74AUP1Z04GM,115 NXP Semiconductors, 74AUP1Z04GM,115 Datasheet - Page 18

• Manufacturer Part Number: 74AUP1Z04GM,115
• Description: IC XTAL DRIVER LP 6-XSON
• Manufacturer: NXP Semiconductors
• Series: 74AUPr

Specifications of 74AUP1Z04GM,115

• Package / Case: *
• Logic Type: Inverter, X-Tal Driver
• Supply Voltage: 0.8 V ~ 3.6 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of Bits: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 74AUP1Z04GM-G; 74AUP1Z04GM-G; 935280521115

NXP Semiconductors
74AUP1Z04
Product data sheet
Fig 13. Reactance and resistance characteristics of a crystal
(1) resonance
(2) anti-resonance
(3) load resonance
13.1.1 Design
(1)
(2)
(3)
Figure 14
circuit is basically a Pierce oscillator circuit in which the crystal is operating at its
fundamental frequency and is tuned by the parallel load capacitance of C
C
drive-limiting resistor and is set to approximately the same value as the reactance of C
the crystal frequency (R
rail-to-rail output of X2. This keeps the drive level into the crystal within drive
specifications (the designer should verify this). Overdriving the crystal can cause damage.
The internal bias resistor provides negative feedback and sets a bias point of the inverter
near mid-supply, operating the 74AUP1GU04 portion in the high gain linear region.
To calculate the values of C
C
capacitance of the circuit (for the 74AUP1Z04 this is equal to an input capacitance
of 1.5 pF).
2
L
C
are in series with the crystal. They should be approximately equal. R
L
is the load capacitance as specified by the crystal manufacturer, C
C L
=
C
------------------ -
C
1
1
C X0
C X0
C X0
shows the recommended way to connect a crystal to the 74AUP1Z04. This
+
×
C L
C
C
2
2
L X1
R X1
L X1
R X1
L X1
R X1
C X1
C X1
C X1
All information provided in this document is subject to legal disclaimers.
+
C
s
+
+
+
0
0
0
1
Rev. 3 — 22 July 2010
= X
1
C1
and C
Low-power X-tal driver with enable and internal resistor
R
). This will result in an input to the crystal of 50 % of the
1
R
L
2
f
f
, the designer can use the formula:
r
r
f
L
f
L
R
p
f
f
a
a
f
a
resistance
resistance
resistance
reactance
reactance
reactance
001aai362
f
f
f
74AUP1Z04
s
is the stray
© NXP B.V. 2010. All rights reserved.
1
1
is the
and C
2
. C
18 of 28
1
and
1
at