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National Semiconductor Electronic Components Datasheet

11C90 Datasheet

650 MHz Prescalers

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Not Intended For New Designs
August 1992
11C90 11C91
650 MHz Prescalers
General Description
The 11C90 and 11C91 are high-speed prescalers designed
specifically for communication and instrumentation applica-
tions 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 swal-
lowing 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 the 11C90 contains
an ECL-to-TTL converter and a TTL output The TTL output
operates from the same VCC and VEE levels as the counter
but a separate pin is used for the TTL circuit VEE This mini-
mizes noise coupling when the TTL output switches and
also allows power consumption to be reduced by leaving
the separate VEE pin open if the TTL output is not used
To facilitate capacitive coupling of the clock signal a 400X
resistor (VREF) is connected internally to the VBB reference
Connecting this resistor to the Clock Pulse input (CP) auto-
matically 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
2 kX resistor with the other end uncommitted (RM1 and
RM2) An M input can be driven from a TTL circuit operating
from the same VCC by connecting the free end of the asso-
ciated 2 kX resistor to VCCA When an M input is driven
from the ECL circuit the 2 kX resistor can be left open or if
required can be connected to VEE to act as a pull-down
resistor
Logic Symbol
Connection Diagram
16-Pin DIP
Pin Names
CE
CP
Mn
MS
QQ
QTTL
RMn
VREF
TL F 9892 – 2
Description
Count Enable Input (Active LOW)
Clock Pulse Input
Count Modulus Control Input
Asynchronous Master Set Input
ECL Outputs
TTL Output
2 kX Resistor to Mn
400X Resistor to VBB
C1995 National Semiconductor Corporation TL F 9892
TL F 9892 – 1
RRD-B30M115 Printed in U S A


National Semiconductor Electronic Components Datasheet

11C90 Datasheet

650 MHz Prescalers

No Preview Available !

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
b65 C to a150 C
Maximum Junction Temperature (TJ)
Supply Voltage Range
a150 C
b7 0V to GND
Input Voltage (DC)
Output Current (DC Output HIGH)
VEE to GND
b50 mA
Operating Range
b5 7V to b4 7V
Lead Temperature
(Soldering 10 sec )
300 C
Recommended Operating
Conditions
Min Typ
Ambient Temperature (TA)
Commercial
0C
Military
b55 C
Supply Voltage (VEE)
Commercial
b5 7V b5 2V
Military
b5 7V b5 2V
Max
a75 C
a125 C
b4 7V
b4 7V
TTL Input Output Operation
DC Electrical Characteristics
Over Operating Temperature and Voltage Range unless otherwise noted Pins 12 and 13 e GND
Symbol
VIH
VIL
VOH
VOL
IIL
ISC
Parameter
Input HIGH Voltage
M1 and M2 Inputs
Input LOW Voltage
M1 and M2 Inputs
Output HIGH Voltage
QTTL Output
Output LOW Voltage
QTTL Output
Input LOW Current
M1 and M2 Inputs
Output Short Circuit
Current
Min
23
b20
Typ
(Note 3)
41
33
33
02
b2 3
b35
Max
05
b5 0
b80
Units
V
V
V
V
mA
mA
Conditions
Guaranteed Input HIGH Threshold
Voltage (Note 4) VCC e VCCA e 5 0V
Guaranteed Input LOW Threshold
Voltage (Note 4) VCC e VCCA e 5 0V
VCC e VCCA e Min
IOH e b640 mA
VCC e VCCA e Min
IOL e 20 0 mA
VCC e VCCA e Max
VIN e 0 4V Pins 6 7 e VCC
VCC e VCCA e Max
VOUT e 0 0V Pin 14 e VCC
AC Electrical Characteristics
VCC e VCCA e 5 0V Nominal VEE e GND TA e a25 C
Symbol
Parameter
Min Typ Max Units
Conditions
tPLH
tPHL
Propagation Delay (50% to 50%)
CP to QTTL
6
10 14
ns See Figure 1
tPLH
Propagation Delay (50% to 50%)
MS to QTTL
12 17
ns
ts Mode Control Setup Time
th Mode Control Hold Time
tTLH Output Rise Time
(20% to 80%)
42
0 b2
10
ns
ns
ns
tTHL Output Fall Time
(80% to 20%)
2 ns
fMAX
Count Frequency
550 650
600 650
MHz
b55 C to a125 C
0 C to a75 C
Clock Input AC Coupled
350 mV Peak-to-Peak
Sinewave (Note 5)
2


Part Number 11C90
Description 650 MHz Prescalers
Maker National
PDF Download

11C90 Datasheet PDF






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