W91031S Winbond Electronics, W91031S Datasheet - Page 13

• Manufacturer Part Number: W91031S
• Manufacturer: Winbond Electronics

Specifications of W91031S

• Process Technology: CMOS
• Operating Frequency (max): 3580kHz
• Mounting: Surface Mount
• Supply Current: 2.5mA
• Lead Free Status / Rohs Status: Not Compliant

Crystal Oscillator
The operation frequency of the W91031 is 3.579545 MHz. Crystal oscillators, ceramic resonators or
other clock sources can be used. A crystal oscillator or ceramic resonator can be directly connected
to the OSCI and OSCO pins without the need for external components. If other clock sources are
used, the OSCI pin should be driven by a clock source and the OSCO pin used to drive other external
clocked devices, or left open. Figure 7-9 shows some applications.
The crystal specification is as follows:
Bias Voltage Generator
The bias voltage generator provides a low impedance voltage source equal to V
bias the gain control op-amp. The voltage source is also used for internal circuits. A 0.1 F capacitor
should be placed between the VREF pin and V
Frequency:
Frequency tolerance:
Resonance mode:
Load capacitance:
Maximum series resistance: 150
Maximum drive level (mV):
3 . 5 7 9 5 4 5 M H z
( a ) W i t h c r y s t a l o s s c i l l a t o r o r c e r a m ic
( b ) W i t h o t h e r c l o c k
O s c i l l a t o r
O S C O
Figure 7-9. Some Application of Clock Driven Circuit
O S C I
3.579545 MHz
+/- 0.1 % (-40 C to +85 C)
Parallel
18 pF
2 mV
W 9 1 0 3 1
O S C O
3 . 5 7 9 5 4 5 M H z
O S C I
W 9 1 0 3 1
SS
- 13 -
O S C O
to reduce noise.
O S C I
W 9 1 0 3 1
O S C O
Publication Release Date: August 2000
Preliminary W91031
O S C I
W 9 1 0 3 1
O S C O
DD
/2 and is used to
Revision A1