b
55§Ctoa125§C
Ctoa75§C
§
Clock Input AC Coupled
350 mV Peak-to-Peak
Sinewave (Note 5)
2
ECL OperationÐCommercial Version
DC Electrical Characteristics
e
V
CC
e
V
GND, V
CCA
Symbol Parameter Min Typ Max Units T
V
OH
V
OL
V
IH
V
IL
I
IH
Output HIGH Voltage
Q and Q
Output LOW Voltage
Q and Q
Input HIGH Voltage
Input LOW Voltage
Input HIGH Current V
CP Input (Note 1) 400
MS Input 400 mA
M
and M2Input 250
1
I
IL
I
EE
V
EE
V
REF
Input LOW Current 0.5 mA
Power Supply Current
Operating Supply
Voltage Range
Reference Voltage
EE
eb
5.2V
b
b
b
b
b
b
b
b
b
b
b
b
b
b
1060
1025
980
1820
1135
1095
1035
1870
1850
1830
110
119
5.7
1550
b
995
b
960
b
910
b
1705
b
75 mA
b
5.2
b
905 0§C Loade50X tob2V
b
880 mV
b
805
b
1620 mV
b
840 0§C Guaranteed Input HIGH
b
810 mV
b
720
b
1500 0§C Guaranteed Input LOW
b
1485 mV
b
1460
b
4.7 V
b
1150 mV
a
a
0
a
a
a
a
a
a
a
a
a
0
a
0
a
a
A
Conditions
25§C
75§C
Cto
§
75§C
25§C Signal (Note 6)
75§C
25§C Signal
75§C
e
V
IN
25§C
IHA
25§C
25§C
25§CV
C to Pins 6, 7, 13 not connected
§
e
V
IN
ILB
75§C
Cto
§
75§C
e
eb
25§C
V
I
N
RM
eb
1
V
RM
10.0 mA
5.2V
2
AC Electrical Characteristics
e
T
A
0§Cto
a
75§C, V
CC
e
e
V
GND, V
CCA
Symbol Parameter
t
t
t
t
t
t
t
f
PLH
PHL
PLH
s
h
TLH
THL
MAX
Propagation Delay,
(50% to 50%) CP to Q R
Propagation Delay,
(50% to 50%) MS to Q
Setup Time, M to CP 2.0 4.0 2.0 2.0 ns (20% to 80%)
Hold Time, M to CP
b
Output Rise Time
(20% to 80%)
Output Fall Time
(80% to 20%)
Maximum Clock Frequency AC Coupled Input 350 mV
eb
5.2V
EE
0
Typ
C
§
a
25§C
Min Typ Max
1.8 1.3 2.0 3.0 2.5 ns
a
75§C
Typ
Units Conditions
Output:
L
3.7 4.0 6.0 4.5 ns Input:
t
ri
2.0 0.0
b
2.0
b
2.0 ns
See
1.0 1.0 2.0 1.0 ns
1.0 1.0 2.0 1.0 ns
650 600 650 625 MHz
Peak-to-Peak. f
Guaranteed to be 575 MHz
Min at 0
3
e
50X tob2.0V
e
e
t
fi
Figure 1
Ctoa75§C.
§
2.0g0.1 ns
MAX
is
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