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LMX2492RTWR Datasheet(PDF) 6 Page - Texas Instruments

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No. de pieza LMX2492RTWR
Descripción Electrónicos  Low Noise Fractional N PLL
Download  42 Pages
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI1 - Texas Instruments

LMX2492RTWR Datasheet(HTML) 6 Page - Texas Instruments

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tCES
tCS
R/W
A14
A13
tCH
tCWH
tCWL
A0
D7
D1
D0
MSB
LSB
DATA
CLK
LE
tCE
tEWH
A12
A11
LMX2492, LMX2492-Q1
SNAS624B – MARCH 2014 – REVISED MAY 2015
www.ti.com
Electrical Characteristics (continued)
(3.15 V
≤ Vcc ≤ 3.45 V. Vcc ≤Vcp ≤5.25 V. Typical values are at Vcc = Vcp = 3.3 V, 25 °C.
-40°C
≤ TA ≤ 85 °C for the LMX2492 and -40°C ≤ TA ≤ 125 °C for the LMX2492-Q1 ; except as specified.)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNIT
LOGIC OUTPUT TERMINALS (MUXout,TRIG1,TRIG2,MOD)
0.8 x
VOH
Output High Voltage
Vcc
V
Vcc
VOL
Output Low Voltage
0
0.2 x Vcc
V
LOGIC INPUT TERMINALS (CE,CLK,DATA,LE,MUXout,TRIG1,TRIG2,MOD)
VIH
Input High Voltage
1.4
Vcc
V
VIL
Input Low Voltage
0
0.6
V
IIH
Input Leakage
-5
1
5
uA
TCELOW
Chip enable Low Time
5
us
TCEHIGH
Chip enable High Time
5
us
7.7 Timing Requirements, Programming Interface (CLK, DATA, LE)
MIN
NOM
MAX
UNIT
TCE
Clock To LE Low Time
10
ns
TCS
Data to Clock Setup Time
4
ns
TCH
Data to Clock Hold Time
4
ns
TCWH
Clock Pulse Width High
10
ns
TCWL
Clock Pulse Width Low
10
ns
TCES
Enable to Clock Setup Time
10
ns
TEWH
Enable Pulse Width High
10
ns
Figure 1. Serial Data Input Timing
There are several other considerations for programming:
The DATA is clocked into a shift register on each rising edge of the CLK signal. On the rising edge of the LE
signal, the data is sent from the shift register to an actual counter.
If no LE signal is given after the last data bit and the clock is kept toggling, then these bits will be read into
the next lower register. This eliminates the need to send the address each time.
A slew rate of at least 30 V/us is recommended for the CLK, DATA, and LE signals
Timing specifications also apply to readback. Readback can be done through the MUXout, TRIG1, TRIG2, or
MOD terminals.
6
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Copyright © 2014–2015, Texas Instruments Incorporated
Product Folder Links: LMX2492 LMX2492-Q1


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