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參數資料
| 型號： | 11C91DCQR |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 650 MHz Prescalers |
| 中文描述： | 650兆赫預分頻器 |
| 文件頁數： | 1/10頁 |
| 文件大小： | 156K |
| 代理商： | 11C91DCQR |
TL/F/9892
1
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 V
CC
and V
EE
levels as the counter,
but a separate pin is used for the TTL circuit V
EE
. This mini-
mizes noise coupling when the TTL output switches and
also allows power consumption to be reduced by leaving
the separate V
EE
pin open if the TTL output is not used.
To facilitate capacitive coupling of the clock signal, a 400
X
resistor (V
REF
) is connected internally to the V
BB
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 k
X
resistor with the other end uncommitted (RM
1
and
RM
2
). An M input can be driven from a TTL circuit operating
from the same V
CC
by connecting the free end of the asso-
ciated 2 k
X
resistor to V
CCA
. When an M input is driven
from the ECL circuit, the 2 k
X
resistor can be left open or, if
required, can be connected to V
EE
to act as a pull-down
resistor.
Logic Symbol
TL/F/9892–2
Pin Names
Description
CE
CP
M
n
MS
Q, Q
QTTL
RM
n
V
REF
Count Enable Input (Active LOW)
Clock Pulse Input
Count Modulus Control Input
Asynchronous Master Set Input
ECL Outputs
TTL Output
2 k
X
Resistor to M
n
400
X
Resistor to V
BB
Connection Diagram
16-Pin DIP
TL/F/9892–1
C
1995 National Semiconductor Corporation
RRD-B30M115/Printed in U. S. A.
相關PDF資料 |
PDF描述 |
|---|---|
| 11C91 | Multiconductor Cable; Number of Conductors:4; Conductor Size AWG:20; No. Strands x Strand Size:26 x 34; Jacket Material:EPDM Rubber; Shielding Material:Tinned Copper; Shielding Coverage:85%; Leaded Process Compatible:Yes RoHS Compliant: Yes |
| 11C91D | Paired Cable; Number of Conductors:5; Conductor Size AWG:20; No. Strands x Strand Size:26 x 34; Jacket Material:Rubber; Features:Tinned Copper Braid; Impedance:52ohm; Temperature Max:90 C; Voltage Nom.:300V RoHS Compliant: Yes |
| 11E1 | DIODE |
| 11E2 | DIODE |
| 11ES2 | DIODE |
相關代理商/技術參數 |
參數描述 |
|---|---|
| 11C91DM | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Prescaler/Frequency Divider |
| 11C91DMQB | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Texas Instruments 功能描述: |
| 11C91DMQB WAF | 制造商:Texas Instruments 功能描述: |
| 11CA11 | 制造商:Tubes 功能描述: |
| 11-CDM2B25-75 | 制造商:SMC Corporation of America 功能描述:Cylinder, round body, 25mm, clean room |
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